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   2458599篇
  免费   205297篇
  国内免费   5840篇
耳鼻咽喉   32581篇
儿科学   80898篇
妇产科学   67172篇
基础医学   365289篇
口腔科学   71017篇
临床医学   237486篇
内科学   481875篇
皮肤病学   55707篇
神经病学   207093篇
特种医学   88203篇
外国民族医学   609篇
外科学   344298篇
综合类   50789篇
现状与发展   4篇
一般理论   1024篇
预防医学   208679篇
眼科学   54817篇
药学   181014篇
  13篇
中国医学   5953篇
肿瘤学   135215篇
  2021年   20823篇
  2019年   29719篇
  2018年   35935篇
  2017年   29800篇
  2016年   32002篇
  2015年   35453篇
  2014年   45521篇
  2013年   65762篇
  2012年   81146篇
  2011年   85735篇
  2010年   54665篇
  2009年   48719篇
  2008年   77667篇
  2007年   81759篇
  2006年   81355篇
  2005年   78906篇
  2004年   75324篇
  2003年   71836篇
  2002年   69546篇
  2001年   103824篇
  2000年   106385篇
  1999年   89442篇
  1998年   25627篇
  1997年   23209篇
  1996年   23270篇
  1995年   22040篇
  1994年   20586篇
  1992年   70919篇
  1991年   69836篇
  1990年   67695篇
  1989年   64744篇
  1988年   60018篇
  1987年   58891篇
  1986年   56168篇
  1985年   53544篇
  1984年   40487篇
  1983年   35066篇
  1982年   21010篇
  1979年   37903篇
  1978年   27457篇
  1977年   22648篇
  1976年   21754篇
  1975年   22808篇
  1974年   27948篇
  1973年   27513篇
  1972年   25629篇
  1971年   23970篇
  1970年   22491篇
  1969年   20883篇
  1968年   19685篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
French asthma patients may be supervised by general practitioners (GPs) and/or specialists. Therefore, this study examined asthma management in patients exclusively supervised by specialists (SPE), GPs, (GP) and both (GP+SPE group), and compared the findings. Asthma patients were consecutively recruited in 348 pharmacies. Each patient completed a questionnaire providing data on personal characteristics, asthma management, perception of disease and asthma supervision. Asthma control was measured using the Asthma Control Test. Questionnaires were linked to computerised records of medications which had been dispensed before inclusion in the study. From the 1,256 patients (mean age = 36.1 yrs, 54.3% females), 11.4, 36.6, and 52.0% were placed in the SPE, GP, and GP+SPE groups, respectively. During the previous 4 weeks, most patients in the SPE group were properly controlled (52.2 versus 26.4 and 21.5% in GP and GP+SPE groups, respectively). The SPE group made more use of fixed combinations of long-acting beta agonist and inhaled corticosteroid, while receiving less short-acting beta agonists, antitussives and antibiotics. Striking differences in symptoms and asthma management were observed according to the type of asthma supervision. The current results strongly support the need to improve the management of asthma in primary care, and the coordination of care between general practitioners and specialists.  相似文献   
105.
106.
Spinocerebellar ataxia (SCA) types 2 and 3 are autosomal-dominant neurodegenerative disorders caused by mutations in two different genes. We identified mutations for SCA2 and SCA3 segregating simultaneously in a single Brazilian family. The index patient had SCA2, whereas her two second-degree cousins had SCA3. Disease was more rapidly progressive in the SCA2 patient, who presented severe brainstem and pancerebellar atrophy, as opposed to the two SCA3 patients, who had only mild cerebellar vermian atrophy. In such situations, molecular confirmation of all patients may avoid misdiagnosis of SCA subtypes and eventual errors in predictive testing of unaffected family members.  相似文献   
107.
108.
Research coordinators in intensive care are a growing specialty about which little is known. This cross-sectional study surveyed the Australia and New Zealand Intensive Care Research Coordinators' Group (n = 49) regarding demographics, education, employment history, job structure, and role content. Most research coordinators were highly qualified and experienced nurses who undertake pharmaceutical trials, multicenter projects, departmental medical and nursing research, audits and data registries, and their own projects.  相似文献   
109.
110.
OBJECTIVE: Surgical reduction and retention of apophyseal avulsion injuries at the medial epicondyle to prevent joint instability, lasting malalignment, or pseudarthrosis. INDICATIONS: Absolute: intraarticular apophyseal dislocation of the medial epicondyle, complete lesion of the ulnar nerve. Relative: dislocation of the apophysis (> 4 mm) in children > 5 years of age; the need for intervention increases in children as the degree of dislocation, age, and athletic activity increase. CONTRAINDICATIONS: Dislocation of the medial epicondyle (< or = 4 mm) in children < 5 years of age, provided the fragment location is not intraarticular. SURGICAL TECHNIQUE: Open reduction of the apophysis through a medial approach. Identification of the ulnar nerve. In young children or with small fragments fixation with Kirschner wire. Screw fixation in older children or for larger fragments. POSTOPERATIVE MANAGEMENT: Long upper-arm plaster cast until wound healing is achieved. Subsequently, upper-arm plaster cast for 3 weeks. Removal of Kirschner wires after 4-6 weeks, screw removal after 8-12 weeks. Physiotherapy only if marked reduction of elbow mobility is found 6 weeks after cast removal. RESULTS: From January 1, 1994 to December 31, 2003, 25 children with an average age of 12 years suffering from medial epicondylar avulsion fractures were operated on using open reduction and Kirschner wire fixation. An average of 3 years after the injury 14 of these children underwent follow-up examination using a procedure that took subjective, clinical and radiologic parameters into account. Two children showed a slight reduction in overall strength of the injured extremity when compared with the contralateral extremity. One child had a flexion deficit of 10 degrees, all other children showed movement limitations of < or = 5 degrees compared to the contralateral extremity. In all the cases available to follow-up, there was a slight increase in valgus alignment of the elbow joint compared with the uninjured side (3 degrees on average). All fractures consolidated within 6 weeks.  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