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By Karl Maramorosch; Edouard Kurstak

Comparative Virology presents an built-in comparability of viruses, in response to their chemical and morphological features. those descriptions won't in basic terms provide the reader a heritage but in addition a close research of some of the teams. In a few situations the teams are nonetheless host similar, as in terms of bacteriophages and polyhedral insect viruses. In others, for example in pox viruses, the gang contains viruses of vertebrates and invertebrates. The hosts of the bacilliform Rhabdovirales variety from guy and different warm-blooded vertebrates via invertebrate animals to vegetation. a different bankruptcy is dedicated to viruses with out protein-a crew that's of significant curiosity and that has just recently been well-known. on the grounds that there's ancient and useful curiosity in écologie groupings, reminiscent of arboviruses and oncogenic viruses, chapters on such teams have additionally been integrated.
The e-book opens with a dialogue at the class of viruses. Chapters facing DNA viruses and RNA viruses persist with, and the ecologically and disease-oriented teams whole the amount. it's was hoping that ""Comparative Virology"" may help carry solidarity to the technology of virology throughout the comparative process that's not depending on virus-host interactions. The mixed efforts of eminent participants to debate and review new details will expectantly gain all who're attracted to virology

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Evaluation of Characteristics In order to define taxons and classify viruses, should we use the "totality" of characteristics or, on the contrary be selective ? HT chose four characters. Gibbs et al. , 1 966, write that for them it is not possible to determine the relative importance of the different characters. " However, Mayr (1 965a) says in his excellent article "Numerical Phenetics and Taxonomy": "It is thus clear that Adanson . . did not propose that the taxonomist abandon his prerogative to evaluate the characteristics.

A. It is reasonable to place within the same species, the same genus, or the same family, two viruses differing by : 1 . The nature of the genetic material. 2. The symmetry of the capsid. 3. The number of capsomeres. 4. The naked or enveloped nature of the nucleocapsid ? B. Is it reasonable to bring together within the same species, the same genus or the same family, viruses differing by two, three, or four of the cited characteristics ? Once again, species, genus, and family are arbitrary categories, or con­ cepts, in the same way as the taxon virus is a concept.

76 --------d Ad 1 6, 2 1 Ad 1 1 Ad 7 Ad 1 2 Ad 1 8 R oo 3 J Shope pa p . P o l yo ma SV 40 H u ma n pa p . , •• ,. b i � H erpes HCM LK EAV Eotro m•U• Vacc i n ia CP/ R P F o w l pox J l] ]] Fm. 2. Bellett's classification. Double-stranded viruses. S, Cross-breeding serological reactions ; P, similar phenotypic properties. [With the author's permission, Bellett (1 967c) . ] used cross-breeding, which makes i t possible t o estimate the degree of homology of the nucleic acids. Bellett's method, supplemented by the utilization of phenotypic characters, enables to rediscover fifteen of the "groups" of the LHT system.

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