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   665篇
  免费   43篇
  2023年   8篇
  2022年   3篇
  2021年   8篇
  2020年   21篇
  2019年   39篇
  2018年   32篇
  2017年   46篇
  2016年   43篇
  2015年   25篇
  2014年   25篇
  2013年   201篇
  2012年   22篇
  2011年   23篇
  2010年   26篇
  2009年   18篇
  2008年   13篇
  2007年   13篇
  2006年   9篇
  2005年   13篇
  2004年   8篇
  2003年   12篇
  2002年   7篇
  2001年   6篇
  2000年   7篇
  1999年   7篇
  1998年   4篇
  1997年   5篇
  1996年   3篇
  1995年   5篇
  1994年   2篇
  1993年   2篇
  1992年   2篇
  1990年   2篇
  1988年   2篇
  1987年   3篇
  1986年   1篇
  1985年   5篇
  1984年   3篇
  1983年   2篇
  1982年   2篇
  1981年   9篇
  1980年   3篇
  1978年   3篇
  1977年   1篇
  1976年   2篇
  1975年   2篇
  1974年   2篇
  1972年   2篇
  1971年   2篇
  1968年   2篇
排序方式: 共有708条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
55.
56.
57.
The domestic dog fulfills many functions for their human companions, such as hauling, guarding, and protection. Consequently, humans have taken dogs to nearly every corner of the globe. Recent translocations of Western dogs stemming from the Victorian era dog fancy have erased some of the ancient genetic signatures of these earlier migrations. Here we used DNA of ancient and modern dogs from the North American Arctic of Alaska and Greenland to assess their genetic continuity in time and space. We successfully sequenced 23 archaeological (ca. AD 1250–1910) and recent (ca. AD 1930–1990) surface-collected Canis bone and tooth samples and compared them to 51 modern Inuit Sled Dogs and to published sequences of modern Alaskan Malamutes (and additional Inuit Sled Dogs) to test for evidence of lineage replacement or genetic continuity through time. Ancient samples from Alaska and Greenland and modern sequences from Greenland all contained a high frequency of haplotype A31, which was previously described only in modern North American Arctic dogs. Thus, A31 was a common thread tying the entire North American Arctic together prior to European colonization and, in the Eastern Arctic, indicates genetic continuity between past and present dogs as well. However, A31 is rare in modern Alaskan dogs, consistent with post-colonization replacement by Eurasian matrilines.  相似文献   
58.
59.
60.
Wild(er)ness: Reconfiguring the Geographies of Wildlife   总被引:1,自引:0,他引:1  
Amidst millennial talk of the 'end of nature' ( McKibben 1989 ), this paper examines the precarious geographies of 'wildlife' in rather less apocalyptic terms. Animal (and plant) species designated wild are placed categorically outside the ambit of 'human society', confined to inhabiting the margins and interstices of the social world. Yet, we contend, such animals have long been routinely imagined and organized within multiple circuits of social power, which (re)configure them in important ways. These social orderings of animal life confound the moral geographies of wilderness, which presuppose an easy coincidence between the species and spaces of a pristine nature. In this paper, we employ the fluid spatial vocabulary of topology to map a more volatile and relational conception of the fabrics of wildlife. Our arguments are worked through glimpses of two historically very different social orderings of 'wild' animals – those associated with the military vernacular of the gladiatorial games of Imperial Rome, and the scientific vernacular of endangered species listing and conservation under CITES (the Convention on the International Trade in Endangered Species). These 'foldings' of wildlife in distant time/space aim to disrupt the linear historical narratives of 'civilization' and 'evolution', which consign wildlife to marginal spaces with a teleological destiny of erasure.  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