38 results on '"Ehren R"'
Search Results
2. "Is he my boss? I don’t know”: The (Ambiguous) Role of the Sport Supervisor in NCAA Division I Intercollegiate Athletics.
- Author
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Green, Ehren R. and Hancock, Meg G.
- Abstract
Behind every intercollegiate athletic team is an often-unknown athletic administrator known as the sport supervisor (sport administrator). As middle managers, these administrators are key organizational connectors, connecting the individual team(s) to the department, and are vital to organizational success. Understanding the role of sport supervisor is crucial to the success of athletic departments. Thus, the purpose of this study was to define and understand the role of the sport supervisor in NCAA division I intercollegiate athletics utilizing role theory. Through a descriptive phenomenological approach, 22 participants (11 sport supervisors and 11 head coaches) from NCAA Division I institutions were interviewed. The findings from this study illuminate the complexity of the role of a sport supervisor as well as the lack of clarity around what the role is, who sets the expectations, and how the expectations align between a sport supervisor and head coach. The lack of clarity with the role can lead to role stress for both sport supervisors and head coaches as well as negatively impact organizations. This study provides a formal definition and understanding of the critical role of the sport supervisor in intercollegiate athletics helping bring clarity and guidance to practitioners and scholars. [ABSTRACT FROM AUTHOR]
- Published
- 2023
3. Organizational Supports and Developing a Healthy Workforce
- Author
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Andrew McCart, Matt Bergman, Ehren R. Green, and Kevin Rose
- Subjects
Anesthesiology and Pain Medicine - Abstract
This case study seeks to understand workplace wellness activities in organizations in Southern Indiana and Greater Louisville. Utilizing the Center for Disease Control (CDC) Workplace Wellness Health Scorecard, a 125-question survey that covers a diverse set of workplace wellness initiatives, twenty-four organizations participated in the study, with one to four participants from each organization. This study looks at the question of context and how an organization’s supports impacts the health of their workforce. The results found that leveraging the knowledge of experts, implementing a variety of wellness programs, removing obstacles to wellness, and having a caring attitude toward employees lead to a higher score regarding organizational supports on the CDC Health Scorecard.
- Published
- 2022
- Full Text
- View/download PDF
4. Defining the Presence of Misrecognition in Multilingual Organizations
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Erin Mires, Matt Bergman, Ehren R. Green, and Kevin Rose
- Subjects
Anesthesiology and Pain Medicine - Abstract
Research indicates the multilingual aspects of organizations can create power divisions and rules that drive workplace practices. From an international human resources development perspective, language management is strategic and planned through the headquarters of the organization. Yet the rational ideas of organizational members are what are truly valued in multilingual workplaces. These rational ideas create power struggles and biases that are formed against individuals who possess certain linguistic capabilities, regardless of the individual’s other traits or accomplishments. These biases have been labeled the phenomenon of misrecognition. This literature review explores the presence of misrecognition in multilingual organizations. A need to determine how the phenomenon of misrecognition exists in multilingual organizations was discovered.
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- 2022
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- View/download PDF
5. First Report of Fungal Endophyte Communities and Non-Defensive Phytochemistry of Biocontrol-Inoculated Whitebark Pine Seedlings in a Restoration Planting
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Moler, Ehren R. V., primary, Reinhardt, Keith, additional, Sniezko, Richard A., additional, and Aho, Ken, additional
- Published
- 2022
- Full Text
- View/download PDF
6. A novel interventional pain simulation-based education curriculum: Implementation to enhance procedural training
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Danielle L. Sarno, Robert J. Yong, Kara G. Fields, Susan M. Lim, Christopher J. Gilligan, Lyba Khan, and Ehren R. Nelson
- Published
- 2022
- Full Text
- View/download PDF
7. Inadequate Dosage of Mycophenolate Mofetil Is Likely to Yield Substandard Trial Results and Substandard Patient Care
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Schreuder, M.F., Ehren, R., Weber, L.T., Schreuder, M.F., Ehren, R., and Weber, L.T.
- Abstract
Item does not contain fulltext
- Published
- 2021
8. Therapeutic drug monitoring of mycophenolate mofetil in pediatric patients: novel techniques and current opinion
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Ehren, R., Schijvens, A.M., Hackl, A., Schreuder, M.F., Weber, L.T., Ehren, R., Schijvens, A.M., Hackl, A., Schreuder, M.F., and Weber, L.T.
- Abstract
Contains fulltext : 231550.pdf (Publisher’s version ) (Closed access), Introduction: Mycophenolate mofetil (MMF) is an ester prodrug of the immunosuppressant mycophenolic acid (MPA) and is recommended and widely used for maintenance immunosuppressive therapy in solid organ and stem-cell transplantation as well as in immunological kidney diseases. MPA is a potent, reversible, noncompetitive inhibitor of the inosine monophosphate dehydrogenase (IMPDH), a crucial enzyme in the de novo purine synthesis in T- and B-lymphocytes, thereby inhibiting cell-mediated immunity and antibody formation. The use of therapeutic drug monitoring (TDM) of MMF is still controversial as outcome data of clinical trials are equivocal. Areas covered: This review covers in great depth the existing literature on TDM of MMF in the field of pediatric (kidney) transplantation. In addition, the relevance of TDM in immunological kidney diseases, in particular childhood nephrotic syndrome is highlighted. Expert opinion: TDM of MMF has the potential to optimize therapy in pediatric transplantation as well as in nephrotic syndrome. Limited sampling strategies to estimate MPA exposure increase its feasibility. Future perspectives rather encompass approaches reflecting total immunosuppressive load than single drug TDM.
