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   5302篇
  免费   312篇
  国内免费   13篇
耳鼻咽喉   42篇
儿科学   306篇
妇产科学   132篇
基础医学   747篇
口腔科学   64篇
临床医学   369篇
内科学   1054篇
皮肤病学   147篇
神经病学   335篇
特种医学   120篇
外科学   508篇
综合类   246篇
一般理论   5篇
预防医学   453篇
眼科学   147篇
药学   433篇
中国医学   91篇
肿瘤学   428篇
  2023年   38篇
  2022年   30篇
  2021年   174篇
  2020年   93篇
  2019年   123篇
  2018年   150篇
  2017年   119篇
  2016年   145篇
  2015年   156篇
  2014年   218篇
  2013年   272篇
  2012年   418篇
  2011年   381篇
  2010年   224篇
  2009年   183篇
  2008年   284篇
  2007年   249篇
  2006年   246篇
  2005年   240篇
  2004年   215篇
  2003年   219篇
  2002年   154篇
  2001年   106篇
  2000年   98篇
  1999年   79篇
  1998年   37篇
  1997年   32篇
  1996年   35篇
  1995年   21篇
  1994年   29篇
  1993年   26篇
  1992年   65篇
  1991年   61篇
  1990年   50篇
  1989年   49篇
  1988年   45篇
  1987年   31篇
  1986年   45篇
  1985年   41篇
  1984年   22篇
  1983年   26篇
  1979年   29篇
  1977年   21篇
  1975年   23篇
  1974年   20篇
  1973年   31篇
  1972年   36篇
  1971年   23篇
  1970年   27篇
  1968年   26篇
排序方式: 共有5627条查询结果,搜索用时 119 毫秒
1.
Pregnancy can be complicated with different surgical emergencies which may potentially endanger the mother as well as foetus. In the modern era of advanced diagnostics and treatments, neither of them in response to a surgical emergency in a pregnant woman should be delayed. Appropriate early intervention is essential to decrease the morbidity and mortality. Following article encompasses common surgical emergencies that can arise in a pregnant woman and tries to suggest the approach that may be taken to reduce the burden of morbidity and mortality.  相似文献   
2.
Graefe's Archive for Clinical and Experimental Ophthalmology - To evaluate the long-term safety and efficacy of intrastromal bevacizumab for treatment of deep corneal neovascularization in...  相似文献   
3.
1. The present study is designed to investigate the brain distribution and plasma pharmacokinetics profiles of chlorogenic acid (CGA) after intranasal administration in Charles–Foster rats to evaluate whether the CGA molecules are transported directly via the nose-to-brain path.

2. The CGA is administered intravenously (IV) and intranasally (IN) at the dose of 10?mg/kg. Further, its concentration in the plasma, cerebrospinal fluid (CSF) and the whole brain is analyzed by HPLC-UV method.

3. The study observes that CGA is rapidly absorbed in plasma with tmax of 1?min similar to IV route after IN administration. The peak plasma concentration and AUC0–24 are higher by 3.5 and 4.0 times respectively in IV administration, compared to IN delivery that represents the significant less systemic exposure of CGA in IN route.

4. However, the concentration of CGA in the brain is 4, 6.5, 5.3, 5.2 and 4.5 times higher at 30, 60, 120, 240 and 360?min, respectively in IN administration compared to IV administration. The exposure of CGA in the brain after IN administration (AUCbrain, IN) was significantly greater (4 times) as compared to the exposure of CGA in the brain (AUCbrain, IV) after IV administration reflecting significant brain uptake of CGA through nasal route. Therefore, IN delivery of CGA can be a promising approach for the treatment of stroke and neurodegenerative disorders.  相似文献   

4.
5.
Studies on the development of imaging agents for targeting neuroreceptors is an area of considerable interest owing to the limited availability of specific as well as selective radiolabeled agents. Therefore, with an aim of developing a receptor-specific agent, iminodiacetic acid (IDA) derivative of 5-hydroxy tryptamine viz., HTIDA has been synthesized. HTIDA could be radiolabeled with the synthon [(99m)Tc(CO)(3)(H(2)O)(3)](+) in >98% yield. The biodistribution studies in normal Swiss mice showed that the (99m)Tc(CO)(3)-HTIDA crosses the blood-brain barrier successfully with a brain uptake of 0.5%ID/g at 5min post injection. The other relevant observations from biodistribution studies included no significant uptake in any other organ and fast clearance from blood, lungs and liver.  相似文献   
6.
7.
Infections caused by extended-spectrum beta-lactamase (ESBL)-producing pathogens, particularly Klebsiella pneumoniae, are increasing. The epidemiology of ESBL-producing K. pneumoniae, the mechanisms of resistance, and treatment strategies for infections caused by these organisms are reviewed.  相似文献   
8.
Awareness among the general population of the risk factors and warning symptoms of stroke is essential for preventative purposes and for immediate effective treatment. The aim of the present study was to assess the awareness, among the general population and stroke survivors, of the risk factors and warning symptoms of stroke, to develop an educational strategy for its prevention and immediate effective treatment. Six hundred and sixty stroke patients (370 male, 290 female) and 4000 people from the general population who accompanied the patients (2800 male, 1200 female) were interviewed, using three sets of questionnaires, on the risk factors and warning symptoms of stroke. Poor knowledge or awareness of the risk factors and warning symptoms of stroke was found in both groups. Both groups suggested educational programs for stroke using printed information, audiovisual programs and community survey programs using simple and understandable information for the prevention and immediate effective treatment of stroke. Poor awareness of stroke contributes to a delay in the arrival of patients in hospital emergency departments for immediate effective treatment. Multifaceted programs regarding stroke, including printed information, audiovisual programs and stroke service programs, are advocated by both patients and the general population to improve stoke treatment and prevention.  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