209 results on '"Takuya Ishida"'
Search Results
2. Aberrant brain dynamics of large-scale functional networks across schizophrenia and mood disorder
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Takuya Ishida, Shinichi Yamada, Kasumi Yasuda, Shinya Uenishi, Atsushi Tamaki, Michiyo Tabata, Natsuko Ikeda, Shun Takahashi, and Sohei Kimoto
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Energy-landscape analysis ,Resting-state fMRI ,Default mode network ,Psychiatric disorder ,Computer applications to medicine. Medical informatics ,R858-859.7 ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Introduction: The dynamics of large-scale networks, which are known as distributed sets of functionally synchronized brain regions and include the visual network (VIN), somatomotor network (SMN), dorsal attention network (DAN), salience network (SAN), limbic network (LIN), frontoparietal network (FPN), and default mode network (DMN), play important roles in emotional and cognitive processes in humans. Although disruptions in these large-scale networks are considered critical for the pathophysiological mechanisms of psychiatric disorders, their role in psychiatric disorders remains unknown. We aimed to elucidate the aberrant dynamics across large-scale networks in patients with schizophrenia (SZ) and mood disorders. Methods: We performed energy-landscape analysis to investigate the aberrant brain dynamics of seven large-scale networks across 50 healthy controls (HCs), 36 patients with SZ, and 42 patients with major depressive disorder (MDD) recruited at Wakayama Medical University. We identified major patterns of brain activity using energy-landscape analysis and estimated their duration, occurrence, and ease of transition. Results: We identified four major brain activity patterns that were characterized by the activation patterns of the DMN and VIN (state 1, DMN (-) VIN (-); state 2, DMN (+) VIN (+); state 3, DMN (-) VIN (+); and state 4, DMN (+) VIN (-)). The duration of state 1 and the occurrence of states 1 and 2 were shorter in the SZ group than in HCs and the MDD group, and the duration of state 3 was longer in the SZ group. The ease of transition between states 3 and 4 was larger in the SZ group than in the HCs and the MDD group. The ease of transition from state 3 to state 4 was negatively associated with verbal fluency in patients with SZ. The current study showed that the brain dynamics was more disrupted in SZ than in MDD. Conclusions: Energy-landscape analysis revealed aberrant brain dynamics across large-scale networks between SZ and MDD and their associations with cognitive abilities in SZ, which cannot be captured by conventional functional connectivity analyses. These results provide new insights into the pathophysiological mechanisms underlying SZ and mood disorders.
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- 2024
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3. Diagnostic Utility of Specific Frailty Questionnaire: The Kihon Checklist for Hippocampal Atrophy in COPD
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Tsunahiko Hirano, Shun Takahashi, Ayumi Fukatsu-Chikumoto, Kasumi Yasuda, Takuya Ishida, Tomohiro Donishi, Kazuyoshi Suga, Keiko Doi, Keiji Oishi, Shuichiro Ohata, Yoriyuki Murata, Yoshikazu Yamaji, Maki Asami-Noyama, Nobutaka Edakuni, Tomoyuki Kakugawa, and Kazuto Matsunaga
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Kihon Checklist ,hippocampal atrophy ,diagnostic utility ,COPD ,daily inactivity ,Medicine - Abstract
Background/Objectives: COPD patients who are frail have been reported to develop brain atrophy, but no non-invasive diagnostic tool has been developed to detect this condition. Our study aimed to explore the diagnostic utility of the Kihon Checklist (KCL), a frailty questionnaire, in assessing hippocampal volume loss in patients with COPD. Methods: We recruited 40 COPD patients and 20 healthy individuals using the KCL to assess frailty across seven structural domains. Hippocampal volumes were obtained from T1-weighted MRI images, and ROC analysis was performed to detect hippocampal atrophy. Results: Our results showed that patients with COPD had significantly greater atrophic left hippocampal volumes than healthy subjects (p < 0.05). The univariate correlation coefficient between the left hippocampal volume and KCL (1–20), which pertains to instrumental and social activities of daily living, was the largest (ρ = −0.54, p < 0.0005) among the KCL subdomains. Additionally, both KCL (1–25) and KCL (1–20) demonstrated useful diagnostic potential (93% specificity and 90% sensitivity, respectively) for identifying individuals in the lowest 25% of the left hippocampal volume (AUC = 0.82). Conclusions: Our study suggests that frailty questionnaires focusing on daily vulnerability, such as the KCL, can effectively detect hippocampal atrophy in COPD patients.
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- 2024
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4. Phosphorus speciation in coastal sediment of Osaka Bay: relation to anthropogenic phosphorus loading
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Muhammad Shahinur Rahman, Shin-ichi Onodera, Mitsuyo Saito, Takuya Ishida, Kunyang Wang, Takahiro Hosono, and Yu Umezawa
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coastal sediment ,phosphorus species ,urbanization ,riverine phosphorus loading ,Environmental technology. Sanitary engineering ,TD1-1066 ,Environmental sciences ,GE1-350 ,Science ,Physics ,QC1-999 - Abstract
This study assessed the effect of increased anthropogenic phosphorus (P) loading on P speciation in coastal sediments in Osaka Bay, an urbanized enclosed bay, and one of Japan’s most industrialized regions. The study analyzed Total P (TP) and determined the accumulations of five different P species Exchangeable P (Ex-P), Iron-bound P (Fe-P), Calcium-bound P (Ca-P), Detrital P (Det-P) and Organic P (Org-P)in the sediment using the sequential extraction method. We also estimated the historical P loading into Osaka Bay from major river catchments (the Yodo and Yamato Rivers) using the Soil and Water Assessment Tool. This study identified peak P loading values for the Yodo River in 1965 and the Yamato River in 1968, with the Yodo River being the primary anthropogenic source of P inflow for Osaka Bay. The concentration of TP ranges from 290.5 to 353.1 mg Kg ^−1 respectively, and the order of concentrations of the different P species is Org-P > Det-P > Ca-P > Fe-P > Ex-P. The results indicate a positive relationship between total P loading and Ca-P during the rapid growth period. We examined two potential mechanisms (adsorption-precipitation process and sink switching) for Ca-P formation and hypothesized that the adsorption-precipitation process is the dominant process, indicating that high anthropogenic P loading causes the accumulation of immobile Ca-P species in coastal sediments and serves as a permanent sink for P, as well as for water quality restoration. This result also suggests the possibility of reconstructing historical human-induced P loadings based on Ca-P in coastal sediments.
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- 2024
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5. Nitrate Contamination in Groundwater: Evaluating the Effects of Demographic Aging and Depopulation in an Island with Intensive Citrus Cultivation
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Sharon Bih Kimbi, Shin-Ichi Onodera, Takuya Ishida, Mitsuyo Saito, Masayuki Tamura, Yusuke Tomozawa, and Itaru Nagasaka
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aging ,depopulation ,farmer activity ,fertilizer ,osakishimojima island ,nitrogen isotope ,Hydraulic engineering ,TC1-978 ,Water supply for domestic and industrial purposes ,TD201-500 - Abstract
Despite rapid population aging and depopulation in Japan, groundwater nitrate contamination still poses serious environmental problems. One of the main factors contributing to elevated nitrate levels in Japanese groundwater sources is agricultural intensification, frequently because of increased fertilizer use. We investigated the impact of population aging and depopulation on groundwater nitrate contamination on a western Japanese island that has extensive citrus farming. In comparison to Ocho village, where the average age of farmers is 73 years, Kubi village’s farmers are slightly older on average, at 76 years, and agricultural land has decreased by 46% over the past ten years, from 2005 to 2015. Ocho had 830 residents, which was twice as many as Kubi. In comparison to Ocho (4.8 mg/L), Kubi village had higher average NO3−−N concentrations (6.6 mg/L). NO3−−N contamination sources in Kubi and Ocho were determined using stable nitrogen isotopes and a Bayesian isotope mixing model. These source distributions were more strongly associated with social and land use factors. It was believed that the older farmers in Kubi employed a significant quantity of chemical fertilizers, which caused inefficient nitrogen uptake by plants, leading to increased leaching and more groundwater contamination than in Ocho.
