检索结果-南通市图书馆

A generalized framework for AMOVA with multiple hierarchies and ploidies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2021年第1期16卷 33-52页

作者： Kang HUANG Tiantian wANG derek w.dunn Pei ZHANG Hongjuan SUN Baoguo LI Shaanxi Key Laboratory for Animal Conservation College of Life SciencesNorthwest UniversityXi’anChina Department of Forest and Conservation Sciences University of British ColumbiaVancouverCanada Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunmingChina

The analysis of molecular variance(AMOVA)is a widely used statistical method in population genetics and molec-ular *** classic framework of AMOVA only supports haploid and diploid data,in which the number of hierarchies ranges from two to *** practice,natural populations can be classified into more hierarchies,and polyploidy is frequently observed in extant *** ploidy level may even vary within the same species,and/or within the same *** generalized the framework of AMOVA such that it can be used for any number of hierarchies and any level of *** on this framework,we present four methods to account for data that are multilocus genotypic and allelic phenotypic(with unknown allele dosage).we use simulated datasets and an empirical dataset to evaluate the performance of our *** make freely available our methods in a new software package,polygene,which is freely available at https://***/huangkang1987/polygene.

关键词： analysis of molecular variance hierarchy maximum-likelihood estimation method-of-moment estimation polyploidy

Population structure of the golden snub-nosed monkey Rhinopithecus roxellana in the Qinling Mountains, central China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2016年第5期11卷 350-360页

作者： Kang HUANG Songtao GUO Samuel A.CUSHMAN derek w.dunn Xiaoguang QI Rong HOU Jing ZHANG Qi LI Qiang ZHANG Zhen SHI Kan ZHANG Baoguo LI Shaanxi Key Laboratory for Animal Conservation College of Life SciencesNorthwest UniversityXi’anChina US Forest Service Rocky Mountain Research StationFlagstaffArizonaUSA

Environmental barriers and habitat fragmentation can restrict gene flow,leading to genetic divergence among animal *** golden snub-nosed monkey,Rhinopithecus roxellana,is endemic to China,and ranges across 4 ***,over the past 40 years its populations have become *** investigated the genetic diversity,demographic history and population structure of *** in 5 reserves in one of its strongholds,the Qinling Mountain forests of *** collected genetic material from 11 monkey bands(a group of individuals containing multiple 1-male units)with a total of 428 samples genotyped at 20 microsatellite *** richness and heterozygosity suggested a relatively high level of intra-band genetic *** found no evidence of any genetic bottleneck in these *** *** and Bayesian cluster analysis revealed that *** in the 5 reserves are highly structured and form at least 3 distinct subpopula*** subpopulations concur with major topographical features in the study area,such as mountain ridges,suggesting that dispersal of *** may be restricted by geographical barriers.

关键词： bottleneck effect genetic diversity golden snub-nosed monkey population structure

Social and paternal female choice for male MHC genes in golden snub-nosed monkeys(Rhinopithecus roxellana)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Social and paternal female choice for male MHC genes in gold...

Specialized digestive adaptations within the hindgut of a colobine monkey

第十六届全国野生动物生态与资源保护学术研讨会

作者： Pei Zhang Bingyi Zhang derek w.dunn Xiaoyue Song Kang Huang Shixuan Dong Fei Niu Meijing Ying Yingying Zhang Ruliang Pan Baoguo Li Shaanxi Key Laboratory of Animal Conservation College of Life Sciences Northwest University Shaanxi Province Engineering & Technology Research Center of Shanbei Cashmere Goats Yulin University

