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   862010篇
  免费   71623篇
  国内免费   1838篇
耳鼻咽喉   12805篇
儿科学   24643篇
妇产科学   25122篇
基础医学   124363篇
口腔科学   25493篇
临床医学   75429篇
内科学   164752篇
皮肤病学   16975篇
神经病学   70233篇
特种医学   35202篇
外国民族医学   171篇
外科学   136238篇
综合类   24648篇
现状与发展   2篇
一般理论   265篇
预防医学   66974篇
眼科学   20569篇
药学   64715篇
  1篇
中国医学   1593篇
肿瘤学   45278篇
  2018年   7347篇
  2015年   7732篇
  2014年   11119篇
  2013年   16814篇
  2012年   22745篇
  2011年   23866篇
  2010年   13886篇
  2009年   13076篇
  2008年   22604篇
  2007年   24662篇
  2006年   24521篇
  2005年   24164篇
  2004年   23724篇
  2003年   22855篇
  2002年   21944篇
  2001年   35839篇
  2000年   36483篇
  1999年   30925篇
  1998年   9235篇
  1997年   8554篇
  1996年   8482篇
  1995年   8020篇
  1994年   7731篇
  1992年   26685篇
  1991年   26121篇
  1990年   25645篇
  1989年   24696篇
  1988年   23245篇
  1987年   22899篇
  1986年   21772篇
  1985年   21130篇
  1984年   16397篇
  1983年   14010篇
  1982年   8863篇
  1981年   8217篇
  1980年   7683篇
  1979年   16761篇
  1978年   12129篇
  1977年   10203篇
  1976年   9348篇
  1975年   10159篇
  1974年   12655篇
  1973年   12151篇
  1972年   11552篇
  1971年   10690篇
  1970年   10240篇
  1969年   9921篇
  1968年   8903篇
  1967年   8240篇
  1966年   7658篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
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   
86.
87.
88.
89.

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   
90.
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