- Published
- 2021
9. First Report of Fungal Endophyte Communities and Non-Defensive Phytochemistry of Biocontrol-Inoculated Whitebark Pine Seedlings in a Restoration Planting
- Author
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Ehren R. V. Moler, Keith Reinhardt, Richard A. Sniezko, and Ken Aho
- Subjects
fungi ,food and beverages ,Pinus albicaulis ,Cronartium ribicola ,Paramyrothecium roridum ,fungal endophyte ,biocontrol inoculation ,phytochemistry ,Forestry - Abstract
Plant endosymbionts (endophytes) influence host plant health and express genotype-dependent ecological relationships with plant hosts. A fungal species intended to confer host plant resistance to a forest pathogen was used as inoculum to test for effects of inoculation on disease resistance, microbiomes, and phytochemistry of a threatened pine species planted in a restoration setting. Correlations of inoculation presence/absence, phytochemistry, spatial location of seedlings, maternal seed sources, and fungal endophytic communities in the foliage of six-year-old whitebark pine (Pinus albicaulis) seedlings were assessed five years after an experimental inoculation of seedlings with foliar endophytic fungi cultured from whitebark pine trees at Crater Lake National Park, including Paramyrothecium roridum. We hypothesized that P. roridum would modify host microbiomes in a manner that combats white pine blister rust disease. Our assessment of seedlings in the field five years after inoculation allowed us to consider whether inoculation stimulated long-lasting changes in microbiome communities and whether effects varied by seedling genetic family. Tests for effects of endophyte inoculation on disease resistance were inconclusive due to current low levels of rust infection observed at the field site. Foliar fungal endophyte richness and Shannon diversity varied with maternal seed sources. Isotopic stoichiometry and phytochemistry did not vary with seedling spatial proximity, inoculation treatment, or maternal seed family. However, endophyte community composition varied with both seedling spatial proximity and maternal seed sources. Endophytic communities did not vary with the inoculation treatment, and the hypothesized biocontrol was not detected in inoculated seedlings. We draw three conclusions from this work: (1) fungal microbiomes of whitebark pine seedlings across our study site did not vary with host phytochemical signatures of ecophysiological status, (2) the inoculation of P. albicaulis seedlings with a mixture of fungal endophytes did not lead to persistent systemic changes in seedling foliar microbiomes, and (3) in correspondence with other studies, our data suggest that maternal seed source and spatial patterns influence fungal endophyte community composition.
- Published
- 2022
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10. Predicting Postoperative Pain: A Complex Interplay of Multiple Factors
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Nelson, Ehren R., primary, Gan, Tong J., additional, and Urman, Richard D., additional
- Published
- 2021
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11. Is Same-Gender Mentorship Important for Division III Female College Athletes?: An Application of the Mentor Role Theory.
- Author
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Swim, Nicholas, Bower, Glenna G., Green, Ehren R., Hums, Mary, and Walker, Khirey B.
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MENTORING ,COLLEGE athletes ,COLLEGE sports ,MENTORS - Abstract
In the last 20 years, opportunities for women in intercollegiate athletics have grown exponentially. Unfortunately, women still represent a small number of head coaches in intercollegiate athletics, creating a disparity in numbers between female college athletes and female head coaches. This disparity has led to an imbalance for female college athletes searching for female role models and mentors. This study investigated the mentoring experiences of NCAA Division III female college athletes based on their lived experiences with both male and female head coaches. Using Mentor Role Theory (MRT), a set of qualitative responses were collected and analyzed. The participants highlighted career and psychosocial functions of MRT, with responses emphasizing positive and negative experiences with their past and present head coaches. Overall, female college athletes noted the importance of both career and psychosocial functions in their experiences with both male and female coaches. However, the college athletes' experiences with their female head coaches predominately were positive, whereas the participants were found to hold mixed experiences (both positive and negative) with their male coaches. The authors discuss the implications of these findings for Division III athletics, mentor role theory, and the importance of the coach/athlete relationship. [ABSTRACT FROM AUTHOR]
- Published
- 2022
12. The quest for optimal control of relapses in children with nephrotic syndrome
- Author
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Schijvens, A.M., Ehren, R., Weber, L.T., Schreuder, M.F., Schijvens, A.M., Ehren, R., Weber, L.T., and Schreuder, M.F.
- Abstract
Item does not contain fulltext
- Published
- 2019
13. Nephrotic syndrome in childhood and adolescence. Summary of the AWMF guidelines considering special aspects of diagnostics and treatment in adults
- Author
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Ehren, R., Brinkkoetter, P., Weber, L. T., Querfeld, U., Ehren, R., Brinkkoetter, P., Weber, L. T., and Querfeld, U.
- Abstract
Background. Despite fulfilling the criteria for an orphan disease, idiopathic nephrotic syndrome (NS) in children is the most frequent glomerular disease in this age group. At the same time NS in children is aheterogeneous disease and in order to assess the individual facets of the disease aclassification using the following criteria is helpful: etiology, age at onset, histology and responsiveness to initial standard treatment with glucocorticoids. As for prognosis the differentiation between steroid-sensitive (SSNS) and steroid-resistant nephrotic syndromes (SRNS) is most important because SRNS is arisk factor for developing end-stage renal disease. High cumulative doses of glucocorticoids or prolonged administration in the initial treatment do not influence the risk of a relapse. Genetic testing is highly advisable in patients with SRNS to avoid unnecessary and ineffective immunosuppressive therapy. Methods. This manuscript gives an overview on the management of SSNS and SRNS and provides insights into the different diagnostic and therapeutic approaches in pediatric and adult medicine. Furthermore, associated risks and potential long-term side effects of treatment are described. Conclusion. Frequently relapsing NS and SRNS are still challenging to treat. The use of steroids and immunosuppressive maintenance therapy has severe long-term side effects. The optimal treatment of adult patients with childhood onset SSNS and infrequent relapses remains unclear.
- Published
- 2019
14. Nephrotic syndrome in childhood
- Author
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Benz, M. R., Ehren, R., Toenshoff, B., Weber, L. T., Benz, M. R., Ehren, R., Toenshoff, B., and Weber, L. T.
