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   159996篇
  免费   14848篇
  国内免费   8576篇
耳鼻咽喉   1213篇
儿科学   2462篇
妇产科学   2059篇
基础医学   23509篇
口腔科学   2703篇
临床医学   19945篇
内科学   22827篇
皮肤病学   1734篇
神经病学   8378篇
特种医学   5203篇
外国民族医学   66篇
外科学   14889篇
综合类   23990篇
现状与发展   29篇
一般理论   49篇
预防医学   12615篇
眼科学   3777篇
药学   17440篇
  122篇
中国医学   7840篇
肿瘤学   12570篇
  2024年   585篇
  2023年   2322篇
  2022年   5878篇
  2021年   7584篇
  2020年   5508篇
  2019年   5047篇
  2018年   5283篇
  2017年   4791篇
  2016年   4645篇
  2015年   6694篇
  2014年   8283篇
  2013年   8369篇
  2012年   11772篇
  2011年   12493篇
  2010年   8483篇
  2009年   6933篇
  2008年   8741篇
  2007年   8874篇
  2006年   8124篇
  2005年   7468篇
  2004年   6083篇
  2003年   5892篇
  2002年   5128篇
  2001年   3547篇
  2000年   3041篇
  1999年   2752篇
  1998年   1863篇
  1997年   1972篇
  1996年   1427篇
  1995年   1355篇
  1994年   1215篇
  1993年   878篇
  1992年   1044篇
  1991年   956篇
  1990年   868篇
  1989年   798篇
  1988年   726篇
  1987年   612篇
  1986年   590篇
  1985年   485篇
  1984年   440篇
  1983年   374篇
  1982年   340篇
  1981年   315篇
  1980年   272篇
  1979年   261篇
  1978年   240篇
  1977年   259篇
  1976年   237篇
  1974年   194篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
我们现在要尽量使这些治疗方法进入临床试验证明他们的可行性现在脊髓损伤的临床试验基金很有限,所以只有很少的这些治疗方法真正用于病人主要的制药厂开始对脊髓损伤治疗产生兴趣,我们现在还有很多工作要做,但是前景方向十分清楚,我们需要努力快速的工作。  相似文献   
33.
Diesters based on isosteviol and dicarboxylic acids were synthesized and tested for antituberculous activity. Isosteviol and some of its derivatives exhibit appreciable tuberculostatic properties in vitro, the activity being dependent on the length of the polymethylene spacer connecting two ent-beyeran fragments. The mechanism of the antituberculous action of isosteviol derivatives are discussed. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 9, pp. 12–13, September, 2006.  相似文献   
34.
35.
36.
37.
Rapid growth in biomedical research coupled with dramatic advancement in biotechnology has significantly improved our understanding of the molecular basis involving cancer development and progression. This improvement has led to the discovery of new molecular markers for cancer diagnosis and prognosis as well as new molecular targets for cancer treatment and intervention. Continuous emergence of some new developing area in molecular profiling, new therapeutic agents, tissue microenvironment and systems biology have made significant progress in clinical oncology. Clinical research and investigation that focus on these new developments have begun to show exciting results that indicate future promises in improving patient management and survival.  相似文献   
38.
PURPOSE: Epidermal growth factor receptor is expressed in pediatric malignant solid tumors. We conducted a phase I trial of gefitinib, an epidermal growth factor receptor tyrosine kinase inhibitor, in children with refractory solid tumors. PATIENTS AND METHODS: Gefitinib (150, 300, 400, or 500 mg/m2) was administered orally to cohorts of three to six patients once daily continuously until disease progression or significant toxicity. Pharmacokinetic studies were performed during course one (day 1 through 28). RESULTS: Of the 25 enrolled patients, 19 (median age, 15 years) were fully evaluable for toxicity and received 54 courses. Dose-limiting toxicity was rash in two patients treated with 500 mg/m2 and elevated ALT and AST in one patient treated with 400 mg/m2. The maximum-tolerated dose was 400 mg/m2/d. The most frequent non-dose-limiting toxicities were grade 1 or 2 dry skin, anemia, diarrhea, nausea, and vomiting. One patient with Ewing's sarcoma had a partial response. Disease stabilized for 8 to > or = 60 weeks in two patients with Wilms' tumor and two with brainstem glioma (one exophytic). At 400 mg/m2, the median peak gefitinib plasma concentration was 2.2 microg/mL (range, 1.2 to 3.6 microg/mL) and occurred at a median of 2.3 hours (range, 2.0 to 8.3 hours) after drug administration. The median apparent clearance and median half-life were 14.8 L/h/m2 (range, 3.8 to 24.8 L/h/m2) and 11.7 hours (range, 5.6 to 22.8 hours), respectively. Gefitinib systemic exposures were comparable with those associated with antitumor activity in adults. CONCLUSION: Oral gefitinib is well tolerated in children. Development of the drug in combination with cytotoxic chemotherapy will be pursued.  相似文献   
39.
The influence of chronic administration of a dry cleared extract of Glycyrrhiza glabra (DCEG) containing flavonoids on the behavioral status and learning of intact and ovariectomized adult female rats has been studied. The DCEG preparation was administered in low (0.5 mg/kg, i.p.) and high (5.0 mg/kg, i.p.) daily doses over a period of 14 days and the results were evaluated on the passive avoidance situation model and in the open field test. It was established that the chronic administration of DCEG in both low and high doses produced correction of the passive avoidance performance in ovariectomized female rats. The administration of DCEG in a low dose also positively influenced the structure of purposeful behavior of females with deficiency of estrogens. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 39, No. 8, pp. 27 – 29, August, 2005.  相似文献   
40.
苏励教授治疗强直性脊柱炎经验介绍   总被引:1,自引:0,他引:1  
覃光辉  田雨  薛轶燕 《新中医》2005,37(6):15-16
苏励教授认为,脊柱在人体的位置处于皮里膜外,半表半里。强直性脊柱炎病在脊柱,故痰瘀之邪也盘踞在半表半里。治疗宜内清外透结合,在清里基础上外透,使邪有出路,从而清除盘踞在半表半里之邪实。并结合外治法以增加疗效。  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