نتایج جستجو برای: methanol dehydration

تعداد نتایج: 44844  

Journal: :iranian journal of public health 0
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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...

Journal: :Journal of Oral Science 2021

A study was conducted to evaluate the basic mechanical properties of a pure cellulose nanofiber (CNF) material in comparison with commercial denture base (polymethylmethacrylate [PMMA] acrylic resin). The working hypothesis that CNFs have potential for use as materials. Pure CNF specimens fabricated under various conditions were examined. flexural strength (FS) and modulus (FM) measured using t...

2013
Samuel N Cheuvront Robert W Kenefick Nisha Charkoudian Michael N Sawka

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...

Journal: :Bulletin of the Chemical Society of Nigeria 2021

Heterogeneous catalyst was prepared from Portland cement. The heterogeneous tested for catalytic activity in the transesterification of non-edible, high free fatty acid feedstock, such as crude karanja oil (CKO), biodiesel production, at methanol reflux temperature. Gas chromatographic (Gc) analysis technique used to determine methyl ester yield. preparation low-cost sources, and use non-edible...

Journal: :Journal of insect physiology 2012
Nicholas M Teets Yuta Kawarasaki Richard E Lee David L Denlinger

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...

2015
Adam C Levine Justin Glavis-Bloom Payal Modi Sabiha Nasrin Soham Rege Chieh Chu Christopher H Schmid Nur H Alam

INTRODUCTION Diarrhea remains one of the most common and most deadly conditions affecting children worldwide. Accurately assessing dehydration status is critical to determining treatment course, yet no clinical diagnostic models for dehydration have been empirically derived and validated for use in resource-limited settings. METHODS In the Dehydration: Assessing Kids Accurately (DHAKA) prospe...

Journal: :The American journal of clinical nutrition 2013
Samuel N Cheuvront Robert W Kenefick Nisha Charkoudian Michael N Sawka

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 decision making. In this article, we review the physiologic basis for understanding quantitative dehydration assessment. We highlight how phenomenologic interpretat...

Journal: :Energy & Fuels 2021

Dehydration of methanol to produce dimethyl ether (DME) was studied at relatively high temperatures (400–600 °C) on biomass-derived phosphorus-containing carbon impregnated with a zirconium salt. Highly thermally stable phosphate surface groups could be obtained the final catalyst, which were responsible for stability and selectivity DME catalyst lower than 400 °C. However, harder operation con...

Pervaporation (PV) is a well-established membrane technique used in separation; especially dehydration of organic solvents. Along with other parameters such as permeate pressure and feed temperature; feed composition is an important parameter, which affects separation characteristics and membrane performance in pervaporation. In this paper, the separation characteristics of a hydrophilic polyvi...

Journal: :International Journal of Biological Macromolecules 2021

Transesterification of starch with methyl betainate was studied for the first time, both in aprotic media and solid state, under alkaline acidic conditions. Betaine hydrochloride esterified methanol, attaining a conversion 86%. Starch then converted into either N,N-dimethylformamide or dimethyl sulfoxide, using sulfuric acid as catalyst pre-activating polymer NaOH/ethanol. Furthermore, solid-st...

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