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Spatial Characteristics and Change for Tree Species (Genera) Along Northeast China Transect (NECT) 被引量:4
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作者 陈雄文 张新时 +1 位作者 周广胜 陈锦正 《Acta Botanica Sinica》 CSCD 2000年第10期1075-1081,共7页
The 16 tree species on Northeast China Transect (NECT) were analyzed from the change of geographical distribution, frequency and dominance pattern and the spatial correlation at landscape scale in 1986 and 1994. Pin... The 16 tree species on Northeast China Transect (NECT) were analyzed from the change of geographical distribution, frequency and dominance pattern and the spatial correlation at landscape scale in 1986 and 1994. Pinus koraiensis Sieb. et Zucc. and Fraxinus rhynchophylla Hemsl. had spread rapidly towards west and east, respectively. The frontier form of species had close relation with its movement. The patch size of Pinus koraiensis , Populus davidiana Dode., Phellodendron amurense Rupr., Juglans mandshurica Maxim., Fraxinus mandshurica Rupr., Betula dahurica Pall., Picea koraiensis Nakai, Abies nephrolepis Maxim. and Larix olgeusis var. koreana Nakai decreased, however, Quercus mongolica Fisch., Betula costata Trautv., Acer mono Maxim., Tilia spp., Ulmus spp., Betula platyphylla Suk. and Fraxinus rhynchophylla increased. The frequency pattern of Populus davidiana , Betula platyphylla , Fraxinus rhynchophylla and Betula dahurica changed significantly. The dominance pattern of Populus davidiana , Tilia spp., Juglans mandshurica , Betula platyphylla , Betula dahurica and Abies nephrolepis changed significantly. The spatial correlation between Quercus mongolica and Betula dahurica , Betula costata and Picea spp., Betula costata and Abies nephrolepis , Picea spp. and Abies nephrolepis declined, however, the spatial correlation between Larix spp. and Betula platyphylla , Acer mono and Ulmus spp. increased. 展开更多
关键词 spatial characteristic tree species(genera) Northeast China Transect PATCH frequency DOMINANCE spatial correlation
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Singchia and Gunnaria,two new genera of Orchidaceae 被引量:3
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作者 Zhong-Jian LIU Li-Jun CHEN 《Journal of Systematics and Evolution》 SCIE CSCD 北大核心 2009年第6期599-604,共6页
Singchia Z. J. Liu & L. J. Chen, a new orchid genus, is established based on the new species S. malipoensis Z. J. Liu & L. J. Chen found in southeast Yunnan, China. The new genus is related to Pteroceras, from which... Singchia Z. J. Liu & L. J. Chen, a new orchid genus, is established based on the new species S. malipoensis Z. J. Liu & L. J. Chen found in southeast Yunnan, China. The new genus is related to Pteroceras, from which it differs by having a lip with its basal margins immovably adnate to the lower part of the pendent column foot, a thin-walled spur, and very unequally and deeply split pollinia, each with a distinct caudicle. In addition to a discussion on Ascocentrum pusillum, a species of questionable placement, another new genus, namely Gunnaria S. C. Chen ex Z. J. Liu & L. J. Chen, is set up and a new combination, namely G. pusilla (Aver.) Z. J. Liu & L. J. Chen, is made. The new genus Gunnaria differs from its allyAscocentrum by having a cross-shaped pollinarium, sulcate or split pollinia, each with a distinct caudicle attached to a common linear stipe much longer than either pollinia or viscidium, and strongly incurved side lobes of the lip. 展开更多
关键词 China G. pusilla (Aver.) Z. J. Liu L. J. Chen Gunnaria S. C. Chen ex Z. J. Liu L. J. Chen new combination new genera new species S. malipoensis Z. J. Liu L. J. Chen Singchia Z. J. Liu L. J. Chen Yunnan.