- Abstract
Despite fulfilling the criteria for an orphan disease, idiopathic nephrotic syndrome in children is the most frequent glomerular disease in this age group. Nephrotic syndrome is defined by the detection of a high proteinuria (>1g/m(2) body surface area daily) and hypoalbuminemia (<2,5 g/dl). Edema is also mostly present, especially at the first manifestation. Nephrotic syndrome in children is a heterogeneous disease with respect to age of onset, etiology, histological alterations and response to a standard treatment of glucocorticoids. This diversity strongly influences both the differential diagnostic approach and the treatment. As the prognosis of steroid-sensitive nephrotic syndrome with respect to renal function is generally good, not only the efficacy of an immunosuppressive medication but also the side effect profiles of different immunosuppressive regimens should be kept in mind for treatment planning and optimization.
- Published
- 2019
15. Mycophenolate Mofetil and Levamisole for the Treatment of frequent Relapsing of idiopathic nephrotic Syndrome - Are they new Aspects?
- Author
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Ehren, R. and Ehren, R.
- Published
- 2019
16. An Examination of College Adaptive Sport Sponsorship and the Role of Cause-Related Marketing.
- Author
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Siegfried, Nina, Green, Ehren R., Swim, Nicholas, Montanaro, Anthony, Greenwell, Chris, and Frederick, Evan L.
- Abstract
Despite the growth of college sports as a whole, college adaptive sport programs are still relatively scarce. Even more scarce are the resource college adaptive sport programs receive from their institutions and athletic departments, making sponsorship funding essential for operation. Using a Delphi approach, this study examined the unique attributes college adaptive sports possess to identify how these programs are acquiring sponsors. First, ten interviews with college adaptive sport professional were conducted to identify key categories regarding unique program characteristics, sponsorship acquisition, and barriers, followed by a survey in which eleven participants ranked the importance of each category. Findings show college adaptive sports unique characteristics include serving an underserved population, impacting the disability community, and positively impacting the lives of student-athletes beyond college, which are attractive to sponsors looking to engage in CRM. Existing network channels and community relationships are key to sponsorship acquisition, as well as, providing tangible deliverables for sponsors looking to quantify their engagement. The results provide strategies for current and future college adaptive sport programs to acquire their own funding through sponsorship, in order to supplement scarce university and athletic department funding. [ABSTRACT FROM AUTHOR]
- Published
- 2021
17. iPads in action: an investigation into how the use of iPads can help improve Year 7 student engagement and attainment in a secondary grammar school
- Author
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Ehren, R
- Subjects
Education - Abstract
Digital technologies continue to increase in their popularity and use throughout all forms of education. In recent times windows devices with keyboards have been most popular in many schools but there may now be a shift towards using tablet devices. Therefore, it is important to ask what is the impact upon student engagement and attainment within computing of using iPads? In a selective girls grammar school, where all students in Years 7 to 9 had access to a netbook previously, this investigation looked at the implications of the move away from netbooks to iPads instead. It considered how the use of iPads could alter students’ engagement with regards to their learning and whether there are any benefits to attainment within computing lessons where they already have access to more traditional digital technologies. The investigation was carried out via an online survey which was completed by those students in Year 7 with access to an iPad. Once the survey had been completed 2 small focus groups were then selected and interviewed so as to further investigate the findings from the survey responses. Using computing as a case study, this investigation also considered the implications the use of iPads had on attainment. During this investigation is was discovered that the use of iPads did increase student engagement. There were a number of different reasons why students felt that the inclusion and use of iPads in their lessons increased their attainment. These included more competitiveness, increased independence speed and ease of use. The results found indicated that there were some benefits to student attainment in computing due to the use of iPads. These benefits were seen with regards to the value added results of the students in the study.
- Published
- 2017
18. STEROID WITHDRAWAL WITHIN THE FIRST YEAR AFTER PEDIATRIC KIDNEY TRANSPLANTATION - ELEVATED RISK FOR THE DEVELOPMENT OF DE NOVO DONOR-SPECIFIC ANTIBODIES (DNDSA) AND ACUTE REJECTION EPISODES (ARE)?
- Author
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Klein, H., Volland, R., Ehren, R., Habbig, S., Liebau, M. C., Nuesken, K. D., Taylan, C., Weber, L. T., Klein, H., Volland, R., Ehren, R., Habbig, S., Liebau, M. C., Nuesken, K. D., Taylan, C., and Weber, L. T.
- Published
- 2017
19. Extrarenal Manifestations in Shigatoxin-associated Haemolytic Uremic Syndrome
- Author
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Matthies, J., Huenseler, C., Ehren, R., Volland, R., Koerber, F., Hoppe, B., Weber, L. T., Habbig, S., Matthies, J., Huenseler, C., Ehren, R., Volland, R., Koerber, F., Hoppe, B., Weber, L. T., and Habbig, S.
- Abstract
Background: Shigatoxin-associated haemolytic uremic syndrome (STEC-HUS) is the most frequent cause of acute kidney injury in children worldwide. Extrarenal manifestations are the main determinants for both, short- and long-term prognosis of patients with STEC-HUS. Patients: 46 patients treated over the last 10 years for STEC-HUS in a single center. Methods: This retrospective study analysed the incidence and outcome of extrarenal manifestations in our cohort of children with STEC-HUS. Risk factors for extrarenal involvement and adverse outcome were assessed by detailed chart review. Results: Eleven extrarenal manifestations occurred in 9/46 patients comprising 8 neurological, 2 gastro-intestinal, and 1 cardiovascular complication. One patient died from cerebral bleeding. Liver transplantation was required in a girl 18 months after HUS due to secondary sclerosing cholangitis. Patients with extrarenal manifestations were significantly younger and presented with higher leucocyte counts and higher alanine aminotransferase levels at admission. Renal replacement therapy was necessary for a longer period than in patients without extrarenal complications. Conclusion: Extrarenal manifestations occurred in about 20% of our patients with STEC-HUS. The identification of risk-factors will help to provide a better management of these patients which might also include novel treatment strategies like complement inhibition.
