GIS在生态土地分类中的作用     

肖宝英  邵国凡等 《林业研究》2002,13(1):56-60

This paper depicted the physiographic landscape features and natural vegetation situation of study area (the eastern Jilin Province), and expatiates the definition, basic characters and its development of Ecological Land Classification (ELC). Based on the combination of relief map, satellite photography for study area and vegetation inventory data of 480 sample sites, a 5-class and a 15-class ecological land type map was concluded according to 4 important factors including slope, aspect, vegetation and elevation. Ecological Classification System (ECS) is a method to identify, characterize, and map ecosystems. The Ecological Land Type (ELT) was examined and applied initially in eastern Jilin Province. Foundation item: This paper was supported by Chinese Academy of Sciences “100 people” project and the Open Research Station of Changbai Mountain Forest Ecosystem. Biography: XIAO Bao-ying (1974-), female, postgraduate in Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, P. R. China Responsible editor: Zhu Hong  相似文献   

中国美利奴羊(新疆型)无角类型培育理论依据及测交试验结果   总被引：1，自引：0，他引：1  

左北瑶 《中国草食动物》2006,26(4):3-6

绵羊角的有无是由或主要由一个基因位点（Locus）上的三个等位基因（H、h’、h）所决定。三个等位基因的遗传方式是：H为显性无角基因，对h为完全显性，即Hh基因型均表现无角性状；h为隐性有角基因，即hh基因型均表现有角性状；h，为一个频率很低的基因，对h为不完全显性，即h＇h基因型仍表现为有角性状；但H对h’基因为不完全显性，即Hh’基因型可能出现角痕（角突或角基）。而h’h’基因型公羊表现为小角、发育残缺不全的矫型角，母羊表现为无角。培育无角革的关键是选择使用无角公羊，通过测交试验能确定无角公羊基因的纯合度，从而决定如何使用。  相似文献   

Evaluation of a radioimmunoassay for type III procollagen peptide in the dog     

Dimski DS  Brooks CL  Johnson SE 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1990,19(2):40-44

Type III procollagen peptide (P-3-P) is a serum marker for hepatic fibrosis in humans. The utility of a commercially available radioimmunoassay for P-3-P was evaluated in the dog. The specificity of the assay was assessed by polyacrylamide gel electrophoresis (PAGE) of canine serum and purified bovine P-3-P, followed by Western immunoblotting with rabbit aniti-P-3-P serum. The sensitivity was assessed by performing the radioimmunoassay on dilutions of sera from 22 dogs. Polyacrylamide gel electrophoresis of purified bovine P-3-P and sera from two dogs suspected of having elevated P-3-P concentrations revealed no homologous bands of staining. Western immunoblotting showed marked cross-reactivity of the high antisera concentrations with several components of the serum proteins, but none corresponding to the purified P-3-P. All tested sera from dogs had minimal competitive binding with radiolabeled P-3-P in the radioimmunoassay. Dilution curves of dog sera did not parallel either the standard curve or the dilution curve of a known test human serum. There were no statistically different P-3-P concentrations in any of the groups of dogs studied. It was concluded that currently available radioimmunoassay kits for the measurement of P-3-P in the human are not applicable in the dog. Seemingly, the structure or metabolism of canine P-3-P may vary significantly from that of the bovine or human, limiting the sensitivity and specificity of this assay in the dog.  相似文献   

青海省都兰县天然草地盐生植物资源种类及利用研究     

梁泽胜 《安徽农业科学》2011,39(27):16757-16758

从青海省都兰县基本情况出发,介绍了都兰县盐生植物的分布和盐生植物资源种类,并阐述了其盐生植物资源的利用情况。  相似文献   

Ultrastructural impairment of islet microvascular endothelial cells in STZ-induced type 1 diabetic mice     

ZHANG Xu  LIU Ming-ming  CHENG Ming  XU Jin  WANG Shu-he  WANG Hui  REN Ya-li  XIU Rui-juan  WANG Su-xia 《园艺学报》2015,31(8):1520

AIM: To investigate the ultrastructural changes of islet microvascular endothelial cells in STZ-induced type 1 diabetic mice. METHODS: BALB/c mice were randomly divided into diabetic group and control group. The expression of insulin and platelet-endothelial cell adhesion molecule-1 (CD31) in islet microvessels was detected by immunohistochemical staining. The ultrastructural changes of islet β cells and islet microvessels were observed under transmission electron microscope. RESULTS: Compared with control group, the number of islet β cells, ratio of β cells/α cells, average number of secretory granules in β cells and insulin expression area per islet in diabetic group were significantly decreased (P<0.01). Besides, diabetic group had fewer microvessels with lower expression of CD31 (P<0.01). Mitochondria in islet microvascular endothelial cells and pericytes in diabetic group were swelling. The basement membrane of islet microvessels became thicker in diabetic group (P<0.01). CONCLUSION: Islet microvascular endothelial cells were impaired in type 1 diabetic mice.  相似文献   

