全文获取类型
收费全文 | 70887篇 |
免费 | 3965篇 |
国内免费 | 34篇 |
专业分类
林业 | 3226篇 |
农学 | 2529篇 |
基础科学 | 477篇 |
8705篇 | |
综合类 | 11415篇 |
农作物 | 2607篇 |
水产渔业 | 3641篇 |
畜牧兽医 | 36613篇 |
园艺 | 907篇 |
植物保护 | 4766篇 |
出版年
2018年 | 1053篇 |
2017年 | 1129篇 |
2016年 | 1059篇 |
2015年 | 908篇 |
2014年 | 1137篇 |
2013年 | 2631篇 |
2012年 | 2062篇 |
2011年 | 2462篇 |
2010年 | 1684篇 |
2009年 | 1751篇 |
2008年 | 2594篇 |
2007年 | 2363篇 |
2006年 | 2326篇 |
2005年 | 2124篇 |
2004年 | 2193篇 |
2003年 | 2165篇 |
2002年 | 2036篇 |
2001年 | 2366篇 |
2000年 | 2375篇 |
1999年 | 1925篇 |
1998年 | 912篇 |
1997年 | 821篇 |
1996年 | 782篇 |
1995年 | 861篇 |
1994年 | 843篇 |
1993年 | 768篇 |
1992年 | 1523篇 |
1991年 | 1542篇 |
1990年 | 1662篇 |
1989年 | 1507篇 |
1988年 | 1450篇 |
1987年 | 1340篇 |
1986年 | 1384篇 |
1985年 | 1336篇 |
1984年 | 1128篇 |
1983年 | 1025篇 |
1982年 | 628篇 |
1979年 | 1004篇 |
1978年 | 795篇 |
1977年 | 717篇 |
1976年 | 676篇 |
1975年 | 719篇 |
1974年 | 766篇 |
1973年 | 830篇 |
1972年 | 803篇 |
1971年 | 748篇 |
1970年 | 729篇 |
1969年 | 744篇 |
1967年 | 658篇 |
1966年 | 631篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
201.
Two experiments, using the ligated intestinal segment technique, were conducted to determine whether the pituitary hormone prolactin (PRL) could reduce Escherichia coli-induced fluid loss into the small intestine of 2- to 3-week-old pigs. Inoculation of 10(6) to 10(8) enteropathogenic E coli organisms into ligated jejunal segments caused a significant accumulation of luminal fluid within 12 hours. In the first experiment, intraluminal inoculation with 0.5 mg of ovine PRL along with the bacteria did not have any effect on fluid accumulation. Systemic IV treatment of the animals with 1.0 mg of ovine PRL at 3-hour intervals, beginning either immediately after or 9 to 10 hours before intestinal ligation, did not significantly (P less than 0.05) reduce fluid accumulation as compared with control animals. In the second experiment, IM administration of 100 microgram of thyrotropin-releasing hormone (TRH) at 3-hour intervals, beginning 6 hours before intestinal ligation, significantly (P less than 0.05) increased circulating PRL concentrations, as measured by radioimmunoassay. However, TRH treatment did not reduce the accumulation of luminal fluid in E coli-inoculated segments. 相似文献
202.
203.
P J Durham B C Farquharson B J Stevenson 《New Zealand veterinary journal》1979,27(12):266, 271-266, 272
204.
K. P. Bland 《Veterinary research communications》1979,3(1):125-136
The function and suppression of urine spraying by cats is discussed as also is the source of tom-cat odour. It seems unlikely that tom-cat odour is derived from the lipid in the proximal convoluted tubule of the kidney, however its production by the anal glands has not yet been proven. Although male cats show a flehmen response when sniffing urine, smell seems to play a more important role in reproduction in the female than the male. The available data suggests that valeric acid may function as a female/female pheromone in cats by inducing or facilitating oestrus. Nepetalactone, the active ingredient of catnip, is probably not related to any naturally occurring pheromone in the cat but simply acts as an hallucinogenic drug. 相似文献
205.
206.
207.
208.
Timmer CP 《Science (New York, N.Y.)》1979,205(4404):385-386
209.
210.
In a consecutive and non-selected study of 54 kidney transplanted dogs, 12 cases of intussusception of the small intestine developed in 8 dogs. The patogenesis is still unknown. It has been postulated that the time of the operation (4--7 hours) and the segmental termination of the post-operative atony in the intestine are essential factors in this fatal complication. The last 16 dogs in this material were peroperatively treated with antikolinergics (Mestinon NFN), which was continued until normal function of the intestine. In these dogs there were no evidence of intussusception. The value of this profylaxis is open to discussion and it is essential to solve the problem of intussusception through a "blind" and controlled trial. 相似文献