Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Dark adaptation"”.
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Improving visibility of latent stains on dark fabric: dark adaptation and stroboscopic light sources
… to search for potential biological evidence. Dark adaptation has been suggested as a method to maximize benefits from fluorescent evidence examinations. Dark adaptation refers to the ways the human eye adapts to low light conditions through pupil dilation and rod cell activation. This study …
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Rod-cone interaction through flicker detection and the course of critical flicker frequency during dark adaptation
… functions are reported during the course of dark adaptation under various states of cone and rod adaptation. Also, measurements were made of the stimulus intensity necessary to just perceive flicker for a wide range of frequencies. The resulting data clearly demonstrate a rod-cone interaction …
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Advanced functional and intraoperative ophthalmic optical coherence tomography imaging
… layers after flash stimulus and subsequent dark adaptation. This finding could be used as a marker for photoreceptor health in retinal diseases that influence dark adaptation such as age-related macular degeneration. In the operating room, the ultrahigh speed system attaches to the operating …
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A new catoptric system in the eyes of penaeid shrimp
… pigment play an important role in light and dark adaptation. Absorbing pigments are believed to be melanins or ommochromes (Kleinholz, l96l), whereas the reflecting material by analogy with vertebrate systems, has long been considered to be guanine. More recently, it has been found to include …
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An investigation of the association of colonic adenomatous polyps and nutritional status of retinol and carotene
… assessment of beta carotene and retinol, and a dark adaptation test. One hundred male subjects were evaluated. Fifty-seven were found to have colonic adenomatous polyps. Cases and controls appeared to be well matched for demographic characteristics. There were no statistically significant …
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Molecular Dynamics and Quantum Chemistry Studies of the Protein Bacteriorhodopsin
… to describe the potential surface governing the dark adaptation of an ensemble of bacteriorhodopsins. The resulting rate of dark adaptation at room temperature k∼10-5s-1 and its 1000-fold enhancement through Asp-85 protonation are in agreement with experiment. The primary all-trans → 13- …
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The effects of circadian rhythms on visual thresholds
… at 0400h, 1000h, 1600h and 2200h in a 30 minute dark adaptation procedure using a von Békésy tracking method. Two experiments were performed; the first tested cone functions with a red 1 degree monochromatic test stimulus located ten degrees nasally. There were no sex differences for the ten male …
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The Effect of Once Daily Use of Brimonidine tartrate 0.15% solution on the Dark-adapted Pupil Size in Dark Brown Irides
… of brimonidine tartrate 0.15% solution on the dark-adapted pupil diameter with dark brown irides. METHODS: 25 normal volunteers without any medical past history or ocular pathology administered brimonidine tartrate 0.15% to their right eyes once daily for 3 weeks. Infrared pupil photographs …
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Evaluation of the visual pathway with ERG, mfERG and mfVEP in inherited eye disorders
… for the cones. However, after prolonged dark adaptation the rods recover completely. MfERG can be used for objective documentation of the disturbed macular function. Patients with retinitis pigmentosa may not always follow the typical natural course of the disorder with progressive loss …
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Effect of Melatonin and Dopamine in Site Specific Phosphorylation of Phosducin in Intact Retina
… and contributing to the process of light adaptation. Dopamine and melatonin are neuromodulators whose concentrations in the retina vary reciprocally during the circadian cycle, with dopamine high during the day and melatonin high during the night. Together, they control numerous aspects of …
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RATE-LIMITING STEP OF CONE PHOTOTRANSDUCTION RECOVERY AND OGUCHI DISEASE MECHANISMS
… reduction in kinase activity leads to a delayed dark adaptation, and is congruent with the night blindness phenotype observed in Oguchi disease patients. Finally, we have also investigated the role of post-translational isoprenylation on GRK1 function. We found that isoprenylation is required for …