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Biomedical subjects

B Powell

Publications and source records attributed to B Powell.

At least 91 records · Page 5Linked to original sources
PubMed1980

Morphology and ultrastructure of an identified histamine-containing neuron in the central nervous system of the pond snail, Lymnaea stagnalis L.

An identifiable histamine-containing neuron is located on the anterior dorsal surface of the visceral ganglion of Lymnaea stagnalis L. After [3H]histamine was injected into the perikaryon of this neuron, labelled axonal ramifications were seen in the neuropils of all ganglia except the pedals and right cerebral, and labelled axons occurred in seven nerve trunks. Electron microscopical examination of the perikaryon of the histamine neuron revealed the presence of large aggregations of granulated vesicles (80-200 microns diameter), elaborate endoplasmic reticulum, and numerous mitochondria, Golgi complexes and lysosome-like organelles.

Animals↗
PubMed1979

Prospective use of saliva lithium determinations to monitor lithium therapy.

A mathematical equation (y = 2.27x -0.45) relating saliva (y) to plasma (x) lithium concentrations was previously determined by one of the authors. A prospective study is reported here in which the correlation coefficient between the predicted and the observed plasma concentrations in a new group of 25 patients was r = 0.89 (p less than 0.001). The study demonstrates that saliva lithium determinations can be safely used to monitor lithium therapy.

Bipolar Disorder↗
PubMed1978

The use of extracted teeth to evaluate clinical measurements of periodontal disease.

Clinical indicators of periodontal disease, Gingivitis Index, Gingival crevicular fluid and pocket depth measurements were obtained from the gingiva surfaces of 30 teeth. The gingival margins were marked on the surfaces of the teeth prior to extraction. The extracted teeth were stained with hematoxylin and air dried, and the distances from the groove to the base of the calculus, plaque, and connective tissue attachment were obtained. The plaque-free zone was also measured. Comparisons were made between clinical and tooth surface measurements. A high correlation was found between clinical pocket depth measurements and tooth surface parameters. The correlations between all tooth surface parameters and GCF were statistically significant. The G.I. was significantly correlated only with the penetration of calculus into the pocket. The clinical pocket depth was statistically the same as the distance from the gingival groove to the coronal connective tissue attachment. The plaque-free zone appeared to represent the junctional epithelium.

Dental Calculus↗