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- 2022
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6. One-Step Electrodeposition of Chiral Plasmonic Gold Nanostructures for Enantioselective Sensing
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Igseon GU, Takuya ISHIDA, and Tetsu TATSUMA
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chiral plasmonic nanostructure ,electrodeposition ,circular dichroism ,enantioselective sensor ,Technology ,Physical and theoretical chemistry ,QD450-801 - Abstract
Chiral plasmonic nanostructures attract much attention because of their potential applications to advanced optical materials and enantioselective sensors. However, the latter has been fabricated on the basis of top-down methods, which take time and cost. Here we developed a one-step method for preparation of chiral gold nanostructures immobilized on an electrode by a simple electrodeposition in the presence of L- or D-cysteine. Opposite circular dichroism (CD) spectra were obtained by using L- or D-cysteine, while achiral structures were deposited for racemic cysteine or in the absence of cysteine. The chirality was attributed to geometries of the nanostructures. Chiral gold nanostructures electrodeposited in the presence of L-cysteine gave higher CD signals to (S)-enantiomer than those to (R)-enantiomer of 1,2-propanediol, and vice versa. TiO2-coated electrodes were also used as a substrate for the electrodeposition of chiral nanostructures, so that the chiral plasmonic electrodes would be employed for optoelectronic and photoelectrochemical applications.
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- 2022
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7. Rice paddy irrigation seasonally impacts stream benthic macroinvertebrate diversity at the catchment level
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Chia‐Ying Ko, Satoshi Asano, Meng‐Ju Lin, Tohru Ikeya, Elfritzson M. Peralta, Ellis Mika C. Triño, Yoshitoshi Uehara, Takuya Ishida, Tomoya Iwata, Ichiro Tayasu, and Noboru Okuda
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benthic macroinvertebrates ,catchment and watershed management ,land use ,rice paddy ,structural equation modeling ,Ecology ,QH540-549.5 - Abstract
Abstract Agriculture is one of the most critical anthropogenic disturbances to freshwater ecosystems globally. In monsoon Asia, rice paddies provide habitats for aquatic species, but how their associated irrigation systems can affect downstream ecosystems is poorly understood. Here, we used structural equation modeling (SEM) to estimate seasonal variations in benthic macroinvertebrate diversity and environments and quantified indirect effects of land use, especially of rice paddy areas, on benthic macroinvertebrate diversity through local environmental alteration. Our study site was the Yasu River tributary of Lake Biwa, Japan, and we performed our investigation during both irrigation and nonirrigation periods, representing different seasons. Seasonal variations in physical and chemical variables and diversity were observed. Seasonal particulate phosphorus concentrations to a large extent determined the abundance and community composition of benthic macroinvertebrates. SEM revealed that the proportions of forest, urban, and rice paddy areas in the catchment had significant indirect effects on biodiversity indices of local benthic macroinvertebrate communities. The proportion of forest area had robust negative effects on water temperature, but the overall indirect effects on the macroinvertebrate diversity contrasted between the two seasonal periods. The proportion of rice paddy area had a strongly negative indirect effect on the diversity through increased particulate phosphorous loading during the irrigation period, while the proportion of urban area had a significantly negative indirect effect during the nonirrigation period only. The seasonal negative impacts of rice paddy irrigation on benthic macroinvertebrate communities were possibly due to siltation arising from rice paddy soils. Our results have implications for environmental restoration and biodiversity conservation in catchment management.
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- 2021
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8. Converging Resting State Networks Unravels Potential Remote Effects of Transcranial Magnetic Stimulation for Major Depression
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Takuya Ishida, Thomas Dierks, Werner Strik, and Yosuke Morishima
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major depressive disorder ,resting-state functional magnetic resonance imaging (fMRI) ,functional connectivity ,repetitive transcranial magnetic stimulation (rTMS) ,dynamic causal modeling (DCM) ,Granger causality analysis (GCA) ,Psychiatry ,RC435-571 - Abstract
Despite being a commonly used protocol to treat major depressive disorder (MDD), the underlying mechanism of repetitive transcranial magnetic stimulation (rTMS) on dorsolateral prefrontal cortex (DLPFC) remains unclear. In the current study, we investigated the resting-state fMRI data of 100 healthy subjects by exploring three overlapping functional networks associated with the psychopathologically MDD-related areas (the nucleus accumbens, amygdala, and ventromedial prefrontal cortex). Our results showed that these networks converged at the bilateral DLPFC, which suggested that rTMS over DLPFC might improve MDD by remotely modulating the MDD-related areas synergistically. Additionally, they functionally converged at the DMPFC and bilateral insula which are known to be associated with MDD. These two areas could also be potential targets for rTMS treatment. Dynamic causal modelling (DCM) and Granger causality analysis (GCA) revealed that all pairwise connections among bilateral DLPFC, DMPFC, bilateral insula, and three psychopathologically MDD-related areas contained significant causality. The DCM results also suggested that most of the functional interactions between MDD-related areas and bilateral DLPFC, DMPFC, and bilateral insula can predominantly be explained by the effective connectivity from the psychopathologically MDD-related areas to the rTMS stimulation sites. Finally, we found the conventional functional connectivity to be a more representative measure to obtain connectivity parameters compared to GCA and DCM analysis. Our research helped inspecting the convergence of the functional networks related to a psychiatry disorder. The results identified potential targets for brain stimulation treatment and contributed to the optimization of patient-specific brain stimulation protocols.
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- 2020
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9. Microstructural abnormalities in callosal fibers and their relationship with cognitive function in schizophrenia: A tract‐specific analysis study
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Yuji Ohoshi, Shun Takahashi, Shinichi Yamada, Takuya Ishida, Kumi Tsuda, Tomikimi Tsuji, Masaki Terada, Kazuhiro Shinosaki, and Satoshi Ukai
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cognition ,corpus callosum ,diffusion tensor imaging ,magnetic resonance imaging ,schizophrenia ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Abstract Introduction The corpus callosum serves the essential role of relaying cognitive information between the homologous regions in the left and the right hemispheres of the brain. Cognitive impairment is a core dysfunction of schizophrenia, but much of its pathophysiology is unknown. The aim of this study was to elucidate the association between microstructural abnormalities of the corpus callosum and cognitive dysfunction in schizophrenia. Methods We examined stepwise multiple regression analysis to investigate the relationship of the fractional anisotropy (FA) of callosal fibers in each segment with z‐scores of each brief assessment of cognition in schizophrenia subtest and cognitive composite score in all subjects (19 patients with schizophrenia [SZ group] and 19 healthy controls [HC group]). Callosal fibers were separated into seven segments based on their cortical projection using tract‐specific analysis of diffusion tensor imaging. Results The FA of callosal fibers in the temporal segment was significantly associated with z‐scores of token motor test, Tower of London test, and the composite score. In the SZ group, the FA of callosal fibers in the temporal segment was significantly associated with the z‐score of the Tower of London test. In addition, the FA of callosal fibers in temporal segment showed significant negative association with the positive and negative syndrome scale negative score in the SZ group. Compared to the HC group, the FA in temporal segment was significantly decreased in the SZ group. Conclusion Our results suggest that microstructural abnormalities in the callosal white matter fibers connecting bilateral temporal lobe cortices contribute to poor executive function and severe negative symptom in patients with schizophrenia.
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- 2019
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10. Interhemispheric disconnectivity in the sensorimotor network in bipolar disorder revealed by functional connectivity and diffusion tensor imaging analysis
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Takuya Ishida, Tomohiro Donishi, Jun Iwatani, Shinichi Yamada, Shun Takahashi, Satoshi Ukai, Kazuhiro Shinosaki, Masaki Terada, and Yoshiki Kaneoke
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Neuroscience ,Medical imaging ,Psychiatry ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background: Little is known regarding interhemispheric functional connectivity (FC) abnormalities via the corpus callosum in subjects with bipolar disorder (BD), which might be a key pathophysiological basis of emotional processing alterations in BD. Methods: We performed tract-based spatial statistics (TBSS) using diffusion tensor imaging (DTI) in 24 healthy control (HC) and 22 BD subjects. Next, we analyzed the neural networks with independent component analysis (ICA) in 32HC and 25 BD subjects using resting-state functional magnetic resonance imaging. Results: In TBSS analysis, we found reduced fractional anisotropy (FA) in the corpus callosum of BD subjects. In ICA, functional within-connectivity was reduced in two clusters in the sensorimotor network (SMN) (right and left primary somatosensory areas) of BD subjects compared with HCs. FC between the two clusters and FA values in the corpus callosum of BD subjects was significantly correlated. Further, the functional within-connectivity was related to Young Mania Rating Scale (YMRS) total scores in the right premotor area in the SMN of BD subjects. Limitations: Almost all of our BD subjects were taking several medications which could be a confounding factor. Conclusions: Our findings suggest that interhemispheric FC dysfunction in the SMN is associated with the impaired nerve fibers in the corpus callosum, which could be one of pathophysiological bases of emotion processing dysregulation in BD patients.
