منابع مشابه
Transduction mechanisms of vertebrate and invertebrate photoreceptors.
Vertebrate and invertebrate visual photoreceptors detect light with exquisite sensitivity and rapid kinetics. They can detect single photons and by adapting to background light respond to changes in illumination over broad ranges of intensity. This review outlines the quite different biochemical mechanisms by which vertebrate and invertebrate photoreceptors respond to light (Fig. 1). Photorecep...
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We have examined the role of Ca++ in phototransduction by manipulating the intracellular Ca++ concentration in physiologically active suspensions of isolated and purified rod photoreceptors (OS-IS). The results are summarized by the following. Measurement of Ca++ content using arsenazo III spectroscopy demonstrates that incubation of OS-IS in 10 nM Ca++-Ringer's solution containing the Ca++ ion...
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BLUF (sensor of blue light using FAD) domain-containing proteins are one of three types of flavin-binding, blue-light-sensing proteins found in many bacteria and some algae. The other types of blue-light-sensing proteins are the cryptochromes and the light, oxygen, voltage (LOV) domain-containing proteins. BLUF proteins control a wide variety of light-dependent physiological activities includin...
متن کاملEngineering aspects of enzymatic signal transduction: photoreceptors in the retina.
Identifying the basic module of enzymatic amplification as an irreversible cycle of messenger activation/deactivation by a "push-pull" pair of opposing enzymes, we analyze it in terms of gain, bandwidth, noise, and power consumption. The enzymatic signal transduction cascade is viewed as an information channel, the design of which is governed by the statistical properties of the input and the n...
متن کاملTransduction Gain in Light Adaptation of Rod Photoreceptors
Nikonov et al. (2000) recently reported a study of light adaptation in salamander rod photoreceptors. Analysis of their experimental data has led these investigators to conclude that elevation of the level of activated cGMP phosphodiesterase (PDE*) by background light, with a resulting decrease in the effective lifetime of cGMP, is the primary mechanism responsible for noncompressive desensitiz...
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ژورنال
عنوان ژورنال: Australian and New Zealand Journal of Ophthalmology
سال: 1996
ISSN: 0814-9763,1440-1606
DOI: 10.1111/j.1442-9071.1996.tb01562.x