检索结果-南通市图书馆

Factors acting on the distribution region of Carlemanniaceae:Rainfall,temperatureand the plants' biological characteristics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第A02期52卷 244-250页

作者： yang xue lu shugang zhang yiping peng hua hou siming institute of ecology and geobotany Yunnan University Kunming 650091 China Key Laboratory of Biodiversity and Biogeography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Mengla 666303 China

在东亚和热带亚洲的家庭 Carlemanniaceae，包括二个类， Carlemannia 和 Silvianthus，主要沿着 Himalaya 山的南部的脚和云南高原的西方、南部的接口被散布。为 Carlemannia 四角形的主要繁殖过程一被授粉实验在这个工作作为自花受粉... 详细信息

在东亚和热带亚洲的家庭 Carlemanniaceae，包括二个类， Carlemannia 和 Silvianthus，主要沿着 Himalaya 山的南部的脚和云南高原的西方、南部的接口被散布。为 Carlemannia 四角形的主要繁殖过程一被授粉实验在这个工作作为自花受粉验证。为两 C 的种子的萌芽率。当种子在二个月以后是镇定的时， and Silvianthus bracteatus 能百分之百到达的四角形，当率减少了到 25% 时当收集发生在上一年时。种子没有休眠阶段，这被发现，并且他们的种子银行具有短暂土壤类型。在地观察，为水果的裂开地位证明他们的种子不能被囊为疏开有效地逐出。在从年分析温度和降雨数据以后 1971～2000 ，它被看那年度降雨，最低吝啬的月刊一年里的温度，和在一个月内的极端最低温度在 Carlemanniaceae 的分发范围上有大效果，当吝啬的年度温度有更小的效果时。Carlemanniaceae 的狭窄的分发范围被多重因素影响，例如短花粉疏开距离和短暂土壤种子银行。Carlemanniaceae 的人口尺寸被降雨的水平，不是由任何单个变量容易也影响。

关键词：生物学特征植物分配模式降雨量

CCDC181 is required for sperm flagellum biogenesis and male fertility in mice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Zoological Research 2024年第5期45卷 1061-1072页

作者： Xiang-Jun zhang Xiao-Ning hou Jian-Teng Zhou Bao-lu Shi Jing-Wei Ye Meng-Lei yang Xiao-hua Jiang Bo Xu Li-Min Wu Qing-hua Shi Division of Reproduction and Genetics First Affiliated Hospital of University of Science and Technology of China(USTC)Hefei National Laboratory for Physical Sciences at MicroscaleSchool of Basic Medical SciencesDivision of Life Sciences and MedicineBiomedical Sciences and Health Laboratory of Anhui ProvinceInstitute of Health and MedicineHefei Comprehensive National Science CenterUniversity of Science and Technology of ChinaHefeiAnhui 230001China

The structural integrity of the sperm flagellum is essential for proper sperm *** defects can result in male infertility,yet the precise mechanisms underlying this relationship are not fully ***181,a coiled-coil domain-containing protein,is known to localize on sperm flagella and at the basal regions of motile *** this knowledge,the specific functions of CCDC181 in flagellum biogenesis remain *** this study,Ccdc181 knockout mice were *** absence of CCDC181 led to defective sperm head shaping and flagellum ***,the Ccdc181 knockout mice exhibited extremely low sperm counts,grossly aberrant sperm morphologies,markedly diminished sperm motility,and typical multiple morphological abnormalities of the flagella(MMAF).Additionally,an interaction between CCDC181 and the MMAF-related protein LRRC46 was identified,with CCDC181 regulating the localization of LRRC46 within sperm *** findings suggest that CCDC181 plays a crucial role in both manchette formation and sperm flagellum biogenesis.

