TEM of stacks of grana in chloroplast

TEM of stacks of grana in chloroplast

B110/0024

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Caption

False-colour transmission electron micrograph of stacks of grana in a chloroplast from a leaf of maize, Zea mays. The grana in chloroplasts are the sites of photosynthesis in higher plants. They bear the light-receptive green pigment chlorophyll which contains the enzymes that convert carbon dioxide & water into useful chemical energy in the presence of sunlight. Higher plants usually have 20-50 chloroplasts per cell, or about 500,000 per square millimetre of leaf surface. The black particles in this micrograph are fat droplets which act as a reserve of raw materials for production of new cell membranes. Magnification: x8700 at 35mm size. Reference: MICROCOSMOS, figure 6.13, page 116.

Release details

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