Sentences Containing 'acetic'
3-Thiophene acetic acid is an organic compound.
A simple example occurs with acid-base equilibria such as the "dissociation" of acetic acid, in aqueous solution.
Activity of various rumen organisms results in accumulation of various volatile fatty acids (normally, mostly acetic, propionic and butyric acids), which are partially dissociated.
Among these are wood alcohol, wood tar, and acetic acid.
At equilibrium the concentration quotient, "K", the acid dissociation constant, is constant (subject to some conditions) In this case, the forward reaction involves the liberation of some protons from acetic acid molecules and the backward reaction involves the formation of acetic acid molecules when an acetate ion accepts a proton.
For animal feed, it is used either directly or as its ammonium salt. The antibiotic Monensin is added to cattle feed to favor propionibacteria over acetic acid producers in the rumen; this produces less carbon dioxide and feed conversion is better.
Further experiments with various solvents, such as benzene and acetic acid, in addition to water, led him to believe in a simple relation between the molecular weights of a solute and the freezing-point of a solution.
Generating hydrogen. Electrogenic microorganisms consuming an energy source (such as acetic acid) release electrons and protons, creating an electrical potential of up to 0.3 volts.
However, if there is no uroporphyrinogen-III synthase present, the linear tetrapyrrole will be spontaneous cyclised into Uroporphyrinogen I, which is then converted into coproporphyrinogen I, also by uroporphyrinogen III decarboxylase The difference between the two forms, is the arrangements of the four propionic acid ("P" groups) and the four acetic acid groups ("A" groups), where non-enzyamtically conversion into uroporphyrinogen I results in an AP-AP-AP-AP symmetry, whereas the enzymatically conversion into uroporphyrinogen III lead to a reversed AP-group and hence an AP-AP-AP-PA arrangement.
If a clean glass rod is dipped into very dilute acid, such as acetic, sulphuric, or nitric acid, and then lightly touched to the tongue, it will taste sour.
In the next step the electrophilic carbon atom in the nitrilium ion is attacked by water and the proton is donated back to acetic acid.
In the presence of cobalt or manganese ions, this reaction proceeds rapidly at temperatures as mild as 40–50 °C: Large amounts of propanoic acid were once produced as a byproduct of acetic acid manufacture.
It contains ".09% vitamin B1, .048% 1-Napthyl acetic acid".
It is miscible with water, but can be removed from water by adding salt. As with acetic and formic acids, it consists of hydrogen bonded pairs of molecules as both the liquid and the vapor.
Lactic and acetic acid achieve 82% efficiency, while the values for unpretreated cellulose or glucose are close to 63%.
Propanoic acid has physical properties intermediate between those of the smaller carboxylic acids, formic and acetic acids, and the larger fatty acids.
Solvents used include acetone, methanol, ethanol, butanol, ethylene glycol, formic acid, and acetic acid.
The Beckmann solution consists of acetic acid, hydrochloric acid and acetic anhydride, and was widely used to catalyze the rearrangement.
The compound is prepared by bromination of acetic acid.
The hormone 1-Naphthyl acetic acid (NAA) does not occur naturally.
The latter may have contributed to lead poisoning among the ancient Roman aristocracy: the Roman delicacy "sapa" was prepared by boiling soured wine (containing acetic acid) in lead pots.
The oxygen atom in the hydroxyl group is stabilized by the three acetic acid molecules.
The pKa of lactic acid is low, about 3.9, versus, for example, 4.8 for acetic acid; this contributes to the considerable drop in rumen pH which can occur.
The rearrangement of acetone oxime in the Beckmann solution involves three acetic acid molecules and one proton (present as an oxonium ion).
The same computation with a hydroxonium ion and 6 molecules of water has the same result, but, when the migrating substituent is phenyl in the reaction of acetophenone oxime with protonated acetic acid, the mechanism favors the formation of an intermediate three-membered π-complex.
Types 316 and 317 are both useful for storing and handling acetic acid, especially in solutions where it is combined with formic acid and when aeration is not present (oxygen helps protect stainless steel under such conditions), though 317 provides the greatest level of resistance to corrosion.
Uroporphyrinogens are cyclic tetrapyrroles with four propionic acid groups ("P" groups) and four acetic acid groups ("A" groups).
With these benefits does come the risk of developing various wine faults, such as the development of acetic (or "volatile") acidity.
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