全文获取类型
收费全文 | 742篇 |
免费 | 29篇 |
国内免费 | 1篇 |
专业分类
林业 | 30篇 |
农学 | 14篇 |
基础科学 | 1篇 |
107篇 | |
综合类 | 80篇 |
农作物 | 17篇 |
水产渔业 | 24篇 |
畜牧兽医 | 444篇 |
园艺 | 21篇 |
植物保护 | 34篇 |
出版年
2020年 | 8篇 |
2019年 | 7篇 |
2018年 | 13篇 |
2017年 | 7篇 |
2016年 | 12篇 |
2015年 | 15篇 |
2014年 | 11篇 |
2013年 | 29篇 |
2012年 | 26篇 |
2011年 | 46篇 |
2010年 | 17篇 |
2009年 | 21篇 |
2008年 | 32篇 |
2007年 | 29篇 |
2006年 | 26篇 |
2005年 | 35篇 |
2004年 | 31篇 |
2003年 | 29篇 |
2002年 | 18篇 |
2001年 | 16篇 |
2000年 | 12篇 |
1999年 | 8篇 |
1998年 | 6篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 5篇 |
1993年 | 9篇 |
1992年 | 16篇 |
1991年 | 24篇 |
1990年 | 8篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 16篇 |
1985年 | 11篇 |
1983年 | 6篇 |
1982年 | 10篇 |
1981年 | 9篇 |
1980年 | 11篇 |
1979年 | 11篇 |
1978年 | 9篇 |
1977年 | 8篇 |
1976年 | 6篇 |
1975年 | 9篇 |
1974年 | 8篇 |
1973年 | 11篇 |
1972年 | 10篇 |
1971年 | 17篇 |
1970年 | 7篇 |
1961年 | 5篇 |
排序方式: 共有772条查询结果,搜索用时 15 毫秒
51.
Bronner-Fraser M 《Science (New York, N.Y.)》2004,303(5660):966-968
52.
Clonal characteristics of experimentally induced "atherosclerotic" lesions in the hybrid hare 总被引:2,自引:0,他引:2
T A Pearson J Dillman K J Williams J A Wolff R Adams K Solez R H Heptinstall H Malmros N Sternby 《Science (New York, N.Y.)》1979,206(4425):1423-1425
The female hybrid hare (Lepus timidus x Lepus europaeus) is heterozygous for electrophoretically separable, X-linked isoenzymes of glucose-6-phosphate dehydrogenase. The isoenzymes of this animal have been used as cellular markers in the study of the clonal origins of experimentally induced atherosclerotic lesions. Aortic lesions produced in the hybrid hare by feeding cholesterol and injuring the aortic wall with a catheter have been shown to have polyclonal characteristics and in this way are fundamentally different from atherosclerotic fibrous plaques in man. 相似文献
53.
Lethal effect of phenothiazine neuroleptics on the pathogenic protozoan Leishmania donovani 总被引:3,自引:0,他引:3
R D Pearson A A Manian J L Harcus D Hall E L Hewlett 《Science (New York, N.Y.)》1982,217(4557):369-371
Phenothiazine drugs, which are widely used for their antipsychotic, antianxiety, and antiemetic effects, have been found to have protozoacidal effects on the human pathogen Leishmania donovani. These compounds are lethal to both the extracellular stage of the organism, which is inoculated into humans by the sand fly, and the intracellular stage, which is found solely in human macrophages during established infection. 相似文献
54.
55.
Vanhollebeke B De Muylder G Nielsen MJ Pays A Tebabi P Dieu M Raes M Moestrup SK Pays E 《Science (New York, N.Y.)》2008,320(5876):677-681
The protozoan parasite Trypanosoma brucei is lysed by apolipoprotein L-I, a component of human high-density lipoprotein (HDL) particles that are also characterized by the presence of haptoglobin-related protein. We report that this process is mediated by a parasite glycoprotein receptor, which binds the haptoglobin-hemoglobin complex with high affinity for the uptake and incorporation of heme into intracellular hemoproteins. In mice, this receptor was required for optimal parasite growth and the resistance of parasites to the oxidative burst by host macrophages. In humans, the trypanosome receptor also recognized the complex between hemoglobin and haptoglobin-related protein, which explains its ability to capture trypanolytic HDLs. Thus, in humans the presence of haptoglobin-related protein has diverted the function of the trypanosome haptoglobin-hemoglobin receptor to elicit innate host immunity against the parasite. 相似文献
56.
Recombination of human mitochondrial DNA 总被引:1,自引:0,他引:1
Kraytsberg Y Schwartz M Brown TA Ebralidse K Kunz WS Clayton DA Vissing J Khrapko K 《Science (New York, N.Y.)》2004,304(5673):981
57.
58.
59.
60.
Kuiken T Rimmelzwaan G van Riel D van Amerongen G Baars M Fouchier R Osterhaus A 《Science (New York, N.Y.)》2004,306(5694):241
During the 2003 to 2004 outbreak of avian influenza A (H5N1) virus in Asia, there were anecdotal reports of fatal infection in domestic cats, although this species is considered resistant to influenza. We experimentally inoculated cats with H5N1 virus intratracheally and by feeding them virus-infected chickens. The cats excreted virus, developed severe diffuse alveolar damage, and transmitted virus to sentinel cats. These results show that domestic cats are at risk of disease or death from H5N1 virus, can be infected by horizontal transmission, and may play a role in the epidemiology of this virus. 相似文献