光系统0，一种在光-暗循环过程中合成ATP的无还原能力的祖先光系统
Photosystem 0, a proposed ancestral photosystem without reducing power that synthesized ATP during light-dark cycling
摘要：
光系统0涉及在早期进化过程中从波动的光中获得ATP自由能的原始机制。PS 0反应中心没有还原能力：电荷传输只是暂时的。光在反应中心内诱导亚稳态偶极子，产生膜电位。这反过来又通过质子移动通过ATP合成酶来驱动ATP合成。在黑暗中偶极电位衰减后，质子要么（1）通过传导穿过膜返回，要么（2）被ATP合酶泵回，在更高的H+/ATP比下反向激活为ATP酶。PS 0构成了一个链接到以前提出的免费能源的早期进化，工作在热循环。一些当代光合现象可能是PS 0的遗迹。
英文摘要：
Photosystem 0 concerns a primitive mechanism for free energy gain as ATP from fluctuating light during early evolution. The PS0 reaction centers had no reducing power: charge transport was only temporary. Light induced within the reaction centers metastable dipoles that generated a membrane potential. This in turn drove ATP synthesis by protons moving through the ATP synthase enzyme. After the decay of the dipole potential in the dark, the protons either (1) returned across the membrane by conduction or (2) were pumped back by ATP synthase, backwards active as ATPase at a higher H+/ATP ratio. PS0 constitutes a link to previously proposed free energy sources for early evolution that worked on thermal cycling. Several contemporary photosynthetic phenomena may be relics of PS0.
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