检索结果-南通市图书馆

小麦的异源染色体代换及其部分同源性测定的快速技术

在线全文

学校读者我要写书评

暂无评论

麦类作物学报 1987年第4期 14-18+49页

作者： Rama S.kota ,jan dvoák ,傅杰

前言一般产生小麦异源二体附加系的标准技术,是通过小麦与杂种或双倍数体回交选择单体附加系(O'Mara,1940).但这一技术所产生的二体附加系速度慢,程序麻烦,而且还有一个很大的障碍是,异源染色体的结构经常发生变化.为了缩短和简化异源... 详细信息

前言一般产生小麦异源二体附加系的标准技术,是通过小麦与杂种或双倍数体回交选择单体附加系(O'Mara,1940).但这一技术所产生的二体附加系速度慢,程序麻烦,而且还有一个很大的障碍是,异源染色体的结构经常发生变化.为了缩短和简化异源染色体结合到小麦

关键词：高大山羊草异源染色体随体染色体中国春染色体代换双端体小麦麦类作物二体代换系同源性

Oligodendroglial heterogeneity in health,disease,and recovery:deeper insights into myelin dynamics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第11期20卷 3179-3192页

作者： Pieter-jan Serneels Julie D.De Schutter Lies De Groef Lieve Moons Steven Bergmans kU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionNeural Circuit Development&Regeneration Research GroupLeuvenBelgium kU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionCellular Communication&Neurodegeneration Research GroupLeuvenBelgium

Decades of research asserted that the oligodendroglial lineage comprises two cell types:oligodendrocyte precursor cells and ***,recent studies employing single-cell RNA sequencing techniques have uncovered novel cell states,prompting a revision of the existing *** forward,the oligodendroglial lineage should be delineated into five distinct cell states:oligodendrocyte precursor cells,committed oligodendrocyte precursor cells,newly formed oligodendrocytes,myelin-forming oligodendrocytes,and mature *** new classification system enables a deeper understanding of the oligodendroglia in both physiological and pathological *** this uniform terminology will facilitate comparison and integration of data across ***,including the consolidation of findings from various demyelinating models,is essential to better understand the pathogenesis of demyelinating ***,comparing injury models across species with varying regenerative capacities can provide insights that may lead to new therapeutic strategies to overcome remyelination ***,by standardizing terminology and synthesizing data from diverse studies across different animal models,we can enhance our understanding of myelin pathology in central nervous system disorders such as multiple sclerosis,Alzheimer's disease,and amyotrophic lateral sclerosis,all of which involve oligodendroglial and myelin dysfunction.

关键词： animal models demyelination fish mammals multiple sclerosis myelin neurodegeneration oligodendrocytes oligodendroglial lineage remyelination

Weak influence of natural vegetation in urban green spaces compared to agricultural ecosystems on House Martin populations:Insights from nationwide citizen science data in the Czech Republic

在线全文

学校读者我要写书评

暂无评论

Avian Research 2024年第2期15卷 139-146页

作者： Denisa dvorakova jan Sipos Josef Suchomel Department of Zoology FisheriesHydrobiology and ApicultureMendel University in BrnoZemedelska 161300BrnoCzech Republic

The House Martin(Delichon urbicum)is a common farmland bird species in the European landscape,yet its population numbers are currently in ***,it is not yet sufficiently explained why this long-term decline *** fill this gap in our knowledge,we investigated how land cover composition affects the abundance of House Martins on the landscape scale by using nationwide citizen science *** a generalised linear mixed-effect model(GLMM),we evaluated 12,094 records from the Czech Republic spanning *** analysis underscores the significance of land cover type in shaping House Martin *** specifically,our results indicate that within agricultural land covers“naturally managed arable lands”exhibited significant positive effect,while forests,orchards,and vineyards were deemed less favourable for House Martin *** urban land covers,we found a clear distinction in the impact on House Martin populations,with a positive effect observed in urban infrastructure,development areas,and post-industrial sites(i.e.,UrbanAreas),while an indifferent impact was noted within urban green spaces and landscaped areas(i.e.,GreenUrban).Notably,our findings suggest that the simple spatial,age,and species structure typical of forests in Europe,and similarly,the uniform structure of parks and gardens,may be responsible for the decline in the abundance of the House *** advocate for the preservation or enhancement of urban greenery,expansion of natural vegetation in rural areas and adoption of ecological management practices in orchards and vineyards to mitigate further declines in House Martin populations.

