58 results on '"Wallace KJ"'
Search Results
2. Upper extremity orthopedic softball injuries presenting to the emergency department: epidemiology across the lifespan.
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Painter DF, Ahn BJ, Byrne RA, Dove JH, Wallace KJ, Jain R, and Owens BD
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- Humans, Male, Female, Adult, Adolescent, United States epidemiology, Middle Aged, Incidence, Child, Aged, Young Adult, Aged, 80 and over, Emergency Service, Hospital statistics & numerical data, Athletic Injuries epidemiology, Baseball injuries, Upper Extremity injuries
- Abstract
Background: Softball is a popular lifetime sport due to its inclusion of both fastpitch and slowpitch varieties, although associated injuries are common., Objective: To compare softball injury rates across patient sex, age, race, injury location, mechanism, and activity., Methods: The National Electronic Injury Surveillance System (NEISS) was queried for all upper extremity softball injuries in patients 10-85+ years old presenting to United States emergency departments between 2012 and 2021., Results: Significantly more of the 178,303 total weighted upper extremity injuries occurred in female (68.1%) than male (31.9%) athletes ( p < .001). Male patients (mean 34.9 ± 13.6 years) were older than female patients (17.4 ± 8.4; p = .019). The average incidence rate of UE injuries from 2012-2021 was 187.9 per 100,000 persons, with a significant decrease in injury incidence across the timespan ( p < .001). The lowest annual injury incidence (74.7 per 100,000 persons) occurred in 2020. In patients 10-18 years old, female patients accounted for 95.1% of all injuries, whereas male patients accounted for 72.1% of all injuries in patients aged ≥23. Compared to male patients, females more frequently experienced hand ( p < .001), lower arm ( p = .007), shoulder ( p < .001), and wrist ( p < .001) injuries in patients 10-18 years old, finger ( p < .001), upper arm ( p = .016), and wrist ( p < .001) injuries in patients 19-22, and finger injuries ( p < .001) in patients aged 23 +. Across all ages, the greatest proportion of injuries were treated and released ( p < .001). Most injuries occurred while fielding (41.8%) and due to player-ball contact (36.8%)., Conclusion: Softball injury ED presentations declined across a decade, including a precipitous drop and rebound effect due to the COVID-19 pandemic. Across the lifespan, upper extremity injuries progressively shifted from female-predominant in younger athletes to male-predominant in adults.
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- 2025
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3. An Integrative Brain and Behavior CURE (Course-Based Undergraduate Research Experience) Using Immunohistochemistry in the Fighting Fish Betta splendens .
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Crescencio GA, Femi-Jegede OD, Zhang J, Aquino Vasquez EA, and Wallace KJ
- Abstract
Course-based undergraduate research experiences (CUREs) provide a variety of benefits to student learning outcomes. Here we describe an upper-level semester-long CURE that was implemented in Spring 2024 at Amherst College, a small liberal arts college, as part of the NEUR 313: Social Neuroendocrinology course. In the CURE students conducted behavioral and immunohistochemical assays in the fighting fish Betta splendens . Students assessed whether behavioral and neural response differed between fish exposed to social and nonsocial stimuli. The CURE exposed students to a suite of behavioral, wet lab, and data analysis techniques. In addition to completing weekly lab primers, the students' research efforts culminated in a final written paper and oral presentation where students integrated both mechanistic and eco-evolutionary thinking. The CURE was very positively reviewed by the students, and future iterations of the CURE can be easily modified to fit new research topics that further explore biological questions through a neuroethological lens., (Copyright © 2024 Faculty for Undergraduate Neuroscience.)
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- 2024
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4. Bioenergetic mapping of 'healthy microbiomes' via compound processing potential imprinted in gut and soil metagenomes.
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Liddicoat C, Edwards RA, Roach M, Robinson JM, Wallace KJ, Barnes AD, Brame J, Heintz-Buschart A, Cavagnaro TR, Dinsdale EA, Doane MP, Eisenhauer N, Mitchell G, Rai B, Ramesh SA, and Breed MF
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- Humans, Microbiota, Energy Metabolism, Soil chemistry, Soil Microbiology, Gastrointestinal Microbiome, Metagenome
- Abstract
Despite mounting evidence of their importance in human health and ecosystem functioning, the definition and measurement of 'healthy microbiomes' remain unclear. More advanced knowledge exists on health associations for compounds used or produced by microbes. Environmental microbiome exposures (especially via soils) also help shape, and may supplement, the functional capacity of human microbiomes. Given the synchronous interaction between microbes, their feedstocks, and micro-environments, with functional genes facilitating chemical transformations, our objective was to examine microbiomes in terms of their capacity to process compounds relevant to human health. Here we integrate functional genomics and biochemistry frameworks to derive new quantitative measures of in silico potential for human gut and environmental soil metagenomes to process a panel of major compound classes (e.g., lipids, carbohydrates) and selected biomolecules (e.g., vitamins, short-chain fatty acids) linked to human health. Metagenome functional potential profile data were translated into a universal compound mapping 'landscape' based on bioenergetic van Krevelen mapping of function-level meta-compounds and corresponding functional relative abundances, reflecting imprinted genetic capacity of microbiomes to metabolize an array of different compounds. We show that measures of 'compound processing potential' associated with human health and disease (examining atherosclerotic cardiovascular disease, colorectal cancer, type 2 diabetes and anxious-depressive behavior case studies), and displayed seemingly predictable shifts along gradients of ecological disturbance in plant-soil ecosystems (three case studies). Ecosystem quality explained 60-92 % of variation in soil metagenome compound processing potential measures in a post-mining restoration case study dataset. With growing knowledge of the varying proficiency of environmental microbiota to process human health associated compounds, we might design environmental interventions or nature prescriptions to modulate our exposures, thereby advancing microbiota-oriented approaches to human health. Compound processing potential offers a simplified, integrative approach for applying metagenomics in ongoing efforts to understand and quantify the role of microbiota in environmental- and human-health., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
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- 2024
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5. Longitudinal cytokine and multi-modal health data of an extremely severe ME/CFS patient with HSD reveals insights into immunopathology, and disease severity.
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Jahanbani F, Sing JC, Maynard RD, Jahanbani S, Dafoe J, Dafoe W, Jones N, Wallace KJ, Rastan A, Maecker HT, Röst HL, Snyder MP, and Davis RW
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- Adult, Humans, Male, Cytokines metabolism, Severity of Illness Index
- Abstract
Introduction: Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) presents substantial challenges in patient care due to its intricate multisystem nature, comorbidities, and global prevalence. The heterogeneity among patient populations, coupled with the absence of FDA-approved diagnostics and therapeutics, further complicates research into disease etiology and patient managment. Integrating longitudinal multi-omics data with clinical, health,textual, pharmaceutical, and nutraceutical data offers a promising avenue to address these complexities, aiding in the identification of underlying causes and providing insights into effective therapeutics and diagnostic strategies., Methods: This study focused on an exceptionally severe ME/CFS patient with hypermobility spectrum disorder (HSD) during a period of marginal symptom improvements. Longitudinal cytokine profiling was conducted alongside the collection of extensive multi-modal health data to explore the dynamic nature of symptoms, severity, triggers, and modifying factors. Additionally, an updated severity assessment platform and two applications, ME-CFSTrackerApp and LexiTime, were introduced to facilitate real-time symptom tracking and enhance patient-physician/researcher communication, and evaluate response to medical intervention., Results: Longitudinal cytokine profiling revealed the significance of Th2-type cytokines and highlighted synergistic activities between mast cells and eosinophils, skewing Th1 toward Th2 immune responses in ME/CFS pathogenesis, particularly in cognitive impairment and sensorial intolerance. This suggests a potentially shared underlying mechanism with major ME/CFS comorbidities such as HSD, Mast cell activation syndrome, postural orthostatic tachycardia syndrome (POTS), and small fiber neuropathy. Additionally, the data identified potential roles of BCL6 and TP53 pathways in ME/CFS etiology and emphasized the importance of investigating adverse reactions to medication and supplements and drug interactions in ME/CFS severity and progression., Discussion: Our study advocates for the integration of longitudinal multi-omics with multi-modal health data and artificial intelligence (AI) techniques to better understand ME/CFS and its major comorbidities. These findings highlight the significance of dysregulated Th2-type cytokines in patient stratification and precision medicine strategies. Additionally, our results suggest exploring the use of low-dose drugs with partial agonist activity as a potential avenue for ME/CFS treatment. This comprehensive approach emphasizes the importance of adopting a patient-centered care approach to improve ME/CFS healthcare management, disease severity assessment, and personalized medicine. Overall, these findings contribute to our understanding of ME/CFS and offer avenues for future research and clinical practice., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Jahanbani, Sing, Maynard, Jahanbani, Dafoe, Dafoe, Jones, Wallace, Rastan, Maecker, Röst, Snyder and Davis.)