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- 2017
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11. Effect of working fluid in heat transport characteristics of pulsating heat pipe
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Koji FUMOTO, Takuya ISHIDA, Tsuyoshi KAWANAMI, and Takao INAMURA
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pulsating heat pipe ,open loop ,self-rewetting fluid ,thermal resistance ,flow visialization ,liquid film ,Mechanical engineering and machinery ,TJ1-1570 ,Engineering machinery, tools, and implements ,TA213-215 - Abstract
Recently, electronics thermal management faces problems in the wake of component miniaturization, which has led to higher demands on heat flux dissipation. Pulsating heat pipe (PHP) can be used for cooling devices of electronics because of its potential for removing high heat flux. It is well known that various parameters affect the performance of the pulsating heat pipe. Therefore, many researchers have done research on the improvement of performance. This paper presents heat transfer characteristics of the open-loop pulsating heat pipe (OLPHP) using a self-rewetting fluid as working fluids. The heat transfer characteristic results were obtained by PHP that was made of copper tubes of internal diameters 1.8 mm. On the other hand, flow visualization tests were conducted by the use of a PHP that was made of Pyrex-glass tubes with the dimension of the copper tubes PHP. The experimental results indicate that OLPHP using self-rewetting fluid as working fluids can be observed anomalous liquid film behavior in adiabatic section. Especially, it was found that the liquid film was strong wavy when liquid slug moved to cooling section from heating section. The findings showed that the wavy liquid films and liquid slug behavior contributed to the thermal performance improvement.
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- 2016
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12. Real-time dynamic adsorption processes of cytochrome c on an electrode observed through electrochemical high-speed atomic force microscopy.
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Kouta Takeda, Takayuki Uchihashi, Hiroki Watanabe, Takuya Ishida, Kiyohiko Igarashi, Nobuhumi Nakamura, and Hiroyuki Ohno
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Medicine ,Science - Abstract
An understanding of dynamic processes of proteins on the electrode surface could enhance the efficiency of bioelectronics development and therefore it is crucial to gain information regarding both physical adsorption of proteins onto the electrode and its electrochemical property in real-time. We combined high-speed atomic force microscopy (HS-AFM) with electrochemical device for simultaneous observation of the surface topography and electron transfer of redox proteins on an electrode. Direct electron transfer of cytochrome c (cyt c) adsorbed on a self-assembled monolayers (SAMs) formed electrode is very attractive subject in bioelectrochemistry. This paper reports a real-time visualization of cyt c adsorption processes on an 11-mercaptoundecanoic acid-modified Au electrode together with simultaneous electrochemical measurements. Adsorbing cyt c molecules were observed on a subsecond time resolution simultaneously with increasing redox currents from cyt c using EC-HS-AFM. The root mean square roughness (RRMS) from the AFM images and the number of the electrochemically active cyt c molecules adsorbed onto the electrode (Γ) simultaneously increased in positive cooperativity. Cyt c molecules were fully adsorbed on the electrode in the AFM images when the peak currents were steady. This use of electrochemical HS-AFM significantly facilitates understanding of dynamic behavior of biomolecules on the electrode interface and contributes to the further development of bioelectronics.
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- 2015
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13. Characterization of a novel PQQ-dependent quinohemoprotein pyranose dehydrogenase from Coprinopsis cinerea classified into auxiliary activities family 12 in carbohydrate-active enzymes.
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Kouta Takeda, Hirotoshi Matsumura, Takuya Ishida, Masahiro Samejima, Hiroyuki Ohno, Makoto Yoshida, Kiyohiko Igarashi, and Nobuhumi Nakamura
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Medicine ,Science - Abstract
The basidiomycete Coprinopsis cinerea contains a quinohemoprotein (CcPDH named as CcSDH in our previous paper), which is a new type of pyrroloquinoline-quinone (PQQ)-dependent pyranose dehydrogenase and is the first found among all eukaryotes. This enzyme has a three-domain structure consisting of an N-terminal heme b containing a cytochrome domain that is homologous to the cytochrome domain of cellobiose dehydrogenase (CDH; EC 1.1.99.18) from the wood-rotting basidiomycete Phanerochaete chrysosporium, a C-terminal family 1-type carbohydrate-binding module, and a novel central catalytic domain containing PQQ as a cofactor. Here, we describe the biochemical and electrochemical characterization of recombinant CcPDH. UV-vis and resonance Raman spectroscopic studies clearly reveal characteristics of a 6-coordinated low-spin heme b in both the ferric and ferrous states, as well as intramolecular electron transfer from the PQQ to heme b. Moreover, the formal potential of the heme was evaluated to be 130 mV vs. NHE by cyclic voltammetry. These results indicate that the cytochrome domain of CcPDH possesses similar biophysical properties to that in CDH. A comparison of the conformations of monosaccharides as substrates and the associated catalytic efficiency (kcat/Km) of CcPDH indicates that the enzyme prefers monosaccharides with equatorial C-2, C-3 hydroxyl groups and an axial C-4 hydroxyl group in the 1C4 chair conformation. Furthermore, a binding study shows a high binding affinity of CcPDH for cellulose, suggesting that CcPDH function is related to the enzymatic degradation of plant cell wall.
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- 2015
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14. Multidimensional QoE of Multiview Video and Selectable Audio IP Transmission
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Toshiro Nunome and Takuya Ishida
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Technology ,Medicine ,Science - Abstract
We evaluate QoE of multiview video and selectable audio (MVV-SA), in which users can switch not only video but also audio according to a viewpoint change request, transmitted over IP networks by a subjective experiment. The evaluation is performed by the semantic differential (SD) method with 13 adjective pairs. In the subjective experiment, we ask assessors to evaluate 40 stimuli which consist of two kinds of UDP load traffic, two kinds of fixed additional delay, five kinds of playout buffering time, and selectable or unselectable audio (i.e., MVV-SA or the previous MVV-A). As a result, MVV-SA gives higher presence to the user than MVV-A and then enhances QoE. In addition, we employ factor analysis for subjective assessment results to clarify the component factors of QoE. We then find that three major factors affect QoE in MVV-SA.
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- 2015
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15. Alterations of Regional Cerebral Blood Flow in Tinnitus Patients as Assessed Using Single-Photon Emission Computed Tomography.
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Takashi Ueyama, Tomohiro Donishi, Satoshi Ukai, Yuta Yamamoto, Takuya Ishida, Shunji Tamagawa, Muneki Hotomi, Kazuhiro Shinosaki, Noboru Yamanaka, and Yoshiki Kaneoke
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Medicine ,Science - Abstract
Tinnitus is the perception of phantom sound without an external auditory stimulus. Using neuroimaging techniques, such as positron emission tomography, electroencephalography, magnetoencephalography, and functional magnetic resonance imaging (fMRI), many studies have demonstrated that abnormal functions of the central nervous system are closely associated with tinnitus. In our previous research, we reported using resting-state fMRI that several brain regions, including the rectus gyrus, cingulate gyrus, thalamus, hippocampus, caudate, inferior temporal gyrus, cerebellar hemisphere, and medial superior frontal gyrus, were associated with tinnitus distress and loudness. To reconfirm these results and probe target regions for repetitive transcranial magnetic stimulation (rTMS), we investigated the regional cerebral blood flow (rCBF) between younger tinnitus patients (
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- 2015
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16. Analysis of the Phlebiopsis gigantea genome, transcriptome and secretome provides insight into its pioneer colonization strategies of wood.