关键词： Citizen science Habitat preferences House Martin Species distribution Urban and suburban landscape

Impact of agricultural landscape structure on the patterns of bird species diversity at a regional scale

在线全文

学校读者我要写书评

暂无评论

Avian Research 2023年第4期14卷 600-610页

作者： Denisa dvorakova jan Sipos Josef Suchomel Department of Zoology FisheriesHydrobiology and ApicultureMendel University in BrnoZemedelska 161300BrnoCzech Republic

The loss of bird species diversity is a crucial problem in the European agricultural *** in the area coverage of major land cover types has been mentioned as one of the main factors responsible for bird biodiversity *** this study,we focused on the impact of landscape matrix characteristics on bird species richness and on Faith’s phylogenetic diversity index on a spatial scale of 1000-m radius around the measured occurrence *** investigated how land cover composition affects bird diversity on the landscape scale using nationwide citizen science *** total,168,739 records of bird occurrence in the South Moravian Region of the Czech Republic during growing season from 2009 to 2019 were *** found that the presence of water bodies and wetlands significantly corresponded to the areas of highest bird species *** also revealed that the presence of forests(~60%of the forest in the Czech Republic is occupied by commercial forests),urban areas and arable land were negatively associated with bird species richness and phylogenetic ***(both coniferous and deciduous)and urban habitats were found to have a tendency to host a clustered phylogenetic community structure in comparison with wetland and arable land.A strong negative association between forest proportion and bird diversity led us to conclude that the expansion of the forest(with simple species composition,horizontal and vertical structure)could be one of the critical drivers of the decline of bird species diversity in the European agricultural *** the other hand,our results also pointed out that small woody features(i.e.,woodlots)and scattered woodland shrub vegetation were one of the main landscape characteristics supporting a bird diversity in rural *** is in concordance with other studies which mention these landscape structures as important elements for nesting and foraging of farmland *** thus recommend to maintain and restor

关键词： Bird occurrence Citizen science Conservation Landscape influence Phylogenetic diversity Spatial heterogeneity

Medical implants by using RP and investment casting technologies

在线全文

学校读者我要写书评

暂无评论

China Foundry 2011年第1期8卷 107-111页

作者： Milan Horáek Ondej Charvát Tomá Pavelka Josef Sedlák Martin Madaj Jindich Nejedl jan dvoáek Faculty of Mechanical Engineering Institute of Manufacturing Technology-Department of Foundry EngineeringBrno University of Technology

The paper deals with the production technology of knee joint replacement by using rapid prototyping *** aim of the work is to outline the manufacturing technology intended for prototype production with the use of rapid prototyping and investment casting technology for use in orthopaedics and the surgery of knee joint *** research results should make an effective contribution in the attempts to minimize the invasive surgical procedure,shorten the production of knee joint replacement as well as reduce the *** present,the research is focused on the preparation of STL data from CT (Computed Tomography) and verification of the production technology of prototypes made using available RP technology and its evaluation.

关键词： rapid prototyping investment casting knee joint replacement computed tomography

Impact of atmospheric turbulence on coherent beam combining for laser weapon systems

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第4期17卷 1160-1167页

作者： jan k.Jabczyński Przemysław Gontar Military University of Technology Gen.S.Kaliskiego 2Warsaw00-908Poland

The performance of a laser weapon system based on coherent beam combining(CBC)depends on its propagation properties in the *** this study,an analytical model based on partial coherent beam combining(PCBC)for assumed coherence coefficients between beams in a CBC lattice was *** kolmogorov model of atmospheric turbulence and the Hufnagel-Valley model of C^(2)_(n) dependence on atmospheric parameters were *** simplified metrics were proposed to assess the CBC *** beam profiles(super-Gaussian,truncated Gaussian,etc.)and geometries were analyzed in terms of maximal intensity in the far *** approximate formula for PCBC efficiency dependent on the Fried radius was *** results of CBC modeling were compared to those of the Gaussian beam propagation model in a turbulent *** dependence of CBC performance on the C^(2)_(n) parameter,range,and elevation angle was *** could be concluded that the application of CBC for medium and long range propagation is impractical without an effective adaptive optics system.

