See Also: tautomerism(encyclopedia)
tautomerism(medicine)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
lamellar(dictionary)
Lamellar(medicine)
ichthyosis, lamellar(medicine)
lamellar keratoplasty(medicine)
lamellar phase(medicine)
lamellar granule(medicine)
lamellar ichthyosis(medicine)

lamellar cataract (medicine) and tautomerism (sh)


lamellar cataract (medicine)


lamellar cataract


A cataract in which the opacity is limited to the cortex.

Synonym: zonular cataract.


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 (―CH―C=O; see functional group) moves to the oxygen atom, making it an enol group (―C=C―OH). 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.