. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Abb. 6. EM-Aufnahme von jodiertem Fichtenzellstoff(Faser- tracheide) mit Photometerkurve. Vergr. 120 000 â '. LiTERATUR 1. AssAF, A. C, Haas, R. A., und Purves, C. B., /. Am. Soc. 66, 59(1944). 2. Clark, G. L. und Parker, E. A., Science 85, 203 (1937). 3. Grasmann, W., Hofmann, U., und Nemetschek, Th., Z. Natiirforsch. 7 b. 509 (1952). 4. Harris, H. A. und Purves, C. B., Paper Trade J. 110, 29 (1940). 5. Hess, K., /. Colloid Sci. Suppl. 1, 143 (1954). 6. Hess, K. und Kiessig, H., Naturwiss. 31, 171 (1943). 7. â Z
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Abb. 6. EM-Aufnahme von jodiertem Fichtenzellstoff(Faser- tracheide) mit Photometerkurve. Vergr. 120 000 â '. LiTERATUR 1. AssAF, A. C, Haas, R. A., und Purves, C. B., /. Am. Soc. 66, 59(1944). 2. Clark, G. L. und Parker, E. A., Science 85, 203 (1937). 3. Grasmann, W., Hofmann, U., und Nemetschek, Th., Z. Natiirforsch. 7 b. 509 (1952). 4. Harris, H. A. und Purves, C. B., Paper Trade J. 110, 29 (1940). 5. Hess, K., /. Colloid Sci. Suppl. 1, 143 (1954). 6. Hess, K. und Kiessig, H., Naturwiss. 31, 171 (1943). 7. â Z. physik. Client. (A) 193, 196 (1944). 8. â Kolloid-Z. 130, 10 (1953). 9. Hessler, L. E. und Power, R. E., Textile Research J. 24, 822 (1954). 10. ScHMiTT, F. O., Hall, C. E., und Jakus, M. A., /. Cellular Camp. Physiol. 20, 11 (1942). 11. ScHWERTASSEK, K., Faserforsch. ii. Textiltech. 7, 251 (1952). 12. West. C. D., /. Chem. Phys. 15, 689 (1947). 13. WoLPERS, C, Klin. Wochschr. 11, 624 (1943). On the Submicroscopic Structure of Mannans H. Meier Swedish Forest Products Research Laboratory, Wood Chemistry Department, Stockholm In recent years the chemical structure of the hemi- celluloses has been cleared up to a large extent, but some concrete knowledge of their submicroscopic morphology is still lacking. The older literature states mostly that they are embedded together with the lignin as an amorphous cement between the cellulosic microfibrils of the cell walls. A more modern view of the matter distinguishes hemi- celluloses which are resistant and those which are nonresistant to acid hydrolysis, bearing in mind that the first are crystalline whilst the latter are amorphous. The difficulty in clearing up the submicroscopic morphology of the hemicelluloses resides in the fact that they are always combined with cellulose in the cell walls; there exists no method of separating them from each other without destroying the native bio- logical state of the hemicelluloses. However,
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