全文获取类型
收费全文 | 14649篇 |
免费 | 442篇 |
国内免费 | 13篇 |
出版年
2021年 | 147篇 |
2020年 | 143篇 |
2019年 | 146篇 |
2018年 | 333篇 |
2017年 | 304篇 |
2016年 | 411篇 |
2015年 | 426篇 |
2014年 | 549篇 |
2013年 | 698篇 |
2012年 | 698篇 |
2011年 | 730篇 |
2010年 | 437篇 |
2009年 | 324篇 |
2008年 | 459篇 |
2007年 | 497篇 |
2006年 | 482篇 |
2005年 | 429篇 |
2004年 | 365篇 |
2003年 | 400篇 |
2002年 | 356篇 |
2001年 | 310篇 |
2000年 | 258篇 |
1999年 | 203篇 |
1998年 | 103篇 |
1992年 | 248篇 |
1991年 | 238篇 |
1990年 | 184篇 |
1989年 | 224篇 |
1988年 | 245篇 |
1987年 | 250篇 |
1986年 | 225篇 |
1985年 | 257篇 |
1984年 | 202篇 |
1983年 | 168篇 |
1982年 | 86篇 |
1979年 | 242篇 |
1978年 | 159篇 |
1977年 | 138篇 |
1976年 | 142篇 |
1975年 | 171篇 |
1974年 | 273篇 |
1973年 | 267篇 |
1972年 | 253篇 |
1971年 | 251篇 |
1970年 | 256篇 |
1969年 | 246篇 |
1968年 | 188篇 |
1967年 | 191篇 |
1966年 | 172篇 |
1965年 | 125篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
A Ba?sset J Cotonat P Montastruc 《Comptes rendus des séances de la Société de biologie et de ses filiales》1975,169(2):444-448
The authors have studied in the dog--normal or diabetic insipidus after hypothalamic lesion--submitted to oral ingestion of ethanol the effects of a few antidiuretic drug: chlorpropamid, atromid-S, carbamazepin and carisoprodol. The carisoprodol only can reduce the diuresis and the drinking provoked by ethanol. 相似文献
5.
6.
7.
Jin Wei Mia Madel Alfajaro Peter C. DeWeirdt Ruth E. Hanna William J. Lu-Culligan Wesley L. Cai Madison S. Strine Shang-Min Zhang Vincent R. Graziano Cameron O. Schmitz Jennifer S. Chen Madeleine C. Mankowski Renata B. Filler Neal G. Ravindra Victor Gasque Fernando J. de Miguel Ajinkya Patil Huacui Chen Craig B. Wilen 《Cell》2021,184(1):76-91.e13
- Download : Download high-res image (212KB)
- Download : Download full-size image
8.
We isolated a recombinant H9N2 avian influenza virus (AIV) from fresh egret feces in the Ardeidae protection region of the Dongting Lake wetland area in China, and it was designated A/Egret/Hunan/1/2012(H9N2). This is the first report of isolating H9N2 AIV from wild birds in the Dongting Lake wetland. Its eight gene segments are generated by reassortment of gene segments of different AIV subtypes. These results are helpful for understanding the epidemiology and evolution of AIV in wild birds during migration. 相似文献
9.
10.
M. Filek J. Biesaga-Kościelniak I. Marcińska M. Cvikrová I. Macháčková J. Krekule 《Biologia Plantarum》2010,54(3):483-487
The contents of endogenous free and conjugated polyamines, putrescine (Put) and spermidine (Spd), were determined during 9
week of vernalization (at 5 °C) in winter wheat seedlings cultivated on Murashige and Skoog media without (MS0) and with 2
mg dm−3 zearalenone (MSZEN). At the 4th week of chilling treatment, which is sufficient to induce generative development in 30 % of plants, the marked increase in
free and conjugated forms of Put and free Spd were observed. The presence of ZEN in medium significantly accelerated the vernalization.
About 20 % of plants treated with ZEN flowered already after 2 weeks and 40 % after 3 weeks of chilling. Significantly higher
content of free Put was determined in roots grown on MSZEN compared with MS0 during the first 5 weeks of vernalization with
maximum at the 4th week. After germination, a marked decrease in free Spd content was observed both in plants grown on MS0 and MSZEN. Application
of ZEN significantly slowed down the Spd decline in leaves and roots during the first and second week of vernalization. The
content of Spd and its conjugates decreased in vernalized plants after 1 week of cultivation at 20 °C. 相似文献