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Biomedical subjects

K Moore

Publications and source records attributed to K Moore.

At least 235 records · Page 13Linked to original sources
PubMed1985

Growth-plate-chondrocyte profiles and their orientation.

We studied the proximal tibial physes of mice, seven, fifteen, twenty-two, and twenty-eight days old, to define in mathematical terms the changes in cell profile and profile orientation among growth-plate zones and to determine if cell profile and profile orientation change with changes in the rate of growth. Using electron microscopy, we identified five growth-plate zones: the reserve zone, the upper proliferative zone, the lower proliferative zone, the upper hypertrophic zone, and the lower hypertrophic zone. In transverse sections, cell profiles did not change among growth-plate zones and the degree of cell-profile orientation approached zero in all zones. In longitudinal sections, cell profiles and profile orientations differed significantly among zones. Cell profiles in the upper and lower proliferative zones were eccentric and highly oriented. They became more rounded and the degree of cell orientation decreased between the proliferative and hypertrophic zones. As the rate of longitudinal bone growth decreased, cell profiles and cell-profile orientation changed. The cell profiles in the reserve zone became flatter and in the other zones the cell profiles became more rounded. The degree of cell-profile orientation decreased quadratically in the upper and lower proliferative zones, decreased linearly in the reserve and upper hypertrophic zones, and remained unchanged in the lower hypertrophic zone.

Aging↗
PubMed1985

Relationship among IgE-binding factors with various molecular weights.

The rat-mouse T cell hybridoma 23B6 forms IgE-binding factors on incubation with IgE. The hybridoma cells incubated with IgE contained intracellular IgE-binding factors of 60K, 30K, 14K, and 10K daltons, and secreted the 60K, 30K, and 14K IgE-binding factors. Both intracellular and extracellular IgE-binding factors of 60K and 14K daltons selectively suppressed the IgE response, whereas the 30K and 10K factors failed to do so. Reduction and alkylation of the extracellular 60K IgE-binding factors yielded fragments of 30K, 14K, and 10K daltons with IgE-binding activity, and the same treatment of the 30K "inactive" IgE-binding factor yielded the 14K and 10K fragments. Among the fragments obtained by reduction and alkylation, only the 14K IgE-binding factors selectively suppressed the IgE response. Monoclonal antibody OX 3, which recognizes an Ia determinant, bound the 60K and 30K IgE-binding factor, and the 30K fragment obtained by reduction and alkylation. None of the 14K and 10K IgE-binding factors and fragments of comparable size obtained by reduction and alkylation contained the antigenic determinant. The results indicate that 30K, 14K, and 10K IgE-binding factors are derived from the 60K precursor molecules. Transfection of COS 7 monkey kidney cells with a single cloned cDNA, 8.3, which encodes rodent IgE-binding factor, resulted in the formation of IgE-binding factors of 60K and 11K daltons. Both species of the factors had affinity for lentil lectin and selectively potentiated the IgE response, but only the 60K IgE-binding factor bound to the monoclonal anti-Ia antibody. Reduction and alkylation of the 60K IgE-binding factors from the cDNA clone yielded an 11K fragment having the same properties as the 11K IgE-binding factor, with respect to the affinity for lentil lectin, and the biologic activities. Because the cDNA clone was constructed from mRNA of 23B6 cells, it appears that the 60K IgE-binding factor molecule from 23B6 cells is composed of a single peptide chain, and that the naturally formed 30K, 14K, and 10K IgE-binding factors are formed by post-translational modification of the 60K peptide.

Animals↗
PubMed1984

Training social workers to work with the terminally ill.

Working with dying patients and their families may be some social workers' most emotionally difficult challenge. The seminar described here was designed to heighten social workers' awareness of their own feelings about dying and to sensitize them to the emotions and needs of patients and families confronting death.

Attitude to Death↗
PubMed1984

Serum ferritin as a measure of stored iron in horses.

Occasionally, horses are given large amounts of iron to improve performance. Although iron deficiency could limit erythrocyte production and other functions related to nonhematological tissues, it probably only occurs in blood loss. We have developed an enzyme immunoassay for ferritin in equine sera and evaluated its relationship to iron stored in liver and spleen. Serum ferritin correlated significantly (P less than 0.0001) with the concentration of nonheme iron in the liver and spleen. It increased following iron therapy and decreased after phlebotomy. We conclude that serum ferritin provides a good index of hepatic and splenic iron and can be used to evaluate iron storage in horses.

Anemia, Hypochromic↗
PubMed1984

Serum ferritin and total iron-binding capacity to estimate iron storage in pigs.

The inability to accurately determine storage iron in baby pigs limits the development of new treatment programs. In pigs treated neonatally with iron dextran, serum ferritin had increased dramatically at ten days of age and then returned to near preinjection levels by 50 days of age. In contrast, serum ferritin in untreated pigs declined until they were offered creep feed at 21 days of age. When serum ferritin, serum iron, serum total iron-binding capacity, erythrocyte number, packed cell volume, and blood hemoglobin were measured in three-week-old pigs, serum ferritin combined with serum total iron-binding capacity correlated significantly with the total nonheme iron in the liver and spleen. The nonheme iron (in mg) could be predicted (r2 = 0.71) by the following expression: 8.7 + 0.6 (ferritin in ng/ml).

Animals↗
PubMed1983

Enhanced Fc receptor expression by a sub-population of murine intra-tumour macrophages following intravenous Corynebacterium parvum therapy.

