Search PubMed⌕ Search

Biomedical subjects

G R Scott

Publications and source records attributed to G R Scott.

At least 73 records · Page 4Linked to original sources
PubMed1984

Amoebiasis in homosexual men.

The clinical, histopathological, and serological features of 35 homosexual men with infection with Entamoeba histolytica were studied and compared with a group of 35 non-infected homosexual men. Each isolate was of Zymodeme type I. Although there was no significant difference in the numbers of infected and non-infected men with gastrointestinal symptoms (48.6% and 28.6% respectively), the mean duration of symptoms was greater in with amoebiasis (p less than 0.05). The histology of the rectal mucosa was abnormal in 17 (63.0%) of the 27 men with amoebic infection only and in two (7.4%) of the 27 control subjects (p less than 0.001). Serum antibodies reactive with E. histolytica were not shown in any patient.

Adolescent↗
PubMed1983

The dental morphology of Pima Indians.

Fourteen morphologic crown traits were observed in a sample of 1528 Pima Indians of south-central Arizona. Pima dentitions are characterized by high frequencies of shoveling, incisor winging, the hypocone, the lower canine distal accessory ridge, cusp 6, and the protostylid. They exhibit low frequencies of the metaconule and lower premolar multiple lingual cusps and moderate frequencies of the canine tubercle, Carabelli's trait, cusp 7, and lower second molars with four cusps and X groove patterns. When Pima crown trait frequencies were compared to those of 13 Southwest Indian samples, their closest affinities were to other Uto-Aztecan groups, the Papago and Hopi. The Pima are most divergent from Athapaskans and are also clearly removed from Yuman speaking groups and the Zuni. In general, the pattern of dental morphologic variation in the Southwest corresponds closely to linguistic divisions.

Arizona↗
PubMed1983

Fluctuating asymmetry in molar dimensions and discrete morphological traits in Pima Indians.

Asymmetry in mesiodistal and buccolingual crown diameters and in eight morphologic crown traits of permanent first and second molars was analyzed in a large Pima Indian sample. Analysis of antimeric differences indicates no consistent evidence for directional asymmetry in Pima molars for either dimensions or morphologic traits. Second molars show greater degrees of metric and morphologic asymmetry than first molars. There is no conclusive evidence for either sex differences in magnitude of asymmetry or relationships between tooth size and morphologic asymmetry. Nonparametric correlations computed between asymmetry in crown dimensions and morphological traits show no significant interaction except where morphological trait development affected crown measurements. The distributions of antimeric differences for dimensional and morphologic traits demonstrate significant leptokurtic deviations from normality. This indicates fluctuating asymmetry in Pima Indians may result from several different sources of developmental variation.

Arizona↗
PubMed1983

The influence of crown size dimorphism on sex differences in the Carabelli trait and the canine distal accessory ridge in man.

When the two sexes were contrasted, Pima Indian males showed larger crown dimensions and more pronounced expressions of two morphologic variables, the Carabelli trait and the lower canine distal accessory ridge. In addition, a significant positive relationship was found between crown size and degree of expression of the morphologic traits. When regression analysis was utilized to control for male-female tooth size differences, the moderate dimorphism shown by Carabelli trait was reduced by about half. The more dimorphic distal accessory ridge, related primarily to mesio-distal diameter, also showed a lesser sex difference when crown size effects were held constant. While size dimorphism does contribute to morphologic dimorphism, factors unrelated to crown size still contribute the majority of variance present in trait expression both within and between sexes.

Cuspid↗
PubMed1982

Toxoplasmosis in rams: possible significance of venereal transmission.

Three rams were infected with tick-borne fever eight months after infection with toxoplasma. There was no clinical evidence of reactivation of the latent toxoplasma infection and semen samples from the rams were not infective to mice. Semen samples from 77 apparently normal rams were tested for toxoplasma infection by passage through mice; none of the samples produced patent infections in mice. Two rams with chronic toxoplasma infection were repeatedly mated with seronegative ewes. None of the ewes showed serological evidence of acquired infection and all lambed satisfactorily.

Animals↗
PubMed1982

Corticosteroid therapy of tick-borne fever.

Treatment of sheep infected with tick-borne fever with betamethasone injection BP abated thermal reactions and induced neutrophilia. The therapeutic effects were, however, transient and the haematological and thermal changes returned to pretreatment levels after 24 hours.

Animals↗
PubMed1982

In vitro propagation of Cytoecetes phagocytophila, the causative agent of tick-borne fever.

Cytoecetes phagocytophila, a neutrophilic rickettsia which parasitizes sheep and cattle, was propagated transiently at 37 degrees C in cultures of heparinized whole blood of sheep supplemented with Medium 199 containing HEPES buffer. Significant increases in the number of infected cells and the number of rickettsias per infected cell were observed within 24 h. Back-passage into sheep produced typical tick-borne fever.

Animals↗
PubMed1982

Tick-borne fever: leucocyte migration inhibition.

When sheep were infected with Cytoecetes phagocytophila the in vitro migration of peripheral leucocytes was reduced even when antigen was not added. The inhibition of migration coincided with parasitaemia and was due to soluble factors which inhibited the migration of leucocytes from normal sheep. After the cessation of parasitaemia addition of antigen was necessary for migration inhibition to occur.

Animals↗
PubMed1981

Cell lines from sheep and cattle blood.

A simple and reproducible method of establishing cell lines from the blood of sheep and cattle is described. Buffy coat cells were allowed to adhere to plastic culture flasks in media containing 20 per cent autologous plasma overnight. The fluids were then replaced with growth medium supplemented with non-inactivated foetal calf serum, lamb serum or autologous serum. Ovine cell lines were established with any of the serum supplements but bovine cell lines established more readily if unheated autologous serum was used.

Animals↗