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   136168篇
  免费   9440篇
  国内免费   630篇
耳鼻咽喉   1653篇
儿科学   3420篇
妇产科学   2460篇
基础医学   17401篇
口腔科学   2937篇
临床医学   13317篇
内科学   28039篇
皮肤病学   1753篇
神经病学   11953篇
特种医学   5398篇
外科学   21830篇
综合类   1917篇
现状与发展   1篇
一般理论   173篇
预防医学   12424篇
眼科学   2917篇
药学   9614篇
  2篇
中国医学   179篇
肿瘤学   8850篇
  2023年   672篇
  2022年   1052篇
  2021年   2581篇
  2020年   1469篇
  2019年   2399篇
  2018年   2937篇
  2017年   2114篇
  2016年   2232篇
  2015年   2716篇
  2014年   4025篇
  2013年   6060篇
  2012年   8880篇
  2011年   9448篇
  2010年   5259篇
  2009年   4813篇
  2008年   8388篇
  2007年   8989篇
  2006年   8561篇
  2005年   8716篇
  2004年   8372篇
  2003年   7877篇
  2002年   7684篇
  2001年   1280篇
  2000年   1055篇
  1999年   1401篇
  1998年   1627篇
  1997年   1304篇
  1996年   1251篇
  1995年   1216篇
  1994年   1034篇
  1993年   1006篇
  1992年   844篇
  1991年   866篇
  1990年   758篇
  1989年   737篇
  1988年   762篇
  1987年   739篇
  1986年   765篇
  1985年   842篇
  1984年   910篇
  1983年   870篇
  1982年   1131篇
  1981年   1158篇
  1980年   965篇
  1979年   636篇
  1978年   671篇
  1977年   599篇
  1976年   522篇
  1975年   469篇
  1974年   475篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
We describe a novel human zinc finger cNDA, C2H2-171. This cDNA represents an mRNA which encodes a protein of 484 amino acids and a calculated molecular weight of 54 kD. Four zinc finger-like domains are found in the C-terminal end of the protein. At the N-terminus, C2H2-171 contains a POZ/tramtrack-like domain similar to that found in the tumor associated zinc finger proteins LAZ-3/BCL-6 and PLZ-F, as well as in non-zinc finger proteins. C2H2-171 RNA is preferentially expressed in the brain, and increases during the course of murine development, with maximal expression in the adult. C2H2-171 RNA is differentially expressed in brain regions, with the highest level of expression in the cerebellum. C2H2-171 RNA was expressed at high levels in primary cerebellar granule cell neurons compared to astrocytes. The gene encoding C2H2-171 is highly conserved in vertebrates, and maps to the terminus of human chromosome 1 (1q44-ter). This chromosomal location is associated with a number of cytogenetic aberrations including those involving brain developmental anomalies and tumorigenesis. These data suggest that C2H2-171 may play an important role in vertebrate brain development and function.  相似文献   
63.
64.
65.
This article identifies common characteristics of educationally related programs that form a common basis for understanding and working with gifted programs. Special approaches and programs for educational enrichment as well as specific activities that have been successful are discussed.  相似文献   
66.
Interferon-α is the only approved and effective treatment for hepatitis C. Psychiatric side effects are common and have frequently required a decrease in dose or discontinuation of therapy. We here report a case of interferon-α-induced depression in a 40-yr-old man with hepatitis C successfully treated with the antidepressant fluoxetine, which allowed completion of interferon treatment.  相似文献   
67.
68.
Low-income minority patients from East St. Louis, Illinois, a depressed midwestern urban city, who had visited acute care settings with asthma symptoms, participated in a focus group. Questions were constructed around the Health Belief Model to characterize participants' experiences in receiving asthma care, their confidence in long-term asthma self-management, barriers they perceived to managing their asthma, and recommendations they would make for improving asthma care in their community. Analysis of comments suggests an appreciable understanding of asthma triggers, limited coping behaviors for asthma symptoms, very limited practice of active asthma management, perception of the health care system as frequently insensitive to their needs or their knowledge of their own care, exchange of well-articulated information regarding how to deal with the system, and an apparent lack of awareness of any potential contribution of patient education or support system.  相似文献   
69.
The optimum therapy for cryptococcal meningitis in patients with the acquired immunodeficiency syndrome (AIDS) remains unresolved. Traditional therapy consists of amphotericin B with or without flucytosine. Obstacles exist in administering these agents to patients with AIDS. Mortality rates during initial therapy are relatively high. Given the lack of proved benefit, we do not recommend adding flucytosine to amphotericin B routinely. The search for more efficacious and less toxic agents continues. The oral triazoles, especially fluconazole, have increased the options for treatment of this disease. New strategies and novel approaches in managing cryptococcal meningitis in patients with AIDS continue to be developed.  相似文献   
70.
Three saxophone players with upper limb amputations have been successfully rehabilitated to play their musical instruments using skin-conductivity touch control. Each attained a standard of musicianship sufficient to perform the standard repertoire of the instrument in a concert setting. The mechanical and electrical modifications to the saxophone are described, as well as the principles of operation of the skin-conductivity touch control module. The touch control module is commercially available for prosthetists who wish to fit musicians or others with upper extremity amputations who require rapid accurate control of a number of channels of powered prosthetic function.  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