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   3121709篇
  免费   237061篇
  国内免费   5221篇
耳鼻咽喉   45458篇
儿科学   98199篇
妇产科学   82873篇
基础医学   439118篇
口腔科学   89832篇
临床医学   282611篇
内科学   602858篇
皮肤病学   65723篇
神经病学   255240篇
特种医学   124196篇
外国民族医学   1083篇
外科学   472289篇
综合类   72003篇
现状与发展   2篇
一般理论   1195篇
预防医学   243966篇
眼科学   73929篇
药学   237925篇
  11篇
中国医学   6378篇
肿瘤学   169102篇
  2018年   31825篇
  2017年   24627篇
  2016年   27334篇
  2015年   30759篇
  2014年   43883篇
  2013年   66153篇
  2012年   89647篇
  2011年   94704篇
  2010年   55918篇
  2009年   53208篇
  2008年   89281篇
  2007年   95444篇
  2006年   96682篇
  2005年   93530篇
  2004年   90100篇
  2003年   86885篇
  2002年   85454篇
  2001年   149144篇
  2000年   154474篇
  1999年   130339篇
  1998年   36442篇
  1997年   32822篇
  1996年   32604篇
  1995年   31256篇
  1994年   29215篇
  1993年   27313篇
  1992年   104005篇
  1991年   100304篇
  1990年   97193篇
  1989年   93869篇
  1988年   86823篇
  1987年   85151篇
  1986年   80769篇
  1985年   76919篇
  1984年   57561篇
  1983年   48921篇
  1982年   29014篇
  1981年   25641篇
  1979年   53583篇
  1978年   37183篇
  1977年   31968篇
  1976年   29337篇
  1975年   31612篇
  1974年   38488篇
  1973年   36620篇
  1972年   34475篇
  1971年   32025篇
  1970年   30067篇
  1969年   28213篇
  1968年   25513篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
The clinical outcome and appropriate management for patients showing 'borderline changes' on allograft biopsy after renal transplantation is still controversial. In an attempt to identify predictive factors of clinical outcome of patients with such lesions, we reviewed the clinical course of 91 patients with borderline changes. Multivariate analysis revealed significant and independent effects of histological stage (i + t < or = or > 2) and time to borderline changes (< or = or > 3 months after transplant) on serum creatinine levels at 1 year from borderline changes episodes (respectively, p = 0.04 and p = 0.02) and only a significant effect of time to borderline changes on serum creatinine levels at 2 years (p = 0.005). Renal function at 1 year and 2 years as 5- and 8-year graft survival were not significantly different in the group of patients treated with antirejection therapy (T group, n = 49) compared with the untreated group (UT group, n = 42). This study strongly suggests that borderline changes with histological score (i + t) > 2 and late episodes of borderline changes should be considered to be of poor prognosis.  相似文献   
84.
85.
Endoscopic clips have been used mainly for control of gastrointestinal (GI) bleeding and occasionally for closure of GI perforations. However, closure of spontaneous esophageal perforation (Boerhaave's syndrome) by clipping has not been reported. We described successful non-surgical closure of spontaneous esophageal perforation by endoscopic clipping in a patient with bilateral pyopneumothorax and septicemia.  相似文献   
86.
87.
88.
89.
90.
CONTEXT: Although the nonmedical use of stimulant drugs such as cocaine and methamphetamine is increasingly common in many rural areas of the United States, little is known about the health beliefs of people who use these drugs. PURPOSE: This research describes illicit stimulant drug users' views on health and health-related concepts that may affect their utilization of health care services. METHODS: A respondent-driven sampling plan was used to recruit 249 not-in-treatment, nonmedical stimulant drug users who were residing in 3 rural counties in west central Ohio. A structured questionnaire administered by trained interviewers was used to collect information on a range of topics, including current drug use, self-reported health status, perceived need for substance abuse treatment, and beliefs about health and health services. FINDINGS: Participants reported using a wide variety of drugs nonmedically, some by injection. Alcohol and marijuana were the most commonly used drugs in the 30 days prior to the interview. Powder cocaine was used by 72.3% of the sample, crack by 68.3%, and methamphetamine by 29.7%. Fair or poor health status was reported by 41.3% of the participants. Only 20.9% of the sample felt they needed drug abuse treatment. Less than one third of the sample reported that they would feel comfortable talking to a physician about their drug use, and 65.1% said they preferred taking care of their problems without getting professional help. CONCLUSIONS: Stimulant drug users in rural Ohio are involved with a range of substances and hold health beliefs that may impede health services utilization.  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