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   370772篇
  免费   20739篇
  国内免费   1232篇
耳鼻咽喉   4767篇
儿科学   11890篇
妇产科学   8211篇
基础医学   51688篇
口腔科学   13486篇
临床医学   27715篇
内科学   85457篇
皮肤病学   10117篇
神经病学   32458篇
特种医学   10227篇
外国民族医学   29篇
外科学   43347篇
综合类   2308篇
现状与发展   1篇
一般理论   139篇
预防医学   36300篇
眼科学   7364篇
药学   24343篇
中国医学   1502篇
肿瘤学   21394篇
  2023年   2226篇
  2022年   3443篇
  2021年   8910篇
  2020年   5459篇
  2019年   8495篇
  2018年   11976篇
  2017年   8311篇
  2016年   8294篇
  2015年   9275篇
  2014年   11987篇
  2013年   16221篇
  2012年   25855篇
  2011年   26899篇
  2010年   14095篇
  2009年   11785篇
  2008年   21476篇
  2007年   22520篇
  2006年   20946篇
  2005年   20864篇
  2004年   19173篇
  2003年   17659篇
  2002年   15003篇
  2001年   8982篇
  2000年   9383篇
  1999年   7897篇
  1998年   2763篇
  1997年   2188篇
  1996年   2069篇
  1995年   1740篇
  1994年   1657篇
  1993年   1476篇
  1992年   4120篇
  1991年   3730篇
  1990年   3409篇
  1989年   3227篇
  1988年   2891篇
  1987年   2684篇
  1986年   2574篇
  1985年   2350篇
  1984年   1757篇
  1983年   1411篇
  1982年   856篇
  1979年   1322篇
  1978年   883篇
  1975年   838篇
  1974年   905篇
  1973年   922篇
  1972年   765篇
  1970年   766篇
  1969年   766篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Journal of Medical Ultrasonics - Chronic liver disease is still a major problem because disease progression will ultimately lead to liver cirrhosis. Portal hypertension is the hallmark in advanced...  相似文献   
2.
3.
4.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
5.

Background

Hyperglycaemia is common in patients with acute brain injury admitted to an intensive care unit (ICU). Many studies have found associations between development of hyperglycaemia and increased mortality in hospitalised patients. However, the optimal target for blood glucose control is unknown. We want to conduct a systematic review with meta-analysis and trial sequential analysis to explore the beneficial and harmful effects of restrictive versus liberal glucose control on patient outcomes in adults with severe acute brain injury.

Methods

We will systematically search medical databases including CENTRAL, Embase, MEDLINE and trial registries. We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL, PubMed, EMBASE, Science Citation Index Expanded and CINAHL. Two authors will independently review and select trials and extract data. We will include randomised trials comparing levels of glucose control in our analyses and observational studies will be included to address potential harms. The primary outcomes are defined as all-cause mortality, functional outcome and health-related quality of life. Secondary outcomes include serious adverse events including hypoglycaemia, length of ICU stay and duration of mechanical ventilation, and explorative outcomes including intracranial pressure and infection. Trial Sequential Analysis will be used to investigate the risk of type I error due to repetitive testing and to further explore imprecision. Quality of trials will be evaluated using the Cochrane Risk of Bias tool, and quality of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.

Discussion

The results of the systematic review will be disseminated through peer-reviewed publication. With the review, we hope to inform future randomised clinical trials and improve clinical practice.  相似文献   
6.
7.
8.
9.
10.
The regulation of food intake is a complex mechanism, and the hypothalamus is the main central structure implicated. In particular, the arcuate nucleus appears to be the most critical area in the integration of multiple peripheral signals.Among these signals, those originating from the white adipose tissue and the gastrointestinal tract are known to be involved in the regulation of food intake.The present paper focuses on adiponectin, an adipokine secreted by white adipose tissue, which is reported to have a role in the control of feeding by acting centrally. The recent observation that adiponectin is also able to influence gastric motility raises the question of whether this action represents an additional peripheral mechanism that concurs with the central effects of the hormone on food intake. This possibility, which represents an emerging aspect correlating the central and peripheral effects of adiponectin in the hunger-satiety cycle, is discussed in the present paper.  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