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Biomedical subjects

M R Hall

Publications and source records attributed to M R Hall.

16 recordsLinked to original sources
PubMed1979

Histone modifications in simian virus 40 and in nucleoprotein complexes containing supercoiled viral DNA.

Simian virus (SV40) nucleoprotein complexes containing circular supercoiled viral DNA were extracted from infected cells and purified by differential centrifugation. The protein content of these complexes was compared by electrophoresis on 15% acrylamide gels with the protein content of purified SV40 virions and with histones from virus-infected cells. The electrophoretic patterns of histones from each of the sources revealed several major differences. SV40 virions contained histones H3, H2B, H2A, and H4 but not H1. Nucleoprotein complexes and host cells contained all five major histone groups. Relative to cellular histones, virion and nucleoprotein complex histones were enriched 15 to 40% in histones H3 and H4. In addition to the major classes of histones, several subfractions of histones H1, H3, and H4 were observed in acrylamide gels of proteins from SV40 virions and viral nucleoprotein complexes. Acetate labeling experiments indicated that each subfraction of histones H3 and H4 had a different level of acetylation. The histones from SV40 virions and nucleoprotein complexes were acetylated to significantly higher levels than those of infected host cells. No apparent differences in phosphorylation of the major histone groups were observed.

Acetylation↗
PubMed1979

Chromophobe adenoma of the pituitary with Cushing's syndrome and skin pigmentation.

A 76-year-old man with pigmentation and Cushing's disease is described, who was found to have a large chromophobe adenoma of the pituitary. Despite normal skull X-rays the presence of bitemporal hemianopia led to the diagnosis which was later confirmed at post-mortem. Adrenalectomy performed in the treatment of Cushing's disease may be followed by skin pigmentation and an enlarging pituitary tumour (Nelson's syndrome), changes which are commonly attributed to the removal of the negative feed-back mechanism. The spontaneous occurrence of these changes in this patient who did not undergo adrenalectomy supports the view that a pituitary tumour pre-exists in cases of Nelson's syndrome and emphasizes the importance of directing initial treatment to the pituitary.

Adenoma, Chromophobe↗
PubMed1977

A second look at emepronium bromide in urinary incontinence.

Response to oral and intramuscular emepronium bromide was assessed cystometrically in nine patients with urinary incontinence caused by an uninhibited bladder. Oral therapy had no effect, whereas intramuscular administration increased bladder capacity and significantly delayed the onset of bladder spasm and the desire to void. Plasma-propranolol response was delayed and concentrations were reduced after an oral 40 mg dose of propranolol in 3 patients who had received oral emepronium bromide. These results indicate that although oral emepronium bromide had some anticholinergic effect--i.e., in reducing gastrointestinal motility--absorption of an oral dose was not sufficient for the bladder to be affected.

Administration, Oral↗
PubMed1977

The teaching of medical ethics at Southampton University Medical School.

For centuries medical schools in Britain and elsewhere had a fairly static curriculum based on what might be called the 'three Rs' of medicine, and consequently had to make room for new subjects as the need arose in a fashion which was sometimes makeshift. However, Southampton University has only had a medical school for six years, and therefore their course on medical ethics and legal medicine was carefully integrated into the curriculum after some preliminary experiments carried out by a subcommittee which is continually reviewing the situation. Medical ethics has now a definite place in the fourth year, preceded by an introduction to ethical problems encountered in medicine in the first year. Not only do members of the medical faculty participate in this teaching but also members of the faculties of law and the arts.

Curriculum↗
PubMed1977

Gastric histology and its relation to anaemia in the elderly.

During 1 year 725 consecutive patients admitted to a geriatric unit were investigated for anaemia. 51% of men had haemoglobin levels below 13.5 g/dl and 41% of women had levels below 12 g/dl. 657 patients had an azuresin tubeless test meal following an augmented dose of histamine acid phosphate and 450 (68%) had achlorhydria. Gastric biopsies were performed on 240 of the patients with achloryhdria and 201 satisfactory biopsies were obtained. These were graded into five categories: (1) normal; (2) surface gastritis; (3) diffuse gastritis; (4) chronic atrophic gastritis, and (5) chronic atrophic gastritis with intestinal metaplasia. The grades of mucosal change could not be correlated with the presence or absence of anaemia, the state of gastric function as measured by the Schilling test for absorption of vitamin B12, or the level of vitamin B12 in the serum.

Achlorhydria↗
PubMed1976

Geriatrics.

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Aged↗
PubMed1975

Proteins in intracellular simian virus 40 nucleoportein complexes: comparison with simian virus 40 core proteins.

Intracellular nucleoprotein complexes containing SV40 supercoiled DNA were purified from cell lysates by chromatography on hydroxyapatite columns followed by velocity sedimentation through sucrose gradients. The major protein components from purified complexes were identified as histone-like proteins. When analyzed by electrophoresis in sodium dodecyl sulfate-polyacrylamide gels, complex proteins comigrated with viral core polypeptides VP4, VP5, VP6, and VP7. (3H) tryptophan was not detected in polypeptides from intracellular complexes or in the histone components from purified SV40 virus. However, a large amount of (3H) tryptophan was found in the viral polypeptide VP3 relative to that incorporated into the capsid polypeptides VP1 and VP2. Intracellular complexes contain 30 to 40% more protein than viral cores prepared by alkali dissociation of intact virus, but when complexes were exposed to the same alkaline conditions, protein also was removed from complexes and they subsequently co-sedimented with and had the same buoyant density as viral cores. The composition and physical similarities of nucleoprotein complex and viral cores indicate that complexes may have a role in the assembly of virions.

Amino Acids↗