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   27581篇
  免费   2266篇
  国内免费   54篇
耳鼻咽喉   342篇
儿科学   966篇
妇产科学   600篇
基础医学   3701篇
口腔科学   515篇
临床医学   2717篇
内科学   6208篇
皮肤病学   311篇
神经病学   2569篇
特种医学   1198篇
外科学   4135篇
综合类   465篇
一般理论   85篇
预防医学   2270篇
眼科学   515篇
药学   1521篇
  2篇
中国医学   16篇
肿瘤学   1765篇
  2022年   182篇
  2021年   415篇
  2020年   269篇
  2019年   443篇
  2018年   555篇
  2017年   386篇
  2016年   400篇
  2015年   458篇
  2014年   668篇
  2013年   952篇
  2012年   1588篇
  2011年   1531篇
  2010年   866篇
  2009年   756篇
  2008年   1433篇
  2007年   1502篇
  2006年   1495篇
  2005年   1441篇
  2004年   1381篇
  2003年   1324篇
  2002年   1264篇
  2001年   591篇
  2000年   571篇
  1999年   527篇
  1998年   290篇
  1997年   295篇
  1996年   278篇
  1995年   240篇
  1994年   215篇
  1993年   233篇
  1992年   423篇
  1991年   451篇
  1990年   362篇
  1989年   416篇
  1988年   380篇
  1987年   398篇
  1986年   430篇
  1985年   365篇
  1984年   298篇
  1983年   335篇
  1982年   274篇
  1981年   228篇
  1980年   234篇
  1979年   320篇
  1978年   226篇
  1977年   172篇
  1976年   167篇
  1975年   179篇
  1974年   168篇
  1973年   170篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
One hundred sixty-eight adult siblings and parents from affected and control families were tested for ERP characteristics using two tasks involving an auditory oddball paradigm. Significant within family differences among affected families suggest that risk for developing alcoholism may be seen even in adult subjects who have had experience consuming alcohol. Further, analysis of quantity and recency of drinking in the past seven days were not correlated with either amplitude or latency of P300, suggesting that the within-family differences observed reflect relative risk for developing alcoholism rather than experience with alcohol.  相似文献   
82.
83.
Summary An unusual case of a woman with primary biliary cirrhosis and cutaneous sarcoidosis is described. The factors that allow a specific diagnosis of each condition are presented and the literature pertaining to such complex and unusual cases is presented.This work was supported in part by a grant from the Gastroenterology Medical Research Foundation of Southwestern Pennsylvania.  相似文献   
84.
85.
An infant is presented who at birth met criteria consistent with hypoplastic left heart syndrome. He was followed clinically and by 11 weeks of age demonstrated substantial growth of the left ventricle. He underwent successful repair of coarctation of the aorta and continues to do well with moderate aortic stenosis. The difficulties of predicting left ventricular growth and function are discussed, and management options are reviewed.  相似文献   
86.
We report a patient with alcohol-induced necrotizing pancreatitis who developed a severe ileus followed by incarceration of a portion of the transverse colon within a ventral hernia. Laparotomy 9 days after the onset of symptoms revealed infarction of the transverse colon and infection of the pancreas. This is the first report of a case of acute pancreatitis that led to a strangulated ventral hernia of the colon. We believe that the enteric organisms that infected the pancreas originated in the incarcerated transverse colon.  相似文献   
87.
This study examined the feasibility of using outpatient consultation letters as a means of assessing the clinical performance of clerks and house staff in a large teaching hospital. A total of 222 assessments were obtained based on samples of consultation problems from two clinical services. The method involved a two-stage rating scale based on the performance areas of Data Base, Problem Formulation, Diagnostic Tests, Management and Overall Assessment. The technique was investigated in terms of the objectivity, reliability, validity and efficiency of the performance ratings. Product-moment coefficients were used to assess inter- and intrarater agreement in scoring the consultation letters. These analyses identified a consistent difficulty in assessing the category of Data Base. For the remaining performance categories, interrater coefficients in the range .19-.76 and intrarater coefficients in the range .23-.96 were obtained. Other preliminary findings indicated good potential for a reliable and valid assessment. The method is technically feasible, and is based on a novel and reasonably unobtrusive approach to assessing trainee performance in a clinical setting.  相似文献   
88.
89.
90.
PURPOSE: To determine the independent relationship between leukoreduced platelet transfusions and adverse events in cardiac surgery. METHODS: In this observational study, detailed baseline and perioperative data were prospectively collected on consecutive patients who underwent cardiac surgery at a single institution from 1999 to 2004. The independent associations of platelet transfusion with clinical outcomes (low output syndrome, myocardial infarction, stroke, renal failure, sepsis, and death) were determined by multivariable logistic regression analysis and propensity score case-control analysis. RESULTS: Of the 11,459 patients analyzed, 2,174 (19%) received (leukoreduced) platelets - 1,408 received 5 U, 471 received 10 U, 140 received 15 U, and 155 received 20 or more units. Although all measured adverse event rates were higher in those who received platelets, in neither the logistic regression analyses nor the propensity score analyses was there any association between platelet transfusion and any of the adverse events. CONCLUSIONS: Transfusion of leukoreduced platelets in cardiac surgery is not associated with adverse clinical outcomes when adjustments are made for important confounders.  相似文献   
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