首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
红松林不同演替阶段夏季鸟类群落研究   总被引:13,自引:1,他引:12  
红松林不同演替阶段夏季鸟类群落研究常家传鲁长虎刘伯文许青(东北林业大学,哈尔滨150040)StudyoftheBirdsCommunityStructureinDiferentSuccesionPeriodofKoreanPineForest.Ch...  相似文献   

2.
全球气候变化对小兴安岭阔叶红松林影响的动态模拟研究   总被引:19,自引:0,他引:19  
应用林窗模型(Forest Gap Model)及4种大气环流模式(General Girculation Models,GCMs)CO2加倍“平衡响应”数值试验结果模拟了小兴安岭阔叶红松林对未来气候变化的动态响应过程。结果表明,在美国高达空间研究实验室(Goddard Institute for Space Studies,简记GISS)和美国俄勒冈州大学(Oregon State Univer  相似文献   

3.
长白山北坡椴树红松林高等植物物种多样性   总被引:14,自引:6,他引:8  
长白山北坡椴树红松林高等植物物种多样性郝占庆,赵士洞,陶大立,王淼森(中国科学院沈阳应用生态研究所110015)SpeciesdiversityofhigherplantsinLimekoreanpineforestonnortkernslopeofChangbaimountain¥HaoZhanqing;ZhaoSidong;TaoDali;WangMiao(InstituteofAppliedEcology,AcadenziaSinica,Shenyang)China,110015):ChineseJoutrnalofEcology,1993,12(6):1-5.TheShannondiversityindexandevennessareusedtoanalysethespeciesdiversityofhigherplantsinlimekoreanpineforestonnorthernslopeofChangbaiMountain。TheresultsshowthatShannondiversityin-dexis2.8228forwoodyplants,2.9766forherbs;theSha  相似文献   

4.
小兴安岭阔叶红松林凋落物产量及动态的研究   总被引:7,自引:0,他引:7  
小兴安岭阔叶红松林凋落物产量及动态的研究刘传照,李景文,潘桂兰,李传荣(东北林业大学红松研究所,黑龙江带岭153106)LitterProductionandDynamicsinBroadleavcd-KoreanPineForestsinXiaoxinganMountaiils¥LiuChuanzhao;LiJingwen;PanGuilan;LiChuanrong(InstituteofKoreanPineStudies,NortbeastForestryUniversity,Dailing,Heilongjiang153106).ChneseJournalofEcology,1993,12(6):29-33.Three-yearstudywasdoneonlitterproductionanddynamicsunderbroadleaved-KoreanpineforestsintheXiaoxinganMountains。Resultsshowedthatannuallitterfallis4.25±0.17t.ha ̄(-1).yr ̄(-1).Amongtotallitterfall,leaflit  相似文献   

5.
改变林分结构提高松林对松毛虫的自控能力   总被引:1,自引:0,他引:1  
改变林分结构提高松林对松毛虫的自控能力周石涓,彭建文(湖南省林业科学研究所,长沙410004)ForestStructuralModificationinImprovingSelf-regulatingCapabilityofPineForestAgainstDen-drolimusPuncts¥ZhouShijuan;PengJianwen(HunanInstituteofforestryscience,Changsa410004).Chi-neseJournalofEcoloLyy,1993,12(5):9-12。Thispaperdescribesthesignificantchangesofforestbiologicalstructcure,succeedingfromsparsepurepineforesttopine-shrubmixedforestandtomulti-layerpine-broadleavedmixedforestcommunityduringthreedecadesofclosingmountainsandrearingforests。TheNaturalparasiti  相似文献   

6.
长白山阔叶红松林不同采伐强度与森林病害的发生袁志文,王庆礼,代力民,钟兆康,赵敏(中国科学院沈阳应用生态研究所110015)DifferentCuttingintensitiesandIncidenceofForestDiscasesinBroadL...  相似文献   

7.
Li Shi-you 《植物研究》1997,17(3):348-352
CAMPTOTHECALOWREYANA,ANEWSPECIESOFANTI-CANCERHAPPYTREESShi-youLiArthurTempleColegeofForestry,StephenF.AustinStateUniversityn...  相似文献   

8.
GM-CSF高亲和力受体至少由两条链组成,低亲和力的α链及无结合力活性的β链。本文采用RT-PCR的方法,从GM-CSF依赖细胞株TF-1中克隆了全长的GM-CSFRα链Cdna(包括信号肽部分),经酶切及全基因测序鉴定,并分别在原核及真核细胞表达系统中表达。在大肠杆菌中GM-CSFRα以GST融合蛋白形式表达,谷胱甘肽Sepharose4B亲和层析纯化融合蛋白。GSTCSFRαC无受体活性,推测主要与缺乏翻译后修饰有关。将全基因克隆入真核表达载体Psvl中,转染COS-7细胞瞬时表达以重建GM-CSF的低亲和力受体,125IGM-CSF平衡结合实验证明转染后的COS-7细胞膜上有受体的表达,Crosslinking显示表达的受体α链分子量略低于TF-1细胞。胞外区基因(CSFRαB)克隆入Psvl构建的Psvl/CSFRαB表达载体,转染COS-7细胞后,Westernblot检测表达细胞上清,有单一的反应带,表达上清有GM-CSF的受体活性。  相似文献   

9.
重组人粒细胞巨噬细胞集落刺激因子(GM-CSF)和人单核细胞趋化激活因子(MCAF)融合蛋白经SephadexG-75和CM-SepharoseFF两步柱层析,获得了电泳纯的GM-CSF/MCAF融合蛋白。为进一步研究其结构与功能,我们以纯化的该融合蛋白为抗原免疫家兔制备抗血清。DotELISA和Westernblot试验表明,该抗血清效价高、特异性好,可分别与GM-CSF/MCAF、GM-CSF和MCAF发生反应。  相似文献   

10.
红颊骨骼的解剖研究ANATOMICSTUDIESONTHESKELETONSYSTEMOFHERPESTESAUROPUNCTATUS红颊(Herpestesauropunctatus)是一种具有较高经济价值的小型哺乳动物,研究其骨骼的解剖结构...  相似文献   

11.
12.
13.
14.
15.
In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980.  相似文献   

16.
17.
18.
19.
20.
Evolution of living organisms is closely connected with evolution of structure of the system of regulations and its mechanisms. The functional ground of regulations is chemical signalization. As early as in unicellular organisms there is a set of signal mechanisms providing their life activity and orientation in space and time. Subsequent evolution of ways of chemical signalization followed the way of development of delivery pathways of chemical signal and development of mechanisms of its regulation. The mechanism of chemical regulation of the signal interaction is discussed by the example of the specialized system of transduction of signal from neuron to neuron, of effect of hormone on the epithelial cell and modulation of this effect. These mechanisms are considered as the most important ways of the fine and precise adaptation of chemical signalization underlying functioning of physiological systems and organs of the living organism  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号