期刊文献+
共找到320篇文章
< 1 2 16 >
每页显示 20 50 100
Distribution of Species of the Genus Astragalus L. in Kyrgyzstan by Habitat Type
1
作者 Orozbay Mamatkulov Orunbek Kolanov +1 位作者 Kursantbek Attokurov Zhanan Erkebaeva 《Research in Ecology》 2025年第3期212-223,共12页
According to literary data,there are 189 species of the genus Astragalus that inhabit the territory of Kyrgyzstan.The distribution of species of the genus Astragalus(Fabaceae)was studied by taking into account their o... According to literary data,there are 189 species of the genus Astragalus that inhabit the territory of Kyrgyzstan.The distribution of species of the genus Astragalus(Fabaceae)was studied by taking into account their occurrence in soil-climatic and relief types of plant habitats in the mountainous territories of Kyrgyzstan.The materials were collected during organized research expeditions to natural areas of plant habitats.The occurrence of species was studied by well-known methods.As a result of such analysis we have made the following conclusions for the first time:in the flora of Kyrgyzstan there are 189 species of the genus Astragalus,they are representatives of 7 subgenera of this genus;species occur in 24 types of plant habitats with soil and relief features,taking into account the altitudinal regularity of taxa distribution in mountain phytocenoses;subgenuses and specific species characterized by broad,smallest and intermediate sizes of habitats were identified;groupings of plant habitat types on the territory of Kyrgyzstan characterized by the largest,smallest and intermediate indicators on the number of subgenuses and species of the genus Astragalus were identified.The botanical description of each species has been supplemented with new information about the species as a taxonomic unit.The materials of our work can be successfully used in the field of systematics,evolution and ecology of plants. 展开更多
关键词 SPECIES genus SUBgenus ASTRAGALUS PHYTOCENOSIS Flora DISTRIBUTION Highlands Geographical Regions
在线阅读 下载PDF
Nowhere-zero 5-fows for graphs with bounded genus
2
作者 LI Jiaao SU Bo 《运筹学学报(中英文)》 北大核心 2025年第3期124-134,共11页
A nowhere-zero k-flow on a graph G=(V(G),E(G))is a pair(D,f),where D is an orientation on E(G)and f:E(G)→{±1,±2,,±(k-1)}is a function such that the total outflow equals to the total inflow at each vert... A nowhere-zero k-flow on a graph G=(V(G),E(G))is a pair(D,f),where D is an orientation on E(G)and f:E(G)→{±1,±2,,±(k-1)}is a function such that the total outflow equals to the total inflow at each vertex.This concept was introduced by Tutte as an extension of face colorings,and Tutte in 1954 conjectured that every bridgeless graph admits a nowhere-zero 5-flow,known as the 5-Flow Conjecture.This conjecture is verified for some graph classes and remains unresolved as of today.In this paper,we show that every bridgeless graph of Euler genus at most 20 admits a nowhere-zero 5-flow,which improves several known results. 展开更多
关键词 5-fow conjecture minimal counterexample graphs with bounded genus
在线阅读 下载PDF
Application of spectroscopic technology with machine learning in Chinese herbs from seeds to medicinal materials:The case of genus Paris
3
作者 Yangna Feng Xinyan Zhu Yuanzhong Wang 《Journal of Pharmaceutical Analysis》 2025年第2期291-303,共13页
To ensure the safety and efficacy of Chinese herbs,it is of great significance to conduct rapid quality detection of Chinese herbs at every link of their supply chain.Spectroscopic technology can reflect the overall c... To ensure the safety and efficacy of Chinese herbs,it is of great significance to conduct rapid quality detection of Chinese herbs at every link of their supply chain.Spectroscopic technology can reflect the overall chemical composition and structural characteristics of Chinese herbs,with the multi-component and multitarget characteristics of Chinese herbs.This review took the genus Paris as an example,and applications of spectroscopic technology with machine learning(ML)in supply chain of the genus Paris from seeds to medicinal materials were introduced.The specific contents included the confirmation of germplasm resources,identification of growth years,cultivar,geographical origin,and original processing and processing methods.The potential application of spectroscopic technology in genus Paris was pointed out,and the prospects of combining spectroscopic technology with blockchain were proposed.The summary and prospects presented in this paper will be beneficial to the quality control of the genus Paris in all links of its supply chain,so as to rationally use the genus Paris resources and ensure the safety and efficacy of medication. 展开更多
