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   136132篇
  免费   9442篇
  国内免费   630篇
耳鼻咽喉   1654篇
儿科学   3432篇
妇产科学   2445篇
基础医学   17402篇
口腔科学   2903篇
临床医学   13313篇
内科学   28018篇
皮肤病学   1752篇
神经病学   11950篇
特种医学   5443篇
外科学   21827篇
综合类   1916篇
现状与发展   1篇
一般理论   173篇
预防医学   12425篇
眼科学   2917篇
药学   9606篇
  2篇
中国医学   180篇
肿瘤学   8845篇
  2023年   671篇
  2022年   1048篇
  2021年   2573篇
  2020年   1467篇
  2019年   2395篇
  2018年   2926篇
  2017年   2112篇
  2016年   2235篇
  2015年   2715篇
  2014年   4018篇
  2013年   6059篇
  2012年   8868篇
  2011年   9439篇
  2010年   5263篇
  2009年   4816篇
  2008年   8386篇
  2007年   8989篇
  2006年   8565篇
  2005年   8719篇
  2004年   8377篇
  2003年   7873篇
  2002年   7681篇
  2001年   1280篇
  2000年   1051篇
  1999年   1398篇
  1998年   1638篇
  1997年   1318篇
  1996年   1258篇
  1995年   1220篇
  1994年   1039篇
  1993年   1007篇
  1992年   839篇
  1991年   866篇
  1990年   753篇
  1989年   739篇
  1988年   760篇
  1987年   747篇
  1986年   765篇
  1985年   846篇
  1984年   909篇
  1983年   871篇
  1982年   1132篇
  1981年   1157篇
  1980年   968篇
  1979年   632篇
  1978年   669篇
  1977年   599篇
  1976年   523篇
  1975年   474篇
  1974年   471篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
Summary It has been suggested that inherited traits play a role in the development of osteoporosis by providing a background for the modulation of gene expression. In this study, we examine the influence of the different alleles of alpha2-HS glycoprotein (AHSG), a protein of the bone matrix, on quantitative estrogens, estrone and estradiol, and bone measures, bone area and density. Estrogens provide a protective effect against fractures in older women and were thus included in the analyses. Isoelectric focusing of AHSG from sera followed by immunoblotting was used to type 163 white post-menopausal women participating in a clinical trial of the effects of walking on bone loss. Plasma hormones were measured by a combination of extraction, column chromatography, and radioimmunoassay; bone measures on the dominant radius were determined with computerized tomography. Analysis of variance was done on estrogen and bone measures after controlling for the effects of age and body mass index. The two major alleles of AHSG result in three phenotypes, designated AHSG 1-1, AHSG 2-1, and AHSG 2-2. The AHSG 1-1 homozygote showed a decreased concentration of estradiol, the AHSG 2-2 homozygote showed an increased concentration, and the AHSG 2-1 heterozygote was intermediate (P=0.001). Estrone demonstrated a similar pattern in residual analysis although it did not reach statistical significance.  相似文献   
94.
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   
95.
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   
96.
Heterosexual men and homosexual men rated how arousing different sexual fantasies were and how often they had used these fantasies over the previous year. Within each group, sensual and genital same-orientation fantasies were more arousing than either public-sex or dominance-submissive fantasies, which in turn were more arousing than aggressive-sex fantasies. For both heterosexual and homosexual men the extent to which a fantasy was arousing correlated with the person's experience of the activity depicted in the fantasy. The frequency of use of a fantasy correlated positively with its arousal level but not always subtantially so. The results are discussed in the context of the mediating role of fantasy in human sexual arousal.  相似文献   
97.
98.
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   
99.
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   
100.
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