检索结果-南通市图书馆

Responses in splanchnic and mammary amino acid metabolism to short-term graded removal of methionine in lactating goats

引用

Animal Nutrition 2023年第2期13卷 116-125页

作者： Yantao Li mark d.hanigan Xueyan Lin Zhiyong Hu Zhengui Yan Qiuling Hou Yun Wang Zhonghua Wang Ruminant Nutrition and Physiology Laboratory College of Animal Science and TechnologyShandong Agricultural UniversityTai'an 271018China department of dairy Science Virginia TechBlacksburg 24061USA

Four multi-catheterized lactating goats were used in a 4×4 Latin square experiment to investigate the responses of amino acid metabolism in portal-drained viscera(PdV),liver,and mammary glands to short-term varying supplies of methionine(Met).during the last 45 h in each experimental period,goats were fasted for 12 h and then abomasally infused with an amino acid(AA)mixture plus glucose for 33 *** consisted of graded removal of Met from an infused AA mixture to achieve Met content in the infusate of 100%(complete),60%,30%,or 0%that in *** Met removal decreased the pro-duction of milk,milk protein,lactose,and fat linearly whilst also decreasing arterial Met concentration linearly(PdV uptake and liver removal of Met decreased linearly(Pdue to decreased Met affinity of PdV and liver(P0.1)was maintained as Met supply *** was achieved through increased mammary affinity(Pd increased mammary blood flow(Pdecreased circu-lating Met *** removal of Met from the infusate linearly decreased mammary uptake-to-milk output ratios of Met(Pd tended to decrease essential amino acid(EAA)linearly(0.05decreased circulating concentration of prolactin and linearly increased insulin concentration(Pdy indicated there were several mechanisms used to mitigate a Met deficiency,including reduced catabolism of Met in PdV,liver,and peripheral tissue(including mammary glands)and a linear increase in mammary blood *** observed decreases in milk protein production as Met supply decreased appear to be a result of regulatory events which may have been driven by decreased circulating prolactin,rather than as a result of decreased mammary Met uptake.

关键词： Methionine Lactating goat Milk protein Amino acid Splanchnic tissue

来源：

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

Emerging role of A-kinase anchoring protein 5 signaling in reward circuit function

引用

Neural Regeneration Research 2025年第10期20卷 2913-2914页

作者： William J.Flerlage mark L.dell’Acqua Brian M.Cox Fereshteh S.Nugent Uniformed Services University of the Health Sciences Department of Pharmacology and Molecular TherapeuticsBethesdaMDUSA department of Pharmacology University of Colorado School of MedicineAnschutz Medical CampusAuroraCOUSA

There is a strong evidence supporting the hypothesis of synaptic dysfunction as a major contributor to neural circuit and network disruption underlying emotional and mood dysregulation in psychiatric disorders(Simmons et al.,2024).diverse sets of distinct molecular signaling pathways converge on the synapse to regulate synaptogenesis,synaptic function,and synaptic plasticity in brain regions and circuits through complex interactions organized by numerous multivalent protein scaffolds,including the family of proteins known as A-kinase anchoring proteins(AKAPs).

关键词： function supporting

来源：

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

Addressing nonresponse bias in forest inventory change estimation using response homogeneity classifications

引用

Forest Ecosystems 2023年第1期10卷 125-131页

作者： James A.Westfall mark d.Nelson U.S.Forest Service Northern Research StationYorkPAUSA U.S.Forest Service Northern Research StationSt.PaulMNUSA

Estimating amounts of change in forest resources over time is a key function of most national forest inventories(NFI). As this information is used broadly for many management and policy purposes, it is imperative that accurate estimations are made from the survey sample. Robust sampling designs are often used to help ensure representation of the population, but often the full sample is unrealized due to hazardous conditions or possibly lack of land access permission. Potentially, bias may be imparted to the sample if the nonresponse is nonrandom with respect to forest characteristics, which becomes more difficult to assess for change estimation methods that require measurements of the same sample plots at two points in time, i.e., remeasurement. To examine potential nonresponse bias in change estimates, two synthetic populations were constructed: 1) a typical NFI population consisting of both forest and nonforest plots, and 2) a population that mimics a large catastrophic disturbance event within a forested population. Comparisons of estimates under various nonresponse scenarios were made using a standard implementation of post-stratified estimation as well as an alternative approach that groups plots having similar response probabilities(response homogeneity). When using the post-stratified estimators, the amount of change was overestimated for the NFI population and was underestimated for the disturbance population, whereas the response homogeneity approach produced nearly unbiased estimates under the assumption of equal response probability within groups. These outcomes suggest that formal strategies may be needed to obtain accurate change estimates in the presence of nonrandom nonresponse.

