Biomedical subjects
S P Rogers
Publications and source records attributed to S P Rogers.
Chromatic aftereffects associated with a night vision goggle simulation.
A visual perception experiment was conducted to determine the chromatic aftereffects of viewing a yellow-green field that simulated the display of current night vision goggles. Six females and two males served as subjects in a color-naming procedure. Subjects sequentially viewed an adaptation field, which was either yellow-green or white, and small colored targets presented on a CRT display. The time required to name the color of the targets was found to be dependent on the color of the adaptation field, the color of the target, and the interaction of these two variables. It was recommended that the effects of attenuation of the luminance of the night vision goggles be studied, and that color cockpit displays be redundantly coded whenever possible.
Selecting colour codes for a computer-generated topographic map based on perception experiments and functional requirements.
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Adrenalectomy and glucocorticoid administration in vivo do not affect production of 6-oxoprostaglandin F1 alpha by rat aortae.
1. Rats were bilaterally adrenalectomized and treated for periods of up to 32 days with doses of dexamethasone equivalent to physiological and supraphysiological endogenous glucocorticoid secretion. Aortic production of 6-oxoprostaglandin F1 alpha (6-oxo-PGF1 alpha) was measured by radioimmunoassay of the supernatant fluid from rings of aorta incubated in vitro. 2. Up to 32 days after adrenalectomy, neither adrenalectomy nor dexamethasone (2 micrograms/day and 20 micrograms/day) influenced aortic 6-oxo-PGF1 alpha production. 3. High doses of dexamethasone (60 micrograms/day for 6 days) in the presence or absence of mineralocorticoid (11-deoxycorticosterone, 600 micrograms/day) had no effect on aortic 6-oxo-PGF1 alpha production. 4. In contrast to the lack of effect of dexamethasone administered in vivo, incubation of aortic discs for 5 h with dexamethasone (1 mumol/l) in vitro caused inhibition of aortic 6-oxo-PGF1 alpha production to 23% of control levels. 5. Alteration in endogenous glucocorticoid secretion is unlikely to be involved in the physiological regulation of aortic 6-oxo-PGF1 alpha production.
Production of 6-oxo-prostaglandin F1 alpha and prostaglandin E2 by isolated glomeruli from normal and diabetic rats.
Production of 6-oxo-prostaglandin F1 alpha (6-oxo-PGF1 alpha) and prostaglandin E2 (PGE2) was measured by radioimmunoassay in supernatants of isolated glomeruli from rats with streptozocin-induced diabetes and non-diabetic rats. Production of 6-oxo-PGF1 alpha by discs of aortas from these rats was measured at the same time. As shown before, aortic discs from diabetic rats produced significantly less 6-oxo-PGF1 alpha than aortic discs from non-diabetic rats (diabetic 1.99 +/- SEM 0.27 ng v non-diabetic 2.92 +/- 0.46 ng/mg net weight aorta; p less than 0.05). In contrast production of 6-oxo-PGF1 alpha by isolated glomeruli was not reduced in the diabetic rats (diabetic 77 +/- 7 pg v non-diabetic 70 +/- 8 pg/micrograms glomerular DNA). Similarly production of PGE2 was not diminished in the diabetic glomeruli (diabetic 1.20 +/- 0.15 ng v non-diabetic 0.91 +/- 0.12 ng/microgram glomerular DNA). It is concluded that regional differences in production of prostacyclin and 6-oxo-PGF1 alpha occur in experimental diabetes. Diminished prostacyclin production may contribute to the increased susceptibility of diabetic patients to atherosclerosis but is less likely to have a role in the pathogenesis of microangiopathy.
Production of 6-oxo-prostaglandin F1alpha by rat aorta: influence of diabetes, insulin treatment, and caloric deprivation.
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Relation between judged and physical distance in multicue conditions as a function of instructions and tasks.
Using a rod adjustable in distance 48 Os produced equal depth intervals along a floor of a visual alley (interval reproduction) or bisected a given depth interval into two equal parts (bisection). Also, verbal reports were obtained of a depth interval located at a near and farther distance from O (absolute judgments). Two kinds of instructions, "apparent" and "objective," were used with different Os with each of the three tasks. There was an over-all tendency (p = .05 on two of three tasks) for apparent instructions to produce less over-constancy or more under-constancy of distance than that produced by objective instructions. This tendency is consistent with a cognitive interpretation of over-constancy of distance. Clear over-constancy was obtained only by the combination of objective instructions and the bisection task. Clear under-constancy was obtained only by the combination of apparent instructions and the method of absolute judgments. The reason for the effect of task on magnitude of distance constancy is not understood.
A Patty-Bear leg for amputation at the knee--or how to make a leg to fit a stump instead of a stump to fit a leg.
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A Patty-Bear leg for amputation at the knee--or how to make a leg to fit a stump instead of a stump to fit a leg. II. New principles.
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Straight nails in tibial fractures. Technique and report of thirty cases.
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Disconfusion, re discs and fusions. One man's experience in 23 years of solo practice.
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Disconfusion, re discs and fusions: one man's experience in 23 years of solo practice.
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A patty-bear leg for amputation at the knee--or how to make a leg to fit a stump instead of a stump to fit a leg. 3.
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