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   570篇
  免费   6篇
  576篇
  2025年   3篇
  2024年   6篇
  2023年   5篇
  2022年   4篇
  2021年   8篇
  2020年   18篇
  2019年   19篇
  2018年   21篇
  2017年   15篇
  2016年   15篇
  2015年   17篇
  2014年   12篇
  2013年   36篇
  2012年   39篇
  2011年   29篇
  2010年   24篇
  2009年   37篇
  2008年   36篇
  2007年   31篇
  2006年   34篇
  2005年   30篇
  2004年   21篇
  2003年   27篇
  2002年   36篇
  2001年   9篇
  2000年   16篇
  1999年   9篇
  1998年   3篇
  1997年   1篇
  1996年   1篇
  1995年   2篇
  1994年   3篇
  1993年   1篇
  1992年   1篇
  1990年   3篇
  1985年   2篇
  1983年   1篇
  1982年   1篇
排序方式: 共有576条查询结果,搜索用时 0 毫秒
41.
    
The study of ancient DNA (aDNA) using molecular methods is an increasingly valuable tactic in bioarchaeology. While this method must be carefully undertaken to ensure that the molecules detected are representative of the ancient sample and not modern contaminates, there is a danger that a ‘one size fits all’ approach to validation will lead to misinterpretation and/or missed opportunities of valuable findings. When comparing human and pathogen aDNA, there are many shared technical means that can ensure best practice. However, there are a number of assumptions that should not be used for both scenarios. We discuss these aspects in reference to a recent article published by this journal and highlight some of the latest advances in molecular detection of ancient pathogen DNA that can further improve this endeavour. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   
42.
43.
    
Osteoporosis is a condition of reduced total bone mass per unit volume for the normal ratio of bone mineral to bone matrix. The present work deals with the investigation and evaluation of osteoporosis in ancient Egyptians of two social classes from the Old Kingdom in Giza. The aims of this study are to provide information about the lifestyle and health status of ancient Egyptians, and to detect the causes of osteoporosis. The material consisted of 74 skeletons (43 males and 31 females) from two different social classes (high officials and workers). Skeletons were excavated from the Giza Necropolis and belonged to the Old Kingdom (2687–2191 BC). Dual energy X‐ray absorptiometry (DEXA) was used to measure bone mineral density (BMD) at different skeletal sites (radius, fourth lumbar vertebra and head of femur). Moreover, scanning electron microscopy (SEM) was used to show the microarchitectural structure of the bone. Results showed a significant decrease of BMD values in old age groups compared with younger ones in both sexes. In addition, SEM of trabecular bone in osteoporotic cases demonstrated that the horizontal trabeculae were more affected than the vertical trabeculae. Comparison between high officials and workers revealed that osteoporosis was more frequent in male workers than in male high officials, and in female high officials than in female workers. An elevated prevalence of osteoporosis among male workers may be related to the effects of nutritional stress and excessive workload, while a sedentary lifestyle may have played a role in the occurrence of osteoporosis among female high officials. Moreover, osteoporosis occurs earlier and more frequently in females than males, which may be related to the hormonal changes that accompany the menopause in females. This study emphasises the importance of gender and lifestyle factors in influencing the severity of osteoporosis. Age‐related bone loss at most skeletal sites is noted in both sexes of ancient Egyptians. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   
44.
    
The spine can provide a large amount of information about an individual's physical condition and possible lifestyle through palaeopathological investigations. The aim of this research was to study spinal diseases among Greco‐Roman ancient Egyptians from Bahriyah Oasis, and to compare them with those from Giza of the Old Kingdom. The material used in the study included 809 single vertebrae and 77 adult sacra of ancient Egyptians from the Greco‐Roman period (332–30 BC) that were excavated from Bahriyah Oasis. The spinal elements were examined for pathological conditions, degenerative diseases, trauma, congenital abnormalities, infectious diseases and neoplasms. The most common lesions of the spine were those due to degenerative processes. The articular facets were more affected than the vertebral bodies. Compression fractures of the bodies, mostly due to osteoporosis, were found in 1.44% and 5.07% of thoracic and lumbar vertebrae respectively. The percentage of spina bifida occulta among ancient Egyptians from Bahriyah Oasis was 62.33%, while among those from Giza was only 3.33%. Few cases of lumbar spondylolysis and one case of DISH were recorded. No cases of infectious or neoplastic diseases were found. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   
45.
近年发掘的北赵晋国墓地为研究西周考古、历史等提供了极其宝贵的资料。该墓地中出土的大量铜器,引起了专家学者的广泛关注,研究成果涵盖很多方面,但仍有若干问题悬而未决,北赵墓地中墓主身份问题  相似文献   
46.
    
