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   297059篇
  免费   17279篇
  国内免费   420篇
耳鼻咽喉   4237篇
儿科学   10316篇
妇产科学   10290篇
基础医学   45026篇
口腔科学   7544篇
临床医学   24243篇
内科学   55938篇
皮肤病学   6338篇
神经病学   21054篇
特种医学   11639篇
外国民族医学   43篇
外科学   46884篇
综合类   7777篇
现状与发展   1篇
一般理论   160篇
预防医学   19923篇
眼科学   6956篇
药学   20930篇
中国医学   789篇
肿瘤学   14670篇
  2019年   2267篇
  2018年   3638篇
  2017年   2668篇
  2016年   3110篇
  2015年   3532篇
  2014年   4613篇
  2013年   7277篇
  2012年   9144篇
  2011年   9534篇
  2010年   6170篇
  2009年   5597篇
  2008年   8735篇
  2007年   9574篇
  2006年   9406篇
  2005年   9006篇
  2004年   8701篇
  2003年   8190篇
  2002年   7795篇
  2001年   13322篇
  2000年   13653篇
  1999年   11419篇
  1998年   3024篇
  1997年   2791篇
  1996年   2635篇
  1995年   2547篇
  1994年   2343篇
  1992年   8313篇
  1991年   8449篇
  1990年   8259篇
  1989年   8076篇
  1988年   7313篇
  1987年   7072篇
  1986年   6720篇
  1985年   6515篇
  1984年   4760篇
  1983年   4118篇
  1982年   2469篇
  1979年   4427篇
  1978年   3228篇
  1977年   2732篇
  1976年   2503篇
  1975年   2833篇
  1974年   3353篇
  1973年   3364篇
  1972年   3118篇
  1971年   2948篇
  1970年   2838篇
  1969年   2581篇
  1968年   2538篇
  1967年   2373篇
排序方式: 共有10000条查询结果,搜索用时 15 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