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   137607篇
  免费   9521篇
  国内免费   630篇
耳鼻咽喉   1655篇
儿科学   3467篇
妇产科学   2465篇
基础医学   17574篇
口腔科学   2923篇
临床医学   13505篇
内科学   28205篇
皮肤病学   1764篇
神经病学   12091篇
特种医学   5427篇
外国民族医学   1篇
外科学   22069篇
综合类   1969篇
现状与发展   1篇
一般理论   173篇
预防医学   12633篇
眼科学   2942篇
药学   9709篇
  2篇
中国医学   179篇
肿瘤学   9004篇
  2023年   678篇
  2022年   1064篇
  2021年   2599篇
  2020年   1489篇
  2019年   2422篇
  2018年   2953篇
  2017年   2145篇
  2016年   2255篇
  2015年   2740篇
  2014年   4051篇
  2013年   6095篇
  2012年   8949篇
  2011年   9505篇
  2010年   5290篇
  2009年   4848篇
  2008年   8460篇
  2007年   9041篇
  2006年   8622篇
  2005年   8772篇
  2004年   8424篇
  2003年   7930篇
  2002年   7726篇
  2001年   1341篇
  2000年   1110篇
  1999年   1449篇
  1998年   1653篇
  1997年   1317篇
  1996年   1271篇
  1995年   1229篇
  1994年   1065篇
  1993年   1026篇
  1992年   892篇
  1991年   908篇
  1990年   796篇
  1989年   756篇
  1988年   781篇
  1987年   776篇
  1986年   783篇
  1985年   866篇
  1984年   937篇
  1983年   886篇
  1982年   1134篇
  1981年   1162篇
  1980年   971篇
  1979年   644篇
  1978年   675篇
  1977年   601篇
  1976年   532篇
  1975年   476篇
  1974年   483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.
A model for training the trainers of child care providers that employs Vygotsky's framework of the Zone of Proximal Development is described. This efficient training mechanism proposes mentoring relationships as a means to meet the developmental needs of experienced child care professionals and improve the quality of existing child care programs.The authors would like to thank Dr. Bille Thomas and the satellite resource center directors and staff members for their work on the project.  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