- Published
- 2016
20. Alternatives to steroid treatment of steroid-sensitive nephrotic syndrome in childhood
- Author
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Benz, M. R., Ehren, R., Toenshoff, B., Weber, L. T., Benz, M. R., Ehren, R., Toenshoff, B., and Weber, L. T.
- Abstract
Background. Despite being an orphan disease, idiopathic nephrotic syndrome in childhood is the most frequent glomerular disease in this age group. Nephrotic syndrome in children is a heterogeneous disease and in order to assess the individual facets of the disease a classification using the following criteria are helpful: etiology, age at onset, histology and responsiveness to initial standard treatment with glucocorticoids. Most important is the differentiation between steroid-sensitive (SSNS) and steroid-resistant nephrotic syndromes (SRNS) because SRNS is a risk factor for developing end-stage renal disease. Conclusion. A high cumulative dosage of glucocorticoids and prolonged intake do not seem to impact on the risk of relapse. In order to avoid short and long-term glucocorticoid-associated side effects alternative treatment options should be kept in mind when planning individual treatment options, especially with mycophenolate mofetil, calcineurin inhibitors and rituximab in patients with frequently relapsing disease. Genetic diagnostics aremandatory in patients with SRNS; however, immunosuppressive treatment in children with genetic forms of nephrotic syndrome rarely leads to remission.
- Published
- 2015
21. Plant developmental stage influences responses of Pinus strobiformis seedlings to experimental warming
- Author
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Ehren Reid Von Moler, Thomas Kolb, Anne Brady, Briana Nicole Palmiero, Taylor Robert Wallace, Kristen Marie Waring, and Amy Vaughn Whipple
- Subjects
acclimation ,chlorophyll fluorescence ,climate change ,embryogenesis ,growth tradeoffs ,heat wave ,Environmental sciences ,GE1-350 ,Botany ,QK1-989 - Abstract
Abstract Seedling emergence, survival, morphological and physiological traits, and oxidative stress resistance of southwestern white pine (Pinus strobiformis Engelm.) were studied in response to warming treatments applied during embryogenesis, germination, and early seedling growth. Daytime air temperature surrounding cones in tree canopies was warmed by +2.1°C during embryo development. Resulting seeds and seedlings were assigned to three thermal regimes in growth chambers, with each regime separated by 4°C to encompass the wide range of temperatures observed over space and time across the species’ range, plus the effect of heat waves coupled with a high carbon emissions scenario of climate warming. The embryo warming treatment reduced percent seedling emergence in all germination and growth environments and reduced mortality of seedlings grown in the warmest environment. Warm thermal regimes during early seedling growth increased subsequent seedling resistance to oxidative stress and transpirational water use. Experimental warming during seed development, germination, and seedling growth affected seedling emergence and survival. Oxidative stress resistance, morphology, and water relations were affected only by warming imposed during germination and seedling growth. This work explores potential outcomes of climate warming on multiple dimensions of seedling performance and uniquely illustrates that plant responses to heat vary with plant developmental stage in addition to the magnitude of temperature change.
- Published
- 2021
- Full Text
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22. Hyperbolic metamaterial interfaces: Hawking radiation from Rindler horizons and spacetime signature transitions
- Author
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Igor I. Smolyaninov, Ehren R. Hwang, and Evgenii E. Narimanov
- Subjects
Electromagnetic field ,Physics ,Spacetime ,Field (physics) ,Physics::Optics ,Metamaterial ,Boundary (topology) ,Physics::Classical Physics ,Condensed Matter Physics ,Nanoscience and Nanotechnology ,Electronic, Optical and Magnetic Materials ,General Relativity and Quantum Cosmology ,Rindler coordinates ,Classical mechanics ,Quantum mechanics ,Minkowski space ,Hawking radiation - Abstract
Extraordinary rays in a hyperbolic metamaterial behave as particle world lines in a three-dimensional (2 + 1) Minkowski spacetime. We analyze electromagnetic field behavior at the boundaries of this effective spacetime depending on the boundary orientation. If the boundary is perpendicular to the spacelike direction in the metamaterial, an effective Rindler horizon may be observed, which produces Hawking radiation. On the other hand, if the boundary is perpendicular to the timelike direction, the system undergoes a phase transition to a state with a different nature of the spacetime, with nonintegrable field divergence at the transformation point. Experimental observations of the transition using plasmonic metamaterials confirm this conclusion.
- Published
- 2012
- Full Text
- View/download PDF
23. Oxides of nitrogen emissions from turbulent jet flames: Part II—Fuel dilution and partial premixing effects
- Author
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Ehren R. Maund, Stephen R. Turns, Ramarao V. Bandaru, and Franklin H. Myhr
- Subjects
Premixed flame ,Jet (fluid) ,Chemistry ,General Chemical Engineering ,Inorganic chemistry ,Diffusion flame ,Analytical chemistry ,General Physics and Astronomy ,Energy Engineering and Power Technology ,General Chemistry ,Adiabatic flame temperature ,Dilution ,Fuel Technology ,Crankcase dilution ,Combustor ,NOx - Abstract
Measurements of NOx emission indices, flame radiant fractions, and visible flame length were made for turbulent, nonpremixed, jet flames for which various amounts of inert diluent or air were mixed with the fuel. The objective of the study was to explore further the role of flame radiation in NOx production in jet flames. Vertical free jet flames were stabilized on a 4.12 mm diameter straight-tube burner. Four fuels, CH4, C2H4, C3H8, and a 95% CO5% H2 mixture (by mass); three inert diluents, N2, Ar, and CO2; and air premixing were employed in parametric tests. Complementary dilution experiments were run with laminar jet flames using the three hydrocarbon fuels and N2. For the turbulent flames, the results showed that the effects of dilution and premixing were strongly dependent on fuel type. Flame temperatures and NOx emissions increased when the more sooting fuels (C3H8 and C2H4) were diluted or partially premixed, resulting in increased NOx emissions. The opposite trend was observed for the nonluminous COH2 flames. Using the results reported here and from Part I [1] of this study, the effects of residence time, flame temperature, and departure from equilibrium on NOx emissions, regardless of what parameter affected the change, were well characterized by regressing characteristic NOx production rates as a function of nonadiabatic characteristic flame temperatures and global residence times. Separate regressions for the hydrocarbon and COH2 flames showed a weaker dependence of NOx on temperature for the hydrocarbons, suggesting that the prompt NO mechanism is quite active in these flames. The laminar flame experiments demonstrated the importance of the relative locations of NOx-producing regions and soot-containing (strongly radiating) regions of the flame.