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Projections from the Prefrontal Cortex to Zona Incerta Mediate Fear Generalization 被引量:1
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作者 Kun Tong Guang-Kai Bu +8 位作者 Si-Qi Jing Tong Wu Yu-Tong Song Yue You Le Liu Yuan-Hao Chen Jing-Ru Hao Nan Sun Can Gao 《Neuroscience Bulletin》 SCIE CAS CSCD 2023年第7期1151-1156,共6页
Dear Editor,Depending on the perceived threat in the environment,organisms can express a broad spectrum of behaviors,ranging from exploration to defensive behaviors[1,2],such as fear response and avoidance.Generalizat... Dear Editor,Depending on the perceived threat in the environment,organisms can express a broad spectrum of behaviors,ranging from exploration to defensive behaviors[1,2],such as fear response and avoidance.Generalization of fear memory can generate anxiety-related disorders that afflict 10%-30%of individuals worldwide,especially during the epidemic situation[3,4]. 展开更多
关键词 CORTEX SPECTRUM genera
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Corrigendum to“V.Phylo Maker2:An updated and enlarged R package that can generate very large phylogenies for vascular plants”[PlantDivers.44(2022)335-339]
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《Plant Diversity》 SCIE CAS CSCD 2023年第1期122-122,共1页
The authors regret the omission of supplementary fi les in the original artide.Download all supplementary fles included with this artide.The author would like to apologise for any inconvenience caused.
关键词 Plant genera COR
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STABILIZATION EFFECT OF MULTI-MACHINE POWER SYSTEM BY USING ADJUSTA BLE SPEED GENERATOR
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作者 左敦定 桧山隆 +1 位作者 秋根孝宽 T.H.Ortmeyer 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2003年第1期53-59,共7页
This paper describes a stabilization effect after installating an adjustable speed generator (ASG) in a multi machine power system. A personal computer based ASG module has been de veloped for the simulations in... This paper describes a stabilization effect after installating an adjustable speed generator (ASG) in a multi machine power system. A personal computer based ASG module has been de veloped for the simulations in parallel with the analog power system simulator i n the Research Laboratory of the Kyushu Electric Power Co. The three phase ins t antaneous value based ASG model has been developed in the Matlab/Simulink envir onment for its detailed and real time simulations, which have been performed on a digital signal processor (DSP) board with AD and DA conversion interfaces inst alled in a personal computer (PC). Simulational results indicate the hig hly improved overall stability of the multi machine power system after installa ting the ASG. 展开更多
关键词 adjustable speed genera tor STABILIZATION analog power system simulator PC based ASG module fuzzy lo gic control
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Description of New Family and Genera of Charophyta
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《地球科学》 EI CAS 1983年第S1期182-185,共4页
Type genus:Aclistochara Peck,1937 emend.Peck,1957 Diagnosis:Gyrogonites composed of five sinistral spiral cells,apicalpart truncated or contracted forming a short neck,summits flat.Spiralcells become distinctly thinne... Type genus:Aclistochara Peck,1937 emend.Peck,1957 Diagnosis:Gyrogonites composed of five sinistral spiral cells,apicalpart truncated or contracted forming a short neck,summits flat.Spiralcells become distinctly thinner and narrower in the apical periphery,formingapical peripheral depression of various depths.The apical centre is eithermarked by an apical rosette formed by inflation of spital ends,orl thin andflat when the spiral ends are not inflated,without apical orifice and utricle. 展开更多
