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   326054篇
  免费   12278篇
  国内免费   1126篇
耳鼻咽喉   4036篇
儿科学   11640篇
妇产科学   8948篇
基础医学   44297篇
口腔科学   10804篇
临床医学   28500篇
内科学   63264篇
皮肤病学   7714篇
神经病学   24674篇
特种医学   13699篇
外国民族医学   98篇
外科学   40803篇
综合类   1648篇
一般理论   74篇
预防医学   29733篇
眼科学   6585篇
药学   22765篇
  3篇
中国医学   653篇
肿瘤学   19520篇
  2023年   1245篇
  2022年   1969篇
  2021年   4689篇
  2020年   3014篇
  2019年   3972篇
  2018年   7861篇
  2017年   7074篇
  2016年   6910篇
  2015年   8819篇
  2014年   9537篇
  2013年   10714篇
  2012年   20613篇
  2011年   16335篇
  2010年   8420篇
  2009年   9102篇
  2008年   11261篇
  2007年   11968篇
  2006年   11603篇
  2005年   18964篇
  2004年   19646篇
  2003年   14556篇
  2002年   9193篇
  2001年   5158篇
  2000年   2294篇
  1999年   6650篇
  1998年   1544篇
  1992年   7224篇
  1991年   7389篇
  1990年   7620篇
  1989年   7212篇
  1988年   6688篇
  1987年   6428篇
  1986年   6163篇
  1985年   5400篇
  1984年   3791篇
  1983年   3116篇
  1979年   3941篇
  1978年   2463篇
  1977年   1882篇
  1976年   1645篇
  1975年   2543篇
  1974年   3184篇
  1973年   2797篇
  1972年   2801篇
  1971年   2784篇
  1970年   2593篇
  1969年   2492篇
  1968年   2261篇
  1967年   2182篇
  1966年   1916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.

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 We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL,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   
4.
5.
6.
Breast pseudoaneurysms after a core needle biopsy are a rare complication with a low incidence. However, it is important to be aware of the possibility of complications that require treatment.  相似文献   
7.
8.
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   
9.
10.
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