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   1700156篇
  免费   124036篇
  国内免费   3817篇
耳鼻咽喉   21748篇
儿科学   55707篇
妇产科学   46230篇
基础医学   241977篇
口腔科学   48854篇
临床医学   151770篇
内科学   334940篇
皮肤病学   38745篇
神经病学   131357篇
特种医学   64026篇
外国民族医学   242篇
外科学   258006篇
综合类   38965篇
现状与发展   4篇
一般理论   531篇
预防医学   124341篇
眼科学   40269篇
药学   123907篇
  7篇
中国医学   4485篇
肿瘤学   101898篇
  2021年   12904篇
  2019年   13599篇
  2018年   20059篇
  2017年   15288篇
  2016年   16717篇
  2015年   19065篇
  2014年   26346篇
  2013年   38103篇
  2012年   53006篇
  2011年   55685篇
  2010年   32929篇
  2009年   30826篇
  2008年   51781篇
  2007年   55049篇
  2006年   55512篇
  2005年   52809篇
  2004年   51014篇
  2003年   48440篇
  2002年   46590篇
  2001年   91908篇
  2000年   93729篇
  1999年   77093篇
  1998年   19797篇
  1997年   17314篇
  1996年   17436篇
  1995年   16784篇
  1994年   15324篇
  1993年   14132篇
  1992年   57466篇
  1991年   55380篇
  1990年   53056篇
  1989年   50837篇
  1988年   46207篇
  1987年   44990篇
  1986年   42269篇
  1985年   40035篇
  1984年   29385篇
  1983年   24944篇
  1982年   13911篇
  1979年   25549篇
  1978年   17589篇
  1977年   14924篇
  1976年   13894篇
  1975年   14577篇
  1974年   17644篇
  1973年   16960篇
  1972年   15684篇
  1971年   14466篇
  1970年   13447篇
  1969年   12532篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
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   
33.
34.
35.
36.
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   
37.
38.
39.
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   
40.
PURPOSE: In children with locally advanced or recurrent malignant tumours, prognosis can be improved by regional deep hyperthermia (RHT) in combination with platin-based chemotherapy. However, because of the increasing number of patients that achieve long-time remission with this therapy, it is necessary to evaluate long-term sequelae of thermochemotherapy. During the years 1993-2004 one has observed avascular osteonecrosis (AON) of the femoral head after RHT in seven children with pelvic germ cell tumours or rhabdomyosarcomas. METHODS: Although AON may develop in patients with malignancies treated with chemo- or radiotherapy alone, RHT might nevertheless contribute to the occurrence of AON. In order to determine potential risk factors for AON after RHT, this study analysed the relationship of AON to the patient's age, medical history and treatment parameters such as thermal dose equivalent and power output. RESULTS AND CONCLUSIONS: In the present study AON was associated with young age as well as intensity of hyperthermia indicated by high power levels that exceed 20 W per kg body weight and/or application of eight or more heat sessions as well as additional radiotherapy. Based on this observation, it was assumed that an optimized three dimensional thermal field modelling may be helpful to avoid hazardous temperatures in the femoral heads during RHT treatment and to reduce AON of the femoral heads.  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