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   2334279篇
  免费   186824篇
  国内免费   7291篇
耳鼻咽喉   30235篇
儿科学   76264篇
妇产科学   64582篇
基础医学   333882篇
口腔科学   64978篇
临床医学   215610篇
内科学   466204篇
皮肤病学   53699篇
神经病学   190888篇
特种医学   91280篇
外国民族医学   522篇
外科学   348717篇
综合类   52588篇
现状与发展   5篇
一般理论   931篇
预防医学   192108篇
眼科学   51444篇
药学   167741篇
  8篇
中国医学   3906篇
肿瘤学   122802篇
  2018年   24011篇
  2016年   21667篇
  2015年   24480篇
  2014年   34092篇
  2013年   51786篇
  2012年   66279篇
  2011年   71153篇
  2010年   43016篇
  2009年   41720篇
  2008年   67014篇
  2007年   71615篇
  2006年   72160篇
  2005年   70257篇
  2004年   67212篇
  2003年   65001篇
  2002年   62464篇
  2001年   106409篇
  2000年   109036篇
  1999年   91701篇
  1998年   27256篇
  1997年   24565篇
  1996年   25565篇
  1995年   25153篇
  1994年   23395篇
  1993年   21993篇
  1992年   75231篇
  1991年   73587篇
  1990年   71192篇
  1989年   68255篇
  1988年   63320篇
  1987年   62294篇
  1986年   58920篇
  1985年   56571篇
  1984年   43062篇
  1983年   36993篇
  1982年   22746篇
  1981年   20570篇
  1980年   19374篇
  1979年   40061篇
  1978年   29269篇
  1977年   24653篇
  1976年   22668篇
  1975年   24152篇
  1974年   28901篇
  1973年   28053篇
  1972年   26154篇
  1971年   24302篇
  1970年   22570篇
  1969年   21250篇
  1968年   19856篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
76.
77.
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   
78.
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   
79.
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   
80.
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   
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