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Articles 1 - 6 of 6
Full-Text Articles in Medicine and Health Sciences
Integration Of Cone Photoreceptor Signals In Macaque Lgn Neurons, Paul B. Brown
Integration Of Cone Photoreceptor Signals In Macaque Lgn Neurons, Paul B. Brown
All ETDs from UAB
Despite advances in the understanding of the primate visual system, much is yet to be learned about the way light signals sum to create our perception of the world. This is especially true at the simplest level of visual processing—the summation of two individual cone photoreceptor signals. How such signals combine to create visual perception has not been assessed in vivo. We used an adaptive optics scanning laser ophthalmoscope (AOSLO) to deliver binarized noise movies to identified groups of cones within the receptive fields of neurons in the macaque lateral geniculate nucleus (LGN). Recordings of neural action potentials within the …
The Role Of Protein Synthesis Attenuation And Eif2-Alpha Phosphorylation In Retinal Degeneration, Christopher Ryan Starr
The Role Of Protein Synthesis Attenuation And Eif2-Alpha Phosphorylation In Retinal Degeneration, Christopher Ryan Starr
All ETDs from UAB
Inherited retinal degeneration is a class of diseases in which there is no cure and very few treatment options available. An activated unfolded protein response has been detected in various animal models of retinal degenerative diseases. Several groups have found heightened activation of one pathway of the unfolded protein response in particular, the protein kinase R-like endoplasmic reticulum kinase signaling cascade, which converges on and phosphorylates the alpha subunit of eukaryotic translation initiation factor 2 to transiently halt protein synthesis and allow the cell to reestablish homeostasis. Although it is widely accepted that this signaling is inherently protective, hyperactivity or …
The Closed Eye As A Model For Dry Eye Disease, Cameron Kenneth Postnikoff
The Closed Eye As A Model For Dry Eye Disease, Cameron Kenneth Postnikoff
All ETDs from UAB
Every night, during sleep, the tears of the closed eye become significantly more inflammatory, with a notable influx of neutrophils. Preliminary studies suggested that these neutrophils were significantly different than blood-isolated neutrophils, with an increased concentration, upregulated surface expression of inflammatory membrane receptors, but inability to respond to inflammatory stimuli. The purpose of this dissertation was to better understand the contribution of this neutrophil population to ocular surface homeostasis and dry eye disease. Chapter One presents an introduction to the tear film and ocular surface, along with an introduction to dry eye disease and neutrophil biology. Chapter One also discusses …
A Microfocal Effect In Photoreceptor Light Capture, Vasantha Kumari Kanukuntla
A Microfocal Effect In Photoreceptor Light Capture, Vasantha Kumari Kanukuntla
All ETDs from UAB
In human eyes, accomodation brings light rays into focus on the retina in order to achieve a clear images. The plane of best focus within the depth of the retina is thought to be within the photoreceptor layer, but pinpointing the exact focal position axially has not been determined. With help of adaptive optics aberration correction and its ability to have microscopic control of a retinal stimulus, we explored how sensitive human subjects are to defocus on the micron scale. We found that focal position can be reliably judged within 0.02 D, which is equivalent to about 6 microns in …
Role Of Developmental Protein, Nudc, In The Retina, Skyler Boehm
Role Of Developmental Protein, Nudc, In The Retina, Skyler Boehm
All ETDs from UAB
Rod photoreceptors are the most prominent light sensitive cell in the retina of most mammals. The outer segments of photoreceptors contain the cellular machinery necessary for phototransduction to occur. The process of generating the phototransduction components occurs in the inner segment before being trafficked to the outer segment. These processes are highly regulated and require many different trafficking proteins and chaperones. The developmental protein nuclear distribution gene C (nudC) was found to be present in the photoreceptor, but its function is yet to be determined. Here we confirm that nudC is present in the retina and necessary in the photoreceptors. …
Intraocular Pressure Dynamics, Daniel Coleman Turner
Intraocular Pressure Dynamics, Daniel Coleman Turner
All ETDs from UAB
While cataracts (the leading cause of blindness worldwide) can be reversed surgical-ly, glaucoma is the leading cause of irreversible blindness, affecting over 70 million people worldwide [1]. Elevated intraocular pressure (IOP) and age are the primary risk factors for glaucoma [2] and lowering IOP is the only proven treatment for the disease [3]. IOP and its fluctuations affect nearly every aspect of ocular physiology and homeo-stasis, as well as playing a dominant role in glaucoma pathophysiology, yet very little is known about IOP due to the current clinical standard of measuring mean IOP during infre-quent clinic visits. We use a …