全文获取类型
收费全文 | 358篇 |
免费 | 10篇 |
国内免费 | 1篇 |
专业分类
林业 | 21篇 |
农学 | 5篇 |
基础科学 | 2篇 |
33篇 | |
综合类 | 13篇 |
农作物 | 19篇 |
水产渔业 | 27篇 |
畜牧兽医 | 229篇 |
园艺 | 3篇 |
植物保护 | 17篇 |
出版年
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 9篇 |
2013年 | 12篇 |
2012年 | 8篇 |
2011年 | 12篇 |
2010年 | 7篇 |
2009年 | 9篇 |
2008年 | 23篇 |
2007年 | 11篇 |
2006年 | 13篇 |
2005年 | 14篇 |
2004年 | 19篇 |
2003年 | 12篇 |
2002年 | 5篇 |
2001年 | 12篇 |
2000年 | 8篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1994年 | 2篇 |
1992年 | 19篇 |
1991年 | 10篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 14篇 |
1987年 | 8篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1979年 | 6篇 |
1978年 | 8篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 5篇 |
1974年 | 2篇 |
1973年 | 5篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1968年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有369条查询结果,搜索用时 15 毫秒
31.
Hirokazu Osabe Yasuo Morishima Yukihisa Goto Kazuhisa Masamoto Yoshiaki Nakagawa Toshio Fujita 《Pest management science》1992,34(1):27-36
The variations in the light-dependent herbicidal activity against Echinochloa oryzicola of a number of 4-pyridone-3-carboxanilides with various substituents on the anilide and pyridone rings have been examined by use of physicochemical substituent parameters and regression analysis. The effects of substituents of the anilide ring were such that the activity was related parabolically not only with the substituent hydrophobicity (π) but also with the steric bulk parameter (Es) of the bulkier ortho substituent. The effect of substituents at the 1-position of the pyridone ring was analysed with steric(STERIMOL L and B5) and electronic(γ1) parameters. That of substituents at the 5-position of the pyridone ring was explained by a parabolic function of a steric (MR) parameter. Analyses of the activity of 105 analogs confirmed that our previous selection of a candidate compound in this series for field trials was indeed appropriate in terms of physicochemical substituent effects. 相似文献
32.
33.
34.
Sequential isolation of rotavirus from individual calves 总被引:1,自引:0,他引:1
An outbreak of neonatal calf diarrhea was studied on a breeding farm of Japanese indigenous beef cattle. During the breeding season of 1982, 43 calves were born over the period 27 February-28 April. All but one of the calves suffered from neonatal diarrhea and 5 died. Bovine rotavirus was isolated in cell cultures from fecal specimens of 39 (90.7%) of the 43 calves during the outbreak, strongly suggesting that this was the causative agent; the virus was readily isolated from 81 (83.5%) of 97 specimens of diarrhea. Rotavirus was subsequently isolated from the feces of 7 of the calves in early May, more than one month after the initial virus isolation in early March. Two of these calves were again rotavirus-positive in early June, 41 days after the second virus isolation. Diarrhea had ceased in all 7 calves in March. Some antigenic differences were shown by the neutralization test between the early and later isolates from one of these calves, suggesting either re-infection with a serologically different virus, or persistent infection with the original virus following antigenic modulation. 相似文献
35.
T Yoshida R Harasawa Y Goto 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1991,38(8):630-634
Coding assignments of genome segments 1 and 2 of Chuzan virus strain K-47 were studied in vitro by using rabbit reticulocyte lysates. The double-stranded RNA segment was extracted from sodium dodecyl sulfate (SDS)-polyacrylamide gels by a modified crushing and eluting technique. Translation products labeled with [35S]methionine were resolved by SDS-polyacrylamide gel electrophoresis. The molecular weights of the products from RNA segments 1 and 2 were estimated to be 98 and 95 kilodaltons, respectively. 相似文献
36.
37.
38.
39.
40.
K Uchida H Nakayama S Tateyama N Goto 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1992,54(5):1023-1029
Immunohistochemical analysis of constituents of senile plaques and cerebro-vascular amyloid in the brain of aged dogs was performed using antisera against beta protein, cystatin C, ubiquitin, tau, and neurofilament (NF). All types of senile plaques and cerebro-vascular amyloid in aged dogs were labeled by anti-beta protein serum. Cystatin C immunoreactivity was detected in neuronal cell bodies, primitive or classical plaques, and amyloid deposited around cerebral capillaries, but not in diffuse plaques and amyloid deposited in the media tunica of cerebro-meningeal arterioles. Ubiquitin-positive granules distributed widely in both gray and white matter of aged dogs, while they were very small in number in young dogs. Swollen neurites-like materials in primitive plaques or classical plaques were immunoreactive for anti-ubiquitin serum. Tau immunostaining labeled commonly axons and several neuronal or glial cells after hydrate autoclave pretreatment. Tau-positive components were observed very rarely in the corona of classical plaques. Most of swollen neurites-like structures of primitive or classical plaques were not reactive for anti-NF serum, and only a few plaques contained small numbers of NF-positive elements. 相似文献