See Also: tautomerism(encyclopedia)
tautomerism(medicine)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
Medicine Lodge Memorial Hospital- Medicine Lodge(health)
Orthomolecular medicine (orthomolecular nutritional medicine, orthomolecular therapy)(health)
medicine(encyclopedia)
medicine man(encyclopedia)
medicine(dictionary)
medicine(2)(dictionary)
medicine(1)(dictionary)

polemoscope (medicine) and tautomerism (sh)


polemoscope (medicine)


polemoscope
<instrument> An opera glass or field glass with an oblique mirror arranged for seeing objects do not lie directly before the eye; called also diagonal, or side, opera glass.

Origin: Gr. War + -scope: cf. F. Polemoscope.

Source: Websters Dictionary


tautomerism (sh)




Existence of two or more chemical compounds that have the same chemical composition but different structures (isomers) and that convert easily from one to another.

A major class of tautomeric reactions involves exchange of a hydrogen atom between two Other atoms in the same molecule, in both cases forming a covalent bond. For example, in keto-enol tautomerism, the hydrogen atom bonded to the carbon atom in a carbonyl (keto) group (¨DCH¨DC=O; see functional group) moves to the oxygen atom, making it an enol group (¨DC=C¨DOH). The keto form predominates in many aldehydes and ketones, the enol form in phenols. Sugars (e.g., glucose) exhibit tautomerism between open (chain) forms and closed (ring) forms. See also isomerism.