关键词： Laser beams Beam combining Coherence Atmosphere turbulences

New wormhole model with quasi-periodic oscillations exhibiting conformal motion in f(T,T)gravity

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第9期75卷 59-68页

作者： G Mustafa Abdelghani Errehymy S k Maurya Munsif jan Department of Physics Zhejiang Normal UniversityJinhua 321004China Astrophysics Research Centre School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X54001Durban 4000South Africa Laboratory of High Energy Physics and Condensed Matter Department of PhysicsFaculty of Sciences Aïn ChockHassan II University of CasablancaB.P.5366 MaarifCasablanca 20100Morocco Department of Mathematical and Physical Sciences College of Arts and ScienceUniversity of NizwaNizwaOman New Uzbekistan University Mustaqillik Ave.54Tashkent 100007Uzbekistan

This analysis explores the new wormhole(WH)solution in the background of teleparallel gravity with minimal matter *** complete this study,we consider the conformal symmetry with non-zero killing *** exact shape function is computed by considering the linear equation of state with the phantom *** energy conditions are investigated for the calculated shape function with the equation of state *** presence of exotic matter is confirmed due to the violation of the null energy *** current study also explores the physical properties of the epicyclic frequencies with quasi-periodic *** the astrophysical,epicyclic frequencies are extensively employed to explore the self-gravitating *** is concluded that a stable WH solution is acceptable for WH geometry.

关键词： extended teleparallel theory wormhole solutions epicyclic frequencies conformal symmetry

The effect of climate factors on the size of forest wildfires(case study:Prague-East district,Czech Republic)

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2022年第4期33卷 1291-1300页

作者： Zohreh Mohammadi Peter Lohmander jan kašpar Roman Berčák Jaroslav Holuša Robert Marušák Faculty of Forestry and Wood Sciences Czech University of Life Sciences PragueKamýcká12916500 Praha-SuchdolCzech Republic Optimal Solutions in Cooperation with Linnaeus University UmeaSweden

This paper presents a new approach to identifying the climate variables that influence the size of the area burned by forest *** linear regression was used in combination with nonlinear variable transformations to determine relevant nonlinear forest wildfire size *** from the Prague-East District of the Czech Republic was used for model *** burned forest area was hypothesized as a function of water vapor pressure,air temperature and wind *** speed was added to enhance predictions of the size of forest wildfires,and further improvements to the utility of prediction methods were added to the regression *** results show that if the air temperature increases,it may contain less water and the fuel will become *** size of the burned area then *** the relative humidity in the air increases and the wind speed decreases,the size of the burned area is *** model suggests that changes in the climate factors caused by ongoing climate change could cause significant changes in the size of wildfire in forests.

关键词： Climatic variables Burned forest area Climate change Multiple linear regression

Fecal microbiome of growing pigs fed a cereal based diet including chicory(Cichorium intybus L.) or ribwort(Plantago lanceolata L.) forage

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2016年第2期7卷 167-175页

作者： Johan Dicksved janet k.jansson jan Erik Lindberg Department of Animal Nutrition and Management Swedish University of Agricultural Sciences Department of Microbiology Swedish University of Agricultural Sciences Division of Biology Earth and Biological Sciences Pacific Northwest National Laboratories

Background： The purpose of this study was to investigate how inclusion of chicory forage or ribwort forage in a cereal-based diet influenced the fecal microbial community（microbiome） in newly weaned（35 days of age） *** piglets were fed a cereal-based diet without（B） and with inclusion（80 and 160 g/kg air-dry forage） of vegetative shoots of chicory（C） and leaves of ribwort（R） forage in a 35-day growth trial. Fecal samples were collected at the start（D0）, 17（D17） and 35（D35） days after weaning and profiles of the microbial consortia were generated using terminal restriction fragment length polymorphism（T-RFLP）. 454-FLX pyrosequencing of 16 S r RNA gene amplicons was used to analyze the microbial composition in a subset of the samples already analyzed with ***： The microbial clustering pattern was primarily dependent on age of the pigs, but diet effects could also be observed. Lactobacilli and enterobacteria were more abundant at D0, whereas the genera Streptococcus, Treponema,Clostridium, Clostridiaceae1 and Coprococcus were present in higher abundances at D35. Pigs fed ribwort had an increased abundance of sequences classified as Treponema and a reduction in lactobacilli. However, the abundance of Prevotellaceae increased with age in on both the chicory and the ribwort diet. Moreover, there were significant correlations between the abundance of Bacteroides and the digested amount of galactose, uronic acids and total non-starch polysaccharides, and between the abundance of Bacteroidales and the digested amount of ***： This study demonstrated that both chicory and ribwort inclusion in the diet of newly weaned pigs influenced the composition of the fecal microbiota and that digestion of specific dietary components was correlated with species composition of the microbiota. Moreover, this study showed that the gut will be exposed to a dramatic shift in the microbial community structure several weeks after weaning.

关键词： Amplicon sequencing Chicory Microbiome Ribwort Uronic acid Weaning 16S