关键词： Male infertility CCDC181 MMAF Spermiogenesis Flagellum biogenesis

Tunable near-infrared light emission from layered TiS_(3) nanoribbons

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2024年第4期19卷 103-111页

作者： Junrong zhang Cheng Chen Yanming Wang yang lu Honghong Li Xingang hou Yaning Liang Long Fang Du Xiang Kai zhang Junyong Wang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Frontier institute of Chip and System Fudan UniversityShanghai 200438China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China College of Energy&Power Engineering Inner Mongolia University of TechnologyHohhot 010051China

The low-dimensional light source shows promise in photonic integrated *** layered van der Waals material that exhibits luminescence in the near-infrared optical communication waveband is an essential component in on-chip light ***,the tunable near-infrared photoluminescence(PL)of the air-stable layered titanium trisulfide(TiS3)is *** with iodine particles as a transport agent,TiS3 grown by chemical vapor transport using sulfur powder as a transport agent has fewer sulfur vacancies,which increases the luminescence intensity by an order of *** PL emission wavelength can be regulated in the near-infrared regime by thickness *** addition,we observed an interesting anisotropic strain response of PL in layered TiS3 nanoribbon:a blue shift of PL was achieved when the uniaxial tensile strain was applied along the b-axis,while a negligible shift was observed when the strain was applied along the *** work reveals the tunable nearinfrared luminescent properties of TiS3 nanoribbons,suggesting their potential applications as near-infrared light sources in photonic integrated circuits.

关键词： titanium trisulfide near-infrared luminescence S-vacancy tunability strain engineering

Shallow sub-lakes are essential for sustaining the successful wintering of waterbirds in Poyang Lake,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

Avian Research 2024年第2期15卷 219-228页

作者： Mengjie lu Zhen zhang peng Chen Changxin Xu Bin Gao luzhang Ruan School of Life Sciences Nanchang UniversityNanchang330031China Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity Center for Watershed EcologyInstitute of Life Science and School of Life SciencesNanchang UniversityNanchang330031China

For migratory waterbirds,the quality of wintering habitat is related to spring migration and successful breeding in the next *** availability of food resources in the habitat is critical and varies within water *** the water-level fluctuations in Poyang Lake have been extremely variable interannually in recent years,the wintering waterbird populations have remained relatively ***,the mechanism of maintaining the stability is worth *** study aimed to compare the distribution of vegetation and herbivorous wa-terbirds in 2015-2016 and 2016-2017,focusing on three shallow sub-lakes and one main lake *** results showed that the emergence of tubers and the growth of Carex *** a continuous food supply and habitat for wintering waterbirds with a gradual decline in the water *** sub-lakes supported almost all of the tuber-eating waterbirds(1.42-1.62×10^(5))and most geese(1.34-1.53×10^(6)).However,the main lake area,covered with Persicaria hydropiper,did not provide adequate and accessible *** resulted in almost no distribution of tuber-eating waterbirds,with only a few geese congregating in early *** results demonstrated that the shallow sub-lakes under human control provided a different environment from the main lake and are key to sustaining the successful wintering of hundreds of thousands of migratory waterbirds in Poyang ***,we recommend refining the anthropogenic management of the shallow sub-lakes to regulate the water level to ensure the carrying capacity of Poyang Lake.

关键词： Anthropogenic management Carrying capacity Seasonal lake Water level Wintering habitat

Bending Failure Mode and Prediction Method of the Compressive Strain Capacity of A Submarine Pipeline with Dent Defects

在线全文

学校读者我要写书评

暂无评论

china Ocean Engineering 2024年第4期38卷 636-647页

作者： hou Fu-heng JIA lu-sheng CHEN Yan-fei zhang Qi ZHONG Rong-feng WANG Chun-sha School of Mechanical and Transportation Engineering China University of PetroleumBeijingBeijing 102249China CNOOC Research institute Ltd.Beijing 100028 China

A dent is a common type of defects for submarine *** submarine pipelines,high hydrostatic pressure and internal pressure are the main *** pipelines bend due to complex subsea conditions,the compression strain capacity may be *** into the local buckling failure and accurate prediction of the compressive strain capacity are important.A finite element model of a pipeline with a dent is *** buckling failure under a bending moment is investigated,and the compressive strain capacity is *** effects of different parameters on pipeline local buckling are *** results show that the dent depth,external pressure and internal pressure lead to different local buckling failure modes of the pipeline.A higher internal pressure indicates a larger compressive strain capacity,and the opposite is true for external *** the ratio of external pressure to collapse pressure of intact pipeline is greater than 0.1,the deeper the dent,the greater the compressive strain capacity of the *** as the ratio is less than 0.1,the opposite is *** the basis of these results,a regression equation for predicting the compressive strain capacity of a dented submarine pipeline is proposed,which can be referred to during the integrity assessment of a submarine pipeline.

