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Biomedical subjects

M Ring

Publications and source records attributed to M Ring.

11 recordsLinked to original sources
PubMed1992

Automated blood component preparation with the Opti system: three years' experience.

Removal of buffy coat from the red cell preparations reduces the content of microaggregates and leukocytes and decreases transfusion side effects. However, buffy coat removal is difficult to standardize when performed manually. An automated method using a new type of plastic container system, the Optipac, and a new type of device, the Optipress, greatly improves blood component production. An initial hard centrifugation of the original whole blood provides the best results, leaving approximately 20 ml of plasma and 0.5 x 10(9) leukocytes per unit of red cells suspended in 100 ml of an additive solution (SAG-M). Improved quality and standardization of the products, reduced technician time and better working conditions for the technician are the major advantages as compared to traditional manual technique.

Blood Component Removal↗
PubMed1992

Engineering and physics in dental technology. 1.

This work is a compilation of the principles of engineering and physics that are involved in the design and construction of various types of prostheses in the dental laboratory. It is intended as a reference of scientific doctrines for dental technicians who wish to advance their knowledge and skills. This article is the first of several that will be published in Trends & Techniques during the next several issues. The article in its entirety is by no means complete--the field is too enormous to identify all the tenets that apply, and future scientific advancement will certainly add others. Some elements of biomechanics are included in this work because of the interrelationship of biomechanics to engineering.

Dental Stress Analysis↗
PubMed1991

Recombinant cytochrome c peroxidase folds properly without conformational "annealing".

Recombinant cytochrome c peroxidase isolated from Escherichia coli has recently been reported to exhibit an abnormal electronic absorption spectrum that is converted to the normal spectrum after conformational "annealing" of the recombinant enzyme by passage over a cytochrome c affinity column. The current report provides evidence that the abnormal spectrum observed in some preparations of recombinant cytochrome c peroxidase arises from the presence of contaminant, damaged forms cytochrome c peroxidase with altered spectra. Removal of these contaminant forms produces a major cytochrome c peroxidase fraction with a normal spectrum. We conclude that elution of recombinant cytochrome c peroxidase over a cytochrome c affinity column does not produce normal enzyme through conformational "annealing" but that it produces purified enzyme through removal of contaminants.

Chromatography, Affinity↗
PubMed1979

Detection of environmental depigmenting substances.

We systematically screened the depigmenting capacity of several phenols, catechols and organic antioxidants. Clear-cut depigmentation was achieved with monomethyl ether of hydroquinone (MMH) and tertiary butyl catechol (TBC) using black guinea pigs and black mice as animal models. A goal was to establish a reliable in vivo method to demonstrate or to predict the depigmenting action of chemicals on mammalian melanocytes. There was no universal solvent or optimal body site, although all tested areas could be depigmented. Irritation induced by some vehicles and test materials produced false positive responses. False negative responses with known depigmenting chemicals were observed. Utilizing these observations, we propose a model for screening medicinal and industrial chemicals for depigmenting capacity.

Animals↗
PubMed1979

And up.

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Dentures↗
PubMed1976

Remember the Alamo!

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Laboratories, Dental↗
PubMedDate not supplied

Engineering and physics in dental technology. Part 2.

Part 2 covers the areas of friction and lubricants, cross sections, parallelism, passivity and equilibration, levers, reducing the radius, immobilization, and transmitral of forces. Some elements of biomechanics are included in the article because of the interrelationship of biomechanics to engineering.

Dental Clasps↗