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大鼠隔区一氧化氮合酶阳性神经元的分布和脑缺血后的变化 总被引:3,自引:0,他引:3
大鼠隔区一氧化氮合酶阳性神经元的分布和脑缺血后的变化DISTRIBUTIONANDISCHEMIAINDUCEDCHANGESOFNITRICOXIDESYNTHASEPOSITIVENEURONSINTHESEPTALAREAOFRAT关键词大鼠... 相似文献
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杏果实采后生理特征初探 总被引:1,自引:0,他引:1
杏果实采后生理特征初探杨映根,张立军,李钰(中国科学院植物研究所,北京100044)STUDIESONTHEPOSTHARVESTPHYSIOLOGICALPROPERTIESOFAPRICOTFRUITYangYing-gen;ZhangLijun... 相似文献
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棕背鼠最适生境及其主导因子分析THEOPTIMALBIOTOPEOFLARGE-TOOTHEDRAD-BACKEDVOLEANDTHEANALYSESOFITSMAINFACTORSKeywordsLarge-toothedrad-dackedvol... 相似文献
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抗寒剂CR-4在克服我县水稻低温烂秧中的作用赵玉华(甘肃高台县农业局734300)EFFECTOFTHEPLANTCOLD-RESISTERONOVERCO-MINGRICESEEDLINGDECAYINLOWTEMPERATURESTRESSINO... 相似文献
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蝴蝶兰实生苗不同器官的离体培养 总被引:30,自引:0,他引:30
蝴蝶兰实生苗不同器官的离体培养张秀清王志武刘玉敬王春英(山东省农业科学院玉米研究所,济南250100)THECULTUREOFDIFFERENTORGANSOFPHALAENOPSISSEEDLINGSINVITROZhangXiu-qingWang... 相似文献
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桃果实采后生理特性初探 总被引:5,自引:0,他引:5
桃果实采后生理特性初探杨映根,张立军,李钰(中国科学院植物研究所,北京100044)STUDIESONTHEPOSTHARVESTPHYSIOLOGYPKOPERTIESOFPEACHERUITYangYing-gen;ZhangLi-jun;LiY... 相似文献
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基于NOAA/AVHRR数据的中国主要植被类型NDVI变化规律研究 总被引:61,自引:0,他引:61
在遥感(RS)、地理信息系统(GIS)、全球定位系统(GPS)———3S支持下,利用连续时间序列的1km×1km分辨率的NOAAAVHRR数字影像,通过主分量分析和非监督分类,对中国植被进行了宏观分类。在多种基础图件的支持下,结合归一化植被指数(NDVI)年内季节变化规律,分出35个植被类型,9个植被型组。通过重建不同植被类型NDVI特征值10年的时间变化序列,划分出4个内部各类型NDVI变化过程具有相对一致性的区域(二级区域),明显的呈现从东南到西北的带状分布。再逐级归并,产生两个变化的一级区域。区域的界线基本与我国三大自然区域的东部季风区西北部的界线相吻合。进而从NDVI动态变化的角度进行了区划,包括2个一级区域,9个二级区域,进一步阐明了中国植被NDVI动态变化的区域差异。 相似文献
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Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis
It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis. 相似文献
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正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases 相似文献
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Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme
responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare
the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show
that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by
distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of
demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least
one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of
the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable
potent antiproliferative synthetic drugs. 相似文献
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RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
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JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献