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   3876450篇
  免费   278366篇
  国内免费   8360篇
耳鼻咽喉   54849篇
儿科学   127621篇
妇产科学   108004篇
基础医学   563777篇
口腔科学   110436篇
临床医学   357878篇
内科学   734760篇
皮肤病学   83307篇
神经病学   310682篇
特种医学   144664篇
外国民族医学   1110篇
外科学   573882篇
综合类   86303篇
现状与发展   13篇
一般理论   1434篇
预防医学   313497篇
眼科学   91338篇
药学   289196篇
  17篇
中国医学   8066篇
肿瘤学   202342篇
  2018年   42796篇
  2017年   32205篇
  2016年   35917篇
  2015年   40789篇
  2014年   57149篇
  2013年   87669篇
  2012年   119961篇
  2011年   127963篇
  2010年   76056篇
  2009年   70994篇
  2008年   119927篇
  2007年   127914篇
  2006年   129170篇
  2005年   125471篇
  2004年   120088篇
  2003年   115278篇
  2002年   111953篇
  2001年   167321篇
  2000年   171912篇
  1999年   145325篇
  1998年   43893篇
  1997年   38691篇
  1996年   38589篇
  1995年   36391篇
  1994年   33931篇
  1993年   31877篇
  1992年   115345篇
  1991年   113418篇
  1990年   110837篇
  1989年   106993篇
  1988年   98972篇
  1987年   97094篇
  1986年   92341篇
  1985年   88585篇
  1984年   66589篇
  1983年   57129篇
  1982年   34546篇
  1981年   30971篇
  1979年   62531篇
  1978年   44538篇
  1977年   37510篇
  1976年   36021篇
  1975年   38718篇
  1974年   46414篇
  1973年   44920篇
  1972年   42269篇
  1971年   39718篇
  1970年   36921篇
  1969年   34946篇
  1968年   32662篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
Primary chemotherapy administered to breast cancer patientsis the best model to identify baseline features able to predictwhich patients may be most likely to benefit or not from a cytotoxicregimen. In the March issue of Annals of Oncology two papersevaluated the predictive role of immunohistochemical p53 expressionon  相似文献   
105.
106.
107.
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   
108.
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   
109.
110.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  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