After assuring that the infant is steady and thus capable of tolerate a full and in depth examination, the examiner should proceed in a step-sensible manner, considering the state and tolerance of the toddler. Near the centre of the spectrum the sensitivity of the attention is maximal and in the areas round 495 nm (blue-green) and 595 nm (orange-yellow) wavelength differences as small as 1 nm can be detected. In the presence of benzoic acid or sodium benzoate, the number of induced mutations increased with the length of publicity to sunlight
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