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<p>changes its configuration in response to sunlight, acting as a <a href="page.php?w=proton_pump">proton pump</a>. This produces a <a href="page.php?w=proton_gradient">proton gradient</a> more directly, which is then converted to chemical energy. The process does not involve carbon dioxide fixation and does not release oxygen, and seems to have evolved separately from the more common types of photosynthesis.</p>

<p><big>Photosynthetic membranes and organelles</big></p>
<p>In photosynthetic bacteria, the proteins that gather light for photosynthesis are</p><p>
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