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   5549篇
  免费   476篇
  国内免费   25篇
耳鼻咽喉   58篇
儿科学   155篇
妇产科学   89篇
基础医学   767篇
口腔科学   188篇
临床医学   701篇
内科学   1066篇
皮肤病学   51篇
神经病学   389篇
特种医学   278篇
外科学   620篇
综合类   178篇
一般理论   3篇
预防医学   596篇
眼科学   103篇
药学   579篇
  1篇
中国医学   3篇
肿瘤学   225篇
  2022年   59篇
  2021年   91篇
  2020年   67篇
  2019年   85篇
  2018年   99篇
  2017年   76篇
  2016年   80篇
  2015年   97篇
  2014年   125篇
  2013年   205篇
  2012年   248篇
  2011年   246篇
  2010年   146篇
  2009年   146篇
  2008年   215篇
  2007年   279篇
  2006年   243篇
  2005年   230篇
  2004年   220篇
  2003年   216篇
  2002年   213篇
  2001年   209篇
  2000年   210篇
  1999年   148篇
  1998年   90篇
  1997年   92篇
  1996年   105篇
  1995年   72篇
  1994年   74篇
  1993年   67篇
  1992年   139篇
  1991年   127篇
  1990年   120篇
  1989年   103篇
  1988年   116篇
  1987年   100篇
  1986年   79篇
  1985年   73篇
  1984年   49篇
  1983年   44篇
  1982年   43篇
  1981年   49篇
  1980年   31篇
  1979年   49篇
  1978年   37篇
  1977年   52篇
  1976年   49篇
  1975年   28篇
  1973年   37篇
  1972年   39篇
排序方式: 共有6050条查询结果,搜索用时 0 毫秒
101.
102.
BackgroundPrivacy-related concerns can prevent equitable participation in health research by US Indigenous communities. However, studies focused on these communities'' views regarding health data privacy, including systematic reviews, are lacking.MethodsWe conducted a systematic literature review analyzing empirical, US-based studies involving American Indian/Alaska Native (AI/AN) and Native Hawaiian or other Pacific Islander (NHPI) perspectives on health data privacy, which we define as the practice of maintaining the security and confidentiality of an individual’s personal health records and/or biological samples (including data derived from biological specimens, such as personal genetic information), as well as the secure and approved use of those data.ResultsTwenty-one studies involving 3234 AI/AN and NHPI participants were eligible for review. The results of this review suggest that concerns about the privacy of health data are both prevalent and complex in AI/AN and NHPI communities. Many respondents raised concerns about the potential for misuse of their health data, including discrimination or stigma, confidentiality breaches, and undesirable or unknown uses of biological specimens.ConclusionsParticipants cited a variety of individual and community-level concerns about the privacy of their health data, and indicated that these deter their willingness to participate in health research. Future investigations should explore in more depth which health data privacy concerns are most salient to specific AI/AN and NHPI communities, and identify the practices that will make the collection and use of health data more trustworthy and transparent for participants.  相似文献   
103.
104.
105.
Using morpholino antisense oligonucleotide (MO) technology, we blocked leptin A or leptin receptor expression in embryonic zebrafish, and analyzed consequences of leptin A knock-down on fish development. Embryos injected with leptin A or leptin receptor MOs (leptin A or leptin receptor morphants) had smaller bodies and eyes, undeveloped inner ear, enlarged pericardial cavity, curved body and/or tail and larger yolk compared to control embryos of the same stages. The defects persisted in 6-9days old larvae. We found that blocking leptin A function had little effect on the development of early brain (1day old), but differentiation of both the morphant dorsal brain and retinal cells was severely disrupted in older (2days old) embryos. Despite the enlarged pericardial cavity, differentiation of cardiac cells appeared to be similar to control embryos. Formation of the morphants' inner ear is also severely disrupted, which corroborates existing reports of leptin receptor expression in inner ear of both zebrafish and mammals. Co-injection of leptin A MO and recombinant leptin results in partial rescue of the wild-type phenotype. Our results suggest that leptin A plays distinct roles in zebrafish development.  相似文献   
106.
Chromobacterium violaceum infection is rarely described in Southeast Asian children, which may be due partly to the lack of access to adequate microbiology facilities in many areas. This case report describes the first documented case to occur in a Cambodian child. An awareness of the disease and its manifestations is important as treatment can be difficult and may require prolonged courses of antimicrobials and surgery.  相似文献   
107.
108.
109.
110.
Bajwah S  Higginson IJ  Ross JR  Wells AU  Birring SS  Patel A  Riley J 《Lung》2012,190(2):215-220

Background  

This study aimed to assess the palliative care needs of progressive idiopathic fibrotic interstitial lung disease (PIF-ILD) populations in two London ILD centres.  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