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Advances in Insect Physiology, Vol. 25 - download pdf or read online

By P. D. Evans

ISBN-10: 0120242257

ISBN-13: 9780120242252

Insect body structure is at present present process a revolution with the elevated program of molecular organic innovations to enquire the molecular mechanisms underlying the physiological responses to insect cells. Advances in Insect body structure has instituted a dedication to the book of top quality reports on molecular biology and molecular genetics in components the place they supply an elevated realizing of physiological approaches in bugs. quantity 25 comprises elevated assurance at the molecular biology of insect body structure.

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Extra resources for Advances in Insect Physiology, Vol. 25

Example text

It has been suggested that these fibres might be responsible for the interplanar spacings in IV crystals (Kelly and Robertson, 1973). The number of polypeptides associated with the virus particle appears to vary with the method used to prepare purified virions. For CIV, the number has been estimated at 19, ranging from 10 to 213kDa, with the major 65 kDa capsid polypeptide (Kelly and Tinsley, 1972) accounting for 40% of the total virion mass (Moore and Kelly, 1980). The IV22 and TIV capsid proteins have an estimated mass of 48-50 kDa, again comprising about 40% of the total virion mass (Kelly, 1985; Cameron, 1990).

The size, form and distribution of the spheroids also depends on the species of EPV. They range in shape from nearly spherical (Caleopteran hosts) to nearly ellipsoidal (Lepidopteran hosts). Generally, in the infected tissues of Coleoptera, one or more large spheroids develop per cell but in the Lepidoptera, numerous smaller spheroids are found in each cell. The amino acid content of the spheroids of several different EPVs (including AmEPV, E. , 1970; Langridge and Roberts, 1982). It was demonstrated that the acidic amino acids (aspartic and glutamic acids) and the basic amino acids (lysine and arginine) were present in approximately equimolar amounts.

No in vivo replication of insect IVs has been demonstrated in vertebrates (Kelly and Robertson, 1973). Often just one, or a few, obviously infected insects have been recovered from populations of many thousands of apparently healthy individuals (Kelly, 1985). This low frequency of overt infection in the environment contrasts with the high infectivity of virus particles when injected into the haemocoel, and has led to the suggestion that natural transmission of the virus may occur through wounds, by cannibalism or via parasitic nematodes (Ward and Kalmakoff, 1991).

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Advances in Insect Physiology, Vol. 25 by P. D. Evans

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