50.9 MB (1.8 MB compressed)
4217 x 4217 pixels
35.8 x 35.8 cm ⏐ 14.1 x 14.1 in (300dpi)
EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Nicotinamide crystals, coloured scanning electron micrograph (SEM). This is the amide of nicotinic acid. The acid and amide are both B vitamins. Nicotinamide is a component of two vital coenzymes, NAD (nicotinamide adenine dinucleotide) and its phosphate NADP, which are responsible for electron transport in cellular respiration. A deficiency of these and other B vitamins may lead to pellagra, shown by severe dermatitis, diarrhoea and depression. Sources of niacinamide include vegetables, lean meat, milk and some cereals. Magnification: x2830 when printed 10 centimetres wide.
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