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The helix is a ubiquitous motif for biopolymers. We propose a heuristic, entropically based model that predicts helix formation in a system of hard spheres and semiflexible tubes. We find that the entropy of the spheres is maximized when short stretches of the tube form a helix with a geometry close to that found in natural helices. Our model could be directly tested with wormlike micelles as the tubes, and the effect could be used to self-assemble supramolecular helices. 相似文献
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R. Or G. Fishler M. Kehat CH. Chen Z. Klein E. Dunkelblum S. Gothilf LEA Muszkat VENEZIA Melamed-madjar SHOSHANA Yathom J. Halperin Z. Mendel O. Bonneh NITZA Saphir Y. Golan Z. Madar I. Moore R. Snir I. Harpaz MICHAL Mazor D. Becker T. Kimmel R. Cyjon A. Cosse M. Wysoki A. Hefetz D. Graur DALIA La-france A. Shani U. Ravid RUT Ideses VICTORIA Soroker ADA Rafaeli E. Nevo G. Heth A. Beiles J. C. Auffray 《Phytoparasitica》1987,15(2):155-164
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Bernstein Nirit Bar Tal Asher Friedman Haya Snir Pini Rot Ilona Chazan Amram Ioffe Marina 《Scientia Horticulturae》2006
No information is available today concerning the effect of irrigation with secondary treated sewage water on growth, production or quality of roses or other cut flowers. In the present study we investigated the effect of irrigation with treated sewage water on roses cultivated in two soil-less medium, perlite, an inert mineral medium and Choir (coconut fibers), an organic medium of high ion absorption capacity. During 12 months of exposure to the treated water, the visible appearance of the plants, their growth, the quantity and size of the flowering stems and their postharvest performance were not affected by the irrigation treatments. Contents of macroelements in the leaf tissues were unaffected by the irrigation with the secondary treated sewage water. At the same time, Cl contents increased 47% in perlite and 73% in Choir grown plants reaching levels characteristic of exposure to moderate salinity. Mn, Cu and B contents increased as well under cultivation in both perlite and Choir under irrigation with treated sewage water. On the other hand, contents of Fe, Zn, Mo and Al, were similar in all treatments. In all treatments contents of all the examined micro and macroelements were within the range accepted for proper plant function. 相似文献
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Iona Snir 《Scientia Horticulturae》1981,14(2):139-143
A method for the rapid propagation of raspberry (Rubus idaeus cultivar ‘Heritage’) is described, involving tip-culture, shoot elongation, multiplication by small cuttings, root initiation and transfer of plants to soil. 相似文献
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