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   1004256篇
  免费   77277篇
  国内免费   2636篇
耳鼻咽喉   13063篇
儿科学   34919篇
妇产科学   28634篇
基础医学   146587篇
口腔科学   27804篇
临床医学   90769篇
内科学   195206篇
皮肤病学   23134篇
神经病学   79520篇
特种医学   38683篇
外国民族医学   306篇
外科学   150320篇
综合类   24108篇
一般理论   391篇
预防医学   78302篇
眼科学   22972篇
药学   72664篇
  3篇
中国医学   2098篇
肿瘤学   54686篇
  2018年   10809篇
  2017年   8417篇
  2016年   9596篇
  2015年   10836篇
  2014年   14761篇
  2013年   22436篇
  2012年   29573篇
  2011年   31470篇
  2010年   18859篇
  2009年   17721篇
  2008年   29246篇
  2007年   31001篇
  2006年   31449篇
  2005年   30060篇
  2004年   29288篇
  2003年   28129篇
  2002年   27125篇
  2001年   47151篇
  2000年   48235篇
  1999年   40420篇
  1998年   11247篇
  1997年   10154篇
  1996年   10209篇
  1995年   9813篇
  1994年   9133篇
  1993年   8516篇
  1992年   32375篇
  1991年   31565篇
  1990年   31099篇
  1989年   29973篇
  1988年   27287篇
  1987年   27418篇
  1986年   25520篇
  1985年   24689篇
  1984年   18477篇
  1983年   15564篇
  1982年   9325篇
  1981年   8394篇
  1979年   16910篇
  1978年   12275篇
  1977年   10349篇
  1976年   9790篇
  1975年   10212篇
  1974年   12353篇
  1973年   11896篇
  1972年   10921篇
  1971年   10154篇
  1970年   9418篇
  1969年   8744篇
  1968年   8108篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
One unreported case of extended-spectrum-beta-lactamase (ESBL)-producing Salmonella enterica serovar Typhi was identified, whole-genome sequence typed, among other analyses, and compared to other available genomes of S. Typhi. The reported strain was similar to a previously published strain harboring blaSHV-12 from the Philippines and likely part of an undetected outbreak, the first of ESBL-producing S. Typhi.  相似文献   
112.
113.
114.
115.
Patients have become increasingly well informed with higher expectations to be involved in decision-making processes regarding their care and treatment. However, few studies have examined the impact of patient involvement on health care providers’ partnership-building communication. The aim of this study was to measure and explore the self-reported effects of patient involvement on the work of physicians and nurses. A questionnaire survey was distributed among cardiology staff in 12 Swedish hospitals (N = 488, response rate 67%). The sample was comprised of registered nurses (RNs, n = 303), licensed practical nurses (LPNs, n = 132), and physicians (MDs, n = 53). Confirmatory factor analysis was used to examine seven questionnaire statements concerning implications of patient involvement for one’s clinical work. Regression analyses were used to examine factors associated with staff’s partnership-building communication. Analysis confirmed two distinct factors accounting for 57% of the total variance, representing both negative—“Hassles”and positive—“Uplifts”aspects of patient involvement. Regression analyses revealed that only positive aspects (i.e., uplifts) of patient involvement predicted staff behavior aimed at involving patients. Working with actively involved patients may be a source of stress, both negative and positive, for health care professionals. By developing work routines for involving patients in their care, health care workplaces may help health care professionals to buffer the negative effects, and enhance the positive effects, of that stress.  相似文献   
116.
Gray platelet syndrome (GPS) is a rare (<1/1 000 000) and inherited platelet function disorder characterized by macrothrombocytopenia, α-granule deficiency, and hemorrhages. Bleeding intensity does not correlate with platelet count nor with functional test results. We hereby describe the perioperative bleeding prevention and management of a patient with GPS requiring multiple redo cardiac surgeries.  相似文献   
117.
118.
Die Ophthalmologie - Die Filtrationsverfahren sind im Gegensatz zu allen anderen Glaukomoperationen mit einer biomikroskopisch sichtbaren Wundheilung assoziiert, sodass eine Vielzahl von...  相似文献   
119.
120.

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   
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