A gas-chromatographic method for urinary organic acid analysis is described, designed to be used routinely for the diagnosis of organic aciduria. It involves extraction of urine with ethyl acetate, dehydration of extract residues, and trimethylsilylation. Organic acids are identified by using an extensive list of retention indices published in the accompanying paper (this issue). Quantitative v...

BACKGROUND An accurate assessment of the degree of dehydration in infants and children is important for proper decision-making and treatment. This emphasizes the need for laboratory tests to improve the accuracy of clinical assessment of dehydration. The aim of this study was to assess the relationship between clinical and laboratory parameters in the assessment of dehydration. METHODS We eva...

there is no doubt that breast-feeding is the best and safest way of feeding infants. physiological weight loss occurs in the first two or three days of life, and the achievement of birth weight is expected towards the end of the first week. hypernatremic dehydration may occur in exclusively breast-fed infants if milk supply is low during these first few days. it is not because of the high sodiu...

An in-house designed membrane process suitable for subsea natural gas dehydration was studied. The use of a absorber together with thermopervaporation (TPV) unit solvent regeneration in closed loop enables the effective and clean production high-pressure close to wellhead. This avoids continuous chemical injection preventing hydrate formation pipelines. absorbent agent (triethylene glycol (TEG)...

The process of anion transport trough a synthetic ion channel based in anion···π interactions is studied by means of computational methods. Employing two models for the units forming the channel, the calculations indicate that stable complexes are formed with any of bromide, chloride, fluoride or hydroxide anions. All these complexes exhibit strong interactions in the gas phase. When studied in...

Young plants of the two wheat cultivars Katya and Prelom, differing in their reaction to drought in the field, were grown in soil in pots, and their water status was assessed as well as the intensity of gas exchange, chlorophyll fluorescence, and accumulation of compatible solutes and hydrogen peroxide after 7 days of dehydration. It was established that cv. Katya displayed markedly better tole...

Dehydration (body water deficit) is a physiologic state that can have profound implications for human health and performance. Unfortunately, dehydration can be difficult to assess, and there is no single, universal gold standard for decisionmaking. In this article, we review the physiologic basis for understanding quantitative dehydration assessment. We highlight how phenomenologic interpretati...

Larvae of the Antarctic midge, Belgica antarctica, routinely face periods of limited water availability in their natural environments on the Antarctic Peninsula. As a result, B. antarctica is one of the most dehydration-tolerant insects studied, surviving up to 70% loss of its body water. While previous studies have characterized the physiological effects of a single bout of dehydration, in nat...