关键词： disturbance Post-stratification Land use conversion Sample bias

来源：

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

Sex-specific life-history strategies among immature jumping spiders:differences in body parameters and behavior

引用

Current Zoology 2023年第5期69卷 535-551页

作者： LászlóMezőfi Viktor markó dóraÁgnes Taranyi Gábor markó Institute of Plant Protection Hungarian University of Agriculture and Life SciencesBudapest 1118Hungary Institute of Viticulture and Enology Hungarian University of Agriculture and Life SciencesBudapest 1118Hungary

Selection forces often generate sex-specific differences in various traits closely related to *** in adult spiders(Araneae),sexes often differ in coloration,body size,antipredator,or foraging behavior,such sex-related differences are less pronounced among ***,sex-specific life-history strategies may also be adaptive for ***,we hypothesized that among spiders,immature individuals show different life-history strategies that are expressed as sex-specific differences in body parameters and behavioral features,and also in their *** used immature individuals of a protandrous jumping spider,Carrhotus xanthogramma,and examined sex-related *** results showed that males have higher mass and larger prosoma than *** were more active and more risk tolerant than *** activity increased with time,and larger males tended to capture the prey faster than small ones,while females showed no such ***,females reacted to the threatening abiotic stimuli more with the increasing number of test *** both males and females,individuals with better body conditions tended to be more risk *** showed no sex-specific differences in interindividual behavioral consistency and in intraindividual behavioral variation in the measured behavioral ***,we also found evidence for behavioral syndromes(i.e.,correlation between different behaviors),where in males,only the activity correlated with the risk-taking behavior,but in females,all the measured behavioral traits were *** present study demonstrates that *** sexes follow different life-history strategies even before attaining maturity.

关键词： activity behavioral syndrome boldness intraindividual variability repeatability sexual dimorphism

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical modelling of high-temperature superconducting dynamos:A review

引用

Superconductivity 2023年第1期5卷 1-16页

作者： mark d Ainslie department of Engineering King’s College LondonStrandLondon WC2R 2LSUnited Kingdom

The high‐temperature superconducting(HTS)dynamo enables injection of large dC currents into a superconducting coil,without the need for thermally‐inefficient current *** of this important advantage,there is significant interest in using such technology to energise superconducting coils in superconducting rotating machines and NMR/MRI *** the extensive experimental work carried out over the past decade,there was–until very recently–considerable confusion and debate regarding the physical origin of the HTS dynamo’s dC output *** modelling has played a key role in elucidating the underlying physics of such devices and several different numerical models have now been developed as useful and cost‐effective tools to not only explain and further examine experimental results,but also optimise and improve dynamo *** review summarises all of the developments in this important area over recent years,including modelling the open‐circuit voltage behaviour in 2d and 3d,the definition of a new benchmark problem for the HTS modelling community,investigating key dynamo parameters,modelling dynamic coil charging behaviour and calculating losses.A view towards the future is provided,including the outstanding challenges and the developments required to address these.

关键词： HTS modelling HTS dynamo HTS flux pump High temperature superconductors Numerical simulation Finite‐element method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genomic insights into hybridization in a localized region of sympatry between pewee sister species(Contopus sordidulus × C. virens) and their chromosomal patterns of differentiation

引用

Chinese Birds 2016年第1期7卷 48-55页

作者： Joseph d.Manthey mark B.Robbins Biodiversity Institute University of Kansas department of Ecology and Evolutionary Biology University of Kansas

