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   6555篇
  免费   436篇
  国内免费   13篇
  2023年   76篇
  2022年   177篇
  2021年   389篇
  2020年   150篇
  2019年   185篇
  2018年   277篇
  2017年   189篇
  2016年   262篇
  2015年   403篇
  2014年   391篇
  2013年   491篇
  2012年   486篇
  2011年   469篇
  2010年   283篇
  2009年   235篇
  2008年   275篇
  2007年   288篇
  2006年   229篇
  2005年   180篇
  2004年   176篇
  2003年   138篇
  2002年   136篇
  2001年   94篇
  2000年   70篇
  1999年   54篇
  1998年   39篇
  1997年   34篇
  1996年   28篇
  1995年   29篇
  1994年   24篇
  1993年   24篇
  1992年   54篇
  1991年   39篇
  1990年   50篇
  1989年   47篇
  1988年   37篇
  1987年   30篇
  1986年   34篇
  1985年   29篇
  1984年   38篇
  1983年   33篇
  1982年   32篇
  1981年   34篇
  1980年   40篇
  1979年   18篇
  1978年   27篇
  1977年   19篇
  1975年   16篇
  1974年   22篇
  1973年   20篇
排序方式: 共有7004条查询结果,搜索用时 0 毫秒
151.
152.
153.
Acetaminophen (APAP) overdose leads to liver injury. NLRP3 inflammasome is a key player in APAP‐induced inflammation. Also, apoptosis and liver regeneration play an important role in liver injury. Therefore, we assessed allicin's protective effect on APAP‐induced hepatotoxicity and studied its effect on NLRP3 inflammasome and apoptosis. Mice in the APAP group were injected by APAP (250 mg/kg, intraperitoneal). The allicin‐treated group received allicin orally (10 mg/kg/d) during 7 days before APAP injection. Serum and hepatic tissues were separated 24 hours after APAP injection. Serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), albumin, alkaline phosphatase (ALP), and hepatic malondialdehyde (MDA) were assessed using the colorimetric method. Hepatic NLRP3 inflammasome, caspase‐1, and interleukin‐1β (IL‐1β) were estimated using enzyme‐linked immunosorbent assay. Hepatic Bcl‐2 and Ki‐67 were investigated by immunohistochemistry. APAP significantly increased AST, ALT, and ALP, whereas allicin significantly decreased their levels. Also, APAP significantly decreased albumin and allicin significantly improved it. APAP produced changes in liver morphology, including inflammation and massive coagulative necrosis. Allicin protected the liver from APAP‐induced necrosis, apoptosis, and hepatocellular degeneration via increasing Bcl‐2 and Ki‐67 levels. APAP significantly increased the hepatic MDA, whereas allicin significantly prevented this increase. APAP markedly activated the NLRP3 inflammasome pathway and consequently increased the production of caspase‐1 and IL‐1β. Interestingly, we found that allicin significantly inhibited NLRP3 inflammasome activation, which resulted in decreased caspase‐1 and IL‐1β levels. Allicin has a hepatoprotective effect against APAP‐induced liver injury via the decline of oxidative stress and inhibition of the inflammasome pathway and apoptosis. Therefore, allicin might be a novel tool to halt the progression of APAP‐stimulated hepatotoxicity.  相似文献   
154.
155.
Russian Journal of Bioorganic Chemistry - An effective method for synthesizing a series of fifteen new compounds ethyl 3-(2-(3-amino-1,4-dihydroquinoxaline-2-carbonyl)hydrazono )butanoate (II),...  相似文献   
156.
The molecular phylogenetic relationship among two species of genus Leiurus, from Saudi Arabia with additional comparative sequence data available from Egypt, Oman and Turkey is presented. The molecular phylogeny was performed using maximum parsimony, neighbor joining and bayesian inference. Our results indicate a clear deep splitting between the Western clade, which represented by L. quinuestriatus sequences from Egypt and those from the Eastern clade which encompassing different Leiurus species from Saudi Arabia, Oman and Turkey was shown. Also, the phylogenetic relationship represents additional support for the taxonomic status of Arabian Leiurus species.  相似文献   
157.
As an ancient clonal root and leaf crop, taro (Colocasia esculenta, Araceae) is highly polymorphic with uncertain genetic and geographic origins. We explored chloroplast DNA diversity in cultivated and wild taros, and closely related wild taxa, and found cultivated taro to be polyphyletic, with tropical and temperate clades that appear to originate in Southeast Asia sensu lato. A third clade was found exclusively in wild populations from Southeast Asia to Australia and Papua New Guinea. Our findings do not support the hypothesis of taro domestication in Papua New Guinea, despite archaeological evidence for early use or cultivation there, and the presence of apparently natural wild populations in the region (Australia and Papua New Guinea).  相似文献   
158.
Plant Cell, Tissue and Organ Culture (PCTOC) - Date palm (Phoenix dactylifera L.) micropropagation still faces many problems, such as reduced growth and development of callus, low multiplication...  相似文献   
159.
160.
Experimental and Applied Acarology - This study examined the acaricidal, histopathological and genotoxic effects of the entomopathogenic fungus Beauveria bassiana on engorged females of the fowl...  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