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Biomedical subjects

J Pearce

Publications and source records attributed to J Pearce.

At least 109 records · Page 6Linked to original sources
PubMed1976

Osmolality changes in perilymph after systemic administration of glycerin.

Blood osmolality was altered in guinea pigs by intravenous administration of glycerin (glycerol). After glycerin administration, serum osmolality increased rapidly, reaching a plateau within 15 minutes. Perilymph osmolality lagged significantly behind the increase of serum osmolality and equalled serum osmolality only after one hour. While perilymph osmolality responded to changes of serum osmolality, there was some time lag noted in the response of perilymph, suggesting the existence of a blood-labyrinth barrier. It was observed that this barrier is permeably to glycerin and water, suggesting the possibility of transient reduction of hydrostatic pressure in the labyrinth by the injection of an osmotic agent into the systemic circulation.

Animals↗
PubMed1976

The effects of estradiol administration of the hepatic activities of some enzymes of carbohydrate, amino acid and lipid metabolism in the immature pullet.

Two experiments were performed to examine the effects of intramuscular estradiol administration on the hepatic specific activities of some enzymes of lipid, carbohydrate and amino acid metabolism in the immature fowl. Estradiol increased the specific activities of the hepatic lipogenic enzymes, ATP citrate lyase and malate dehydrogenase (decarboxylating) (NADP), but had no effects on the activities of the glycolytic, gluconeogenic and amino acid metabolising enzymes except for pyruvate kinase and glutamate dehydrogenase which were reduced in activity in both experiments. The results indicate that the estrogen-induced increase in hepatic lipid biosynthesis is due to a specific effect on lipid metabolism and not to a general increase in liver metabolism.

ATP Citrate (pro-S)-Lyase↗
PubMed1976

The effects of grass and concentrate diets on the specific activities of some enzymes of hepatic carbohydrate metabolism in sheep.

Feeding sheep a concentrate diet compared with grass diets increased the hepatic specific activities of the three glycolytic enzymes studied, and that of glucose-6-phosphate dehydrogenase (EC 1.1.1.49) and reduced the specific activity of D-fructose-I, 6-diphosphate I-phosphohydrolase (EC 3.1.3.11). The specific activities of phosphogluconate dehydrogenase (EC 1.1.1.43) and malate dehydrogenase (decarboxylating) (NADP) (EC 1.1.1.40) were unaffected by diet.

Alcohol Oxidoreductases↗
PubMed1976

Aspects of lipid and carbohydrate metabolism, dietary biotin and fatty liver and kidney syndrome in broilers.

Two experiments were performed to investigate the biochemical changes associated with FLKS. A diet reported to induce FLKS was fed with or without supplementary biotin to broilers. In experiment 1 various stresses were applied to the birds. 2. In experiment 1 mortality from FLKS was 6% and in experiment 2 nil. Stress had little effect on the induction of the syndrome. 3. There were no significant differences due to diet in any of the variables examined in apparently normal birds. 4. Birds affected by FLKS showed the typical changes of increased liver and kidney weights and lipid contents but hepatic enzyme activities did not differ significantly from those of normal birds except that malate dehydrogenase (decarboxylating) (NADP) activity was significantly decreased. 5. Despite the low content of biotin in the unsupplemented diet (57 mug/kg) liver biotin content was not low in birds fed on this diet. 6. The results suggest that the incidence of FLKS is not related solely to dietary biotin content.

ATP Citrate (pro-S)-Lyase↗
PubMed1975

The effects of choline and inositol on hepatic lipid metabolism and the incidence of the fatty liver and kidney syndrome in broilers.

1. Diets high in wheat and low in protein (18%) produced 5 to 6% mortality from fatty liver and kidney syndrome (FLKS) in broiler chicks whereas there were no deaths from FLKS in birds fed on a maize/barley diet containing 20% protein. 2. Supplementation of the wheat-based diets with choline or inositol (2-5 g additive/kg diet) did not affect the incidence of FLKS or liver lipid metabolism. 3. The wheat-based diet did not significantly affect the activities of hepatic lipogenic enzymes suggesting that hepatic lipid biosynthesis is not a cause of the syndrome. 4. The biotin contents of the wheat and maize/barley diets were little different, which may suggest that factors other than this are implicated in FLKS.

ATP Citrate (pro-S)-Lyase↗
PubMed1974

Blood sugar response to glucagon in migraine.

The hyperglycaemic response to intramuscular glucagon was studied in 19 migraine subjects and 17 matched controls. Venous blood sugar 30 minutes after the injection, and the maximum rise from fasting levels, were significantly reduced in migraine subjects. This diminished sensitivity to the hyperglycaemic action of glucagon may be at least one factor in the hypoglycaemia unresponsiveness shown in migraine.

Adult↗