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Gao Y, Li J, Wang WJ, Zhang XD, Wang JJ, Yuan LL, Zhou GH. [Changes in OCTA-related parameters and their impact on retinal sensitivity after ILM flap inversion surgery in patients with IMH]. Zhonghua Yan Ke Za Zhi 2024; 60:250-256. [PMID: 38462373 DOI: 10.3760/cma.j.cn112142-20230926-00115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Objective: To analyze the changes in optical coherence tomography angiography(OCTA)-related parameters before and after idiopathic macular hole (IMH) internal limiting membrane (ILM) flap inversion surgery and assess their impact on retinal sensitivity. Methods: A retrospective case series study was conducted, collecting clinical data of 30 patients (30 eyes) diagnosed with IMH who underwent vitrectomy combined with ILM flap inversion surgery at Shanxi Eye Hospital, affiliated with Shanxi Medical University, between January 2020 and December 2021. Visual acuity and best-corrected visual acuity were examined preoperatively and at 1, 3, and 6 months postoperatively. Microperimetry measured retinal sensitivity (RS), and OCTA measured retinal thickness (RT) as well as vessel density (VD) in the superficial capillary plexus (SCP) and deep capillary plexus (DCP). Statistical analysis was performed using t-tests, repeated measures analysis of variance, and Pearson correlation analysis. Results: Thirty patients with IMH (30 eyes) were included, with 3 males (3 eyes) and 27 females (27 eyes). The mean age was (62.5±3.0) years, and the follow-up time was (96.3±1.3) days, with a 100% closure rate of macular holes postoperatively. RT in the macular was significantly lower at 1, 3, and 6 months postoperatively compared to preoperative values (F=46.21, P<0.001). The RT in the upper macular region showed statistically significant differences at different time points (P<0.001). VD in the SCP layer showed no significant differences between the upper and lower macular regions at various time points (F=3.21, P=0.601). VD in the upper region of the DCP layer increased at 1, 3, and 6 months postoperatively (P<0.001). RS in the macular was higher at 1, 3, and 6 months postoperatively compared to preoperative values (F=52.01, P<0.001). RS in the lower macular region increased at 3 and 6 months postoperatively (P<0.001), while in the upper region, it increased only at 6 months postoperatively (P<0.001). There was a positive correlation between RS and RT at 1 and 3 months postoperatively, but not at 6 months postoperatively in the upper macular region (r=0.40, P=0.071). In the lower macular region, there was a positive correlation between RS and RT at 1 and 3 months postoperatively (P<0.001). There was no correlation between RS in the upper macular region at 6 months postoperatively and preoperative RT (r=0.43, P=0.072), but there was a positive correlation with RT at 3 months postoperatively (r=0.58, P=0.041). Conclusions: After idiopathic macular hole internal limiting membrane flap inversion surgery, the OCTA-related parameters have changed. There are transient changes in deep vascular parameters and thinning of the retinal layers at the ILM inversion site, leading to decreased sensitivity.
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Affiliation(s)
- Y Gao
- Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China
| | - J Li
- Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China
| | - W J Wang
- Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China
| | - X D Zhang
- Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China
| | - J J Wang
- Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China
| | - L L Yuan
- Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China
| | - G H Zhou
- Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China
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Yuan LL, Mitchell RM, Pollard AI, Nietch CT, Pilgrim EM, Smucker NJ. Understanding the effects of phosphorus on diatom richness in rivers and streams using taxon-environment relationships. Freshw Biol 2023; 68:473-486. [PMID: 37538102 PMCID: PMC10395338 DOI: 10.1111/fwb.14040] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 12/11/2022] [Indexed: 08/05/2023]
Abstract
Changes in phosphorus concentrations affect periphytic diatom composition in streams, yet we rarely observe strong relationships between diatom richness and phosphorus. In contrast, changes in conductivity are strongly associated with differences in both diatom composition and richness. We hypothesised that we could better understand the mechanisms that control the phosphorus-richness relationship by examining relationships between phosphorus and the occurrence of individual diatom taxa, comparing these with relationships between conductivity and taxon occurrence, and documenting how niche breadths of taxa affect richness patterns. We estimated relationships between phosphorus and taxon occurrence using DNA metabarcoding data of diatoms collected from 1,811 sites distributed across the conterminous U.S.A. and contrasted patterns in these relationships with those between conductivity and taxon occurrence. The distribution of taxon optima for phosphorus was bimodal, with most optima located at either the maximum or minimum observed phosphorus concentration. The distribution of taxon optima for conductivity was unimodal. Niche breadths of taxa for phosphorus and for conductivity both generally increased with optimum values. The distribution of conductivity optima gave rise to a prominent hump-shaped relationship between richness and conductivity. The relationship between richness and phosphorus was also slightly hump-shaped, but this relationship would not be expected from the bimodal distribution of optima. Instead, we determined that broad niche breadths caused the hump-shaped relationship between richness and phosphorus. Our results highlight the nuanced effects that increased P loadings exert on diatom assemblages in rivers and streams and identify reasons that weak relationships between taxon richness and increased phosphorus have been observed. These findings allow us to better describe how excess phosphorus and subsets of taxa and their niche breadths contribute to patterns of taxa richness in diatom assemblages, and to improve the tools used to manage phosphorus pollution.
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Affiliation(s)
- Lester L. Yuan
- Office of Water, U. S. Environmental Protection Agency, Washington, District of Columbia, U.S.A
| | - Richard M. Mitchell
- Office of Water, U. S. Environmental Protection Agency, Washington, District of Columbia, U.S.A
| | - Amina I. Pollard
- Office of Water, U. S. Environmental Protection Agency, Washington, District of Columbia, U.S.A
| | - Christopher T. Nietch
- Office of Research and Development, U. S. Environmental Protection Agency, Cincinnati, Ohio, U.S.A
| | - Erik M. Pilgrim
- Office of Research and Development, U. S. Environmental Protection Agency, Cincinnati, Ohio, U.S.A
| | - Nathan J. Smucker
- Office of Research and Development, U. S. Environmental Protection Agency, Cincinnati, Ohio, U.S.A
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Yuan LL. Improving estimates of phosphorus loads using hierarchical models. J Hydrol (Amst) 2022; 614:1-8. [PMID: 37614977 PMCID: PMC10442720 DOI: 10.1016/j.jhydrol.2022.128558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Lester L Yuan
- Office of Water, U.S. Environmental Protection Agency, Washington, DC 20460
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Jiao J, Yuan LL, Li T, Wu H, Gu GZ, Chen GS, Zhang HL, Yu SF. [A case-control study on the relationship between DNA methylation and occupational noise hearing loss]. Zhonghua Yu Fang Yi Xue Za Zhi 2022; 56:1087-1094. [PMID: 35922236 DOI: 10.3760/cma.j.cn112150-20210917-00905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: To explore the relationship between DNA methylation and occupational noise-induced hearing loss. Methods: A case-control study was conducted. People with hearing loss induced by occupational noise were recruited as the case group and those with normal hearing but still exposed to occupational noise were recruited as the control group. A total of 60 participants were included, of which 30 participants were in the case group and 30 in the control group. The methylation level was detected by 850k genome-wide DNA methylation chip technology. The significance of differential methylated position (DMP) was tested by R-packet 'Champ'. The differential methylated region (DMR) was analyzed by using Champ's Bumphunter algorithm. Cluster profiler was used to analyze the gene list for GO and KEGG pathway enrichment. Results: There was significant difference between two groups in binaural high-frequency average hearing threshold (P<0.05), but there was no significant difference in age, smoking, drinking, hypertension, physical exercise and cumulative noise exposure. The results of DMP and DMR analysis showed that 713875 sites were detected in the case group and the control group, and 439 methylation sites with significant difference, accounting for 0.06%; 650 regions were detected, and 72 methylation regions with significant differences, accounting for 11.08%. Compared with the control group, the results of GO enrichment analysis showed that the case group had statistically significant differences in four pathways: axogenesis of projection neurons in the central nervous system, neuronal development in the central nervous system, axogenesis of neurons in the central nervous system and neuronal differentiation in the central nervous system. KEGG enrichment analysis showed that there were significant differences in sphingolipid metabolism, aldosterone synthesis and secretion, primary bile acid biosynthesis pathway between the case group and the control group. Conclusion: The occurrence of occupational noise-induced hearing loss may be related to the regulation of gene expression related to axogenesis of projection neurons in the central nervous system, development of neurons in the central nervous system, axogenesis of neurons in the central nervous system, differentiation of neurons in the central nervous system, sphingolipid metabolism, aldosterone synthesis and secretion, primary bile acid biosynthesis and gene methylation related to metabolism.
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Affiliation(s)
- J Jiao
- Department of Occupational Health, The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases),Zhengzhou 450052, China
| | - L L Yuan
- Department of Occupational Health,School of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - T Li
- Department of Occupational Health,School of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - H Wu
- Department of Administrative Office, The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases),Zhengzhou 450052, China
| | - G Z Gu
- Department of Administrative Office, The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases),Zhengzhou 450052, China
| | - G S Chen
- Department of Medical Examination Center, Wugang Institute for Occupational Health, Pingdingshan 467036, China
| | - H L Zhang
- Department of Medical Examination Center, Wugang Institute for Occupational Health, Pingdingshan 467036, China
| | - S F Yu
- Department of Public Health and Health Management, Henan Medical College, Zhengzhou 451191, China
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Smucker NJ, Pilgrim EM, Wu H, Nietch CT, Darling JA, Molina M, Johnson BR, Yuan LL. Characterizing temporal variability in streams supports nutrient indicator development using diatom and bacterial DNA metabarcoding. Sci Total Environ 2022; 831:154960. [PMID: 35378187 PMCID: PMC9169572 DOI: 10.1016/j.scitotenv.2022.154960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/25/2022] [Accepted: 03/28/2022] [Indexed: 05/26/2023]
Abstract
Interest in developing periphytic diatom and bacterial indicators of nutrient effects continues to grow in support of the assessment and management of stream ecosystems and their watersheds. However, temporal variability could confound relationships between indicators and nutrients, subsequently affecting assessment outcomes. To document how temporal variability affects measures of diatom and bacterial assemblages obtained from DNA metabarcoding, we conducted weekly periphyton and nutrient sampling from July to October 2016 in 25 streams in a 1293 km2 mixed land use watershed. Measures of both diatom and bacterial assemblages were strongly associated with the percent agriculture in upstream watersheds and total phosphorus (TP) and total nitrogen (TN) concentrations. Temporal variability in TP and TN concentrations increased with greater amounts of agriculture in watersheds, but overall diatom and bacterial assemblage variability within sites-measured as mean distance among samples to corresponding site centroids in ordination space-remained consistent. This consistency was due in part to offsets between decreasing variability in relative abundances of taxa typical of low nutrient conditions and increasing variability in those typical of high nutrient conditions as mean concentrations of TP and TN increased within sites. Weekly low and high nutrient diatom and bacterial metrics were more strongly correlated with site mean nutrient concentrations over the sampling period than with same day measurements and more strongly correlated with TP than with TN. Correlations with TP concentrations were consistently strong throughout the study except briefly following two major precipitation events. Following these events, biotic relationships with TP reestablished within one to three weeks. Collectively, these results can strengthen interpretations of survey results and inform monitoring strategies and decision making. These findings have direct applications for improving the use of diatoms and bacteria, and the use of DNA metabarcoding, in monitoring programs and stream site assessments.