天气衍生品的运作机制与精算定价     

谢世清  梅云云 《湖南农业大学学报(自然科学版)》2011,(6):39-43

天气衍生品是为了规避天气风险给天气敏感行业带来收入的不稳定性而兴起的创新型风险管理工具，其实质是通过衍生合约对天气风险进行分割、重组和交易的证券化产品。不同于传统金融衍生品，天气衍生品的价值取决于温度、湿度或降雨量等天气指数。本文在分析天气衍生品市场发展的基础上，重点探讨了最常见的天气期货和天气期权的运作机制及其精算定价。  相似文献   

河洛农业历法及其对台湾地区的影响     

郭新建 《安徽农业科学》2012,40(16):9183-9184

古河洛地区,即黄河与洛水交汇之流域,远古及夏商周先民在这片中华民族的中原腹地开创灿烂农业文明的同时,开创了领先世界的历法文明。他们以卓越的智慧造就了天象历法、干支纪日和四分历法,以及24节气历法,极大地推动了社会的进步与发展。随着河洛文明不断向域外扩展,气象历法也紧跟民族融合的步伐传入台湾地区,在该地区生根生长,发挥着其独特的动能。台湾历法文明根在河洛。  相似文献   

Genetic cause of autosomal recessive hereditary nephropathy in the English Cocker Spaniel   总被引：1，自引：0，他引：1  

Davidson AG  Bell RJ  Lees GE  Kashtan CE  Davidson GS  Murphy KE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2007,21(3):394-401

  相似文献   

MicroRNA-9-5p mediates sympathetic overactivity by targeting KCNN3 in paraventricular nucleus of rats with T2D     

XU Jia-qi  AN Mei-ling  YUAN Yue  HAO Yi-fan  WANG Xiu-wen  ZHANG Min  WEI Xiao-wei  LI Hua  WANG Ren-jun 《园艺学报》2021,36(12):2148-2158

AIM To investigate whether microRNA-9-5p （miR-9-5p） mediates sympathetic overactivity by targeting KCNN3 （potassium intermediate/small conductance calcium-activated channel, subfamily N, member 3） gene,which encoded small-conductance calcium-activated potassium channel 3 （SK3） protein, in paraventricular nucleus （PVN） of rats with type 2 diabetes mellitus （T2D）. METHODS A rat model of T2D was established by high-fat diet combined with intraperitoneal injection of 30 mg/kg streptozotocin. The levels of miR-9-5p and KCNN3 mRNA in PVN were detected by real-time PCR. The relationship between KCNN3 and miR-9-5p was predicted by TargetScan. Recombinant adeno-associated virus （rAAV）-miR-9-5p or KCNN3 were bilaterally microinjected into the PVN to observe the changes in plasma glucose levels and sympathetic drive indicators. The number of FosB and SK3 positive cells was measured by immunofluorescence staining. The protein expression of SK3 was determined by Western blot. The relationship between KCNN3 and miR-9-5p were confirmed by cell transfection and dual-luciferase reporter assay. RESULTS Compared with the rats in diabetes control （DC） group, the blood glucose, sympathetic drive indexes and the level of miR-9-5p in PVN were significantly increased, while the SK3 expression in PVN was obviously reduced in the diabetes mellitus （DM） rats. After microinjecion of rAAV-miR-9-5p in PVN, the sympathetic drive indexes, blood glucose, and the number of FosB-positive cells were increased significantly, but the SK3 protein expression was significantly reduced （P<0.05）. However, up-regulation of KCNN3 in PVN had the opposite effect. These responses were obviously enhanced in DM rats compared with DC rats. The results of cell transfection and dual-luciferase reporter assay demonstrated that miR-9-5p bound to the 3’-UTR of KCNN3 and inhibit its expression. CONCLUSION miR-9-5p was up-regulated in PVN of the rats with T2D, and it may mediate sympathoexcitation by targeting KCNN3.  相似文献   

2011年龙眼挂果率高的气象成因分析     

陈国保 《中国果业信息》2012,41(1)

通过对2010/2011年度玉林市龙眼秋梢抽生期—开花着果期的农业气象条件进行诊断分析,得出2011年挂果率高的主要原因是：2010年8—9月份的光温水条件配合较好对秋梢抽生相当有利,紧接着从10份开始出现了秋、冬、春三季连旱,冬季和早春的气候也比较寒冷,在干旱和寒冷的双重作用下,非常有利于控制冬梢和促进花芽分化,也有利于抑制抽穗期间“冲梢”现象的发生,因此成花情况普遍良好;由于2011年开花期比正常年景偏迟了将近1个月,因此很好地避过了正常年份开花着果期的低温阴雨天气,使得2011年出现了花多果也多的喜人景象,挂果率是最近几年中最好的一年。在今后的龙眼生产中,应根据龙眼的开花结果习性和玉林市的气候特点,采取一些相应的对策,加强管理,以最大限度地提高挂果率。  相似文献