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   11595篇
  免费   3758篇
  国内免费   495篇
林业   618篇
农学   1065篇
基础科学   312篇
  2301篇
综合类   1600篇
农作物   502篇
水产渔业   2755篇
畜牧兽医   4958篇
园艺   190篇
植物保护   1547篇
  2024年   18篇
  2023年   92篇
  2022年   213篇
  2021年   366篇
  2020年   677篇
  2019年   1218篇
  2018年   1027篇
  2017年   1161篇
  2016年   1082篇
  2015年   1032篇
  2014年   996篇
  2013年   1252篇
  2012年   786篇
  2011年   831篇
  2010年   854篇
  2009年   464篇
  2008年   473篇
  2007年   307篇
  2006年   335篇
  2005年   306篇
  2004年   244篇
  2003年   291篇
  2002年   338篇
  2001年   253篇
  2000年   280篇
  1999年   109篇
  1998年   83篇
  1997年   79篇
  1996年   67篇
  1995年   60篇
  1994年   41篇
  1993年   54篇
  1992年   37篇
  1991年   29篇
  1990年   40篇
  1989年   35篇
  1988年   21篇
  1987年   25篇
  1986年   24篇
  1985年   22篇
  1984年   14篇
  1983年   17篇
  1982年   16篇
  1981年   13篇
  1979年   11篇
  1978年   14篇
  1974年   11篇
  1970年   12篇
  1964年   14篇
  1963年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
淡紫拟青霉菌料防治大豆胞囊线虫的后效研究   总被引:6,自引:2,他引:6  
淡紫拟青霉不同菌株的培养菌料,施225kg/hm2,对大豆胞囊线虫不但当年有45%~69%的较好防效,而且第2年和第3年仍然有22.5%~37.7%和7.3%~22.9%的后效,即空胞囊和被寄生的胞囊数量增加。  相似文献   
42.
AIM: To explore the role of Akt signal pathway in apoptosis of neural cells in adult rats treated with Zuogui Pill, a Chinese medicine. METHODS: Flowcytometry and Western blotting methods were used to investigate the changes of cellular apoptosis rate and Akt signal pathway. RESULTS: Monosodium glutamate (MSG) could increase cellular apoptosis rate and significantly restrained the phosphorylation of Akt (Ser473) and Akt (Thr308), and markedly increased the levels of phospho-FKHR (ser256), GSK-3β (Ser9) and PTEN. Zuogui Pill partly inhibited the above effects of MSG. CONCLUSION: Zuogui pill effectively inhibits the neural apoptosis induced by MSG, and Akt pathway is involved in the neuronal protection of Zuogui pill.  相似文献   
43.
反刍动物对不同方法加工处理青粗饲料的利用效果   总被引:5,自引:0,他引:5  
总结了农作物秸秆、青贮饲料和苜蓿的国内外加工处理方法及反刍动物对其的利用效果。  相似文献   
44.
The aim of these experiments was to investigate the potential antiviral effect of Saccharomyces cerevisiaeβ‐glucan on the pneumonia induced by swine influenza virus (SIV). Forty colostrum‐deprived 5‐day‐old piglets were randomly divided into four groups of 10. The 20 pigs in groups 1 and 2 were administered Saccharomyces cerevisiaeβ‐glucan orally (50 mg/day/pig; En‐Bio Technology Co., Ltd) for 3 days before SIV infection and those in groups 3 and 4 were given culture medium/diluent alone. Groups 1 and 3 were inoculated intranasally with 3 ml of tissue culture fluid containing 2 × 106 tissue culture infective doses 50% (TCID50)/ml of SIV and those in groups 2 and 4 were exposed in the same manner to uninfected cell culture supernatant. The microscopic lung lesions induced by SIV infection (group 1 pigs) were significantly more severe than those induced by infection in animals pre‐administered β‐glucan (group 3) (P < 0.05). Significantly more SIV nucleic acid was detected in the lungs of pigs experimentally infected with SIV only (group 1) at 5, 7 and 10 days post‐inoculation (dpi) compared with lungs from pigs pre‐administered β‐glucan and infected with SIV (group 3) (P < 0.05). The concentrations of interferon‐γ (IFN‐γ) and nitric oxide (NO) in bronchoalveolar lavage fluid from pigs pre‐administered β‐glucan and infected with SIV (group 3) were significantly higher than for any other group at 7 and 10 dpi for IFN‐γ, and at 5, 7 and 10 dpi for NO (P < 0.05). Saccharomyces cerevisiaeβ‐glucan reduced the pulmonary lesion score and viral replication rate in SIV‐infected pigs. These findings support the potential application of β‐glucan as prophylactic/treatment agent in influenza virus infection.  相似文献   
45.
The original article to which this Correction refers was published in Pest Management Science 58 (7): 649–662 (2002).Copyright © 2004 Society of Chemical Industry  相似文献   
46.
Su  H.  Hwang  S. F.  Chang  K. F.  Conner  R. L.  Howard  R. J.  Turbull  G. D.  Blade  S. F. 《植物病害和植物保护杂志》2004,111(1):64-70
Journal of Plant Diseases and Protection - The infection process of Erysiphe pisi on field pea cvs. ‘Highlight’ and ‘Tara’ carrying resistance gene erl, line...  相似文献   
47.
The study investigated the ultrastructural characteristics of tubular gland and duct cells, as well as luminal gland cells in the isthmus region of the oviduct of laying and natural moulting hens. Tubular glands in laying birds were composed of type 1 and 2 cells. Based on the preponderance of each cell type, in relation to the location of a developing egg in the oviduct of the domestic fowl, these gland cells may represent different functional states of the same cell. The findings of the study on natural moulting birds suggest that autophagy is a process confined to the early stages of degeneration, while necrosis occurs in the terminal stages.  相似文献   
48.
49.
50.
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