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Cytochemical localization of ATPase activity in phloem tissues ofRicinus communis (1980)

Browning, A. J. ; Hall, J. L. ; Baker, D. A.

Springer

Protoplasma 104 (1980), S. 55-65

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ISSN: 1615-6102

Keywords: ATPase cytochemistry ; Phloem ; Ricinus communis

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Standard lead precipitation procedures have been used to examine the localization of ATPase activity in phloem tissues ofRicinus communis. Reaction product was localized on the plasma membrane of the companion cells associated with sieve elements and of parenchyma cells in phloem tissues from the leaf, petiole, stem and root. ATPase activity was also present on the plasma membrane and dispersed P-protein of sieve elements in petiole, stem and root tissue, but was absent from the plasma membrane of these cells in the leaf minor veins. Substitution ofβ-glycerophosphate for ATP produced no change in the localization of reaction product in leaf tissue. These findings are discussed in relation to current theories on the mechanism of sugar transport and phloem loading.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01279368

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Anionic polymerization to high vinyl polybutadiene (1981)

Halasa, Adel F. ; Lohr, D. F. ; Hall, J. E.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 1357-1360

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ISSN: 0360-6376

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 1,3-Butadiene was polymerized anionically to polybutadiene which contained up to 100% 1,2-addition product. The atactic 100% 1,2-polybutadiene was prepared with n-butyllithium modified with bis piperidino ethane. The polymerization was done in hexane solvent at -5 to +20°C polymerization temperature.

Additional Material: 2 Tab.