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   1696694篇
  免费   123790篇
  国内免费   3782篇
耳鼻咽喉   21733篇
儿科学   55658篇
妇产科学   46166篇
基础医学   241419篇
口腔科学   48829篇
临床医学   151420篇
内科学   333948篇
皮肤病学   38662篇
神经病学   131239篇
特种医学   63922篇
外国民族医学   242篇
外科学   257375篇
综合类   38955篇
现状与发展   4篇
一般理论   531篇
预防医学   124281篇
眼科学   40221篇
药学   123743篇
  7篇
中国医学   4484篇
肿瘤学   101427篇
  2021年   12822篇
  2019年   13533篇
  2018年   19967篇
  2017年   15225篇
  2016年   16624篇
  2015年   18973篇
  2014年   26244篇
  2013年   37986篇
  2012年   52784篇
  2011年   55488篇
  2010年   32797篇
  2009年   30728篇
  2008年   51569篇
  2007年   54856篇
  2006年   55320篇
  2005年   52607篇
  2004年   50807篇
  2003年   48221篇
  2002年   46451篇
  2001年   91837篇
  2000年   93663篇
  1999年   77015篇
  1998年   19732篇
  1997年   17280篇
  1996年   17403篇
  1995年   16751篇
  1994年   15298篇
  1993年   14080篇
  1992年   57432篇
  1991年   55302篇
  1990年   53008篇
  1989年   50784篇
  1988年   46168篇
  1987年   44965篇
  1986年   42254篇
  1985年   40008篇
  1984年   29366篇
  1983年   24922篇
  1982年   13907篇
  1979年   25547篇
  1978年   17587篇
  1977年   14920篇
  1976年   13884篇
  1975年   14567篇
  1974年   17648篇
  1973年   16951篇
  1972年   15680篇
  1971年   14465篇
  1970年   13447篇
  1969年   12522篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
982.
983.
984.
985.
986.
987.
背景:Nissen胃底折叠术(Nissen fundoplication,NF)已不是治疗胃食管返流性疾病(gastroesophageal reflux disease,GERD)的唯一、有效的方法。对于能降低胃酸的手术方式来讲,如高选择性迷走神经切断术(highly selective vagotomy,HSV),也不仅仅是一种辅助治疗方法。对高选择性迷走神经切断术联合Nissen胃底折叠术(Nissen fundoplication with highly selective vagotomy,NFHSV)治疗GERD的作用目前尚无完整的评价。方法:2003年6月~2005年6月8例女性病人接受NFHSV,8例均有6个月GERD病史,经药物治疗症状无缓解,有餐前痛、消化性溃疡或严重的胃炎。平均随访时间12个月,术前、术后进行烧心严重程度评分测定(heart burn severity score,HSS)。结果:平均手术时间110min,无手术并发症。1例术后须用质子泵抑制剂,术后经戒烟5个月后停药。8例术后症状和烧心严重程度评分测定有明显改善。结论:NFHSV是有效的联合手术方式,尚需要进一步的研究证实这一联合术式的完全有效性和安全性。  相似文献   
988.
The present study was designed to evaluate the hypothesis that nebulised budesonide (NB) might be an alternative to systemic corticosteroids (SC) in the treatment of patients with exacerbations of chronic obstructive pulmonary disease (ECOPD). Patients hospitalised with ECOPD (n = 159) were randomised into three groups. Group 1 received only standard bronchodilator treatment (SBDT), group 2 received SC (40 mg prednisolone) plus SBDT, and group 3 received NB (1,500 microg q.i.d.) plus SBDT. Improvement during 10-day hospitalisation was compared with exacerbation and rehospitalisation rates after discharge. While mean+/-sd age was 64.1+/-8.9 yrs (female/male = 0.1), mean forced expiratory volume in one second (FEV(1)) at admission was found to be 37.2+/-12.2% predicted. Arterial blood gases and spirograms recovered faster in groups 2 and 3. While improvements in arterial oxygen tension (P(a,O(2))) and forced vital capacity (FVC) in group 2, and improvements in P(a,O(2)), FVC and FEV(1) in group 3, became significant at 24-h control, the first significant improvement in group 1 appeared in arterial oxygen saturation at 72-h control. The mean improvement of P(a,O(2)) after 10 days was 1.20 and 1.06 kPa (9 and 8 mmHg) higher in group 2 and 3, respectively, than in group 1. Blood glucose exhibited an upward trend only in group 2. The study demonstrates that nebulised budesonide may be an effective and safe alternative to systemic corticosteroids in the treatment of exacerbations of chronic obstructive pulmonary disease.  相似文献   
989.
To describe the treatment of a subchondral bone cyst in the proximal phalanx with parathyroid hormone peptide‐enriched fibrin hydrogel in a warmblood filly. The cyst was localized with computer‐assisted orthopaedic surgery, then curetted and finally filled with parathyroid hormone fragment peptide 1–34 (PTH1−34) covalently attached to a fibrin hydrogel. The cyst healed quickly without any complications. This result supports the hypothesis that PTH1−34 delivered locally in a fibrin hydrogel may improve the postoperative prognosis of surgical management of subchondral bone cysts in horses. Subchondral bone cysts are fairly common in horses. Especially in older horses, the prognosis is poor, even after surgical curettage. Therefore, different management protocols have been investigated in conjunction with surgical curettage to improve prognosis. Locally delivered PTH1−34 seems to be a new method in the treatment of subchondral bone cysts.  相似文献   
990.
Obstructive sleep apnoea is associated with increased blood pressure and other features of the metabolic syndrome. The aim of the present study was to determine the relative effectiveness of continuous positive airway pressure (CPAP) in modifying these outcomes. A randomised placebo-controlled blinded crossover trial comparing cardiovascular and metabolic outcomes after 6 weeks of therapeutic and sham CPAP was performed in 34 CPAP-na?ve patients (mean+/-SD body mass and respiratory disturbance indices were 36.1+/-7.6 and 39.7+/-13.8, respectively). Mean waking systolic and diastolic blood pressure fell by 6.7 and 4.9 mmHg, respectively, when compared with sham CPAP. No change was observed in glucose, lipids, insulin resistance or the proportion of patients with metabolic syndrome. In CPAP-compliant patients the fall in blood pressure was greater and the baroreceptor sensitivity improved significantly but no metabolic variable changed. In obese Caucasians with untreated obstructive sleep apnoea, continuous positive airways pressure can improve baroreceptor responsiveness and reduce waking blood pressure within 6 weeks, but this treatment period was insufficient to modify insulin resistance or change the metabolic profile. The mechanisms underlying this difference in the time course of blood pressure and metabolic response to continuous positive airway pressure in obstructive sleep apnoea requires further exploration.  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