Intravenous injection of Corynebacterium parvum (C. parvum) 4 days after s.c. inoculation of 5 X 10(5) cells derived from the immunogenic fibrosarcoma FSA/R induced tumour growth inhibition over a period of 21 days in syngeneic C3H/Buf mice. This was not accompanied by a change in the proportions of host cells within the tumour, but the activation state of tumour-infiltrating macrophages was increased following C. parvum therapy. Two macrophage subpopulations were identified in FSA/R tumours after fractionation by unit gravity velocity sedimentation. After i.v. C. parvum therapy the tumour-infiltrating macrophage subpopulation which sedimented between 1 and 6 mm h-1 was consistently activated as determined by measurement of Fc receptor avidity. Other intra-tumour macrophages were generally unaffected by C. parvum treatment. We have previously shown that the host cell fraction sedimenting between 1 and 6 mm h-1 is enriched with monocytes and the data presented in this paper suggest that these cells may enter the tumour in a pre-activated state following intravenous C. parvum therapy.

Animals↗
PubMed1983

Evaluation of the effect of nonlinear kinetics on dosage adjustments of theophylline.

The pharmacokinetics of theophylline at two different dosage levels were studied in six adult volunteers. The subjects were allowed to reach steady-state serum concentrations of theophylline after 7 days of administration of a sustained-release oral product. There was a statistically significant decrease (p = 0.03) in the total body clearance (TBC) of theophylline at the higher dosage level. At a daily dose of 10.6 mg/kg/day, the mean TBC was 0.76 ml/min/kg, whereas at a dose of 15.7 mg/kg/day the TBC averaged 0.68 ml/min/kg. For two of the subjects, a linear increase in serum concentrations occurred with increasing doses. The remaining four subjects showed a saturation of the elimination processes at the higher dosage. The apparent maximum velocity (Vmax) calculated in these subjects averaged 2,923 mg/day. The mean Michaelis-Menten constant (Km) was 23.70 micrograms/ml. Computer-generated serum concentrations produced by a linear increase in doses predicted toxic concentrations of theophylline in two of the six subjects. The results suggest caution in employing a linear model for the individualization of theophylline therapy.

Administration, Oral↗
PubMed1983

Fractionation of human tumour-associated cells by centrifugal elutriation to establish lymphocyte, macrophage and tumor cell cultures from a single tumour biopsy.

The application of the Beckman centrifugal elutriator system for the simultaneous isolation of lymphocytes, macrophages and tumour cells from enzyme disaggregated tumour-associated cells or from peritoneal aspirates is described. Using this technique we have been able to prepare cultures of these cells from single human tumour biopsies. Overall cellular recovery was always in excess of 70% and the purity of cell fractions varied between 89 and 99%. Lymphocyte fractions were found to be free of tumour cell contamination and this allowed lymphocyte cultures in T-cell growth factor containing medium to be established. Using this approach it should prove possible to investigate the clonal effector functions of tumour infiltrating lymphocytes against autologous and allogeneic tumour cells.

Adenocarcinoma↗
PubMed1983

Hereditary elliptocytosis with protein band 4.1 deficiency in the dog.

A dog with persistent elliptocytosis was studied. The dog had membrane protein band 4.1 deficiency, microcytosis, shortened erythrocyte lifespan, increased osmotic sensitivity, and a mild glutathione deficiency. Erythrocyte deformability and membrane stability were adversely effected. The dog's parents had decreased band 4.1, decreased stability, and some elliptocytosis. This disorder in dogs closely resembles human patients with band 4.1 deficiency and should provide a valuable animal model to study the erythrocyte membrane cytoskeleton.

Animals↗
PubMed1983

Glutathione metabolism in canine hereditary stomatocytosis with mild erythrocyte glutathione deficiency.

Mild glutathione deficiency can accompany hereditary stomatocytosis in man and dogs. We studied several facets of glutathione metabolism in dogs to better define hereditary stomatocytosis. In vivo glutathione flux was measured with alpha-ketoglutarate-alpha-(2-14C) and glycine-(2-3H) in a double-labeled experiment. Glycine-labeled glutathione turnover was faster than that of alpha-ketoglutarate-labeled glutathione, and the glutathione flux was greater in HSt cells than in normal cells. The glutathione-reducing enzymes, glutathione reduction rate, glutathione precursors (except cysteine), oxidized glutathione percentage, and erythrocyte water were increased significantly in HSt cells. Glutathione synthetic enzymes, oxidized glutathione transport system, and glutathione-S-transferase did not differ significantly. These observations suggest that the mild glutathione deficiency in canine hereditary stomatocytosis is a reflection of increased catabolism.

Anemia, Hemolytic, Congenital↗
PubMed1982

A pilot investigation of the psychologic functioning of patients with anticipatory vomiting.

A pilot investigation of nine cancer patients receiving chemotherapy on an outpatient basis at the University of Florida's Shands Teaching Hospital is reported. The focus of the study was comparing patients with anticipatory vomiting symptoms with patients who did not exhibit prechemotherapy vomiting on measures of affect and coping style. The data indicated that patients exhibiting prechemotherapy vomiting, compared with the other patients, were more anxious and depressed; additionally, they exhibited a coping style which was inhibitive rather than facilitative in nature. A theoretical context for defining and treating prechemotherapy vomiting is offered.

Antineoplastic Agents↗
PubMed1982

Political implications of the 'new ageism'.

The research tradition of old age stereotypes has typically been limited to a social psychological perspective of their dysfunctional consequences. This exploratory study examines the possible functions served by such stereotypes from a sociocultural frame of reference, in particular, testing the hypothesis of Richard Kalish and Carroll Estes that problem-oriented conceptions of older persons are part of an emerging political ideology. Using the responses of the Louis-Harris-NOCA "The Myth and Reality of Aging in America" survey, the relation between aging stereotypes and attitudes toward federal support of the aged are reported.

Adolescent↗