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Chiaki Hori, Takuya Ishida, Kiyohiko Igarashi, Masahiro Samejima, Hitoshi Suzuki, Emma Master, Patricia Ferreira, Francisco J Ruiz-Dueñas, Benjamin Held, Paulo Canessa, Luis F Larrondo, Monika Schmoll, Irina S Druzhinina, Christian P Kubicek, Jill A Gaskell, Phil Kersten, Franz St John, Jeremy Glasner, Grzegorz Sabat, Sandra Splinter BonDurant, Khajamohiddin Syed, Jagjit Yadav, Anthony C Mgbeahuruike, Andriy Kovalchuk, Fred O Asiegbu, Gerald Lackner, Dirk Hoffmeister, Jorge Rencoret, Ana Gutiérrez, Hui Sun, Erika Lindquist, Kerrie Barry, Robert Riley, Igor V Grigoriev, Bernard Henrissat, Ursula Kües, Randy M Berka, Angel T Martínez, Sarah F Covert, Robert A Blanchette, and Daniel Cullen
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Genetics ,QH426-470 - Abstract
Collectively classified as white-rot fungi, certain basidiomycetes efficiently degrade the major structural polymers of wood cell walls. A small subset of these Agaricomycetes, exemplified by Phlebiopsis gigantea, is capable of colonizing freshly exposed conifer sapwood despite its high content of extractives, which retards the establishment of other fungal species. The mechanism(s) by which P. gigantea tolerates and metabolizes resinous compounds have not been explored. Here, we report the annotated P. gigantea genome and compare profiles of its transcriptome and secretome when cultured on fresh-cut versus solvent-extracted loblolly pine wood. The P. gigantea genome contains a conventional repertoire of hydrolase genes involved in cellulose/hemicellulose degradation, whose patterns of expression were relatively unperturbed by the absence of extractives. The expression of genes typically ascribed to lignin degradation was also largely unaffected. In contrast, genes likely involved in the transformation and detoxification of wood extractives were highly induced in its presence. Their products included an ABC transporter, lipases, cytochrome P450s, glutathione S-transferase and aldehyde dehydrogenase. Other regulated genes of unknown function and several constitutively expressed genes are also likely involved in P. gigantea's extractives metabolism. These results contribute to our fundamental understanding of pioneer colonization of conifer wood and provide insight into the diverse chemistries employed by fungi in carbon cycling processes.
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- 2014
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17. Discovery of a eukaryotic pyrroloquinoline quinone-dependent oxidoreductase belonging to a new auxiliary activity family in the database of carbohydrate-active enzymes.
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Hirotoshi Matsumura, Kiwamu Umezawa, Kouta Takeda, Naohisa Sugimoto, Takuya Ishida, Masahiro Samejima, Hiroyuki Ohno, Makoto Yoshida, Kiyohiko Igarashi, and Nobuhumi Nakamura
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Medicine ,Science - Abstract
Pyrroloquinoline quinone (PQQ) is a redox cofactor utilized by a number of prokaryotic dehydrogenases. Not all prokaryotic organisms are capable of synthesizing PQQ, even though it plays important roles in the growth and development of many organisms, including humans. The existence of PQQ-dependent enzymes in eukaryotes has been suggested based on homology studies or the presence of PQQ-binding motifs, but there has been no evidence that such enzymes utilize PQQ as a redox cofactor. However, during our studies of hemoproteins, we fortuitously discovered a novel PQQ-dependent sugar oxidoreductase in a mushroom, the basidiomycete Coprinopsis cinerea. The enzyme protein has a signal peptide for extracellular secretion and a domain for adsorption on cellulose, in addition to the PQQ-dependent sugar dehydrogenase and cytochrome domains. Although this enzyme shows low amino acid sequence homology with known PQQ-dependent enzymes, it strongly binds PQQ and shows PQQ-dependent activity. BLAST search uncovered the existence of many genes encoding homologous proteins in bacteria, archaea, amoebozoa, and fungi, and phylogenetic analysis suggested that these quinoproteins may be members of a new family that is widely distributed not only in prokaryotes, but also in eukaryotes.
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- 2014
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18. The putative endoglucanase PcGH61D from Phanerochaete chrysosporium is a metal-dependent oxidative enzyme that cleaves cellulose.
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Bjørge Westereng, Takuya Ishida, Gustav Vaaje-Kolstad, Miao Wu, Vincent G H Eijsink, Kiyohiko Igarashi, Masahiro Samejima, Jerry Ståhlberg, Svein J Horn, and Mats Sandgren
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Medicine ,Science - Abstract
Many fungi growing on plant biomass produce proteins currently classified as glycoside hydrolase family 61 (GH61), some of which are known to act synergistically with cellulases. In this study we show that PcGH61D, the gene product of an open reading frame in the genome of Phanerochaete chrysosporium, is an enzyme that cleaves cellulose using a metal-dependent oxidative mechanism that leads to generation of aldonic acids. The activity of this enzyme and its beneficial effect on the efficiency of classical cellulases are stimulated by the presence of electron donors. Experiments with reduced cellulose confirmed the oxidative nature of the reaction catalyzed by PcGH61D and indicated that the enzyme may be capable of penetrating into the substrate. Considering the abundance of GH61-encoding genes in fungi and genes encoding their functional bacterial homologues currently classified as carbohydrate binding modules family 33 (CBM33), this enzyme activity is likely to turn out as a major determinant of microbial biomass-degrading efficiency.
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- 2011
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19. Structural and biochemical characterization of Clostridium perfringens pili protein B collagen‐binding domains
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Eiji Tamai, Mitsugu Yamada, Takuya Ishida, Nayu Arimura, Risa Matsunami, Hiroshi Sekiya, and Shigehiro Kamitori
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Structural Biology ,Genetics ,Biophysics ,Cell Biology ,Molecular Biology ,Biochemistry - Published
- 2023
20. Symbol Grounding from Natural Conversation for Human-Robot Communication.
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Ye Kyaw Thu, Takuya Ishida, Naoto Iwahashi, Tomoaki Nakamura, and Takayuki Nagai
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- 2017
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21. Validation of a high-resolution acoustic imaging sonar method by estimating the biomass of submerged plants in shallow water.
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Katsunori Mizuno, Akira Asada, Syuhei Ban, Yoshitoshi Uehara, Takuya Ishida, and Noboru Okuda
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- 2018
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22. Photofabrication of Chiral Plasmonic Nanostructure Arrays
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Toru Homma, Naoki Sawada, Takuya Ishida, and Tetsu Tatsuma
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Biomaterials ,Renewable Energy, Sustainability and the Environment ,Materials Chemistry ,Energy Engineering and Power Technology - Published
- 2023
23. MP20-15 VALIDATION OF ARTIFICIAL INTELLIGENCE DIAGNOSTIC SUPPORT SYSTEM FOR PROSTATE NEEDLE BIOPSY
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Naoto Tokuyama, Akira Saito, Bin Shen, Ryu Muraoka, Takuya Ishida, Takeshi Kashima, Ryo Iseki, Kunihiko Yoshioka, Takashi Arakawa, Masahiko Kuroda, and Yoshio Ohno
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Urology - Published
- 2023
24. Distinctive alterations in the mesocorticolimbic circuits in various psychiatric disorders
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Yuko Nakamura, Takuya Ishida, Saori C. Tanaka, Yuki Mitsuyama, Satoshi Yokoyama, Hotaka Shinzato, Eri Itai, Go Okada, Yuko Kobayashi, Takahiko Kawashima, Jun Miyata, Yujiro Yoshihara, Hidehiko Takahashi, Ryuta Aoki, Motoaki Nakamura, Haruhisa Ota, Takashi Itahashi, Susumu Morita, Shintaro Kawakami, Osamu Abe, Naohiro Okada, Akira Kunimatsu, Ayumu Yamashita, Okito Yamashita, Hiroshi Imamizu, Jun Morimoto, Yasumasa Okamoto, Toshiya Murai, Ryu‐Ichiro Hashimoto, Kiyoto Kasai, Mitsuo Kawato, and Shinsuke Koike
- Subjects
Psychiatry and Mental health ,Neurology ,General Neuroscience ,Neurology (clinical) ,General Medicine - Published
- 2023
25. Aberrant Large-Scale Network Interactions Across Psychiatric Disorders Revealed by Large-Sample Multi-Site Resting-State Functional Magnetic Resonance Imaging Datasets
- Author
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Takuya Ishida, Yuko Nakamura, Saori C Tanaka, Yuki Mitsuyama, Satoshi Yokoyama, Hotaka Shinzato, Eri Itai, Go Okada, Yuko Kobayashi, Takahiko Kawashima, Jun Miyata, Yujiro Yoshihara, Hidehiko Takahashi, Susumu Morita, Shintaro Kawakami, Osamu Abe, Naohiro Okada, Akira Kunimatsu, Ayumu Yamashita, Okito Yamashita, Hiroshi Imamizu, Jun Morimoto, Yasumasa Okamoto, Toshiya Murai, Kiyoto Kasai, Mitsuo Kawato, and Shinsuke Koike
- Subjects
Psychiatry and Mental health - Abstract
Background and HypothesisDynamics of the distributed sets of functionally synchronized brain regions, known as large-scale networks, are essential for the emotional state and cognitive processes. However, few studies were performed to elucidate the aberrant dynamics across the large-scale networks across multiple psychiatric disorders. In this paper, we aimed to investigate dynamic aspects of the aberrancy of the causal connections among the large-scale networks of the multiple psychiatric disorders.Study DesignWe applied dynamic causal modeling (DCM) to the large-sample multi-site dataset with 739 participants from 4 imaging sites including 4 different groups, healthy controls, schizophrenia (SCZ), major depressive disorder (MDD), and bipolar disorder (BD), to compare the causal relationships among the large-scale networks, including visual network, somatomotor network (SMN), dorsal attention network (DAN), salience network (SAN), limbic network (LIN), frontoparietal network, and default mode network.Study ResultsDCM showed that the decreased self-inhibitory connection of LIN was the common aberrant connection pattern across psychiatry disorders. Furthermore, increased causal connections from LIN to multiple networks, aberrant self-inhibitory connections of DAN and SMN, and increased self-inhibitory connection of SAN were disorder-specific patterns for SCZ, MDD, and BD, respectively.ConclusionsDCM revealed that LIN was the core abnormal network common to psychiatric disorders. Furthermore, DCM showed disorder-specific abnormal patterns of causal connections across the 7 networks. Our findings suggested that aberrant dynamics among the large-scale networks could be a key biomarker for these transdiagnostic psychiatric disorders.