关键词： submarine pipeline dent defect bending load local buckling compressive strain capacity

Factors acting on the distribution region of Carlemanniaceae:Rainfall,temperatureand the plants' biological characteristics

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2007年第S2期 244-250页

作者： yang xue~(1,2) lu shugang~1 zhang yiping~3.peng hua~(2+) hou siming~1 1 institute of ecology and geobotany,yunnan university,kunming 650091,china 2 Key Laboratory of Biodiversity and Biogeography,kunming institute of Botany,Chinese Academy of Sciences,kunming 650204,china 3 Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla 666303,china

The family Carlemanniacese in East Asia and tropical Asia,comprising two genera,Carlemannia and Silvianthus,are mainly distributed along the southern foot of the Himalaya Mountains and the western and southern interface of the yunnan *** main reproductive process for Carlemannia tetra- gona was verified as self-pollination by the pollination experiments in this *** rates for seeds of both *** and Silvianthus bracteatus could reach 100% when the seeds were col- lected after two months,while the rates decreased to 25% when collection took place in the previous *** was found that the seed had no dormancy stages,and their seed banks were of the Transient Soil *** field observations,the dehiscence status for fruits showed that their seeds could not be ejected effectively by capsules for *** analyzing the temperature and rainfall data from the years 1971 to 2000,it was shown that annual rainfall,the lowest mean monthly temperature in a year, and the extreme lowest temperature In a month had s great effect on the distribution range of Carle- manniaceae,while the mean annual temperature had s lesser *** narrow distribution range of Carlemanniaceae was affected by multiple factors,such as the short pollen dispersal distance and the Transient Soil Seed *** population sizes of Carlemannlaceae were also easily affected by the level of rainfall,not by any single variable.

关键词： Carlemannia Silvianthus distribution region seed dispersal rainfall temperature

A toolbox for genetic manipulation in intestinal Clostridium symbiosum

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Synthetic and Systems Biotechnology 2024年第1期9卷 43-54页

作者： pengjie yang Jinzhong Tian lu zhang Hui zhang Gaohua yang Yimeng Ren Jingyuan Fang yang Gu Weihong Jiang CAS-Key Laboratory of Synthetic Biology CAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai200032China university of Chinese Academy of Sciences Beijing100049China Xianghu Laboratory Hangzhou311231China NHC Key Laboratory of Digestive Diseases Division of Gastroenterology and HepatologyShanghai Institute of Digestive DiseaseRenji HospitalSchool of MedicineShanghai Jiao Tong University145 Middle Shandong RoadShanghai200001China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen518120China The Wallenberg Laboratory Department of Molecular and Clinical MedicineSahlgrenska AcademyUniversity of GothenburgBruna Straket 16Gothenburg41345Sweden

Gut microbes are closely related with human health,but remain much to *** symbiosum is a conditionally pathogenic human gut bacterium and regarded as a potential biomarker for early diagnosis of intestinal ***,the absence of an efficient toolbox that allows diverse genetic manipulations of this bacterium limits its in-depth ***,we obtained the complete genome sequence of *** ATCC 14940,a representative strain of *** this basis,we further developed a series of genetic manipulation methods for this ***,following the identification of a functional replicon pBP1 in *** ATCC 14940,a highly efficient conjugative DNA transfer method was established,enabling the rapid introduction of exogenous plasmids into ***,we constructed a dual-plasmid CRISPR/Cas12a system for genome editing in this bacterium,reaching over 60% repression for most of the chosen genes as well as efficient deletion(>90%)of three target ***,this toolbox was used for the identification of crucial functional genes,involving growth,synthesis of important metabolites,and virulence of *** ATCC *** work has effectively established and optimized genome editing methods in intestinal ***,thereby providing strong support for further basic and application research in this bacterium.

关键词： Gut Clostridium symbiosum Toolbox Gene overexpression Gene deletion Gene regulation

Plastid phylogenomics provides new insights into the systematics,diversification,and biogeography of Cymbidium(Orchidaceae)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diversity 2024年第4期46卷 448-461页

