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.
Row matrix: A matrix that has only one row. Column matrix: Amatrix that has only one column. Augmented matrix of the system: A matrix derived from a. system of linear equations (each written in standard form. with the constant term on the right) Coefficient matrix of the system: the matrix derived from. the coefficients of the system (but not including the.