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- 2024
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6. Convergence and divergence in science and practice of urban and rural forest restoration.
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Romanelli JP, Piana MR, Klaus VH, Brancalion PHS, Murcia C, Cardou F, Wallace KJ, Adams C, Martin PA, Burton PJ, Diefenderfer HL, Gornish ES, Stanturf J, Beyene M, Santos JPB, Rodrigues RR, and Cadotte MW
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- Trees, Rivers, Ecosystem, Forests, Conservation of Natural Resources
- Abstract
Forest restoration has never been higher on policymakers' agendas. Complex and multi-dimensional arrangements across the urban-rural continuum challenge restorationists and require integrative approaches to strengthen environmental protection and increase restoration outcomes. It remains unclear if urban and rural forest restoration are moving towards or away from each other in practice and research, and whether comparing research outcomes can help stakeholders to gain a clearer understanding of the interconnectedness between the two fields. This study aims to identify the challenges and opportunities for enhancing forest restoration in both urban and rural systems by reviewing the scientific evidence, engaging with key stakeholders and using an urban-rural forest restoration framework. Using the Society for Ecological Restoration's International Principles as discussion topics, we highlight aspects of convergence and divergence between the two fields to broaden our understanding of forest restoration and promote integrative management approaches to address future forest conditions. Our findings reveal that urban and rural forest restoration have convergent and divergent aspects. We emphasise the importance of tailoring goals and objectives to specific contexts and the need to design different institutions and incentives based on the social and ecological needs and goals of stakeholders in different regions. Additionally, we discuss the challenges of achieving high levels of ecological restoration and the need to go beyond traditional ecology to plan, implement, monitor, and adaptively manage restored forests. We suggest that rivers and watersheds could serve as a common ground linking rural and urban landscapes and that forest restoration could interact with other environmental protection measures. We note the potential for expanding the creative vision associated with increasing tree-containing environments in cities to generate more diverse and resilient forest restoration outcomes in rural settings. This study underscores the value of integrative management approaches in addressing future forest conditions across the urban-rural continuum. Our framework provides valuable insights for policymakers, researchers, and decision-makers to advance the field of forest restoration and address the challenges of restoration across the urban-rural continuum. The rural-urban interface serves as a convergence point for forest restoration, and both urban and rural fields can benefit from each other's expertise., (© 2023 Cambridge Philosophical Society.)
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- 2024
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7. Early life social complexity shapes adult neural processing in the communal spiny mouse Acomys cahirinus.
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Wallace KJ, Dupeyron S, Li M, and Kelly AM
- Abstract
Rationale: Early life social rearing has profound consequences on offspring behavior and resilience. Yet, most studies examining early life development in rodents use species whose young are born immobile and do not produce complex social behavior until later in development. Furthermore, models of rearing under increased social complexity, rather than deprivation, are needed to provide alternative insight into the development of social neural circuitry., Objectives: To understand precocial offspring social development, we manipulated early life social complexity in the communal spiny mouse Acomys cahirinus and assessed long-term consequences on offspring social behavior, exploration, and neural responses to novel social stimuli., Methods: Spiny mouse pups were raised in the presence or absence of a non-kin breeding group. Upon adulthood, subjects underwent social interaction tests, an open field test, and a novel object test. Subjects were then exposed to a novel conspecific and novel group and neural responses were quantified via immunohistochemical staining in brain regions associated with social behavior., Results: Early life social experience did not influence behavior in the test battery, but it did influence social processing. In animals exposed to non-kin during development, adult lateral septal neural responses toward a novel conspecific were weaker and hypothalamic neural responses toward a mixed-sex group were stronger., Conclusions: Communal species may exhibit robust behavioral resilience to the early life social environment. But the early life environment can affect how novel social information is processed in the brain during adulthood, with long-term consequences that are likely to shape their behavioral trajectory., (© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
- Published
- 2023
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8. A molecular chemodosimeter to probe "closed shell" ions in kidney cells.
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Assel A, Stanley MM, Mia R, Boulila B, Cragg PJ, Owolabie I, Hetrick M, Flynt A, Wallace KJ, and Ben Jannet H
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- Humans, HEK293 Cells, Ions, Cations, HeLa Cells, Fluorescent Dyes, Metals, Mercury
- Abstract
Two quinidine-functionalized coumarin molecular probes have been synthesized and have been found to bind metal cations (Cd
2+ , Co2+ , Cu2+ , Fe2+ , Hg2+ , Ni2+ , and Zn2+ ) with high affinity in organic-aqueous media (DMSO-HEPES). The chemodosimeters coordinate with the Zn2+ ions in a two-to-one ratio (molecular probe : Zn2+ ) with a log β of 10.0 M-2 . Upon the addition of the closed-shell metal ions studied, a fluorescence turn-on via an excimer formation is seen at 542 nm due to the quinaldine moiety adopting a syn arrangement when coordinated to the metal Zn2+ ions. Confocal microscopy monitored free Zn2+ ions in the Human Embryonic Kidney cell line HEK293 by coordinating with the chemodosimter.- Published
- 2023
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9. A test of the social behavior network reveals differential patterns of neural responses to social novelty in bonded, but not non-bonded, male prairie voles.
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Wallace KJ, Chun EK, Manns JR, Ophir AG, and Kelly AM
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- Male, Female, Humans, Animals, Arvicolinae physiology, Pair Bond, Grassland, Social Behavior
- Abstract
The social behavior network (SBN) has provided a framework for understanding the neural control of social behavior. The original SBN hypothesis proposed this network modulates social behavior and should exhibit distinct patterns of neural activity across nodes, which correspond to distinct social contexts. Despite its tremendous impact on the field of social neuroscience, no study has directly tested this hypothesis. Thus, we assessed Fos responses across the SBN of male prairie voles (Microtus ochrogaster). Virgin/non-bonded and pair bonded subjects were exposed to a sibling cagemate or pair bonded partner, novel female, novel male, novel meadow vole, novel object, or no stimulus. Inconsistent with the original SBN hypothesis, we did not find profoundly different patterns of neural responses across the SBN for different contexts, but instead found that the SBN generated significantly different patterns of activity in response to social novelty in pair bonded, but not non-bonded males. These findings suggest that non-bonded male prairie voles may perceive social novelty differently from pair bonded males or that SBN functionality undergoes substantial changes after pair bonding. This study reveals novel information about bond-dependent, context-specific neural responsivity in male prairie voles and suggests that the SBN may be particularly important for processing social salience. Further, our study suggests there is a need to reconceptualize the framework of how the SBN modulates social behavior., (Copyright © 2023 Elsevier Inc. All rights reserved.)
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- 2023
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10. Leveraging individual power to improve racial equity in academia.
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Monari PK, Hammond ER, Malone CL, Cuarenta A, Hiura LC, Wallace KJ, Taylor L, and Pradhan DS
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- United States, Diversity, Equity, Inclusion, Universities
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Academia in the United States continues to grapple with its longstanding history of racial discrimination and its active perpetuation of racial disparities. To this end, universities and academic societies must grow in ways that reduce racial minoritization and foster racial equity. What are the effective and long-lasting approaches we as academics should prioritize to promote racial equity in our academic communities? To address this, the authors held a diversity, equity, and inclusion (DEI) panel during the Society for Behavioral Neuroendocrinology 2022 annual meeting, and in the following commentary synthesize the panelists' recommendations for fostering racial equity in the US academic community., (Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
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- 2023
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11. Distribution of vasopressin 1a and oxytocin receptor protein and mRNA in the basal forebrain and midbrain of the spiny mouse (Acomys cahirinus).
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Powell JM, Inoue K, Wallace KJ, Seifert AW, Young LJ, and Kelly AM
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- Animals, Female, Male, RNA, Messenger metabolism, Mesencephalon metabolism, Oxytocin, Receptors, Vasopressin genetics, Receptors, Vasopressin metabolism, Vasopressins metabolism, Social Behavior, Murinae genetics, Murinae metabolism, Receptors, Oxytocin genetics, Basal Forebrain metabolism
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The nonapeptide system modulates numerous social behaviors through oxytocin and vasopressin activation of the oxytocin receptor (OXTR) and vasopressin receptor (AVPR1A) in the brain. OXTRs and AVPR1As are widely distributed throughout the brain and binding densities exhibit substantial variation within and across species. Although OXTR and AVPR1A binding distributions have been mapped for several rodents, this system has yet to be characterized in the spiny mouse (Acomys cahirinus). Here we conducted receptor autoradiography and in situ hybridization to map distributions of OXTR and AVPR1A binding and Oxtr and Avpr1a mRNA expression throughout the basal forebrain and midbrain of male and female spiny mice. We found that nonapeptide receptor mRNA is diffuse throughout the forebrain and midbrain and does not always align with OXTR and AVPR1A binding. Analyses of sex differences in brain regions involved in social behavior and reward revealed that males exhibit higher OXTR binding densities in the lateral septum, bed nucleus of the stria terminalis, and anterior hypothalamus. However, no association with gonadal sex was observed for AVPR1A binding. Hierarchical clustering analysis further revealed that co-expression patterns of OXTR and AVPR1A binding across brain regions involved in social behavior and reward differ between males and females. These findings provide mapping distributions and sex differences in nonapeptide receptors in spiny mice. Spiny mice are an excellent organism for studying grouping behaviors such as cooperation and prosociality, and the nonapeptide receptor mapping here can inform the study of nonapeptide-mediated behavior in a highly social, large group-living rodent., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
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- 2023
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12. A DUAL MTOR/NAD+ ACTING GEROTHERAPY.