- Published
- 2023
26. Plasmon-Induced Photocatalysis Based on Pt–Au Coupling with Enhanced Oxidation Abilities
- Author
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Yukika Aoki, Takuya Ishida, and Tetsu Tatsuma
- Subjects
General Materials Science - Published
- 2022
27. Lytic polysaccharide monooxygenase increases cellobiohydrolases activity by promoting decrystallization of cellulose surface
- Author
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Taku Uchiyama, Takayuki Uchihashi, Takuya Ishida, Akihiko Nakamura, Josh V. Vermaas, Michael F. Crowley, Masahiro Samejima, Gregg T. Beckham, and Kiyohiko Igarashi
- Subjects
Multidisciplinary - Abstract
Efficient depolymerization of crystalline cellulose requires cooperation between multiple cellulolytic enzymes. Through biochemical approaches, molecular dynamics (MD) simulation, and single-molecule observations using high-speed atomic force microscopy (HS-AFM), we quantify and track synergistic activity for cellobiohydrolases (CBHs) with a lytic polysaccharide monooxygenase (LPMO) from Phanerochaete chrysosporium . Increasing concentrations of LPMO (AA9D) increased the activity of a glycoside hydrolase family 6 CBH, Cel6A, whereas the activity of a family 7 CBH (Cel7D) was enhanced only at lower concentrations of AA9D. MD simulation suggests that the result of AA9D action to produce chain breaks in crystalline cellulose can oxidatively disturb the crystalline surface by disrupting hydrogen bonds. HS-AFM observations showed that AA9D increased the number of Cel7D molecules moving on the substrate surface and increased the processivity of Cel7D, thereby increasing the depolymerization performance, suggesting that AA9D not only generates chain ends but also amorphizes the crystalline surface, thereby increasing the activity of CBHs.
- Published
- 2022
28. Structural connectivity between the hippocampus and cortical/subcortical area relates to cognitive impairment in schizophrenia but not in mood disorders
- Author
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Natsuko Ikeda, Shinichi Yamada, Kasumi Yasuda, Shinya Uenishi, Atsushi Tamaki, Takuya Ishida, Michiyo Tabata, Tomikimi Tsuji, Sohei Kimoto, and Shun Takahashi
- Subjects
Behavioral Neuroscience ,Neuropsychology and Physiological Psychology ,Cognitive Neuroscience - Abstract
Cognitive impairment in schizophrenia and other psychiatric disorders is a challenge to be overcome in order to maintain patients' quality of life and social function. The neurological pathogenesis of cognitive impairment requires further elucidation. In general, the hippocampus interacts between the cortical and subcortical areas for information processing and consolidation and has an important role in memory. We examined the relationship between structural connectivity of the hippocampus and cortical/subcortical areas and cognitive impairment in schizophrenia, major depressive disorder and bipolar disorder. Subjects comprised 21 healthy controls, 19 patients with schizophrenia, 20 patients with bipolar disorder and 18 patients with major depressive disorder. Diffusion-weighted tensor images data were processed using ProbtrackX2 to calculate the structural connectivity between the hippocampus and cortical/subcortical areas. Cognitive function was assessed using the Brief Assessment of Cognition in schizophrenia composite score. Hippocampal structural connectivity index was significantly correlated with composite score in the schizophrenia group but not in the healthy control, major depressive disorder or bipolar disorder groups. There were no statistically significant differences in hippocampal structural connectivity index between the four groups. Structural connectivity between the hippocampus and cortical/subcortical areas is suggested to be a pathophysiological mechanism of comprehensive cognitive impairment in schizophrenia.
- Published
- 2022
29. A new method for phosphate purification for oxygen isotope ratio analysis in freshwater and soil extracts using solid‐phase extraction with zirconium‐loaded resin
- Author
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Takuya Ishida, Hiroshi Kamiya, Yoshitoshi Uehara, Toshikuni Kato, Shogo Sugahara, Shin‐ichi Onodera, Syuhei Ban, Adina Paytan, Ichiro Tayasu, and Noboru Okuda
- Subjects
Soil ,Solid Phase Extraction ,Organic Chemistry ,Sodium Hydroxide ,Fresh Water ,Phosphorus ,Zirconium ,Oxygen Isotopes ,Spectroscopy ,Phosphates ,Analytical Chemistry - Abstract
Phosphate (POOur method comprises (1) POPOWe demonstrated the utility of ZrME for purification of PO
- Published
- 2022
30. A new sampling method with zirconium-loaded resin for phosphate oxygen isotope analysis in oligotrophic freshwater systems
- Author
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Takuya Ishida, Ichiro Tayasu, Shin‐ichi Onodera, Syuhei Ban, and Noboru Okuda
- Subjects
Rivers ,Organic Chemistry ,Water ,Phosphorus ,Zirconium ,Oxygen Isotopes ,Spectroscopy ,Ecosystem ,Analytical Chemistry ,Phosphates - Abstract
The phosphate oxygen isotope ratio (ZrClOThe adsorption/desorption experiment demonstrated that the ZrIRC resin possessed a sufficient adsorption capacity (153 μmol/resin-mL) and exhibited little isotopic fractionation during the adsorption/desorption processes. Using the PaS-Zir method, we were able to collect sufficient POWe proved that the PaS-Zir method is applicable to oligotrophic freshwater systems and is generally more efficient than the conventional method. In addition, our method is useful for improving the understanding of the P dynamics of oligotrophic ecosystems because of the extremely low concentration of PO
- Published
- 2022
31. Author response for 'A new sampling method with zirconium‐loaded resin for phosphate oxygen isotope analysis in oligotrophic freshwater systems'
- Author
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null Takuya Ishida, null Ichiro Tayasu, null Shin‐ichi Onodera, null Syuhei Ban, and null Noboru Okuda
- Published
- 2022
32. Photofabrication of chiral plasmonic nanospiroids
- Author
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Koki Shimomura, Yuma Nakane, Takuya Ishida, and Tetsu Tatsuma
- Subjects
Physics and Astronomy (miscellaneous) - Abstract
Nanofabrication of three-dimensional chiral plasmonic structures has been a challenging research topic. In the present study, we shaped dielectric caps on plasmonic gold nanocubes (AuNCs) into three-dimensional nanospiroids by circularly polarized light (CPL) as the chirality source, without using lithographic methods or chiral molecules. AuNCs adsorbed on a TiO2 substrate were irradiated with right or left CPL in the presence of Pb2+ for the deposition of PbO2 on AuNCs. The Au–PbO2 nanocomposites, thus, obtained are the first spiral plasmonic nanostructures prepared by CPL. They exhibit strong and sharp signals of circular dichroism, and the signs of the signals are reversed by changing the rotation direction of the CPL used. Their g-factor values are highest among the chiral plasmonic nanostructures fabricated by CPL.
