村务管理专业学生的教育管理研究          下载免费PDF全文

严英强  郝乐  栗明月 《北京农业职业学院学报》2021,35(4):91-95

随着国家乡村振兴战略的深入实施,村务管理专业学生招生规模迅速扩大,教育管理对乡村振兴发展、学院建设、个人成长具有重要意义.从分析学生的特点和教育管理现状入手,阐述了抓好村务管理专业学生教育管理的重要意义,提出把好招考入学、教书育人、考察使用关口,做好学院内部与外部管理结合、教育管理与精准服务结合、依法依规与沟通交流结合、教育引导与更新观念结合、宣传表彰与惩戒警示结合,加强学生的教育管理工作.  相似文献   

Correction to: Predation on glass eels of Japanese eel <Emphasis Type="Italic">Anguilla japonica</Emphasis> in the Tone River Estuary,Japan     

Yoichi Miyake  Aigo Takeshige  Hikaru Itakura  Hajime Itoh  Hiroaki Onda  Akira Yamaguchi  Akihito Yoneta  Kohma Arai  Yulina V. Hane  Shingo Kimura 《Fisheries Science》2018,84(6):1015-1016

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Alessandro Bonanno and Lawrence Busch (eds): Handbook of the international political economy of agriculture and food     

Marie Louise Ryan 《Agriculture and Human Values》2018,35(3):731-732

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Seasonal Changes in the Milt Quality of Waigieu Seaperch,Psammoperca waigiensis: Implications for Artificial Propagation          下载免费PDF全文

Minh Hoang Le  Hung Quoc Pham 《Journal of the World Aquaculture Society》2018,49(5):857-866

Milt quality of Waigieu seaperch was sampled at the beginning, the middle, and the end of the spawning season to assess if the sampling season has an effect on milt quality parameters. The milt volume and total sperm production were higher at the middle of the spawning season while the sperm concentration in milt was significantly higher at the beginning and the end of the spawning season. Sperm morphology and the major parameters of seminal plasma (pH, total protein, Mg²⁺, or Ca²⁺ concentrations) did not differ throughout the spawning season. The concentrations of Na⁺ and the osmolality increased throughout the spawning season. The percentage of motile cells did not differ during the spawning season while the duration of sperm motility (swimming duration) and velocity (swimming speed) were significantly different during the spawning season. The fertilization rate (75.7 ± 6.8%) and hatching rate (56.5 ± 3.1%) at the middle of the spawning season were higher than at the beginning and end periods. Results indicated that milt quality parameters and fertility success in the middle of the spawning season were higher compared to earlier and later sampling dates. Thus, we recommend collecting milt during this time for maximal fertilization and hatching success.  相似文献   

中国平背树螽属两新种(直翅目:螽斯科:树螽亚科)     

杨集昆  康乐 《中国农业大学学报》1990,(4):420-422

描述了平背树螽属2新种,定名为双刺平背树螽(Isopsera bicuspidota Yang etKang)和广西平背树螽(I.guangziensis Yang et Kang)。  相似文献   

17β-雌二醇-ARIS构建及其标准曲线的质量评估     

周乐  史远刚  李键  王建辰 《动物医学进展》2001,22(2):77-79

以 1 7β-雌二醇 -黄素腺嘌呤二核苷酸结合物为标记物 ,以葡萄糖氧化酶为全酶 ,建立了 1 7β-雌二醇脱辅基酶再激活免疫测定系统 (1 7β- E2 - ARIS) ,完成了两条标准曲线的制作 ,通过 logit代换法对两条标准曲线进行了直线回归。两条标准曲线的拟合度 (r)分别为0 .996 7* * 和 0 .9991 * * ,灵敏度分别为 1 1 .5 4pg· m L- 1 (2 . 31 pg·孔 - 1 )和 1 4.88pg·m L- 1 (2 . 98pg·孔 - 1 ) ,平均变异系数(CV% )分别为 4.6 4%和 9.34% ,测定范围为 31 .2 5～ 1 0 0 0 pg·m L- 1 。  相似文献   

USE OF MONOCLONAL ANTIBODY GB 24 and PROPIDIUM IODIDE FOR SIMULTANEOUS ASSESSMENT OF ACROSOMAL STATUS and VITALITY IN BOAR SPERMATOZOA     