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Li J, Kumar S, Miachin K, Bean NL, Halawi O, Lee S, Park J, Pierre TH, Hor JH, Ng SY, Wallace KJ, Rindtorff N, Miller TM, Niehoff ML, Farr SA, Kletzien RF, Colca J, Tanis SP, Chen Y, Griffett K, McCommis KS, Finck BN, and Peterson TR
- Abstract
The geroscience hypothesis states that a therapy that prevents the underlying aging process should prevent multiple aging related diseases. The mTOR (mechanistic target of rapamycin)/insulin and NAD+ (nicotinamide adenine dinucleotide) pathways are two of the most validated aging pathways. Yet, it's largely unclear how they might talk to each other in aging. In genome-wide CRISPRa screening with a novel class of N-O-Methyl-propanamide-containing compounds we named BIOIO-1001, we identified lipid metabolism centering on SIRT3 as a point of intersection of the mTOR/insulin and NAD+ pathways. In vivo testing indicated that BIOIO-1001 reduced high fat, high sugar diet-induced metabolic derangements, inflammation, and fibrosis, each being characteristic of non-alcoholic steatohepatitis (NASH). An unbiased screen of patient datasets suggested a potential link between the anti-inflammatory and anti-fibrotic effects of BIOIO-1001 in NASH models to those in amyotrophic lateral sclerosis (ALS). Directed experiments subsequently determined that BIOIO-1001 was protective in both sporadic and familial ALS models. Both NASH and ALS have no treatments and suffer from a lack of convenient biomarkers to monitor therapeutic efficacy. A potential strength in considering BIOIO-1001 as a therapy is that the blood biomarker that it modulates, namely plasma triglycerides, can be conveniently used to screen patients for responders. More conceptually, to our knowledge BIOIO-1001 is a first therapy that fits the geroscience hypothesis by acting on multiple core aging pathways and that can alleviate multiple conditions after they have set in., Competing Interests: CONFLICT OF INTERESTS T.R.P. is the founder of BIOIO, a St. Louis-based biotech company specializing in drug target identification. BIOIO-1001 and related compounds are BIOIO assets. Conflicts of interest for T.M.M. are Ionis, licensing agreement; Consulting for Ionis, Biogen, Cytokinetics, Disarm Therapeutics, BIOIO; UCB, advisory board; Honorarium for Regeneron and Denali.
- Published
- 2023
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13. Protocol for multiplex fluorescent immunohistochemistry in free-floating rodent brain tissues.
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Kelly AM, Fricker BA, and Wallace KJ
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- Immunohistochemistry, Brain, Fluorescent Dyes, Antibodies
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Identifying multiple proteins within the same tissue allows for assessing protein colocalization, is cost effective, and maximizes efficiency. Here, we describe a protocol for multiplex immunolabeling of proteins in free-floating rodent brain sections. As opposed to slide-mounted immunohistochemistry, the free-floating approach results in less tissue loss and greater antibody penetration. Using distinct fluorophores for individual proteins, this protocol allows for visualization of three or more proteins within tissue sections. The protocol can be applied to other tissue types. For complete details on the use and execution of this protocol, please refer to Gonzalez Abreu et al. (2022)., Competing Interests: Declaration of interests The authors declare no competing interests., (Copyright © 2022 The Author(s). Published by Elsevier Inc. All rights reserved.)
- Published
- 2022
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14. The effect of outer-sphere anions on the spectroscopic response of metal-binding chemosensors.
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Ihde MH, Covey G, Johnson ADG, Fronczek FR, Wallace KJ, and Bonizzoni M
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- Anions chemistry, Cations, Ligands, Rhodamines, Metals chemistry
- Abstract
Ion pair receptors typically contain two separate binding sites, for the metal and the anion respectively. Here we report a less synthetically demanding approach, whereby we prepared a family of ion pair sensors based on a rhodamine fluorescent scaffold containing a tunable cation binding motif. When exposed to ion pairs, a competition for the metal ion is established between these ligands and anions. Structural and spectroscopic evidence showed that anions bind through weaker secondary interactions in the metal's outer coordination sphere and their presence influences the optical spectroscopic properties of the coordination complex in distinctive ways. The relationship between the binding site's metal affinity and its tunable properties, and the sensors' discriminatory power for anions was explained as a function of the metal ion's binding preferences. These effects were also exploited to discriminate cations and anions concurrently through multivariate data analysis methods.
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- 2022
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15. Tackling communication and analytical problems in environmental planning: Expert assessment of key definitions and their relationships.
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Wallace KJ, Wagner C, Pannell DJ, Kim MK, and Rogers AA
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- Communication, Humans, Terminology as Topic, Environment, Planning Techniques
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Inadequate definition of key terms and their relationships generates significant communication and analytical problems in environmental planning. In this work, we evaluate an ontological framework for environmental planning designed to combat these problems. After outlining the framework and issues addressed, we describe its evaluation by a group of experts representing a range of expertise and institutions. Experts rated their level of agreement with 12 propositions concerning the definitions and models underpinning the framework. These propositions, in turn, were used to assess three assumptions regarding the expected effectiveness of the framework and its contribution to addressing the abovementioned planning problems. In addition to point-based best estimates of their agreement with propositions, expert ratings were also captured on a continuous interval-valued scale. The use of intervals addresses the challenge of measuring and modelling uncertainty associated with complex assessments such as those provided by experts. Combined with written anonymous expert comments, these data provide multiple perspectives on the level of support for the approach. We conclude that the framework can complement existing planning approaches and strengthen key definitions and related models, thus helping avoid communication and analytical problems in environmental planning. Finally, experts highlighted areas that require further development, and we provide recommendations for improving the framework., (Copyright © 2022 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2022
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16. Species-typical group size differentially influences social reward neural circuitry during nonreproductive social interactions.
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Gonzalez Abreu JA, Rosenberg AE, Fricker BA, Wallace KJ, Seifert AW, and Kelly AM
- Abstract
We investigated whether nonreproductive social interactions may be rewarding for colonial but not non-colonial species. We found that the colonial spiny mouse ( Acomys cahirinus ) is significantly more gregarious, more prosocial, and less aggressive than its non-colonial relative, the Mongolian gerbil ( Meriones unguiculatus ). In an immediate-early gene study, we examined oxytocin (OT) and tyrosine hydroxylase (TH) neural responses to interactions with a novel, same-sex conspecific or a novel object. The paraventricular nucleus of the hypothalamus (PVN) OT cell group was more responsive to interactions with a conspecific compared to a novel object in both species. However, the ventral tegmental area (VTA) TH cell group showed differential responses only in spiny mice. Further, PVN OT and VTA TH neural responses positively correlated in spiny mice, suggesting functional connectivity. These results suggest that colonial species may have evolved neural mechanisms associated with reward in novel, nonreproductive social contexts to promote large group-living., Competing Interests: The authors declare no competing interests., (© 2022 The Author(s).)
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- 2022
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17. Social ascent changes cognition, behaviour and physiology in a highly social cichlid fish.
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Wallace KJ, Choudhary KD, Kutty LA, Le DH, Lee MT, Wu K, and Hofmann HA
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- Animals, Cognition, Hierarchy, Social, Hydrocortisone, Male, Social Dominance, Cichlids physiology
- Abstract
When an individual ascends in dominance status within their social community, they often undergo a suite of behavioural, physiological and neuromolecular changes. While these changes have been extensively characterized across a number of species, we know much less about the degree to which these changes in turn influence cognitive processes like associative learning, memory and spatial navigation. Here, we assessed male Astatotilapia burtoni , an African cichlid fish known for its dynamic social dominance hierarchies, in a set of cognitive tasks both before and after a community perturbation in which some individuals ascended in dominance status. We assayed steroid hormone (cortisol, testosterone) levels before and after the community experienced a social perturbation. We found that ascending males changed their physiology and novel object recognition preference during the perturbation, and they subsequently differed in social competence from non-ascenders. Additionally, using a principal component analysis we were able to identify specific cognitive and physiological attributes that appear to predispose certain individuals to ascend in social status once a perturbation occurs. These previously undiscovered relationships between social ascent and cognition further emphasize the broad influence of social dominance on animal decision-making. This article is part of the theme issue 'The centennial of the pecking order: current state and future prospects for the study of dominance hierarchies'.
