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   1278667篇
  免费   92925篇
  国内免费   1993篇
耳鼻咽喉   18201篇
儿科学   42313篇
妇产科学   37863篇
基础医学   187293篇
口腔科学   35418篇
临床医学   108344篇
内科学   251936篇
皮肤病学   26509篇
神经病学   99371篇
特种医学   50040篇
外国民族医学   366篇
外科学   197781篇
综合类   26548篇
现状与发展   1篇
一般理论   301篇
预防医学   92954篇
眼科学   29099篇
药学   97910篇
  1篇
中国医学   2496篇
肿瘤学   68840篇
  2018年   11834篇
  2015年   11648篇
  2014年   16057篇
  2013年   24418篇
  2012年   33635篇
  2011年   36034篇
  2010年   21267篇
  2009年   20076篇
  2008年   35082篇
  2007年   38058篇
  2006年   38603篇
  2005年   37881篇
  2004年   36464篇
  2003年   35463篇
  2002年   34998篇
  2001年   58176篇
  2000年   59663篇
  1999年   50757篇
  1998年   14251篇
  1997年   12830篇
  1996年   13095篇
  1995年   12364篇
  1994年   11780篇
  1993年   10879篇
  1992年   41047篇
  1991年   40408篇
  1990年   39942篇
  1989年   38744篇
  1988年   36155篇
  1987年   35374篇
  1986年   33753篇
  1985年   32162篇
  1984年   23953篇
  1983年   20846篇
  1982年   12387篇
  1981年   10941篇
  1980年   10222篇
  1979年   22652篇
  1978年   15893篇
  1977年   13740篇
  1976年   12987篇
  1975年   14210篇
  1974年   16699篇
  1973年   16086篇
  1972年   15331篇
  1971年   14233篇
  1970年   13222篇
  1969年   12739篇
  1968年   11987篇
  1967年   10485篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
A true comparison of long-term medical and surgical treatment in gastro-oesophageal reflux disease (GORD) is impossible as few studies have been carried out with adequate randomisation of the patients and long-term evaluation of quality of life. In general the control of the reflux symptoms is roughly equal with medical and surgical treatment. However, surgery can cause other symptoms such as dysphagia or non-specific epigastric discomfort or pain in some patients, which reduces the overall efficacy in controlling the symptoms. Based on a cost utility analysis, Heudebert et al. came to the conclusion that medical treatment was their preferred strategy for most patients with severe erosive oesophagitis.  相似文献   
63.
64.
The prevalence of heavy alcohol consumption is a major problem of increasing proportions throughout the world. Although alcohol sensitizing drugs and more recently serotonin uptake inhibitors are drug interventions with some following, their long term beneficial consequences have yet to be demonstrated. In recent years, we have demonstrated that manipulating activity in the renin-angiotensin system will dramatically alter voluntary alcohol consumption in rats. Based on these findings, the present study evaluated the ability of a class of drugs known as the angiotensin converting enzyme inhibitors to reduce voluntary alcohol drinking in laboratory animals. These drugs prevent the conversion of angiotensin I to angiotensin II. They have been licensed for use in Europe and North America and are indicated in the treatment of hypertension. Our experiments showed that both captopril (Capoten, Squibb) and enalapril (Vasotec, Merck Sharpe & Dohme) can reduce alcohol drinking in both normotensive and hypertensive animals regardless of whether the pattern of intake is in a bout or of a less exaggerated nature. Furthermore, this change in alcohol intake can occur without concomitant changes in blood pressure, plasma renin activity, overall fluid balance, or the distribution and metabolism of alcohol. Taken together these findings suggest that the angiotensin converting enzyme inhibitors should be evaluated in a clinical setting for they may prove to be a useful new treatment or treatment adjunct for alcohol abuse in humans.  相似文献   
65.
66.
67.
68.
69.
Concanavalin A-induced lymphocyte proliferation was studied in 25 patients with alcoholic hepatitis or compensated alcoholic cirrhosis. Nine alcoholics without evidence of liver disease were also evaluated. A nonlinear correlation equation, which was natural logarithmic, was applied to individual dose-response proliferation curves and permitted comparisons between patient groups and controls. The proliferative response in all patient groups was significantly lower when compared to healthy controls and was independent of the presence or absence of liver disease. This suggests that some changes in immune function observed in alcoholics may be linked to the direct effects of alcohol on the immune system rather than to the associated liver disease.  相似文献   
70.
Macrophage NRAMP1 and its role in resistance to microbial infections   总被引:12,自引:0,他引:12  
  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