Claim · model-written summary
In Valonia the cellulose chains of odd and even layers lie at a considerable angle, some 83°, to each other.
ValoniaVerbatim
e7“This has been demonstrated most clearly in the algae (e.g. Valonia, Cladophora, Chaetomorpha ), where the cellulose chains of odd layers, say, point in exactly the same direction, but at a considerable angle (some 83° in Valonia ) to the direction of those in the even layers”
Title
THE MOLECULAR CHAIN STRUCTURE OF CELLULOSE AND ITS BOTANICAL SIGNIFICANCE1
R. D. PRESTON Biological reviews/Biological reviews of the Cambridge Philosophical Society 1939. doi:10.1111/j.1469-185x.1939.tb00936.x
Other claims from this paper (9)
- Observation Cellulose consists of long molecular chains with a universally 1:4 linkage.
- Observation Cellulose chains are bound together by secondary valences (van der Waals forces) into bundles.
- Observation Pectin and lignin are deposited in the intermicellar spaces, whereas xylan hemicelluloses are intramicellar.
- Observation In most plant cells the cellulose chains of each secondary wall layer form a single spiral around the cell.
- Observation The sign and pitch of the cellulose spiral vary widely in some cell types.
- Observation In primary walls the cellulose chains form a spiral resembling that of the secondary wall.
- Recommendation The theories of wall growth based on transverse cellulose orientation in the primary wall must be abandoned.
- Mechanism Evidence points to a change in the inclination of an original spiral during growth.
- Mechanism The fundamental orienting mechanism of wall cellulose is thought to lie in the cytoplasm.