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   183803篇
  免费   10064篇
  国内免费   950篇
耳鼻咽喉   2048篇
儿科学   5588篇
妇产科学   4412篇
基础医学   25578篇
口腔科学   6516篇
临床医学   15220篇
内科学   43252篇
皮肤病学   4322篇
神经病学   17203篇
特种医学   4895篇
外国民族医学   7篇
外科学   18868篇
综合类   814篇
一般理论   74篇
预防医学   18373篇
眼科学   2997篇
药学   12614篇
中国医学   689篇
肿瘤学   11347篇
  2023年   1498篇
  2022年   3117篇
  2021年   5724篇
  2020年   3371篇
  2019年   4851篇
  2018年   7202篇
  2017年   4950篇
  2016年   4781篇
  2015年   5162篇
  2014年   6933篇
  2013年   9102篇
  2012年   13854篇
  2011年   14533篇
  2010年   7954篇
  2009年   6702篇
  2008年   11683篇
  2007年   11830篇
  2006年   10928篇
  2005年   10488篇
  2004年   9479篇
  2003年   8695篇
  2002年   7913篇
  2001年   2482篇
  2000年   2446篇
  1999年   2259篇
  1998年   1391篇
  1997年   1049篇
  1996年   941篇
  1995年   796篇
  1994年   713篇
  1993年   635篇
  1992年   1146篇
  1991年   883篇
  1990年   861篇
  1989年   751篇
  1988年   679篇
  1987年   662篇
  1986年   611篇
  1985年   514篇
  1984年   425篇
  1983年   378篇
  1982年   302篇
  1981年   235篇
  1980年   249篇
  1979年   292篇
  1978年   253篇
  1977年   228篇
  1976年   215篇
  1975年   226篇
  1974年   241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 We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL,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