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   296277篇
  免费   17246篇
  国内免费   415篇
耳鼻咽喉   4220篇
儿科学   10294篇
妇产科学   10243篇
基础医学   44970篇
口腔科学   7497篇
临床医学   24172篇
内科学   55805篇
皮肤病学   6310篇
神经病学   21007篇
特种医学   11623篇
外国民族医学   43篇
外科学   46663篇
综合类   7767篇
现状与发展   1篇
一般理论   160篇
预防医学   19912篇
眼科学   6943篇
药学   20907篇
中国医学   787篇
肿瘤学   14614篇
  2018年   3617篇
  2017年   2652篇
  2016年   3073篇
  2015年   3491篇
  2014年   4574篇
  2013年   7204篇
  2012年   9055篇
  2011年   9440篇
  2010年   6124篇
  2009年   5547篇
  2008年   8666篇
  2007年   9515篇
  2006年   9354篇
  2005年   8949篇
  2004年   8663篇
  2003年   8164篇
  2002年   7766篇
  2001年   13323篇
  2000年   13654篇
  1999年   11418篇
  1998年   3024篇
  1997年   2788篇
  1996年   2639篇
  1995年   2551篇
  1994年   2345篇
  1992年   8321篇
  1991年   8456篇
  1990年   8263篇
  1989年   8083篇
  1988年   7317篇
  1987年   7075篇
  1986年   6722篇
  1985年   6520篇
  1984年   4763篇
  1983年   4121篇
  1982年   2472篇
  1979年   4429篇
  1978年   3230篇
  1977年   2731篇
  1976年   2503篇
  1975年   2833篇
  1974年   3353篇
  1973年   3364篇
  1972年   3118篇
  1971年   2953篇
  1970年   2841篇
  1969年   2584篇
  1968年   2542篇
  1967年   2374篇
  1966年   2265篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
An increase in the number of cases of tuberculosis, especially in children, has been observed recently. Post-vaccination conversion rate in babies immunised with BCG was assessed. Sensitization was detected as early as 4 weeks after BCG inoculation. Although 84.2% had physical evidence of BCG inoculation only 69.8% had developed detectable sensitization to the tubercle bacilli as shown by the Mantoux test.  相似文献   
23.
24.
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   
25.
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   
26.
27.
Recurrent erosion   总被引:1,自引:0,他引:1  
  相似文献   
28.
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   
29.
30.
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