Background: The Great Plains of the United States includes a large number of hybrid and contact zones between bird species. The amount of gene flow between sister species in these zones ranges from very rare hybridization events to widespread and prevalent introgression. Some of these avian systems have been studied extensively, while others have been indeterminate of whether hybridization exists in areas of sympatry. Using genomic-level approaches allows investigation of genomic patterns of hybridization and gene flow between species—or lack ***: We investigated a narrow zone of sympatry in Nebraska, USA between pewee species(Contopus sordidulus and C. virens), for which no hybridization has been confirmed. We used thousands of single nucleotide polymorphisms to identify potential hybridization and investigate genomic patterns of differentiation between these two ***: We found evidence of multiple hybrid individuals in the contact zone. Little genomic variation was fixed between species, but a large proportion had differentiated allele frequencies between species. There was a positive relationship between genetic differentiation and chromosome ***: We provided the first conclusive evidence of hybridization between C. sordidulus and C. virens, in a region where secondary contact likely occurred due to human disturbance and habitat modification. The genomic patterns of differentiation affirm that these species split in the relatively recent past. Finally, the relationship of chromosome size and genetic differentiation may have resulted from differential rates of chromosomal recombination in songbirds and genetic differentiation between species largely due to genetic drift(possibly in concert with selection).

关键词： Contact zone Hybrid zone Hybridization Chromosomal patterns Next-generation sequencing Contopus North America

来源：

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

Statistical variability and fragility assessment of ballistic perforation of steel plates for 7.62 mm AP ammunition

引用

defence Technology（防务技术） 2020年第3期16卷 503-513页

作者： mark G.Stewart Michael dNetherton Centre for Infrastructure Performance and Reliability The University of NewcastleNew South Wales2038Australia

The paper describes field test results of 7.62×51 mm M61 AP(armour piercing) ammunition fired into mild steel targets at an outdoor *** targets varied from 10 mm to 32 mm in *** tests recorded penetration depth,probability of perforation(i.e.,complete penetration),muzzle and impact velocities,bullet mass,and plate yield strength and *** measured penetration depth exhibited a variability of approximately±12%.The paper then compared ballistic test results with predictive models of steel penetration depth and thickness to prevent *** parameters were derived for muzzle and impact velocity,bullet mass,plate thickness,plate hardness,and model error.A Monte-Carlo probabilistic analysis was then developed to estimate the probability of plate perforation of 7.62 mm M61 AP ammunition for a range of impact velocities,and for mild steels,and High Hardness Armour(HHA) *** perforation fragility analysis considered the random variability of impact velocity,bullet mass,plate thickness,plate hardness,and model *** a probabilistic analysis allows for reliability-based design,where,for example,the plate thickness with 95% reliability(*** 1 in 20 shots will penetrate the wall) can be estimated knowing the probabilistic distribution of ***,it was found that the plate thickness to ensure a low 5% probability of perforation needs to be 11-15% thicker than required to have a 50/50 chance of perforation for mild steel *** would need to be 20-30% thicker if probability of perforation is reduced to zero.

关键词： Ballistics Probability Statistics Steel plates Armour steel Ammunition Experimental Perforation

来源：

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

Assessing the impact of conceptual mineral systems uncertainty on prospectivity predictions

引用

Geoscience Frontiers 2022年第6期13卷 182-207页

作者： mark d Lindsay Agnieszka M.Piechocka mark W Jessell Richard Scalzo Jeremie Giraud Guillaume Pirot Edward Cripps Commonwealth Scientific and Industrial Research Organisation Mineral Resources Australian Resources Research CentreWA 6151Australia Mineral Exploration Cooperative Research Centre Centre for Exploration TargetingSchool of Earth SciencesThe University of Western AustraliaPerthWA 6009Australia ARC Centre for data Analytics for Resources and Environments(dARE) Perth and SydneyAustralia University of Sydney School of Mathematics and StatisticsSydneyAustralia Universitéde Lorraine GeoRessourcesCNRS54000 NancyFrance The University of Western Australia Department of Mathematics and StatisticsPerthAustralia

The past two decades have seen a rapid adoption of artificial intelligence methods applied to mineral exploration. More recently, the easier acquisition of some types of data has inspired a broad literature that has examined many machine learning and modelling techniques that combine exploration criteria,or ’features’, to generate predictions for mineral prospectivity. Central to the design of prospectivity models is a ’mineral system’, a conceptual model describing the key geological elements that control the timing and location of economic mineralisation. The mineral systems model defines what constitutes a training set, which features represent geological evidence of mineralisation, how features are engineered and what modelling methods are used. Mineral systems are knowledge-driven conceptual models, thus all parameter choices are subject to human biases and opinion so alternative models are ***, the effect of alternative mineral systems models on prospectivity is rarely compared despite the potential to heavily influence final predictions. In this study, we focus on the effect of conceptual uncertainty on Fe ore prospectivity models in the Hamersley region, Western Australia. Four important considerations are tested.(1) Five different supergene and hypogene conceptual mineral systems models guide the inputs for five forest-based classification prospectivity models model.(2) To represent conceptual uncertainty, the predictions are then combined for prospectivity model comparison.(3)Representation of three-dimensional objects as two-dimensional features are tested to address commonly ignored thickness of geological units.(4) The training dataset is composed of known economic mineralisation sites(deposits) as ’positive’ examples, and exploration drilling data providing ’negative’sampling locations. Each of the spatial predictions are assessed using independent performance metrics common to AI-based classification methods and subjected to geological pl

