exocyclic


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exocyclic

[‚ek·so′sī·klik]
(cell and molecular biology)
Pertaining to the outside of a ring structure.
References in periodicals archive ?
produced by cathode reduction, the MBT will be chemically adsorbed on the surface of the Q345 steel via the exocyclic S and N atoms, either in the form of thione or in the form of thiol structure.
The rate of diminution on exocyclic double bond, during photolysis, is faster for longer aliphatic chain containing polymers than shorter aliphatic chain containing polymers [25] attributed to folding tendency of methylene units present in the polymer chain.
There was an accompanying distortion of the exocyclic angles at C(1A) with the C(2A)-C(1A)-O(1A) bond angle of.
Therefore, in reactions of 2-aminothiazole and its 4-phenyl derivative with chloroformates, acyl halides, and anhydrides the exocyclic nitrogen is the main nucleophilic center which is in agreement with the reported literature [32].
The details of the reaction are somewhat beyond the scope of this article; essentially, normal cytosine has a C=C double bond which is sensitive to addition of a sulfate group from the bisulphite ion; this sulfate group weakens the exocyclic amine group and leads to its hydrolytic loss, thereby replacing the -NH2 with =0, which defines the difference between cytosine and uracil bases.
The aldehyde residue of abasic sites can generate an interstrand crosslink by reacting with the exocyclic amino group of a guanine base (34).
The sesquiterpene aromadendrene bears a reactive exocyclic methylene group and a cyclopropane ring which can alkylate proteins and thereby disturb the conformation of protein.
MDA is an aldehyde capable of interacting with DNA to form exocyclic adducts, including 3-(2-deoxy-[beta]-D-erythro-pentafuranosyl) pyrimido [1,2-[alpha]] purin-10(3H)-one deoxyguanosine ([M.
9 (C-7) that further confirmed the position of exocyclic double bond between C-6 and C-7.