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H Dodd

Publications and source records attributed to H Dodd.

10 recordsLinked to original sources
PubMed1991

Nisin biosynthesis genes are encoded by a novel conjugative transposon.

Genes for biosynthesis of the lactococcal peptide antibiotic nisin were shown to be encoded by a novel chromosomally located transposon Tn5301. The element is 70 kb in size and lacks inverted repeats at its termini. Although a copy of the insertion sequence IS904 is located near to one end, this did not appear to be involved in the transposition process. The integrated element is flanked by the directly repeated sequence 5'-TTTTTG-3'. Analysis of ten independent transconjugants revealed that Tn5301 integration is site-specific; two chromosomal targets were identified and shown to have some sequence homology. The element shares features with the Tn916 family of conjugative transposons and with Tn554 but is also exhibits some unique properties. Tn5301 is thus considered to be the prototype of a novel class of conjugative transposon.

Base Sequence↗
PubMed1985

Influence of dietary carbohydrate on skeletal muscle glucose uptake.

The effect of altering the percent of dietary carbohydrate on the rate of skeletal muscle glucose uptake was studied using the perfused rat hindlimb preparation. The rats received either a high carbohydrate (HC; 65%), mixed (M; 35%) or low carbohydrate (LC; 10%) isocaloric diet for 7 days. With 0.1 mU/ml of insulin in the perfusate, the muscle of rats on the HC diet had a 33% increase in the rate of glucose uptake and the muscle of rats fed the LC diet a 23% decrease in the rate of glucose uptake when compared to the muscle of rats fed the M diet (3.34 mumol/g/30 min). With 10.0 mU/ml of insulin in the perfusate, ie maximal insulin stimulation, the rate of glucose uptake showed a similar dietary effect as that obtained with 0.1 mU/ml insulin. Compared to the M diet (8.67 mumol/g/30 min), the rate of glucose uptake increased 26% in muscle of rats from the HC group and decreased by 20% in muscle of rats from the LC group. Diet had no effect on the rate of muscle glucose uptake in the absence of insulin. Under both maximal and submaximal insulin stimulation, glycogen accumulation was greatest in muscle from HC fed rats and least in muscle from LC fed rats. During perfusion muscle intracellular free glucose and glucose-6-phosphate accumulation for the three dietary groups was negligible. The groups did not differ significantly in their muscle hexokinase or beta-hydroxyl acyl CoA dehydrogenase activities.(ABSTRACT TRUNCATED AT 250 WORDS)

3-Hydroxyacyl CoA Dehydrogenases↗
PubMed1985

Ultrasound as a screening procedure for methotrexate-induced hepatic damage in severe psoriasis.

Methotrexate has been of proven value in the management of patients with severe psoriasis. Its long-term use, however, can be complicated by progressive hepatic damage which has necessitated regular liver biopsies. We have looked into the efficacy of liver ultrasonography as a non-invasive screening procedure to select those patients who may be developing liver changes. Eighty-seven investigations on 82 patients were performed, comparing liver ultrasound results with liver biopsy. Eight of these showed a degree of hepatic damage which was sufficient to indicate cessation of methotrexate, and all of these were detected by ultrasonography. Our results indicate that patients whose last liver biopsy was normal could be allowed an extended interval between biopsies provided their intervening ultrasound scans remained normal.

Adult↗
PubMed1976

Juvenile polyposis coli concurrent with neurofibromatosis.

Juvenile polyposis coli associated with neurofibromatosis in a 24-year-old white man is reported. Juvenile polyposis coli is now recognized as a distinct clinical entity. Differentiating it from the other hereditable gastrointestinal polyposis syndromes is important because of the lack of reported malignancies. Radical surgery is unnecessary unless warranted by the clinical features of bleeding or diarrhea. The known gastrointestinal and extra gastrointestinal associations with juvenile polyposis coli are reviewed along with the gastrointestinal manifestations of neurofibromatosis. This is the first reported association of neurofibromatosis with this unusual syndrome.

Adult↗
PubMedDate not supplied

Ethanol lowers heart carnitine in the methionine and choline deficient rat.

In agreement with the findings of others, heart carnitine levels of male, weanling Sprague-Dawley rats fed nutritionally adequate liquid diets with 35% of calories as ethanol for 3 weeks were not different from control or pair-fed rats (Experiment 1). When ethanol was given as 30% of energy in combination with a diet deficient in methionine and choline, and the feeding period was extended to 5 weeks, heart carnitine levels were significantly affected (Experiment 2). Carnitine levels in whole heart homogenates of the methionine and choline deficient chronic ethanol-fed group were 2.14 +/- 0.74 mumoles per g dry wt. significantly lower (p less than 0.05) than deficient controls, 3.08 +/- 0.85 mumoles per g dry wt. We conclude that a methionine and choline deficient diet exacerbates the effects of alcohol on methyl-group metabolism so as to produce decrements in heart carnitine not seen when alcohol is given with an adequate diet.

Alcoholism↗
PubMedDate not supplied

Realistic thinking.

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Behavior Therapy↗