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   536404篇
  免费   27925篇
  国内免费   523篇
耳鼻咽喉   6832篇
儿科学   17234篇
妇产科学   12670篇
基础医学   93125篇
口腔科学   12548篇
临床医学   48906篇
内科学   96747篇
皮肤病学   11957篇
神经病学   34380篇
特种医学   19994篇
外国民族医学   53篇
外科学   79490篇
综合类   7694篇
现状与发展   3篇
一般理论   112篇
预防医学   38740篇
眼科学   12072篇
药学   41923篇
  2篇
中国医学   1148篇
肿瘤学   29222篇
  2021年   4076篇
  2019年   4017篇
  2018年   5900篇
  2017年   4251篇
  2016年   5030篇
  2015年   5562篇
  2014年   7412篇
  2013年   10833篇
  2012年   16093篇
  2011年   17946篇
  2010年   10310篇
  2009年   9118篇
  2008年   16123篇
  2007年   17888篇
  2006年   17353篇
  2005年   16668篇
  2004年   16243篇
  2003年   15591篇
  2002年   15098篇
  2001年   22493篇
  2000年   23012篇
  1999年   18953篇
  1998年   5275篇
  1997年   4406篇
  1996年   4427篇
  1995年   4149篇
  1992年   14430篇
  1991年   15844篇
  1990年   15968篇
  1989年   15643篇
  1988年   14317篇
  1987年   14204篇
  1986年   13175篇
  1985年   12692篇
  1984年   9401篇
  1983年   8008篇
  1982年   4186篇
  1979年   8943篇
  1978年   6383篇
  1977年   5153篇
  1976年   5507篇
  1975年   6614篇
  1974年   7421篇
  1973年   7158篇
  1972年   6598篇
  1971年   6310篇
  1970年   5889篇
  1969年   5467篇
  1968年   5161篇
  1967年   4621篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
Fronto-ethmoidal mucocoeles: a histopathological analysis.   总被引:1,自引:0,他引:1  
From a series of 118 fronto-ethmoidal mucocoeles, 40 specimens have been submitted to detailed histological analysis. The frequency of each epithelial and sub-epithelial component is considered and reveals features which support a dynamic theory of bone resorption and formation rather than that of pressure erosion in the pathogenesis of mucocoeles.  相似文献   
63.
Facial reanimation after acoustic neuroma excision is currently accomplished using a variety of surgical techniques. A multi-institutional survey of patient perceptions of facial reanimation success was accomplished by mailing a questionnaire to 809 randomly selected members of the Acoustic Neuroma Association. Four hundred sixty patients who underwent 296 reanimation procedures responded. Facial to hypoglossal nerve anastomosis, tarsorrhaphy, and upper eyelid implants were most frequently performed. The patient's estimations of initial deficit, spontaneous recovery, and overall satisfaction with the reanimation procedures are discussed.  相似文献   
64.
Most authors consider the principal advantage of FG anastomoses (compared to microsurgical anastomoses) to be shorter operating time, reduced surgical trauma to oviduct stumps, and absence of tissue ischemia. These features promote reparative regeneration and decrease adhesion formation, resulting in complete recanalization of fallopian tubes. To date, the majority of work on FG is confined to the experimental development of surgical techniques. Investigations in reconstructive gynecological surgery are quite uncommon. The physical properties of FG and the positive results of available experimental studies suggest that further development of surgical techniques using FG in obstetrics and gynecology is worthwhile.  相似文献   
65.
66.
67.
68.
Background: The management and follow-up of asthma patients presenting at Accident and Emergency (A&E) departments have mostly been studied in children's hospitals or specialised teaching hospitals. Aims: To study the adequacy of assessment, treatment and follow-up of patients presenting at A&E departments in non-teaching hospitals. Methods: A twenty-five per cent sample of presentations to A&E departments in all public hospitals in the Illawarra for one year was selected for a case note audit. Information on demographics, assessment, management and referral was extracted from the A&E case notes and medical records of cases with documentation of a final diagnosis of asthma. Chi square and Fischer's Exact tests were used for comparisons among hospitals. Results: Of 359 presentations with a final diagnosis of asthma, 88% were self referred and only 5% were first presentations. Objective measures of airways obstruction was not documented in 34% of admissions and 48% of nonadmissions. There was no documented follow-up in 28% of cases. The assessment and management of asthma in A&E was significantly poorer in smaller hospitals. Conclusion: Evidence of high use of A&E as a primary care facility by asthma patients was found in the study. There is a need to implement protocols to optimise assessment and treatment of asthma in smaller hospitals. (Aust NZ J Med 1993; 23: 672–677.).  相似文献   
69.
Felty's syndrome (FS), the association of rheumatoid arthritis (RA) and idiopathic neutropenia, remains an unexplained phenomenon. HLA-DR4 is found in over 90% of cases. Patients with FS may have a T cell lymphocytosis of CD3+CD8+CD57+ large granular lymphocytes (LGL syndrome). In this study of 47 patients with FS, 19% had clear evidence for LGL expansions, while in total 42% had variable evidence for the LGL syndrome using currently available techniques. Of these T cell expansions, 76% were clonal, as demonstrated by Southern blotting and analysis with T cell receptor (TCR) beta chain constant region probes. This technique may fail to detect clonal populations in some patients. Cytofluorographic analysis using antibodies specific for TCR V beta chains identified patients with clonal LGL expansions with results comparable to those obtained with Southern blotting. No evidence for shared V beta usage among expansions from different patients was seen. The role of LGL in RA and FS is currently unclear, but this technique offers a practical and accessible means of identifying patients with LGL expansions, as a starting point for further investigation.  相似文献   
70.
Case report 506   总被引:1,自引:0,他引:1  
  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