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Affiliation(s)
- Nathan J Smucker
- United States Environmental Protection Agency, Office of Research and Development, Cincinnati, OH 45268, USA.
| | - Erik M Pilgrim
- United States Environmental Protection Agency, Office of Research and Development, Cincinnati, OH 45268, USA
| | - Huiyun Wu
- Oak Ridge Institute for Science and Education, P.O. Box 117, Oak Ridge, Tennessee 37831 USA c/o United States Environmental Protection Agency, Office of Research and Development, Research Triangle Park, NC 27711, USA
| | - Christopher T Nietch
- United States Environmental Protection Agency, Office of Research and Development, Cincinnati, OH 45268, USA
| | - John A Darling
- United States Environmental Protection Agency, Office of Research and Development, Research Triangle Park, NC 27711, USA
| | - Marirosa Molina
- United States Environmental Protection Agency, Office of Research and Development, Research Triangle Park, NC 27711, USA
| | - Brent R Johnson
- United States Environmental Protection Agency, Office of Research and Development, Cincinnati, OH 45268, USA
| | - Lester L Yuan
- United States Environmental Protection Agency, Office of Water, Washington, DC 20460, USA
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Yuan LL, Jones JR. Estimating phytoplankton stoichiometry from routinely collected monitoring data. Biogeochemistry 2022; 159:251-264. [PMID: 37681215 PMCID: PMC10483987 DOI: 10.1007/s10533-022-00926-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 04/04/2022] [Indexed: 09/09/2023]
Abstract
Accurately estimating the elemental stoichiometry of phytoplankton is critical for understanding biogeochemical cycles. In laboratory experiments, stoichiometric ratios vary among species and with changes in environmental conditions. Field observations of total phosphorus (P) and total nitrogen (N) collected at regional and national scales can supplement and expand insights into factors influencing phytoplankton stoichiometry, but analyses applied to these data can introduce biases that affect interpretations of the observed patterns. We introduce an analytical approach for estimating the ratio between phytoplankton N and P from the particulate fraction of nutrient pools in lake samples. We use Bayesian models to represent observations of particulate P and N as the sum of contributions from nutrients bound within phytoplankton and nutrients associated with non-phytoplankton suspended sediment. Application of this approach to particulate nutrient data collected in Missouri impoundments yields estimates of the mass ratio of N:P in phytoplankton ranging from 8-10 across a variety of lakes and seasons. N:P in particulate matter ranged from 6 to 70, a variability driven by differences in nutrients bound to non-phytoplankton suspended sediment. We adapted the Bayesian models to estimate N:P using more commonly available measurements of total P and total N and applied this model to a continental-scale monitoring data set. We compared phytoplankton nutrient content estimated from the two analyses and found that when datasets lack direct measurements of particulate nutrient concentrations, the model estimate of phytoplankton nutrient content includes contributions from nutrients within phytoplankton and dissolved nutrients that are associated with changes in phytoplankton biomass.
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Affiliation(s)
- Lester L. Yuan
- Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave, NW (Mail code 4304T), Washington DC 20460
| | - John R. Jones
- School of Natural Resources, University of Missouri, Columbia
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Yuan LL, Smucker NJ, Nietch CT, Pilgrim EM. Quantifying spatial and temporal relationships between diatoms and nutrients in streams strengthens evidence of nutrient effects from monitoring data. Freshw Sci 2022; 41:100-112. [PMID: 35646474 PMCID: PMC9132200 DOI: 10.1086/718631] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Observational data are frequently used to better understand the effects of changes in P and N on stream biota, but nutrient gradients in streams are usually associated with gradients in other environmental factors, a phenomenon that complicates efforts to accurately estimate the effects of nutrients. Here, we propose a new approach for analyzing observational data in which we compare the effects of changes in nutrient concentrations in time within individual sites and in space among many sites. Covarying relationships between other, potentially confounding environmental factors and nutrient concentrations are unlikely to be the same in both time and space, and, therefore, estimated effects of nutrients that are similar in time and space are more likely to be accurate. We applied this approach to diatom rbcL metabarcoding data collected from streams in the East Fork of the Little Miami River watershed, Ohio, USA. Changes in diatom assemblage composition were consistently associated with changes in the concentration of total reactive P in both time and space. In contrast, despite being associated with spatial differences in ammonia and urea concentrations, diatom assemblage composition was not associated with temporal changes in these nitrogen species. We suggest that the results of this analysis provide evidence of a causal effect of increased P on diatom assemblage composition. We further analyzed the effects of temporal variability in measurements of total reactive P and found that averaging periods greater than ~1 wk prior to sampling best represented the effects of P on the diatom assemblage. Comparisons of biological responses in space and time can sharpen insights beyond those that are based on analyses conducted on only 1 of the 2 dimensions.
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Affiliation(s)
- Lester L Yuan
- United States Environmental Protection Agency, Office of Water 4304T, 1200 Pennsylvania Avenue NW, Washington, DC 20460 USA
| | - Nathan J Smucker
- United States Environmental Protection Agency, Office of Research and Development, Mail Stop 587, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268 USA
| | - Christopher T Nietch
- United States Environmental Protection Agency, Office of Research and Development, Mail Stop 587, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268 USA
| | - Erik M Pilgrim
- United States Environmental Protection Agency, Office of Research and Development, Mail Stop 587, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268 USA
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Zhao DH, Hui S, Song X, Tong X, Ma J, Zhang XL, Yuan LL, Yu Y. [Effects of unsafe sexual behavior and sexual orientation on previous HIV testing and HIV testing willingness among college students in Harbin]. Zhonghua Liu Xing Bing Xue Za Zhi 2022; 43:254-259. [PMID: 35184493 DOI: 10.3760/cma.j.cn112338-20210616-00477] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze the effects of unsafe sexual behavior and sexual orientation on previous HIV testing and HIV testing willingness among college students in Harbin, to provide a theoretical basis for promoting and promoting HIV testing among them. Methods: A cross-sectional survey design was used to place the automatic vending machine of HIV urine test kit in 9 universities in Harbin from December 2017 to January 2018. The questionnaire star was used to design and recruit college students to carry out an anonymous online survey. The estimated sample size was 6 659. A multivariate logistic regression model was used to analyze the effects of unsafe sexual behavior and sexual orientation on previous HIV testing and HIV testing willingness among college students. WPS 2016 was used to sort out the database, and SPSS 21.0 software was used for statistical analysis. Results: A total of 60 849 valid questionnaires were collected. 19.1% (11 189/58 605) of college students reported having sex. College students who used condoms correctly every time, occasionally or never during sex in the past six months 58.5% (6 206/10 603), 25.2%(2 669/10 603)and 16.3% (1 728/10 603), respectively. Heterosexuality, homosexuality and bisexuality accounted for 94.1% (54 393/57 823), 2.4% (1 369/57 823) and 3.5% (2 061/57 823), respectively. The HIV testing willingness of college students was 73.3% (44 572/60 849). The proportion of previous HIV testing was 10.3% (951/9 241). Results of the multivariate logistic analysis showed that compared with the college students who used condoms correctly whenever they had sex in the past six months, there was no significant difference in the proportion of previous HIV testing among college students who sometimes/occasionally used or never used condoms (OR=0.94,95%CI:0.69-1.29; OR=1.11,95%CI:0.73-1.67), but their willingness to HIV testing was lower (OR=0.79, 95%CI:0.71-0.89; OR=0.48, 95%CI:0.42-0.55); Compared with heterosexual college students, homosexual or bisexual college students have a higher proportion of previous HIV testing (OR=2.62, 95%CI:1.62-4.24; OR=2.04, 95%CI:1.25-3.32), but have lower HIV testing willingness (OR=0.76, 95%CI: 0.62-0.93; OR=0.64, 95%CI: 0.53-0.77). Conclusions: Unsafe sexual behavior existed among college students in Harbin, and college students with weak awareness of HIV prevention also have weak awareness of testing. Behavioral intervention should be strengthened and HIV testing promoted. Compared with heterosexuals, homosexual or bisexual college students had a higher proportion of previous HIV testing, but their willingness to test was lower. The HIV detection mode with better concealment, accuracy, and convenience should be promoted on the college's campus.
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Affiliation(s)
- D H Zhao
- Department of STD/AIDS Prevention and Control, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China Infectious Disease Prevention and Control Department, Hainan Provincial Center for Disease Control and Prevention, Haikou 570203, China
| | - S Hui
- Department of STD/AIDS Prevention and Control, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China
| | - X Song
- Department of STD/AIDS Prevention and Control, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China
| | - X Tong
- Department of STD/AIDS Prevention and Control, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China
| | - J Ma
- Department of STD/AIDS Prevention and Control, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China
| | - X L Zhang
- Department of STD/AIDS Prevention and Control, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China
| | - L L Yuan
- Institute of Tumor Treatment and Prevention, Harbin Medical University, Harbin 150081, China
| | - Yanling Yu
- Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China
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Patrick CJ, Anderson KE, Brown BL, Hawkins CP, Metcalfe A, Saffarinia P, Siqueira T, Swan CM, Tonkin JD, Yuan LL. The application of metacommunity theory to the management of riverine ecosystems. WIREs Water 2021; 8:1-21. [PMID: 35874117 PMCID: PMC9301706 DOI: 10.1002/wat2.1557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
River managers strive to use the best available science to sustain biodiversity and ecosystem function. To achieve this goal requires consideration of processes at different scales. Metacommunity theory describes how multiple species from different communities potentially interact with local-scale environmental drivers to influence population dynamics and community structure. However, this body of knowledge has only rarely been used to inform management practices for river ecosystems. In this paper, we present a conceptual model outlining how the metacommunity processes of local niche sorting and dispersal can influence the outcomes of management interventions and provide a series of specific recommendations for applying these ideas as well as research needs. In all cases, we identify situations where traditional approaches to riverine management could be enhanced by incorporating an understanding of metacommunity dynamics. A common theme is developing guidelines for assessing the metacommunity context of a site or region, evaluating how that context may affect the desired outcome, and incorporating that understanding into the planning process and methods used. To maximize the effectiveness of management activities, scientists and resource managers should update the toolbox of approaches to riverine management to reflect theoretical advances in metacommunity ecology.
