Biology of the Arthropod Cuticle by Dr. Anthony C. Neville (auth.) PDF

By Dr. Anthony C. Neville (auth.)

Mention the phrases 'arthropod cuticle' to so much biologists and so they frequently galvanize a glazed expression. for the reason that the cuticle is often considered as an inert substance. it really is was hoping that this publication will dispel this fallacy. The examine of cuticle in its right context now contains a number of the wider features of biology that are presently fashionable (e. g. how a hormone like ecdyson induces a selected enzyme like dopa decarboxylase; the unsolved serious problem of phone gradient and polarity; the involvement of cyclic AMP in hormonal mechanisms; the additional­ mobile keep an eye on of cuticular enzymes, of the mechanical right­ ties of cuticle structural proteins, and of the orientation of fibrous molecules; and the relation of chromosome puffing to the synthesis of particular proteins). experiences on cuticle call for quite a few ideas, and examples of the next are illustrated during this booklet (fluorescence, part distinction, polariza­ tion and Nomarski interference microscopy; infrared absorp­ tion; transmission and scanning electron microscopy; autora­ diography analyzed by way of electron microscopy; unfavourable staining within the electron microscope; optical diffraction, excessive attitude X-ray diffraction, low attitude X -ray diffraction and chosen sector electron diffraction). i'm good conscious that the biophysical components of this booklet are much less incomplete than different facets. A developmental biologist or a biochemist could have extra elaborated different components ofthe material. just one prior writer, RICHARDS (1951)hasdevoted a e-book to arthropod cuticle.

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Extra info for Biology of the Arthropod Cuticle

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Legends see opposite page 29 WEIS-FOGH (1970) suggests that this results from a high density of reactive groups exposed on the surface of the completed cuticle. This could partly be due to enzyme action. What appears to have hitherto received no comment is the absence of cuticular material between the microvilli of the epidermal apical surface (Fig. 16). The material begins at a line drawn along the tips of the microvilli. There even appears to be a continuous structure running along this line.

1. Wax Canals (Epicuticular Filaments) Thus the 60 A diameter wax canals of LOCKE (1960a) traverse the outer and inner epicuticles, fusing to form pore canals in the latter layer. Hence each pore canal comes to contain several wax canal filaments. Because these filaments contain an esterase, LOCKE (1961) has suggested that wax may be synthesized in these canals in Calpodes, Galleria, Tenebrio and Apis. However, FILSHIE (1970 a, b) has shown by electron microscopy that in both Lucilia cuprina and 33 Calpodes ethlius the filaments survive prolonged acid hydrolysis (14 days in 36% HCI).

G. protein and chitin). TREHERNE (1961) has demonstrated the permeability of the basement membrane of nerve sheath to inulin. Hence, the deposition zone may not be simply converted into cuticle, but may exist as a long-term loose matrix through which cuticular macromolecules pass and become oriented on their way to the growing cuticle interface. Clearly a good deal of further research is needed on deposition zones, either directly or by chemical modelling experiments. 5. Ecdysial or Moulting Membrane and Moulting Fluid It has been emphasised (JENKIN and HINTON, 1966) that the event which begins an ecdysis is the separation of the epidermis from the inner face of the old cuticle (apolysis).

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