False-colour scanning electron micrograph (SEM) of crystals of vitamin C (ascorbic acid). Vitamin C has a monoclinic crystal structure,characterised by three unequal axes,one pair of which are not at right angles. Most fruit & vegetables are high in vitamin C content. The average man or woman requires 70 milligrams per day; children & pregnant woman need an additional amount. A deficiency in vitamin C causes scurvy. The biochemical function of vitamin C is as a regulator in tissue respiration. Magnification: x20 at 35mm size,x30 at 6x4.5 cm size. JBU colouring: mauve & orange. Reference: MICROCOSMOS,figure 7.18,page 136 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 4525 px × 3134 px |
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