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绿色植物的光合作用是利用太阳光能分解水,产生质子和电子去还原CO_2,合成有机物。氧则以分子态的O_2放出来。 2H_2O(?)4H~++4 e~-+O_2↑光合裂解水放氧是地球上O_2的最重要来源。对于这样一个重要的过程却是光合作用中人们认识最不清楚的部分,因为人们一直没有能够分离出来有这种活性的物质,因而是出名的老大难问题。六十年代初,闪光下的研究发现,每第四闪放O_2最高。所以这个过程大约有四个中间步骤。为了解释这种现象,Kok提出了一个四量子机理的假说(即S-循环):
Photosynthesis of green plants is the use of sunlight can break down water, produce protons and electrons to reduce CO_2, the synthesis of organic matter. Oxygen is released as molecular oxygen. 2H_2O (?) 4H ~ + + 4 e ~ - + O_2 ↑ PHOTOCATALYTIC RELEASE WATER Oxygen releasing is the most important source of O_2 on earth. For such an important process is the most unclear part of people’s understanding of photosynthesis, because people have not been able to separate out the material with this activity, it is a well-known chronic problem. In the early 1960s, the flash study found that each fourth flash O_2 highest. So there are about four intermediate steps in this process. To explain this phenomenon, Kok proposed a four quantum mechanism hypothesis (ie, S-loop):