关键词 Medicinal herbs genus Paris Spectroscopic technology Quality detection Supply chain Machine learning
暂未订购
The spatial shifts and vulnerability assessment of ecological niches under climate change scenarios at the genus level:A case study of Betula,China
4
作者 Xian-Ge Hu Jiahui Chen +7 位作者 Ying Yang Man Shi Peng Liu Yiheng Lin Jian-Feng Mao Yousry A.El-Kassaby Erpei Lin Huahong Huang 《Forest Ecosystems》 2025年第5期1006-1020,共15页
As global warming persistently alters and rapidly reshapes landscapes and habitats, conventional species distribution models relying solely on maintaining static conditions within the current climate are likely to fal... As global warming persistently alters and rapidly reshapes landscapes and habitats, conventional species distribution models relying solely on maintaining static conditions within the current climate are likely to falter, particularly at the genus level. Hence, we hypothesize that climate change will differentially affect ecological niches of the same genus species with various latitudinal positioning and local topography, and the high-latitude species may experience greater niche contraction than low-latitude species, and that mountainous regions with high elevational variability may serve as critical climate refugia. Herein, we simulate niche alterations and integrate an ensemble model(EM) strategy, taking into account species dispersal limitations factors(topography, soil, and ultraviolet), to construct a comprehensive habitat suitability(CHS) model for assessing the future vulnerability of the Betula genus, most of which are timber species in China. Our findings reveal that the niche spatial(geographic distribution) of most species(62%) within the Betula genus will undergo a gradual decline under climate change, supporting our hypothesis of latitudinal differentiation in climate vulnerability. Intriguingly, the projected high-latitude niche reduction within the genus cannot be counterbalanced by the anticipated niche expansion of closely related species in low-latitude regions, even considering the evident latitudinal gradient distribution of species. Nonetheless, the niche spatial of six Betula species in southwestern China remains stable or expands under warming scenarios, strongly supporting our secondary hypothesis about topographic buffering effects, which probably means the unique topography(i.e., the largest elevation difference) of this region may serve as a sanctuary for preserving Betula genetic diversity. Our results underscore the uncertain nature of pre-existing niche systems at the genus level under climate change, emphasizing the need for diligent resource management and conservation planning for vulnerable timber species. 展开更多
关键词 Climate change Niches spatial Ensemble model(EM) Betula genus
在线阅读 下载PDF
Mitochondrial DNA Sequences Imply Anhui Musk Deer a Valid Species in Genus Moschus 被引量:13
5
作者 宿兵 王应祥 王岐山 《Zoological Research》 CAS CSCD 北大核心 2001年第3期169-173,共5页
Anhui musk deer [ Moschus ( moschiferus/berezovskii ) anhuiensis ] has been a taxonomic mystery since its discovery in early 80's.In this paper,with museum samples,we sequenced the complete cytochrome b ge... Anhui musk deer [ Moschus ( moschiferus/berezovskii ) anhuiensis ] has been a taxonomic mystery since its discovery in early 80's.In this paper,with museum samples,we sequenced the complete cytochrome b gene of five Anhui musk deer.When compared with other species in Genus Moschus ,Anhui musk deer showed a rather level of sequence divergence from all the other species in this genus.The phylogenetic trees constructed by multiple methods supported the same topology,in which the monophyly of Anhui musk deer was clearly demonstrated.Therefore,our molecular data suggest a full species status for Anhui musk deer ( Moschus anhuiensis ),rather than a subspecies of either M moschiferus or M berezovskii previously suggested by morphological studies. 展开更多
