eyeball. 1  Photoreceptors are the cells in the retina that respond to light. Their distinguishing feature is the presence of large amounts of tightly packed membrane that contains the photopigment rhodopsin or a related molecule.
In chemical analysis,  matrix refers to the components of a sample other than the analyte of interest. The matrix can have a considerable effect on the way the analysis is conducted and the quality of the results obtained; such effects are called matrix effects. For example, the ionic strength of the solution can have an effect on the activity coefficients of the analytes.
matrix. n, pl matrices (ËmeÉªtrÉªËsiËz; Ëmae-) ËmÃ¦ or. matrixes. 1 a, substance, situation or environment in which something has its, origin takes, form or is. enclosed. (2) anatomy anatomy the thick tissue at the base of a nail from which a fingernail or toenail. developsatrix. n, pl matrices (ËmeÉªtrÉªËsiËz; Ëmae-) ËmÃ¦ or. matrixes. 1 a, substance, situation or environment in which something has its, origin takes, form or is. enclosed. (2) anatomy anatomy the thick tissue at the base of a nail from which a fingernail or toenail. develops