- Published
- 2023
33. Deterioration of Tensile Properties of EPDM by Sodium Chlorite Solution and Chlorine Dioxide Solution
- Author
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Hitoshi IWABUKI, Takuya ISHIDA, and Satoshi FUKUZAKI
- Published
- 2021
34. Visualization of nano-localized and delocalized oxidation sites for plasmon-induced charge separation
- Author
-
Hiroyasu Nishi, Takuya Ishida, Tetsu Tatsuma, and Rui Ogata
- Subjects
chemistry.chemical_compound ,Delocalized electron ,Materials science ,chemistry ,Polymerization ,Nano ,General Materials Science ,Polypyrrole ,Photochemistry ,Resonance (chemistry) ,Dissolution ,Redox ,Plasmon - Abstract
Oxidation reaction sites for plasmon-induced charge separation at Au nanocubes on TiO2 were visualized on the basis of deposition and dissolution reactions. For Pb2+ oxidation, PbO2 was deposited selectively at resonance sites of the nanocube, while oxidation polymerization of pyrrole to polypyrrole and oxidative dissolution of Au took place over the entire nanocube surface. The localized and delocalized reaction sites are explained in terms of a relationship between oxidation potentials of the electron donors and potentials of the entire nanocube and localized holes.
- Published
- 2021
35. Phosphorus Enrichment in Groundwater by Legacy Phosphorus in Orchard Soils with High Phosphorus Adsorption Capacity
- Author
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Takuya Ishida, Masayuki Tamura, Sharon Bih Kimbi, Yusuke Tomozawa, Mitsuyo Saito, Yasuyuki Hirayama, Itaru Nagasaka, and Shin-ich Onodera
- Subjects
History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
36. Plasmon-Induced Charge Separation Through Asymmetric Plasmon Coupling
- Author
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Takuya Ishida and Tetsu Tatsuma
- Subjects
Materials science ,Charge separation ,business.industry ,Physics::Optics ,Electrostatic induction ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,General Energy ,Product (mathematics) ,Plasmon coupling ,Physics::Atomic and Molecular Clusters ,Optoelectronics ,Quantum efficiency ,Physical and Theoretical Chemistry ,business ,Plasmon - Abstract
External quantum efficiency of plasmon-induced charge separation (PICS) at a plasmonic nanoparticle–semiconductor interface is given as the product of the plasmonic light absorption efficiency and ...
- Published
- 2020
37. Effects of winter flooding on phosphorus dynamics in rice fields
- Author
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Tohru Ikeya, Noboru Okuda, Yoshitoshi Uehara, Takuya Ishida, Takashi F. Haraguchi, Yohei Ogino, and Satoshi Asano
- Subjects
0106 biological sciences ,Nutrient cycle ,Biodiversity ,chemistry.chemical_element ,Aquatic Science ,010603 evolutionary biology ,01 natural sciences ,Redox condition ,parasitic diseases ,Puddling ,Incubation experiment ,Periphyton ,Water Science and Technology ,Iron dynamics ,Ecology ,010604 marine biology & hydrobiology ,Aquatic ecosystem ,Phosphorus ,fungi ,food and beverages ,humanities ,Phosphorus load ,Rice field soil ,Agronomy ,chemistry ,Soil water ,Environmental science ,Paddy field ,geographic locations - Abstract
Controlling phosphorous (P) loads from rice fields is important for the conservation of aquatic ecosystems, in part because P is relatively concentrated at its sources. Recently, winter flooding, by which irrigation water is maintained in rice fields during winter, has attracted much attention as a farming strategy for environmental conservation and biodiversity maintenance. However, the effects of winter flooding on nutrient cycles have received little research attention. We evaluated the effects of winter flooding on P loads in rice fields by performing laboratory experiments with soils from rice fields with/without winter flooding. These incubation experiments showed that total and soluble reactive P concentrations in surface solutions are decreased by winter flooding. This decrease may follow co-precipitation of P with iron, which may be dissolved from winter flooded soil and rapidly precipitates in solution. Periphyton, which may increase during winter flooding, may not contribute to this decrease because puddling resets periphyton quantities on surface soils. P loads from rice fields with winter flooding over 16 days after fertilization could be reduced by an average of 26% compared with those without winter flooding, indicating that winter flooding is a valuable strategy for reducing P loads in spring when high P loads occur., This research was supported by the RIHN Project (Grant No. D06-14200119) and JSPS KAKENHI Grant Number JP19K15723.
- Published
- 2020
38. Blood supply to the caudate lobe of the liver from the right inferior phrenic artery: observation by cone-beam computed tomography during arteriography
- Author
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Shiro Miyayama, Naoko Sakuragawa, Natsuki Sugimori, Rie Ikeda, Masashi Yamashiro, and Takuya Ishida
- Subjects
medicine.medical_specialty ,Cone beam computed tomography ,Carcinoma, Hepatocellular ,Urology ,medicine.medical_treatment ,Inferior vena cava ,030218 nuclear medicine & medical imaging ,Caudate lobe of liver ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Chemoembolization, Therapeutic ,Retrospective Studies ,Radiological and Ultrasound Technology ,business.industry ,Liver Neoplasms ,Angiography ,Gastroenterology ,Cone-Beam Computed Tomography ,Hepatology ,medicine.disease ,Lobe ,medicine.anatomical_structure ,Liver ,medicine.vein ,030220 oncology & carcinogenesis ,Hepatocellular carcinoma ,Ligament ,Hepatectomy ,Tomography, X-Ray Computed ,Nuclear medicine ,business - Abstract
To retrospectively evaluate blood supply to the caudate lobe of the liver from the right inferior phrenic artery (RIPA) using cone-beam computed tomography during arteriography (CBCTA-RIPA). CBCTA-RIPA examinations during transarterial chemoembolization (TACE) for hepatocellular carcinoma (HCC) were collected from 2448 procedures in 787 patients. The exclusion criteria were (1) major artifacts, (2) TACE of hepatic arterial branches before performing CBCTA-RIPA, and (3) repeated CBCTA-RIPA studies in the same patient. Blood supply to three subsegments, the Spiegel lobe (SP), paracaval, and caudate process, was evaluated on CBCTA-RIPA images. The origins and routes of branches supplying the caudate lobe were also evaluated by three-dimensional vessel-tracking software. Forty-seven CBCTA-RIPA examinations in 47 patients (38 with a history of TACE [repeated TACE group] and nine without it [initial TACE group]) were eligible, including five who had previously undergone hepatectomy. Seven had caudate lobe HCCs. Blood supply to the caudate lobe was demonstrated in 21 (44.7%) patients: in 50% (19/38) and 22.2% (2/9) of the repeated and initial TACE groups, respectively. The caudate arteries had previously been embolized in eight patients, the RIPA branch in three, and both in one. Forty-one proximal branches mainly supplied the dorsal part of the SP. All branches but five reached there through the inferior vena cava (IVC) ligament. The RIPA supplied eight of nine caudate lobe HCCs, totally (n = 7) or partially (n = 1). The proximal RIPA branches mainly supply the dorsal SP through the IVC ligament, especially in the repeated TACE group.
