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

By Dr. Anthony C. Neville (auth.)

Mention the phrases 'arthropod cuticle' to so much biologists and so they often galvanize a glazed expression. the reason is, the cuticle is usually considered as an inert substance. it's was hoping that this ebook will dispel this fallacy. The learn of cuticle in its right context now contains some of the wider features of biology that are at the moment fashionable (e. g. how a hormone like ecdyson induces a particular enzyme like dopa decarboxylase; the unsolved significant issue of mobilephone 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). reviews on cuticle call for quite a few ideas, and examples of the subsequent are illustrated during this ebook (fluorescence, part distinction, polariza­ tion and Nomarski interference microscopy; infrared absorp­ tion; transmission and scanning electron microscopy; autora­ diography analyzed via electron microscopy; unfavorable staining within the electron microscope; optical diffraction, excessive perspective X-ray diffraction, low attitude X -ray diffraction and chosen quarter electron diffraction). i'm good acutely aware that the biophysical components of this booklet are much less incomplete than different elements. A developmental biologist or a biochemist may have extra elaborated different components ofthe subject material. just one past writer, RICHARDS (1951)hasdevoted a ebook to arthropod cuticle.

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19. As for Fig. 2. I 8 but showing parabolic patterns derived from oblique sectioning of a helicoid 30 Q'2)J 2·18 2·19 Figs. 19. Legends see opposite page 31 endocuticle occurs and new outer and inner epicuticles and presumptive exocuticle are secreted. Throughout this stage the subsequent ins tar is said to be pharate within the preceding cuticle which is destined to be shed at ecdysis (HINTON, 1946). The term "moult" is therefore rather imprecise. Before these events occur, however, the ecdysial or moulting membrane appears.

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. In oocyte chorion deposition in Hyalophora cecropia, there is in fact a membrane overlying the microvilli of the maternal follicle cells (Fig. 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.

X 7,000) Fig. 7. As for Fig. 6 Fig. 8. Electron micrograph showing parabolic patterns arising from helicoidal chitin . crystallite orientation in cervical arthrodial membrane of adult Schistocerca gregaria. (x 50,000) Fig. 9. As for Fig. 8 but showing unidirectional orientation of chitin. (x 60,000) Fig. 10. Electron micrograph of abdominal intersegmental membrane from adult Schistocerca gregaria. ( x 5,000) Fig. 11. Electron micrograph of abdominal intersegmental membrane of one day old adult Hydrocyrius columbiae.

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