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   3253093篇
  免费   240304篇
  国内免费   5693篇
耳鼻咽喉   44734篇
儿科学   106253篇
妇产科学   89768篇
基础医学   473891篇
口腔科学   89792篇
临床医学   296057篇
内科学   627585篇
皮肤病学   73013篇
神经病学   260188篇
特种医学   121703篇
外国民族医学   905篇
外科学   487604篇
综合类   72102篇
现状与发展   15篇
一般理论   1197篇
预防医学   257285篇
眼科学   75849篇
药学   238835篇
  11篇
中国医学   6860篇
肿瘤学   175443篇
  2021年   25759篇
  2019年   26584篇
  2018年   36913篇
  2017年   27790篇
  2016年   31382篇
  2015年   35243篇
  2014年   50046篇
  2013年   75091篇
  2012年   102831篇
  2011年   109810篇
  2010年   65006篇
  2009年   61559篇
  2008年   102241篇
  2007年   108751篇
  2006年   109918篇
  2005年   106694篇
  2004年   102264篇
  2003年   98092篇
  2002年   94729篇
  2001年   150359篇
  2000年   154124篇
  1999年   129243篇
  1998年   37795篇
  1997年   33440篇
  1996年   33498篇
  1995年   31634篇
  1994年   29193篇
  1993年   27419篇
  1992年   99463篇
  1991年   96576篇
  1990年   93882篇
  1989年   90437篇
  1988年   83291篇
  1987年   81312篇
  1986年   76238篇
  1985年   73168篇
  1984年   54940篇
  1983年   46682篇
  1982年   28126篇
  1979年   50102篇
  1978年   35585篇
  1977年   29643篇
  1976年   28269篇
  1975年   30011篇
  1974年   36247篇
  1973年   34538篇
  1972年   32545篇
  1971年   30480篇
  1970年   28357篇
  1969年   26824篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
73.
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   
74.
75.
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   
76.
77.
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   
78.
79.
80.
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