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Biomedical subjects

J Stuart

Publications and source records attributed to J Stuart.

At least 217 records · Page 12Linked to original sources
PubMed1970

Dehydrogenase enzyme cytochemistry of unfixed leucocytes.

An inert, synthetic, sucrose polymer (Ficoll) has been found to have a protective effect on leucocytes during incubation for cytochemical reactions at 37 degrees C. This permits enzyme cytochemistry to be performed on unfixed bone marrow and peripheral blood smears, and on leucocytes cultured in vitro, thus avoiding enzyme inhibition by the use of a fixative. The technique is suitable for the demonstration of both cytoplasmic and intramitochondrial dehydrogenase enzyme activity.

Bone Marrow↗
PubMed1969

Quantitative enzyme cytochemistry of leukaemic cells.

A new technique for the quantitative estimation of glycolytic and respiratory enzyme activity in intact and unfixed bone marrow and peripheral blood cells is described. The method gives a two- to three-fold increase in demonstrable enzyme activity per cell compared with existing techniques using fixed marrow film preparations, and is particularly applicable to the study of relatively fragile cells such as the leukaemic lymphoblast.

Bone Marrow↗
PubMed1966

Rapid microbiological assay of serum vitamin B 12 by electronic counter.

A new method of measuring the growth of Lactobacillus leichmannii is reported. Its adoption for the estimation of serum vitamin B(12) levels shortens the incubation period required to five hours at 45 degrees C. The method is compared statistically with a standard method of estimation, requiring incubation at 37 degrees C., by duplicate determinations on 106 hospital patients. The significance of the apparently decreased accuracy of the new method at low serum levels is discussed, and a re-appraisal of the optimum growth temperature of Lactobacillus leichmannii suggested.

Biological Assay↗
PubMedDate not supplied

Factors influencing collagen-induced autoimmune ear disease.

In 1981, the authors described a type II collagen-induced autoimmune ear disease (CIAED) model. The purpose of this study was to gather further evidence that this is a sound animal model to use in evaluating inner ear diseases. The temporal bone lesions of CIAED in Lewis and Wistar rats were characterized by the presence of sensorineural hearing loss with mild atrophy of the organ of Corti and spiral ganglion degeneration, vestibular dysfunction with vacuolar degeneration of the crista ampullaris, otospongiosis-like lesions in the tympanic annules, cochlear vasculitis, and eustachian tube disease. Both cellular and humoral immune responses to type II collagen were demonstrated. The induction of ear lesions depends on many factors. In general, animals immunized with antigens in complete Freund's adjuvant showed relatively more severe lesions than animals immunized with antigens in incomplete Freund's adjuvant, but the duration of the immunization seems to be a more important factor in reproducing severe lesions. The strain and the source of the animals are also important factors in autoimmune inner ear diseases, as is the condition of the host animals. Subclinical or clinical mycoplasma infection in the rat markedly reduced the incidence and severity of lesions in type II collagen-induced arthritis. Many researchers did not consider sialoductal adenovirus, widely present among laboratory rats, a lesion-producing factor in rats. Although many factors influence the induction and severity of CIAED, these animal models provide an excellent new avenue of inner ear research.

Animals↗
PubMedDate not supplied

Type II collagen-induced autoimmune salpingitis in rats.

Autoimmune salpingitis was induced in 17 (85%) of 20 outbred Wistar rats by immunization with bovine type II collagen; three of those also developed eustachian tube chondritis. The lesions were characterized by infiltrations of a large number of mononuclear cells in the mucosa and submucosa, destruction of cartilaginous structure, and deposition of IgG and complement C3. The animals had high titers of anti-type II collagen antibody. Immunohistochemical examination using monoclonal antibody to type II collagen revealed the presence of type II collagen in the eustachian tube cartilage. These observations suggest a causal relationship between autoimmunity to type II collagen and salpingitis in the rat, and this animal model may be useful in defining the pathogenesis of eustachian tube diseases mediated by immunity to type II collagen.

Animals↗