Download e-book for kindle: International Review of Cytology, Vol. 8 by G.H. Bourne, J.F. Danielli (Eds.)

By G.H. Bourne, J.F. Danielli (Eds.)

ISBN-10: 0123643082

ISBN-13: 9780123643087

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And Felix, M. D. (1956) 1. Biophys. Biochem. Cytol. 2, 79. Dalton, A. , and Felix, M. D. Exptl. Biol. No. 10, 148. Dalton, A. , Kelly, M. , Lloyd, B. , and Striebich, M. J. (1949) J . Natl. Cancer Znst. 9, 439. Dalton, A. , Striebich, M. , and Lloyd, B. (1950) J . Natl. Cancer Znst. 11, 439. Deitch, A. , and Murray, M. R. (1956) J . Biophys. Biochem. Cytol. 2, 433. Dempsey, E. W. (1956) J. Biophys. Biochem. Cytol. 2, 305. Dempsey, E. , and Wislocki, G. B. (1955) J . Biophys. Biochem. Cytol. 1, 99.

The application of the method of X-ray diffraction analysis to cell walls had already, however, by that time placed the fundamentally fibrillar nature of cell walls beyond any possibility of doubt. It was clear that, particularly in elongated cells, the cellulose component consists of long molecular chains which, in certain regions at least of the wall, are arranged parallel to each other and spaced regularly the same distance apart in a space lattice ( Sponsler and Dore, 1926 ; Meyer and Mark, 1928 ; Mark and Meyer, 1929).

This is clear evidence of end synthesis. Wardrop and Dadswell (1952) have made a critical examination of the development of the secondary wall in the tracheids of several species of conifer and have reached the conclusion that here again the microfibrils are synthesized at their ends. Perhaps the most conclusive evidence concerns the development of extracellular microfibrils in the cellulose-producing bacterium Acetobacter xylinum. This has been the object of study for many years, and it has been repeatedly claimed that the appearance of microfibrils is preceded by the appearance of amorphous material with no observable intermediates.

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International Review of Cytology, Vol. 8 by G.H. Bourne, J.F. Danielli (Eds.)


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