关键词 Description of New Family and genera of Charophyta
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Sihui Furniture Genera Factory
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《China's Foreign Trade》 1996年第5期42-42,共1页
The Sihui Furniture General Factory issituated in the Sihui County Town ofGuangdong Province.It is a state-runenterprise with fixed assets of RMB 15 millionand 400 staff and workers. "Quality first and customers ... The Sihui Furniture General Factory issituated in the Sihui County Town ofGuangdong Province.It is a state-runenterprise with fixed assets of RMB 15 millionand 400 staff and workers. "Quality first and customers supreme"and"abiding by contracts and honouringpromises"are the factory’s aims.The factoryhas built up a reputation for its completequality inspection system,rigid quality controlprocess and warm after-sales service.Thefactory has been awarded the title ofGuangdong Provincial Advanced Enterprise. The Jiahui brand high-spring mattressis the factory’s major product.There are 210springs per square metre of the mattress.Each spring is heat-treated through 展开更多
关键词 Sihui Furniture genera Factory HIGH
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Metagenomic and metatranscriptomic analyses of microbial genera and volatiles produced during the fermentation of doubanjiang meju
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作者 Liang Zhang Yan Zeng +2 位作者 Jin Yu Yufeng Li Peibin Zeng 《Food Bioscience》 2024年第6期2050-2060,共11页
Fermented broad beans(Vicia faba L.),commonly known as meju,serve as a crucial raw material for producing Pixian Doubanjiang(DBJ),a traditional condiment in Chinese cuisine.However,there is limited information on the ... Fermented broad beans(Vicia faba L.),commonly known as meju,serve as a crucial raw material for producing Pixian Doubanjiang(DBJ),a traditional condiment in Chinese cuisine.However,there is limited information on the dynamics of fungal populations and the activity shifts of key enzymes during DBJ meju fermentation.This study aimed to elucidate the microbial composition,active genera,expressed genes and pathways during the DBJ meju fermentation.The general chemical components,free amino acids,enzymes and volatile compounds were also investigated;the correlations between active genera and physicochemical factors were analyzed,at different fermentation stages.The results demonstrated that protease was the predominant enzyme during meju fermentation.A total of 32 major volatile compounds were identified,with most alcohols and aldehydes showing a sharp increase from the early to the middle stages,followed by stabilization until the end of fermentation.Significant shifts in metatranscriptomic composition at the genus level were observed,with Aspergillus,Staphylococcus,and Tulasnella emerging as the core active genera in the process.Notably,cellulase activity was positively correlated with the presence of Tulasnella.Additionally,Aspergillus and Tulasnella were found to play a crucial role in developing the unique aroma of DBJ meju.Our findings on the succession of active genera and their correlation with physicochemical factors are expected to provide substantial evidence for potential quality control and enhancement of this renowned Chinese condiment. 展开更多
