全文获取类型
收费全文 | 6303篇 |
免费 | 672篇 |
国内免费 | 17篇 |
专业分类
6992篇 |
出版年
2021年 | 109篇 |
2020年 | 49篇 |
2019年 | 53篇 |
2018年 | 70篇 |
2016年 | 120篇 |
2015年 | 169篇 |
2014年 | 204篇 |
2013年 | 270篇 |
2012年 | 344篇 |
2011年 | 349篇 |
2010年 | 195篇 |
2009年 | 175篇 |
2008年 | 203篇 |
2007年 | 272篇 |
2006年 | 246篇 |
2005年 | 198篇 |
2004年 | 207篇 |
2003年 | 241篇 |
2002年 | 194篇 |
2001年 | 230篇 |
2000年 | 196篇 |
1999年 | 165篇 |
1998年 | 85篇 |
1997年 | 73篇 |
1996年 | 76篇 |
1995年 | 84篇 |
1994年 | 72篇 |
1993年 | 66篇 |
1992年 | 121篇 |
1991年 | 112篇 |
1990年 | 114篇 |
1989年 | 95篇 |
1988年 | 107篇 |
1987年 | 99篇 |
1986年 | 70篇 |
1985年 | 102篇 |
1984年 | 74篇 |
1983年 | 72篇 |
1982年 | 56篇 |
1980年 | 56篇 |
1979年 | 81篇 |
1978年 | 82篇 |
1977年 | 52篇 |
1976年 | 65篇 |
1975年 | 72篇 |
1974年 | 64篇 |
1973年 | 62篇 |
1972年 | 64篇 |
1971年 | 53篇 |
1969年 | 53篇 |
排序方式: 共有6992条查询结果,搜索用时 15 毫秒
991.
Regulation of the antibody response to type 3 pneumococcal polysaccharide. 3. Role of regulatory T cells in the development of an IgG and IgA antibody response 总被引:10,自引:0,他引:10
D R Barthold B Prescott P W Stashak D F Amsbaugh P J Baker 《Journal of immunology (Baltimore, Md. : 1950)》1974,112(3):1042-1050
992.
993.
Acid phosphatase in plant tissues I. Changes in activity and multiple forms in tea leaves and tomato fruit during maturation and senescence 总被引:3,自引:0,他引:3
Multiple forms of acid phosphatase varied in tea leaves (Camelliasinensis L.) depending on variety and the age of the leaves.Polyacrylamide gel electrophoresis indicated the presence ofsix multiple forms in extracts of young leaves and seven inextracts of mature leaves of the variety Hatzumomizi. VarietyBenihomare showed five bands in zymograms of young-leaf extractsand six in zymograms of mature-leaf extracts. In addition tothe appearance of the new band, the relative intensity of stainingin two other bands changed during maturation. One decreasedand one increased in intensity. The components were partiallyseparated by CM-cellulose chromatography and isoelectric focusing.Total activity of acid phosphatase did not change greatly ona fresh-weight basis during maturation and aging. Extracts of immature green tomato (Lycopersicon esculentum Mill.)fruit showed six bands on polyacrylamide gels. Isoelectric focusingand subsequent electrophoresis of the fractions obtained atdifferent pH values, produced evidence for seven acid phosphatasecomponents in tomato extracts. Unlike the situation with certainother climacteric fruit, acid phosphatase in tomato extractsdecreased steadily during ripening to a level of activity only2540% that of immature green fruit extracts. It is thereforeconcluded that the onset of senescence in climacteric fruitsis not dependent on an increase in acid phosphatase. Substratespecificity, response to inhibitors, Km, and pH optima of partiallypurified fractions were similar to those of tea-leaf extracts. (Received November 29, 1972; ) 相似文献
994.
Summary Ultrastructural studies of the asexual plurilocular reproductive stages of the brown algaEctocarpus have been made. The zoospores released from the plurilocular sporangia were found to attach to surfaces by means of an adhesive whose site of formation has been shown to be the Golgi apparatus. A preliminary cytochemical investigation has shown that the adhesive contains polysaccharide. This forms the basis for a more precise chemical characterization of the adhesive material. 相似文献
995.
996.
997.
998.
The evidence presented in this paper supports the conclusion that at least 85 per cent of the oxygen uptake of the respiring tissue of potato tuber enters the chemistry of the cell by way of a tyrosinase-catalyzed oxidation. The qualitative aspects of this conclusion are in agreement with the claim made by Boswell and Whiting. However, the evidence offered by them in support of this conclusion is shown to be inadequate. 相似文献
999.
1000.