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   898010篇
  免费   75388篇
  国内免费   3393篇
耳鼻咽喉   13169篇
儿科学   25341篇
妇产科学   25730篇
基础医学   127780篇
口腔科学   26194篇
临床医学   79838篇
内科学   169684篇
皮肤病学   17547篇
神经病学   72161篇
特种医学   36269篇
外国民族医学   173篇
外科学   139774篇
综合类   30342篇
现状与发展   19篇
一般理论   283篇
预防医学   70439篇
眼科学   21500篇
药学   68856篇
  52篇
中国医学   4018篇
肿瘤学   47622篇
  2018年   8678篇
  2016年   7742篇
  2015年   9340篇
  2014年   13042篇
  2013年   18911篇
  2012年   25886篇
  2011年   27058篇
  2010年   16203篇
  2009年   15050篇
  2008年   25053篇
  2007年   26897篇
  2006年   26532篇
  2005年   25992篇
  2004年   25077篇
  2003年   24088篇
  2002年   22953篇
  2001年   36247篇
  2000年   36857篇
  1999年   31157篇
  1998年   9480篇
  1997年   8753篇
  1996年   8636篇
  1995年   8147篇
  1994年   7849篇
  1992年   26792篇
  1991年   26224篇
  1990年   25717篇
  1989年   24759篇
  1988年   23315篇
  1987年   22970篇
  1986年   21825篇
  1985年   21174篇
  1984年   16462篇
  1983年   14066篇
  1982年   8932篇
  1981年   8263篇
  1980年   7712篇
  1979年   16781篇
  1978年   12159篇
  1977年   10223篇
  1976年   9350篇
  1975年   10179篇
  1974年   12675篇
  1973年   12160篇
  1972年   11567篇
  1971年   10705篇
  1970年   10237篇
  1969年   9927篇
  1968年   8921篇
  1967年   8248篇
排序方式: 共有10000条查询结果,搜索用时 421 毫秒
101.
102.
103.
104.
The special interest group on sensitive skin of the International Forum for the Study of Itch previously defined sensitive skin as a syndrome defined by the occurrence of unpleasant sensations (stinging, burning, pain, pruritus and tingling sensations) in response to stimuli that normally should not provoke such sensations. This additional paper focuses on the pathophysiology and the management of sensitive skin. Sensitive skin is not an immunological disorder but is related to alterations of the skin nervous system. Skin barrier abnormalities are frequently associated, but there is no cause and direct relationship. Further studies are needed to better understand the pathophysiology of sensitive skin – as well as the inducing factors. Avoidance of possible triggering factors and the use of well-tolerated cosmetics, especially those containing inhibitors of unpleasant sensations, might be suggested for patients with sensitive skin. The role of psychosocial factors, such as stress or negative expectations, might be relevant for subgroups of patients. To date, there is no clinical trial supporting the use of topical or systemic drugs in sensitive skin. The published data are not sufficient to reach a consensus on sensitive skin management. In general, patients with sensitive skin require a personalized approach, taking into account various biomedical, neural and psychosocial factors affecting sensitive skin.  相似文献   
105.
106.
107.
108.

Objectives

Short successive periods of skeletal muscle disuse have been suggested to substantially contribute to the observed loss of skeletal muscle mass over the life span. Hospitalization of older individuals due to acute illness, injury, or major surgery generally results in a mean hospital stay of 5 to 7 days, during which the level of physical activity is strongly reduced. We hypothesized that hospitalization following elective total hip arthroplasty is accompanied by substantial leg muscle atrophy in older men and women.

Design and participants

Twenty-six older patients (75 ± 1 years) undergoing elective total hip arthroplasty participated in this observational study.

Measurements

On hospital admission and on the day of discharge, computed tomographic (CT) scans were performed to assess muscle cross-sectional area (CSA) of both legs. During surgery and on the day of hospital discharge, a skeletal muscle biopsy was taken from the m. vastus lateralis of the operated leg to assess muscle fiber type–specific CSA.

Results

An average of 5.6 ± 0.3 days of hospitalization resulted in a significant decline in quadriceps (?3.4% ± 1.0%) and thigh muscle CSA (?4.2% ± 1.1%) in the nonoperated leg (P < .05). Edema resulted in a 10.3% ± 1.7% increase in leg CSA in the operated leg (P < .05). At hospital admission, muscle fiber CSA was smaller in the type II vs type I fibers (3326 ± 253 μm2 vs 4075 ± 279 μm2, respectively; P < .05). During hospitalization, type I and II muscle fiber CSA tended to increase, likely due to edema in the operated leg (P = .10).

Conclusions

Six days of hospitalization following elective total hip arthroplasty leads to substantial leg muscle atrophy in older patients. Effective intervention strategies are warranted to prevent the loss of muscle mass induced by short periods of muscle disuse during hospitalization.  相似文献   
109.
110.
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