关键词 Doubanjiang meju Metatranscriptome Active genera Tulasnella
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Fungal diversity notes 1818-1918:taxonomic and phylogenetic contributions on genera and species of fungi 被引量:6
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作者 Ishara S.Manawasinghe Kevin D.Hyde +152 位作者 Dhanushka N.Wanasinghe Samantha C.Karunarathna Sajeewa S.N.Maharachchikumbura Milan C.Samarakoon Hermann Voglmayr Ka-Lai Pang Michael Wai-Lun Chiang E.B.Gareth Jones Ramesh K.Saxena Arun Kumar Kunhiraman C.Rajeshkumar Laura Selbmann Claudia Coleine Yuwei Hu A.Martyn Ainsworth Kare Liimatainen Tuula Niskanen Anna Ralaiveloarisoa Elangovan Arumugam Kezhocuyi Kezo Malarvizhi Kaliyaperumal Sugantha Gunaseelan Asha J.Dissanayake Abdul Nasir Khalid Achala Jeevani Gajanayake Adam Flakus Alireza Armand AndréAptroot Andre Rodrigues Andrei Tsurykau Ángela López-Villalba Antonio Roberto Gomes de Farias Antonio Sánchez Aristóteles Góes-Neto Bruno T.Goto Carlos A.F.de Souza Charuwan Chuaseeharonnachai Chuan-Gen Lin Cuijinyi Li Cvetomir M.Denchev Daniel Guerra-Mateo Danushka S.Tennakoon De-Ping Wei Dominik Begerow Eduardo Alves Elisandro Ricardo Drechsler-Santos Enayra Silva Sousa Erika Valente de Medeiros Ewald Langer Fa Zhang Francisco A.de Souza Franco Magurno Gabriel G.Barreto Gabriel Moreno Gajanan Mane Genivaldo Alves-Silva Gladstone Alves da Silva Guiyang Xia Hong-Wei Shen Heng Gui Indunil C.Senanayake Janet Jennifer Luangsa-ard Jia-Wei Liu Jian-Kui Liu Jian Ma Jie-Ying Lin JoséEvando Aguiar Beserra Jr Jose F.Cano-Lira Josepa Gené Kuniyil Harikrishnan Li Lu Lidiane A.dos Santos Lijian Xu Lorena T.Lacerda Luís F.P.Gusmão Marcela E.S.Cáceres Marcos Paz Saraiva Câmara Maria B.B.de Barros-Barreto Mark S.Calabon Martin Kukwa Martin Kemler Maruzanete Pereira de Melo Masoomeh Ghobad-Nejhad Mei Luo Mengmeng Ding Mingkwan Doilom Monthien Phonemany Muhammad Usman Naritsada Thongklang Nattawut Boonyuen Nikhil Ashtekar Nuwan D.Kularathnage Onden P.Sruthi Papichaya Kwantong Parayelil A.Ansil Pepijn W.Kooij Qi Zhao Rafael Ferreira Alfenas Rafael J.V.de Oliveira Raghvendra Singh Rejane Maria Ferreira da Silva Rameshwar Avchar Rashmi Morey Rohit Sharma Rong-Ju Xu Rosa Mara B.da Silveira Rui-Fang Xu Ruvishika S.Jayawardena Salna Nanu Salilaporn Nuankaew Saowaluck Tibpromma Saranyapath Boonmie Sayanh Somrithipol Sherin Varghese Silvino Intra Moreira Soumyadeep Rajwar Shu-Cheng He T.K.Arun Kumar Teodor T.Denchev Thatsanee Luangharn Thays Gabrielle Lins de Oliveira Tian-Ye Du Ting-Chi Wen Tingting Du Tong Wu Veera Sri-Indrasutdhi Vinson P.Doyle Vladimir Baulin Wei Dong Wen-Li Li Wen-Hua Lu Wenhui Tian Willie Anderson dos Vieira Wolfgang von Brackel Xian-Dong Yu Xian Zhang Xiang-Fu Liu Xing-Can Peng Yanpeng Chen Yanyan Yang Ying Gao YinRu Xiong Yongxin Shu Yong-Zhong Lu Yuan-Min Shen Yueyan Zhou Yun Xia Zhang Wei Zhang Zong-Long Luo Manawaduge Ayesha Madushani Ratchadawan Cheewangkoon Jia Ge Song Biao Xu 《Fungal Diversity》 2025年第1期1-261,共261页
