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   6572篇
  免费   781篇
  国内免费   18篇
耳鼻咽喉   57篇
儿科学   278篇
妇产科学   243篇
基础医学   683篇
口腔科学   99篇
临床医学   1699篇
内科学   1272篇
皮肤病学   73篇
神经病学   581篇
特种医学   207篇
外科学   712篇
综合类   242篇
一般理论   4篇
预防医学   578篇
眼科学   70篇
药学   320篇
中国医学   2篇
肿瘤学   251篇
  2023年   82篇
  2021年   97篇
  2020年   81篇
  2019年   91篇
  2018年   160篇
  2017年   169篇
  2016年   163篇
  2015年   175篇
  2014年   208篇
  2013年   278篇
  2012年   323篇
  2011年   321篇
  2010年   208篇
  2009年   216篇
  2008年   283篇
  2007年   320篇
  2006年   267篇
  2005年   255篇
  2004年   257篇
  2003年   216篇
  2002年   215篇
  2001年   221篇
  2000年   221篇
  1999年   183篇
  1998年   80篇
  1997年   99篇
  1996年   94篇
  1995年   114篇
  1994年   100篇
  1993年   83篇
  1992年   132篇
  1991年   138篇
  1990年   121篇
  1989年   97篇
  1988年   105篇
  1987年   92篇
  1986年   101篇
  1985年   90篇
  1984年   68篇
  1983年   76篇
  1982年   63篇
  1981年   48篇
  1980年   33篇
  1979年   61篇
  1978年   53篇
  1977年   33篇
  1976年   35篇
  1975年   45篇
  1974年   34篇
  1973年   33篇
排序方式: 共有7371条查询结果,搜索用时 0 毫秒
1.
2.
3.
For patients who receive a liver transplant (LTX) for alcoholic liver disease (ALD), investigators are focusing beyond survival to determine specific alcohol use outcomes. Studies suggest the use of alcohol ranges from 8 to 22% for the first post-transplant year with cumulative rates reaching 30 to 40% by 5 years following transplantation. Yet while investigators are interested in determining specific rates of alcohol use and predictors of use, only three studies since 1990 have been prospective. In 1998, we began a prospective study of post-LTX alcohol consumption in ALD recipients using multiple repeated measures of alcohol use. After 5 years of follow-up, we found that 22% had used any alcohol by the first year and 42% had a drink by 5 years. By 5 years, 26% drank at a heavier use (binge) pattern and 20% drank in a frequent pattern. In a univariate model, predictors of alcohol use included pre-transplant length of sobriety, a diagnosis of alcohol dependence, a history of other substance use, and prior alcohol rehabilitation.  相似文献   
4.
5.
MR compatibility of Guglielmi detachable coils   总被引:6,自引:0,他引:6  
  相似文献   
6.
7.
IL2-PE40 is a chimeric protein composed of human interleukin-2 (IL2) genetically fused to a modified form of Pseudomonas exotoxin lacking the cell recognition domain. IL2-PE40 is cytotoxic for IL2 receptor-bearing lymphocytes in culture and can inhibit activation of T cells in vivo. IL2-PE40 can significantly diminish antigen-stimulated proliferation of lymphocytes sensitized to myelin basic protein. Intraperitoneal administration of IL2-PE40 not only markedly inhibits the clinical manifestations of adoptively transferred relapsing experimental allergic encephalomyelitis but also dramatically reduces both inflammation and demyelination characteristic of the disease.  相似文献   
8.
Seventy-four 8th- and 10th-grade students attending a private girls' school in Hawaii were queried about their perceptions of and preparation for menstruation using a questionnaire administered in a health education class. Eighty percent had already started menstruating. The most frequently cited perceptions by the respondents referred to both the inconveniences and the normalcy of menstruation. Many were first informed about menstruation by their mothers and stated that they also first informed their mothers when they started menstruating. Surprise, fear, and embarrassment were common initial reactions, while strong negative or positive emotions were more rare. Only 35% wanted boys and girls together during class discussion, but 89% stated that boys needed to be informed about menstruation. The most frequent reasons cited for noncoed settings were the girls' concern about their comfort in openly discussing menstruation. Thirty-eight percent thought parents should inform other siblings when they started menstruation, although almost half gave specific conditions the parents should consider. The majority thought the fifth to sixth grades were the best times to introduce menstruation content.  相似文献   
9.
10.
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