全文获取类型
收费全文 | 2214篇 |
免费 | 130篇 |
国内免费 | 2篇 |
出版年
2023年 | 12篇 |
2022年 | 23篇 |
2021年 | 55篇 |
2020年 | 21篇 |
2019年 | 33篇 |
2018年 | 40篇 |
2017年 | 45篇 |
2016年 | 73篇 |
2015年 | 93篇 |
2014年 | 129篇 |
2013年 | 137篇 |
2012年 | 188篇 |
2011年 | 161篇 |
2010年 | 127篇 |
2009年 | 124篇 |
2008年 | 133篇 |
2007年 | 123篇 |
2006年 | 105篇 |
2005年 | 102篇 |
2004年 | 105篇 |
2003年 | 106篇 |
2002年 | 76篇 |
2001年 | 32篇 |
2000年 | 22篇 |
1999年 | 19篇 |
1998年 | 21篇 |
1997年 | 18篇 |
1996年 | 17篇 |
1995年 | 18篇 |
1994年 | 12篇 |
1993年 | 11篇 |
1992年 | 8篇 |
1991年 | 7篇 |
1990年 | 9篇 |
1989年 | 8篇 |
1988年 | 9篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 13篇 |
1984年 | 11篇 |
1983年 | 7篇 |
1982年 | 6篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1976年 | 7篇 |
1975年 | 6篇 |
1974年 | 10篇 |
1964年 | 3篇 |
1948年 | 3篇 |
排序方式: 共有2346条查询结果,搜索用时 15 毫秒
31.
32.
Viguiera eriophora yielded the sesquiterpene lactones erioflorin, acetylerioflorin and 17,18-dehydroviguiepinin, which was correlated with tetrahyd 相似文献
33.
C Mangoni di S Stefano M Ruggiero M Brunese S Morelli 《Bollettino della Società italiana di biologia sperimentale》1979,55(14):1398-1404
Metabolic rate of obese patients is reported, recorded to cellular active mass. The metabolic rate is higher in obese patients and the value is diucthy related to individual actual weight. The dinamic-specific action of proteins is normal. 相似文献
34.
35.
B Perussia L Mangoni H D Engers G Trinchieri 《Journal of immunology (Baltimore, Md. : 1950)》1980,125(4):1589-1595
The production of interferon (IF) by human and mouse lymphocytes sensitized to alloantigens in mixed lymphocyte cultures (MLC) was analyzed. During primary MLC, IF appeared in the culture fluid on day 2 and was maximal on day 5. Based on several biologic criteria, the IF produced is of the "immune" type. When lymphocytes sensitized to alloantigens were reestimulated in vitro, IF was produced within a few hours of culture. In all stimulated cultures, cell proliferation was observed in spite of the high concentrations of IF. The IF-producing cells in human MLC were identified as T lymphocytes lacking the receptor for the Fc fragment of IgG molecules (Fc gamma R(-)). Human MLC supernatants containing immune type IF mediate the enhancement of natural killer (NK) cell activity and protect NK target cells from lysis. 相似文献
36.
37.
Alfonso L. Pogolotti Kathryn M. Ivanetich Hans Sommer Daniel V. Santi 《Biochemical and biophysical research communications》1976,70(3):972-978
Studies are reported on the FdUMP-CH2-H4 folate-peptide obtained upon proteolysis of the complex formed from thymidylate synthetase, FdUMP and 5,10-CH2-H4folate. Contrary to a previous report from this laboratory, the peptide does contain a cysteine residue. The sequence of the largest peptide obtained is Ala-Leu-Pro-Pro-(His,Cys)-Thr. Quantitative modification of the histidine residue with the Pauly reagent indicates that imidazole is not directly linked to the nucleotide. The stability of the peptide indicates the covalent bond to the cofactor involves its 5-nitrogen; from this, it may be concluded that the reactive form of the cofactor is the 5-iminium ion. 相似文献
38.
39.
40.
Suzanne M. Marselis Katharine Abernethy Alfonso Alonso John Armston Timothy R. Baker Jean‐Francois Bastin Jan Bogaert Doreen S. Boyd Pascal Boeckx David F. R. P. Burslem Robin Chazdon David B. Clark David Coomes Laura Duncanson Steven Hancock Ross Hill Chris Hopkinson Elizabeth Kearsley James R. Kellner David Kenfack Nicolas Labrire Simon L. Lewis David Minor Herv Memiaghe Abel Monteagudo Reuben Nilus Michael O'Brien Oliver L. Phillips John Poulsen Hao Tang Hans Verbeeck Ralph Dubayah 《Global Ecology and Biogeography》2020,29(10):1799-1816