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   18498篇
  免费   1114篇
  国内免费   80篇
耳鼻咽喉   75篇
儿科学   412篇
妇产科学   217篇
基础医学   2303篇
口腔科学   734篇
临床医学   1842篇
内科学   4173篇
皮肤病学   384篇
神经病学   1956篇
特种医学   890篇
外科学   3000篇
综合类   108篇
一般理论   4篇
预防医学   1182篇
眼科学   126篇
药学   1234篇
中国医学   23篇
肿瘤学   1029篇
  2023年   139篇
  2022年   67篇
  2021年   354篇
  2020年   289篇
  2019年   404篇
  2018年   480篇
  2017年   453篇
  2016年   428篇
  2015年   496篇
  2014年   667篇
  2013年   1052篇
  2012年   1371篇
  2011年   1304篇
  2010年   814篇
  2009年   783篇
  2008年   1196篇
  2007年   1253篇
  2006年   1205篇
  2005年   1156篇
  2004年   994篇
  2003年   996篇
  2002年   926篇
  2001年   165篇
  2000年   100篇
  1999年   128篇
  1998年   170篇
  1997年   161篇
  1996年   122篇
  1995年   142篇
  1994年   141篇
  1993年   138篇
  1992年   105篇
  1991年   108篇
  1990年   93篇
  1989年   93篇
  1988年   86篇
  1987年   83篇
  1986年   75篇
  1985年   82篇
  1984年   72篇
  1983年   77篇
  1982年   76篇
  1981年   75篇
  1980年   58篇
  1979年   52篇
  1978年   61篇
  1977年   52篇
  1976年   44篇
  1975年   47篇
  1973年   31篇
排序方式: 共有10000条查询结果,搜索用时 199 毫秒
1.
Age-standardized cancer incidence has decreased over the last years for many cancer sites in developed countries. Whether these trends led to narrowing or widening socioeconomic inequalities in cancer incidence is unknown. Using cancer registry data covering 48 million inhabitants in Germany, the ecological association between age-standardized total and site specific (colorectal, lung, prostate and breast) cancer incidence in 2007 to 2018 and a deprivation index on district level (aggregated to quintiles) was investigated. Incidence in the most and least deprived districts were compared using Poisson models. Average annual percentage changes (AAPCs) and differences in AAPCs between deprivation quintiles were assessed using Joinpoint regression analyses. Age-standardized incidence decreased strongly between 2007 and 2018 for total cancer and all cancer sites (except female lung cancer), irrespective of the level of deprivation. However, differences in the magnitude of trends across deprivation quintiles resulted in increasing inequalities over time for total cancer, colorectal and lung cancer. For total cancer, the incidence rate ratio between the most and least deprived quintile increased from 1.07 (95% confidence interval: 1.01-1.12) to 1.23 (1.12-1.32) in men and from 1.07 (1.01-1.13) to 1.20 (1.14-1.26) in women. Largest inequalities were observed for lung cancer with 82% (men) and 88% (women) higher incidence in the most vs the least deprived regions in 2018. The observed increase in inequalities in cancer incidence is in alignment with trends in inequalities in risk factor prevalence and partly utilization of screening. Intervention programs targeted at socioeconomically deprived and urban regions are highly needed.  相似文献   
2.
3.
The set of guidelines for good clinical research practice in pharmacodynamic studies of neuromuscular blocking agents was developed following an international consensus conference in Copenhagen in 1996 (Viby-Mogensen et al., Acta Anaesthesiol Scand 1996, 40 , 59–74); the guidelines were later revised and updated following the second consensus conference in Stockholm in 2005 (Fuchs-Buder et al., Acta Anaesthesiol Scand 2007, 51 , 789–808). In view of new devices and further development of monitoring technologies that emerged since then, (e.g., electromyography, three-dimensional acceleromyography, kinemyography) as well as novel compounds (e.g., sugammadex) a review and update of these recommendations became necessary. The intent of these revised guidelines is to continue to help clinical researchers to conduct high-quality work and advance the field by enhancing the standards, consistency, and comparability of clinical studies. There is growing awareness of the importance of consensus-based reporting standards in clinical trials and observational studies. Such global initiatives are necessary in order to minimize heterogeneous and inadequate data reporting and to improve clarity and comparability between different studies and study cohorts. Variations in definitions of endpoints or outcome variables can introduce confusion and difficulties in interpretation of data, but more importantly, it may preclude building of an adequate body of evidence to achieve reliable conclusions and recommendations. Clinical research in neuromuscular pharmacology and physiology is no exception.  相似文献   
4.
5.
The global spread of antimicrobial resistance and the increasing number of immune‐compromised patients are major challenges in modern medicine. Targeting bacterial virulence or the human host immune system to increase host defence are important strategies in the search for novel antimicrobial drugs. We investigated the inflammatory response of the synthetic short antimicrobial peptide LTX21 in two model systems: a human whole blood ex vivo model and a murine in vivo peritoneum model – both reflecting early innate immune response. In the whole blood model, LTX21 increased the secretion of a range of different cytokines, decreased the level of tumour necrosis factor (TNF) and activated the complement system. In a haemolysis assay, we found 2.5% haemolysis at a LTX21 concentration of 500 mg/L. In the murine model, increased influx of white blood cells (WBCs) and polymorphonuclear neutrophils (PMNs) in the murine peritoneal cavity was observed after treatment with LTX21. In addition, LTX21 increased monocyte chemoattractant protein‐1 (MCP‐1). In conclusion, LTX21 affected the inflammatory response; the increase in cytokine secretion, complement activation and WBC influx indicates an activated inflammatory response. The present results indicate the impact of LTX21 on the host–pathogen interplay. Whether this will also affect the course of infection has to be investigated.  相似文献   
6.
7.
The European Journal of Health Economics - The aims of this study were to assess whether there is a conceptual overlap between the questionnaires HIT-6 and EQ-5D and to develop a mapping algorithm...  相似文献   
8.
Inflammation - Inflammasomes are intracellular protein complexes whose activation results in proinflammatory cytokines. Inflammasomes are implicated in Crohn´s disease (CD) pathogenesis, yet...  相似文献   
9.
10.
European Child & Adolescent Psychiatry - Previous studies have reported an increased risk of hospital-treated deliberate self-harm (DSH) in offspring who have lost a parent, but inconclusive...  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