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   2858841篇
  免费   215809篇
  国内免费   10490篇
耳鼻咽喉   37214篇
儿科学   93684篇
妇产科学   77210篇
基础医学   410408篇
口腔科学   80460篇
临床医学   267240篇
内科学   558503篇
皮肤病学   63690篇
神经病学   230356篇
特种医学   109381篇
外国民族医学   682篇
外科学   422226篇
综合类   65952篇
现状与发展   5篇
一般理论   965篇
预防医学   235186篇
眼科学   63557篇
药学   208070篇
  14篇
中国医学   6668篇
肿瘤学   153669篇
  2018年   31257篇
  2017年   24047篇
  2016年   27349篇
  2015年   30922篇
  2014年   42910篇
  2013年   65831篇
  2012年   85247篇
  2011年   91061篇
  2010年   54788篇
  2009年   51909篇
  2008年   84242篇
  2007年   89559篇
  2006年   90999篇
  2005年   87555篇
  2004年   83946篇
  2003年   80534篇
  2002年   77604篇
  2001年   132013篇
  2000年   135578篇
  1999年   113631篇
  1998年   33357篇
  1997年   29605篇
  1996年   30186篇
  1995年   29528篇
  1994年   27640篇
  1993年   25807篇
  1992年   92192篇
  1991年   90137篇
  1990年   87268篇
  1989年   83726篇
  1988年   77537篇
  1987年   75850篇
  1986年   72078篇
  1985年   69020篇
  1984年   52216篇
  1983年   44226篇
  1982年   26776篇
  1981年   23950篇
  1979年   47597篇
  1978年   34220篇
  1977年   28649篇
  1976年   27264篇
  1975年   28532篇
  1974年   34192篇
  1973年   32947篇
  1972年   30630篇
  1971年   28406篇
  1970年   26422篇
  1969年   24512篇
  1968年   23107篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
Knowing Ron     
Spechko  Phyllis L. 《JAMA》2006,296(7):738
  相似文献   
152.
Successful efforts in improving breastfeeding initiation rates at an urban teaching hospital prompted the hospital to create a lactation consultant (LC) position in the outpatient setting to focus on breastfeeding duration. This article reviews the complexity of the clinic setting, with the challenges and benefits of the consultant's first year in one of the hospital's outpatient clinics. Preliminary data collected by the consultant suggest that patients counseled by the LC in the outpatient clinic setting have longer breastfeeding duration rates.  相似文献   
153.
154.
OBJECTIVE: To compare infants' discomfort, nursing-time and caregiver preference, and assess the clinical efficiency (as a secondary outcome) of hood versus facemask nebulization in infants with evolving bronchopulmonary dysplasia (BPD) in the neonatal intensive care unit. STUDY DESIGN: A prospective, open, randomized, controlled crossover clinical trial. In total, 10 infants with BPD who were on inhaled beta-agonist bronchodilators and corticosteroids were randomly assigned to receive their nebulized treatments either by a facemask, or by a hood for 2-3 days, and then crossover to receive the same treatments with the other technique for another 2-3 days. Infants' discomfort, nursing-time, caregiver preference and clinical efficiency were compared. RESULTS: At baseline there was no significant clinical difference between the groups. Nurse-time required for administering the hood nebulization (mean+/-s.e.m.: 1.9+/-0.1 min) was significantly shorter than the time for mask nebulization (12.0+/-0.6 min, P<0.0001). Infants' discomfort score was significantly lower (0.1+/-0.04) for hood versus mask nebulization (2.5+/-0.2, P<0.0001). Nurses and parents unequivocally preferred the hood treatment. During both mask and hood nebulization therapies (2-3 days) clinical efficiency was comparable. While both methods caused an immediate (20 min post) clinical improvement, the immediate respiratory assessment change score was significantly greater for the hood versus the mask nebulization (0.62+/-0.27 versus 0.13+/-0.14, P<0.05). CONCLUSIONS: Nebulization of aerosolized medications in infants with evolving BPD by hood was less time-consuming for caregivers and was much better tolerated by the infants while being at least as effective as the conventional facemask nebulization.  相似文献   
155.
156.
157.
158.
BACKGROUND: Arterial hypertension and postmenopausal reduction of estrogen levels may be involved in modifications of the stiffness of large arteries. OBJECTIVES: To evaluate the pulse-wave velocity (PWV) and indirectly the arterial stiffness in hypertensive postmenopausal women submitted to hormone therapy with estradiol alone or combined with norethisterone acetate. SUBJECTS: Forty-five hypertensive postmenopausal women were double-blindly, randomly assigned to three arms of treatment: placebo (group I); estradiol 2 mg/day (group II); or estradiol 2 mg/day and norethisterone acetate 1 mg/day (group III). METHODS: Arterial stiffness was assessed from PWV measurements of the common carotid and femoral arteries (CF-PWV) and the common carotid and radial arteries (CR-PWV) obtained using the automatic Complior(R) device, taken at baseline and after 12 weeks of treatment. RESULTS: After the 12-week treatment, values of CF-PWV and CR-PWV were not significantly different (p = 0.910 and p = 0.736, respectively) among the groups. Systolic blood pressure showed a positive correlation with CF-PWV in groups II and III (p = 0.02 and p < 0.001, respectively). CONCLUSIONS: PWV and arterial stiffness in postmenopausal hypertensive women did not reduce over a 12-week treatment with estradiol alone compared with the same period of treatment with estradiol combined with norethisterone acetate.  相似文献   
159.
160.
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