- Published
- 2020
39. Factors characterizing phosphate oxygen isotope ratios in river water: an inter-watershed comparison approach
- Author
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Masanori Akashi, Jun’ichiro Ide, Abigail P. Cid-Andres, Noboru Okuda, Takuya Ishida, Ichiro Tayasu, Takuya Hayashi, Ken'ichi Osaka, Adina Paytan, and Tomoya Iwata
- Subjects
0106 biological sciences ,Physics ,Crystallography ,Ecology ,010604 marine biology & hydrobiology ,Aquatic Science ,010603 evolutionary biology ,01 natural sciences ,River water ,Isotopes of oxygen ,Water Science and Technology ,Watershed scale ,Accretionary complex - Abstract
We compared the oxygen isotope ratio of dissolved phosphate $$\left( {\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }} } \right)$$ in two rivers with different land-cover and geological features (Ado River and Yasu River) within Lake Biwa basin, central Japan, to explore what factor primarily characterizes the $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ . Mean values of $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ in river water were 19.0 ± 2.4‰ (n = 7) in Ado River and 13.1 ± 2.3‰ (n = 15) in Yasu River, which were significantly different. Comparisons of $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ between river water and potential sources of phosphate revealed that in the Ado River, the $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ was similar to that in rocks from the accretionary complex and decreased with increasing sedimentary rock coverage. In the Yasu River, the $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ was low in the upper forested areas, but increased with paddy field coverage. These results demonstrate that river $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ strongly reflects inputs from geological substances, but is also impacted by land-use activities and varies with anthropogenic land coverage in the watershed. Thus, river $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ relates to land or bedrock coverage differentially in each river. Regression analysis showed that residuals of the $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ tended to converge to zero with increasing drainage area, suggesting that river $$\delta^{{{18}}} {\text{O}}_{{{\text{PO}}_{{4}} }}$$ more explicitly reflects land-cover and geological features on a larger watershed scale.
- Published
- 2020
40. Oxidative Reaction Energy in Photopolymerization Inspired by Plasmon-Induced Charge Separation
- Author
-
Takuya Ishida, Yoshitaka Furukawa, Sunao Yamada, Yukina Takahashi, and Yusuke Sota
- Subjects
Materials science ,Charge separation ,Substrate (chemistry) ,Reaction energy ,02 engineering and technology ,Oxidative phosphorylation ,Electrostatic induction ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,General Energy ,Photopolymer ,chemistry ,Phenol ,Physical and Theoretical Chemistry ,0210 nano-technology ,Plasmon - Abstract
Nanopolymerization based on plasmon-induced charge separation (PICS) was performed on a gold nanoparticle-deposited TiO2 substrate. Phenol and 3,4-ethylenedioxythiophene, which have different oxida...
- Published
- 2020
41. Intraoperative Bile Duct Disruption Treated Using Intrahepatic Biliary Ablation with Ethanol: A Report of Two Cases
- Author
-
Natsuki Sugimori, Masashi Yamashiro, Naoko Sakuragawa, Takuro Terada, Shiro Miyayama, Takuya Ishida, and Rie Ikeda
- Subjects
medicine.medical_specialty ,chemistry.chemical_compound ,medicine.anatomical_structure ,Ethanol ,chemistry ,business.industry ,Bile duct ,Iodized oil ,medicine.medical_treatment ,Urology ,Medicine ,business ,Ablation - Published
- 2020
42. Transarterial Interventional Therapy for Non-functioning Hemodialysis Access
- Author
-
Rie Ikeda, Tamayo Kato, Shiro Miyayama, Natsuki Sugimori, Masashi Yamashiro, Takuya Ishida, Yasuyuki Ushiogi, Yasutaka Kamikawa, and Naoko Sakuragawa
- Subjects
Interventional therapy ,medicine.medical_specialty ,Thrombotic occlusion ,business.industry ,Transarterial approach ,Medicine ,business ,Hemodialysis access ,Surgery - Published
- 2020
43. Assessment of long-term phosphorus budget changes influenced by anthropogenic factors in a coastal catchment of Osaka Bay
- Author
-
Kunyang Wang, Shin-ichi Onodera, Mitsuyo Saito, and Takuya Ishida
- Subjects
Soil ,Environmental Engineering ,Bays ,Anthropogenic Effects ,Environmental Chemistry ,Agriculture ,Phosphorus ,Fertilizers ,Pollution ,Waste Management and Disposal ,Environmental Monitoring - Abstract
Phosphorus usage is irreplaceable in agriculture; however, its excessive use leads to wastage of invaluable resources and significant soil surplus. Agronomic soil phosphorus surplus in Asian regions has a much higher level than the global average. And with rapid urbanization and population growth in the recent decades, Asian countries have seen a rise in environmental pollution levels also. This study assessed the detailed phosphorus budget in the Yamato River catchment, an urbanized coastal catchment in Asia, from 1940s to 2010s using Soil and Water Assessment Tool, comprehensively analyzed the effect of anthropogenic factors on long-term phosphorus loading and agronomic soil phosphorus balance. The results showed the peak period of total phosphorus loading and agronomic soil phosphorus surplus occurred in 1970s, at 895 tons/year and 36.6 kg/ha, respectively. The major reasons for increased phosphorus loading and soil surplus during 1940-1970 were rapid population growth and increased fertilizer usage, respectively. Since the 1980s, the construction of wastewater treatment system and reduction in agricultural land contributed to environmental improvement. These anthropogenic factors had a much stronger impact on phosphorus budget than climate change in the study catchment. Soil phosphorus balance is affected by a combination of factors, such as soil properties, fertilizer usage and applied schedule, precipitation event, and crop types. And soil phosphorus surplus may be severely overestimated if the non-point source loss due to precipitation factor is not fully considered.
- Published
- 2022
44. Two-dimensional arrays of plasmonic metal nanoparticles prepared by bottom up methods for sensing and photoelectrochemical applications
- Author
-
Yukina Takahashi, Takuya Ishida, and Sunao Yamada
- Subjects
symbols.namesake ,Materials science ,business.industry ,Colloidal gold ,symbols ,Optoelectronics ,Surface plasmon resonance ,business ,Metal nanoparticles ,Plasmon ,Raman scattering - Abstract
We developed two-dimensional arrays of larger plasmonic metal nanoparticles than before by employing bottom up methods and investigated their plasmonic properties for sensing and photoelectrochemical applications. From surface enhanced Raman scattering (SERS) measurements, we found that the array consisting of gold nanoparticles with the diameter of 50 nm exhibited larger enhancement effects than that of 15 nm.
- Published
- 2021
45. (Invited) Photoelectrochemical Fabrication of Chiral Plasmonic Nanostructures By Circularly Polarized Light
- Author
-
Tetsu Tatsuma, Takuya Ishida, and Hiroyasu Nishi
- Abstract
Chiral plasmonic nanostructures attracts attention because they are potentially applicable to optical materials such as enantioselective sensors and metamaterials, as well as photoelectrochemical devices. Chiral nanostructures are often prepared by electron beam lithography or synthesis based on DNA templates. We have recently developed a photoelectrochemical method, in which handedness of the chiral nanostructure can be controlled by right- or left- circularly polarized light. The photoelectrochemical method is based on plasmon-induced charge separation (PICS),1,2 in which electrons are injected from a plasmonic metal nanoparticle to a semiconductor such as titania in direct contact. In PICS, anodic reactions often occur at the resonance sites of the plasmonic nanoparticle, at which electron oscillation is localized.3,4 Energetic electron-hole pairs generate at the resonance site, and holes are used for the local anodic reaction, probably via trap sites. On the basis of the mechanisms, we have demonstrated site-selective etching of silver nanoparticles and site-selective deposition of lead oxide on gold nanoparticles. Under right-circularly polarized light (CPL), distribution of the resonance sites could be the mirror image of that under left-CPL.5 Therefore, we performed site-selective deposition of lead oxide on gold nanocuboids on titania under right- or left-CPL.6 As a result, lead oxide was deposited on the gold nanocuboids in a chiral geometry. The nanostructures thus obtained exhibited circular dichroism (CD), and the CD spectrum obtained for the structure prepared under right-CPL was opposite to that obtained for the structure prepared under left-CPL. Reversible switching of the handedness of the chiral plasmonic nanostructures can also be possible.7 This method also allows us to fabricate spiral nanostructures. 1. Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005). 2. T. Tatsuma, H. Nishi, and T. Ishida, Chem. Sci., 8, 3325 (2017) [review]. 3. I. Tanabe and T. Tatsuma, Nano Lett., 12, 5418 (2012). 4. T. Tatsuma and H. Nishi, Nanoscale Horiz., 5, 597 (2020) [review]. 5. S. Hashiyada, T. Narushima, and H. Okamoto, J. Phys. Chem. C, 118, 22229 (2014). 6. K. Saito and T. Tatsuma, Nano Lett., 18, 3209 (2018). 7. K. Morisawa, T. Ishida, and T. Tatsuma, ACS Nano, 14, 3603 (2020).
