ST Segment Elevation; ST Segment Depression . General Introduction to ST, T, and U wave abnormalities. Basic Concept: the specificity of ST-T and U wave abnormalities is provided more by the clinical circumstances in which the ECG changes are found than by the particular changes themselves. Thus the term, nonspecific ST-T wave abnormalities, is frequently used when the clinical data are not available to correlate with the ECG findings.
lutein â(usually uncountable, plural luteins) ( 1 organic chemistry) A yellow carotenoid pigment, widely distributed in both plants and animals. 2  E161b when used as a food colouring.  xanthophyll.
Lutein (from the Latin luteus meaning yellow) is one of over 600 known naturally occurring carotenoids. Found in green leafy vegetables such as spinach and kale, lutein is employed by organisms as an antioxidant and for blue light absorption.Lutein is also found in egg yolks, animal fats and the corpus luteum.utein is a xanthophyll, like its sister compound zeaxanthin. It has primarily been used as a natural colorant due to its orange-red color. Lutein absorbs blue light and therefore appears yellow at low concentrations and orange-red at high concentrations.