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   1470篇
  免费   307篇
  2021年   16篇
  2020年   17篇
  2019年   103篇
  2018年   78篇
  2017年   74篇
  2016年   130篇
  2015年   91篇
  2014年   86篇
  2013年   319篇
  2012年   88篇
  2011年   98篇
  2010年   72篇
  2009年   52篇
  2008年   74篇
  2007年   68篇
  2006年   54篇
  2005年   19篇
  2004年   41篇
  2003年   35篇
  2002年   25篇
  2001年   22篇
  2000年   31篇
  1999年   6篇
  1998年   17篇
  1997年   20篇
  1996年   14篇
  1995年   19篇
  1994年   13篇
  1993年   4篇
  1992年   5篇
  1991年   3篇
  1990年   3篇
  1989年   3篇
  1988年   2篇
  1987年   3篇
  1986年   5篇
  1985年   5篇
  1984年   3篇
  1983年   4篇
  1982年   5篇
  1980年   5篇
  1979年   4篇
  1978年   6篇
  1977年   12篇
  1976年   3篇
  1975年   2篇
  1974年   3篇
  1972年   2篇
  1969年   2篇
  1968年   2篇
排序方式: 共有1777条查询结果,搜索用时 46 毫秒
991.
Ancient bones in a good preservation state, ascertained by microscopic techniques, conserve extracellular matrix proteins over thousands of years. With new techniques, intact extracellular matrix proteins from ancient bones and teeth are extracted and separated by one‐dimensional and two‐dimensional electrophoresis. Proteins were identified in Western blots by special antibodies against different human extracellular matrix (ECM) molecules of bone. We have confirmed different types of ECM human bone molecules such as osteonectin, osteopontin, and alkaline phosphatase with specific antibodies in human bone samples from different age groups. Additionally, we selected bone samples from different cultural time periods, such as the Middle Ages, the Bronze Age and the Late Pre‐Pottery Neolithic Phase (PPNB), and teeth from individuals from the Early Middle Ages and from the Late PPNB. The survival of intact extracellular matrix proteins in ancient bones and teeth dating from recent times to the Late PPNB, and reliable techniques to identify these proteins, present a great challenge to further research. A Match Set with PD‐Quest 7.2 shows that only 16% of protein spots in the teeth are also found in the bone of the same individual. In combination with the results of macro‐ and microscopic investigation, biochemical techniques will help us in obtaining a better understanding of bone and teeth in health and disease. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   
992.
This paper examines the osteological evidence for a case of long‐term labret use in pre‐Columbian north Chile and the pathological conditions associated with it. The burials from the site of Solcor 3 (AD 400–900) included a complete skeleton associated with two quartz labrets. Analysis of the skeleton of this adult male revealed wear and polish on the labial surface of both mandibular canines, indicating that the labrets were worn as a pair on either side of the midline of the lower lip. In addition to these abrasion facets, there were also areas of periosteal reaction in the alveolar bone of the canines. These patterns were analysed from the perspective of the clinical dentistry literature and compared to archaeological data. It is concluded that this individual's dental health was affected by wearing labrets, although not as seriously as might be expected based on contemporary medical reports. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   
993.
994.
995.
996.
REVIEW ESSAY     
Rednecks, Eggheads and Blackfellas: a study of racial power and intimacy in Australia. By Gillian Cowlishaw Sydney: Allen and Unwin. 1999. Pp. xix + 352. Figures, Maps, Photos & Index $35  相似文献   
997.
Biography as a genre of historiography had been dismissed for some years, criticized for being conservative, resistant to theoretical approaches, and hostile to methodological innovations. But the predominance of a historiography devoted to structures, functions, and statistics has, however, led to a renewed interest in the human factor in history. This paper argues that the pluralism of methods and theories which has emerged thereafter reopened the case for an innovative biography, thus facilitating the convergence of general history and the history of science.  相似文献   
998.
999.
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