- Published
- 2022
46. Rice paddy irrigation seasonally impacts stream benthic macroinvertebrate diversity at the catchment level
- Author
-
Ellis Mika C. Triño, Chia-Ying Ko, Tohru Ikeya, Takuya Ishida, Tomoya Iwata, Meng-Ju Lin, Yoshitoshi Uehara, Ichiro Tayasu, Elfritzson Martin Peralta, Satoshi Asano, and Noboru Okuda
- Subjects
Hydrology ,Irrigation ,geography ,geography.geographical_feature_category ,Land use ,Ecology ,Drainage basin ,land use ,structural equation modeling ,Benthic zone ,catchment and watershed management ,rice paddy ,Environmental science ,Paddy field ,Ecology, Evolution, Behavior and Systematics ,benthic macroinvertebrates ,QH540-549.5 ,Diversity (business) - Abstract
Agriculture is one of the most critical anthropogenic disturbances to freshwater ecosystems globally. In monsoon Asia, rice paddies provide habitats for aquatic species, but how their associated irrigation systems can affect downstream ecosystems is poorly understood. Here, we used structural equation modeling (SEM) to estimate seasonal variations in benthic macroinvertebrate diversity and environments and quantified indirect effects of land use, especially of rice paddy areas, on benthic macroinvertebrate diversity through local environmental alteration. Our study site was the Yasu River tributary of Lake Biwa, Japan, and we performed our investigation during both irrigation and nonirrigation periods, representing different seasons. Seasonal variations in physical and chemical variables and diversity were observed. Seasonal particulate phosphorus concentrations to a large extent determined the abundance and community composition of benthic macroinvertebrates. SEM revealed that the proportions of forest, urban, and rice paddy areas in the catchment had significant indirect effects on biodiversity indices of local benthic macroinvertebrate communities. The proportion of forest area had robust negative effects on water temperature, but the overall indirect effects on the macroinvertebrate diversity contrasted between the two seasonal periods. The proportion of rice paddy area had a strongly negative indirect effect on the diversity through increased particulate phosphorous loading during the irrigation period, while the proportion of urban area had a significantly negative indirect effect during the nonirrigation period only. The seasonal negative impacts of rice paddy irrigation on benthic macroinvertebrate communities were possibly due to siltation arising from rice paddy soils. Our results have implications for environmental restoration and biodiversity conservation in catchment management.
- Published
- 2021
47. Response of river water chemistry to changing atmospheric environment and sulfur dynamics in a forested catchment in central Japan
- Author
-
Shigeki Uchiyama, Ichiro Tayasu, Chisato Takenaka, Toshiro Yamada, Takanobu Inoue, Takumi Saito, Takuya Ishida, Haruo Fukuhara, Toko Tanikawa, Kazuhide Matsuda, Tomoyuki Hakamata, Seiichi Ohta, Masamichi Takahashi, Masato Kamisako, Masayuki Morohashi, Keiichi Sato, Naoyuki Yamashita, Hiroyuki Sase, Tsuyoshi Ohizumi, Shinji Kaneko, Takanori Nakano, and Ryo Kobayashi
- Subjects
geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Drainage basin ,chemistry.chemical_element ,04 agricultural and veterinary sciences ,Atmospheric sciences ,01 natural sciences ,Nitrogen ,Atmosphere ,δ34S ,Deposition (aerosol physics) ,chemistry ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental Chemistry ,Terrestrial ecosystem ,Groundwater ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology ,Isotope analysis - Abstract
Reduction of atmospheric sulfur (S) deposition and recovery of terrestrial ecosystems from acidification are matters of concerns in Asia. The Lake Ijira catchment (IJR) is located in the downwind region of the Chukyo Industrial Area in central Japan and has historically experienced large-scale deposition of S and nitrogen (N) from the atmosphere. Long-term monitoring data on the river water (RW) chemistry since 1988 were assessed with intensive-survey datasets on the input–output material budgets and S isotopic analysis (δ34S). Previous studies have suggested that IJR was acidified and N-saturated, which was triggered by climatic anomalies (cold summer and drought summer) in the mid-1990s. Analysis shows that with a decline in $$ {\text{NO}}_{3}^{ - } $$ concentrations, RW pH recovered to its original level in the early 2000s. Reductions in atmospheric deposition, diminished effects of climatic anomalies, and forest management practices, have all contributed to RW chemistry recovery. Although the $$ {\text{SO}}_{4}^{2 - } $$ concentration in the RW has declined continuously after the peak in 1994, the mean $$ {\text{SO}}_{4}^{2 - } $$ output significantly exceeded the input; the 5-year means from 2010 to 2014 are 2.5 kmolc ha−1 year−1 and 0.86 kmolc ha−1 year−1, respectively. The mean δ34S values of $$ {\text{SO}}_{4}^{2 - } $$ in rainwater and soil solution at 20 cm depth were 4.3 ‰ and 3.5 ‰, respectively, and that in the RW was −13.2‰. The contributions of groundwater S to the RW S were estimated to range from 75 to 91%. Geological S with significantly low δ34S values largely contributed to the discrepancy of the input–output budget, while atmospheric S appeared to accumulate in soil as organic S. The tree-ring δ34S profile recorded historical changes in the atmospheric inputs in the region. With recovery of the RW, the relative contribution of atmospheric S became smaller. However, most of the atmospheric S is still retained in soil. Over the last few decades, RW chemistry has sensitively responded to changes in the atmospheric environment, including the atmospheric deposition of S and N and climatic anomalies, and as future changes are likely, long-term monitoring is essential.
- Published
- 2019
48. Effect of Plasmon Coupling on Quantum Efficiencies of Plasmon-Induced Charge Separation
- Author
-
Tetsu Tatsuma and Takuya Ishida
- Subjects
Materials science ,Charge separation ,Physics::Optics ,02 engineering and technology ,Electrostatic induction ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Molecular physics ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,General Energy ,Physics::Plasma Physics ,Plasmon coupling ,Electric field ,Physics::Atomic and Molecular Clusters ,Quantum efficiency ,Physical and Theoretical Chemistry ,0210 nano-technology ,Quantum ,Intensity (heat transfer) ,Plasmon - Abstract
To clarify effects of plasmonic electric field intensity and distributions on the internal quantum efficiency (IQE) of plasmon-induced charge separation (PICS), we took advantage of interparticle p...
- Published
- 2018
49. Plasmonic–Diffractive Hybrid Sensors Based on a Gold Nanoprism Array
- Author
-
Tsutomu Shimura, Takuya Ishida, Kazutaka Akiyoshi, Tetsu Tatsuma, and Yoshito Tanaka
- Subjects
Diffraction ,Materials science ,business.industry ,Physics::Optics ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Wavelength ,Electric field ,Lattice (order) ,Optoelectronics ,General Materials Science ,Surface plasmon resonance ,0210 nano-technology ,business ,Refractive index ,Plasmon - Abstract
In order to improve the performance of localized surface plasmon resonance (LSPR) sensors, lattice plasmons of plasmonic nanoparticle (NP) arrays are often used. The lattice plasmon sensors based on coupling between LSPR of each NP and diffraction of the NP array generally have a higher ability to detect local refractive index changes than conventional LSPR sensors based on random NP ensembles. However, the surface selectivity of the lattice plasmon sensors is lower than that of the LSPR sensors because the local electric field of the former extends far from the particle array surface. In this work, we develop a novel plasmonic–diffractive hybrid sensor that can simultaneously determine both local and bulk refractive indices from two output signals, namely, extinction dip and peak, the wavelengths of which are differently dependent on those indices. The hybrid sensor can evaluate the refractive index changes in the immediate vicinity of the sensor surface by canceling the difference in the bulk refractive...
- Published
- 2018
50. Multidimensional QoE Assessment of Multi-view Video and Selectable Audio (MVV-SA) IP Transmission.
- Author
-
Takuya Ishida and Toshiro Nunome
- Published
- 2013
- Full Text
- View/download PDF
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