Genes of the major histocompatibility complex(MHC) play important roles in vertebrate immunocompetence. MHC genes thus offer females indirect benefits to mate choice through the production of offspring of an optimal MHC genotype. Females may choose males with specific MHC haplotypes, dissimilar MHC genotypes, MHC heterozygous males or MHC-diverse males. we tested these four alternatives of both female social and paternal choice in a wild population of golden snub-nosed monkeys(Rhinopithecus roxellana) by examining overall genetic variability(via microsatellites) and four MHC-genes(DRB1, DRB2, DQA1 and DQB1). Monte Carlo randomization tests showed that MHC dissimilarity was favored for social choice(males to which females were socially affiliated) and intermediate MHC dissimilarity was favored in paternal choice(fathers of offspring). No evidence of inbreeding avoidance was found for either social or paternal mates. we found that MHC heterozygotes, higher microsatellite multi-locus heterozygosity and higher microsatellites diversity were favored for social mates, and higher microsatellite diversity was favored for paternal mates. Independent of male age, we found that the formation of male-female social pairings is significantly predicted by compatibility based on the sharing of MHC haplotypes. However, we found no evidence of independent genetic effects on the duration of male-female social pairings, male social status(choice for social mates), the number of females with which individual leader males paired, the likelihood of potential male-female pairings producing offspring, or whether males fathered offspring or not. Overall, our findings suggest different genetic factors are involved in social and paternal choice in R. roxellana.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Innovation 2022年第2期3卷 103-109页

作者： Rui Liu Katherine Amato Rong Hou Andres Gomez derek w.dunn Jun Zhang Paul A.Garber Colin A.Chapman Nicoletta Righini Gang He Gu Fang Yuhang Li Baoguo Li Songtao Guo Shaanxi Key Laboratory for Animal Conservation School of Life SciencesNorthwest UniversityXi’an 710069China Department of Anthropology Northwestern UniversityEvanstonIL 60208USA Department of Animal Science University of Minnesota Twin CitiesSt.PaulMN 55455USA Department of Anthropology and Program in EcologyEvolution and Conservation BiologyUniversity of Illinois at Urbana-ChampaignUrbana-ChampaignIL 61801USA Center for the Advanced Study of Human Paleobiology Department of AnthropologyThe George Washington UniversityWashingtonDC 20037USA School of Life Sciences University of KwaZulu-NatalScottsvillePietermaritzburg 3209South Africa Instituto de Investigaciones en Comportamiento Alimentario y Nutrición(IICAN) Universidad de Guadalajara49000 Ciudad GuzmánJaliscoMexico

In mammal herbivores,fiber digestion usually occurs predominantly in either the foregut or the *** of mechanisms showing synergistic function in both gut regions for the digestion of fiber and other nutrients in wild mammals are rare because it requires integrative study of anatomy,physiology,and gut *** monkeys(Colobinae)are folivorous,with high-fiber foods fermented primarily in their foreguts.

关键词： anatomy gut primarily

Evolution of pore systems in low-maturity oil shales during thermal upgrading--Quantified by dynamic SEM and machine learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第3期21卷 1739-1750页

作者： Jun Liu Xue Bai derek Elsworth Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065SichuanChina International Quantum Academy Shenzhen518048GuangdongChina Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055GuangdongChina Department of Energy and Mineral Engineering Pennsylvania State University ParkPA 16802USA

In-situ upgrading by heating is feasible for low-maturity shale oil,where the pore space dynamically *** characterize this response for a heated substrate concurrently imaged by *** systematically follow the evolution of pore quantity,size(length,width and cross-sectional area),orientation,shape(aspect ratio,roundness and solidity)and their anisotropy—interpreted by machine *** indicate that heating generates new pores in both organic matter and inorganic ***,the newly formed pores are smaller than the original pores and thus reduce average lengths and widths of the bedding-parallel pore ***,the average pore lengths and widths are increased in the bedding-perpendicular ***,heating increases the cross-sectional area of pores in low-maturity oil shales,where this growth tendency fluctuates at300℃.In addition,the orientation and shape of the newly-formed heating-induced pores follow the habit of the original pores and follow the initial probability distributions of pore orientation and ***,limited anisotropy is detected in pore direction and shape,indicating similar modes of evolution both bedding-parallel and *** propose a straightforward but robust model to describe evolution of pore system in low-maturity oil shales during heating.

