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   17281篇
  免费   1762篇
  国内免费   37篇
耳鼻咽喉   143篇
儿科学   601篇
妇产科学   525篇
基础医学   2516篇
口腔科学   329篇
临床医学   2050篇
内科学   3338篇
皮肤病学   230篇
神经病学   1315篇
特种医学   748篇
外国民族医学   3篇
外科学   2065篇
综合类   390篇
一般理论   11篇
预防医学   1940篇
眼科学   375篇
药学   1313篇
  1篇
中国医学   12篇
肿瘤学   1175篇
  2021年   210篇
  2020年   152篇
  2019年   244篇
  2018年   264篇
  2017年   211篇
  2016年   240篇
  2015年   263篇
  2014年   358篇
  2013年   550篇
  2012年   707篇
  2011年   790篇
  2010年   507篇
  2009年   434篇
  2008年   678篇
  2007年   723篇
  2006年   647篇
  2005年   685篇
  2004年   665篇
  2003年   675篇
  2002年   582篇
  2001年   548篇
  2000年   552篇
  1999年   474篇
  1998年   275篇
  1997年   237篇
  1996年   206篇
  1995年   218篇
  1994年   178篇
  1993年   187篇
  1992年   411篇
  1991年   423篇
  1990年   422篇
  1989年   389篇
  1988年   407篇
  1987年   384篇
  1986年   335篇
  1985年   309篇
  1984年   266篇
  1983年   226篇
  1982年   137篇
  1980年   133篇
  1979年   220篇
  1978年   184篇
  1977年   153篇
  1976年   160篇
  1975年   159篇
  1974年   153篇
  1973年   175篇
  1972年   142篇
  1970年   137篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
Public and professional debate over what, if any, action should be taken by state regulatory agencies regarding AIDS and the HIV status of dentists has increased in recent months. To determine if state boards had workable policies in place or were considering such policies, a telephone survey of all state boards was undertaken. All boards participated, although three provided only limited information. As of early 1992, only two boards required evidence of immunity to HVB for relicensure and none require evidence of seronegativity to HIV for relicensure. Twelve percent of the boards anticipate such requirements within two years. None have mandatory HIV testing, but 13 percent anticipate such requirements in the near future. The authors conclude that while few agencies have taken more than tentative steps toward rigorous HIV testing or restrictions, most are aware of much closer public scrutiny. More restrictions seem likely as these agencies attempt to balance public and professional rights and responsibilities.  相似文献   
22.
Background: Research on religion and health suggests general health benefits for those who are more religiously involved. Particular aspects of religiosity that may influence this finding, however, have not been sufficiently investigated.Purpose: This study was designed to explore the relationship between religious orientation (intrinsic, extrinsic) and blood pressure reactivity among older (over 60 years) and younger (18–24 years) adults exposed to two qualitatively different laboratory stressors (cognitive, interpersonal).Methods:Participants were categorized as exhibiting either a predominately intrinsic or extrinsic religious orientation based on scores on the Religious Orientation Scale. They were subsequently exposed (in counterbalanced order) to two laboratory stressors that varied in terms of whether an interpersonal confrontation was involved. Measures of blood pressure were obtained at baseline and during stressor presentation.Results: Analyses indicated that older extrinsically religious individuals demonstrated exaggerated reactivity compared to younger participants and older intrinsically religious individuals. Older intrinsically religious participants did not differ from younger persons. Similar results were found for analysis of baseline data. Extrinsic participants had greater reactivity during the interpersonal confrontation condition than did intrinsic individuals.Conclusions: These findings suggest that religious orientation may be an important variable to study regarding cardiovascular reactivity in, particularly, older adults. This research was supported in part by National Institute on Aging Grant 1 R03 AG 18554-01. A previous version of this article was presented in August 2002 as a Citation Paper at the 110th Annual Convention of the American Psychological Association, Chicago. We thank Timothy W. Smith, James A. Blumenthal, Carl E. Thoresen, and Edward M. Heath for their assistance throughout this project. We also thank Llewellyn Jones and Jodi Hildabrandt for their efforts in collecting data.  相似文献   
23.
24.
25.
26.
The incidence of transient hypogammaglobulinaemia of infancy (THI) detected in a major paediatric centre over a 10 year period was examined. A total of 2468 subjects less than 2 years of age had an IgG measurement taken between July 1979 and March 1990. Subjects with known immunodeficiencies were excluded. Fifteen patients were classified as having THI with an initial IgG level less than the fifth centile followed by a second measurement within the normal range. A further 24 patients were identified as having possible THI with a single low IgG concentration. There were 60,174 live births each year in Victoria in the years 1979-88. This gives an incidence of proved THI of 23 per 10(6) births, and including proved and probable THI an incidence of 61 per 10(6) live births. Of those patients with proved THI 12/15 had symptoms of either atopic disease or food allergy/intolerance and three had gastrointestinal symptoms without any evidence of atopic disease. At presentation 12/15 (80%) were IgA deficient and 9/15 had IgM concentrations less than the 20th centile for age. It is suggested that in view of the preponderance of atopic and food intolerant patients that subclinical protein loss from the bowel due to allergic inflammation may be a contributing factor to the development of THI in some patients.  相似文献   
27.
A young dog with progressive neurological signs was humanely killed by the injection of barbiturate for postmortem examination. Lesions in the nose, lung, pancreas, lymph nodes, kidneys and the meninges were heavily infiltrated with Cryptococcus neoformans. In addition, haemangiosarcoma was detected in the right atrium. The finding of systemic mycosis and neoplasia together in a young dog suggests an immunosuppressed state.  相似文献   
28.
This study examined the use of autologous fat as an alternative to Teflon® and collagen as the implantable material in vocal cord medialization. Five animals underwent left recurrent laryngeal nerve sections with subsequent fat harvest and implantation into the left true vocal cords. Three animals were killed after 48 hours and 2 after 3 weeks; their larynges were examined with light microscopy. The results of the 48-hour samples show moderate acute inflammation and few areas of focal necrosis. The 3-week samples show no necrotic foci, minimal foreign-body reaction, and maintenance of structure and volume of the injected fat. Autologous fat may prove to be a valuable alternative to nonautologous injectable material in vocal cord augmentation.  相似文献   
29.
30.
To study the effects of electroconvulsive therapy (ECT) on hormone release, we measured circulating concentrations of adrenocorticotropic hormone (ACTH), prolactin (PRL), growth hormone (GH) and cortisol (CORT) immediately before and at 2 min, 5 min, 15 min, and 30 min following ECT. Compared to pre-ECT concentrations, there were significant increases in post-ECT plasma ACTH, PRL and CORT. GH did not change consistently. No significant difference between unilateral and bilateral ECT was observed. Compared to the first ECT, repeated treatments were associated with a significant decrease in the magnitude of hormone surge. These hormonal changes induced by ECT may reflect changes at the neurotransmitter level.  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