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   70410篇
  免费   4501篇
  国内免费   365篇
耳鼻咽喉   701篇
儿科学   1494篇
妇产科学   1171篇
基础医学   9811篇
口腔科学   1392篇
临床医学   6913篇
内科学   16250篇
皮肤病学   1534篇
神经病学   7941篇
特种医学   2945篇
外科学   10130篇
综合类   377篇
一般理论   24篇
预防医学   3910篇
眼科学   1076篇
药学   4425篇
中国医学   123篇
肿瘤学   5059篇
  2024年   68篇
  2023年   704篇
  2022年   1296篇
  2021年   2373篇
  2020年   1326篇
  2019年   2020篇
  2018年   2218篇
  2017年   1719篇
  2016年   2022篇
  2015年   2284篇
  2014年   2967篇
  2013年   3575篇
  2012年   5664篇
  2011年   5761篇
  2010年   3350篇
  2009年   3016篇
  2008年   4771篇
  2007年   4877篇
  2006年   4512篇
  2005年   4364篇
  2004年   3817篇
  2003年   3619篇
  2002年   3203篇
  2001年   523篇
  2000年   384篇
  1999年   508篇
  1998年   624篇
  1997年   469篇
  1996年   371篇
  1995年   297篇
  1994年   266篇
  1993年   213篇
  1992年   173篇
  1991年   153篇
  1990年   117篇
  1989年   112篇
  1988年   111篇
  1987年   78篇
  1986年   89篇
  1985年   83篇
  1984年   111篇
  1983年   94篇
  1982年   88篇
  1981年   73篇
  1980年   70篇
  1978年   54篇
  1977年   56篇
  1976年   50篇
  1975年   55篇
  1974年   53篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.

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 We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL,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   
5.
6.
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The...  相似文献   
7.
8.
The present study aimed at measuring seropositivities for infection by Ascaris suum and Toxocara canis using the excretory/secretory (E/S) antigens from Ascaris suum (AES) and Toxocara canis (TES) within an indigenous population. In addition, quantification of cytokine expressions in peripheral blood cells was determined. A total of 50 Warao indigenous were included; of which 43 were adults and seven children. In adults, 44.1% were seropositive for both parasites; whereas children had only seropositivity to one or the other helminth. For ascariosis, the percentage of AES seropositivity in adults and children was high; 23.3% and 57.1%, respectively. While that for toxocariosis, the percentage of TES seropositivity in adults and children was low; 9.3% and 14.3%, respectively. The percentage of seronegativity was comparable for AES and TES antigens in adults (27.9%) and children (28.6%). When positive sera were analyzed by Western blotting technique using AES antigens; three bands of 97.2, 193.6 and 200.2 kDas were mostly recognized. When the TES antigens were used, nine major bands were mostly identified; 47.4, 52.2, 84.9, 98.2, 119.1, 131.3, 175.6, 184.4 and 193.6 kDas. Stool examinations showed that Blastocystis hominis, Hymenolepis nana and Entamoeba coli were the most commonly observed intestinal parasites. Quantification of cytokines IFN-γ, IL-2, IL-6, TGF-β, TNF-α, IL-10 and IL-4 expressions showed that there was only a significant increased expression of IL-4 in indigenous with TES seropositivity (p < 0.002). Ascaris and Toxocara seropositivity was prevalent among Warao indigenous.  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