关键词 Musk deer genus Moschus Anhui musk deer Cytochrome b gene Molecular phylogeny
在线阅读 下载PDF
A New Genus of Mesoserphidae (Hymenoptera: Proctotrupoidea) from the Upper Jurassic of Northeast China 被引量:5
6
作者 张海春 张俊峰 《Entomotaxonomia》 CSCD 2000年第4期279-282,共4页
The genus Beipiaoserphus gen. nov. is established and referred to Mesoserphidae with Beipiaoserphus elegans sp. nov. as its type species. The type specimens were collected from the lower part of the Upper Jura... The genus Beipiaoserphus gen. nov. is established and referred to Mesoserphidae with Beipiaoserphus elegans sp. nov. as its type species. The type specimens were collected from the lower part of the Upper Jurassic Yixian Formation at Huangbanjigou Village near Shangyuan Town, Beipiao, Liaoning Province, China and are housed at Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing. 展开更多
关键词 HYMENOPTERA Mesoserphidae new genus new species Upper Jurassic Yixian Formation Northeast ChiH
在线阅读 下载PDF
A New Genus—Thelazacallis (Homoptera: Aphidoidea) from China with Description of a New Species 被引量:4
7
作者 乔格侠 张广学 《Entomotaxonomia》 CSCD 2000年第1期27-30,共4页
A new genus, Thelazacallis Zhang (Homoptera: Drepanosiphidae) and a new species, Thelazacallis ranunculicola Qiao et Zhang from China is described with 9 original figures in the present paper. All type specimens a... A new genus, Thelazacallis Zhang (Homoptera: Drepanosiphidae) and a new species, Thelazacallis ranunculicola Qiao et Zhang from China is described with 9 original figures in the present paper. All type specimens are deposited in the Institute of Zoology, Chinese Academy of Sciences. 展开更多
关键词 HOMOPTERA APHIDOIDEA DREPANOSIPHIDAE Thelazacallis new genus new species China
在线阅读 下载PDF
A new genus and two new species of Chrysomelinae(Coleoptera:Chrysomelidae) from China 被引量:1
8
作者 葛斯琴 DACCORDI Mauro +3 位作者 LOPATIN Igor K. 崔俊芝 李文柱 杨星科 《Entomotaxonomia》 CSCD 北大核心 2012年第4期633-640,共8页
A new leaf beetle genus Yulongedon gen. nov., and two new species, Y. formosus sp. nov. and Y. jambhalai sp. nov. from China, are described and illustrated here.
关键词 CHRYSOMELIDAE CHRYSOMELINAE new genus new species China
原文传递
A New Species of Placidellus Evans and A Related New Genus(Homoptera: Cicadellidae) 被引量:1
9
作者 张雅林 魏琮 沈林 《Entomotaxonomia》 CSCD 北大核心 2002年第4期239-244,共6页
In the present paper, a new species, Placidellus conjugatus, sp. nov. is described from Fujian, China and its types are deposited in the Entomological Museum, Northwest SciTech University of Agriculture and Forestry (... In the present paper, a new species, Placidellus conjugatus, sp. nov. is described from Fujian, China and its types are deposited in the Entomological Museum, Northwest SciTech University of Agriculture and Forestry (NSUAF). One related new genus, Paraplacidellus, gen. nov. with a new species Paraplacidellus maculatus, sp. nov. is described from Sandakan, Borneo, and the holotype of the new species is deposited in the National Museum of Natural History (NMNH). 展开更多
关键词 HOMOPTERA CICADELLIDAE Placidellus Paraplacidellus new genus new species
在线阅读 下载PDF
New Tineid Genus and Species (Lepidoptera, Tineidae) from China 被引量:1
10
作者 肖云丽 李后魂 《Entomotaxonomia》 CSCD 北大核心 2008年第1期31-35,共5页
A new genus Unilepidotricha gen. nov. is proposed based on the type species U. gracilicurva sp. nov. collected from Yunnan, China. The photographs of the adult and the genitalia as well as the drawings of the wing ven... A new genus Unilepidotricha gen. nov. is proposed based on the type species U. gracilicurva sp. nov. collected from Yunnan, China. The photographs of the adult and the genitalia as well as the drawings of the wing venation are provided. 展开更多
关键词 LEPIDOPTERA TINEIDAE Unilepidotricha new genus new species China
在线阅读 下载PDF
TAXONOMIC STUDIES ON ARGIDAE OF CHINA I.A NEW GENUS AND TWO NEW SPECIES OF ATHERMANTINAE (HYMENOPTERA) ① 被引量:2
11
作者 魏美才 《Entomotaxonomia》 CSCD 1998年第3期219-222,共4页
Spinarge, gen.nov.with two new species, Spinarge sichuanensis, sp.nov.and S. liui, sp.nov. are described. The new genus is placed in subfamily Athermantinae. A key to the two new species is provided.