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Affiliation(s)
- Christopher J Patrick
- Department of Biological Sciences, Virginia Institute of Marine Science, College of William and Mary, 1370 Greate Rd., Gloucester Point, VA 23062
| | - Kurt E Anderson
- Department of Evolution, Ecology, and Organismal Biology, 900 University Ave., University of California, Riverside, CA, 92521, USA
| | - Brown L Brown
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24060, USA
| | - Charles P Hawkins
- Department of Watershed Sciences, Ecology Center, and National Aquatic Monitoring Center, Utah State University, Logan, Utah, USA
| | - Anya Metcalfe
- United States Geological Survey, Grand Canyon Monitoring and Research Center, 2255 North Gemini Drive, Flagstaff, AZ 86001
| | - Parsa Saffarinia
- Department of Wildlife, Fish, and Conservation Biology, University of California, Davis, CA, 95616, USA
| | - Tadeu Siqueira
- Institute of Biosciences, São Paulo State University (Unesp), Av. 24A 1515, Rio Claro, São Paulo 13506-900 Brazil
| | | | - Jonathan D Tonkin
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
| | - Lester L Yuan
- United States Environmental Protection Agency - Office of Water
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Yuan LL, Mai ZJ, Jiang WZ, Zhang YL, Fan YY, Liu YM. [Analysis of the level of T lymphocyte subsets and the relationship with the prognosis of pulmonary fibrosis in patients with paraquat poisoning]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2021; 39:114-117. [PMID: 33691365 DOI: 10.3760/cma.j.cn121094-20200609-00325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze the levels of T lymphocyte subsets (CD3, CD4, CD8 and CD4/CD8) in patients with paraquat poisoning, and to explore the relationship between the changes of T lymphocyte subsets and the prognosis of pulmonary fibrosis. Methods: In October 2019, a total of 47 patients with oral 20% paraquat low water solvent poisoning in Guangzhou 12th people's Hospital from June 2018 to June 2019 were selected as the research objects. Patients were divided into early death group (16 cases died within 2 weeks) and non early death group (31 cases survived more than 2 weeks) . The non early death group was divided into pulmonary fibrosis group (23 cases) and normal lung group (8 cases) . 20 healthy people in the same period were randomly selected as the control group. The neutrophils (N) , C reaction protein (CRP) , alanine aminotransferase (ALT) , creatinine (Cr) , amylase (aAMY) , creatine kinase isoenzyme (CKMB) , pH, HCO(3)(-), blood oxygen saturation (SO(2)) and lactic acid (Lac) of patients poisoned within 3 d were examined every day. Independent sample t-test was used for inter group comparison, and paired sample t-test was used for intra group comparison. Results: Compared with non early death group, the levels of N, CRP, ALT, Cr, aAMY, CKMB and Lac in early death group increased (P<0.05) , while pH and HCO(3)(-) decreased (P<0.05) . Compared with the control group, the levels of CD3, CD4 and CD4/CD8 were decreased on the first day in the early death group and non early death group (P<0.05) , and the levels of CD3, CD4 and CD4/CD8 were decreased on the 15th day in the pulmonary fibrosis group (P<0.05) . Compared with the normal lung group, the levels of CD3, CD4 and CD4/CD8 in the pulmonary fibrosis group decreased on the 15th day (P<0.05) . Conclusion: The persistent low cellular immune function in patients with paraquat poisoning is related to the progress of pulmonary fibrosis, which is an important factor affecting the prognosis of patients with pulmonary fibrosis.
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Affiliation(s)
- L L Yuan
- Guangzhou 12th People's Hospital, Guangzhou 510000, China
| | - Z J Mai
- Guangzhou 12th People's Hospital, Guangzhou 510000, China
| | - W Z Jiang
- Guangzhou 12th People's Hospital, Guangzhou 510000, China
| | - Y L Zhang
- Guangzhou 12th People's Hospital, Guangzhou 510000, China
| | - Y Y Fan
- Guangzhou 12th People's Hospital, Guangzhou 510000, China
| | - Y M Liu
- Guangzhou 12th People's Hospital, Guangzhou 510000, China
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Yuan LL. Continental-scale effects of phytoplankton and non-phytoplankton turbidity on macrophyte occurrence in shallow lakes. Aquat Sci 2021; 14:10.1007/s00027-020-00769-1. [PMID: 34366634 PMCID: PMC8340603 DOI: 10.1007/s00027-020-00769-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/18/2020] [Indexed: 06/13/2023]
Abstract
Submerged macrophytes are key components of shallow lake biological communities, and their presence has been associated with a predominantly clear-water state. Conversely, lakes lacking macrophytes are often turbid with elevated phytoplankton abundance. One main mechanism that influences the presence or absence of submerged macrophytes is turbidity that reduces the light available to macrophytes. Increases in turbidity can be caused by increased phytoplankton abundance and by increased concentrations of suspended inorganic sediment and understanding the relative contributions of these two factors can inform efforts to manage the effects of increased turbidity on macrophyte occurrence. Here, a continental scale data set is analyzed to quantify the effects of macrophytes on turbidity that originates from phytoplankton and from non-phytoplankton sources (e.g., inorganic sediment). Effects of phytoplankton assemblage composition on turbidity are also estimated. Based on this model, illustrative examples of chlorophyll concentrations needed to maintain or restore macrophytes to shallow lakes are calculated, and the difference in the magnitude of these concentrations illustrates the stabilizing effect of macrophytes on lake condition.
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Affiliation(s)
- Lester L Yuan
- Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave, NW (MC 4304T), Washington, DC 20460
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Ma CM, Wu QS, Yu TT, Wei SP, Wang F, Fang JC, Nie DJ, Yuan LL, Zhang Y, Chen X, Liu M, Zhou XS, Zhou J, Liu HX. [ABO gene subtypes and gene expression analysis in three cases of hematological malignancies patients]. Zhonghua Yi Xue Za Zhi 2020; 100:3443-3447. [PMID: 33238676 DOI: 10.3760/cma.j.cn112137-20200618-01880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the application and discovery of genotyping, gene sequencing, and gene expression analysis in the determination of ABO blood group subtypes and antigen expression abnormalities in hematological malignancies patients. Methods: From June 2019 to May 2020, three clinical cases were found with forward and reverse ABO typing discrepancy or atypical serologic agglutination pattern in the laboratory and blood transfusion department of Hebei Yanda Ludaopei Hospital were selected. Sequence-specific primer PCR (PCR-SSP) and Sanger sequencing of ABO gene coding regions were performed to determine the ABO genotypes, and whole transcriptome sequencing was used to analyze ABO and FUT1 gene expression levels. Results: A 12-year-old female acute lymphoblastic leukemia patient was determined as O.01.02 and BA.04 sub-genotype, corresponding to the serological B(A) subtype, and her ABO gene expression was normal (354.80). A 41-year-old female acute myeloid leukemia patient was determined as A1.02 and B.01 genotype, corresponding to the serological A(1)B phenotype, and her ABO gene expression was significantly reduced (45.70). A 42-year-old male with myelodysplastic syndrome and myelofibrosis was determined as A1.02 and A2.05 sub-genotype, corresponding to the serological A(1) and A(2) phenotype, respectively, and his ABO expression was negative. FUT1 expression was in the normal range in all three cases. The clinical blood product infusion strategy was formulated according to the genotype and the corresponding immunological subtype, and no significant transfusion-related adverse reactions occurred. Conclusion: Blood group sub-genotypes or aberrant gene expression can lead to ambiguities in serological blood group determination in hematological malignancies patients. ABO genotyping and gene expression analysis can help in this scenario and escort blood product infusion safety.
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Affiliation(s)
- C M Ma
- Langfang Central Blood Station, Langfang 065000
| | - Q S Wu
- Division of Pathology and Laboratory Medicine, Beijing Ludaopei Hospital, Beijing 100176, China
| | - T T Yu
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - S P Wei
- Blood Transfusion Department, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - F Wang
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - J C Fang
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - D J Nie
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - L L Yuan
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - Y Zhang
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - X Chen
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - M Liu
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - X S Zhou
- Division of Laboratory Medicine, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - J Zhou
- Blood Transfusion Department, Hebei Yanda Ludaopei Hospital, Langfang 065201, China
| | - H X Liu
- Beijing Ludaopei Institute of Hematology, Beijing 100176, China
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Yuan LL, Chen XW, Wang L, Tang XB. [Aberrant expression of ALK and clinicopathological features in Merkel cell carcinoma]. Zhonghua Bing Li Xue Za Zhi 2020; 49:931-933. [PMID: 32892561 DOI: 10.3760/cma.j.cn112151-20200114-00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- L L Yuan
- Department of Pathology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
| | - X W Chen
- Department of Pathology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
| | - L Wang
- Department of Pathology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
| | - X B Tang
- Department of Pathology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
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Xiang F, Xue DD, Luo J, Hu JH, Yuan LL, Jia JZ, Huang YS. [Effects and mechanism of mitochondrial transcription factor A and cytochrome c oxidase pathway in the energy production of hypoxic cardiomyocytes of rats regulated by tumor necrosis factor receptor associated protein 1]. Zhonghua Shao Shang Za Zhi 2020; 36:651-657. [PMID: 32829603 DOI: 10.3760/cma.j.cn501120-20200430-00247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effects and mechanism of mitochondrial transcription factor A (TFAM) and cytochrome c oxidase (COX) pathway in the energy production of hypoxic cardiomyocytes of rats regulated by tumor necrosis factor receptor associated protein 1 (TRAP1). Methods: The cardiomyocytes were isolated from 135 neonatal Sprague-Dawley rats (aged 1-3 d) and cultured for the following experiments. (1) Cells were collected and divided into normoxia blank control (NBC) group, hypoxia blank control (HBC) group, hypoxia+ TRAP1 over-expression control (HTOC) group, and hypoxia+ TRAP1 over-expression (HTO) group according to the random number table (the same grouping method below), with 1 bottle in each group. Cells in NBC group were cultured routinely, cells in HBC group were cultured in hypoxic condition for 6 hours after routine culture, cells in HTOC and HTO groups were respectively added with TRAP1 over-expression empty virus vector and TRAP1 over-expression adenovirus vector virus suspension for transfection for 48 hours after routine culture and then cultured in hypoxic condition for 6 hours. The protein expression of TFAM of cells in each group was detected by Western blotting. (2) Cells were collected and divided into NBC, HBC, HTOC, HTO, HTO+ TFAM interference control (HTOTIC), and HTO+ TFAM interference (HTOTI) groups, with 1 well in each group. Cells in the former 4 groups were dealt with the same methods as the corresponding groups in experiment (1). Cells in HTOTIC and HTOTI groups were respectively added with TFAM interference empty virus vector and TFAM interference adenovirus vector virus suspension for transfection for 48 hours, and the other processing methods were the same as those in HTO group. The content of ATP of cells in each group was determined by ATP determination kit and microplate reader, and the COX activity of cells in each group was determined by COX activity assay kit and microplate reader. (3) Cells were collected and divided into NBC group, normoxia+ sodium azide (NSA) group, HBC group, and hypoxia+ sodium azide (HSA) group, with 1 well in each group. Cells in NBC and HBC groups were respectively dealt with the same methods as the corresponding groups in experiment (1). Cells in NSA and HSA groups were respectively added with 32 nmol sodium azide at 30 min before experiment or hypoxia, and then cells in HSA group were cultured in hypoxic condition for 6 hours. The content of ATP was determined by the same method as above. The above three experiments were repeated for three times. Data were statistically analyzed with one-way analysis of variance and least significant difference test. Results: (1) Compared with that in NBC group, the protein expression of TFAM of cells in HBC group was significantly decreased (P<0.01). Compared with that in HBC group or HTOC group, the protein expression of TFAM of cells in HTO group was significantly increased (P<0.01). (2) Compared with 0.552±0.041 and 1.99±0.15 in NBC group, the COX activity (0.270±0.044) and ATP content (1.09±0.11) of cells in HBC group were significantly decreased (P<0.01). Compared with 0.269±0.042 and 1.17±0.12 in HBC group and those in HTOC group, the COX activity (0.412±0.032 and 0.404±0.016) and ATP content (1.75±0.06 and 1.69±0.07) of cells in HTO and HTOTIC groups were significantly increased (P<0.01). Compared with those in HTO and HTOTIC groups, the COX activity (0.261±0.036) and ATP content (1.23±0.07) of cells in HTOTI group were significantly decreased (P<0.01). (3) Compared with that in NBC group, the ATP content of cells in NSA and NBC groups was significantly decreased (P<0.01). Compared with that in HBC group, the ATP content of cells in HSA group was significantly decreased (P<0.01). Conclusions: TRAP1 can increase the COX activity of cardiomyocytes by raising the expression of TFAM, and finally alleviate the impairment in energy production of cardiomyocytes caused by hypoxia.
