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This study presents a synthesis of the evidence for modern archaeological, and palaeontological bioerosion of vertebrate tissue. It describes the first evidence for the bioerosion of modern, archaeological and fossil bird bones. A new form of bone bioerosion, known as Hackett tunnels, is defined. The bioerosion of vertebrate tissue by cyanobacteria and algae in modern marine and lacustrine environments is also described. Archaeological evidence indicates that the destruction of bone by bioerosion occurs in other terrestrial environments, such as cave deposits and middens. Bone from marine and lacustrine environments that appears to be macroscopically well preserved can have large amounts of microscopic fabric destruction. © 1997 John Wiley & Sons, Ltd.  相似文献   
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The grand spectacle of Britain's return of Hong Kong, its colony since the 1842 Treaty of Nanking, to Chinese sovereignty in July 1997 served to dramatize to a global audience the end of imperialism in its most overt political form. Beginning with China's defeat in the First Opium War in 1842, Britain and other European powers came to exercise varying degrees of forcible dominion, wrapped in a confusing array of legal guises, over parts of this proud but endangered country. Known to the Chinese ever since as the "unequal treaties," these agreements progressively infringed on China's sovereignty, administrative and legal integrity, and economic viability. Extraterritorial rights exempting foreigners from Chinese justice, treaty ports where administration was in the hands of foreigners, and foreign control of extensive portions of Chinese bureaucratic administration, including even the country's ability to collect revenue through the Maritime Customs Service—all became part of the elaborate edifice of extraordinary rights and privileges that the powers created for themselves in the name of the "great game" of empire in China.1  相似文献   
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Abstract. The politics of national identity in the Republic of Tatarstan are complex and often contradictory. Although sometimes posed in terms of an historical legacy, claims to nationhood are also strongly shaped by more pragmatic contemporary concerns. In addition to more conventional forms of political mobilisation, national identity is also contested in cultural arenas. Examining policies on language reform and media development, for example, sheds light on the processes through which a sense of national identity is currently being renegotiated in Tatarstan. The Republic's official multicultural policy is situated in the context of a range of distinct conceptions of Tatarstan's identity, from radical Islamic nationalism to a view of the republic as a Russian province.  相似文献   
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