关键词 HYMENOPTERA ARGIDAE new genus new species China
在线阅读 下载PDF
A New Genus and a New Species of Grasshoppers from Jiangsu Province (Orthopters:Arcypteridae)
12
作者 印红 张道川 李新江 《Zoological Research》 CAS CSCD 北大核心 2002年第4期319-322,共4页
The paper reports a new genus of Arcypteridae i e. Suacris gen.nov.and a new species Suacris siyangensis sp.nov.The new genus is similar to Omocestus I Bol ,but differs from the latter in:① Lateral car... The paper reports a new genus of Arcypteridae i e. Suacris gen.nov.and a new species Suacris siyangensis sp.nov.The new genus is similar to Omocestus I Bol ,but differs from the latter in:① Lateral carinae slightly curved,widest 1 6-1 8 times greater than narrowest.② Cubital area wider than or equal to medial area.③Tympanum organ distinct,♂ widely oval,♀ crevice like.The new genus is also similar to Stenobothroides Xu et Zheng,but differs from the later in:①Lateral carinae obvious and curve.②Tergum of terminal abdomere without furcula.③Male subgenital plate long conica.Type specimens are deposited in Northwest Plateau Institute of Biology,the Chinese Academy of Sciences. 展开更多
关键词 ORTHOPTERA ARCYPTERIDAE New genus New species China
在线阅读 下载PDF
A New Genus and Two New Species of the Tribe Blaptini in China (Coleoptera:Tenebrionidae)
13
作者 任国栋 李哲 OliverA RYDER 《Zoological Research》 CAS CSCD 北大核心 2001年第4期310-314,共5页
A new genus and two new species from the family Tenebrionidae of the order Coleoptera of China are reported in this paper,namely Neoblaps gen.nov.,N.huizensis sp.nov.,Dila bomiana sp.nov.The type specimens are preserv... A new genus and two new species from the family Tenebrionidae of the order Coleoptera of China are reported in this paper,namely Neoblaps gen.nov.,N.huizensis sp.nov.,Dila bomiana sp.nov.The type specimens are preserved in the Museum of Hebei University. 展开更多
关键词 TENEBRIONIDAE BLAPTINI New genus New species China
在线阅读 下载PDF
A New Genus of Proctotrupinae (Hymenoptera: Proctotrupidae)
14
作者 何俊华 许再福 《Entomotaxonomia》 CSCD 北大核心 2007年第2期152-156,共5页
A new genus of Proctotrupinae is established to receive Carinaserphus sinensis, sp. nov. from Mt. Funiu, Henan Province, China. The new genus is described and compared with related genera. The type specimen is deposit... A new genus of Proctotrupinae is established to receive Carinaserphus sinensis, sp. nov. from Mt. Funiu, Henan Province, China. The new genus is described and compared with related genera. The type specimen is deposited in the Hymenopteran Collection of Zhejiang University, China. 展开更多
关键词 HYMENOPTERA PROCTOTRUPIDAE new genus new species China
在线阅读 下载PDF
Dictyotenguna choui,a new genus and species of Dictyopharinae(Hemiptera:Fulgoromorpha:Dictyophar-idae) from China
15
作者 宋志顺 梁爱萍 《Entomotaxonomia》 CSCD 北大核心 2012年第2期207-214,共8页
A new Oriental dictyopharid genus and species, Dictyotenguna choui gen. n., sp. n., is described and illustrated from China. A brief review of the family Dictyopharidae from the Oriental and eastern Palaearctic Region... A new Oriental dictyopharid genus and species, Dictyotenguna choui gen. n., sp. n., is described and illustrated from China. A brief review of the family Dictyopharidae from the Oriental and eastern Palaearctic Regions is provided. 展开更多
关键词 HEMIPTERA DICTYOPHARIDAE new genus new species China
原文传递
A NEW GENUS OF THRIPIDAE(THYSANOPTERA),WITH TWO NEW SPECIES FROM CHINA
16
作者 张维球 童晓立 《Entomotaxonomia》 CSCD 1992年第2期81-86,共6页
The new genus Graminothrips and two new species G. cyperi and G. longisetosus are described from China.In the course of sorting out the grass-living thrips of South China, the authors found some interesting specimens.... The new genus Graminothrips and two new species G. cyperi and G. longisetosus are described from China.In the course of sorting out the grass-living thrips of South China, the authors found some interesting specimens. They belong to a new genus, Graminothrips, and two new species as described below. All types are preserved in the Insect Collection of South China Agricultural University. 展开更多
关键词 THRIPIDAE Graminothrips Graminothrips cyperi Graminothrips longisetosus New genus New species.
