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   2471443篇
  免费   188439篇
  国内免费   7595篇
耳鼻咽喉   32696篇
儿科学   81177篇
妇产科学   67983篇
基础医学   352582篇
口腔科学   69018篇
临床医学   225818篇
内科学   489803篇
皮肤病学   57519篇
神经病学   203198篇
特种医学   97920篇
外国民族医学   541篇
外科学   370748篇
综合类   53543篇
现状与发展   5篇
一般理论   961篇
预防医学   198670篇
眼科学   55342篇
药学   177115篇
  8篇
中国医学   4203篇
肿瘤学   128627篇
  2018年   26334篇
  2017年   20610篇
  2016年   24304篇
  2015年   27417篇
  2014年   37183篇
  2013年   56197篇
  2012年   73133篇
  2011年   77553篇
  2010年   46802篇
  2009年   44745篇
  2008年   73375篇
  2007年   78683篇
  2006年   79186篇
  2005年   77672篇
  2004年   74202篇
  2003年   71965篇
  2002年   69256篇
  2001年   110395篇
  2000年   113076篇
  1999年   95260篇
  1998年   28421篇
  1997年   25520篇
  1996年   26283篇
  1995年   25706篇
  1994年   23928篇
  1993年   22486篇
  1992年   76748篇
  1991年   75125篇
  1990年   72718篇
  1989年   69684篇
  1988年   64547篇
  1987年   63507篇
  1986年   60027篇
  1985年   57680篇
  1984年   43908篇
  1983年   37669篇
  1982年   23233篇
  1981年   21010篇
  1979年   40989篇
  1978年   29956篇
  1977年   25235篇
  1976年   23179篇
  1975年   24904篇
  1974年   29660篇
  1973年   28778篇
  1972年   26879篇
  1971年   24999篇
  1970年   23201篇
  1969年   21828篇
  1968年   20468篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
55.
56.
The current situation in which the humanities are disparaged affects all university disciplines, including nursing, in whose historical evolution the humanities have always been present in one form or another. Looking beyond this disrepute, this study proposes that nursing renew its attention to classical philosophy. Specifically, it invites a close reading of Xenophon's Anabasis and Plato's Meno, to get three related goals: to show how the use of ancient texts are very valuable tools for the philosophical initiation of nursing students and can help them reflect on their choice of nursing as a practical activity; to reflect on the problem of virtue and the nature of the good life; and to show how the interaction with ancient texts allows students to reflect on questions and issues of life, theirs and others, that are not open to investigation through a purely scientific method. Consequently, both Anabasis and Meno readings strengthen the intellectual relationship between philosophy and nursing, enabling the latter to delve deeper into the key questions of its own thought as a discipline.  相似文献   
57.
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The...  相似文献   
58.
Prevalence of osteoporosis is more than 50% in older adults, yet current clinical methods for diagnosis that rely on areal bone mineral density (aBMD) fail to detect most individuals who have a fragility fracture. Bone fragility can manifest in different forms, and a “one-size-fits-all” approach to diagnosis and management of osteoporosis may not be suitable. High-resolution peripheral quantitative computed tomography (HR-pQCT) provides additive information by capturing information about volumetric density and microarchitecture, but interpretation is challenging because of the complex interactions between the numerous properties measured. In this study, we propose that there are common combinations of bone properties, referred to as phenotypes, that are predisposed to different levels of fracture risk. Using HR-pQCT data from a multinational cohort (n = 5873, 71% female) between 40 and 96 years of age, we employed fuzzy c-means clustering, an unsupervised machine-learning method, to identify phenotypes of bone microarchitecture. Three clusters were identified, and using partial correlation analysis of HR-pQCT parameters, we characterized the clusters as low density, low volume, and healthy bone phenotypes. Most males were associated with the healthy bone phenotype, whereas females were more often associated with the low volume or low density bone phenotypes. Each phenotype had a significantly different cumulative hazard of major osteoporotic fracture (MOF) and of any incident osteoporotic fracture (p < 0.05). After adjustment for covariates (cohort, sex, and age), the low density followed by the low volume phenotype had the highest association with MOF (hazard ratio = 2.96 and 2.35, respectively), and significant associations were maintained when additionally adjusted for femoral neck aBMD (hazard ratio = 1.69 and 1.90, respectively). Further, within each phenotype, different imaging biomarkers of fracture were identified. These findings suggest that osteoporotic fracture risk is associated with bone phenotypes that capture key features of bone deterioration that are not distinguishable by aBMD. © 2021 American Society for Bone and Mineral Research (ASBMR).  相似文献   
59.
Lasers in Medical Science - Studies reported the harmful effects of 2,4-D on body tissues, provoking changes in the anatomy and physiology of the kidneys, liver, and testicles. Thus, the objective...  相似文献   
60.
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