- Published
- 2022
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18. Structural Features of a Family of Coumarin-Enamine Fluorescent Chemodosimeters for Ion Pairs.
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Davis AB, Ihde MH, Busenlehner AM, Davis DL, Mia R, Panella J, Fronczek FR, Bonizzoni M, and Wallace KJ
- Abstract
A family of coumarin-enamine chemodosimeters is evaluated for their potential use as fluorescent molecular probes for multiple analytes [cadmium(II), cobalt(II), copper(II), iron(II), nickel(II), lead(II), and zinc(II)], as their chloride and acetate salts. These fluorophores displayed excellent optical spectroscopic modulation when exposed to ion pairs with different Lewis acidic and basic properties in dimethyl sulfoxide (DMSO). The chemodosimeters were designed to undergo excited-state intramolecular proton transfer (ESIPT), which leads to significant Stokes shifts (ca. 225 nm) and lower-energy fluorescence emission (ca. 575 nm). A more basic anion, e.g., acetate, inhibited the ESIPT mechanism by deprotonation of the enol, producing a binding pocket (N^O
- chelate) that can coordinate to an appropriate metal ion. Coordination of the metal ions enhances the fluorescent intensity via the chelation-enhanced fluorescence emission mechanism. Subjecting the spectroscopic data to linear discriminant analysis provided insights into the source of these systems' markedly different behavior toward ion pairs, despite the subtle structural differences in the organic framework. These compounds are examples of versatile, low-molecular-weight, dual-channel fluorescent sensors for ion-pair recognition. This study paves the way for using these probes as practical components of a sensing array for different metal ions and their respective anions.- Published
- 2021
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19. Equal performance but distinct behaviors: sex differences in a novel object recognition task and spatial maze in a highly social cichlid fish.
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Wallace KJ and Hofmann HA
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- Animals, Cognition, Exploratory Behavior, Female, Male, Visual Perception, Cichlids, Sex Characteristics
- Abstract
Sex differences in behavior and cognition can be driven by differential selection pressures from the environment and in the underlying neuromolecular mechanisms of decision-making. The highly social cichlid fish Astatotilapia burtoni exhibits dynamic and complex social hierarchies, yet explicit cognitive testing (outside of social contexts) and investigations of sex differences in cognition have yet to be fully explored. Here we assessed male and female A. burtoni in two cognitive tasks: a novel object recognition task and a spatial task. We hypothesized that males outperform females in a spatial learning task and exhibit more neophilic/exploratory behavior across both tasks. In the present study we find that both sexes prefer the familiar object in a novel object recognition task, but the time at which they exhibit this preference differs between the sexes. Females more frequently learned the spatial task, exhibiting longer decision latencies and quicker error correction, suggesting a potential speed-accuracy tradeoff. Furthermore, the sexes differ in space use in both tasks and in a principal component analysis of the spatial task. A model selection analysis finds that preference, approach, and interaction duration in the novel object recognition task reach a threshold of importance averaged across all models. This work highlights the need to explicitly test for sex differences in cognition to better understand how individuals navigate dynamic social environments., (© 2021. This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.)
- Published
- 2021
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20. Decision-making in a social world: Integrating cognitive ecology and social neuroscience.
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Wallace KJ and Hofmann HA
- Subjects
- Animals, Brain, Cognition, Decision Making, Social Behavior, Cognitive Neuroscience
- Abstract
Understanding animal decision-making involves simultaneously dissecting and reconstructing processes across levels of biological organization, such as behavior, physiology, and brain function, as well as considering the environment in which decisions are made. Over the past few decades, foundational breakthroughs originating from a variety of model systems and disciplines have painted an increasingly comprehensive picture of how individuals sense information, process it, and subsequently modify behavior or states. Still, our understanding of decision-making in social contexts is far from complete and requires integrating novel approaches and perspectives. The fields of social neuroscience and cognitive ecology have approached social decision-making from orthogonal perspectives. The integration of these perspectives (and fields) is critical in developing comprehensive and testable theories of the brain., Competing Interests: Conflict of interest statement Nothing declared., (Copyright © 2021 Elsevier Ltd. All rights reserved.)
- Published
- 2021
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21. Wellbeing, values, and planning in environmental management.
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Wallace KJ, Jago M, Pannell DJ, and Kim MK
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- Humans, Conservation of Natural Resources, Decision Making
- Abstract
Concepts of 'human values' and 'wellbeing' are central in environmental planning, especially during the group deliberations that underpin expert and participatory processes. However, there are long-standing, unresolved controversies concerning both concepts with many debates being highly theoretical. Therefore, we suggest it is more productive to develop definitions and models that are task-specific (mid-level theory). To this end, we use purpose-built value sets and models to explain the relationships among values and wellbeing, and to demarcate values, desires, and personality. The derived concepts are designed for group deliberations and could readily be combined with existing decision support tools, such as structured decision making. Outputs from the work also inform current debates within the environmental domain including, for example, those surrounding the intrinsic value of nature, and ideas concerning plural values versus a single overarching value (monism). We also define 'wellbeing' as an evaluative statement that supports assessments of trade-offs and co-benefits., (Copyright © 2020 Elsevier Ltd. All rights reserved.)
- Published
- 2021
- Full Text
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22. A systems change framework for evaluating academic equity and inclusion in an Ecology and Evolution Graduate Program.
- Author
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Wallace KJ and York JM
- Abstract
While academia is moving forward in terms of diversifying recruitment of undergraduate and graduate students, diverse representation is still not found across the academic hierarchy. At the graduate level, new discussions are emerging around efforts to improve the experiences of women and underrepresented minorities through inclusive graduate programming. Inclusive graduate programs are that which actively center and prioritize support for diverse experiences, identities, career goals, and perspectives, from recruitment through graduation. Establishing regular and rigorous evaluation of equity and inclusion efforts and needs is a critical component of this work. This is recognized by funding agencies that increasingly require reporting on inclusion efforts; here, we suggest use of a systems change framework for these evaluations. A systems change approach emphasizes three levels: explicit change (e.g., policies), semi-explicit change (e.g., power dynamics), and implicit change (e.g., biases). We use the Ecology, Evolution, and Behavior (EEB) PhD Program at the University of Texas at Austin in an exercise to (a) identify areas of concern regarding inclusive programming voiced by graduate students, (b) categorize efforts to address these concerns, and (c) integrating and evaluating which areas of the systems change framework show the greatest progress or potential for progress. We argue this framework is particularly useful for academic systems as they are complex, composed of variable individuals, and must address diverse stakeholder needs., Competing Interests: The authors declare no competing interests., (© 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
- Published
- 2020
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23. Sex differences in cognitive performance and style across domains in mosquitofish (Gambusia affinis).
- Author
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Wallace KJ, Rausch RT, Ramsey ME, and Cummings ME
- Subjects
- Animals, Cognition, Female, Learning, Male, Personality, Cyprinodontiformes, Sex Characteristics
- Abstract
Given that the sexes often differ in their ecological and sexual selection pressures, sex differences in cognitive properties are likely. While research on sexually dimorphic cognition often focuses on performance, it commonly overlooks how sexes diverge across cognitive domains and in behaviors exhibited during a cognitive task (cognitive style). We tested male and female western mosquitofish (Gambusia affinis) in three cognitive tasks: associative learning (numerical discrimination), cognitive flexibility (detour task), and spatio-temporal learning (shuttlebox). We characterized statistical relationships between cognitive performances and cognitive style during the associative learning task with measures of anxiety, boldness, exploration, reaction time, and activity. We found sex differences in performance, cognitive style, and the relationships between cognitive domains. Females outperformed males in the spatio-temporal learning task, while the sexes performed equally in associate learning and cognitive flexibility assays. Females (but not males) exhibited a 'fast-exploratory' cognitive style during associative learning trials. Meanwhile, only males showed a significant positive relationship between domains (associative learning and cognitive flexibility). We propose that these sexually dimorphic cognitive traits result from strong sexual conflict in this taxon; and emphasize the need to explore suites of sex-specific cognitive traits and broader comparative work examining sexual selection and cognition.
- Published
- 2020
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24. Classifying human wellbeing values for planning the conservation and use of natural resources.