This article is the 17th in the Fungal Diversity Notes series which allows the researchers to publish fungal collections with updated reports of fungus-host and fungus-geography.Herein we report 97 taxa with four new ... This article is the 17th in the Fungal Diversity Notes series which allows the researchers to publish fungal collections with updated reports of fungus-host and fungus-geography.Herein we report 97 taxa with four new genera distributed in three phyla(Ascomycota,Glomeromycota and Mucoromycota),11 classes,38 orders and 62 families collected from various regions worldwide.This collection is further classified into taxa from 69 genera with four novel genera namely Jinshana,Lithophyllospora,Parapolyplosphaeria and Stegonsporiicola.Furthermore,71 new species,21 new records,one new combination and four novel phylogenetic placements are provided.The new species comprise Acrocalymma estuarinum,Aggregatorygma isidiatum,Alleppeysporonites elsikii,Amphibambusa aquatica,Apiospora hongheensis,Arthrobotrys tachengensis,Calonectria potisiana,Collariella hongheensis,Colletotrichum squamosae,Corynespora chengduensis,Diaporthe beijingensis,Dicellaesporites plicatus,Dicellaesporites verrucatus,Dictyoarthrinium endophyticum,Distoseptispora chiangraiensis,Dothiora eucalypti,Epicoccum indicum,Exesisporites chandrae,Fitzroyomyces pseudopandanicola,Fomitiporia exigua,Fomitiporia rondonii,Fulvifomes subthailandicus,Gigaspora siqueirae,Gymnopus ailaoensis,Hyalorbilia yunnanensis,Hygrocybe minimiholatra,H.mitsinjoensis,H.parviholatra,H.solis,H.vintsy,Helicogermslita kunmingensis,Jinshana tangtangiae,Kirschsteiniothelia dujuanhuensis,Lamproderma subcristatum,Leucoagaricus madagascarensis,Leucocoprinus mantadiaensis,Lithophyllospora australis,Marasmius qujingensis,Melomastia aquilariae,Monoporisporites jansoniusii,M.pattersonii,Monoporisporites valdiyae,Mucispora maesotensis,Mucor soli,Muyocopron yunnanensis,Nigrospora tomentosae,Ocellularia psorirregularis,Ophiocordyceps duyunensis,Oxneriaria nigrodisca,Oxydothis aquatica,O.filiforme,Phacidiella xishuangbannaensis,Phlebiopsis subgriseofuscescens,Pleurothecium takense,Pleurotus tuber-regium,Pseudochaetosphaeronema puerensis,Pseudodactylaria guttulate,Racheliella chinensis,Rhexoacrodictys fangensis,Roussoella neoaquatica,Rubroboletus pruinosus,Sanghuangporus subzonatus,Scytalidium assmuthi,Shrungabeeja kudremukhensis,Spirographa skorinae,Stanjehughesia bambusicola,Stegonsporiicola aurantiaca,Umbelopsis hingganensis,Vararia tenuata,Verruconis pakchongensis,Wongia bandungensis,and Zygosporium cymodoceae.The new combination is Parapolyplosphaeria thailandica(≡Polyplosphaeria thailandica).The 21 new hosts,geographical and habitat records comprise Acrocalymma fici,Apiculospora spartii,Aspergillus subramanianii,Camposporium ramosum,Clonostachys rogersoniana,Colletotrichum brevisporum,C.plurivorum,Collybiopsis gibbosa,Dictyosporium tratense,Distoseptispora adscendens,Exosporium livistonae,Ganoderma gibbosum,Graphis mikuraensis,Gymnosporangium paraphysatum,Lasiodiplodia thailandica,Moesziomyces bullatus,Penicillium cremeogriseum,P.echinulonalgiovense,P.javanicum,P.lanosocoeruleum,P.polonicum,and Pleurotus tuber-regium.Graphis chlorotica,G.panhalensis and G.parilis are given as novel phylogenetic placements.In addition,we provide the morphology of Tarzetta tibetensis which was missing in the previous Fungal Diversity Notes 1611–1716.Identification of characterization of all these taxa are supported by morphological and multigene phylogenetic analyses. 展开更多
关键词 71 new species 21 new records 4 new genera ASCOMYCOTA Basidiomycota DOTHIDEOMYCETES Fossil fungi LECANOROMYCETES Leotiomycetes GLOMEROMYCOTA SORDARIOMYCETES
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One stop shop V:taxonomic update with molecular phylogeny for important phytopathogenic genera:101-125(2024) 被引量:2
