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   3329394篇
  免费   224655篇
  国内免费   5687篇
耳鼻咽喉   45461篇
儿科学   107780篇
妇产科学   90811篇
基础医学   482053篇
口腔科学   91444篇
临床医学   301451篇
内科学   638848篇
皮肤病学   73794篇
神经病学   266392篇
特种医学   123694篇
外国民族医学   913篇
外科学   494076篇
综合类   72360篇
现状与发展   15篇
一般理论   1253篇
预防医学   264137篇
眼科学   76952篇
药学   242350篇
  85篇
中国医学   7006篇
肿瘤学   178861篇
  2021年   27224篇
  2019年   28546篇
  2018年   38117篇
  2017年   28804篇
  2016年   32481篇
  2015年   36428篇
  2014年   51669篇
  2013年   77106篇
  2012年   106048篇
  2011年   113045篇
  2010年   66762篇
  2009年   63356篇
  2008年   105102篇
  2007年   111669篇
  2006年   112679篇
  2005年   109310篇
  2004年   104488篇
  2003年   100077篇
  2002年   96642篇
  2001年   151593篇
  2000年   155408篇
  1999年   130460篇
  1998年   38442篇
  1997年   33950篇
  1996年   33980篇
  1995年   32037篇
  1994年   29595篇
  1993年   27753篇
  1992年   100290篇
  1991年   97390篇
  1990年   94621篇
  1989年   91163篇
  1988年   84010篇
  1987年   81917篇
  1986年   76832篇
  1985年   73712篇
  1984年   55368篇
  1983年   47063篇
  1982年   28336篇
  1979年   50468篇
  1978年   35804篇
  1977年   29829篇
  1976年   28422篇
  1975年   30177篇
  1974年   36449篇
  1973年   34746篇
  1972年   32739篇
  1971年   30656篇
  1970年   28509篇
  1969年   26941篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
BACKGROUND: Repairing dorsal nasal defects is a frequent challenge for dermatologic surgeons, mainly due to the high frequency of basal cell carcinomas on this site. Obvious scars, mismatched skin and distortion of the nasal contour are the surgical hazards that must be avoided in these cases. AIM: Our aim was to perform surgery involving a simple flap in order to repair medium to large defects on the dorsal side of the nose. METHODS: The dorsal horizontal advancement flap was studied in 12 patients, in order to evaluate the benefits and limits of this surgical procedure. RESULTS: The resulting scars on most of our patients were well-camouflaged among their natural skin lines, and there was neither distortion of the alar contour nor the nostril. CONCLUSIONS: This flap is easy to perform and, in selected cases, provides an outstanding alternative to second-intention healing, full-thickness skin grafts, transposition, rotation and pedicle flaps.  相似文献   
73.
74.
PURPOSE: The aim of this study was to determine if the concomitant use of ketorolac 0.4% and cyclosporin-A improves patient comfort during the induction phase in treating chronic dry eye disease. METHODS: Patients (n = 52) with clinically diagnosed dry eye were randomized to receive either cyclosporin-A monotherapy twice-daily (BID) or a BID adjunctive regimen of ketorolac, followed by the instillation of cyclosporin-A 10 min later. Study visits were at baseline, week 2, and week 6. At each study visit, patients underwent an evaluation for corneal staining, Schirmer's scores, and tear break-up time tests. Patients were asked to rate ocular comfort on a 4-point scale and to complete the ocular surface disease index (OSDI). Changes from baseline readings were recorded at week-2 and week-6 visits, and final patient success on treatment regimen was evaluated at week 6. RESULTS: After 6 weeks, the mean ocular comfort score of adjunctive patients improved 2.55 +/- 0.95 points, versus 1.53 +/- 0.91 points for monotherapy (P = 0.309). The adjunctive regimen provided significantly greater corneal staining reductions versus monotherapy, mean reduction in staining of 1.74 +/- 0.9, versus 1.27 +/- 0.56 (P = 0.044). CONCLUSIONS: Concurrent ketorolac 0.4% use with cyclosporin-A significantly reduced corneal staining and increased comfort in the induction phase.  相似文献   
75.
76.
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   
77.
78.
79.
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   
80.
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