关键词： Low-maturity oil shale Pore elongation Organic matter pyrolysis In-situthermal upgrading Scanning electron microscopy(SEM) Machine learning

Effect of non-uniform swelling on coal multiphysics during gas injection: The triangle approach

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1362-1372页

作者： Yifan Huang Jishan Liu Yaoyao Zhao derek Elsworth Yee-Kwong Leong Department of Chemical Engineering School of EngineeringThe University of Western Australia35 Stirling HighwayWA 6009Australia State Key Laboratory of Coal Resources & Safe Mining China University of Mining& TechnologyBeijing100803China Department of Energy and Mineral Engineering G3 Centre and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA16802USA

In current dual porosity/permeability models,there exists a fundamental assumption that the adsorption-induced swelling is distributed uniformly within the representative elementary volume (REV),irrespective of its internal structures and transient ***,both internal structures and transient processes can lead to the non-uniform *** this study,we hypothesize that the non-uniform swelling is responsible for why coal permeability in experimental measurements is not only controlled by the effective stress but also is affected by the adsorption-induced *** propose a concept of the swelling triangle composed of swelling paths to characterize the evolution of the non-uniform swelling and serve as a core link in coupled multiphysics.A swelling path is determined by a dimensionless volumetric ratio and a dimensionless swelling *** swelling paths have the same start and end point,and each swelling path represents a unique swelling *** swelling path as the diagonal of the triangle represents the case of the uniform swelling while that as the two perpendicular boundaries represents the case of the localized *** paths of all intermediate cases populate inside the *** corresponding relations between the swelling path and the response of coal multiphysics are established by a non-uniform swelling *** define this method as the triangle approach and corresponding models as swelling path-based *** proposed concept and models are verified against a long-term experimental measurement of permeability and strains under constant effective *** results demonstrate that during gas injection,coal multiphysics responses have a close dependence on the swelling path,and that in both future experiments and field predictions,this dependence must be considered.

关键词： Transient process Heterogeneity Swelling triangle Swelling path Non-uniform swelling coefficient

Applying Machine Learning Approach to Explore Childhood Circumstances and Self-Rated Health in Old Age-China and the US,2020-2021

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第11期6卷 213-218,I0008-I0013页

作者： Shutong Huo derek Feng Thomas M.Gill Xi Chen Department of Health Society&BehaviorPublic HealthUniversity of CaliforniaIrvineCAUSA Department of Statistics and Data Science Yale UniversityNew HavenCTUS Department of Internal Medicine Yale School of MedicineNew HavenCTUS Department of Health Policy and Management Yale School of Public HealthNew HavenCTUS Department of Economics Yale UniversityNew HavenCTUS.

Introduction:Childhood circumstances impact senior health,prompting the introduction of machine learning methods to assess their individual and collective contributions to senior ***:Using health and retirement study(HRS)and China Health and Retirement Longitudinal Study(CHARLS),we analyzed 2,434 American and 5,612 Chinese participants aged 60 and *** inference trees and forests were employed to estimate the influence of childhood circumstances on self-rated health(SRH).Results:The conventional method estimated higher inequality of opportunity(IOP)values in both China(0.039,accounting for 22.67%of the total Gini coefficient 0.172)and the US(0.067,accounting for 35.08%of the total Gini coefficient 0.191).In contrast,the conditional inference tree yielded lower estimates(China:0.022,accounting for 12.79%of 0.172;US:0.044,accounting for 23.04%of 0.191),as did the forest(China:0.035,accounting for 20.35%of 0.172;US:0.054,accounting for 28.27%of 0.191).Childhood health,financial status,and regional differences were key determinants of senior *** conditional inference forest consistently outperformed others in predictive accuracy,as demonstrated by lower out-of-sample mean squared error(MSE).Discussion:The findings emphasize the need for early-life interventions to promote health equity in aging *** learning showcases the potential in identifying contributing factors.

