pantothenic acid
A Dictionary of Food and Nutrition
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2005
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© A Dictionary of Food and Nutrition 2005, originally published by Oxford University Press 2005. (Hide copyright information)
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pantothenic acid A vitamin of the B complex with no numerical designation. Chemically, the β‐alanine derivative of pantoic acid. Required for the synthesis of
coenzyme A (and hence essential for the metabolism of fats, carbohydrates, and amino acids) and of acyl carrier protein (and hence essential for the synthesis of fatty acids).
Dietary deficiency is unknown; it is widely distributed in all living cells, the best sources being liver, kidney, yeast, and fresh vegetables. Human requirements are not known with any certainty; the US/Canadian
adequate intake is 5 mg/day.
Experimental deficiency signs in rats include greying of the hair (hence at one time known as the anti‐grey‐hair factor; there is no evidence that it affects greying of human hair with age). Experimental deficiency in human beings leads to fatigue, headache, muscle weakness, and gastro‐intestinal disturbances. See also
burning foot syndrome.
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METHANE HYDRATES:TIMOTHY S. COLLETT
Transcript from: Congressional Testimony; 5/25/1999; 700+ words
; ...recovery. II. Gas Hydrate Occurrence and...Characterization Gas hydrates are naturally...included in the hydrate structure, methane hydrates appear to be...Arctic gas-hydrate studies shows...regions, gas hydrates may exist at...
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METHANE HYDRATE RESOURCES RESEARCH:WILLIAM P. DILLION
Transcript from: Congressional Testimony; 5/12/1999; 700+ words
; ...recovery. II. Gas Hydrate Occurrence and...Characterization Gas hydrates are naturally...included in the hydrate structure, methane hydrates appear to be...Arctic gas-hydrate studies shows...regions, gas hydrates may exist at...
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METHANE HYDRATE RESOURCES RESEARCH:GERALD D. HOLDER
Transcript from: Congressional Testimony; 5/12/1999; 700+ words
; ...330: Methane Hydrate Research and...research on methane hydrates for more than...of methane in hydrate form, such substitution...Methane from hydrates (or other sources...injected into the hydrate bearing strata causing hydrates to melt and produce...
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METHANE HYDRATES:BILAL U. HAQ
Transcript from: Congressional Testimony; 5/25/1999; 700+ words
; ...methane trapped in hydrates, or the associated free gas beneath the hydrate stability zone...the world where hydrates have been drilled...tremors may also cause hydrates to slump along zones...weakness. When a hydrate dissociates, its...
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METHANE HYDRATES:ROBERT H. TRENT
Transcript from: Congressional Testimony; 5/25/1999; 700+ words
; ...cubic feet of gas in hydrates. The Prudhoe Bay-Kuparuk River gas hydrate accumulation is estimated...economic production of gas hydrates. An additional comparison...permafrost associated gas hydrates, relative to marine gas hydrate accumulations, often...
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Clathrate hydrates of Natural Gases
Magazine article from: Chemical Engineering Progress; 5/1/1999; ; 700+ words
; ...of the Center for Hydrate Research at the...leading researcher on hydrates, has written a...occurrence of gas hydrates is controlled by...position of the hydrate/gas boundary is...often confused with hydrates. The book comes...one to estimate hydrate formation at equilibrium...
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Methane hydrates: clean energy from the sea; Methane hydrates contain enough methane to provide the natural gas needs of the United States for a hundred years.(POWERING THE FUTURE)(Survey)
Magazine article from: Advanced Materials & Processes; 6/1/2007; ; 700+ words
; ...suitable for solid hydrate formation. The...crust as methane hydrates along the oceans...measure the extent of hydrate fields, methane...the sediment. How hydrates form Gas hydrates...is colder. Gas hydrates also form beneath...most natural gas hydrate is stored in ocean...
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METHANE HYDRATES:ROBERT S. KRIPOWICZ
Transcript from: Congressional Testimony; 5/25/1999; 700+ words
; ...1753, the Methane Hydrate Research and Development...1999. What Are Methane Hydrates? Simply put, a methane hydrate is a cage-like lattice...the New Interest in Hydrates? If only I percent of the methane hydrate resource could be made...
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Gas Hydrate Exploration and Production: Dispelling the Myths
Magazine article from: Gastips; 4/1/2006; ; 700+ words
; ...natural gas from hydrates will require an...the nature of gas hydrate formation and occurrences...relationship of gas hydrates to their host sediments...literature on gas hydrates has debated the total volume of gas hydrate in the world, and...
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Gas Hydrate Storage Process for Natural Gas
Magazine article from: Gastips; 1/1/2005; ; 700+ words
; ...density dry hydrate; and * natural gas hydrates are stored and...natural gas in gas hydrates with a minimum of labor. A simple hydrate formation/storage...nucleation of hydrates and achieve appreciable...system. Even after hydrate nucleation is...
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Chloral hydrate
Encyclopedia entry from: Gale Encyclopedia of Mental Disorders
Chloral hydrate Definition Chloral hydrate is a drug that is used to help sedate persons before and after...It is also available under its generic name. Purpose Chloral hydrate is primarily used to help sedate persons, especially children...
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gas hydrates
Book article from: The Oxford Companion to the Earth
gas hydrates A hydrate, or clathrate...Naturally occurring gas hydrates are present in polar...marine sediments hydrate layers usually occur...indicate that methane hydrates contain twice the...fuel deposits. Hydrate breakdown contributes...
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hydrate
Book article from: The Columbia Encyclopedia, Sixth Edition
...exhibited by many hydrates. The number of molecules...present in a given hydrate is fixed. However...several different hydrates. There are four different hydrates of ferrous sulfate...sometimes called a hydrate; it contains a hydroxyl...
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Chloral Hydrate
Encyclopedia entry from: Encyclopedia of Drugs, Alcohol, and Addictive Behavior
CHLORAL HYDRATE Chloral hydrate is one of the oldest sedative agents still in use. It was made...substitute for Laudanum, an alcoholic solution of Opium. Chloral hydrate differs from the Barbiturates in that it is a simple molecule composed...
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natural gas hydrate
Book article from: A Dictionary of Earth Sciences
natural gas hydrate A type of clathrate in which a naturally...within a lattice of water ice. Such hydrates form under conditions of pressure and...MPa, often beneath permafrost . The hydrates can block gas transmission pipes and...
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