- Author
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Wallace KJ, Kim MK, Rogers A, and Jago M
- Subjects
- Humans, Conservation of Natural Resources, Natural Resources
- Abstract
Understanding how values interact is fundamental to planning the conservation and use of natural resources. However, practitioners who apply value classifications use a diversity of approaches. Does this matter? In answering this question, we propose that well-constructed classifications contribute to planning by: clarifying definitions and underlying concepts; providing a basis for assessing synergies and trade-offs; explaining some ethical constraints, including aspects of governance and power; and providing a framework for cross-cultural analysis. To test these propositions we develop complementary value classifications for end state values and principles together with supporting theory, assumptions, and criteria. The proposed classifications are then compared with alternatives including those based on 'needs', 'capabilities', and total economic value. We find that the alternatives fail against key criteria and this hampers their capacity to fulfil the four roles proposed above. Therefore, we conclude that although value classifications are important and may vary depending on purpose, they need to be well-constructed - that is, supporting theory, assumptions, and criteria should be explicit., (Copyright © 2019 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2020
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25. Binding of Mono- and Dianions within Silver Thiazolylurea Tweezers and Capsules.
- Author
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Lee NTX, Hicks J, Wallace KJ, and Turner DR
- Abstract
A silver thiazolylurea complex, [Ag(TUTh)
2 ]+ , has been used as a host species for geometrically differently shaped mono- and dianions: trigonal planar (NO3 - ), tetrahedral (SO4 2- ), and octahedral (SiF6 2- ). In the presence of nitrate a 1:1 near-planar tweezer host-guest species is formed, with poor binding in solution despite excellent geometric complementarity being found between the host and the anion in the solid state. In the presence of either SO4 2- or SiF6 2- a 2:1 host-guest species is formed, whereby the guest is held in a capsulelike arrangement stabilized by an array of eight NH hydrogen-bond donors, as confirmed by X-ray crystallographic studies. Solution studies in DMSO-d6 support the host-guest stoichiometry seen in the solid state. The binding constant between SO4 2- and [Ag(TUTh)2 ]+ was calculated to be K21 = 2511 M-2 and was shown to be the dominant species in solution, in excellent agreement with the solid-state studies. However, upon the addition of SiF6 2- ions different speciation is observed: H2 ·G (capsule), H·G (tweezer), and H·G2 during the course of the study.- Published
- 2017
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26. Category mistakes: A barrier to effective environmental management.
- Author
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Wallace KJ and Jago M
- Subjects
- Humans, Biodiversity, Communication, Decision Making
- Abstract
How entities, the things that exist, are defined and categorised affects all aspects of environmental management including technical descriptions, quantitative analyses, participatory processes, planning, and decisions. Consequently, ambiguous definitions and wrongly assigning entities to categories, referred to as category mistakes, are barriers to effective management. Confusion caused by treating the term 'biodiversity' variously as the property of an area, the biota of an area, and a preferred end state (a value) - quite different categories of entities - is one example. To overcome such difficulties, we develop and define four entity categories - elements, processes, properties, and values - and two derived categories - states and systems. We argue that adoption of these categories and definitions will significantly improve environmental communication and analysis, and thus strengthen planning and decision-making., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
- Published
- 2017
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27. Cryptic sexual dimorphism in spatial memory and hippocampal oxytocin receptors in prairie voles (Microtus ochrogaster).
- Author
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Rice MA, Hobbs LE, Wallace KJ, and Ophir AG
- Subjects
- Animals, Cognition physiology, Female, Male, Oxytocin metabolism, Arvicolinae metabolism, Arvicolinae psychology, Hippocampus metabolism, Receptors, Oxytocin metabolism, Sex Characteristics, Spatial Memory physiology
- Abstract
Sex differences are well documented and are conventionally associated with intense sex-specific selection. For example, spatial memory is frequently better in males, presumably due to males' tendency to navigate large spaces to find mates. Alternatively, monogamy (in which sex-specific selection is relatively relaxed) should diminish or eliminate differences in spatial ability and the mechanisms associated with this behavior. Nevertheless, phenotypic differences between monogamous males and females persist, sometimes cryptically. We hypothesize that sex-specific cognitive demands are present in monogamous species that will influence neural and behavioral phenotypes. The effects of these demands should be observable in spatial learning performance and neural structures associated with spatial learning and memory. We analyzed spatial memory performance, hippocampal volume and cell density, and hippocampal oxytocin receptor (OTR) expression in the socially monogamous prairie vole. Compared to females, males performed better in a spatial memory and spatial learning test. Although we found no sex difference in hippocampal volume or cell density, male OTR density was significantly lower than females, suggesting that performance may be regulated by sub-cellular mechanisms within the hippocampus that are less obvious than classic neuroanatomical features. Our results suggest an expanded role for oxytocin beyond facilitating social interactions, which may function in part to integrate social and spatial information., (Copyright © 2017 Elsevier Inc. All rights reserved.)
- Published
- 2017
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28. Exotic weeds and fluctuating microclimate can constrain native plant regeneration in urban forest restoration.
- Author
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Wallace KJ, Laughlin DC, and Clarkson BD
- Subjects
- Cities, Introduced Species, New Zealand, Conservation of Natural Resources, Forests, Microclimate, Plant Weeds growth & development, Trees growth & development
- Abstract
Restoring forest structure and composition is an important component of urban land management, but we lack clear understanding of the mechanisms driving restoration success. Here we studied two indicators of restoration success in temperate rainforests: native tree regeneration and epiphyte colonization. We hypothesized that ecosystem properties such as forest canopy openness, abundance of exotic herbaceous weeds, and the microclimate directly affect the density and diversity of native tree seedlings and epiphytes. Relationships between environmental conditions and the plant community were investigated in 27 restored urban forests spanning 3-70 years in age and in unrestored and remnant urban forests. We used structural equation modelling to determine the direct and indirect drivers of native tree regeneration and epiphyte colonization in the restored forests. Compared to remnant forest, unrestored forest had fewer native canopy tree species, significantly more light reaching the forest floor annually, and higher exotic weed cover. Additionally, epiphyte density was lower and native tree regeneration density was marginally lower in the unrestored forests. In restored forests, light availability was reduced to levels found in remnant forests within 20 years of restoration planting, followed shortly thereafter by declines in herbaceous exotic weeds and reduced fluctuation of relative humidity and soil temperatures. Contrary to expectations, canopy openness was only an indirect driver of tree regeneration and epiphyte colonization, but it directly regulated weed cover and microclimatic fluctuations, both of which directly drove the density and richness of regeneration and epiphyte colonization. Epiphyte density and diversity were also positively related to forest basal area, as large trees provide physical habitat for colonization. These results imply that ecosystem properties change predictably after initial restoration plantings, and that reaching critical thresholds in some ecosystem properties makes conditions suitable for the regeneration of late successional species, which is vital for restoration success and long-term ecosystem sustainability. Abiotic and biotic conditions that promote tree regeneration and epiphyte colonization will likely be present in forests with a basal area ≥27 m
2 /ha. We recommend that urban forest restoration plantings be designed to promote rapid canopy closure to reduce light availability, suppress herbaceous weeds, and stabilize the microclimate., (© 2017 by the Ecological Society of America.)- Published
- 2017
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29. Crystal structure of di-aqua-bis-(7-di-ethyl-amino-3-formyl-2-oxo-2H-chromen-4-olato-κ(2) O (3),O (4))zinc(II) dimethyl sulfoxide disolvate.
- Author
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Davis AB, Fronczek FR, and Wallace KJ
- Abstract
The structure of the title coordination complex, [Zn(C14H14NO4)2(H2O)2]·2C2H6OS, shows that the Zn(II) cation adopts an octa-hedral geometry and lies on an inversion center. Two organic ligands occupy the equatorial positions of the coordination sphere, forming a chelate ring motif via the O atom on the formyl group and another O atom of the carbonyl group (a pseudo-β-diketone motif). Two water mol-ecules occupy the remaining coordination sites of the Zn(II) cation in the axial positions. The water mol-ecules are each hydrogen bonded to a single dimethyl sulfoxide mol-ecule that has been entrapped in the crystal lattice.
- Published
- 2016
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30. The contribution of nature to people: Applying concepts of values and properties to rate the management importance of natural elements.
- Author
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Smith MJ, Wagner C, Wallace KJ, Pourabdollah A, and Lewis L
- Subjects
- Attitude, Biodiversity, Fuzzy Logic, Humans, Social Values, Conservation of Natural Resources, Models, Theoretical
- Abstract
An important, and yet unresolved question in natural resource management is how best to manage natural elements and their associated values to ensure human wellbeing. Specifically, there is a lack of measurement tools to assess the contribution of nature to people. We present one approach to overcome this global issue and show that the preferred state of any system element, in terms of realising human values, is a function of element properties. Consequently, natural resource managers need to understand the nature of the relationships between element properties and values if they are to successfully manage for human wellbeing. In two case studies of applied planning, we demonstrate how to identify key element properties, quantify their relationships to priority human values, and combine this information to model the contribution of elements to human wellbeing. In one of the two case studies we also compared the modelling outputs with directly elicited stakeholder opinions regarding the importance of the elements for realising the given priority values. The two, largely congruent outputs provide additional support for the approach. The study shows that rating sets of elements on their relative overall value for human wellbeing, or utility, provides critical information for subsequent management decisions and a basis for productive new research. We consider that the described approach is broadly applicable within the domain of natural resource management., (Copyright © 2016 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2016
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31. Small molecule recognition of mephedrone using an anthracene molecular clip.