- Published
- 1993
- Full Text
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24. Hyperbolic metamaterial interfaces: Hawking radiation from Rindler horizons and spacetime signature transitions
- Author
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Smolyaninov, Igor I., Hwang, Ehren R., Narimanov, Evgenii, Smolyaninov, Igor I., Hwang, Ehren R., and Narimanov, Evgenii
- Abstract
Extraordinary rays in a hyperbolic metamaterial behave as particle world lines in a three-dimensional (2 + 1) Minkowski spacetime. We analyze electromagnetic field behavior at the boundaries of this effective spacetime depending on the boundary orientation. If the boundary is perpendicular to the spacelike direction in the metamaterial, an effective Rindler horizon may be observed, which produces Hawking radiation. On the other hand, if the boundary is perpendicular to the timelike direction, the system undergoes a phase transition to a state with a different nature of the spacetime, with nonintegrable field divergence at the transformation point. Experimental observations of the transition using plasmonic metamaterials confirm this conclusion.
- Published
- 2012
25. Design and evaluation of a human immunodeficiency virus type 1 RNA assay using nucleic sequence-based amplification technology able to quantify both group M and O viruses by using the long terminal repeat as target
- Author
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de Baar, M.P., van der Schoot, A.M., Goudsmit, J., Jacobs, F., Ehren, R., van der Horn, K.H.M., Oudshoorn, P., de Wolf, F., de Ronde, A., and Faculteit der Geneeskunde
- Subjects
sense organs - Published
- 1999
26. Design and evaluation of a human immunodeficiency virus type 1 RNA assay using nucleic acid sequence-based amplification technology able to quantify both group M and O viruses by using the long terminal repeat as target
- Author
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de Baar, M. P., van der Schoot, A. M., Goudsmit, J., Jacobs, F., Ehren, R., van der Horn, K. H., Oudshoorn, P., de Wolf, F., de Ronde, A., and Other departments
- Subjects
viruses - Abstract
Currently available human immunodeficiency virus type 1 (HIV-1) RNA quantification assays can detect most viruses of the group M subtypes, but a substantial number are missed or not quantified reliably. Viruses of HIV-1 group O cannot be detected by any commercially available assay. We developed and evaluated a quantitative assay based on nucleic acid sequence-based amplification (NASBA) technology, with primers and probes located in the conserved long terminal repeat (LTR) region of the HIV-1 genome. In 68 of 72 serum samples from individuals infected with HIV-1 subtypes A to H of group M, viruses could be detected and quantified. In serum samples from two patients infected with HIV-1 group O viruses, these viruses as well could be detected and quantified. In contrast, the currently used gag-based assay underestimated the presence of subtype A viruses and could not detect subtype G and group O viruses. The discrepancy between the results of the two assays may be explained by the number of mismatches found within and among the probe and primer regions of the subtype isolates. These data indicate that LTR-based assays, including the NASBA format chosen here, are better suited to monitoring HIV-1 therapy than are gag-based assays in an era in which multiple HIV-1 subtypes and groups are spreading worldwide
- Published
- 1999
27. Perspectives on Drought Preconditioning Treatments With a Case Study Using Western Larch
- Author
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Ehren Reid Von Moler and Andrew Steven Nelson
- Subjects
biomass ,drought preconditioning ,root growth potential ,seedling ,water limitation ,western larch ,Plant culture ,SB1-1110 - Abstract
As the demand for drought hardy tree seedlings rises alongside global temperatures, there is a need to optimize nursery drought preconditioning methods to improve field performance of planted seedlings. This perspective article advocates for a more holistic approach to drought preconditioning research that considers the moderating role of plant developmental stage on the effects of drought preconditioning. We identify discrepancies in past studies of root growth potential (RGP) responses to drought preconditioning and highlight studies that suggest such discrepancies may result from inconsistencies among studies in the timing of drought preconditioning implementation. We then illustrate our perspective by presenting original research from an aeroponic RGP trial of 1st-year western larch (Larix occidentalis Nutt.) seedlings exposed to three soil moisture contents for 6months. We evaluated whether drought preconditioning could be used to increase the ratio of root: foliar tissue mass or enhance seedling physiological vigor during a subsequent growth period. Drought preconditioning was found to increase the ratio of root: foliar tissue mass and enhance seedling physiological vigor. Specifically, soil moisture content related negatively with new root biomass, positively with new foliar biomass, and negatively with the length and number of new roots (p
- Published
- 2021
- Full Text
- View/download PDF
28. Oxides of nitrogen emissions from turbulent jet flames: Part II—Fuel dilution and partial premixing effects
- Author
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Turns, Stephen R., primary, Myhr, Franklin H., additional, Bandaru, Ramarao V., additional, and Maund, Ehren R., additional
- Published
- 1993
- Full Text
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29. Intensive oral prophylaxis does not alter the tongue microbiome in young patients with chronic kidney disease: longitudinal, randomized, controlled study.