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作者 Ruvishika S.Jayawardena Kevin D.Hyde +37 位作者 Herbert D.R.Aumentado Pranami D.Abeywickarama Shubhi Avasthi Asha J.Dissanayake Ajay K.Gautam Achala J.Gajanayake Alireza Armand Mark A.O.Balendres Mark S.Calabon Yi Jyun Chen K.W.Thilini Chethana Himashi S.Ferdinandez Deecksha Gomdola P.A.Jose Tadeusz Kowalski Nuwan D.Kularathnage S.Kumar YanRu Lan Thatsanee Luangharn Ishara S.Manawasinghe S.Praveena Binu Samarakoon Elaheh Seifollahi Indunil C.Senanayake Milan Špetík Hongde Yang Guiyan Xia Yueyan Zhou Shucheng He Putarak Chomnunti Prapassorn D.Eungwanichayapant Jian‑Kui Liu Sajeewa S.N.Maharachchikumbura Dimuthu S.Manamgoda Alan J.L.Phillips YunXia Zhang Fuqiang Yu Yong Wang 《Fungal Diversity》 2025年第1期263-429,共167页
This paper represents the fifth One Stop Shop(OSS)series contribution.This series provides background,disease symptoms,pathogen biology and epidemiology(when available)distribution,hosts for the treated genera,and imp... This paper represents the fifth One Stop Shop(OSS)series contribution.This series provides background,disease symptoms,pathogen biology and epidemiology(when available)distribution,hosts for the treated genera,and important gene regions for a better resolution.Species that have pathogenic data are also provided under each genus.This fifth OSS paper treats 25 genera of phytopathogenic fungi:Allophoma,Alternaria,Bipolaris,Boeremia,Calonectria,Calophoma,Campylocarpon,Clonastachys,Corynespora,Cryphonectria,Diaporthe,Diplocarpon,Epicoccum,Eutiarosporella,Ganoderma,Hypomyces,Lasiodiplodia,Monilinia,Neocordana,Phragmidium,Pileolaria,Pseudocercospora,Rhynchosporium,Scytalidium and Sphaeropsis. 展开更多
关键词 25 genera Didymellaceae Distribution HOSTS PATHOGENICITY
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陕南地区光伏遮阳板的应用研究
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作者 杨红霞 姜瑶 +1 位作者 何春燕 宋倩 《延安大学学报(自然科学版)》 2026年第1期44-50,共7页
光伏遮阳板因为具遮阳节能与绿色发电双重功能,已成为建筑光伏一体化(BIPV)的关键技术。为研究光伏遮阳系统在陕南地区的应用,本研究根据陕南气象资料,应用EnergyPlus和Grasshoper+Ladybug Tools软件,模拟了光伏遮阳板在不同悬伸宽度、... 光伏遮阳板因为具遮阳节能与绿色发电双重功能,已成为建筑光伏一体化(BIPV)的关键技术。为研究光伏遮阳系统在陕南地区的应用,本研究根据陕南气象资料,应用EnergyPlus和Grasshoper+Ladybug Tools软件,模拟了光伏遮阳板在不同悬伸宽度、安装倾角下的发电量、建筑室内光环境情况。结果表明,在陕南地区安装光伏遮阳板能提高建筑的节能率,光伏遮阳板发电量随着安装的倾斜角度增大而增大,而室内采光强度与之相反,且光伏遮阳板悬伸宽度为1.5 m时发电量与照明能耗自满足率达到最大,安装倾斜角度为30°时室内全年采光强度均达到要求。悬伸宽度1.5 m、倾斜角度30°为最佳安装方式。本研究为陕南地区办公建筑迈向“近零能耗”提供参考,也为光伏遮阳系统推广使用提供支持。 展开更多
关键词 陕南地区 建筑光伏一体化 光伏遮阳 发电量 建筑能耗 室内采光
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Least speciose among the most speciose:Natural history correlates of monospecific and bispecific genera of Rodentia and Soricomorpha
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作者 Giovanni AMORI Alessandra Maria BISSATTINI +3 位作者 Spartaco GIPPOLITI Leonardo VIGNOLI Luigi MAIORANO Luca LUISELLI 《Integrative Zoology》 SCIE CSCD 2017年第6期489-499,共11页
Monospecific and bispecific genera are of special concern as they represent unique phylogenetic/evolutionary trajectories within larger clades.In addition,as phylogenetically older taxa are supposed to be exposed to h... Monospecific and bispecific genera are of special concern as they represent unique phylogenetic/evolutionary trajectories within larger clades.In addition,as phylogenetically older taxa are supposed to be exposed to high­er rarity and extinction risk,monospecific and bispecific genera may be intrinsically more prone to extinction risks than multispecies genera,although extinction risks also depend on the ecological and biological strategy of the species.Here,the distribution across biogeographical zones and the levels of threat to 2 speciose orders of mammals(monospecific and bispecific genera of Rodentia and Soricomorpha)are investigated in order to