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Affiliation(s)
- F Xiang
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China
| | - D D Xue
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China
| | - J Luo
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China
| | - J H Hu
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China
| | - L L Yuan
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China
| | - J Z Jia
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China
| | - Y S Huang
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China (Huang Yuesheng is now working at Department of Wound Repair, Institute of Wound Repair, Shenzhen People's Hospital, the First Affiliated Hospital of Southern University of Science and Technology, the Second Clinical Medical College of Jinan University, Shenzhen 518020, China)
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Tang XB, Hao YH, Yao L, Li D, Yuan LL, Shen X, Wang DZ, Liu P, Wang TY, Luo SY, Zhou ML. [Clinicopathological features of invasive micropapillary salivary duct carcinoma]. Zhonghua Bing Li Xue Za Zhi 2020; 49:479-481. [PMID: 32392934 DOI: 10.3760/cma.j.cn112151-20190925-00528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- X B Tang
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - Y H Hao
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - L Yao
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - D Li
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - L L Yuan
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - X Shen
- Department of Pathology, Danjiangkou People's Hospital of Hubei Province, Danjiangkou 442700, China
| | - D Z Wang
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - P Liu
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - T Y Wang
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - S Y Luo
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
| | - M L Zhou
- Department of Pathology, Taihe Hospital, Hubei University of Medicine,Shiyan 442000, China
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Yao L, Tang XB, Yuan LL, Zhou ML, Wang DZ. [Application of double staining with ferrous sulfate and diaminobenzidine in immunohistochemistry for diagnosis of melanin tumors]. Zhonghua Bing Li Xue Za Zhi 2020; 49:482-484. [PMID: 32392935 DOI: 10.3760/cma.j.cn112151-20190917-00506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- L Yao
- Department of Pathology,Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
| | - X B Tang
- Department of Pathology,Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
| | - L L Yuan
- Department of Pathology,Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
| | - M L Zhou
- Department of Pathology,Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
| | - D Z Wang
- Department of Pathology,Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China
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Yuan LL, Chen GS, Jiao J, Zhou WH, Wu H, Gu GZ, Zhang HL, Zheng YX, Yu SF. [Association between GSTP1 gene polymorphisms and susceptibility to noise-induced hearing loss]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2020; 38:101-107. [PMID: 32306671 DOI: 10.3760/cma.j.issn.1001-9391.2020.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the association between the single nucleotide polymorphisms (SNPS) at rs1695 and rs6591256 in glutathione S-transferase P1 (GSTP1) gene and susceptibility to noise-induced hearing loss in Chinese Han workers exposed to noise. Methods: Using the 1: 1 nested case-control study and taking 6297 workers exposed to noise in a steel plant in Henan province as the cohort study population in July 2019, we screened those who have been exposed to noise for ≥3 years and whose binaural high frequency (3000, 4000, 6000 Hz) average hearing threshold is ≥40 dB (A) into the case group. The control group was selected according to the matching criteria of the same sex, same type of work, and the age difference was not more than 5 years old, and the working age difference was not more than 2 years. 276 subjects were selected into the case group and the control group respectively. The medium and high throughout single nucleotide polymorphism typing technology (SNPscanTM technology) was used to detect the polymorphism of three nucleotide sites of GSR gene, and conditional logistic regression was used to analyze the relationship between single nucleotide polymorphism (SNP) and NIHL, and the relationship between different polymorphic sites and the risk of NIHL after adjusting covariates. After stratification with different cumulative noise exposure (CNE) , Conditional logistic regression analysis was used to analysis the risk of NIHL at different loci. Results: The mean and standard deviation of age of the selected subjects was (40.28±8.00) , the mean and standard deviation of noise-exposed working years was (18.7±8.92) years. The range of noise exposure levels and comulative noise exposure were 80.05-93.35dB (A) and 86.83-107.92 dB (A) ·year, respectively. Compared with the control group, there were no statistically significant differences in age, noise-exposured working years, intensity of noise exposure, CNE, gender, drinking, hypertension prevalence and noise exposure level in the hearing loss group (P>0.05) , while there were statistically difference in smoking, binaural high-frequency average hearing threshold and binaural speech frequency (P<0.05) . After adjusting for smoking, drinking, hypertension and other factors, in the co-dominant model, compared with GGgenotype, the risk of NIHL was higher in rs1002149 GT genotype and rs2251780 GA genotype (OR=1.558, 95%CI: 1.028-2.361; OR=1.550, 95%CI: 1.020-2.355, P<0.05) ; compared with TT/GT genotype, the rs1002149 TT genotype has a higher risk of developing NIHL (OR=1.494, 95%CI: 1.002-2.228, P<0.05) , while rs3779647 genotype had no relationship with the risk of NIHL (P>0.05) . In the equivalent sound level (L(Aeq)) of noise >85 dB (A) stratification, compared with GG genotype, carrying rs1002149 GT genotype and rs2251780 GT genotype has higher risk of nihl (OR=1.801, 95%CI: 1.093-2.967; OR=1.720, 95%CI: 1.050-2.817, P<0.05) . Haplotype analysis of two sites, rs1002149 and rs2251780, was not found to be related to NIIHL susceptibility. Conclusion: The allele G of rs1695 and rs6591256 may be risk factors of NIHL.
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Affiliation(s)
- L L Yuan
- Department of Labor and Environment Health, College of Public Health, Zhengzhou University, Zhengzhou 450041, China
| | - G S Chen
- Wugang Institute for Occupational Health, Wugang 462599, China
| | - J Jiao
- Henan Provincial Institute for Occupational Health, Zhengzhou 450052, China
| | - W H Zhou
- Henan Provincial Institute for Occupational Health, Zhengzhou 450052, China
| | - H Wu
- Henan Provincial Institute for Occupational Health, Zhengzhou 450052, China
| | - G Z Gu
- Henan Provincial Institute for Occupational Health, Zhengzhou 450052, China
| | - H L Zhang
- Wugang Institute for Occupational Health, Wugang 462599, China
| | - Y X Zheng
- College of Public Health, Qingdao University, Qingdao 266021, China
| | - S F Yu
- Department of Labor and Environment Health, College of Public Health, Zhengzhou University, Zhengzhou 450041, China; Henan Medical College, Zhengzhou 451191, China
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Yuan LL, Yu SF. [The relation ship between DNA methylation and hearing loss related diseases]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2020; 38:157-160. [PMID: 32306686 DOI: 10.3760/cma.j.issn.1001-9391.2020.02.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Yuan LL, Jones JR. Modeling hypolimnetic dissolved oxygen depletion using monitoring data. Can J Fish Aquat Sci 2020; 77:814-823. [PMID: 32461710 PMCID: PMC7252502 DOI: 10.1139/cjfas-2019-0294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Eutrophication increases hypoxia in lakes and reservoirs, causing deleterious effects on biological communities. Quantitative models would help managers develop effective strategies to address hypoxia issues, but most existing models are limited in their applicability to lakes with temporally resolved dissolved oxygen data. We describe a hierarchical Bayesian model that predicts dissolved oxygen in lakes based on a mechanistic understanding of the factors that influence the development of hypoxia during summer stratification. These factors include the days elapsed since stratification, dissolved organic carbon concentration, lake depth, and chlorophyll concentration. We demonstrate that the model can be fit to two datasets: one in which temporally resolved dissolved oxygen profiles were collected from 20 lakes in a single state and one in which single profiles were collected from 381 lakes across the United States. Analyses of these two datasets yielded similar relationships between volumetric oxygen demand and chlorophyll concentration, suggesting that the model structure appropriately represented the effects of eutrophication on oxygen depletion. Combining both datasets in a single model further improved the precision of predictions.
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Affiliation(s)
- Lester L. Yuan
- Office of Water, U.S. Environmental Protection Agency, Washington, DC 20460 Mail code 4304T
| | - John R. Jones
- School of Natural Resources, University of Missouri, Columbia, MO 65211
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Yuan LL, Jones JR. Rethinking phosphorus-chlorophyll relationships in lakes. Limnol Oceanogr 2020; 9999:1-11. [PMID: 32461704 PMCID: PMC7252496 DOI: 10.1002/lno.11422] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 01/06/2020] [Indexed: 06/01/2023]
Abstract
The empirical relationship between total phosphorus and chlorophyll has guided lake management decisions for decades, but imprecision in this relationship in individual lakes limits the utility of these models. Many environmental factors that potentially affect the total phosphorus-chlorophyll relationship have been studied, but here we hypothesize that imprecision can be reduced by considering differences in the proportions of phosphorus bound to three different "compartments" in the water column: phosphorus bound in phytoplankton, phosphorus bound to suspended sediment that is not associated with phytoplankton, and dissolved phosphorus. We specify a hierarchical Bayesian network model that estimates phosphorus associated with each compartment using field measurements of chlorophyll, total suspended solids, and total phosphorus collected from reservoirs in Missouri, USA. We then demonstrate that accounting for these different compartments yields accurate predictions of total phosphorus in individual lakes. Results from this model also yield insights into the mechanisms by which lake morphometric and watershed characteristics affect observed relationships between total phosphorus and chlorophyll.
