The action spectrum for the light-activated destruction of phytochrome in etiolated Avena seedlings has been determined. There are 2 broad maxima, one between 380 and 440 mmu, the other between 600 and 700 mmu. peaking at about 660 mmu. On an incident energy basis, the red region of the spectrum is more efficient than the blue by about one order of magnitude in activating phytochrome disappeara...

Electron transport activity at the cell surface of intact oat seedlings (Avena sativa L. cv Garry) was examined by measuring the oxidation and/or reduction of agents in the medium bathing the roots. Oxidation of NADH with or without added electron acceptors and reduction of ferricyanide by an endogenous electron donor were detected. The activities appear to be due to electron transfer at, or ac...

Corresponding author Marta José Avena Napoleão de Barros street, 754, São Paulo, SP, Brazil. Zip Code: 04024-000 [email protected] Escola Paulista de Enfermagem, Universidade Federal de São Paulo, São Paulo, SP, Brazil. Conflicts of interest: no conflicts of interest to declare. Abstract Objective: To develop and validate conceptual and operational definitions for the defining characteristics of...