P. Renard  B. Drénou  J.F. Griveau  D. Le Lannou 《Reproduction in domestic animals》1995,31(1):255-256

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江西省古树资源系统研究报告     

罗勤  丁思统  李健  刘强  王倩  孙乐  刘虹  朱学群 《江西林业科技》2004,(3):1-33

研究对象只限于散生于江西省山下及村落的30851株古树，不涉及自然保护区、森林公园中的古树。根据古树生长特征，分析其时间分布(古树级及树龄)、空间分布(设区市分布、县域分布)，借助于动态聚类统计分析方法从不同方向进行数量分类，并对数量分类成果用判别分析进行检验。最后对各县域每km^2和每万人负荷古树数进行核算，用数据资抖说明县域保护古树的重要性，增强县域保护古树的责任感。  相似文献   

17β─雌二醇主动免疫对公兔生殖的影响     

李键  刘智喜  周乐  武浩  贾维贞 《中国兽医学报》1997,(1)

以１７β－雌二醇－６－人血清白蛋白对新西兰公兔进行主动免疫，用ＲＩＡ检测抗体滴度和１７β－雌二醇及睾酮浓度，并检测睾丸重量和间质细胞面积。结果，试验组各兔均不同程度地产生了１７β－雌二醇抗体，其血浆１７β－雌二醇浓度极显著地低于对照组〔（２０．３±２１．６）ｎｇ／Ｌ，（１６７．７±４９．６）ｎｇ／Ｌ，Ｐ＜０．００１〕，睾酮浓度极显著地高于对照组〔（７．３±７．１）μｇ／Ｌ，（０．５２±０．２９）μｇ／Ｌ，Ｐ＜０．０１〕。每侧睾丸重量和间质细胞面积均极显著地大于对照组〔（３．９４±０．９３）ｇ和（２５２．２５±８５．７８）μｍ２，（２．９８±０．７２）ｇ和（１６１．７９±３６．４５）μｍ２，Ｐ＜０．０１和Ｐ＜０．００１〕。提示１７β－雌二醇主动免疫可望成为提高雄性动物生育力的有效途径之一  相似文献   

‘Plantibodies’: a flexible approach to design resistance against pathogens     

A. Schots  J. De Boer  A. Schouten  J. Roosien  J. F. Zil Verentant  H. Pomp  L. Bouwman-Smits  H. Overmars  F. J. Gommers  B. Visser  W. J. Stiekema  J. Bakker 《European journal of plant pathology / European Foundation for Plant Pathology》1992,98(2):183-191

Engineering resistance against various diseases and pests is hampered by the lack of suitable genes. To overcome this problem we started a research program aimed at obtaining resistance by transfecting plants with genes encoding monoclonal antibodies against pathogen specific proteins. The idea is that monoclonal antibodies will inhibit the biological activity of molecules that are essential for the pathogenesis. Potato cyst nematodes are chosen as a model and it is thought that monoclonal antibodies are able to block the function of the saliva proteins of this parasite. These proteins are, among others, responsible for the induction of multinucleate transfer cells upon which the nematode feeds. It is well documented that the ability of antibodies to bind molecules is sufficient to inactivate the function of an antigen and in view of the potential of animals to synthesize antibodies to almost any molecular structure, this strategy should be feasible for a wide range of diseases and pests.Antibodies have several desirable features with regard to protein engineering. The antibody (IgG) is a Y-shaped molecule, in which the domains forming the tips of the arms bind to antigen and those forming the stem are responsible for triggering effector functions (Fc fragments) that eliminate the antigen from the animal. Domains carrying the antigen-binding loops (Fv and Fab fragments) can be used separately from the Fc fragments without loss of affinity. The antigen-binding domains can also be endowed with new properties by fusing them to toxins or enzymes. Antibody engineering is also facilitated by the Polymerase Chain Reaction (PCR). A systematic comparison of the nucleotide sequence of more than 100 antibodies revealed that not only the 3′-ends, but also the 5′-ends of the antibody genes are relatively conserved. We were able to design a small set of primers with restriction sites for forced cloning, which allowed the amplification of genes encoding antibodies specific for the saliva proteins ofGlobodera rostochiensis. Complete heavy and light chain genes as well as single chain Fv fragments (scFv), in which the variable parts of the light (V_L) and heavy chain (V_H) are linked by a peptide, will be transferred to potato plants. A major challenge will be to establish a correct expression of the antibody genes with regard to three dimensional folding, assembly and intracellular location.  相似文献