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achondroplasia

Overview page. Subjects: medicine and health — chemistry.

A form of dwarfism (chondrodystrophia fetalis) in which there is a failure of endochondral ossification caused by an autosomal dominant mutation in the gene for the fibroblast growth factor...

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AChE

Overview page. Subjects: chemistry.

abbr. for acetyl cholinesterase.

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achromic point

Overview page. Subjects: chemistry.

The point in time during the action of amylase on starch at which the reaction mixture no longer gives a colour with iodine, i.e. the reaction has proceeded to the ...

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achröodextrin

Overview page. Subjects: chemistry.

Any dextrin that is small enough not to give a colour with iodine.

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acid

Overview page. Subjects: chemistry.

1 Any substance that when dissolved in water releases positively charged hydrogen ions and produces a corrosive solution having a pH of less than 7. Compare alkali.

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acid anhydride

Overview page. Subjects: chemistry.

Compounds that react with water to form an acid. For example, carbon dioxide reacts with water to give carbonic acid:CO2(g)+H2O(aq)⇌H2CO3(aq) A particular group of acid anhydrides are...

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acid-base catalysis

Overview page. Subjects: chemistry.

Catalysis of a chemical reaction in which either an acid ora base mediates the formation of a reactive intermediate.

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acid-base titration

Overview page. Subjects: chemistry.

A titration in which either acid or base is added to a solution and the progress of the titration is followed by pH measurements, either electrometrically or with the use of pH indicators.

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acid box

Overview page. Subjects: chemistry.

A peptide sequence that contains 4–8 acidic amino acid residues in a protein.

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acid dissociation constant

Overview page. Subjects: chemistry.

or

symbol: K a; the thermodynamic equilibrium constant for the dissociation of an acid. For a dilute solution of a weak acid, HA,...

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