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Biomedical subjects

B R Jones

Publications and source records attributed to B R Jones.

At least 127 records · Page 7Linked to original sources
PubMed1986

Distribution and probable physiological role of esterases in reproductive, digestive, and fat-body tissues of the adult cotton boll weevil, Anthonomus grandis Boh.

Polyacrylamide gel electrophoresis was used to examine gut, Malpighian tube, fat-body, testes, and ovarioles tissues of the adult cotton boll weevil, Anthonomus grandis Boh. Esterases for which the inheritance has been reported previously by Terranova using whole-body homogenates were detected in dissected tissues and the probable physiological function of each allozyme is suggested. EST-1 occurs most frequently in ovarioles and female fat bodies. EST-2 is most often found in fat bodies and may be important in lipid turnover. No sex difference was observed. EST-3S is found in fat bodies and reproductive tissue, while EST-3F is always located in gut tissues, indicating that EST-3 is not controlled by a single autosomal locus with two codominant alleles as previously reported. EST-4, the most abundant esterase, can be detected in gut tissue at any age and is probably involved in digestion. EST-5 contains four allozymes which appear most frequently in testes and may be important during reproduction.

Adipose Tissue↗
PubMed1986

Pericardial ectopic liver in a cat.

An aged domestic short-haired cat was presented for examination because of a six week history of weight loss, diarrhoea, and increased appetite. Clinical examination revealed the cat to be emaciated, icteric and the liver was enlarged. Laboratory tests confirmed the presence of hepatic disease and radiographic examination showed hepatomegaly and ascites together with an enlarged globular heart. Ultrasonography showed a heart of normal size surrounded by tissue and/or fluid within the pericardial sac. Following euthanasia, necropsy revealed the presence of ectopic hepatic tissue within the pericardial sac. Both normally positioned liver and the intrapericardial hepatic tissue showed chronic active pericholangitis and nodular hyperplasia. There was no evidence of a diaphragmatic peritoneal-pericardial hernia, but the intrapericardial mass was connected to the liver by a thin cord of tissue ventral to the caudal vena cava.

Journal Article↗
PubMed1986

A defect in thyroglobulin synthesis in an inherited ovine goitre: possible neonatal respiratory distress syndrome.

A ram lamb with congenital goitre showed signs of respiratory distress at birth. All previously affected lambs from this flock bad been born dead or bad died soon after birth. The serum free-thyroxine level at 1 birth was low (9.8 pmol/l) but treatment with oral L-thyroxine resulted in an increase in thyroxine blood levels to above normal and regression of the goitre. Four weeks after withdrawal of thyroid supplementation and when the lamb was eight weeks old, the radio iodide uptake mechanism of the thyroid glands was shown to be intact but the iodide was not organified. Low normal peroxidase activity was demonstrated in fresh thyroid tissue but gel electrophoresis demonstrated an absence of normal thyroglobulin from extracts of the goitrous thyroid. This lamb and the other affected lambs of this flock have an inherited defect in thyroglobulin synthesis and it is likely that the respiratory distress was associated with the low levels of thyroid hormone affecting foetal lung development.

Journal Article↗
PubMed1985

Primary idiopathic hypoparathyroidism in St. Bernard dogs.

Primary hypoparathyroidism was diagnosed in three St. Bernard bitches. Anorexia, behavioural changes, muscle tremors, seizures, panting respiration, and cataracts were the clinical signs observed. The serum concentration of calcium was low, the phosphorus concentration elevated, and the immunoreactive parathyroid hormone level low in all dogs. The aetiology of the hypoparathyroidism was not determined in any of the dogs. Treatment with synthetic vitamin D (1,25-dihydroxycholecalciferol) and an oral calcium supplement was successful in restoring and then maintaining a normal concentration of serum calcium in two of the dogs.

Journal Article↗
PubMed1985

Conjunctival lipid granulomas in a cat.

A 12-year-old, neutered male cat was examined because of a persistent serous ocular discharge from the left eye. Three, pale cream, 1-4 mm lesions were detected in the palpebral conjunctivae of the left eye. The surgical excision of the lesions resulted in complete resolution of the epiphora. Histological examination confirmed that the lesions were lipid granulomas but the aetiology and pathogenesis of them were not determined. No disease conditions which result in primary or secondary hyperlipoproteinaemia were detected.

Journal Article↗
PubMed1985

Pharmacologic inhibition of immediate hypersensitivity in the guinea pig conjunctiva.