high­light major patterns at the worldwide scale.In Rodentia,39.7%of the genera(n=490)were monospecific and 17.9%were bispecific.In Soricomorpha,44.4%of the total genera(n=45)were monospecific and 15%were bispecific.There was a positive correlation between the number of monospecific genera and the total number of genera per family.Peaks of monospecific and bispecific genera richness were observed in Neotropical,Oriental and Afrotropical regions in rodents and in the Palearctic region in soricomorphs.Range size was significantly uneven across biogeographic region in rodents(with larger ranges in Nearctic and Oriental regions and smaller ranges in the Australian region),but there was no difference across biogeographic regions in terms of range size in soricomorphs.Most of the monospecific and bispecific genera occurred in forest habitat in both taxa.The fre­quency distribution of the monospecific and bispecific genera across IUCN categories did not differ significant­ly from the expected pattern using the total rodent genera and the multispecies genera. 展开更多
关键词 bispecific genera conservation monospecific genera RODENTIA SORICOMORPHA
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狼尾草属牧草品种资源概述
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作者 钟绍丽 胡廷花 +8 位作者 薛世明 刘昀 杨善海 陈涛 傅先海 师正鹏 刘彦培 匡崇义 张美艳 《草学》 2026年第1期50-59,共10页
狼尾草属牧草具有适应性强、高产质优等特点,为我国草牧业、生态保护的重要资源,但存在品种名称混乱、辨种困难等问题。本文梳理了我国23个品种及野生种的特性,结果表明:狼尾草属植物品种多样性显著:美洲狼尾草粮饲兼用、耐盐碱;东非狼... 狼尾草属牧草具有适应性强、高产质优等特点,为我国草牧业、生态保护的重要资源,但存在品种名称混乱、辨种困难等问题。本文梳理了我国23个品种及野生种的特性,结果表明:狼尾草属植物品种多样性显著:美洲狼尾草粮饲兼用、耐盐碱;东非狼尾草耐践踏、适宜放牧;杂交狼尾草高产且生态功能突出;西藏狼尾草适应高海拔贫瘠环境。用途广泛:既是优质饲料,又具备生态修复功能。区域特征明显:热带地区宜选高产型象草和杂交狼尾草;温带地区适用耐寒型东非狼尾草和白草;高海拔地区可栽培乾宁狼尾草。综上所述,引种栽培狼尾草属牧草应结合区域气候与利用目的,选择适宜品种,未来需加强分子鉴定、种质创新、多元化利用、种子繁殖等研究,进一步推动狼尾草属资源高效开发与可持续发展。 展开更多
关键词 狼尾草属牧草 野生变异种 高产优质 适应性强
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ON THE GENERALIZED RAMANUJAN-NAGELL EQUATION (Ⅰ) 被引量:2
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作者 乐茂华 《Chinese Science Bulletin》 SCIE EI CAS 1984年第2期278-279,共2页
Let D be a nonsquare integer and p be an odd prime with p(?)D. The equation x^2-D=p^n, x>0, n>0 (1) is usually called the generalized Ramanujan-Nagell equation. For this equation, there are many related works wr... Let D be a nonsquare integer and p be an odd prime with p(?)D. The equation x^2-D=p^n, x>0, n>0 (1) is usually called the generalized Ramanujan-Nagell equation. For this equation, there are many related works written by Alter and Kubota, Brown, Cohen and lnkeri. In this letter, we shall prove the 展开更多
关键词 INTEGER LETTER genera 气脚 LEDGE 林琳 mentioned
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Hirzebruch X_y genera of the Hilbert schemes of surfaces by localization formula 被引量:1
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作者 刘克锋 Catherine YAN 周坚 《Science China Mathematics》 SCIE 2002年第4期420-431,共12页
We use the Atiyah-Bott-Segal-Singer Lefschetz fixed point fornula to calculate the Hirzebruch Xy genus Xy(S[n]), where S[n] is the Hilbert scheme of points of length n of a surface 5. Combinatorial interpretation of t... We use the Atiyah-Bott-Segal-Singer Lefschetz fixed point fornula to calculate the Hirzebruch Xy genus Xy(S[n]), where S[n] is the Hilbert scheme of points of length n of a surface 5. Combinatorial interpretation of the weights of the fixed points of the natural torus action on (C2)[n] is used. This is the first step to prove a conjectural formula about the elliptic genus of the Hilbert schemes. 展开更多
关键词 genera HILBERT schemes LOCALIZATION formula.
