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   1381143篇
  免费   101006篇
  国内免费   2655篇
耳鼻咽喉   18163篇
儿科学   42701篇
妇产科学   36660篇
基础医学   208094篇
口腔科学   37600篇
临床医学   128661篇
内科学   268554篇
皮肤病学   30969篇
神经病学   111329篇
特种医学   53416篇
外国民族医学   265篇
外科学   193747篇
综合类   26236篇
现状与发展   6篇
一般理论   594篇
预防医学   110858篇
眼科学   31044篇
药学   103308篇
  6篇
中国医学   3439篇
肿瘤学   79154篇
  2021年   13607篇
  2019年   12752篇
  2018年   16933篇
  2017年   13129篇
  2016年   14998篇
  2015年   18224篇
  2014年   24097篇
  2013年   34563篇
  2012年   48148篇
  2011年   50069篇
  2010年   28887篇
  2009年   27225篇
  2008年   44733篇
  2007年   47010篇
  2006年   45903篇
  2005年   44694篇
  2004年   42361篇
  2003年   40138篇
  2002年   38471篇
  2001年   58469篇
  2000年   59291篇
  1999年   49870篇
  1998年   14204篇
  1997年   12825篇
  1996年   13091篇
  1995年   12321篇
  1994年   11440篇
  1992年   38829篇
  1991年   38248篇
  1990年   36963篇
  1989年   35701篇
  1988年   33073篇
  1987年   32409篇
  1986年   30792篇
  1985年   29072篇
  1984年   22147篇
  1983年   19339篇
  1982年   11469篇
  1979年   21124篇
  1978年   15520篇
  1977年   12886篇
  1976年   11957篇
  1975年   12913篇
  1974年   15705篇
  1973年   15460篇
  1972年   14590篇
  1971年   13623篇
  1970年   12844篇
  1969年   12114篇
  1968年   11278篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
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   
52.
We evaluated RNA stability of Ebola virus in EDTA blood and urine samples collected from infected patients and stored in West Africa’s environmental conditions. In blood, RNA was stable for at least 18 days when initial cycle threshold values were <30, but in urine, RNA degradation occurred more quickly.  相似文献   
53.
54.
55.
56.
57.
58.
59.
60.
Fluid is usually restricted during thoracic surgery, and vasoactive agents are often administered to maintain blood pressure. One-lung ventilation (OLV) decreases arterial oxygenation; thus oxygen delivery to the brain can be decreased. In this study, we compared phenylephrine and dopamine with respect to maintaining cerebral oxygenation during OLV in major thoracic surgery.Sixty-three patients undergoing lobectomies were randomly assigned to the dopamine (D) or phenylephrine (P) group. The patients’ mean arterial pressure was maintained within 20% of baseline by a continuous infusion of dopamine or phenylephrine. Maintenance fluid was kept at 5 mL/kg/h. The depth of anesthesia was maintained with desflurane 1MAC and remifentanil infusion under bispectral index guidance. Regional cerebral oxygen saturation (rScO2) and hemodynamic variables were recorded using near-infrared spectroscopy and esophageal cardiac Doppler.The rScO2 was higher in the D group than the P group during OLV (OLV 60 min: 71 ± 6% vs 63 ± 12%; P = 0.03). The number of patients whose rScO2 dropped more than 20% from baseline was 0 and 6 in the D and P groups, respectively (P = 0.02). The D group showed higher cardiac output, but lower mean arterial pressure than the P group (4.7 ± 1.0 vs 3.9 ± 1.2 L/min; 76.7 ± 8.1 vs 84.5 ± 7.5 mm Hg; P = 0.02, P = 0.02). Among the variables, age, hemoglobin concentration, and cardiac output were associated with rScO2 by correlation analysis.Dopamine was superior to phenylephrine in maintaining cerebral oxygenation during OLV in thoracic surgery.  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