Download Biology of Fibrous Composites: Development beyond the Cell by Anthony Charles Neville PDF

By Anthony Charles Neville

ISBN-10: 0521410517

ISBN-13: 9780521410519

This publication tackles a tremendous unsolved challenge in developmental biology--how does chemistry create structure outdoor cells? The underlying speculation of this booklet is that the fibers are oriented by way of self-assembly simply outdoors the cells in the course of a cellular liquid crystalline section sooner than stabilization; the writer demonstrates that the most typical orientations of the fibers are plywood laminates (orthogonal and helicoidal), and as parallel fibers. eventually, he indicates that those will be imitated within the laboratory by means of liquid crystalline chemical compounds. Many fantastic pictures will reduction the initiated in spotting many of the sorts of fibers.

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Extra resources for Biology of Fibrous Composites: Development beyond the Cell Membrane

Example text

All are clockwise, and moreover they are clockwise in both left and right eyes. Replotted from Trelstad (1982), with curve for fuwl (Gallus domesticus) added from Coulombre and Coulombre (1975). The species of duck, carp, frog, and turtle are not named in the original. :: � "' "' c 0 g "' 100 Angular shif1 in degrees 200 understood by W. ]. Schmidt (1924), who had an enviable com­ mand of the use of polarizing optics. J Schmidt reasoned that this test could not consist solely of orthogonal layers of fibrils set at right angles; otherwise t n at 45• to both sets it would be possible to find a plane of secio of fibres such that these would not be disinguishable t between crossed polaroids.

8). Historically, such patterns were first drawn by Schulze (1863) from observa­ tions of cellulose (tunicin) fibres in sections of the test of a sea squirt

Collagen fibril directions were studied initially by an indirect method by Rosin (1946), who inferred the existence of an orthogonal arrangement from the positions of the pigmented processes of overlying melanophore cells. Overton (1976) exposed the underlying fibrils in the basement lamella of Pseudacris triseriata tadpoles by digestion of the overlying epidermal cells and basal lamina using trypsin. The fibril network could then be visualized using scanning electron microscopy. In a subsequent paper she first exposed the basal lamina of Xenopus laevis tadpoles with EDTA, and then removed it with hyaluronidase to reveal the collagen plies in the underlying basement lamella (Overton, 1979).

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Biology of Fibrous Composites: Development beyond the Cell Membrane by Anthony Charles Neville

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