关键词： collective inequality estimates

A CFD Model to Evaluate Near-Surface Oil Spill from a Broken Loading Pipe in Shallow Coastal waters

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第1期20卷 59-77页

作者： Portia Felix Lee Leon derek Gay Stefano Salon Hazi Azamathulla Department of Civil and Environmental Engineering The University of the West IndiesSt.AugustineTrinidad and Tobago National Institute of Oceanography and Experimental Geophysics-OGS TriesteItaly

Oil spills continue to generate various issues and concerns regarding their effect and behavior in the marine environment,owing to the related potential for detrimental environmental,economic and social *** is essential to have a solid understanding of the ways in which oil interacts with the water and the coastal ecosystems that are located *** study proposes a simplified model for predicting the plume-like transport behavior of heavy Bunker C fuel oil discharging downward from an acutely-angled broken pipeline located on the water *** results show that the spill overall profile is articulated in three major flow *** first,is the source field,i.e.,a region near the origin of the initial jet,followed by the intermediate or transport field,namely,the region where the jet oil flow transitions into an underwater oil plume flow and starts to move horizontally,and finally,the far-field,where the oil re-surface and spreads onto the shore at a significant distance from the spill *** behavior of the oil in the intermediate field is investigated using a simplified injection-type oil spill model capable of mimicking the undersea trapping and lateral migration of an oil plume originating from a negatively buoyant jet spill.A rectangular domain with proper boundary conditions is used to implement the *** Projection approach is used to discretize a modified version of the Navier-Stokes equations in two dimensions.A benchmark fluid flow issue is used to verify the model and the results indicate a reasonable relationship between specific gravity and depth as well as agreement with the aerial data and a vertical temperature profile plot.

关键词： CFD model Navier-Stokes equations projection method water surface oil spill shallow coastal waters

Elucidating microbial iron corrosion mechanisms with a hydrogenase-deficient strain of Desulfovibrio vulgaris

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

mLife 2024年第2期3卷 269-276页

作者： Di wang Toshiyuki Ueki Peiyu Ma Dake Xu derek R.Lovley Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyangChina Shenyang National Laboratory for Materials Science Northeastern UniversityShenyangChina Department of Microbiology University of MassachusettsAmherstMAUSA

Sulfate-reducing microorganisms extensively contribute to the corrosion of ferrous metal *** is substantial debate over their corrosion *** investigated Fe^(0) corrosion with Desulfovibrio vulgaris,the sulfate reducer most often employed in corrosion *** were grown with both lactate and Fe^(0) as potential electron donors to replicate the common environmental condition in which organic substrates help fuel the growth of corrosive ***^(0) was corroded in cultures of a *** hydrogenase-deficient mutant with the 1:1 correspondence between Fe^(0) loss and H_(2) accumulation expected for Fe^(0) oxidation coupled to H+reduction to H_(2).This result and the extent of sulfate reduction indicated that *** was not capable of direct Fe^(0)-to-microbe electron transfer even though it was provided with a supplementary energy source in the presence of abundant ferrous *** in the hydrogenase-deficient mutant cultures was greater than in sterile controls,demonstrating that H_(2) removal was not necessary for the enhanced corrosion observed in the presence of *** parental H_(2)-consuming strain corroded more Fe^(0) than the mutant strain,which could be attributed to H_(2) oxidation coupled to sulfate reduction,producing sulfide that further stimulated Fe^(0) *** results suggest that H_(2) consumption is not necessary for microbially enhanced corrosion,but H_(2) oxidation can indirectly promote corrosion by increasing sulfide generation from sulfate *** finding that *** was incapable of direct electron uptake from Fe^(0) reaffirms that direct metal-to-microbe electron transfer has yet to be rigorously described in sulfate-reducing microbes.

关键词： electrobiocorrosion electron transfer hydrogen transfer microbial corrosion sulfate-reducing microbes