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Affiliation(s)
- Lester L. Yuan
- Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave, NW, Mail code 4304T, Washington, DC 20460
| | - John R. Jones
- School of Natural Resources, University of Missouri, Columbia, Columbia, MO 65211
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Xu XJ, Yang Q, Ge L, Yuan LL, Xu YQ, Wang WB, Sun JY, Zhou N. [The humor characteristics of young epileptic patients and its correlation with depression]. Zhonghua Yi Xue Za Zhi 2020; 100:509-512. [PMID: 32164101 DOI: 10.3760/cma.j.issn.0376-2491.2020.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the characteristics of humor in young adult epileptic patients and examine the relationship between humor and depression. Methods: We recruited 55 young adult epileptic patients who visited outpatient clinic of the Department of Neurology of Yijishan Hospital of Wannan Medical College between October 2018 and March 2019 and 44 healthy controls to complete the multidimensional humor scale (MSHS), humor style questionnaire (HSQ) and Beck depression scale-Ⅱ (BDI-Ⅱ), and compared their differences between the two groups. Results: The results showed that the young adult patients with epilepsy (PWEs) were affected in humor creation, coping with humor and the totally scores of MSHS. The scores of humor creation, coping with humor and the totally scores of MSHS in the young epilepsy patients were 25.3±5.9, 16.7±5.0 and 61±10, which were significantly lower than those in the control group 29.8±6.1, 21.1±2.6 and 71±8. As for the humor style, self-defeating humor scores in PWEs were higher than controls 14±5 vs 9±3, and the self-enhancing humor scores were lower than controls 18±7 vs 23±6. The scores of BDI-Ⅱ in PWEs were significantly higher than those of normal controls 13±7 vs 6±4. Pearson's correlation test showed that the scores of BDI-Ⅱ were negatively correlated with humor creation, coping with humor, the totally scores of MSHS and self-enhancing humor scores (r=-0.566--0.721, P<0.05), while it was positively correlated with self-defeating humor scores (r=0.818, P<0.05). Among the clinically relevant factors, the scores of BDI-Ⅱ were correlated with seizure control and gender. Multiple stepwise linear regression showed that coping with humor, self-defeating and self-enhancing humor scores were closely related with depression in young epileptic adults. Conclusion: The young adults with epilepsy are affected in sense of humor and humor style, which are closely related with depression.
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Affiliation(s)
- X J Xu
- Department of Neurology, Yijishan Hospital of Wannan Medical College, Wuhu 241000, China
| | - Q Yang
- Department of Neurology, Yijishan Hospital of Wannan Medical College, Wuhu 241000, China
| | - L Ge
- Department of Neurology, Yijishan Hospital of Wannan Medical College, Wuhu 241000, China
| | - L L Yuan
- Department of Neurology, Yijishan Hospital of Wannan Medical College, Wuhu 241000, China
| | - Y Q Xu
- Department of Neurology, Yijishan Hospital of Wannan Medical College, Wuhu 241000, China
| | - W B Wang
- Department of Neurology, Yijishan Hospital of Wannan Medical College, Wuhu 241000, China
| | - J Y Sun
- Department of Neurology, Yijishan Hospital of Wannan Medical College, Wuhu 241000, China
| | - N Zhou
- Department of Neurology, the First Affiliated Hospital of Anhui Medical university, Hefei 230000, China
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Wang F, Wang W, Liu M, Zhang Y, Chen X, Yuan LL, Ma XL, Nie DJ, Wang MY, Zhang Y, Zhang W, Liu MY, Liu HX. [The impact of KIT and other concomitant gene mutations on the prognoses of patients with core-binding factor acute myeloid leukemia]. Zhonghua Yi Xue Za Zhi 2020; 100:225-229. [PMID: 32008291 DOI: 10.3760/cma.j.issn.0376-2491.2020.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To study the impact of KIT and other concomitant gene mutations on the prognoses of patients with core-binding factor acute myeloid leukemia (CBF-AML). Methods: A total of 104 newly diagnosed patients with CBF-AML in Hebei Yanda Lu Daopei Hospital from January 2014 to February 2018 were analyzed, and high-throughput gene sequencing for the detection of mutations among 58 genes was executed. Also, the clinical features of KIT mutation-positive CBF-AML (KIT+CBF-AML) patients and the effects of other concomitant gene mutations on the prognoses of patients were also analyzed. Results: A total of 56 cases (53.85%) with KIT mutations were found in 104 CBF-AML patients. Among this, KIT D816 mutation was the most common (32 patients), followed by the N822 mutation (17 patients). Patients with KIT+CBF-AML have a higher proportion of bone marrow blasts at the time of diagnoses and are more likely to have sex chromosome loss. Among the 52 patients with KIT+CBF-AML who were followed up, the allogeneic hematopoietic stem cell transplantation (allo-HSCT) group had a higher overall survival rate (OS) than that of the chemotherapy group (88.9% vs 57.1%, χ(2)=6.076, P<0.05). The event-free survival (EFS) and OS of patients with KIT+CBF-AML with FLT3 mutation were both significantly lower than those of the FLT3 mutation-negative group (EFS: 40.0% vs 72.3%, χ(2)=6.557, P<0.05; OS: 60.0% vs 87.2%, χ(2)=8.305, P<0.05). The OS of the patient with TET2 mutation was lower than that of the TET2 mutation-negative group (50.0% vs 87.5%, χ(2)=4.130, P<0.05). Conclusion: Patients with KIT+CBF-AML with concomitant gene mutations, especially FLT3 and TET2, have poor prognoses, which can be improved by allo-HSCT.
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Affiliation(s)
- F Wang
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - W Wang
- Department of Hematology, Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - M Liu
- Department of Hematology, Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Y Zhang
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - X Chen
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - L L Yuan
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - X L Ma
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - D J Nie
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - M Y Wang
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - Y Zhang
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - W Zhang
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - M Y Liu
- Division of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - H X Liu
- Beijing Lu Daopei Institute of Hematology, Beijing 100176, China
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Wang F, Chen X, Yuan LL, Wang T, Liu HX. [The progress and challenge in the study of fusions and fusion families in hematological malignancies]. Zhonghua Yi Xue Za Zhi 2019; 99:3216-3220. [PMID: 31694115 DOI: 10.3760/cma.j.issn.0376-2491.2019.41.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- F Wang
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - X Chen
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - L L Yuan
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - T Wang
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - H X Liu
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China; Beijing Lu Daopei Institute of Hematology, Beijing 100176, China
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Li YQ, Zhang AQ, Cao P, Yuan LL, Yao J. [Predictive value of the third lumbar skeletal muscle mass index on prognosis of patients with cirrhosis and ascites]. Zhonghua Gan Zang Bing Za Zhi 2019; 27:806-808. [PMID: 31734998 DOI: 10.3760/cma.j.issn.1007-3418.2019.10.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Y Q Li
- Department of Digestion, Shanghai Pudong Hospital(Fudan University Pudong Medical Center), Shanghai 201399, China
| | - A Q Zhang
- Department of Digestion, Shanxi Baiqiuen Hospital, Taiyuan 030032, China
| | - P Cao
- Department of Digestion, Shanxi Baiqiuen Hospital, Taiyuan 030032, China
| | - L L Yuan
- Department of Digestion, Shanxi Baiqiuen Hospital, Taiyuan 030032, China
| | - J Yao
- Department of Digestion, Shanxi Baiqiuen Hospital, Taiyuan 030032, China
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Wang T, Ni JB, Wang XY, Dai Y, Ma XL, Su YC, Gao YY, Chen X, Yuan LL, Liu HX. [Genetic characteristics and clinical outcomes of pediatric acute myeloid leukemia with NUP98-NSD1 fusion gene]. Zhonghua Yi Xue Za Zhi 2019; 99:2820-2825. [PMID: 31550809 DOI: 10.3760/cma.j.issn.0376-2491.2019.36.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the genetic characteristics and clinical outcomes of pediatric acute myeloid leukemia patients with NUP98-NSD1 fusion gene. Methods: A total of 80 pediatric AML patients were enrolled in this study, and bone marrow specimens were collected at initial diagnosis and relapse. NUP98-NSD1 was screened by fluorescence in situ hybridization (FISH) and PCR. Other laboratory test results and clinical outcomes were further analyzed for the NUP98-NSD1 positive cases. Results: A total of eight patients (10.0%) were positive for NUP98-NSD1, which were all fusions of NUP98 exon12 and NSD1 exon 6. There were two M2, three M4, and three M5 cases according to the French-American-British classification. Seven patients had karyotype results at the time of initial diagnosis, and none of them had complicated karyotype abnormalities. Among these patients, two cases had normal karyotype, three cases had trisomy 8, one case had trisomy 6, and two cases had anomalies involving 9q13 or 9q21. Additional karyotypic abnormalities and clonal evolutions were observed during disease progression or relapse, five cases had 9q13 or 9q32 abnormalities. Five cases (62.5%) were positive with FLT3-ITD mutation. Patients were treated with DAE/NAE/HAE/IA chemotherapy. Three cases did not achieve remission after several courses of chemotherapy, and five cases achieved remission but relapsed in 1 to 19 months. Five cases underwent salvage allogeneic hematopoietic stem cell transplantation (allo-HSCT). Among whom, four died in 40 days to 4 months after transplantation, and one survived 8.5 months till the last follow-up. Conclusions: NUP98-NSD1 is a recurrent genetic abnormality with significant clinical prognostic significance, and this group of disease has unique clinical and genetic characteristics. NUP98-NSD1 should be screened by FISH or PCR for children with AML who are newly diagnosed or refractory and relapsed to identify the high-risk genetic marker.
