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   466篇
  免费   38篇
  国内免费   17篇
耳鼻咽喉   3篇
儿科学   20篇
妇产科学   5篇
基础医学   50篇
口腔科学   44篇
临床医学   38篇
内科学   91篇
皮肤病学   16篇
神经病学   6篇
特种医学   94篇
外科学   52篇
综合类   27篇
预防医学   18篇
眼科学   7篇
药学   28篇
中国医学   1篇
肿瘤学   21篇
  2024年   1篇
  2023年   4篇
  2022年   1篇
  2020年   4篇
  2018年   11篇
  2017年   8篇
  2016年   12篇
  2015年   9篇
  2014年   6篇
  2013年   12篇
  2012年   10篇
  2011年   15篇
  2010年   18篇
  2009年   28篇
  2008年   8篇
  2007年   29篇
  2006年   4篇
  2005年   6篇
  2004年   8篇
  2003年   6篇
  2002年   8篇
  2001年   4篇
  2000年   8篇
  1999年   10篇
  1998年   22篇
  1997年   37篇
  1996年   32篇
  1995年   18篇
  1994年   16篇
  1993年   18篇
  1992年   1篇
  1991年   9篇
  1990年   4篇
  1989年   17篇
  1988年   19篇
  1987年   11篇
  1986年   13篇
  1985年   13篇
  1984年   8篇
  1983年   11篇
  1982年   6篇
  1981年   10篇
  1980年   8篇
  1979年   1篇
  1978年   5篇
  1977年   3篇
  1976年   4篇
  1975年   3篇
  1970年   1篇
  1969年   1篇
排序方式: 共有521条查询结果,搜索用时 0 毫秒
21.
The high incidence of injury in Rugby Union is well documented, particularly at elite levels of competition. This article describes the incidence and nature of all injuries sustained by elite Western Australian junior Rugby Union players during the 26 weeks up to and including the 1997 National Championship campaign. Informed consent was gained for each participant (n = 44) prior to completion of an extensive baseline questionnaire. Exposure and injury data were collected at each training session and game. The injury incidence rate over the 26 week period was 13.26/1000 player hours. Injury data were analysed by phase of play, position, severity and if occurred at games or training. The incidence of injury was significantly associated with the position played (chi2 = 67.49, p value = 0.008) and the phase of play in which the injury occurred (chi2 = 8.07, p value = 0.042). Tackling was the most dangerous phase of play (52% of injuries) and the most common site of injury was the lower limb (37%). Most injuries occurred during games (56%) and the flanker was the position most at risk of injury (12%). Further research is needed to identify the aetiology of injury at all levels of competition and to use these findings to develop effective injury prevention strategies in this sport. Position-specific risk factors should also be investigated, as should the mechanism of injury associated with tackling which is the phase of play in which significantly more injuries occur in rugby.  相似文献   
22.
23.
24.
OBJECTIVE: To examine the characteristics of infants suffering from failure to thrive in a community based cohort in Israel and to ascertain the effect of failure to thrive on their cognitive development. METHODS: By review of records maintained at maternal and child health clinics in Jerusalem and the two of Beit Shemesh, epidemiological data were obtained at age 15 months on a cohort of all babies born in 1991. For each case of failure to thrive, a matched control was selected from the same maternal and child health clinic. At age 20 months, cognitive development was measured, and at 25 months a home visit was carried out to assess maternal psychiatric status by questionnaire, and the HOME assessment was performed to assess the home environment. RESULTS: 3.9% of infants were found to have fallen below the third centile in weight for at least three months during the first year of life. Infants with failure to thrive did not differ from the general population in terms of obstetric or neonatal complications, birth order, or parents' ethnic origin, age, or years of education. The infants with failure to thrive did have lower birthweights and marginally smaller head circumferences at birth. Developmental assessment at 20 months of age showed a DQ of 99.7 v 107.2 in the matched controls, with 11.5% having a DQ below 80, as opposed to only 4.6% of the controls. No differences were found in maternal psychiatric problems as measured by a self report questionnaire. There were, however, significant differences in subscales of the HOME scale. CONCLUSIONS: (1) Infants who suffered from failure to thrive had some physiological predispositions that put them at risk; (2) failure to thrive may be an early marker of families providing suboptimal developmental stimulation.  相似文献   
25.
Wound bed preparation: a systematic approach to wound management   总被引:6,自引:0,他引:6  
The healing process in acute wounds has been extensively studied and the knowledge derived from these studies has often been extrapolated to the care of chronic wounds, on the assumption that nonhealing chronic wounds were simply aberrations of the normal tissue repair process. However, this approach is less than satisfactory, as the chronic wound healing process differs in many important respects from that seen in acute wounds. In chronic wounds, the orderly sequence of events seen in acute wounds becomes disrupted or "stuck" at one or more of the different stages of wound healing. For the normal repair process to resume, the barrier to healing must be identified and removed through application of the correct techniques. It is important, therefore, to understand the molecular events that are involved in the wound healing process in order to select the most appropriate intervention. Wound bed preparation is the management of a wound in order to accelerate endogenous healing or to facilitate the effectiveness of other therapeutic measures. Experts in wound management consider that wound bed preparation is an important concept with significant potential as an educational tool in wound management.
This article was developed after a meeting of wound healing experts in June 2002 and is intended to provide an overview of the current status, role, and key elements of wound bed preparation. Readers will be able to examine the following issues;
• the current status of wound bed preparation;
• an analysis of the acute and chronic wound environments;
• how wound healing can take place in these environments;
• the role of wound bed preparation in the clinic;
• the clinical and cellular components of the wound bed preparation concept;
• a detailed analysis of the components of wound bed preparation.
(WOUND REP REG 2003;11:1–28)  相似文献   
26.
27.
Computed tomography of abdominal fatty masses   总被引:2,自引:0,他引:2  
  相似文献   
28.
Relapsing polychondritis studied by computed tomography   总被引:1,自引:0,他引:1  
Mendelson  DS; Som  PM; Crane  R; Cohen  BA; Spiera  H 《Radiology》1985,157(2):489-490
Computed tomographic findings in a patient with relapsing polychondritis are described. Collapse of the cartilage of the nose and calcification in cartilages of the ears were clearly demonstrated. CT scanning was also helpful in evaluating the tracheobronchial tree for airway compromise, which could prove fatal in this condition.  相似文献   
29.
30.
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