- Author
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Hoefer KC, Weber LT, Barbe AG, Graf I, Thom S, Ehren R, Nowag A, Wisplinghoff H, Noack MJ, Scholz CJ, and Jazmati N
- Subjects
- Humans, Male, Female, Adolescent, Child, Longitudinal Studies, Young Adult, Renal Insufficiency, Chronic microbiology, Tongue microbiology, Microbiota drug effects, Gingivitis microbiology, Gingivitis prevention & control
- Abstract
Introduction: Gingivitis is a common intraoral disease in patients with chronic kidney disease (CKD), which poses a particular interdisciplinary challenge. We aimed to determine the influence of an intensive oral prophylaxis program (OPP) compared to standard prevention measures on the tongue microbiome of young patients with CKD., Methods: Thirty patients with CKD (mean age 14.2 ± 5.2 years) and generalized gingivitis were included. The effects of the intensive OPP were compared with standard prophylaxis according to statutory health insurance (treatment as usual, TAU) as a control. Tongue swabs were taken from the patients at baseline (t1) and after 3 (t2) and 6 (t3) months. Next-generation sequencing of 16S rDNA genes was used to quantitatively characterize microbial communities., Results: There were no differences in the abundance, richness, or diversity of the observed genera and species between the two study groups at baseline or after 3 or 6 months. Furthermore, no change in predefined gingivitis and oral health bacterial clusters were found. At the phylum level, Firmicutes were decreased after intervention in the TAU group (t2
TAU 42.9 ± 7.1 to t3TAU 34.8 ± 4.7 (npairs =14), p=0.003; false discovery rate 0.02). The decrease of Firmicutes was not significant in the OPP group., Conclusions: Despite the intensity of dental prophylaxis and decreasing clinical signs of inflammation and decreasing plaque amount, no clinically relevant changes in the tongue microbiome were observed. Our results confirm the conserved and stable nature of the tongue microbiome, even in children with CKD., 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 Hoefer, Weber, Barbe, Graf, Thom, Ehren, Nowag, Wisplinghoff, Noack, Scholz and Jazmati.)- Published
- 2024
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30. Corrigendum to "A multicenter retrospective study of calcineurin inhibitors in nephrotic syndrome secondary to podocyte gene variants." Kidney Int. 2023;103:962-972.
- Author
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Malakasioti G, Iancu D, Milovanova A, Tsygin A, Horinouchi T, Nagano C, Nozu K, Kamei K, Fujinaga S, Iijima K, Kang HG, Sinha R, Basu B, Morello W, Montini G, Waters A, Boyer O, Yıldırım ZY, Yel S, Dursun İ, McCarthy HJ, Vivarelli M, Prikhodina L, Besouw MTP, Chan EY, Huang W, Kemper MJ, Loos S, Prestidge C, Wong W, Zlatanova G, Ehren R, Weber LT, Chehade H, Hooman N, Tkaczyk M, Stańczyk M, Miligkos M, and Tullus K
- Published
- 2024
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31. Repetitive administration of rituximab can achieve and maintain clinical remission in patients with MCD or FSGS.
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Osterholt T, Todorova P, Kühne L, Ehren R, Weber LT, Grundmann F, Benzing T, Brinkkötter PT, and Völker LA
- Subjects
- Adult, Humans, Rituximab, Proteinuria complications, Recurrence, Glomerulosclerosis, Focal Segmental complications, Nephrosis, Lipoid complications, Nephrotic Syndrome drug therapy
- Abstract
Minimal change disease (MCD) and focal segmental glomerulosclerosis (FSGS) are glomerulopathies associated with nephrotic syndrome. Primary forms of these diseases are treated with various regimes of immunosuppression. Frequently relapsing or glucocorticoid-dependent courses remain challenging. Here, a B-cell-depleting strategy with rituximab represents a salvage option although data are sparse in the adult population. In particular, there is limited evidence on the efficacy of restoring remission after initial successful treatment with rituximab and whether patients benefit from an individualized, relapse-based approach. We identified 13 patients who received multiple therapies with rituximab from the FOrMe-registry (NCT03949972), a nationwide registry for MCD and FSGS in Germany, or from the University Hospital of Cologne. Disease status, changes in serum creatinine, proteinuria, and time to relapse were evaluated. Relapse-free survival was compared to the patients' previous therapy regimens. Through all treatment cycles, an improvement of disease activity was shown leading to a complete remission in 72% and partial remission in 26% after 3 ([Formula: see text]0.001) and 6 months ([Formula: see text]0.001). Relapse-free survival increased from 4.5 months (95%-CI 3-10 months) to 21 months (95%-CI 16-32 months) ([Formula: see text]0.001) compared to previous immunosuppression regimens with no loss in estimated glomerular filtration over time (p = 0.53). Compared to continuous B-cell depletion, an individualized relapse-based approach led to a reduced rituximab exposure and significant cost savings. Relapse-based administration of rituximab in patients with MCD/FSGS with an initial good clinical response did not result in a decreased efficacy at a median follow-up duration of 110 months. Thus, reinduction therapies may provide an alternative to continuous B-cell-depletion and reduce the long-term side effects of continuous immunosuppression., (© 2023. The Author(s).)
- Published
- 2023
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32. The role of the immune system in idiopathic nephrotic syndrome.