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Affiliation(s)
- T Wang
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - J B Ni
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - X Y Wang
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - Y Dai
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - X L Ma
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - Y C Su
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - Y Y Gao
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - X Chen
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - L L Yuan
- Department of Pathology & Laboratory Medicine, Hebei Yanda Lu Daopei Hospital, Langfang 065201, China
| | - H X Liu
- Beijing Lu Daopei Institute of Hematology, Beijing 100176, China
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Yuan LL, Mai ZJ, Yang ZQ, Liu YM. [Clinical analysis of 6 cases of acute diquat poisoning]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2019; 37:468-470. [PMID: 31256535 DOI: 10.3760/cma.j.issn.1001-9391.2019.06.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Lee SS, Bishop IW, Spaulding SA, Mitchell RM, Yuan LL. Taxonomic harmonization may reveal a stronger association between diatom assemblages and total phosphorus in large datasets. Ecol Indic 2019; 102:166-174. [PMID: 32802000 PMCID: PMC7425634 DOI: 10.1016/j.ecolind.2019.01.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Diatom data have been collected in large-scale biological assessments in the United States, such as the U.S. Environmental Protection Agency's National Rivers and Streams Assessment (NRSA). However, the effectiveness of diatoms as indicators may suffer if inconsistent taxon identifications across different analysts obscure the relationships between assemblage composition and environmental variables. To reduce these inconsistencies, we harmonized the 2008-2009 NRSA data from nine analysts by updating names to current synonyms and by statistically identifying taxa with high analyst signal (taxa with more variation in relative abundance explained by the analyst factor, relative to environmental variables). We then screened a subset of samples with QA/QC data and combined taxa with mismatching identifications by the primary and secondary analysts. When these combined "slash groups" did not reduce analyst signal, we elevated taxa to the genus level or omitted taxa in difficult species complexes. We examined the variation explained by analyst in the original and revised datasets. Further, we examined how revising the datasets to reduce analyst signal can reduce inconsistency, thereby uncovering the variation in assemblage composition explained by total phosphorus (TP), an environmental variable of high priority for water managers. To produce a revised dataset with the greatest taxonomic consistency, we ultimately made 124 slash groups, omitted 7 taxa in the small naviculoid (e.g., Sellaphora atomoides) species complex, and elevated Nitzschia, Diploneis, and Tryblionella taxa to the genus level. Relative to the original dataset, the revised dataset had more overlap among samples grouped by analyst in ordination space, less variation explained by the analyst factor, and more than double the variation in assemblage composition explained by TP. Elevating all taxa to the genus level did not eliminate analyst signal completely, and analyst remained the most important predictor for the genera Sellaphora, Mayamaea, and Psammodictyon, indicating that these taxa present the greatest obstacle to consistent identification in this dataset. Although our process did not completely remove analyst signal, this work provides a method to minimize analyst signal and improve detection of diatom association with TP in large datasets involving multiple analysts. Examination of variation in assemblage data explained by analyst and taxonomic harmonization may be necessary steps for improving data quality and the utility of diatoms as indicators of environmental variables.
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Affiliation(s)
- Sylvia S. Lee
- U.S. Environmental Protection Agency, Office of Research and Development, National Center for Environmental Assessment, 1200 Pennsylvania Ave. NW, Mail Code 8623-P, Washington, D.C. 20460, USA
| | - Ian W. Bishop
- Institute of Arctic and Alpine Research, University of Colorado, Campus Box 450, Boulder, CO 80309, USA
| | - Sarah A. Spaulding
- U.S. Geological Survey, Institute of Arctic and Alpine Research, University of Colorado, Campus Box 450, Boulder, CO 80309, USA
| | - Richard M. Mitchell
- U.S. Environmental Protection Agency, Office of Water, Office of Wetlands, Oceans, and Watersheds, 1200 Pennsylvania Ave. NW, Washington, D.C. 20460, USA
| | - Lester L. Yuan
- U.S. Environmental Protection Agency, Office of Water, Office of Science and Technology, 1200 Pennsylvania Ave. NW, Washington, D.C. 20460, USA
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Yuan LL, Jones JR. A Bayesian network model for estimating stoichiometric ratios of lake seston components. Inland Waters 2019; 9:61-72. [PMID: 32280450 PMCID: PMC7147758 DOI: 10.1080/20442041.2019.1582957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 01/28/2019] [Accepted: 02/05/2019] [Indexed: 05/09/2023]
Abstract
The elemental composition of seston provide insights into the functioning of lake food webs and how nutrients cycle through the environment. Here, we describe a Bayesian network model that simultaneously estimates relationships between dissolved and particulate nutrients, suspended volatile and non-volatile sediments, and algal chlorophyll. The model provides direct estimates of the phosphorus and nitrogen content of phytoplankton, suspended non-living organic matter, and suspended inorganic sediment. We apply this model to data collected from reservoirs in Missouri, USA to test the validity of our assumed relationships. The results indicate that, on average among all samples, the ratio of nitrogen to phosphorus (N:P) in phytoplankton and non-living organic matter in these reservoirs were similar, although under nutrient replete conditions, N:P in phytoplankton decreased. Phosphorus content of inorganic sediment was lower than in phytoplankton and non-living organic matter. The analysis also provided a means of tracking changes in the composition of whole seston over time. In addition to informing questions regarding seston stoichiometry, this modeling approach may inform efforts to manage lake eutrophication because it can improve traditional models of relationships between nutrients and chlorophyll in lakes.
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Affiliation(s)
- Lester L. Yuan
- Office of Water, U.S. Environmental Protection Agency, Washington, DC 20460, Mail code 4304T
| | - John R. Jones
- School of Natural Resources, University of Missouri, Columbia, Columbia, MO 65211
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Yuan LL, Pollard AI. Combining national and state data improves predictions of microcystin concentration. Harmful Algae 2019; 84:75-83. [PMID: 31128815 PMCID: PMC7147962 DOI: 10.1016/j.hal.2019.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 01/31/2019] [Accepted: 02/28/2019] [Indexed: 05/31/2023]
Abstract
Data collected from lakes at national (regional) scales and state (local) scales can provide different insights regarding relationships between environmental factors and biological responses, and combining these two types of data can potentially yield more precise and accurate understanding of ecological phenomena. National data can include many measures, cover large spatial areas, and span broad environmental gradients. Because of these characteristics, analyses of these data can yield accurate estimates of relationships among different lake characteristics. However, the number of samples in a national data set that is available for estimating a relationship specific to waterbodies within a smaller region, like a single state, is limited. Conversely, state monitoring data provide intensive sampling of lakes within a smaller area, but these data span a narrower range of conditions and may only include a subset of relevant measurements. Here, a Bayesian network model is described that represents the causal linkages between observations of chlorophyll a concentration, cyanobacterial biovolume, and microcystin concentration. This network model was fit to national data and provided a context for modeling observations of chlorophyll a and microcystin collected from lakes in Iowa. Using the knowledge inherent in the national network model improved the accuracy of predictions of microcystin concentrations in Iowa compared to a model based only on Iowa data.
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Affiliation(s)
- Lester L Yuan
- Office of Water, U.S. Environmental Protection Agency, Washington DC, 20460, USA.
| | - Amina I Pollard
- Office of Water, U.S. Environmental Protection Agency, Washington DC, 20460, USA
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Abstract
Accurately characterizing spatial patterns on landscapes is necessary to understand the processes that generate biodiversity, a problem that has applications in ecological theory, conservation planning, ecosystem restoration, and ecosystem management. However, the measurement of biodiversity patterns and the ecological and evolutionary processes that underlie those patterns is highly dependent on the study unit size, boundary placement, and number of observations. These issues, together known as the modifiable areal unit problem, are well known in geography. These factors limit the degree to which results from different metacommunity and macro-ecological studies can be compared to draw new inferences, and yet these types of comparisons are widespread in community ecology. Using aquatic community datasets, we demonstrate that spatial context drives analytical results when landscapes are sub-divided. Next, we present a framework for using resampling and neighborhood smoothing to standardize datasets to allow for inferential comparisons. We then provide examples for how addressing these issues enhances our ability to understand the processes shaping ecological communities at landscape scales and allows for informative meta-analytical synthesis. We conclude by calling for greater recognition of issues derived from the modifiable areal unit problem in community ecology, discuss implications of the problem for interpreting the existing literature, and identify tools and approaches for future research.
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Affiliation(s)
- Christopher J Patrick
- Office of Water, Office of Science and Technology, Mail code 4304T, U.S. Environmental Protection Agency, Washington, DC 20460
| | - Lester L Yuan
- Office of Water, Office of Science and Technology, Mail code 4304T, U.S. Environmental Protection Agency, Washington, DC 20460
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Yuan LL, Pollard AI. Changes in the relationship between zooplankton and phytoplankton biomasses across a eutrophication gradient. Limnol Oceanogr 2018; 63:2493-2507. [PMID: 31598005 PMCID: PMC6785050 DOI: 10.1002/lno.10955] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 05/21/2018] [Indexed: 05/29/2023]
Abstract
The relationship between zooplankton biomass and phytoplankton biomass can provide insight into the structure and function of lake biological communities. We used a Bayesian network model to analyze a continental-scale data dataset to estimate changes in the relationship between zooplankton (Z) and phytoplankton (P) biomasses along a eutrophication gradient. The Bayesian network model allowed us to combine two different measurements of phytoplankton biomass (chlorophyll a concentration and directly observed biovolume) to improve the precision of estimates of true biomass within each sample. The model also allowed us to estimate separate relationships between P and zooplankton abundance and between P and mean individual zooplankton biomass and then to combine these two relationships into an estimate of seasonal mean zooplankton biomass. The resulting analysis indicated that seasonal mean zooplankton biomass increased proportionally with phytoplankton biomass in oligotrophic lakes, yielding a constant ratio between Z and P and suggested that bottom-up forces determined zooplankton biomass in these systems. In eutrophic lakes, seasonal mean zooplankton biomass was nearly constant with increases in phytoplankton biomass, yielding a decrease in the ratio between Z and P with increasing eutrophication. Bottom-up forces, as quantified by an increase in the proportion of cyanobacteria, accounted for approximately one fifth of the residual variance in the model as the relationship between Z and P changed from direct proportionality in oligotrophic lakes to the nearly constant value of Z observed in eutrophic lakes, suggesting that a combination of both top-down and bottom-up forces likely determined zooplankton biomass in eutrophic lakes.
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Affiliation(s)
- Lester L Yuan
- Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave NW. Mail code 4304T, Washington, DC 20460
| | - Amina I Pollard
- Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave NW. Mail code 4304T, Washington, DC 20460
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Liu GY, Cao GL, Tian FM, Song HP, Yuan LL, Geng LD, Zheng ZY, Zhang L. Parathyroid hormone (1-34) promotes fracture healing in ovariectomized rats with type 2 diabetes mellitus. Osteoporos Int 2017; 28:3043-3053. [PMID: 28808745 DOI: 10.1007/s00198-017-4148-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 07/04/2017] [Indexed: 01/06/2023]
Abstract
UNLABELLED Ovariectomized (OVX) rats with type 2 diabetes mellitus (T2DM) with femur fracture received vehicle, insulin, or insulin plus parathyroid hormone (PTH) treatment for 2 and 3 weeks. Radiography, histomorphometry, histology, and immunohistochemistry in callus were evaluated. INTRODUCTION Reports about effects of PTH plus insulin on callus formation of osteoporotic fracture with T2DM were limited. This study was designed to investigate the effects of the combination of PTH and insulin on fracture healing in OVX rats with T2DM. METHODS Two-month-old female rats were randomly divided into five groups: normal fracture (F), OVX fracture (OF), T2DM + OVX fracture (DOF), insulin-treated (2-4 u/daylight, 4-6 u/night, DOFI), and treated with insulin and PTH (50 μg/kg/day, 5 days/week, DOFIP). A closed mid-shaft fracture was established in the right femurs of all rats after 6 weeks of OVX. Rats were euthanized at 2 and 3 weeks post-fracture according to the time schedule, respectively. RESULTS The administration of insulin alone or insulin combined with PTH significantly increased mineralized bone volume fraction (BV/TV) and connectivity density (Conn.D) compared with those of the DOF group at 3 weeks post-fracture and also increased cartilaginous callus area ratio in the DOFI and DOFIP groups at 2 weeks and bony callus area ratio in the DOFIP groups at both the 2 and 3 weeks post-fracture. CONCLUSIONS OVX rats with T2DM exhibited a marked delay in the fracture healing process; insulin treatment ameliorated these effects, and the healing process was enhanced following treatment with a combination of insulin and PTH.
