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   42891篇
  免费   2989篇
  国内免费   163篇
耳鼻咽喉   508篇
儿科学   1389篇
妇产科学   675篇
基础医学   5184篇
口腔科学   551篇
临床医学   4397篇
内科学   9421篇
皮肤病学   728篇
神经病学   4166篇
特种医学   1696篇
外科学   7463篇
综合类   402篇
一般理论   82篇
预防医学   3230篇
眼科学   1165篇
药学   2235篇
中国医学   39篇
肿瘤学   2712篇
  2024年   32篇
  2023年   405篇
  2022年   687篇
  2021年   1573篇
  2020年   780篇
  2019年   1302篇
  2018年   1580篇
  2017年   1083篇
  2016年   1188篇
  2015年   1279篇
  2014年   1779篇
  2013年   2124篇
  2012年   3535篇
  2011年   3527篇
  2010年   1922篇
  2009年   1702篇
  2008年   2848篇
  2007年   2800篇
  2006年   2704篇
  2005年   2546篇
  2004年   2505篇
  2003年   2092篇
  2002年   1954篇
  2001年   292篇
  2000年   229篇
  1999年   289篇
  1998年   369篇
  1997年   321篇
  1996年   243篇
  1995年   233篇
  1994年   178篇
  1993年   172篇
  1992年   149篇
  1991年   148篇
  1990年   116篇
  1989年   109篇
  1988年   85篇
  1987年   98篇
  1986年   97篇
  1985年   87篇
  1984年   96篇
  1983年   99篇
  1982年   113篇
  1981年   87篇
  1980年   58篇
  1979年   43篇
  1978年   42篇
  1977年   40篇
  1976年   30篇
  1973年   32篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Since the 1990s, there has been a rise in the availability and recreational use of a herbal plant called Salvia divinorum. Numerous internet websites have advertised it for sale as a legal herbal alternative to illegal hallucinogens. Initial data surveying use has indicated many young adults are obtaining and using this herb for its psychoactive properties. Reported methods of ingestion for the plant include chewing, and smoking leaves or fortified extracts. Subjective effects of the plant include, affect changes, psychedelic-like changes in perception, and even loss of consciousness. Although the pharmacological properties and possible antidepressant effects have been studied in recent years, little information is known about potential negative impact resulting from recreational use, and scant information about Salvia divinorum currently exists in the psychological and substance abuse literature. While Salvia divinorum appears to be a substance with some therapeutic potential, it also poses some significant dangers as a substance of varying legal status with a potential for abuse.  相似文献   
102.
The clinical patterns and predictors of cytomegalovirus (CMV) disease in kidney and/or pancreas transplant patients on ganciclovir (1.0 g po t.i.d.) or valganciclovir (450 mg po q.d.) prophylaxis were studied. This is a retrospective analysis of 129 transplant recipients. Median follow up was 12 months (range, 6-18 months). The overall incidence of CMV disease at 1-year post-transplant was 14% (4% tissue-invasive, 10% noninvasive). Seventeen of 18 patients were diagnosed with CMV after completion of 3 months' prophylaxis (median 8 weeks, range, 2-28 weeks). Induction treatment with thymoglobulin, and Donor +/Recipient - CMV status were the strongest predictors for the development of CMV disease. Cytomegalovirus incidence was not different between patients treated with ganciclovir or valganciclovir (15 vs. 17%, respectively). Valganciclovir (450 mg q.d.) is as effective as oral ganciclovir in CMV prophylaxis. High-risk individuals might require higher doses or longer duration of valganciclovir treatment.  相似文献   
103.
104.
105.
106.
BACKGROUND: Patients with primary axillary hyperhidrosis experience substantial functional impairment and reduced health-related quality of life (HRQOL). Few studies have comprehensively evaluated the effects of botulinum toxin type A (BoNT-A) on these symptoms. OBJECTIVE: To prospectively assess the effects of BoNT-A on functional impairment associated with primary axillary hyperhidrosis. METHODS: Patients treated with BoNT-A 50 U per axilla at baseline were assessed 4 and 12 weeks later. Outcome measures included functional impairment as assessed by the Hyperhidrosis Disease Severity Scale and the Hyperhidrosis Impact Questionnaire and dermatology-specific HRQOL as assessed by the Dermatology Life Quality Index. RESULTS: At weeks 4 and 12 after BoNT-A treatment, 85% and 90% of patients achieved the a priori definition of treatment responder. Patients reported less occupational and emotional impairment, spent less time managing their hyperhidrosis, and had fewer difficulties in social situations. Adverse events were uncommon (5.5%), were mild, and did not require treatment. At study end, 53% of patients reported no dermatology-specific HRQOL impairment and 90% were satisfied with treatment. CONCLUSIONS: Significant, meaningful, rapid, and durable reductions in disease severity and functional impairment, as well as improvements in HRQOL, were seen following BoNT-A treatment. BoNT-A was safe and well tolerated, producing high levels of patient satisfaction.  相似文献   
107.
Male infertility is the result of a variety of highly treatable conditions. The critical step in treating male infertility is to evaluate properly every male partner of an infertile couple and to generate the proper treatment strategy. There are many medical and surgical options that can help most couples overcome male factor infertility. Male infertility can most easily be broken down into problems of sperm production (testicular dysfunction) and problems of sperm transport (obstruction). When applicable, medical therapies are used as an initial strategy to improve sperm production or as a preliminary therapy to boost production transiently in anticipation of a surgical sperm retrieval attempt. A range of surgical options is available to correct varicoceles, reconstruct the obstructed system, or retrieve sperm for assisted reproduction.  相似文献   
108.
109.
110.
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