首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   18938篇
  免费   1707篇
  国内免费   1472篇
  22117篇
  2023年   243篇
  2022年   532篇
  2021年   895篇
  2020年   607篇
  2019年   689篇
  2018年   731篇
  2017年   542篇
  2016年   711篇
  2015年   1152篇
  2014年   1275篇
  2013年   1373篇
  2012年   1571篇
  2011年   1512篇
  2010年   991篇
  2009年   843篇
  2008年   915篇
  2007年   886篇
  2006年   780篇
  2005年   661篇
  2004年   623篇
  2003年   550篇
  2002年   522篇
  2001年   396篇
  2000年   392篇
  1999年   362篇
  1998年   171篇
  1997年   161篇
  1996年   158篇
  1995年   119篇
  1994年   146篇
  1993年   90篇
  1992年   156篇
  1991年   147篇
  1990年   122篇
  1989年   98篇
  1988年   82篇
  1987年   96篇
  1986年   83篇
  1985年   92篇
  1984年   48篇
  1983年   48篇
  1982年   48篇
  1981年   36篇
  1980年   37篇
  1979年   52篇
  1978年   41篇
  1977年   45篇
  1976年   33篇
  1975年   35篇
  1974年   44篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
Freestanding layered membrane–based devices have broad applications in highly efficient energy‐storage/conversion systems. The liquid–solid interface is considered as a unique yet versatile interface for constructing such layered membrane–based devices. In this review, the authors outline recent developments in the fabrication of soft materials to functionalize layered devices from the aspect of liquid–solid interfacial assembly and engineering arts. Seven liquid–solid interfacial assembly strategies, including flow‐directed, superlattice, solvent‐casting, evaporation‐induced, dip‐coating, spinning, and electrospinning assemblies, are comprehensively highlighted with a focus on their synthetic pathways, formation mechanisms, and interface engineering strategies. Meanwhile, recent representative works on layered membrane–based devices for electrochemical energy applications are presented. Finally, challenges and opportunities of this research area are highlighted in order to stimulate future developments. This review not only offers comprehensive and practical approaches to assemble liquid–solid interfaces with soft materials for various important layered electrochemical energy devices but also sheds lights on fundamental insights by thoughtful discussions on performance enhancement mechanisms of these electrochemical energy systems.  相似文献   
962.
963.
Zhang  Cheng  Wu  Qiong  Huang  Huang  Chen  Xixi  Huang  Tianmiao  Li  Wenli  Liu  Yubo  Zhang  Jianing 《Journal of physiology and biochemistry》2019,75(4):549-559
Journal of Physiology and Biochemistry - Caveolin-1 (Cav-1) is a critical structural protein of caveolae and plays an oncogene-like role by participating in abnormal protein glycosylation in...  相似文献   
964.
965.
Herein we report our efforts of developing reversible selective hMAO-B inhibitors based on isatin, a fragment in an X-ray crystal structure. Five different scaffolds were designed and many compounds were synthesized. Among them, compound A3 demonstrated very high potency and isoform selectivity against hMAO-B, 11 and 13 times more potent (IC50?=?3?nM) and 23.64 and 6.8 times more selective than the marked drugs, selegiline and safinamide. However, the endeavors to modify the polar 3-one group of isatin, that is in a hydrophobic environment in the binding site of hMAO-B, to small nonpolar hydrophobic groups did not bring about improved hMAO-B inhibitors, which may challenge our understanding of molecular interactions and molecular recognition in biological systems.  相似文献   
966.
967.
968.
Cell‐, tissue‐ or organ‐specific inducible expression systems are powerful tools for functional analysis of changes to the pattern, level or timing of gene expression. However, plant researchers lack standardised reagents that promote reproducibility across the community. Here, we report the development and functional testing of a Gateway‐based system for quantitatively, spatially and temporally controlling inducible gene expression in Arabidopsis that overcomes several drawbacks of the legacy systems. We used this modular driver/effector system with intrinsic reporting of spatio‐temporal promoter activity to generate 18 well‐characterised homozygous transformed lines showing the expected expression patterns specific for the major cell types of the Arabidopsis root; seed and plasmid vectors are available through the Arabidopsis stock centre. The system's tight regulation was validated by assessing the effects of diphtheria toxin A chain expression. We assessed the utility of Production of Anthocyanin Pigment 1 (PAP1) as an encoded effector mediating cell‐autonomous marks. With this shared resource of characterised reference driver lines, which can be expanded with additional promoters and the use of other fluorescent proteins, we aim to contribute towards enhancing reproducibility of qualitative and quantitative analyses.  相似文献   
969.
970.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号