The release of histamine and other mediators from an immediate hypersensitivity reaction is energy dependent and cyclic AMP dependent. Drugs which inhibit the active secretion of mediators, or which may change cyclic AMP are effective in inhibiting mediator release. We used a model of Type I (immediate) hypersensitivity in the conjunctiva of guinea pigs sensitized to normal rabbit serum to test the efficacy of 2-deoxy-D-glucose or a combination of isoproterenol and diethylcarbamazine in inhibiting conjunctival hypersensitivity. After topical challenge with rabbit serum, edema was evaluated in five areas of the guinea pig conjunctiva. Controls were compared to conjunctiva pretreated with 2-deoxy-D-glucose or isoproterenol and diethylcarbamazine. Pretreatment with 2-deoxy-D-glucose or a combination of isoproterenol and diethylcarbamazine was found to inhibit the immediate hypersensitivity reaction.

Animals↗
PubMed1985

Acanthamoeba keratitis successfully treated medically.

The first medical cure of a corneal infection due to an Acanthamoeba species is reported. The 44-year-old patient developed a suppurative keratitis associated with an epithelial defect, hypopyon, and secondary glaucoma. Acanthamoeba was confirmed as the causative agent four months after presentation when positive cultures were obtained from the cornea and from the conjunctiva. Sensitivity studies of the isolated organism were performed, and the infection was successfully controlled by treatment with a combination of dibromopropamidine and propamidine isethionate ointment and drops and neomycin drops. Keratoplasty was performed 22 months after onset, and no viable acanthamoebae were present in the resected tissue, though possible cyst remnants were identified by immunofluorescent techniques.

Adult↗
PubMed1984

Dehydrational crises from severe diarrhoea or heatstroke and risk of cataract.

The first of a series of epidemiological studies in progress in India has shown a strong association between risk of cataract and remembered episodes of dehydrational crises from severe cholera-like diarrhoeal disease. The findings suggest that severe diarrhoea is a major risk factor in early development of cataract and might account for about 36% of cases in the study area.

Adult↗
PubMed1984

Intestinal lymphangiectasia in a dog.

An eight-month-old female crossbred terrier was presented with a short history of diarrhoea, dyspnoea and abdominal distension. Clinical examination revealed thoracic effusion, ascites, and subcutaneous oedema. Hypoalbuminaemia, hypoglobulinaemia and lymphopaenia were all present. Histological examination of a jejunal biopsy confirmed a diagnosis of intestinal Iymphangiectasia. Full clinical recovery followed treatment by dietary management.

Journal Article↗
PubMed1983

Occurrence of idiopathic, familial hyperchylomicronaemia in a cat.

Primary hyperlipoproteinaemia (hyperchylomicronaemia with slight very low density lipoprotein elevation) is described in two related male cats. Fasting hyperlipaemia, lipaemia retinalis and subcutaneous xanthomas were detected on clinical examination. In one cat lipoprotein lipase activity measured after heparin activation was significantly reduced compared to the response in a normal cat. The lipid and protein concentration in each of the lipoprotein classes and the lipoprotein distribution of the two hyperlipaemic cats, two normolipaemic relations and 16 normolipaemic adult cats were determined. Plasma cholesterol and triglyceride levels were elevated in the hyperlipaemic cats with the major proportion of triglyceride and cholesterol being present in chylomicrons whereas in normolipaemic cats the majority of triglyceride was contained in very low density lipoprotein. High density lipoprotein was the predominant lipid carrier in both the normolipaemic and the hyperlipaemic cats but the protein content in chylomicrons was elevated in the two affected cats. The lipoprotein distribution in normal cats in this study agrees with previously reported values. The hyperlipaemic cats showed many of the features of familial lipoprotein lipase deficiency (type I hyperlipoproteinaemia, exogenous chylomicronaemia) which is an inherited disease in man.

Animals↗
PubMed1983

Granulomatous meningoencephalomyelitis of dogs in New Zealand.

A progressive neurological disease affecting twenty-two young adult dogs of smaller breeds is reported. The disease was most often acute in onset and the neurological signs included cervical pain, seizures, behavioural changes, ataxia, head tilt, muscle tremor and paresis. The lesions were those of a disseminated granulomatous meningoencephalomyelitis in which perivascular cuffs of macrophages and lymphoid cells were the predominant finding. Severe lesions were most often seen in the cerebral white matter although the brain stem, mid-brain and spinal cord were also commonly affected.

Journal Article↗