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   790797篇
  免费   43572篇
  国内免费   890篇
耳鼻咽喉   10523篇
儿科学   26279篇
妇产科学   22154篇
基础医学   129284篇
口腔科学   19190篇
临床医学   69283篇
内科学   145490篇
皮肤病学   17592篇
神经病学   53334篇
特种医学   30254篇
外国民族医学   96篇
外科学   119651篇
综合类   15001篇
现状与发展   3篇
一般理论   258篇
预防医学   56302篇
眼科学   18144篇
药学   59186篇
  1篇
中国医学   1834篇
肿瘤学   41400篇
  2021年   5821篇
  2018年   8816篇
  2017年   6434篇
  2016年   7500篇
  2015年   8408篇
  2014年   11190篇
  2013年   17001篇
  2012年   23501篇
  2011年   25480篇
  2010年   15339篇
  2009年   13770篇
  2008年   23253篇
  2007年   25650篇
  2006年   25117篇
  2005年   24013篇
  2004年   23369篇
  2003年   22348篇
  2002年   21436篇
  2001年   34097篇
  2000年   34997篇
  1999年   29037篇
  1998年   7880篇
  1997年   6879篇
  1996年   6747篇
  1995年   6424篇
  1992年   21776篇
  1991年   23089篇
  1990年   23051篇
  1989年   22592篇
  1988年   20682篇
  1987年   20383篇
  1986年   19048篇
  1985年   18420篇
  1984年   13583篇
  1983年   11610篇
  1982年   6416篇
  1979年   12950篇
  1978年   9265篇
  1977年   7594篇
  1976年   7743篇
  1975年   9142篇
  1974年   10412篇
  1973年   10151篇
  1972年   9381篇
  1971年   8948篇
  1970年   8463篇
  1969年   7783篇
  1968年   7474篇
  1967年   6757篇
  1966年   6037篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
This study examined electromyogram (EMG) and skin conductance level (SCL) as mediators of neuropsychological test performance of alcoholics. Alcoholics and controls with high EMG performed less well than low EMG subjects on 12 measures of neuropsychological performance. For SCL, the alcoholics and controls in the Low Group did not differ from those in the High Group on any measure. Analyses that used information intake (Low EMG and High SCL) and rejection (High EMG and Low SCL) information postures (IPs) demonstrated that the intake group outperformed the rejection group on 10 neuropsychological measures. Subjects with intake IPs reported more stimulation, concentration, and interest during the tasks than did subjects with rejection IPs. Results suggest that IPs can be used to identify alcoholics with neuropsychological deficits.  相似文献   
63.
64.
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   
65.
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   
66.
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   
67.
68.
Background The appearance of eosinophils is a hallmark sign of the allergic late-phase response (LPR). Eosinophil cationic protein (ECP), a readily measurable product released from activated eosinophils, has so far not been evaluated in the ocular LPR. Objective Two sets of trials were performed in order to investigate changes of local and systemic eosinophil activity and their possible link with symptoms and hyper-reactivity in the allergic LPR in the eye. Methods In the first experiment, ECP was analysed in tears and serum and the clinical reaction was evaluated during a 72-h time–course after a single, high-dose allergen challenge out of season in one eye of 15 pollen-sensitized volunteers. In a second experiment, the hypothesis of an increased clinical response to an allergen challenge in an eye that had been provoked with allergen 48h previously was tested in nine sensitized individuals. Results In the first experiment, symptoms at 10 min and 2, 4, 6, 8 and 24 h significantly exceeded base line scores of the challenged eyes. Tear ECP was significantly elevated in challenged eyes compared to contralateral eyes at 6, 8 and 24 h. In addition, symptoms and ECP release correlated significantly at the 24-h evaluation. Serum ECP remained unchanged throughout the study period. In the second experiment, conjunctival hyperreactivity 48h after an allergen challenge was not confirmed. Conclusion ECP secretion occurs in the experimental ocular LPR and is in part associated with the magnitude of the clinical reaction, which suggests a truly pathogenic role of the activated eosinophil in pollen-induced allergic conjunctivitis.  相似文献   
69.
70.
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