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   8582篇
  免费   533篇
  国内免费   28篇
耳鼻咽喉   144篇
儿科学   227篇
妇产科学   341篇
基础医学   1344篇
口腔科学   144篇
临床医学   763篇
内科学   1604篇
皮肤病学   89篇
神经病学   794篇
特种医学   355篇
外科学   893篇
综合类   58篇
一般理论   3篇
预防医学   809篇
眼科学   87篇
药学   789篇
中国医学   14篇
肿瘤学   685篇
  2021年   90篇
  2020年   56篇
  2019年   101篇
  2018年   125篇
  2017年   67篇
  2016年   95篇
  2015年   127篇
  2014年   189篇
  2013年   279篇
  2012年   385篇
  2011年   449篇
  2010年   226篇
  2009年   206篇
  2008年   414篇
  2007年   419篇
  2006年   435篇
  2005年   451篇
  2004年   441篇
  2003年   419篇
  2002年   356篇
  2001年   208篇
  2000年   164篇
  1999年   179篇
  1998年   109篇
  1997年   108篇
  1996年   117篇
  1995年   106篇
  1994年   102篇
  1993年   106篇
  1992年   157篇
  1991年   183篇
  1990年   146篇
  1989年   120篇
  1988年   127篇
  1987年   103篇
  1986年   102篇
  1985年   106篇
  1984年   115篇
  1983年   101篇
  1982年   78篇
  1981年   77篇
  1980年   81篇
  1979年   91篇
  1978年   64篇
  1977年   56篇
  1976年   71篇
  1975年   60篇
  1974年   82篇
  1973年   78篇
  1972年   55篇
排序方式: 共有9143条查询结果,搜索用时 15 毫秒
991.
992.
BackgroundImplicit bias (IB) is a pervasive phenomenon that negatively impacts health outcomes. IB is unconscious bias that operates at a level in which the individual is not aware of its existence. There is no requirement to include IB content in nursing education.PurposeWe sought to raise awareness of IB and its influence on health outcomes and support a discussion on ways to mitigate the impact of IB.MethodsThrough preparatory and interactive activities, students became familiar with IB and its effects on health outcomes, completed a self-assessment using the Implicit Association Test, and engaged in a faculty-facilitated discussion. This activity was implemented at four institutions in the United States and included 110 students at the BSN, MSN and DNP levels.ResultsThe activity received positive evaluations. A majority of students reported the preparatory learning activities were helpful, increased awareness of their biases and felt recognition of their IB would be helpful in managing their nursing care. Student narratives are also described in this report.ConclusionsInclusion of IB content in nursing education is acceptable to students and faculty. The content is best included at multiple points in the course of study.  相似文献   
993.
Approximately 10%-15% of couples are infertile, and a male factor is involved in almost half of these cases. This observation is due in part to defects in spermatogenesis, and the underlying causes, including genetic abnormalities, remain largely unknown. Until recently, the only genetic tests used in the diagnosis of male infertility were aimed at detecting the presence of microdeletions of the long arm of the Y chromosome and/or chromosomal abnormalities. Various other single-gene or polygenic defects have been proposed to be involved in male fertility. However, their causative effects often remain unproven. The recent evolution in the development of whole-genome-based techniques and the large-scale analysis of mouse models might help in this process. Through knockout mouse models, at least 388 genes have been shown to be associated with spermatogenesis in mice. However, problems often arise when translating this information from mice to humans.  相似文献   
994.
995.
996.
997.
Spike protein fusion peptide and feline coronavirus virulence   总被引:1,自引:0,他引:1  
Coronaviruses are well known for their potential to change their host or tissue tropism, resulting in unpredictable new diseases and changes in pathogenicity; severe acute respiratory syndrome and feline coronaviruses, respectively, are the most recognized examples. Feline coronaviruses occur as 2 pathotypes: nonvirulent feline enteric coronaviruses (FECVs), which replicate in intestinal epithelium cells, and lethal feline infectious peritonitis viruses (FIPVs), which replicate in macrophages. Evidence indicates that FIPV originates from FECV by mutation, but consistent distinguishing differences have not been established. We sequenced the full genome of 11 viruses of each pathotype and then focused on the single most distinctive site by additionally sequencing hundreds of viruses in that region. As a result, we identified 2 alternative amino acid differences in the putative fusion peptide of the spike protein that together distinguish FIPV from FECV in >95% of cases. By these and perhaps other mutations, the virus apparently acquires its macrophage tropism and spreads systemically.  相似文献   
998.
999.
Frostbite injuries rarely occur in healthy Dutch persons. However, as the number of people engaging in winter and outdoor activities and travelling to high altitudes increases, the risk of frostbite also increases. Frostbite is a cold-induced injury which results from two processes: freezing and microvascular occlusion. Adequate first aid, which focuses on the prevention of refreezing and mechanical injury, and rapid rewarming together with the administration of ibuprofen, are of the greatest importance for limiting eventual tissue damage. Iloprost infusion and possibly (r)tPA are indicated if a patient presents within 24 hours after the tissue has thawed and the injury is such that severe morbidity can be expected. If the patient presents after this time period, hyperbaric oxygen therapy may be considered; however, the evidence available on this type of treatment is limited.  相似文献   
1000.
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