全文获取类型
收费全文 | 22101篇 |
免费 | 1969篇 |
国内免费 | 2570篇 |
出版年
2024年 | 46篇 |
2023年 | 192篇 |
2022年 | 504篇 |
2021年 | 882篇 |
2020年 | 758篇 |
2019年 | 897篇 |
2018年 | 857篇 |
2017年 | 701篇 |
2016年 | 828篇 |
2015年 | 1293篇 |
2014年 | 1634篇 |
2013年 | 1765篇 |
2012年 | 2115篇 |
2011年 | 1965篇 |
2010年 | 1313篇 |
2009年 | 1163篇 |
2008年 | 1530篇 |
2007年 | 1290篇 |
2006年 | 1194篇 |
2005年 | 992篇 |
2004年 | 980篇 |
2003年 | 904篇 |
2002年 | 811篇 |
2001年 | 366篇 |
2000年 | 263篇 |
1999年 | 215篇 |
1998年 | 218篇 |
1997年 | 132篇 |
1996年 | 129篇 |
1995年 | 130篇 |
1994年 | 94篇 |
1993年 | 77篇 |
1992年 | 64篇 |
1991年 | 46篇 |
1990年 | 31篇 |
1989年 | 44篇 |
1988年 | 28篇 |
1987年 | 27篇 |
1986年 | 28篇 |
1985年 | 25篇 |
1984年 | 7篇 |
1983年 | 10篇 |
1982年 | 18篇 |
1981年 | 5篇 |
1977年 | 5篇 |
1969年 | 4篇 |
1967年 | 4篇 |
1965年 | 4篇 |
1963年 | 3篇 |
1962年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
891.
Shoichiro Horita Michihiko Kataoka Nahoko Kitamura Takuya Miyakawa Jun Ohtsuka Yuko Maejima 《Bioscience, biotechnology, and biochemistry》2019,83(3):456-462
Old yellow enzymes (OYEs) are potential targets of protein engineering for useful biocatalysts because of their excellent asymmetric reductions of enone compounds. Two OYEs from different yeast strains, Candida macedoniensis AKU4588 OYE (CmOYE) and Pichia sp. AKU4542 OYE (PsOYE), have a sequence identity of 46%, but show different substrate preferences; PsOYE shows 3.4-fold and 39-fold higher catalytic activities than CmOYE toward ketoisophorone and (4S)-phorenol, respectively. To gain insights into structural basis of their different substrate preferences, we have solved a crystal structure of PsOYE, and compared its catalytic site structure with that of CmOYE, revealing the catalytic pocket of PsOYE is wider than that of CmOYE due to different positions of Phe246 (PsOYE)/Phe250 (CmOYE) in static Loop 5. This study shows a significance of 3D structural information to explain the different substrate preferences of yeast OYEs which cannot be understood from their amino acid sequences.
Abbreviations: OYE: Old yellow enzymes, CmOYE: Candida macedoniensis AKU4588 OYE, PsOYE: Pichia sp. AKU4542 OYE 相似文献
892.
893.
894.
Pengju Zhang Jun Wang Hongyan Lang Weixia Wang Xiaohui Liu Haiyan Liu Chengcheng Tan Xintao Li Yumin Zhao Xinghong Wu 《Journal of cellular biochemistry》2019,120(5):8466-8474
MicroRNA-205 (miR-205) is involved in various physiological and pathological processes, but its biological function in follicular atresia remains unclear. In this study, we investigated miR-205 expression in mouse granulosa cells (mGCs) and analyzed its functions in primary mGCs by performing a series of in vitro experiments. Quantitative real-time polymerase chain reaction showed that miR-205 expression was significantly higher in early atretic follicles and progressively atretic follicles than in healthy follicles. miR-205 overexpression in mGCs significantly promoted apoptosis and caspase-3/9 activities, as well as inhibited estrogen (E2) release and cytochrome P450 family 19 subfamily A polypeptide 1 (CYP19A1, a key gene in E2 production) expression. Bioinformatics and luciferase reporter assays revealed that the gene encoding cyclic AMP response element (CRE)-binding protein 1 (CREB1) was a direct target of miR-205 in mGCs. CREB1 upregulation partially rescued the effects of miR-205 on apoptosis, caspase-3/9 activities, E2 production, and CYP19A1 expression on mGCs. These results indicate that miR-205 might play an important role in ovarian follicular development and provide new insights into follicular atresia 相似文献
895.
896.
897.
898.
899.
900.
Lijie Zhu Jun Wang Chuang Yue Wei Yuan Wei Zhang Li Shi Yuanyuan Mi Xingyu Wu Li-Feng Zhang Li Zuo 《Journal of cellular biochemistry》2019,120(10):18346-18356
Association between CDKN1B gene Val 109 Gly polymorphism and prostate cancer (PCa) susceptibility has been investigated in several studies but with inconsistent conclusions. We adopted odds ratios (ORs) and 95% confidence intervals (CIs) to assess the correlation between CDKN1B Val 109 Gly variant and PCa susceptibility. Moreover, we used in-silico tools to evaluate the relationship of CDKN1B expression and overall survival (OS) or disease free survival (DFS) time in PCa patients. The overall results demonstrated no association of the CDKN1B variant on PCa risk [allelic contrast (OR = 0.78, 95% CI = 0.45 − 1.35, Pheterogeneity = 0.038); GV vs VV (OR = 0.83, 95% CI = 0.56 − 1.25, Pheterogeneity = 0.253); GG vs VV (OR = 0.48, 95% CI = 0.23 − 1.01, Pheterogeneity = 0.161); GG+GV vs VV (OR = 0.75, 95% CI = 0.52 −1.08, Pheterogeneity = 0.132) and GG vs GV+VV (OR = 0.63, 95% CI = 0.25 − 1.11, Pheterogeneity = 0.152)]. In subgroup analysis by ethnicity and source of control, we also identified similar results. In-silico results showed that expression of CDKN1B was decreased in PCa tissue, especially in less advanced PCa (Gleason score = 6 or 7). No significant difference of OS or DFS time was indicated between the low and high expression of CDKN1B. Our present study showed evidence that CDKN1B Val 109 Gly variant is not related to PCa risk. Future studies with large sample size are needed to confirm this correlation in more details. 相似文献