organic acid/hypoxia

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Effects of hypoxia on urinary organic acid and hypoxanthine excretion in fetal sheep.

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Severe birth asphyxia leads to a transient organic aciduria and increased hypoxanthine excretion. To investigate its origin and timing, we analyzed urine from 12 late gestation fetal sheep in utero subjected to moderately severe isocapnic hypoxia for 1 h. In six fetuses the carotid sinus nerves were

Organic acids in the brain in hypoxemia.

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Enhancement of pyruvic acid production in Candida glabrata by engineering hypoxia-inducible factor 1.

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Dissolved oxygen (DO) supply plays essential roles in microbial organic acid production. Candida glabrata, as a dominant strain for producing pyruvic acid, principally converts glucose to pyruvic acid through glycolysis. However, this process relies excessively on high extracellular DO content. In

Osmotic and ionic regulation during hypoxia in the medicinal leech, Hirudo medicinalis L.

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The concentrations of inorganic and organic ions and osmolality in the blood of the medicinal leech, Hirudo medicinalis, were determined during normoxia and hypercapnic and hypocapnic hypoxia. In normoxic animals, the blood sodium concentration was 124.5 +/- 4.2 mmol/l and the total cation

Combined effects of salinity, temperature and hypoxia on Daphnia magna metabolism.

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Metabolic changes of Daphnia magna pools due different abiotic factors linked to global climate change (salinity, temperature and hypoxia) were investigated using untargeted GC-MS and advanced chemometric strategies using a three factors two-level full factorial experimental design (DoE). Effects of

Brain amino acids in conscious rats in chronic normocapnic and hypocapnic hypoxemia.

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The influence of hypoxemia on the brain content of several organic acids and NH+4, AND ITS RELATIONship to the accompanying hypocapnia was studied in unanesthetized rats subjected to hypoxemia for periods ranging between 2 hours and 7 days. Under acute conditions, 'mild' hypoxemia (FO2 = 6--7%),

Involvement of nitrite in the nitrate-mediated modulation of fermentative metabolism and nitric oxide production of soybean roots during hypoxia.

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It is widely accepted that nitrate but not ammonium improves tolerance of plants to hypoxic stress, although the mechanisms related to this beneficial effect are not well understood. Recently, nitrite derived from nitrate reduction has emerged as the major substrate for the synthesis of nitric oxide

Metabolic responses of the limpet Patella caerulea (L.) to anoxia and dehydration.

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This study examined the metabolic responses of the limpet Patella caerulea (L.) to anoxia and dehydration, attempting to tease apart the effect of these two stressful conditions, which are often not clearly distinguished in experiments. Specimens were exposed to: (a) oxygen-free sea water; (b)

Review: Mechanisms of anoxia tolerance in plants. II. Energy requirements for maintenance and energy distribution to essential processes

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Anoxia in plant tissues results in an energy crisis (Gibbs and Greenway 2003). How anoxia-tolerant tissues cope with such an energy crisis is relevant not only to anoxia tolerance, but also to adverse conditions in air that cause an energy crisis.To survive an energy crisis, plant cells need to

Comparative metabolomics analysis of Callosobruchus chinensis larvae under hypoxia, hypoxia/hypercapnia and normoxia.

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BACKGROUND Insect tolerance to low oxygen (hypoxia) and high carbon dioxide (hypercapnia) is critical for insect control. On the basis of bioassay, metabolism profiles were built to investigate adaptive mechanisms in bean weevil under hypoxia (2% O2 ), hypoxia/hypercapnia (2% O2 + 18% CO2 ) and

Prolonged root hypoxia induces ammonium accumulation and decreases the nutritional quality of tomato fruits.

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Here we examined the effects of root hypoxia (1-2% oxygen) on the physiology of the plant and on the biochemical composition of fruits in tomato (Solanum lycopersicum cv. Micro-Tom) plants submitted to gradual root hypoxia at first flower anthesis. Root hypoxia enhanced nitrate absorption with a

Changes in acid-base and ion balance during exercise in normoxia and normobaric hypoxia.

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OBJECTIVE Both exercise and hypoxia cause complex changes in acid-base homeostasis. The aim of the present study was to investigate whether during intense physical exercise in normoxia and hypoxia, the modified physicochemical approach offers a better understanding of the changes in acid-base

NAD+/NADH homeostasis affects metabolic adaptation to hypoxia and secondary metabolite production in filamentous fungi.

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Filamentous fungi are used to produce fermented foods, organic acids, beneficial secondary metabolites and various enzymes. During such processes, these fungi balance cellular NAD+:NADH ratios to adapt to environmental redox stimuli. Cellular NAD(H) status in fungal cells is a trigger of changes in

Evaluation of the renal toxicity of heme proteins and their derivatives: a role in the genesis of acute tubule necrosis.

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This investigation studies the toxicity of heme proteins and/or their break-down products on renal function. Heme proteinemia precedes acute tubule necrosis at a frequency great enough to suggest a causal relationship between the two events. Physiological and metabolic functions of kidney slices are

Kynurenic acid in brain and cerebrospinal fluid of fetal, newborn, and adult sheep and effects of placental embolization.

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Concentrations of the endogenous glutamate receptor antagonist kynurenic acid (KA) were measured in various brain regions and in cisternal cerebrospinal fluid of fetal, newborn, and adult sheep. KA concentrations were significantly higher in the fetal brain and cerebrospinal fluid at 90 and 140 d

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