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Affiliation(s)
- G Y Liu
- Department of Orthopedic Surgery, Hebei Medical University, Shijiazhuang, China
| | - G L Cao
- Department of Orthopedic Surgery, Hebei Medical University, Shijiazhuang, China
| | - F M Tian
- Medical Research Center, North China University of Science and Technology, Tangshan, China
| | - H P Song
- Department of Orthopedic Surgery, The Affiliated Hospital of North China University of Science and Technology, Tangshan, China
| | - L L Yuan
- Department of Orthopedic Surgery, The Affiliated Hospital of North China University of Science and Technology, Tangshan, China
| | - L D Geng
- Department of Orthopedic Surgery, The Affiliated Hospital of North China University of Science and Technology, Tangshan, China
| | - Z Y Zheng
- Department of Orthopedic Surgery, The Affiliated Hospital of North China University of Science and Technology, Tangshan, China
| | - L Zhang
- Department of Orthopedic Surgery, Hebei Medical University, Shijiazhuang, China.
- Department of Orthopedic Surgery, The Affiliated Hospital of North China University of Science and Technology, Tangshan, China.
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Patrick CJ, Yuan LL. Modeled hydrologic metrics show links between hydrology and the functional composition of stream assemblages. Ecol Appl 2017; 27:1605-1617. [PMID: 28376283 DOI: 10.1002/eap.1554] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 02/01/2017] [Accepted: 03/16/2017] [Indexed: 05/23/2023]
Abstract
Flow alteration is widespread in streams, but current understanding of the effects of differences in flow characteristics on stream biological communities is incomplete. We tested hypotheses about the effect of variation in hydrology on stream communities by using generalized additive models to relate watershed information to the values of different flow metrics at gauged sites. Flow models accounted for 54-80% of the spatial variation in flow metric values among gauged sites. We then used these models to predict flow metrics in 842 ungauged stream sites in the mid-Atlantic United States that were sampled for fish, macroinvertebrates, and environmental covariates. Fish and macroinvertebrate assemblages were characterized in terms of a suite of metrics that quantified aspects of community composition, diversity, and functional traits that were expected to be associated with differences in flow characteristics. We related modeled flow metrics to biological metrics in a series of stressor-response models. Our analyses identified both drying and base flow instability as explaining 30-50% of the observed variability in fish and invertebrate community composition. Variations in community composition were related to variations in the prevalence of dispersal traits in invertebrates and trophic guilds in fish. The results demonstrate that we can use statistical models to predict hydrologic conditions at bioassessment sites, which, in turn, we can use to estimate relationships between flow conditions and biological characteristics. This analysis provides an approach to quantify the effects of spatial variation in flow metrics using readily available biomonitoring data.
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Affiliation(s)
- Christopher J Patrick
- Department of Life Sciences, Texas A&M University Corpus Christ, Corpus Christi, TX, 78412, USA
| | - Lester L Yuan
- Department of Life Sciences, Texas A&M University Corpus Christ, Corpus Christi, TX, 78412, USA
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Niu LY, Yuan LL, Zhu N, Zhang R, Kang Y. [Effect of sclerotherapy on esophageal varices in cirrhotic patients with diabetes: a prognostic analysis]. Zhonghua Gan Zang Bing Za Zhi 2017; 25:463-465. [PMID: 28763866 DOI: 10.3760/cma.j.issn.1007-3418.2017.06.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- L Y Niu
- Gastroenterology Department, Shanxi Academy of Medical Sciences, Shanxi Dayi Hospital, Taiyuan 030032, China
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Yuan LL, Pollard AI. Using National-Scale Data To Develop Nutrient-Microcystin Relationships That Guide Management Decisions. Environ Sci Technol 2017; 51:6972-6980. [PMID: 28561562 DOI: 10.1021/acs.est.7b01410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Quantitative models that predict cyanotoxin concentrations in lakes and reservoirs from nutrient concentrations would facilitate management of these resources for recreation and as sources of drinking water. Development of these models from field data has been hampered by the high proportion of samples in which cyanotoxin concentrations are below detection limits and by the high variability of cyanotoxin concentrations within individual lakes. Here, we describe a national-scale hierarchical Bayesian model that addresses these issues and that predicts microcystin concentrations from summer mean total nitrogen and total phosphorus concentrations. This model accounts for 69% of the variance in mean microcystin concentrations in lakes and reservoirs of the conterminous United States. Mean microcystin concentrations were more strongly associated with differences in total nitrogen than total phosphorus. A general approach for assessing this and similar types of models for their utility for guiding management decisions is also described.
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Affiliation(s)
- Lester L Yuan
- Office of Water, U.S. Environmental Protection Agency , 1200 Pennsylvania Avenue, Washington, D.C. 20460, United States
| | - Amina I Pollard
- Office of Water, U.S. Environmental Protection Agency , 1200 Pennsylvania Avenue, Washington, D.C. 20460, United States
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Yuan LL, Kan Y, Ma DQ, Yang JG. Combined application of ultrasound and SPECT/CT has incremental value in detecting parathyroid tissue in SHPT patients. Diagn Interv Imaging 2015; 97:219-25. [PMID: 26432401 DOI: 10.1016/j.diii.2015.08.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 08/02/2015] [Accepted: 08/26/2015] [Indexed: 11/15/2022]
Abstract
PURPOSE The goal of this study is to investigate whether combined application of ultrasound and 99mTc-sestamibi SPECT/CT had the incremental value in accurately detecting parathyroid tissue in patients with SHPT over either method alone. PATIENTS AND METHODS Sixty patients with SHPT on hemodialysis were evaluated preoperatively with parathyroid 99mTc-sestamibi SPECT/CT scintigraphy and ultrasound prior to parathyroidectomy. The sensitivity, specificity and accuracy of 99mTc-sestamibi SPECT/CT scintigraphy, ultrasound and combined application were determined respectively. RESULTS The sensitivity, specificity and accuracy of ultrasound were 81% (155/192), 47% (17/36) and 82% (172/228), respectively. The sensitivity, specificity and accuracy of 99mTc-sestamibi SPECT/CT were 85% (163/192), 58% (21/36) and 89% (184/228) respectively. The accuracy of 99mTc-sestamibi SPECT/CT in the diagnosis of parathyroid tissue in patients with SHPT is significantly higher than that of ultrasound. The sensitivity, specificity and accuracy of combined application of ultrasound and 99mTc-sestamibi SPECT/CT were 93% (178/192), 61% (22/36) and 97% (200/228). The sensitivity, specificity and accuracy of combined application of ultrasound and 99mTc-sestamibi SPECT/CT were higher than those of either ultrasound or 99mTc-sestamibi SPECT/CT. CONCLUSIONS The combined application of ultrasound and 99mTc-sestamibi SPECT/CT had incremental value in accurately detecting parathyroid tissue in patients with SHPT over either method alone.
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Affiliation(s)
- L L Yuan
- Capital Medical University, Beijing Friendship Hospital, Department of Nuclear Medicine, 95, Yong An Road, Xi Cheng district, 100050 Beijing, People's Republic of China
| | - Y Kan
- Capital Medical University, Beijing Friendship Hospital, Department of Nuclear Medicine, 95, Yong An Road, Xi Cheng district, 100050 Beijing, People's Republic of China
| | - D Q Ma
- Capital Medical University, Beijing Friendship Hospital, Radiology Department, 95, Yong An Road, Xi Cheng district, 100050 Beijing, People's Republic of China.
| | - J G Yang
- Capital Medical University, Beijing Friendship Hospital, Department of Nuclear Medicine, 95, Yong An Road, Xi Cheng district, 100050 Beijing, People's Republic of China.
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Yuan LL, Pollard AI. Classifying lakes to quantify relationships between epilimnetic chlorophyll a and hypoxia. Environ Manage 2015; 55:578-587. [PMID: 25472832 DOI: 10.1007/s00267-014-0412-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Accepted: 11/21/2014] [Indexed: 06/04/2023]
Abstract
Excess nutrient loading increases algal abundance which can cause hypoxia in many lakes and reservoirs. We used a divisive partitioning approach to analyze dissolved oxygen profile data collected across the continental United States to increase the precision of estimated relationships between chlorophyll a (chl a) concentrations and the extent of hypoxia in the water column. Chl a concentrations predicted the extent of hypoxia most accurately in lakes that were stratified at the time of sampling with a maximum temperature gradient of at least 1.2 °C/m. Lake elevation, Secchi depth, and lake geometry ratio further refined the specification of groups of lakes with different relationships between chl a and the extent of hypoxia. The statistical relationships between chl a and the extent of hypoxia that were estimated can be used directly for setting management thresholds for chl a in particular types of lakes.
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Affiliation(s)
- Lester L Yuan
- Office of Science and Technology, Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave NW, Washington, DC, 20460, USA,
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Lockridge A, Su J, Yuan LL. Abnormal 5-HT modulation of stress behaviors in the Kv4.2 knockout mouse. Neuroscience 2010; 170:1086-97. [PMID: 20801198 DOI: 10.1016/j.neuroscience.2010.08.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2009] [Revised: 08/17/2010] [Accepted: 08/21/2010] [Indexed: 10/19/2022]
Abstract
The Kv4.2 gene codes for an essential subunit of voltage-gated A-type potassium channels that are involved in dendritic signal integration and synaptic plasticity. Detailed cellular characterization in CA1 pyramidal neurons of the hippocampus has shown that knocking out the Kv4.2 gene increases neuronal excitability and promotes long-term potentiation. However, the overall behavioral consequences of these modifications have not been fully explored. Given the growing connection between neuronal plasticity and affect processing in the hippocampus and other Kv4.2 expressing regions, we proposed to investigate whether the absence of this gene would alter the stress response of mice to the forced swimming and tail suspension tests (TSTs) for depression-like behavior. Kv4.2 knockout (KO) mice, generated in the 129SvEv background, demonstrated elevated immobility and a loss of swimming, as well as antidepressant resistance to the selective 5-HT reuptake inhibitor fluoxetine (FLX). Characterization of a relatively new head movement behavior category, responsive to serotonergic treatment in wildtype (WT) mice, supported conclusions of abnormal 5-HT modulation. Electrophysiology recordings in the prefrontal cortex showed a blunting of postsynaptic response to direct 5-HT application following a single period of swim stress only in the animals without the Kv4.2 subunit. Based on our findings, we hypothesize that Kv4.2 KO mice may have an exaggerated 5-HT response to stress leading to a premature desensitization of postsynaptic receptors and a loss of continued behavior modulation. These results may shed some light on the involvement of A-type potassium channels in the effective action of selective serotonin reuptake inhibitor (SSRI) antidepressants.
