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   175315篇
  免费   9791篇
  国内免费   1024篇
耳鼻咽喉   1965篇
儿科学   5311篇
妇产科学   4030篇
基础医学   24730篇
口腔科学   5662篇
临床医学   14728篇
内科学   40606篇
皮肤病学   4473篇
神经病学   16613篇
特种医学   4872篇
外国民族医学   7篇
外科学   18248篇
综合类   780篇
一般理论   68篇
预防医学   16920篇
眼科学   3013篇
药学   12173篇
中国医学   720篇
肿瘤学   11211篇
  2023年   1303篇
  2022年   2554篇
  2021年   5605篇
  2020年   3302篇
  2019年   4681篇
  2018年   6851篇
  2017年   4803篇
  2016年   4703篇
  2015年   5140篇
  2014年   6853篇
  2013年   8977篇
  2012年   13554篇
  2011年   14035篇
  2010年   7814篇
  2009年   6654篇
  2008年   11288篇
  2007年   11259篇
  2006年   10451篇
  2005年   10002篇
  2004年   9032篇
  2003年   8192篇
  2002年   7513篇
  2001年   2167篇
  2000年   2073篇
  1999年   2008篇
  1998年   1340篇
  1997年   1013篇
  1996年   888篇
  1995年   758篇
  1994年   702篇
  1993年   608篇
  1992年   971篇
  1991年   761篇
  1990年   731篇
  1989年   651篇
  1988年   603篇
  1987年   579篇
  1986年   543篇
  1985年   445篇
  1984年   382篇
  1983年   331篇
  1982年   278篇
  1981年   221篇
  1980年   232篇
  1979年   259篇
  1978年   241篇
  1977年   207篇
  1976年   194篇
  1974年   203篇
  1973年   190篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
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   
3.
International Journal of Clinical Oncology - Immune-checkpoint inhibitors (ICIs) are standard treatments for metastatic non-small cell lung cancer (NSCLC). Patients with poor performance status...  相似文献   
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 We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL,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.
7.
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   
8.
Introduction: The treatment of classical Hodgkin lymphoma (cHL) in children is a story of success. Nowadays, more than 90% of patients are cured and overall survival is nearly 100% at 5 years. Efforts have been made to avoid related effects of therapies; therefore, children are treated using different chemotherapy schemes in comparison with adults.

Areas covered: This review includes a view of the clinical classification and risk assessment in children suffering from HL. The chemotherapy more commonly employed is revisited. The use of PET/CT to evaluate the disease in order to guide therapy is analyzed. New options of chemotherapy and emerging immunotherapy are also included.

Expert opinion: In order to make the right treatment choice, a proper initial assessment of risk is mandatory. The choice of therapy in these kinds of patients must be done according to the experience of the team, and also, the cost and logistics related to the eligible scheme are very important. If possible, efforts must be made to include PET/CT in guiding therapy and avoiding overtreatment and long-term adverse effects in children. New options in immunotherapy are emerging and must be considered with caution in selected patients.  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