At the center of Sophocles’ Antigone is a struggle to reconcile personal beliefs with the needs or dictates of society. At no time is such a struggle more relevant than in periods of war, so it is not surprising that new adaptations of Antigone cluster around periods of armed conflict, whether between nations or within a single nation itself. In Luis Rafael Sánchez’s The Passion of Antígona Pérez (1968)—the subject of this essay—the nation or territory in question is one not typically featured in Western anthologies of drama: Puerto Rico, in the troubled possession of the United States.  相似文献   
47.
    
This article shows that over the course of the Warring States period (479–221 BCE) authors began to organize and categorize music in a manner that helped define and reinforce their conceptions of themselves as a distinct cultural or ethnic group: variously referred to as the Huaxia, Zhuxia, and Zhou. By examining how Ruist (Confucian) authors articulated distinctions among various types of music, and by showing how such identifications denigrated nefarious forms not associated with the Zhou court and its culture, I show how authors endeavored in a process of musical canonization while also consolidating a sense of an ethno-cultural self. The fact that these writings distinguished among and evaluated musical types not primarily through a discussion of musical form or theory but via a morally-laden language rooted in the civilizing rhetoric of the day suggests that music was a primary site for formulating, expressing, and promoting cultural identity.  相似文献   
48.
    
Recovered and amplified ancient DNA (aDNA), from a historically documented 19th century Upper Canadian pioneer cemetery produced genotypes that were used to infer a past societal kinship system. While the results from multiplex short tandem repeat (STR) amplifications showed an unreliable polymerase chain reaction (PCR) product, a single locus HUMTH01 analysis yielded reproducible data and an allelic frequency pattern not statistically different from modern populations. Mitochondrial (mt) DNA HVR II data showed that a combined cemetery database exhibited reduced haplotype diversity indicators, as well as clusters of probable maternally related burials. The chronological persistence and replacement of mtDNA clusters approximately every two generations suggests a patrilineal/patrilocal kinship structure from a virilocal burial program for the Harmony Road cemetery. Through the integration of the aDNA analysis with archaeological material culture, historic records, and other ethnohistoric sources of information, this conclusion is supported. In this study persisting patrilineally inherited surnames act as a surrogate for aDNA Y‐chromosome haplotype analysis. These results suggest that aDNA applications on aggregate skeletal collections where sparse, or no ethnological or historical documentation exists, may result in incorrect population history inferences if the presence of a kinship interment bias is not considered. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   
49.
  总被引:1,自引:0,他引:1  
Recent zooarchaeological studies on water buffalo (Bubalus sp.) remains from China and south Asia question the traditional view that water buffalo were first domesticated in Neolithic China over 7000 years ago. The results from several recent population genetic studies of modern domesticated buffalo (Bubalus bubalis) are not consistent with each other, placing the original center of buffalo's domestication in south Asia, southeast Asia, or China. This paper reports a study using an ancient DNA approach to analyze water buffalo remains from Neolithic sites in north China to investigate their affinities with modern domesticated water buffalo, and to shed light on the origin of modern domesticated water buffalo in China.A 169 bp fragment of D-loop mitochondrial DNA was successfully amplified and verified for 13 of 24 bone samples obtained from seven archaeological sites along the Wei River valley in Shaanxi Province, China. The bone samples which yielded positive DNA can be dated to 8000–3600 cal. BP. The phylogenetic analysis of the obtained DNA sequences along with modern water buffalo sequences indicated that the ancient water buffalos were not the direct ancestor of modern domesticated water buffalo. However, the phylogenetic analysis, along with BLAST searches of these ancient DNA sequences, did demonstrate their relatedness to water buffalo more so than to any other bovid species, confirming the existence of indigenous wild (but now extinct) water buffalo species (B. mephistopheles) in ancient China.The DNA analysis of these ancient remains failed to establish direct links between modern domesticated water buffalo (B. bubalis) and indigenous water buffalo (B. mephistopheles) from ancient China. If further DNA studies of more ancient remains from other regions of China confirm the observation of solely indigenous water buffalo species in ancient China, it would suggest modern water buffalo might not have been first domesticated in China.  相似文献   
50.
    
《History & Anthropology》2012,23(5):521-526
ABSTRACT

This essay considers how residential security and forensic genetics in South Africa open ways to think about captivity as something that the relatively privileged embrace to delineate a safe inside from a threatening outside. Captivity functions here as a means to entrench privilege and guarantee its protection.  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