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   674869篇
  免费   33224篇
  国内免费   828篇
耳鼻咽喉   8598篇
儿科学   20997篇
妇产科学   15893篇
基础医学   113137篇
口腔科学   17383篇
临床医学   56923篇
内科学   126779篇
皮肤病学   15920篇
神经病学   45933篇
特种医学   23102篇
外国民族医学   54篇
外科学   94753篇
综合类   8294篇
现状与发展   2篇
一般理论   128篇
预防医学   56415篇
眼科学   15774篇
药学   52664篇
  1篇
中国医学   1714篇
肿瘤学   34457篇
  2021年   6177篇
  2019年   6501篇
  2018年   10218篇
  2017年   6918篇
  2016年   7627篇
  2015年   8465篇
  2014年   10565篇
  2013年   15735篇
  2012年   24642篇
  2011年   26996篇
  2010年   14707篇
  2009年   12284篇
  2008年   23542篇
  2007年   25805篇
  2006年   24955篇
  2005年   23953篇
  2004年   22934篇
  2003年   21911篇
  2002年   21091篇
  2001年   26543篇
  2000年   27485篇
  1999年   22351篇
  1998年   5848篇
  1997年   4754篇
  1996年   4798篇
  1992年   16280篇
  1991年   17516篇
  1990年   17607篇
  1989年   17001篇
  1988年   15662篇
  1987年   15442篇
  1986年   14465篇
  1985年   13921篇
  1984年   10287篇
  1983年   8757篇
  1982年   4572篇
  1979年   9935篇
  1978年   7031篇
  1977年   5800篇
  1976年   6124篇
  1975年   7333篇
  1974年   8369篇
  1973年   8123篇
  1972年   7533篇
  1971年   7203篇
  1970年   6724篇
  1969年   6349篇
  1968年   6083篇
  1967年   5443篇
  1966年   4714篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
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   
82.
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   
83.
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   
84.
85.
86.
87.
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   
88.
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   
89.
Case report 506   总被引:1,自引:0,他引:1  
  相似文献   
90.
Electrocardiographic symptoms were evaluated in 53 patients with an additional left-ventricular chorda (ALVC), detected by two-dimensional echocardiography. Signs of early ventricular repolarization (EVR) were identified in 45 (84.9%) patients. A transverse ALVC was more common in EVR-free patients (87.5%), as compared to patients with ALVC + EVR combinations (51.1%; p less than 0.05).  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