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Hackl A, Zed SEDA, Diefenhardt P, Binz-Lotter J, Ehren R, and Weber LT
- Abstract
Idiopathic nephrotic syndrome (INS) in children is characterized by massive proteinuria and hypoalbuminemia and usually responds well to steroids. However, relapses are frequent, which can require multi-drug therapy with deleterious long-term side effects. In the last decades, different hypotheses on molecular mechanisms underlying INS have been proposed and several lines of evidences strongly indicate a crucial role of the immune system in the pathogenesis of non-genetic INS. INS is traditionally considered a T-cell-mediated disorder triggered by a circulating factor, which causes the impairment of the glomerular filtration barrier and subsequent proteinuria. Additionally, the imbalance between Th17/Tregs as well as Th2/Th1 has been implicated in the pathomechanism of INS. Interestingly, B-cells have gained attention, since rituximab, an anti-CD20 antibody demonstrated a good therapeutic response in the treatment of INS. Finally, recent findings indicate that even podocytes can act as antigen-presenting cells under inflammatory stimuli and play a direct role in activating cellular pathways that cause proteinuria. Even though our knowledge on the underlying mechanisms of INS is still incomplete, it became clear that instead of a traditionally implicated cell subset or one particular molecule as a causative factor for INS, a multi-step control system including soluble factors, immune cells, and podocytes is necessary to prevent the occurrence of INS. This present review aims to provide an overview of the current knowledge on this topic, since advances in our understanding of the immunopathogenesis of INS may help drive new tailored therapeutic approaches forward., (© 2021. The Author(s).)
- Published
- 2021
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33. Precise variant interpretation, phenotype ascertainment, and genotype-phenotype correlation of children in the EARLY PRO-TECT Alport trial.
- Author
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Boeckhaus J, Hoefele J, Riedhammer KM, Tönshoff B, Ehren R, Pape L, Latta K, Fehrenbach H, Lange-Sperandio B, Kettwig M, Hoyer P, Staude H, Konrad M, John U, Gellermann J, Hoppe B, Galiano M, Gessner M, Pohl M, Bergmann C, Friede T, and Gross O
- Subjects
- Adolescent, Child, Child, Preschool, Early Diagnosis, Female, Genes, X-Linked genetics, Genetic Testing, Humans, Infant, Kidney pathology, Male, Nephritis, Hereditary diagnosis, Nephritis, Hereditary pathology, Nephritis, Hereditary therapy, Renal Insufficiency diagnosis, Renal Insufficiency pathology, Renal Insufficiency therapy, Collagen Type IV genetics, Genetic Association Studies, Nephritis, Hereditary genetics, Renal Insufficiency genetics
- Abstract
Early initiation of therapy in patients with Alport syndrome (AS) slows down renal failure by many years. Genotype-phenotype correlations propose that the location and character of the individual's variant correlate with the renal outcome and any extra renal manifestations. In-depth clinical and genetic data of 60/62 children who participated in the EARLY PRO-TECT Alport trial were analyzed. Genetic variants were interpreted according to current guidelines and criteria. Genetically solved patients with X-linked inheritance were then classified according to the severity of their COL4A5 variant into less-severe, intermediate, and severe groups and disease progress was compared. Almost 90% of patients were found to carry (likely) pathogenic variants and classified as genetically solved cases. Patients in the less-severe group demonstrated a borderline significant difference in disease progress compared to those in the severe group (p = 0.05). While having only limited power according to its sample size, an obvious strength is the precise clinical and genetic data of this well ascertained cohort. As in published data differences in clinical progress were shown between patients with COL4A5 less-severe and severe variants. Therefore, clinical and segregational data are important for variant (re)classification. Genetic testing should be mandatory allowing early diagnosis and therapy of AS., (© 2020 The Authors. Clinical Genetics published by John Wiley & Sons Ltd.)
- Published
- 2021
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34. A multicenter, randomized, placebo-controlled, double-blind phase 3 trial with open-arm comparison indicates safety and efficacy of nephroprotective therapy with ramipril in children with Alport's syndrome.
- Author
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Gross O, Tönshoff B, Weber LT, Pape L, Latta K, Fehrenbach H, Lange-Sperandio B, Zappel H, Hoyer P, Staude H, König S, John U, Gellermann J, Hoppe B, Galiano M, Hoecker B, Ehren R, Lerch C, Kashtan CE, Harden M, Boeckhaus J, and Friede T
- Subjects
- Angiotensin-Converting Enzyme Inhibitors adverse effects, Bayes Theorem, Child, Double-Blind Method, Glomerular Filtration Rate, Humans, Prospective Studies, Nephritis, Hereditary genetics, Ramipril adverse effects
- Abstract
Children with Alport syndrome develop renal failure early in life. Since the safety and efficacy of preemptive nephroprotective therapy are uncertain we conducted a randomized, placebo-controlled, double-blind trial in 14 German sites of pediatric patients with ramipril for three to six years plus six months follow-up to determine these parameters. Pretreated children and those whose parents refused randomization became an open-arm control, which were compared to prospective real-world data from untreated children. The co-primary endpoints were safety (adverse drug reactions) and efficacy (time to progression). Out of 66 oligosymptomatic children, 22 were randomized and 44 joined the open-arm comparison. Ramipril therapy showed no safety issues (total of 216.4 patient-years on ramipril; adverse event rate-ratio 1.00; 95% confidence interval 0.66-1.53). Although not significant, our results cautiously showed that ramipril therapy was effective: in the randomized arm, Ramipril decreased the risk of disease progression by almost half (hazard ratio 0.51 (0.12-2.20)), diminished the slope of albuminuria progression and the decline in glomerular filtration. In adjusted analysis, indications of efficacy were supported by prospective data from participants treated open label compared with untreated children, in whom ramipril again seemed to reduce progression by almost half (0.53 (0.22-1.29)). Incorporating these results into the randomized data by Bayesian evidence synthesis resulted in a more precise estimate of the hazard-ratio of 0.52 (0.19-1.39). Thus, our study shows the safety of early initiation of therapy and supports the hope to slow renal failure by many years, emphasizing the value of preemptive therapy. Hence, screening programs for glomerular hematuria in children and young adults could benefit from inclusion of genetic testing for Alport-related gene-variants., (Copyright © 2020 International Society of Nephrology. Published by Elsevier Inc. All rights reserved.)
