• Webster's Revised Unabridged Dictionary
    • n Guanidine (Physiol. Chem) A strongly alkaline base, NH2.CNH.NH2, formed by the oxidation of guanin, and also obtained combined with methyl in the decomposition of creatin. Boiled with dilute sulphuric acid, it yields urea and ammonia.
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In literature:

C., when the thiourea first formed is converted into guanidine thiocyanate, 2CS(NH2)2=HN:C(NH2)2.HCNS+H2S.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 6" by Various
Examples are nickel sulphate (NiSO4.6H2O), guanidine carbonate ((CH5N3)2H2CO3), strychnine sulphate ((C21H22N2O2)2.H2SO4.6H2O).
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various

In news:

Is guanidine hydrochloride corrosive to stainless steel.
Is SS 316L compatible with 6 Molar guanidine hydrochloride of pH 4.

In science:

In vitro, the transition between the various phases is controlled by temperature, pH, denaturant agent (such as urea or guanidine).
Protein folding and heteropolymers