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GENERALIZED ISOCHRONS, MIX-ISOCHRONS AND THEIR IMPLICATION
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作者 覃振蔚 《Chinese Science Bulletin》 SCIE EI CAS 1986年第1期70-71,共2页
In isotopic chronology, homogenization of the initial values has ever been a primary prerequisite for isochrons. However, theoretical consideration shows that isochrons can always be obtained if a closed system satisf... In isotopic chronology, homogenization of the initial values has ever been a primary prerequisite for isochrons. However, theoretical consideration shows that isochrons can always be obtained if a closed system satisfies the linear equation at its initial instant, i. e., 展开更多
关键词 homogenization isotopic INSTANT PREREQUISITE mixing abnormal DAUGHTER genera versus MAYBE
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DETECTION OF FREE RADICALS GENERATED FROM GUINEA-PIG HEARTS DURING ANOXIA AND REOXYGENATION BY SPIN TRAPPING ELECTRON SPIN RESONANCE (ESR) TECHNIQUE
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作者 郝建明 句海松 +5 位作者 陈尚恭 邹存梅 陆道慧 陈德文 张永康 徐广智 《Chinese Science Bulletin》 SCIE EI CAS 1991年第18期1582-1583,共2页
More and more attention has been focused on ischemic-reperfusion injury of myocardium. The important role of free radicals (FRs) has been hypothesized in mediating the injury. To investigate the production and mechani... More and more attention has been focused on ischemic-reperfusion injury of myocardium. The important role of free radicals (FRs) has been hypothesized in mediating the injury. To investigate the production and mechanism of FRs generated from myocardium during ischemia and reperfusion, the spin trapping ESR technique was applied to 展开更多
关键词 MYOCARDIUM SPIN trapping detecting isola GUINEA genera Paradox Fenton hearts
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AFL WITH GENERALIZED SEMILINEAR PROPERTY
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作者 冯克勤 《Chinese Science Bulletin》 SCIE EI CAS 1985年第1期10-13,共4页
Ⅰ. INTRODUCTION AND STATEMENT OF RESULTS Let V={v0,…,vn,} be an alphabet. For each word P∈ V,Nvi(P) denotes the number of occurrences of letter vi in P. In 1966, Parikh introduced the
关键词 LETTER SEMILINEAR Slip implies intro DISJOINT SUBSET STRING morethan genera
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Torus actions, fixed-point formulas, elliptic genera and positive curvature
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作者 Anand DESSAI 《Frontiers of Mathematics in China》 SCIE CSCD 2016年第5期1151-1187,共37页
We study fixed points of smooth torus actions on closed manifolds using fixed point formulas and equivariant elliptic genera. We also give applications to positively curved Riemannian manifolds with symmetry.
关键词 Torus actions fixed point formulas equivariant indices elliptic genera rigidity and vanishing
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