- Author
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Kellett K, Broome JH, Zloh M, Kirton SB, Fergus S, Gerhard U, Stair JL, and Wallace KJ
- Abstract
An anthracene molecular probe has been synthesised and shown to target mephedrone, a stimulant drug from the cathinone class of new psychoactive substances (NPS). A protocol has been developed to detect mephedrone via the probe using NMR spectroscopy in a simulated street sample containing two of the most common cutting agents, benzocaine and caffeine.
- Published
- 2016
- Full Text
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32. Eliciting human values for conservation planning and decisions: A global issue.
- Author
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Wallace KJ, Wagner C, and Smith MJ
- Subjects
- Global Health, Humans, International Cooperation, Western Australia, Conservation of Natural Resources, Expert Testimony, Planning Techniques, Social Values
- Published
- 2016
- Full Text
- View/download PDF
33. A cross reactive sensor array to probe divalent metal ions.
- Author
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Mallet AM, Davis AB, Davis DR, Panella J, Wallace KJ, and Bonizzoni M
- Abstract
A simple sensing ensemble was designed to discriminate structurally similar divalent metal chlorides utilizing multivariate data analysis. The system features the binding of four synthesized coumarin-enamine probes to a series of ten metal chlorides. Linear discriminant analysis (LDA) achieves what univariate data analysis alone cannot i.e., full analyte discrimination and differentiation.
- Published
- 2015
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34. Potential drug interactions and chemotoxicity in older patients with cancer receiving chemotherapy.
- Author
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Popa MA, Wallace KJ, Brunello A, Extermann M, and Balducci L
- Subjects
- Aged, Aged, 80 and over, Anti-Inflammatory Agents, Non-Steroidal adverse effects, Antifungal Agents adverse effects, Drug Interactions, Female, Humans, Male, Nonprescription Drugs adverse effects, Plant Preparations adverse effects, Prescription Drugs adverse effects, Retrospective Studies, Antineoplastic Combined Chemotherapy Protocols adverse effects, Neoplasms drug therapy
- Abstract
Purpose: Increased risk of drug interactions due to polypharmacy and aging-related changes in physiology among older patients with cancer is further augmented during chemotherapy. No previous studies examined potential drug interactions (PDIs) from polypharmacy and their association with chemotherapy tolerance in older patients with cancer., Methods: This study is a retrospective medical chart review of 244 patients aged 70+ years who received chemotherapy for solid or hematological malignancies. PDI among all drugs, supplements, and herbals taken with the first chemotherapy cycle were screened for using the Drug Interaction Facts software, which classifies PDIs into five levels of clinical significance with level 1 being the highest. Descriptive and correlative statistics were used to describe rates of PDI. The association between PDI and severe chemotoxicity was tested with logistic regressions adjusted for baseline covariates., Results: A total of 769 PDIs were identified in 75.4% patients. Of the 82 level 1 PDIs identified among these, 32 PDIs involved chemotherapeutics. A large proportion of the identified PDIs were of minor clinical significance. The risk of severe non-hematological toxicity almost doubled with each level 1 PDI (OR=1.94, 95% CI: 1.22-3.09), and tripled with each level 1 PDI involving chemotherapeutics (OR=3.08, 95% CI: 1.33-7.12). No association between PDI and hematological toxicity was found., Conclusions: In this convenience sample of older patients with cancer receiving chemotherapy we found notable rates of PDI and a substantial adjusted impact of PDI on risk of non-hematological toxicity. These findings warrant further research to optimize chemotherapy outcomes., (Copyright © 2014 Elsevier Inc. All rights reserved.)
- Published
- 2014
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35. A fluorescent dipyrrinone oxime for the detection of pesticides and other organophosphates.
- Author
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Walton I, Davis M, Munro L, Catalano VJ, Cragg PJ, Huggins MT, and Wallace KJ
- Subjects
- Coloring Agents, Fluorescent Dyes chemistry, Molecular Structure, Organophosphates analysis, Oximes chemistry, Pesticides analysis, Positron-Emission Tomography, Fluorescent Dyes chemical synthesis, Models, Molecular, Organophosphates chemistry, Oximes chemical synthesis, Pesticides chemistry
- Abstract
An N,N-carbonyl-bridged dipyrrinone oxime has been synthesized and studied as a potential sensor for organophosphates. The molecular sensor underwent a drastic colorimetric response upon formation of the adduct. The pesticide dimethoate was found to produce the biggest spectral response, with a limit of detection equal to 4.0 ppm using UV-visible spectroscopy. Minimal fluorescence "turn on" via a PET mechanism was seen, and molecular modeling studies were used to explain the lower than expected PET response. The X-ray crystal structure of the fluorescent dipyrrinone oxime was also obtained.
- Published
- 2012
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- View/download PDF
36. A pyrene-based fluorescent sensor for Zn2+ ions: a molecular 'butterfly'.
- Author
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Manandhar E, Broome JH, Myrick J, Lagrone W, Cragg PJ, and Wallace KJ
- Subjects
- Acetonitriles chemistry, Ions chemistry, Pyrenes chemical synthesis, Spectrometry, Fluorescence, Triazoles chemistry, Chlorides chemistry, Fluorescent Dyes chemistry, Pyrenes chemistry, Zinc Compounds chemistry
- Abstract
A simple pyrene-based triazole receptor has been synthesised and shown to self-assemble in the presence of ZnCl(2) in an exclusively 2:1 ratio, whereas a mixture of 2:1 and 1:1 ratios are observed for other Zn(2+) salts. The pyrene units are syn in orientation; this is supported by a strong excimer signal observed at 410 nm in the presence of ZnCl(2) in acetonitrile. DFT calculations and 2D NMR support the proposed structure., (This journal is © The Royal Society of Chemistry 2011)
- Published
- 2011
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37. Conformational and configurational analysis of an N,N carbonyl dipyrrinone-derived oximate and nitrone by NMR and quantum chemical calculations.
- Author
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Walton I, Davis M, Yang L, Zhang Y, Tillman D, Jarrett WL, Huggins MT, and Wallace KJ
- Subjects
- Antidotes chemical synthesis, Biosensing Techniques methods, Cholinesterase Reactivators chemical synthesis, Magnetic Resonance Spectroscopy, Molecular Conformation, Nitrogen Oxides chemistry, Oximes chemistry, Pyridinium Compounds chemical synthesis, Quantum Theory, Stereoisomerism, Thermodynamics, Antidotes analysis, Cholinesterase Reactivators analysis, Nitrogen Oxides analysis, Oximes analysis, Pyridinium Compounds analysis
- Abstract
The geometries and relative energies of new N,N carbonyl dipyrrinone-derived oxime molecules (E/Z-s-cis 4a and E/Z-s-cis 4b) have been investigated. The calculated energies, molecular geometries, and (1) H/(13) C NMR chemical shifts agree with experimental data, and the results are presented herein. The E-s-cis conformations of 4a and 4b and the Z-s-cis conformation of 5b were found to be the thermodynamically most stable isomers with the oxime hydrogen atom or the methyl functional group adopting an anti-orientation with respect to the dipyrrinone group. This conformation was unambiguously supported by a number of 2D NMR experiments., (Copyright © 2011 John Wiley & Sons, Ltd.)
- Published
- 2011
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38. A lanthanide-based chemosensor for bioavailable Fe3+ using a fluorescent siderophore: an assay displacement approach.
- Author
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Orcutt KM, Jones WS, McDonald A, Schrock D, and Wallace KJ
- Subjects
- Deferoxamine chemistry, Rhodophyta chemistry, Spectrophotometry, Ultraviolet, Ferric Compounds analysis, Fluorescence Resonance Energy Transfer, Lanthanoid Series Elements chemistry, Siderophores chemistry
- Abstract
The measurement of trace analytes in aqueous systems has become increasingly important for understanding ocean primary productivity. In oceanography, iron (Fe) is a key element in regulating ocean productivity, microplankton assemblages and has been identified as a causative element in the development of some harmful algal blooms. The chemosenor developed in this study is based on an indicator displacement approach that utilizes time-resolved fluorescence and fluorescence resonance energy transfer as the sensing mechanism to achieve detection of Fe3+ ions as low as 5 nM. This novel approach holds promise for the development of photoactive chemosensors for ocean deployment.