作者： Hai-Yao Chen Zhi-Rong zhang Xin Yao Ji-Dong Ya Xiao-hua Jin Lin Wang lu lu De-Zhu Li Jun-Bo yang Wen-Bin Yu Center for Integrative Conservation&yunnan Key Laboratory for the Conservation of Tropical Rainforests and Asian Elephants Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan 666303China university of Chinese Academy of Sciences Huairou DistrictBeijing 101408China Plant Germplasm and Genomics Center Germplasm Bank of Wild SpeciesKunming Institute of BotanyChinese Academy of SciencesKunmingYunnan 650201China State Key Laboratory of Plant Diversity and Specility Crops Institute of BotanyChinese Academy of SciencesHaidian DistrictBeijing 100093China School of Pharmaceutical Sciences Yunnan Key Laboratory of Pharmacology for Natural Productsand Yunnan College of Modern Biomedical IndustryKunming Medical UniversityKunmingYunnan 650500China Southeast Asia Biodiversity Research institute Chinese Academy of SciencesYezinNay Pyi Taw 05282Myanmar

Cymbidium(Orchidaceae:Epidendroideae),with around 60 species,is widely-distributed across Southeast Asia,providing a nice system for studying the processes that underlie patterns of biodiversity in the ***,phylogenetic relationships of Cymbidium have not been well resolved,hampering investigations of species diversification and the biogeographical history of this *** this study,we construct a plastome phylogeny of 56 Cymbidium species,with four well-resolved major clades,which provides a framework for biogeographical and diversification rate *** dating and biogeographical analyses show that Cymbidium likely originated in the region spanning northern IndoBurma to the eastern Himalayas during the early Miocene(~21.10 Ma).It then rapidly diversified into four major clades in East Asia within approximately a million years during the middle *** *** to the adjacent regions(Borneo,Philippines,and Sulawesi)primarily occurred during the Pliocene-Pleistocene *** analyses indicate that the net diversification rate of Cymbidium has decreased since its origin,and is positively associated with changes in temperature and monsoon *** hydrothermal conditions brought by monsoon intensification in the early Miocene possibly contributed to the initial rapid diversification,after which the net diversification rate was reduced with the cooling climate after the middle *** transition from epiphytic to terrestrial habits may have enabled adaptation to cooler environments and colonization of northern niches,yet without a significant effect on diversification *** study provides new insights into how monsoon activity and temperature changes affected the diversification dynamics of plants in Southeast Asia.

关键词： Cymbidium East Asia Asian monsoons Climate change Biogeographical patterns

Spin Evolution of the Magnetar SGR J1935+2154

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第1期24卷 201-211页

作者： Ming-Yu Ge Yuan-Pei yang Fang-Jun lu Shi-Qi Zhou Long Ji Shuang-Nan zhang Bing zhang Liang zhang Pei Wang Kejia Lee Weiwei Zhu Jian Li Xian hou Qiao-Chu Li Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China South-Western institute For Astronomy Research Yunnan UniversityKunming 650504China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China Key Laboratory of Stellar and Interstellar Physics and School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China School of Physics and Astronomy Sun Yat-Sen UniversityZhuhai 519082China university of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Nevada Center for Astrophysics University of NevadaLas VegasNV 89154USA Department of Physics and Astronomy University of NevadaLas VegasNV 89154USA National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Department of Astronomy Peking UniversityBeijing 100871China CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China yunnan Observatories Chinese Academy of SciencesKunming 650216China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key laboratory of Modern Astronomy and Astrophysics Nanjing UniversityNanjing 210023China

Fast radio bursts(FRBs)are short pulses observed in radio frequencies usually originating from cosmological *** discovery of FRB 200428 and its X-ray counterpart from the Galactic magnetar SGR J1935+2154suggests that at least some FRBs can be generated by ***,the majority of X-ray bursts from magnetars are not associated with radio *** fact that only in rare cases can an FRB be generated raises the question regarding the special triggering mechanism of *** we report long time spin evolution of SGR J1935+2154 until the end of *** to v and v,the spin evolution of SGR J1935+2154 could be divided into two *** first stage evolves relatively steady evolution until 2020 April *** the burst activity in2020,the spin of SGR J1935+2154 shows strong variations,especially for *** the burst activity in 2022October,a new spin-down glitch with△v/v=(-7.2±0.6)×10^(-6)is detected around MJD 59876,which is the second event in SGR J1935+*** the end,spin frequency and pulse profile do not show variations around the time of FRB 200428 and radio bursts 221014 and 221021,which supply strong clues to constrain the trigger mechanism of FRBs or radio bursts.

关键词： (stars:)pulsars:general (stars:)pulsars:individual(SGR J1935+2154) X-rays:bursts