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   178257篇
  免费   11800篇
  国内免费   703篇
耳鼻咽喉   2499篇
儿科学   4869篇
妇产科学   3435篇
基础医学   23192篇
口腔科学   3544篇
临床医学   17465篇
内科学   38182篇
皮肤病学   2801篇
神经病学   17939篇
特种医学   6212篇
外国民族医学   13篇
外科学   26472篇
综合类   2303篇
现状与发展   3篇
一般理论   201篇
预防医学   13273篇
眼科学   4778篇
药学   11515篇
中国医学   203篇
肿瘤学   11861篇
  2023年   641篇
  2022年   1027篇
  2021年   2862篇
  2020年   1762篇
  2019年   2885篇
  2018年   3397篇
  2017年   2453篇
  2016年   2861篇
  2015年   3454篇
  2014年   5108篇
  2013年   7879篇
  2012年   11387篇
  2011年   12249篇
  2010年   6836篇
  2009年   6305篇
  2008年   11530篇
  2007年   12296篇
  2006年   11800篇
  2005年   12162篇
  2004年   11555篇
  2003年   11026篇
  2002年   10635篇
  2001年   1485篇
  2000年   1125篇
  1999年   1590篇
  1998年   2329篇
  1997年   2021篇
  1996年   1703篇
  1995年   1583篇
  1994年   1423篇
  1993年   1352篇
  1992年   1040篇
  1991年   951篇
  1990年   833篇
  1989年   816篇
  1988年   839篇
  1987年   718篇
  1986年   836篇
  1985年   916篇
  1984年   1221篇
  1983年   1173篇
  1982年   1639篇
  1981年   1513篇
  1980年   1416篇
  1979年   786篇
  1978年   906篇
  1977年   802篇
  1976年   707篇
  1975年   566篇
  1974年   594篇
排序方式: 共有10000条查询结果,搜索用时 937 毫秒
31.
Journal of Thrombosis and Thrombolysis - Over the last few years data from our group have indicated that α-synuclein is important in development of immune cells as well as potentially...  相似文献   
32.
33.

Introduction

Invasive meningococcal disease (IMD) is a severe disease mainly affecting infants and young children. The most common serogroup causing IMD in Germany is the serogroup type B Neisseria meningitidis (MenB). The aim of the present study is to estimate the economic burden of MenB-related IMD in Germany.

Method

A bottom-up, model-based costing approach has been used to calculate the diagnose- and age-specific yearly lifetime costs of a hypothetical cohort of MenB-related IMD cases. Direct costs contain the treatment cost for the acute phase of the disease, long-term sequelae, costs for rehabilitation, and public health response. Indirect costs are calculated for the human-capital approach and the friction-cost approach considering productivity losses of patients or parents for the acute phase and long-term sequelae. Publicly available databases from the Federal Statistical Office, the SOEP panel data set, literature, and expert opinion were used as data sources. All future costs beyond the reference year of 2015 were discounted at 3%.

Results

The total costs for the hypothetical cohort (343 patients) from a societal perspective are €19.6 million (€57,100/IMD case) using the friction-cost approach and €58.8 million (€171,000/IMD case) using the human-capital approach. Direct costs amount to €18.6 million or €54,300 €/case. Sequelae are responsible for 81% of the direct costs/case.

Discussion

The elevated costs/MenB-related IMD case reflect the severity of the disease. The total costs are sensitive to the productivity-loss estimation approach applied. MenB is an uncommon but severe disease; The costs/case reflect the severity of the disease and is within the same magnitude as for human papilloma virus infections. The available literature on sequelae is due to the uncommonness limited and heterogeneous.  相似文献   
34.
35.
36.
37.
38.
39.
40.
Inbred mouse strains are the most widely used mammalian model organism in biomedical research owing to ease of genetic manipulation and short lifespan; however, each inbred strain possesses a unique repertoire of deleterious homozygous alleles that can make a specific strain more susceptible to a particular disease. In the current study, we report dystrophic cardiac calcinosis (DCC) in C.B‐17 SCID male mice at 10 weeks of age with no significant change in cardiac function. Acquisition of DCC was characterized by myocardial injury, fibrosis, calcification, and necrosis of the tissue. At 10 weeks of age, 38% of the C.B‐17 SCID mice from two different commercial colonies exhibited significant calcinosis on the ventricular epicardium, predominantly on the right ventricle. The frequency of calcinosis was more than 50% for mice obtained from Taconic's Cambridge City colony and 25% for mice obtained from Taconic's German Town colony. Interestingly, the DCC phenotype did not affect cardiac function at 10 weeks of age. No differences in echocardiography or electrocardiography were observed between the calcinotic and non‐calcinotic mice from either colony. Our findings suggest that C.B‐17 SCID mice exhibit DCC as early as 10 weeks of age with no significant impact on cardiac function. This strain of mice should be cautiously considered for the study of cardiac physiology.  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