- Published
- 2010
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39. Squaraine dyes in molecular recognition and self-assembly.
- Author
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McEwen JJ and Wallace KJ
- Abstract
Squaraine dye molecules and their derivatives are gaining significant interest in the field of supramolecular chemistry, both in host-guest recognition and self-assembly. The unique structure and properties of squaraine molecules has led to extensive research into their use as sensors. This feature article covers the most recent studies (2004-2009) in the development, characterization, and application of squaraine dye-based molecular sensors, self-assembly, and their use in polymeric materials and biological applications.
- Published
- 2009
- Full Text
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40. Functional annotations of diabetes nephropathy susceptibility loci through analysis of genome-wide renal gene expression in rat models of diabetes mellitus.
- Author
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Hu Y, Kaisaki PJ, Argoud K, Wilder SP, Wallace KJ, Woon PY, Blancher C, Tarnow L, Groop PH, Hadjadj S, Marre M, Parving HH, Farrall M, Cox RD, Lathrop M, Vionnet N, Bihoreau MT, and Gauguier D
- Abstract
Background: Hyperglycaemia in diabetes mellitus (DM) alters gene expression regulation in various organs and contributes to long term vascular and renal complications. We aimed to generate novel renal genome-wide gene transcription data in rat models of diabetes in order to test the responsiveness to hyperglycaemia and renal structural changes of positional candidate genes at selected diabetic nephropathy (DN) susceptibility loci., Methods: Both Affymetrix and Illumina technologies were used to identify significant quantitative changes in the abundance of over 15,000 transcripts in kidney of models of spontaneous (genetically determined) mild hyperglycaemia and insulin resistance (Goto-Kakizaki-GK) and experimentally induced severe hyperglycaemia (Wistar-Kyoto-WKY rats injected with streptozotocin [STZ])., Results: Different patterns of transcription regulation in the two rat models of diabetes likely underlie the roles of genetic variants and hyperglycaemia severity. The impact of prolonged hyperglycaemia on gene expression changes was more profound in STZ-WKY rats than in GK rats and involved largely different sets of genes. These included genes already tested in genetic studies of DN and a large number of protein coding sequences of unknown function which can be considered as functional and, when they map to DN loci, positional candidates for DN. Further expression analysis of rat orthologs of human DN positional candidate genes provided functional annotations of known and novel genes that are responsive to hyperglycaemia and may contribute to renal functional and/or structural alterations., Conclusion: Combining transcriptomics in animal models and comparative genomics provides important information to improve functional annotations of disease susceptibility loci in humans and experimental support for testing candidate genes in human genetics.
- Published
- 2009
- Full Text
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41. Pathophysiological, genetic and gene expression features of a novel rodent model of the cardio-metabolic syndrome.
- Author
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Wallis RH, Collins SC, Kaisaki PJ, Argoud K, Wilder SP, Wallace KJ, Ria M, Ktorza A, Rorsman P, Bihoreau MT, and Gauguier D
- Subjects
- Animals, Arginine pharmacology, Basal Metabolism, Blood Glucose metabolism, Blood Pressure, Body Weight, Chromosome Mapping, Disease Models, Animal, Glucose pharmacology, Insulin blood, Insulin metabolism, Insulin Secretion, Islets of Langerhans metabolism, Lipids blood, Quantitative Trait Loci, Rats, Rats, Inbred Strains genetics, Diabetes Mellitus, Type 2 genetics, Hyperglycemia genetics, Hyperinsulinism genetics, Obesity genetics
- Abstract
Background: Complex etiology and pathogenesis of pathophysiological components of the cardio-metabolic syndrome have been demonstrated in humans and animal models., Methodology/principal Findings: We have generated extensive physiological, genetic and genome-wide gene expression profiles in a congenic strain of the spontaneously diabetic Goto-Kakizaki (GK) rat containing a large region (110 cM, 170 Mb) of rat chromosome 1 (RNO1), which covers diabetes and obesity quantitative trait loci (QTL), introgressed onto the genetic background of the normoglycaemic Brown Norway (BN) strain. This novel disease model, which by the length of the congenic region closely mirrors the situation of a chromosome substitution strain, exhibits a wide range of abnormalities directly relevant to components of the cardio-metabolic syndrome and diabetes complications, including hyperglycaemia, hyperinsulinaemia, enhanced insulin secretion both in vivo and in vitro, insulin resistance, hypertriglyceridemia and altered pancreatic and renal histological structures. Gene transcription data in kidney, liver, skeletal muscle and white adipose tissue indicate that a disproportionately high number (43-83%) of genes differentially expressed between congenic and BN rats map to the GK genomic interval targeted in the congenic strain, which represents less than 5% of the total length of the rat genome. Genotype analysis of single nucleotide polymorphisms (SNPs) in strains genetically related to the GK highlights clusters of conserved and strain-specific variants in RNO1 that can assist the identification of naturally occurring variants isolated in diabetic and hypertensive strains when different phenotype selection procedures were applied., Conclusions: Our results emphasize the importance of rat congenic models for defining the impact of genetic variants in well-characterised QTL regions on in vivo pathophysiological features and cis-/trans- regulation of gene expression. The congenic strain reported here provides a novel and sustainable model for investigating the pathogenesis and genetic basis of risks factors for the cardio-metabolic syndrome.
- Published
- 2008
- Full Text
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42. A Colorimetric Chemodosimeter for Pd(II): A Method for Detecting Residual Palladium in Cross-Coupling Reactions.
- Author
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Houk RJ, Wallace KJ, Hewage HS, and Anslyn EV
- Abstract
A colorimetric chemodosimeter (SQ1) for the detection of trace palladium salts in cross-coupling reactions mediated by palladium is described. Decolorization of SQ1 is affected by nucleophilic attack of ethanethiol in basic DMSO solutions. Thiol addition is determined to have an equilibrium constant (K(eq)) of 2.9 × 10(6) M(-1), with a large entropic and modest enthalpic driving force. This unusual result is attributed to solvent effects arising from a strong coordinative interaction between DMSO and the parent squaraine. Palladium detection is achieved through thiol scavenging from the SQ1-ethanethiol complex leading to a color "turn-on" of the parent squaraine. It was found that untreated samples obtained directly from Suzuki couplings showed no response to the assay. However, treatment of the samples with aqueous nitric acid generates a uniform Pd(NO(3))(2) species, which gives an appropriate response. "Naked-eye" detection of Pd(NO(3))(2) was estimated to be as low as 0.5 ppm in solution, and instrument-based detection was tested as low as 100 ppb. The average error over the working range of the assay was determined to be 7%.
- Published
- 2008
- Full Text
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43. Novel chemiluminescent detection of chemical warfare simulant.
- Author
-
Hewage HS, Wallace KJ, and Anslyn EV
- Abstract
A glow assay technology for the detection of a chemical warfare simulant is presented, which is based on modulating the peroxyoxalate chemiluminescence pathway by way of utilising an oximate super nucleophile that gives an "off-on" glow response.
- Published
- 2007
- Full Text
- View/download PDF
44. Columbus Regional Hospital: creating a learning environment.
- Author
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Wallace KJ and Glesing D
- Subjects
- Hospital Design and Construction, Hospitals, General organization & administration, Humans, Interprofessional Relations, Ohio, Organizational Case Studies, Organizational Innovation, Patient-Centered Care organization & administration, Awards and Prizes, Hospitals, General standards, Quality of Health Care standards
- Published
- 2007
- Full Text
- View/download PDF
45. Detection of chemical warfare simulants by phosphorylation of a coumarin oximate.
- Author
-
Wallace KJ, Fagbemi RI, Folmer-Andersen FJ, Morey J, Lynth VM, and Anslyn EV
- Abstract
The detection of chemical warfare simulants is attained by the PET mechanism that gives an "off-on" fluorescent response with a half-life of approximately 50 ms upon phosphorylation of a reactive oximate functionality; the X-ray crystal structure of the oximate was also obtained and is discussed.
