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Biomedical subjects

J B Hall

Publications and source records attributed to J B Hall.

At least 109 records · Page 6Linked to original sources
PubMed1982

Bioadhesive and histotoxic properties of ethyl-2-cyanoacrylate.

Ethyl-2-cyanoacrylate was applied to the cortex of rabbits to evaluate its bioadhesive and histotoxic behavior. The animals were killed at 4 or 10 days. Half of the animals were pretreated with dexamethasone. Our results indicate that the application of ethyl-2-cyanoacrylate to brain tissue produced severe superficial cortical necrosis but not bioadhesion. Pretreatment with steroids did not provide a significant protective effect.

Adhesiveness↗
PubMed1979

Plasma glucose and lactic acid alterations in response to a stressful exam.

Changes in lactic acid and plasma glucose levels as a function of examination stress were measured using a 'pinprick' blood sampling method. Blood samples were obtained from 12 subjects at each of four times, one week prior to the exam, within 15 min pre-exam, within 15 min post-exam, and three weeks after the exam. Glucose was significantly elevated pre-exam over control times and decreased significantly from before to after the exam. Lactic acid was significantly elevated pre-exam over control times and increased significantly before to after the exam. It is suggested that changes in the levels of these metabolites in the blood are indicative of stress levels. Self-ratings of 'nervousness' were not significantly correlated with either pre-exam glucose or pre-exam lactic acid.

Adult↗
PubMed1977

Dissimilatory nitrate reduction in Clostridium tertium.

Fermentation balance studies were carried out on Clostridium tertium grown with and without nitrate in the medium. Nitrate reduction increased the efficiency of energy produced from glucose by permitting the utilization of additional sites of substrate level phosphorylation. The effect was even more dramatic in C. tertium than in C. perfringens, with increased cell yields of about 30% being observed in the former compared with 20% in the latter. Unlike C. perfringens, C. tertium responded to the presence of nitrate in the medium with an increased growth rate. A slight increase in the Y ATP of these cultures was also observed, and quantitatively, this appeared to be consistent with the prediction of Stouthammer and Bettenhaussen that Y ATP will vary with the growth rate. Thus, C. tertium, like C. perfringens, was able to use nitrate as an electron acceptor in conjunction with its energy metabolism, suggesting that this may be widespread among the nitrate-reducing anaerobes.

Adenosine Triphosphate↗
PubMed1975

The physiological function of nitrate reduction in Clostridium perfringens.

Fermentation-balance studies have been carried out on Clostridium perfringens grown in the presence and absence of nitrate in the medium. Nitrate is able to serve as an electron acceptor for these bacteria, permitting increased growth yields over those obtained in its absence. This increase is due to an increase in the proportion of metabolite molecules which can participate in substrate-level phosphorylation reactions when an inorganic acceptor is available. The nitrate reduction can be regarded as a primitive form of anaerobic respiration in these bacteria, since it is clearly coupled to their energy metabolism and is not assimilative in function. We believe that the existence of this kind of energy metabolism in these bacteria has significant evolutionary implications.

Acetates↗