关键词： Uncertainty Modelling Prospectivity Economic geology Geological plausibility Forest-based classification

来源：

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

Protecting miners from coal bursts during development above historic mine workings in Harlan County,KY

引用

International Journal of Mining Science and Technology 2021年第1期31卷 111-116页

作者： Christopher mark Mine Safety and Health Administration PittsburghPA 15236USA

In order to reach a large,untapped reserve of high-quality coal,d8 Cloverlick Mine proposed to mine a corridor nearly 600 m deep beneath the Benham Spur of Black Mountain,Kentucky’s highest peak.d8 Cloverlick Mine was extracting the Owl seam,but the corridor’s route lay approximately 20 m above century-old mine workings in the C–(darby)*** to the concern,three serious coal bursts had recently occurred in nearby Owl seam *** of the old workings seemed to indicate that the underlying C–seam had been fully ***,two of the coal bursts had occurred above areas where the C–Seam was also shown as mined *** Safety and Health Administration(MSHA)Technical Support therefore investigated the records of past mining to better understand the old mine *** conditions observed in current Owl seam workings were also compared with the maps of the old C–seam *** study concluded that the presence of hazardous underlying remnants could not be ruled *** mitigate the burst risk,d8 Cloverlick Mine adopted a strategy of stress probe drilling.A self-propelled coal drill was used to auger 11.5-m-long,small diameter holes in advance of *** each hole was drilled,the cuttings were measured to detect the presence of highly stressed *** the crossing was successfully completed without incident.

关键词： Coal bursts Underground mining Room-and-pillar destressing

来源：

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

Rapid range expansion predicted for the Common Grackle(Quiscalus quiscula)in the near future under climate change scenarios

引用

Avian Research 2021年第4期12卷 569-575页

作者： Peter Capainolo Utku Perktaş mark dEFellowes division of Vertebrate Zoology-department of Ornithology American Museum of Natural HistoryCentral Park West@79th StreetNew YorkNY 10024-5192USA People and Wildlife Research Group School of Biological SciencesUniversity of ReadingWhiteknightsReading RG66ASUK depart-ment of Biology(Zoology Section Biogeography Research Laboratory)Faculty of ScienceHacettepe UniversityBeytepe06800 AnkaraTurkey

Background:Climate change due to anthropogenic global warming is the most important factor that will affect future range distribution of species and will shape future biogeographic *** much effort has been expended in understanding how climate change will affect rare and declining species we have less of an understanding of the likely consequences for some abundant *** Common Grackle(Quiscalus quiscula;Linnaeus 1758),though declining in portions of its range,is a widespread blackbird(Icteridae)species in North America east of the Rocky *** study examined how climate change might affect the future range distribution of Common ***:We used the R package Wallace and six general climate models(ACCESS1-0,BCC-CSM1-1,CESM1-CAM5-1-FV2,CNRM-CM5,MIROC-ESM,and MPI-ESM-LR)available for the future(2070)to identify climatically suitable areas,with an ecological niche modelling approach that includes the use of environmental ***:Future projections suggested a significant expansion from the current range into northern parts of North America and Alaska,even under more optimistic climate change ***,there is evidence of possible future colonization of islands in the Caribbean as well as coastal regions in eastern Central *** most important bioclimatic variables for model predictions were Annual Mean Temperature,Temperature Seasonality,Mean Temperature of Wettest Quarter and Annual ***:The results suggest that the Common Grackle could continue to expand its range in North America over the next 50 *** research is important in helping us understand how climate change will affect future range patterns of widespread,common bird species.

关键词： Annual mean temperature Climate change Common Grackle Ecological niche modelling Range shift Seasonality

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：