首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   7463篇
  免费   47篇
  国内免费   14篇
林业   725篇
农学   236篇
基础科学   49篇
  914篇
综合类   332篇
农作物   507篇
水产渔业   460篇
畜牧兽医   3595篇
园艺   198篇
植物保护   508篇
  2022年   11篇
  2019年   10篇
  2018年   118篇
  2017年   185篇
  2016年   168篇
  2015年   235篇
  2014年   201篇
  2013年   156篇
  2012年   449篇
  2011年   301篇
  2010年   108篇
  2009年   72篇
  2008年   62篇
  2007年   39篇
  2006年   40篇
  2005年   774篇
  2004年   652篇
  2003年   446篇
  2002年   110篇
  2001年   130篇
  2000年   32篇
  1999年   148篇
  1992年   117篇
  1991年   145篇
  1990年   168篇
  1989年   147篇
  1988年   171篇
  1987年   113篇
  1986年   143篇
  1985年   117篇
  1984年   91篇
  1983年   81篇
  1982年   33篇
  1981年   17篇
  1980年   23篇
  1979年   133篇
  1978年   96篇
  1977年   91篇
  1976年   77篇
  1975年   138篇
  1974年   129篇
  1973年   116篇
  1972年   138篇
  1971年   118篇
  1970年   88篇
  1969年   102篇
  1968年   113篇
  1967年   125篇
  1966年   102篇
  1965年   70篇
排序方式: 共有7524条查询结果,搜索用时 31 毫秒
81.
82.
83.
With the intention of using the pig as a large animal model in haematopoietic research, a clonal assay in methylcellulose was developed and the optimal conditions for raising erythroid progenitors from adult pig bone marrow (BM) and peripheral blood (PB) have been established. Progenitor cells were stimulated to proliferate and differentiate in vitro by growth factors containing leucocyte condition medium (LCM), and with recombinant human erythropoietin (rhEpo). The number of PB BFU-E (burst forming units - erythroid) directly depended on the concentration of LCM, but BM BFU-E were not dependent on LCM. Both CFU-E (colony forming units - erythroid) and BFU-E were rhEpo dependent. Despite relatively high but expected individual variations, the mean number of colonies, as well as the functional characteristics of progenitor cells investigated, were similar to those of miniature pigs and some other mammals.  相似文献   
84.
The regulation of estrogen and progesterone receptor (ER, PR) expression by estradiol (E2) and progesterone (P4) in the oviduct, uterus and cervix of female lambs was studied. The animals received three intramuscular injections of E2, P4 or vehicle with an interval of 24 h and they were slaugthered 24 h after the third injection. Determinations of ER and PR were performed by binding assays and mRNAs of ER alpha and PR by solution hybridization. High levels of ER and PR in both cervix and oviduct were found in the female lamb, differing from other mammalian species. No significant effects by either E2 or P4 treatment on ER and PR levels in the cervix and oviduct could be observed. E2 treatment increased the mRNA levels of ERa and PR more than 3-fold in the cervix, while P4 treatment increased the mRNA levels of ERa and PR in the uterus. The results show differential effects of gonadal steroids on sex steroid receptor expression along the reproductive tract in female lambs, suggesting that steroid target tissues can modulate responses to the same circulating levels of steroid hormones.  相似文献   
85.
86.
For investigations of CO2-stunning of feeder- and slaughter-pigs parameters of behaviour, blood-gas-analyses and electroencephalograms were chosen. The following results were obtained: 1. Blood-gas-analyses proved that the CO2-stunning does not produce unconsciousness due to a lack of oxygen. 2. The criterias of general anaesthesia: unconsciousness, muscle-relaxation and analgesia with total reversibility could be confirmed. 3. The violent convulsive symptoms were evaluated as reactions identical with the stage II of GUEDEL's scheme of anaesthesia. 4. Muscular agitation, which sometimes appeared a few seconds before the stage of excitation, was judged to belong either to the start of the excitation phase or to the end of Guedel's stage of analgesia, during which the sensitivity is decreased. Neither study of behavior nor objective measurements showed, during the first 10 to 20 seconds of exposure to the CO2, any sign of pain or suffering related to the Act for Prevention of Cruelty to Animals, and accordingly such suffering should not be ascribed to the CO2 stunning method.  相似文献   
87.
88.
89.
90.
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