Journal ArticleDOI
Red and far-red action on oxidative phosphorylation
Solon A. Gordon,Kenneth Surrey +1 more
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Impairment of ATP generation is suggested as the biochemical basis for the far-red potentiation of x-ray-induced chromatid aberrations and the photosensitivity of this phosphorylation suggests its consideration as a metabolic determinart of the photomorphogeneses controlled by red and far- red light.Abstract:
The rate of oxidative phosphorylation by isolated mitochondria was found to be affected by red (650 m mu ) and far-red (725 m mu ) light. Esterification of adenosine diphosphate to adenosine tripliosphate by rat liver mitochondria is decreased by concomitant or prior irradiation with far-red and increased by red light. The effect of far-red is reversible by red in an alternating sequence. An analogous sensitivity was not found when isolated mitochondria of the Avena seedling were irradiated. However, irradiation of the intact seedling significantly affected the phosphorylative capacity of the mitochondria subsequently isolated. Whether enhancement or inhibition of activity took place depended on the time at which the seedlings were irradiated in the post germinative period. There is apparently no direct correlation between radiationinduced changes in phosphorylative rate and either mitochondrial protein or volume. Impairment of ATP generation is suggested as the biochemical basis for the far-red potentiation of x-ray-induced chromatid aberrations. The photosensitivity of this phosphorylation also suggests its consideration as a metabolic determinart of the photomorphogeneses controlled by red and far-red light. (auth)read more
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Journal ArticleDOI
Primary and secondary mechanisms of action of visible to near-IR radiation on cells.
TL;DR: A cascade of reactions connected with alteration in cellular homeostasis parameters (pHi, [Cai], cAMP, Eh, [ATP] and some others) is considered as a photosignal transduction and amplification chain in a cell (secondary mechanisms).
Journal ArticleDOI
Photobiological fundamentals of low-power laser therapy
TL;DR: It is concluded that "laser biostimulation" is of aPhotobiological nature, and low-power laser effects can be related to well-known photobiological phenomena.
Journal ArticleDOI
Mitochondrial signaling in mammalian cells activated by red and near-IR radiation.
TL;DR: The present review examines the question whether radiation of visible and near‐IR (IR‐A) radiation can activate this retrograde‐type cellular signaling pathway and functions of cytochrome c oxidase as a signal generator and a signal transducer in irradiated cells.
Book ChapterDOI
Chromosome Aberrations Induced by Ionizing Radiations
TL;DR: Comparisons among different types of ionizing radiations and among similar radiation types having different energies for their capacity for producing chromosome aberrations are of considerable fundamental importance in the study of aberration production.
Journal ArticleDOI
Irradiation with He-Ne laser increases ATP level in cells cultivated in vitro.
TL;DR: The ability of monochromatic red light to induce an increase in the cellular ATP level was found to depend on the growth phase of the culture, being insignificant in the lag phase of cultured cells, increasing in the log phase of cultivated cells and reaching a maximum in cells at the late logarithmic and early plateau phase.
References
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Journal ArticleDOI
Photoperiodism in Plants
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Journal ArticleDOI
A method for the determination of tracer phosphate in biological material.
Journal ArticleDOI
Inactivation of oxidative and phosphorylative systems in mitochondria by preincubation with phosphate and other ions.
F. Edmund Hunter,Lillian Ford +1 more