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Affiliation(s)
- A Lockridge
- Department of Neuroscience, University of Minnesota, Minneapolis, MN, USA
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Abstract
Increased nutrient concentrations in streams and rivers have altered biological structure and function. Manipulative studies have provided insights into different mechanisms by which changes in nutrient concentrations influence aquatic biota, but these studies are limited in spatial scope and in their quantification of nutrient effects on aggregate measures of the invertebrate assemblage. Observational data provide a complementary source of information to manipulative studies, but these data must be analyzed such that the potential effects of spurious correlations are minimized. Propensity scores, a technique developed to analyze human health observational data, are applied here to estimate the effects of increased nutrients on the total taxon richness of stream invertebrates in a large observational data set collected from the western United States. The analysis indicates that increases in nutrient concentration are strongly associated with and cause decreases in invertebrate richness in large, but wadeable, open-canopied streams. These decreases in invertebrate richness were not mediated by periphyton biomass, a commonly proposed mechanism by which nutrients influence invertebrates. In smaller, closed-canopied streams, increases in nutrients were associated with small increases in total richness that were not statistically significant. Using propensity scores can greatly improve the accuracy of insights drawn from observational data by minimizing the potential that factors other than the factor of interest may confound the results.
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Affiliation(s)
- Lester L Yuan
- National Center for Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Mail Code 8623P, 1200 Pennsylvania Avenue, NW, Washington, D.C. 20460, USA.
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Yuan LL, Pollard AI, Carlisle DM. Using propensity scores to estimate the effects of insecticides on stream invertebrates from observational data. Environ Toxicol Chem 2009; 28:1518-1527. [PMID: 19215187 DOI: 10.1897/08-551.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Accepted: 01/27/2009] [Indexed: 05/27/2023]
Abstract
Analyses of observational data can provide insights into relationships between environmental conditions and biological responses across a broader range of natural conditions than experimental studies, potentially complementing insights gained from experiments. However, observational data must be analyzed carefully to minimize the likelihood that confounding variables bias observed relationships. Propensity scores provide a robust approach for controlling for the effects of measured confounding variables when analyzing observational data. Here, we use propensity scores to estimate changes in mean invertebrate taxon richness in streams that have experienced insecticide concentrations that exceed aquatic life use benchmark concentrations. A simple comparison of richness in sites exposed to elevated insecticides with those that were not exposed suggests that exposed sites had on average 6.8 fewer taxa compared to unexposed sites. The presence of potential confounding variables makes it difficult to assert a causal relationship from this simple comparison. After controlling for confounding factors using propensity scores, the difference in richness between exposed and unexposed sites was reduced to 4.1 taxa, a difference that was still statistically significant. Because the propensity score analysis controlled for the effects of a wide variety of possible confounding variables, we infer that the change in richness observed in the propensity score analysis was likely caused by insecticide exposure.
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Affiliation(s)
- Lester L Yuan
- National Center for Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, 1200 Pennsylvania Avenue NW, Mail Code 8623P, Washington, DC 20460, USA.
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Affiliation(s)
- Lester L. Yuan
- National Center for Environmental Assessment, US Environmental Protection Agency, 1200 Pennsylvania Ave, NW, 8623P, Washington, DC 20460 USA
| | - Charles P. Hawkins
- Western Center for Monitoring and Assessment of Freshwater Ecosystems, Department of Watershed Sciences, and the Ecology Center, Utah State University, Logan, Utah 84322-5210 USA
| | - John Van Sickle
- National Health and Environmental Effects Laboratory, US Environmental Protection Agency, 200 SW 35th St., Corvallis, Oregon 97333 USA
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Herlihy AT, Paulsen SG, Sickle JV, Stoddard JL, Hawkins CP, Yuan LL. Striving for consistency in a national assessment: the challenges of applying a reference-condition approach at a continental scale. ACTA ACUST UNITED AC 2008. [DOI: 10.1899/08-081.1] [Citation(s) in RCA: 156] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alan T. Herlihy
- Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon 97331 USA
| | - Steven G. Paulsen
- National Health and Environmental Effects Research Laboratory, Western Ecology Division, US Environmental Protection Agency, Corvallis, Oregon 97333 USA
| | - John Van Sickle
- National Health and Environmental Effects Research Laboratory, Western Ecology Division, US Environmental Protection Agency, Corvallis, Oregon 97333 USA
| | - John L. Stoddard
- National Health and Environmental Effects Research Laboratory, Western Ecology Division, US Environmental Protection Agency, Corvallis, Oregon 97333 USA
| | - Charles P. Hawkins
- Western Center for Monitoring and Assessment of Freshwater Ecosystems, Department of Watershed Sciences, Utah State University, Logan, Utah 84322-5210 USA
| | - Lester L. Yuan
- National Center for Environmental Assessment, Office of Research Development, US Environmental Protection Agency, Washington, DC 20460 USA
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Paulsen SG, Mayio A, Peck DV, Stoddard JL, Tarquinio E, Holdsworth SM, Sickle JV, Yuan LL, Hawkins CP, Herlihy AT, Kaufmann PR, Barbour MT, Larsen DP, Olsen AR. Condition of stream ecosystems in the US: an overview of the first national assessment. ACTA ACUST UNITED AC 2008. [DOI: 10.1899/08-098.1] [Citation(s) in RCA: 143] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Steven G. Paulsen
- Office of Research and Development, US Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97330 USA
| | - Alice Mayio
- Office of Water, US Environmental Protection Agency, Ariel Rios Building, 1200 Pennsylvania Avenue, NW 4503T, Washington, DC 20460 USA
| | - David V. Peck
- Office of Research and Development, US Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97330 USA
| | - John L. Stoddard
- Office of Research and Development, US Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97330 USA
| | - Ellen Tarquinio
- Office of Water, US Environmental Protection Agency, Ariel Rios Building, 1200 Pennsylvania Avenue, NW 4503T, Washington, DC 20460 USA
| | - Susan M. Holdsworth
- Office of Water, US Environmental Protection Agency, Ariel Rios Building, 1200 Pennsylvania Avenue, NW 4503T, Washington, DC 20460 USA
| | - John Van Sickle
- Office of Research and Development, US Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97330 USA
| | - Lester L. Yuan
- Office of Research and Development, US Environmental Protection Agency, 1200 Pennsylvania Avenue, NW 8623P, Washington, DC 20460 USA
| | - Charles P. Hawkins
- Western Center for Monitoring and Assessment of Freshwater Ecosystems, Department of Watershed Sciences and the Ecology Center, Utah State University, Logan, Utah 84322-5210 USA
| | - Alan T. Herlihy
- Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon 97331 USA
| | - Philip R. Kaufmann
- Office of Research and Development, US Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97330 USA
| | - Michael T. Barbour
- Tetra Tech, Inc., 400 Red Brook Blvd., Suite 200, Owings Mills, Maryland 21117 USA
| | - David P. Larsen
- Pacific States Marine Fisheries Commission, c/o US Environmental Protection Agency, Western Ecology Division, 200 SW 35th St., Corvallis, Oregon 97333 USA
| | - Anthony R. Olsen
- Office of Research and Development, US Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97330 USA
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Stevenson RJ, Hill BH, Herlihy AT, Yuan LL, Norton SB. Algae–P relationships, thresholds, and frequency distributions guide nutrient criterion development. ACTA ACUST UNITED AC 2008. [DOI: 10.1899/07-077.1] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Yuan LL. Maximum Likelihood Method for Predicting Environmental Conditions from Assemblage Composition: TheRPackagebio.infer. J Stat Softw 2007. [DOI: 10.18637/jss.v022.i03] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Abstract
Water quality monitoring data are usually used independently to report on the condition of streams and watersheds. For example, watersheds are often rated as good, fair, or poor with regard to a single stressor or with regard to an index of biotic integrity. The utility of monitoring data may be enhanced by integrating stressor-response information with the observed stressor data, and reporting stressor levels in terms of their relative effects upon valued ecological resources. We estimated stressor-response relationships at the regional scale using data collected in the Eastern Cornbelt Plains Ecoregion of Ohio. Generalized additive models were used to visualize stressor-response relationships. Piecewise linear functions and simple linear functions were then used to parameterize the observed responses. Parameters derived from the regional models were used to scale observations of stressors in the Big Darby Creek watershed, OH. After scaling, stressors were compared in terms of their spatial distribution and in terms of the severity with which they influenced the biological endpoint of interest. Stressors most strongly associated with the current ecological condition of the watershed were identified. In the Big Darby Creek watershed, decreases in substrate quality were associated with the most severe decrements in biological condition. At smaller decrements in biological condition, three stressors were important: substrate quality, riparian quality, and increased concentrations of NOx.
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Affiliation(s)
- Lester L Yuan
- National Center for Environmental Assessment, U.S. Environmental Protection Agency, Washington, DC, USA.
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Abstract
Accurate estimates of stressor levels in unsampled streams would provide valuable information for managing these resources over large regions. Spatial interpolation of stream characteristics have rarely been attempted, partly because defining separation distances between distinct stream samples is not straightforward. That is, conventional Eulerian definitions of separation distance may not apply to stream networks where information flows along distinct paths. A two-stage model for estimating stressor levels in unsampled streams is presented. Mean characteristics within streams are predicted usign a generalized additive model and residual variation is estimated using a conventional application of spatial statistics. The model is developed and tested using stream survey data collected in the state of Maryland, USA. Model efficiency is compared for three stream variables (nitrate concentration, sulfate concentration, and epifaunal substrate score) known to be associated with biological impairments in streams. Accounting for spatial autocorrelation in the residual variation improved model R2 from 0.71 to 0.81 for nitrate, from 0.29 to 0.63 for sulfate, and from 0.21 to 0.31 for epifaunal substrate score.
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Affiliation(s)
- Lester L Yuan
- U.S. Environmental Protection Agency, National Center for Environmental Assessment, Office of Research and Development, Washington, DC 20460, USA.
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Affiliation(s)
- Lester L. Yuan
- National Center for Environmental Assessment, US Environmental Protection Agency, Mail Code 8623D, 1200 Pennsylvania Avenue NW, Washington, DC 20460 USA
| | - Susan B. Norton
- National Center for Environmental Assessment, US Environmental Protection Agency, Mail Code 8623D, 1200 Pennsylvania Avenue NW, Washington, DC 20460 USA
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Abstract
The newly identified axotactin (AXO) protein in Drosophila, a member of the neurexin superfamily, appears to be a key element that mediates the effects of glial cells on neuronal membrane excitability and synaptic plasticity.
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Affiliation(s)
- L L Yuan
- Neuroscience Training Program, Laboratory of Genetics, University of Wisconsin, Madison, WI 53706, USA.
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