全文获取类型
收费全文 | 14844篇 |
免费 | 1353篇 |
国内免费 | 1632篇 |
专业分类
17829篇 |
出版年
2024年 | 61篇 |
2023年 | 248篇 |
2022年 | 550篇 |
2021年 | 900篇 |
2020年 | 637篇 |
2019年 | 734篇 |
2018年 | 700篇 |
2017年 | 502篇 |
2016年 | 672篇 |
2015年 | 984篇 |
2014年 | 1112篇 |
2013年 | 1250篇 |
2012年 | 1359篇 |
2011年 | 1280篇 |
2010年 | 757篇 |
2009年 | 707篇 |
2008年 | 776篇 |
2007年 | 658篇 |
2006年 | 646篇 |
2005年 | 414篇 |
2004年 | 413篇 |
2003年 | 387篇 |
2002年 | 328篇 |
2001年 | 241篇 |
2000年 | 196篇 |
1999年 | 196篇 |
1998年 | 163篇 |
1997年 | 117篇 |
1996年 | 107篇 |
1995年 | 96篇 |
1994年 | 73篇 |
1993年 | 64篇 |
1992年 | 84篇 |
1991年 | 59篇 |
1990年 | 52篇 |
1989年 | 51篇 |
1988年 | 41篇 |
1987年 | 28篇 |
1986年 | 23篇 |
1985年 | 28篇 |
1984年 | 19篇 |
1983年 | 11篇 |
1982年 | 17篇 |
1981年 | 11篇 |
1980年 | 8篇 |
1979年 | 11篇 |
1978年 | 10篇 |
1977年 | 7篇 |
1975年 | 11篇 |
1973年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
Upadhyay Udita Zhuang Gerald Z. Diatchenko Luda Parisien Marc Kang Yuan Sarantopoulos Konstantinos D. Martin Eden R. Smith Shad B. Maixner William Levitt Roy C. 《Mammalian genome》2020,31(9-12):287-294
Mammalian Genome - Intracellular calcium is critical in orchestrating neuronal excitability and analgesia. Carbonic anhydrase-8 (CA8) regulates intracellular calcium signaling through allosteric... 相似文献
142.
143.
144.
145.
Bin Liang Yu Zheng Juan Wang Wenbo Zhang Ying Fu Wenbin Kai Yandan Xu Bing Yuan Qian Li Ping Leng 《The Plant journal : for cell and molecular biology》2020,102(6):1220-1233
β‐Glucosidases (BG) are present in many plant tissues. Among these, abscisic acid (ABA) β‐glucosidases are thought to take part in the adjustment of cellular ABA levels, however the role of ABA‐BG in fruits is still unclear. In this study, through RNA‐seq analysis of persimmon fruit, 10 full‐length DkBG genes were isolated and were all found to be expressed. In particular, DkBG1 was highly expressed in persimmon fruits with a maximum expression 95 days after full bloom (DAFD). We verified that, in vitro, DkBG1 protein can hydrolyze ABA‐glucose ester (ABA‐GE) to release free ABA. Compared with wild‐type, tomato plants that overexpressed DkBG1 significantly upregulated the expression of ABA receptor PYL3/7 genes and showed typical symptoms of ABA hypersensitivity in fruits. DkBG1 overexpression (DkBG1‐OE) accelerated fruit ripening onset by 3–4 days by increasing ABA levels at the pre‐breaker stage and induced early ethylene release compared with wild‐type fruits. DkBG1‐OE altered the expression of ripening regulator NON‐RIPENING (NOR) and its target genes; this in turn altered fruit quality traits such as coloration. Our results demonstrated that DkBG1 plays an important role in fruit ripening and quality by adjusting ABA levels via hydrolysis of ABA‐GE. 相似文献
146.
147.
Liping Liu Lihua Zhao Piaojuan Chen Hanyang Cai Zhimin Hou Xingyue Jin Mohammad Aslam Mengnan Chai Linyi Lai Qing He Yanhui Liu Xiaoyi Huang Huihuang Chen Yingzhi Chen Yuan Qin 《The Plant journal : for cell and molecular biology》2020,102(6):1172-1186
Angiosperm reproductive development is a complex event that includes floral organ development, male and female gametophyte formation and interaction between the male and female reproductive organs for successful fertilization. Previous studies have revealed the redundant function of ATP binding cassette subfamily G (ABCG) transporters ABCG1 and ABCG16 in pollen development, but whether they are involved in other reproductive processes is unknown. Here we show that ABCG1 and ABCG16 were not only expressed in anthers and stamen filaments but also enriched in pistil tissues, including the stigma, style, transmitting tract and ovule. We further demonstrated that pistil‐expressed ABCG1 and ABCG16 promoted rapid pollen tube growth through their effects on auxin distribution and auxin flow in the pistil. Moreover, disrupted auxin homeostasis in stamen filaments was associated with defective filament elongation. Our work reveals the key functions of ABCG1 and ABCG16 in reproductive development and provides clues for identifying ABCG1 and ABCG16 substrates in Arabidopsis. 相似文献
148.
149.
150.