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   1734266篇
  免费   126291篇
  国内免费   3925篇
耳鼻咽喉   22167篇
儿科学   56687篇
妇产科学   46901篇
基础医学   246177篇
口腔科学   49726篇
临床医学   155669篇
内科学   341230篇
皮肤病学   39150篇
神经病学   134608篇
特种医学   65398篇
外国民族医学   242篇
外科学   262230篇
综合类   39394篇
现状与发展   4篇
一般理论   568篇
预防医学   127912篇
眼科学   41288篇
药学   126591篇
  7篇
中国医学   4557篇
肿瘤学   103976篇
  2021年   13316篇
  2019年   14124篇
  2018年   20640篇
  2017年   15770篇
  2016年   17194篇
  2015年   19636篇
  2014年   27242篇
  2013年   39639篇
  2012年   55097篇
  2011年   57922篇
  2010年   34223篇
  2009年   32150篇
  2008年   54001篇
  2007年   57552篇
  2006年   58009篇
  2005年   55171篇
  2004年   53312篇
  2003年   50599篇
  2002年   48776篇
  2001年   92214篇
  2000年   93950篇
  1999年   77379篇
  1998年   20243篇
  1997年   17704篇
  1996年   17791篇
  1995年   17150篇
  1994年   15646篇
  1993年   14374篇
  1992年   57653篇
  1991年   55542篇
  1990年   53208篇
  1989年   50979篇
  1988年   46370篇
  1987年   45166篇
  1986年   42418篇
  1985年   40200篇
  1984年   29641篇
  1983年   25142篇
  1982年   14194篇
  1981年   12700篇
  1979年   25702篇
  1978年   17744篇
  1977年   15083篇
  1976年   14013篇
  1975年   14675篇
  1974年   17737篇
  1973年   17021篇
  1972年   15743篇
  1971年   14501篇
  1970年   13475篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
Infections due to Penicillium species other than P.marneffei are rare. We identified a boy with X-linked chronic granulomatous disease (X-CGD) with a pulmonary nodule and adjacent rib osteomyelitis caused by Penicillium piceum. The only sign of infection was an elevated sedimentation rate. P. piceum was isolated by fine needle aspirate and from excised infected tissues. Surgical removal and one year of voriconazole treatment were very well tolerated and led to complete recovery. Microbiological, microscopic and molecular studies support the fungal diagnosis. P. piceum should be considered as a relevant pathogen in immunocompromised patients.  相似文献   
34.
35.
36.
37.
Although surgical lung resection could improve prognosis in some patients with multidrug-resistant tuberculosis (MDR-TB), there are no reports on the optimal candidates for this surgery. The aim of the present study was to elucidate the prognostic factors for surgery in patients with MDR-TB. Patients who underwent lung resection for the treatment of MDR-TB between March 1993 and December 2004 were included in the present study. Treatment failure was defined as greater than or equal to two of the five cultures recorded in the final 12 months of treatment being positive, any one of the final three cultures being positive, or the patient having died during treatment. The variables that affected treatment outcomes were identified through univariate and multivariate logistic regression analysis. In total, 79 patients with MDR-TB were included in the present study. The treatment outcomes of 22 (27.8%) patients were classified as failure. A body mass index <18.5 kg x m(-2), primary resistance, resistance to ofloxacin and the presence of a cavitary lesion beyond the range of the surgical resection were associated with treatment failure. Low body mass index, primary resistance, resistance to ofloxacin and cavitary lesions beyond the range of resection are possible poor prognostic factors for surgical lung resection in multidrug-resistant tuberculosis patients.  相似文献   
38.
39.
40.
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