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   2587870篇
  免费   184532篇
  国内免费   7568篇
耳鼻咽喉   34272篇
儿科学   85200篇
妇产科学   71570篇
基础医学   363581篇
口腔科学   69658篇
临床医学   234494篇
内科学   515504篇
皮肤病学   62450篇
神经病学   213453篇
特种医学   99882篇
外国民族医学   736篇
外科学   386414篇
综合类   50391篇
现状与发展   5篇
一般理论   968篇
预防医学   196177篇
眼科学   56663篇
药学   187988篇
  8篇
中国医学   5331篇
肿瘤学   145225篇
  2021年   19983篇
  2019年   20620篇
  2018年   29284篇
  2017年   22595篇
  2016年   26224篇
  2015年   29502篇
  2014年   40439篇
  2013年   60421篇
  2012年   80230篇
  2011年   84484篇
  2010年   51001篇
  2009年   49142篇
  2008年   79021篇
  2007年   83831篇
  2006年   85565篇
  2005年   81727篇
  2004年   78721篇
  2003年   76040篇
  2002年   73326篇
  2001年   128408篇
  2000年   131332篇
  1999年   110498篇
  1998年   31253篇
  1997年   27919篇
  1996年   28217篇
  1995年   27383篇
  1994年   25068篇
  1993年   23420篇
  1992年   85159篇
  1991年   81563篇
  1990年   78785篇
  1989年   76060篇
  1988年   69468篇
  1987年   67996篇
  1986年   63543篇
  1985年   60510篇
  1984年   44940篇
  1983年   37944篇
  1982年   22457篇
  1981年   19984篇
  1979年   38964篇
  1978年   27441篇
  1977年   23254篇
  1976年   21495篇
  1975年   22814篇
  1974年   26787篇
  1973年   25370篇
  1972年   23750篇
  1971年   21956篇
  1970年   20183篇
排序方式: 共有10000条查询结果,搜索用时 20 毫秒
151.
Clinical Rheumatology - Our aim was to determine reasons for admission, the prevalence and spectrum of infections, and the outcomes in a multiethnic cohort of hospitalized systemic lupus...  相似文献   
152.
153.

Objective

The teaching hospital of Nancy, France, implemented a specific multidisciplinary care pathway (French acronym AMDPL) to improve the management of patients presenting with Lyme borreliosis (LB) suspicion. We aimed to assess the first year of activity of this care pathway.

Patients and methods

We included all patients managed in the AMDPL pathway from November 1, 2016 to October 31, 2017. The first step was a dedicated Lyme disease consultation with an infectious disease specialist. Following this consultation, the LB diagnosis was either confirmed and adequate treatment was prescribed, or a differential diagnosis was established and patients received adequate management, or further investigations were required and patients were offered multidisciplinary management as part of a day hospitalization.

Results

A total of 468 patients were included. LB diagnosis was confirmed in 15% of patients (69/468), 49% of patients received a differential diagnosis, and 26% (122/468) of patients had the LB diagnosis ruled out without receiving any other diagnosis.

Conclusions

This is to our knowledge the first multidisciplinary center implemented in France for the management of patients presenting with LB suspicion related to polymorphous signs and symptoms. Several diagnoses could be confirmed or corrected, although some symptoms and complaints could not be explained. This cohort could improve our knowledge of LB and its differential diagnoses.  相似文献   
154.
BackgroundHepatopancreatobiliary (HPB) surgery fellowship training has multiple paths. Prospective trainees and employers must understand the differences between training pathways. This study examines self-reported fellowship experiences and current scope of practice across three pathways.MethodsAn online survey was disseminated to 654 surgeons. These included active Americas Hepato-Pancreato-Biliary Association (AHPBA) members and recent graduates of HPB, transplant–HPB and HPB–heavy surgical oncology fellowships.ResultsA total of 416 (64%) surgeons responded. Most respondents were male (89%) and most were practising in an academic setting (83%). 290 (70%) respondents underwent formal fellowship training. Although fellowship experiences varied, current practice was largely similar. Minimally invasive surgery (MIS) and ultrasound were the most commonly identified areas of training deficiencies and were, respectively, cited as such by 47% and 34% of HPB-, 49% and 50% of transplant-, and 52% and 25% of surgical oncology-trained respondents. Non-HPB cases performed in current practice included gastrointestinal (GI) and general surgery cases (56% and 49%, respectively) for HPB-trained respondents, transplant and general surgery cases (87% and 21%, respectively) for transplant-trained respondents, and GI surgery and non-HPB surgical oncology cases (70% and 28%, respectively) for surgical oncology-trained respondents.ConclusionsFellowship training in HPB surgery varies by training pathway. Training in MIS and ultrasound is deficient in each pathway. The ultimate scope of non-transplant HPB practice appears similar across training pathways. Thus, training pathway choice is best guided by the training experience desired and non-HPB components of anticipated practice.  相似文献   
155.
156.
157.
158.
159.
160.
Abstract

This study was undertaken to compare the concentrations of pro- and anti-angiogenic growth factors, nitric oxide (NO) stable metabolites in maternal serum and embryonic left ventricular (LV) isovolumic relaxation time (IRT, ms) during the first trimester in two groups of women: with pregnancy conceived by assisted reproductive technologies (ART, n?=?39) and normally conceived (control group, n?=?68) pregnancy. The concentration of vasoconstrictor endothelin 1 was 45.5 times more in ART than in control group. On the contrary, the concentrations of NO stable metabolites in ART were 1.9 times less than in control women. The assessment of angiogenic suppressors in ART women demonstrates the decrease in s-endoglin concentration was 1.6 times and in soluble receptor to vascular endothelial growth factor concentration was 2.0 times in comparison with control group. There was a significant increase in LV IRT in ART embryos in comparison to control ones. These data suggest significant changes in pro- anti-angiogenic factors balance and increase in vascular impedance in ART-conceived embryos.  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