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Biomedical subjects

D J West

Publications and source records attributed to D J West.

At least 73 records · Page 4Linked to original sources
PubMed1982

Evaluation of a passive hemagglutination test kit for the detection of rubella antibodies.

RUBACELL (Abbott Laboratories), a commercial test kit for the detection of rubella antibodies that utilizes the principle of passive hemagglutination (PHA), was compared with a standard hemagglutination-inhibition (HI) assay procedure. The PHA test gives a qualitative yes/no result suitable for pregravidic determination of immune status. The procedure is technically simple and requires less than half the time needed for the HI assay. Four of 61 sera that were negative with HI assay tested as indeterminate or as falsely positive using the RUBACELL procedure.

Antibodies, Viral↗
PubMed1980

The clinical approach to criminology.

The crucial importance of economic, social and political factors in the definition and incidence of crime is undeniable, as is the need for socio-political change, but the part played by individual characteristics in determining who becomes labelled a criminal should not be neglected. Clinical criminology studies offenders as individuals, examines their peculiarities and their social problems and seeks ways to help them to lead less troubled lives. A wide range of treatment interventions is required, the psychiatric approach is not always the most appropriate. In view of the lack of success in reducing recidivism by means of treatment, penologists see little justification for continuing to try. More successes might be recognized if treatment schemes were applied with greater realism and discrimination, and if proper evaluations were made more often. In any event, some offenders need treatment regardless of the effect upon their offending behaviour.

Adolescent↗
PubMed1979

Isolation and characterization of temperature-sensitive respiratory mutants of Neurospora crassa.

Filtration-enrichment and inositol-less death methods of mutant isolation, coupled with a screen for cyanide-insensitive respiration, proved to be highly efficient methods for isolating temperature-sensitive (ts) nuclear Neurospora mutants having defective respiration. Eighteen different ts respiratory mutants have been isolated. Most of them are pleiotropic and defective in one or more of the following phenotypes: cytochrome aa3, b, and c (individual or multiple defects); oligomycin inhibition of ATPase activity; respiration and its inhibition by KCN and salicyl hydroxamic acid; and growth rates in liquid and solid media at 25 degrees and 38 degrees. Among these mutants are the first cytochrome c mutant of Neurospora and an extranuclear ts ATPase mutant. An added bonus was the fact that over half of the mutants were affected either in ribosome assembly or in protein synthesis in the mitochondrion. We have yet to find any mutants completely lacking activities associated with the respiratory chain. However, the wide spectrum of mutants isolated here, along with those currently available, constitutes a considerable resource for investigating respiration in obligate aerobes.

Adenosine Triphosphatases↗
PubMed1977

A temperature-sensitive mutant of Neurospora crassa deficient in cytochrome b.

A nuclear gene mutant of Neurospora crassa designated cyb-3 is deficient in cytochrome b and coenzyme QH2-cytochrome c reductase. Nearly normal when grown at 25 degrees C, the strain expresses a mutant phenotype at 38 degrees C. Mitochondria from cyb-3 mycelium, which has undergone 3-4 mass doublings at the elevated temperature, possess 3-fold less cytochrome b, 2-fold more cytochrome, c, 5-fold less coenzyme QH2-cytochrome c reductase activity, and require 3-fold less antimycin A per milligram of protein to inhibit NADH oxidation that do wild type mitochondria. The activity of coenzyme QH2-cytochrome c reductase declines rather slowly in cultures of cyb-3 transferred to 38 degrees C, and the in vitro thermostability of the enzyme is very similar in wild type and mutant mitochondria. Therefore, the mutation may decrease synthesis of impair integration into the membrane of cytochrome b and perhaps other proteins of the enzyme comple.

Cytochrome Reductases↗
PubMed1973

Succinate oxidase in Neurospora.

Two kinetically distinct states of succinate oxidase have been detected in the mitochondria of Neruospora crassa. One state has a K(m) for succinate of 4.1 x 10(-3)m, and the other has a K(m) for succinate of 3.5 x 10(-4)m. The high K(m) state was found in freshly extracted mitochondria from either 20- or 72-hr mycelium. However, the succinate oxidase activity in mitochondria from 20-hr mycelium rapidly deteriorated in vitro, leaving a stable residual activity with the lower K(m) for succinate. Adenosine triphosphate (ATP) plus Mg(2+) stabilized the high K(m) state in these preparations. The high K(m) state of succinate oxidase was further characterized by a two- to threefold increase in activity over the pH range 6.6 to 8.0 and by classical competitive inhibition by fumarate and malonate. By contrast, the low K(m) state of succinate oxidase showed a relatively flat response to pH over the range 6.6 to 8.0 and a nonclassical pattern of inhibition by fumarate and malonate, as shown by nonlinear plots of reciprocal velocity versus reciprocal substrate concentration in the presence of inhibitor or reciprocal velocity versus inhibitor concentration at fixed substrate concentrations. The relationship of mycelial age to the in vitro stability of succinate oxidase is considered with reference to probable changes in the relative pool sizes of extra- and intramitochondrial ATP in response to changes in the rate of glycolysis.

Adenosine Triphosphate↗