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   4286360篇
  免费   344203篇
  国内免费   14051篇
耳鼻咽喉   59779篇
儿科学   137076篇
妇产科学   112079篇
基础医学   660621篇
口腔科学   115235篇
临床医学   389632篇
内科学   775549篇
皮肤病学   107051篇
神经病学   357423篇
特种医学   166082篇
外国民族医学   514篇
外科学   657787篇
综合类   120408篇
现状与发展   24篇
一般理论   2679篇
预防医学   359215篇
眼科学   101214篇
药学   299972篇
  26篇
中国医学   11421篇
肿瘤学   210827篇
  2021年   56357篇
  2020年   35874篇
  2019年   58882篇
  2018年   74486篇
  2017年   56933篇
  2016年   63121篇
  2015年   76089篇
  2014年   110651篇
  2013年   176239篇
  2012年   127044篇
  2011年   133542篇
  2010年   127565篇
  2009年   128229篇
  2008年   119578篇
  2007年   127908篇
  2006年   136060篇
  2005年   131383篇
  2004年   131333篇
  2003年   121627篇
  2002年   110645篇
  2001年   150038篇
  2000年   144797篇
  1999年   134619篇
  1998年   70513篇
  1997年   66527篇
  1996年   64651篇
  1995年   59890篇
  1994年   53992篇
  1993年   50208篇
  1992年   96232篇
  1991年   92792篇
  1990年   89186篇
  1989年   86955篇
  1988年   80149篇
  1987年   78630篇
  1986年   73974篇
  1985年   73128篇
  1984年   61808篇
  1983年   55573篇
  1982年   46182篇
  1981年   43267篇
  1980年   40636篇
  1979年   53207篇
  1978年   44128篇
  1977年   38964篇
  1976年   36351篇
  1975年   36338篇
  1974年   39497篇
  1973年   37708篇
  1972年   35300篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
Liver-related death in human immunodeficiency virus (HIV)-infected individuals is about 10 times higher compared with the general population, and the prevalence of significant liver fibrosis in those with HIV approaches 15%. The present study aimed to assess risk factors for development of hepatic fibrosis in HIV patients receiving a modern combination anti-retroviral therapy (cART).This cross-sectional prospective study included 432 HIV patients, of which 68 (16%) patients were anti-hepatitis C virus (HCV) positive and 23 (5%) were HBsAg positive.Health trajectory including clinical characteristics and liver fibrosis stage assessed by transient elastography were collected at inclusion. Liver stiffness values >7.1 kPa were considered as significant fibrosis, while values >12.5 kPa were defined as severe fibrosis. Logistic regression and Cox regression uni- and multivariate analyses were performed to identify independent factors associated with liver fibrosis.Significant liver fibrosis was detected in 10% of HIV mono-infected, in 37% of HCV co-infected patients, and in 18% of hepatitis B virus co-infected patients. The presence of diabetes mellitus (odds ratio [OR] = 4.6) and FIB4 score (OR = 2.4) were independently associated with presence of significant fibrosis in the whole cohort. Similarly, diabetes mellitus (OR = 5.4), adiposity (OR = 4.6), and the FIB4 score (OR = 3.3) were independently associated with significant fibrosis in HIV mono-infected patients. Importantly, cumulative cART duration protected, whereas persistent HIV viral replication promoted the development of significant liver fibrosis along the duration of HIV infection.Our findings strongly indicate that besides known risk factors like metabolic disorders, HIV may also have a direct effect on fibrogenesis. Successful cART leading to complete suppression of HIV replication might protect from development of liver fibrosis.  相似文献   
994.
995.
996.
As countries implement Article 11 of the World Health Organization (WHO) Framework Convention on Tobacco Control, graphic warning labels that use images of people and their body parts to illustrate the consequences of smoking are being added to cigarette packs. According to exemplification theory, these case examples—exemplars—can shape perceptions about risk and may resonate differently among demographic subpopulations. Drawing on data from eight focus groups (N = 63) with smokers and nonsmokers from vulnerable populations, this qualitative study explores whether people considered exemplars in their reactions to and evaluations of U.S. graphic health warning labels initially proposed by the Food and Drug Administration. Participants made reference to prior and concurrent mass media messages and exemplars during the focus groups and used demographic cues in making sense of the images on the warning labels. Participants were particularly sensitive to age of the exemplars and how it might affect label effectiveness and beliefs about smoking. Race and socioeconomic status also were salient for some participants. We recommend that exemplars and exemplification be considered when selecting and evaluating graphic health warnings for tobacco labels and associated media campaigns.  相似文献   
997.
998.
999.
1000.
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