By Dr. Anthony C. Neville (auth.)
Mention the phrases 'arthropod cuticle' to so much biologists they usually often galvanize a glazed expression. for the reason that the cuticle is often considered as an inert substance. it truly is was hoping that this e-book will dispel this fallacy. The research of cuticle in its right context now contains some of the wider features of biology that are presently fashionable (e. g. how a hormone like ecdyson induces a particular enzyme like dopa decarboxylase; the unsolved serious problem of telephone gradient and polarity; the involvement of cyclic AMP in hormonal mechanisms; the additional mobile keep watch over 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 various concepts, and examples of the subsequent are illustrated during this booklet (fluorescence, section distinction, polariza tion and Nomarski interference microscopy; infrared absorp tion; transmission and scanning electron microscopy; autora diography analyzed by way of electron microscopy; adverse staining within the electron microscope; optical diffraction, excessive perspective X-ray diffraction, low perspective X -ray diffraction and chosen region electron diffraction). i'm good conscious that the biophysical elements of this e-book are much less incomplete than different facets. A developmental biologist or a biochemist might have extra elaborated different components ofthe subject material. just one prior writer, RICHARDS (1951)hasdevoted a publication to arthropod cuticle.
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Extra resources for Biology of the Arthropod Cuticle
17) (SMITH, TELFER, and NEVILLE, 1970). Most of our knowledge concerning the deposition zone has come from electron microscopy, and I do not propose here to discuss the many, and often conflicting, observations and speculations resulting from histochemical and staining studies. Mention will be made, however, of the suggestion of SCHMIDT (1956), who thought of the deposition zone as a subcuticle whose function was to glue the epithelium and cuticle together. LOCKE (1961) concluded that his electron microscope study gave an alternative explanation-that the subcuticle represented the innermost layer of the cuticle in the process of formation.
An alternative view of plaques is given below in the section on cellular attachment, in which I suggest that they resemble hemidesmosomes. Personally, I have to admit that I find both ideas attractive; perhaps attachment and secretion are in some way interelated? 4. Epicuticle, Shape and SU7jace Patterns It has long been known that the un stretched and folded epicuticle is responsible for the surface pattern of the abdomen in Rhodnius nymphs (WIGGLESWORTH, 1933) and female ticks (LEES, 1946), since such patterning is visible before the secretion of the underlying exocuticle.
There is evidence of impregnation in some cases (Fig. 11). The proteins of arthrodial membrane (see Chapter 3) have a distinctive amino acid composition (ANDERSEN, 1971 a). Since arthrodial membrane is an essential component of every joint between tanned sclerites (the very essence of an Arthropod), it deserves far more attention than it has received to date. 4. Ii'ansitional Cuticle The term "transitional cuticle" was coined by ANDERSEN and WEIS-FoGH (1964) to describe a cuticle which is intermediate in both physical and chemical properties between those of solid and rubberlike cuticles.
Biology of the Arthropod Cuticle by Dr. Anthony C. Neville (auth.)
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