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We can observe a connection between some serious environmental problems caused by the overexploitation of environmental resources and the particular conceptions of property rights that are claimed to hold with regard to these resources. In this paper, I investigate whether Kant's conception of property rights might constitute a basis for justifying property regimes that would overcome some of these environmental problems. Kant's argument for the right to property, put forward in his Doctrine of right, is complex. In Section , I attempt an interpretation. Section works out the defining characteristics of the conception of property rights that Kant's argument establishes and investigates their implications for determining property regimes in environmental resources. Kant proposes a minimalist notion of the right to property as a triadic relation between persons with regard to an object, justified only on the condition that it is universalizable in the given circumstances. I argue that this notion offers a promising account for determining property relations with regard to environmental resources. By way of illustration, in Section , I focus on an example of Kantian property rights in one type of environmental resource: the marine fisheries.  相似文献   

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The evolution of the giant deer, Megaloceros giganteus (Blumenbach)   总被引:1,自引:0,他引:1  
The giant deer, Megaloceros giganteus , is best known from its fossil occurrences in Ireland around 11 000 years ago, but has a history across Europe and Western Asia spanning 300 000–400 000 years. This paper reports a biometric study of variation and evolution in the giant deer through its history. Most early populations were as large in body size as the Irish sample, but some were distincdy smaller and others had markedly shorter limbs. Thickened skull and mandibular bones, especially marked in males, are constant throughout die species' history. Some earlier populations had anders which were relatively smaller, more upright and differing in other details from the celebrated Irish specimens. Observed variation in body and antler form is discussed in terms of changing palaeoenvironments. Interpretation of the fighting or display roles of M. giganteus antlers needs to take account of their differing forms through time.  相似文献   

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本文从选题、文献资料的检索、课题的设计、基本操作技能培训、实验的原则、实验数据的处理、论文的撰写、答辩及答辩课件的制作等诸多环节入手,阐述了教师指导本科生毕业论文工作的一些方法、技巧,为指导高校毕业生毕业论文的实践工作提供参考。  相似文献   

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Bianchi  Thomas S. 《Biogeochemistry》2021,154(2):141-181
Biogeochemistry - The evolution of biogeochemistry, retraces the important historical steps in part, covered by Gorham (Biogeochemistry 13:199–239, 1991) in the 18–19th...  相似文献   

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A total of 248 individuals belonging to four populations of Caingang Indians from southern Brazil were stuided in relation to 23 genetic systems that are expressed in blood and one manifested on saliva. These results were compared with those obtained in 400 members of these same communities that were subjected to 11 body measurements. Nine polymorphic loci (MNSs, P, Rh, Duffy, Diego, Hp, PGM1, ESD, and Gc) were chosen for the calculation of the genetic distances between the four populations, which were compared with Mahalanobis's D2 differences. The two sets of values proved to be intercorrelated but neither showed a relationship with the geographic distances separating the four communities. The Caingang were previously classified linguistically as Gê, and they show several affinities with the Gê tribes, both when hematological, and morphological, characteristics are considered. A variant PGD phenotype is also described, showing a curious storage effect.  相似文献   

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I spell out and update the individuality thesis, that species are individuals, and not classes, sets, or kinds. I offer three complementary presentations of this thesis. First, as a way of resolving an inconsistent triad about natural kinds; second, as a phylogenetic systematics theoretical perspective; and, finally, as a novel recursive account of an evolved character (individuality). These approaches do different sorts of work, serving different interests. Presenting them together produces a taxonomy of the debates over the thesis, and isolates ways it has been (and may continue to be) productive. This goes to the larger point of this paper: a defense of the individuality thesis in terms of its utility, and an update of it in light of recent theoretical developments and empirical work in biology.  相似文献   

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Miller OK 《Mycologia》2003,95(1):176-183
Recent studies in the Gomphidiaceae have clearly delimited two genera, Gomphidius and Chroogomphus, both of which are mycorrhizal associates only with the Pinaceae. Ecological studies show Chroogomphus as a mycorrhizal associate of Pinus (Pinoideae), while Gomphidius is associated with the other three gymnosperm subfamilies Piceoideae, Lariceideae, and Abietoideae. The genus Brauniellula, which is based upon the secotioid habit and the presence of orthotropic, statismosporic basidia, falls within Chroogomphus in a clade with ballistosporic species. Brauniellula is, therefore, placed in synonymy with Chroogomphus. Molecular and morphological studies of new material from Nepal, Russia, Korea, and the United States have delimited two new species in each genus. The morphologically identical Chroogomphus rutilus clades are separate, one European and one North American. The relationship of the two genera in the Gomphidiaceae, with their mycorrhizal associates, is related to similar host relationships within other genera in the Suilloid Clade.  相似文献   

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…adaptation to bipedal locomotion decreased the size of the bony birth-canal at the same time that the exigencies of tool use selected for larger brains. This obstetrical dilemma was solved by delivery of the fetus at a much earlier stage of development. (Washburn1) …there can be no doubt that many of the obstetrical problems of Mrs. H. Sapiens are due to the combination of a narrower pelvis and a bigger head in the species. (Krogman2)  相似文献   

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Texton gradients: The texton theory revisited   总被引:4,自引:0,他引:4  
A brief outline of the texton theory was given in several review papers (Julesz and Bergen 1983; Julesz 1984a, b, 1985) without going into details. Here a more complete version of the texton theory is presented, with emphasis on the critical distances within which the density of textons is determined by the preattentive system. Particularly some recent findings by Sagi and Julesz (1985a, b) influenced the current version of the texton theory. The stimuli are restricted to drawing composed of line segments that permit a precise definition of neighborhoods and distances to which the line segments and texture elements have to be confined in order to quality for preattentive texture discrimination. These critical distances and the aperture of focal attention are scaled by the average size of the texture elements. Furthermore, it is stressed that even when the stimuli are restricted to line segments, the blobs outlined by line segments behave like textons. The preattentive system ignores the exact shape of these blobs, but is sensitive to their average width, length, and orientation.  相似文献   

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The CD95 receptor: apoptosis revisited   总被引:4,自引:0,他引:4  
CD95 is the quintessential death receptor and, when it is bound by ligand, cells undergo apoptosis. Recent evidence suggests, however, that CD95 mediates not only apoptosis but also diverse nonapoptotic functions depending on the tissue and the conditions.  相似文献   

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Micromeles Decaisne emend.Koehne (Rosaceae, Maloideae) is shown to be generically distinct fromSorbus L. emend.Crantz. Problems in the taxonomy of the genus are reviewed. The genus appears to be most closely related toRaphiolepis Lindl. but is readily distinguished by a constant set of characters. Both genera may be derived fromSorbus L. emend.Crantz subg.Aria Pers. Analysis of morphological characters is provided. A survey for flavonoids revealed the presence of vitexin and/or luteolin 7-O-glucoside in some members of the genus in a pattern similar to that found in certain Asian species ofSorbus. There are also brief taxonomic notes on some of the species which were examined.  相似文献   

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