- Published
- 2006
- Full Text
- View/download PDF
46. Mapping diabetes QTL in an intercross derived from a congenic strain of the Brown Norway and Goto-Kakizaki rats.
- Author
-
Collins SC, Wallis RH, Wilder SP, Wallace KJ, Argoud K, Kaisaki PJ, Bihoreau MT, and Gauguier D
- Subjects
- Animals, Female, Male, Rats, Rats, Inbred BN, Animals, Congenic, Chromosome Mapping, Crosses, Genetic, Diabetes Mellitus, Type 2 genetics, Diabetes Mellitus, Type 2 physiopathology, Quantitative Trait Loci
- Abstract
Genetic studies in experimental crosses derived from the inbred Goto-Kakizaki (GK) rat model of spontaneous diabetes mellitus have identified quantitative trait loci (QTL) for diabetes phenotypes in a large region of rat Chromosome (RNO) 1. To test the impact of GK variants on QTL statistical and biological features, we combined genetic and physiologic studies in a cohort of F(2) hybrids derived from a QTL substitution congenic strain (QTLSCS) carrying a 110-cM GK haplotype of RNO1 introgressed onto the genetic background of the Brown Norway (BN) strain. Glucose intolerance and altered insulin secretion in QTLSCS rats when compared with BN controls were consistent with original QTL features in a GK x BN F(2) cross. Segregating GK alleles in the QTLSCS F(2) cross account for most of these phenotypic differences between QTLSCS and BN rats. However, significant QTL for diabetes traits in both the QTLSCS and GK x BN F(2) cohorts account for a similar small proportion of their variance. Comparing results from these experimental systems provides indirect estimates of the contribution of genetic interactions and environmental factors to QTL architecture as well as locus and biological targets for future post-QTL mapping studies in congenic substrains.
- Published
- 2006
- Full Text
- View/download PDF
47. Genomic organization of the rat Clock gene and sequence analysis in inbred rat strains.
- Author
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Woon PY, Curtis AM, Kaisaki PJ, Argoud K, Wallace KJ, Bihoreau MT, FitzGerald GA, and Gauguier D
- Subjects
- 5' Untranslated Regions, Amino Acid Sequence, Animals, Base Sequence, CLOCK Proteins, DNA genetics, Exons, Humans, Molecular Sequence Data, Promoter Regions, Genetic, Rats, Rats, Inbred Strains, Sequence Homology, Amino Acid, Sequence Homology, Nucleic Acid, Trans-Activators chemistry, Genomics, Trans-Activators genetics
- Abstract
While mutations in genes that function in the core molecular clock may disrupt circadian periodicity, their relevance to diurnal variation in metabolic, cardiovascular, and respiratory function is unknown. The circadian Clock gene product is an essential regulator of central and peripheral circadian rhythms in mammals. We have elucidated the complete exon-intron organization of the Clock gene in rat and have carried out an extensive search for single nucleotide polymorphisms (SNPs) in a panel of 12 inbred rat strains that exhibit diversity in studies of central and peripheral organ function and disease. The rat Clock gene consists of 23 exons spanning approximately 75 kb. Comparative sequence analysis identified 33 novel SNPs, including 32 that distinguish the Brown Norway (BN) rat from the other strains studied. Most notable were two novel mutations in the BN sequence at exon 8, Ile131Val and Ile132Val, occurring in a segment of the highly conserved PAS-A domain of the protein. These results afford the opportunity to assess the impact of genetic variation in Clock on central and peripheral functions subject to the core molecular clock and to test the importance of Clock variants in explaining diversity among rat strains in the expression of phenotypes, such as blood pressure, subject to circadian oscillation.
- Published
- 2006
- Full Text
- View/download PDF
48. An artificial siderophore for the detection of iron(III).
- Author
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Wallace KJ, Gray M, Zhong Z, Lynch VM, and Anslyn EV
- Subjects
- Cations, Cyclobutanes chemistry, Iron chemistry, Ligands, Molecular Structure, Thermodynamics, Chelating Agents chemical synthesis, Cyclobutanes chemical synthesis, Iron analysis, Phenols chemical synthesis, Siderophores chemical synthesis
- Abstract
An artificial siderophore in the form of a squaraine dye (1) has been synthesized. The bidentate ligand chelates to Fe(III) between the deprotonated hydroxyl group on the ortho position of the ring adjacent to the carbonyl group of the cyclobutadiene ring. The optical response is due to a subtle geometry change of 1 on chelation to Fe(III). This artificial siderophore forms a 2 ratio 1 ligand ratio metal complex, as indicated by a sigmoidal isotherm (K(a)= 10(7) M(-1)). The optical response on the addition of Fe(III) is observed at low concentrations in comparison to other metal salts. The X-ray crystal structure and calculated structures of dye (1) are also included, and will be discussed.
- Published
- 2005
- Full Text
- View/download PDF
49. Quantitative trait locus dissection in congenic strains of the Goto-Kakizaki rat identifies a region conserved with diabetes loci in human chromosome 1q.
- Author
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Wallace KJ, Wallis RH, Collins SC, Argoud K, Kaisaki PJ, Ktorza A, Woon PY, Bihoreau MT, and Gauguier D
- Subjects
- Animals, Animals, Congenic, Body Weight, Crosses, Genetic, Female, Gene Expression Profiling, Genomics, Glucose pharmacology, Glucose Intolerance genetics, Humans, Hyperinsulinism genetics, Insulin metabolism, Insulin Secretion, Lipids blood, Male, Phenotype, Polymorphism, Genetic genetics, Rats, Rats, Inbred BN, Rats, Inbred Strains, Sequence Analysis, DNA, Transcription, Genetic genetics, Chromosomes, Human, Pair 1 genetics, Conserved Sequence genetics, Diabetes Mellitus, Type 2 genetics, Quantitative Trait Loci genetics
- Abstract
Genetic studies in human populations and rodent models have identified regions of human chromosome 1q21-25 and rat chromosome 2 showing evidence of significant and replicated linkage to diabetes-related phenotypes. To investigate the relationship between the human and rat diabetes loci, we fine mapped the rat locus Nidd/gk2 linked to hyperinsulinemia in an F2 cross derived from the diabetic (type 2) Goto-Kakizaki (GK) rat and the Brown Norway (BN) control rat, and carried out its genetic and pathophysiological characterization in BN.GK congenic strains. Evidence of glucose intolerance and enhanced insulin secretion in a congenic strain allowed us to localize the underlying diabetes gene(s) in a rat chromosomal interval of approximately 3-6 cM conserved with an 11-Mb region of human 1q21-23. Positional diabetes candidate genes were tested for transcriptional changes between congenics and controls and sequence variations in a panel of inbred rat strains. Congenic strains of the GK rats represent powerful novel models for accurately defining the pathophysiological impact of diabetes gene(s) at the locus Nidd/gk2 and improving functional annotations of diabetes candidates in human 1q21-23.
- Published
- 2004
- Full Text
- View/download PDF
50. An egr-1 (zif268) antisense oligodeoxynucleotide infused into the amygdala disrupts fear conditioning.
- Author
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Malkani S, Wallace KJ, Donley MP, and Rosen JB
- Subjects
- Amygdala drug effects, Animals, Association Learning drug effects, Association Learning physiology, Avoidance Learning drug effects, Avoidance Learning physiology, Conditioning, Classical drug effects, DNA-Binding Proteins administration & dosage, Dose-Response Relationship, Drug, Early Growth Response Protein 1, Environment, Fear drug effects, Freezing Reaction, Cataleptic drug effects, Freezing Reaction, Cataleptic physiology, Immediate-Early Proteins administration & dosage, Male, Memory drug effects, Microinjections, Oligodeoxyribonucleotides, Antisense administration & dosage, Rats, Rats, Sprague-Dawley, Transcription Factors administration & dosage, Amygdala physiology, Carrier Proteins physiology, Conditioning, Classical physiology, Fear physiology, Membrane Proteins physiology, Memory physiology
- Abstract
Studies of gene expression following fear conditioning have demonstrated that the inducible transcription factor, egr-1, is increased in the lateral nucleus of the amygdala shortly following fear conditioning. These studies suggest that egr-1 and its protein product Egr-1 in the amygdala are important for learning and memory of fear. To directly test this hypothesis, an egr-1 antisense oligodeoxynucleotide (antisense-ODN) was injected bilaterally into the amygdala prior to contextual fear conditioning. The antisense-ODN reduced Egr-1 protein in the amygdala and interfered with fear conditioning. A 250-pmole dose produced an 11% decrease in Egr-1 protein and reduced long-term memory of fear as measured by freezing in a retention test 24 h after conditioning, but left shock-induced freezing intact. A larger 500-pmole dose produced a 25% reduction in Egr-1 protein and significantly decreased both freezing immediately following conditioning and freezing in the retention test. A nonsense-ODN had no effect on postshock or retention test freezing. In addition, 500 pmole of antisense-ODN infused prior to the retention test in previously trained rats did not reduce freezing, indicating that antisense-ODN did not suppress conditioned fear behavior. Finally, rats infused with 500 pmole of antisense-ODN displayed unconditioned fear to a predator odor, demonstrating that unconditioned freezing was unaffected by the antisense-ODN. The data indicate that the egr-1 antisense-ODN interferes with learning and memory processes of fear without affecting freezing behavior and suggests that the inducible transcription factor Egr-1 within the amygdala plays important functions in long-term learning and memory of fear.
- Published
- 2004
- Full Text
- View/download PDF
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