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   5746篇
  免费   501篇
  国内免费   54篇
耳鼻咽喉   43篇
儿科学   256篇
妇产科学   161篇
基础医学   744篇
口腔科学   106篇
临床医学   609篇
内科学   1096篇
皮肤病学   130篇
神经病学   410篇
特种医学   367篇
外科学   787篇
综合类   288篇
一般理论   3篇
预防医学   527篇
眼科学   84篇
药学   375篇
  2篇
中国医学   38篇
肿瘤学   275篇
  2022年   57篇
  2021年   93篇
  2020年   51篇
  2019年   76篇
  2018年   91篇
  2017年   92篇
  2016年   68篇
  2015年   99篇
  2014年   144篇
  2013年   195篇
  2012年   298篇
  2011年   288篇
  2010年   203篇
  2009年   208篇
  2008年   227篇
  2007年   282篇
  2006年   269篇
  2005年   198篇
  2004年   216篇
  2003年   198篇
  2002年   188篇
  2001年   150篇
  2000年   100篇
  1999年   149篇
  1998年   118篇
  1997年   108篇
  1996年   111篇
  1995年   93篇
  1994年   79篇
  1993年   76篇
  1992年   82篇
  1991年   67篇
  1990年   64篇
  1989年   80篇
  1988年   94篇
  1987年   100篇
  1986年   101篇
  1985年   94篇
  1984年   69篇
  1983年   64篇
  1982年   49篇
  1981年   50篇
  1980年   46篇
  1979年   45篇
  1978年   45篇
  1977年   45篇
  1976年   40篇
  1973年   37篇
  1955年   43篇
  1954年   35篇
排序方式: 共有6301条查询结果,搜索用时 15 毫秒
1.
2.
Occipital spur is an abnormal bony outgrowth of the external occipital protuberance (EOP). We describe an interesting and previously unreported case of fracture of an occipital spur following trauma. Our 20-year-old male patient was treated in the emergency department (ED) and discharged home without complication. Neurosurgical consultation was obtained but is not requisite for these injuries. Greater awareness of this unique presentation may help to expedite future emergency department treatment.  相似文献   
3.
Background Beating heart surgery has now become the commonest technique of doing Coronary Artery Bypass Graft Surgery (CABG) in our country. It is being used even in such high risk situations like diffuse coronary disease and Critical Left Main stem Stenosis (LMCS) with good results. The aim of this study is to retrospectively review our results in Off-Pump Coronary Artery Bypass Surgery (OPCAB) in patients with critical left main stem stenosis. Methods This study is a retrospective analysis of the data of patients who underwent primary coronary artery bypass surgery. During the period from April 2003 to September 2005 a total of 64 patients underwent OPCAB procedure for critical LMCS. During the same period 10 patients underwent CABG on Cardio Pulmonary Bypass (CPB). The age range was 36–77yrs. The sex distribution was M: F 53∶10. Ten patients were done as emergency. 2 of them were on Intra Aortic Balloon Pump (IABP) support preoperatively. 10 patients were high risk with a Euro score of ≥5. Results Left Internal Mammary Artery (LIMA) was used in 78% of cases. Average grafts per patient was 2.96. The median ventilation time was 5.91 hrs. New IABP insertion in postoperative period was required in 1 patient. One patient was reexplored for bleeding. There was one perioperative myocardial infarction. 57% of patients did not need any blood transfusion. There was no conversion to CPB. There was no operative mortality. Inotropes were used in ten cases. Conclusions OPCAB is a safe method of revascularization in patients with critical LMCS. Preoperative IABP is useful in patients with cardiogenic shock. However, there is a place for CPB in patients needing additional procedures like Mitral Valve repair (MV repair) or Dor's procedure or when the vessels are very diffusely diseased. Those patients who are unstable despite IABP support may be managed by Beating heart On Pump (BHOP) technique.  相似文献   
4.
5.
6.
7.
8.
We report here the antiproteolytic and antihemorrhagic properties of triterpenoid saponin inhibitors, named macrolobin-A and B, from Pentaclethra macroloba, against Bothrops snake venoms. The inhibitors were able to neutralize the hemorrhagic, fibrin(ogen)olytic, and proteolytic activities of class P-I and P-III metalloproteases isolated from B. neuwiedi and B. jararacussu venoms. Clotting and fibrinogenolytic activities induced by snake venoms and isolated thrombin-like enzymes were partially inhibited. Furthermore, the potential use of these inhibitors to complement antivenom therapy as an alternative treatment and/or used as molecular models for development of new therapeutical agents in the treatment of snake bite envenomations needs to be evaluated in future studies.  相似文献   
9.
Our molecular understanding of growth hormone-induced signal transduction has improved significantly over the past decades. At the same time, human population genetics and the analysis of genetically engineered animals have led to the discovery of genes that control specific aspects of the overall growth process. Although, currently, growth disorders are still diagnosed and treated on empirical bases, it might soon be possible to stratify patients predominantly by genetic defect, with treatment based on our molecular understanding of the role of the affected gene in the disease.  相似文献   
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