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Regulation of swelling of etiolated-wheat-leaf protoplasts by phytochrome and gibberellic acid (1983)

Blakeley, S. D. ; Thomas, B. ; Hall, J. L. ; [et al.]

Springer

Planta 158 (1983), S. 416-421

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ISSN: 1432-2048

Keywords: Gibberellin and protoplast swelling ; Phytochrome ; Protoplast (swelling) ; Triticum (protoplast swelling)

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The effect of light on the size of intact protoplasts isolated from the primary leaves of etiolated Triticum aestivum was studied. A 2-min red-light irradiation in the presence of 1 mM KCl was sufficient to cause a swelling of protoplasts compared with those maintained in darkness. The effect was photoreversible by far-red light over two light cycles, indicating the involvement of phytochrome. At 4°C, escape from reversibility occurred between 2 and 5 min after the exposure to red light. In exposure-response experiments, 20 s red light at 27 μmol m-2s-1 was sufficient to saturate the response. Exogenous gibberellic acid added in darkness in the presence of KCl also induced protoplast swelling. Gibberellins may act as an intermediate in the phytochrome-induced swelling of protoplasts.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00397734

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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.