Search results for "Secondary cell wall"
showing 3 items of 3 documents
Patterns of wall synthesis inSaccharomyces cerevisiae
1979
Wall formation inSaccharomyces cerevisiae seems to be the result of two main patterns of wall material deposition: (i) around the whole periphery of the cell in nonbudding ones, and (ii) mainly at the tip of the daughter cell or at the cross wall that separates dividing cells. This interpretation has been obtained following experiments in which RNA or protein synthesis has been inhibited. Under these conditions, glucan formation takes place, and wall thickening is probably due to the accumulation of this polysaccharide. Furthermore, once a pattern of wall deposition has been established, it is not modified by inhibition of RNA or protein synthesis.
Über die kinetik und den mechanismus der biosynthese der cellulose in den höheren pflanzen (nach versuchen an den samenhaaren der baumwolle)
1966
Abstract The quantity of cellulose synthesized on growing cotton bolls and the corresponding degree of polymerisation have been measured as a function of time. It was found that the biosynthesis proceeds in two distinct stages, beginning with a slow process yielding the “primary” cellulose with a non-uniform degree of polymerisation of about 2000–6000 followed by a more rapid process yielding a large amount of “secondary cellulose” with a high and uniform degree of polymerisation of about 14000 (mol. wt. 2.3·106). During the second stage the degree of polymerisation is independent of time. It is shown that the two kinds of cellulose correspond to the primary and secondary cell wall. In orde…
Neuere untersuchungen über größe und größenverteilung der β-glukosidischen ketten nativer cellulosen
1963
Der Polymerisationsgrad Pw der β-glukosidischen Ketten der Cellulose in unbehandelten Baumwollen verschiedener Herkunft liegt etwa zwischen 8500 und 9500. Die Molekulargewichtsverteilung zeigt 3 ausgepragte Maxima beim Polymerisationsgrad 11 500, 5500 und ca. 1500. Das letztere Maximum gehort wahrscheinlich zum Cellulosematerial der Primarwand, wahrend die beiden anderen Maxima dem Material der Sekundarwand angehoren. Die hohe Einheitlichkeit und der grose Mengenanteil des zum hochsten Maximum (bei P = 11 500) gehorenden Celluloseanteils legt es nahe, fur die biochemische Synthese der Cellulose einen POISSONmechanismus oder einen Matritzenmechanismus anzunehmen. Fasercellulosen aus anderen …