- Published
- 2020
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35. A newly established clinical registry of minimal change disease and focal and segmental glomerulosclerosis in Germany.
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Völker LA, Ehren R, Grundmann F, Benzing T, Weber LT, and Brinkkötter PT
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- 2019
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36. The quest for optimal control of relapses in children with nephrotic syndrome.
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Schijvens AM, Ehren R, Weber LT, and Schreuder MF
- Subjects
- Child, Humans, Levamisole, Mycophenolic Acid, Prednisolone, Recurrence, Nephrotic Syndrome
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- 2019
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37. Initial treatment of steroid-sensitive idiopathic nephrotic syndrome in children with mycophenolate mofetil versus prednisone: protocol for a randomised, controlled, multicentre trial (INTENT study).
- Author
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Ehren R, Benz MR, Doetsch J, Fichtner A, Gellermann J, Haffner D, Höcker B, Hoyer PF, Kästner B, Kemper MJ, Konrad M, Luntz S, Querfeld U, Sander A, Toenshoff B, and Weber LT
- Subjects
- Drug Monitoring, Germany, Humans, Logistic Models, Multicenter Studies as Topic, Prospective Studies, Randomized Controlled Trials as Topic, Recurrence, Treatment Outcome, Immunosuppressive Agents therapeutic use, Mycophenolic Acid therapeutic use, Nephrotic Syndrome drug therapy, Prednisone therapeutic use
- Abstract
Introduction: Idiopathic nephrotic syndrome is the most common glomerular disease in childhood with an incidence of 1.8 cases per 100 000 children in Germany. The treatment of the first episode implies two aspects: induction of remission and sustainment of remission. The recent Kidney Disease Improving Global Outcomes, American Academy of Pediatrics and German guidelines for the initial treatment of the first episode of a nephrotic syndrome recommend a 12-week course of prednisone. Despite being effective, this treatment is associated with pronounced glucocorticoid-associated toxicity due to high-dose prednisone administration over a prolonged period of time. The aim of the INTENT study (Initial treatment of steroid-sensitive idiopathic nephrotic syndrom in children with mycophenolate mofetil versus prednisone: protocol for a randomised, controlled, multicentre trial) is to show that an alternative treatment regimen with mycophenolic acid is not inferior regarding sustainment of remission, but with lower toxicity compared with treatment with glucocorticoids only., Methods and Design: The study is designed as an open, randomised, controlled, multicentre trial. 340 children with a first episode of steroid-sensitive nephrotic syndrome and who achieved remission by a standard prednisone regimen will be enrolled in the trial and randomised to one of two treatment arms. The standard care group will be treated with prednisone for a total of 12 weeks; in the experimental group the treatment is switched to mycophenolate mofetil, also for a total of 12 weeks in treatment duration. The primary endpoint is the occurrence of a treated relapse within 24 months after completion of initial treatment., Ethics and Dissemination: Ethics approval for this trial was granted by the ethics committee of the Medical Faculty of the University of Heidelberg (AFmu-554/2014). The study results will be published in accordance with the Consolidated Standards of Reporting Trials statement and the Standard Protocol Items: Recommendations for Interventional Trials guidelines. Our findings will be submitted to major international paediatric nephrology and general paediatric conferences and submitted for publication in a peer-reviewed, open-access journal., Trial Registration Number: DRKS0006547; EudraCT2014-001991-76; Pre-result., Date of Registration: 30 October 2014; 24 February 2017., Competing Interests: Competing interests: RE, MRB, JD, AF, JG, DH, BH, PFH, BK, MJK, MK, SL, UQ and AS declare to have no competing interests. BT and LTW have received research grants from Roche Pharma AG and Novartis AG., (© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)
- Published
- 2018
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38. Design and evaluation of a human immunodeficiency virus type 1 RNA assay using nucleic acid sequence-based amplification technology able to quantify both group M and O viruses by using the long terminal repeat as target.
- Author
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de Baar MP, van der Schoot AM, Goudsmit J, Jacobs F, Ehren R, van der Horn KH, Oudshoorn P, de Wolf F, and de Ronde A
- Subjects
- Acquired Immunodeficiency Syndrome blood, Calibration, Genome, Viral, HIV Infections blood, Humans, Nucleic Acid Amplification Techniques, RNA, Viral genetics, Regression Analysis, Reproducibility of Results, Sensitivity and Specificity, Acquired Immunodeficiency Syndrome diagnosis, HIV Infections diagnosis, HIV Long Terminal Repeat, HIV-1 classification, HIV-1 genetics, RNA, Viral blood
- Abstract
Currently available human immunodeficiency virus type 1 (HIV-1) RNA quantification assays can detect most viruses of the group M subtypes, but a substantial number are missed or not quantified reliably. Viruses of HIV-1 group O cannot be detected by any commercially available assay. We developed and evaluated a quantitative assay based on nucleic acid sequence-based amplification (NASBA) technology, with primers and probes located in the conserved long terminal repeat (LTR) region of the HIV-1 genome. In 68 of 72 serum samples from individuals infected with HIV-1 subtypes A to H of group M, viruses could be detected and quantified. In serum samples from two patients infected with HIV-1 group O viruses, these viruses as well could be detected and quantified. In contrast, the currently used gag-based assay underestimated the presence of subtype A viruses and could not detect subtype G and group O viruses. The discrepancy between the results of the two assays may be explained by the number of mismatches found within and among the probe and primer regions of the subtype isolates. These data indicate that LTR-based assays, including the NASBA format chosen here, are better suited to monitoring HIV-1 therapy than are gag-based assays in an era in which multiple HIV-1 subtypes and groups are spreading worldwide.
- Published
- 1999
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