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   10361篇
  免费   585篇
  国内免费   32篇
  10978篇
  2024年   26篇
  2023年   114篇
  2022年   356篇
  2021年   542篇
  2020年   330篇
  2019年   421篇
  2018年   452篇
  2017年   328篇
  2016年   470篇
  2015年   536篇
  2014年   637篇
  2013年   800篇
  2012年   845篇
  2011年   729篇
  2010年   442篇
  2009年   354篇
  2008年   446篇
  2007年   447篇
  2006年   393篇
  2005年   387篇
  2004年   299篇
  2003年   252篇
  2002年   227篇
  2001年   110篇
  2000年   99篇
  1999年   80篇
  1998年   62篇
  1997年   34篇
  1996年   38篇
  1995年   42篇
  1994年   28篇
  1993年   31篇
  1992年   48篇
  1991年   42篇
  1990年   46篇
  1989年   43篇
  1988年   44篇
  1987年   34篇
  1986年   30篇
  1985年   37篇
  1984年   33篇
  1983年   27篇
  1982年   21篇
  1981年   26篇
  1980年   15篇
  1979年   16篇
  1978年   19篇
  1977年   14篇
  1976年   23篇
  1975年   17篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.

Cotton fibre quality is a multigenic trait. Genetic modification of different genes to achieve high quality fibre is difficult without knowing the mechanism lying behind genes interaction. Based on background knowledge an attempt to explore the potential structural interactions between Gossypium hirsutum Wlim5 domain1 and Gossypium hirsutum ACTIN-1 proteins was done in current study. Sequence features of the LIM domain1 of GhWlim5 protein were identified through multiple sequence alignment analysis, and a phylogenetic tree was built to identify evolutionary relationships between sequences. Conservation indicated the evolutionary importance of side chain residues and the presence of several aliphatic and/or bulky residues, which stabilize the protein core and facilitate packing of zinc fingers. The structures of GhWlim5 domain1 and GhACTIN-1 proteins were modelled and validated through computational methods. Validation of GhACTIN-1 and GhWlim5 domain1 structures indicated good structural quality with 99.7% and 100% of the favoured number of residues in allowed regions and Z-score, within the ranges of − 9.87 and − 4.17, respectively. Docking analysis indicated various possible modes of interaction between these two proteins with favourable binding affinities. Based on our strong binding interaction results between GhWlim5 domain1 and GhACTIN-1 proteins, we further investigated the role of over-expression of GhWlim5 by transformation in cotton plants under fibre specific promoter and transgenic plants displayed significant increases in fibre strength.

  相似文献   
93.
Mehrabi  Fatemeh  Shamspur  Tayebeh  Sheibani  Hassan  Mostafavi  Ali  Mohamadi  Maryam  Hakimi  Hamid  Bahramabadi  Reza  Salari  Elham 《Biometals》2021,34(6):1237-1246
BioMetals - Trimethoprim and sulfamethoxazole are prescribed for a broad spectrum of bacteria. However, the use of these medicines is restricted due to the risk of microbial resistance in the body....  相似文献   
94.
95.
Ali  S. G.  Shehwar  D.  Alam  M. R. 《Molecular Biology》2021,55(5):752-762
Molecular Biology - Neutrophils fight with invading pathogens through various mechanisms including degranulation, phagocytosis, and the release of neutrophil extracellular traps (NETs). This study...  相似文献   
96.
97.
International Journal of Peptide Research and Therapeutics - Pseudomonas aeruginosa (P. aeruginosa) is a critical healthcare challenge due to its ability to cause persistent infections and the...  相似文献   
98.
Present study focuses on ameliorative potential of Typha elephantina leave’s aqueous (TE.AQ) extract against Paracetamol (PCM) induced toxicity in rabbits. We fed the male rabbits with 300 mg PCM in alone and in combination with TE.AQ at different doses i.e. (100, 200 and 300 mg/kg body weight) or silymarin (100 mg/kg) daily for 21 days. PCM in alone significantly (P < 0.5) increased serum urea, uric acid, creatinine, total protein, albumin, globulin and blood urea nitrogen. Serum sodium, potassium and magnesium level were high. The glutathione, radical scavenging activity and Thiobarbituric acid reactive substances were significantly reduced. Treatment with TE.AQ at dose rate 300 mg/kg body weight and Silymarin significantly ameliorated all the parameters when compared with PCM administered group. The 100 and 200 mg of TE.AQ showed no significant effects. The histopathological examination confirmed the therapeutic potential of TE.AQ. These results established the presence of natural antioxidants in Typha elephantina leaves.  相似文献   
99.
Journal of Molecular Histology - The morphological and possible functional interactions between the connective tissue and enamel organ cells were examined during the maturation phase of enamel...  相似文献   
100.
Mandi  L.  Ali  R.  Chatterjee  P. 《Plasma Physics Reports》2021,47(5):419-426
Plasma Physics Reports - Quasiperiodic and chaotic features of the dust ion acoustic (DIA) waves in a magnetized dusty plasma is studied. Reductive perturbation technique (RPT) is used to derive...  相似文献   
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