853 resultados para Ancient Greek Thought


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Mode of access: Internet.

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With this is interleaved, I. Casaubon's Greek and Latin edition of the History in 3 v., Lipsiae, 1763-64, to form a set of 3 v.

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A collection of miscellaneous pamphlets.

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"The tales collected in this volume have, with one exception, appeared in the 'Tales from Greek mythology', 'The gods and heroes', and 'Tales of Thebes and Argos'."--Pref.

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Reprinted in part, from the Contemporary review. cf. Pref.

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Includes bibliographical footnotes.

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Bibliography: p. 249-251.

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"Works bearing on early Greek philosophy": page [123].

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"Note on the sources": p. 31-38.

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On verso of t.p.: University of Manchester publications, no. XLIII.

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Molecular investigation of the origin of colour vision has discovered five visual pigment (opsin) genes, all of which are expressed in an agnathan (jawless) fish, the lamprey Geotria australis. Lampreys are extant representatives of an ancient group of vertebrates whose origins are thought to date back to at least the early Cambrian, approximately 540 million years ago [1.]. Phylogenetic analysis has identified the visual pigment opsin genes of G. australis as orthologues of the major classes of vertebrate opsin genes. Therefore, multiple opsin genes must have originated very early in vertebrate evolution, prior to the separation of the jawed and jawless vertebrate lineages, and thereby provided the genetic basis for colour vision in all vertebrate species. The southern hemisphere lamprey Geotria australis (Figure 1A,B) possesses a predominantly cone-based visual system designed for photopic (bright light) vision [2. S.P. Collin, I.C. Potter and C.R. Braekevelt, The ocular morphology of the southern hemisphere lamprey Geotria australis Gray, with special reference to optical specializations and the characterisation and phylogeny of photoreceptor types. Brain Behav. Evol. 54 (1999), pp. 96–111.2. and 3.]. Previous work identified multiple cone types suggesting that the potential for colour vision may have been present in the earliest members of this group. In order to trace the molecular evolution and origins of vertebrate colour vision, we have examined the genetic complement of visual pigment opsins in G. australis.