在线阅读 下载PDF
Illustrated Catalogue of the Genus Carabus of the World (Coleoptera,Carabidae)
17
作者 田明义 《动物分类学报》 CSCD 北大核心 2005年第3期605-605,共1页
关键词 COLEOPTERA 步甲科 genus 自然历史博物馆 昆虫系统学 昆虫种类 亚属 Moscow 形态特征 阶元
在线阅读 下载PDF
Chemical constituents from the Rhodiola genus plants 被引量:7
18
作者 周江韬 许磊 +2 位作者 陈燕燕 李晓男 姜苗苗 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2014年第7期433-445,共13页
The Rhodiola genus(Crassulaceae) is composed of about 90 species, mainly growing in high and cold regions. Some species are used as medicinal herbs to treat many diseases, such as cerebral hypoxia, cardiovascular di... The Rhodiola genus(Crassulaceae) is composed of about 90 species, mainly growing in high and cold regions. Some species are used as medicinal herbs to treat many diseases, such as cerebral hypoxia, cardiovascular disease, plateau response and so on. Up to now, about 180 constituents which are mainly glycosides, flavonoids, terpenoids, tannins, sterol and other compounds have been identified in the genus. The present review summarizes the chemical constituents isolated from the Rhodiola genus over the past few decades, with particular emphasis on Rhodiola crenulata(HK. f. et Thoms.) H. Ohba which is being studied by our research group. 展开更多
关键词 Rhodiola genus Chemical constituents Rhodiola crenulata
原文传递
Review of the genus Brachytarsophrys(Anura:Megophryidae),with revalidation of Brachytarsophrys platyparietus and description of a new species from China 被引量:6
19
作者 Yao Li Dan-Dan Zhang +8 位作者 Zhi-Tong Lyu Jian Wang Yu-Long Li Zu-Yao Liu Hong-Hui Chen Ding-Qi Rao Zhi-Fang Jin Chang-You Zhang Ying-Yong Wang 《Zoological Research》 SCIE CAS CSCD 2020年第2期105-122,共18页
The genus-level recognition of monophyletic short-legged toads(Brachytarsophrys)has been recently implicated in the taxonomic debate of Megophrys sensu lato.In the present study,Brachytarsophrys is reasonably regarded... The genus-level recognition of monophyletic short-legged toads(Brachytarsophrys)has been recently implicated in the taxonomic debate of Megophrys sensu lato.In the present study,Brachytarsophrys is reasonably regarded as a distinct genus based on significant morphological differentiations and recent molecular analyses.Furthermore,a comprehensive review of this genus is performed,with two species groups proposed based on morphological differences and phylogenetic relationships.Particularly,Brachytarsophrys platyparietus is removed as a synonym of Brachytarsophrys carinense and considered a valid species due to significant genetic divergence and distinct morphological differences.In addition,a new species,Brachytarsophrys orientalis sp.nov.,is described based on a series of specimens collected from southeastern China.This work takes the member species of the genus Brachytarsophrys to seven,suggesting that the diversity of Brachytarsophrys is underestimated.In addition,the genus levels of other monophyletic groups within the subfamily Megophryinae are discussed. 展开更多
关键词 genus level Megophryinae Morphology PHYLOGENY Revision
在线阅读 下载PDF
Species differentiation and identification in the genus of Helicobacter 被引量:5
20
作者 HUA Jie Song, ZHENG Peng Yuan and HO Bow 《World Journal of Gastroenterology》 SCIE CAS CSCD 1999年第1期12-14,共3页
Asearlyasnineteencentury,incidentalpresenceofspiralorganismswasnotedinthestomachsofdogs[1],ratsandcats[2].In... Asearlyasnineteencentury,incidentalpresenceofspiralorganismswasnotedinthestomachsofdogs[1],ratsandcats[2].Intheearlyyearsofth... 展开更多
关键词 HELICOBACTER genus SPECIES biological features BIOCHEMICAL tests IDENTIFICATION DIFFERENTIATION
在线阅读 下载PDF
上一页 1 2 16 下一页 到第
使用帮助 返回顶部