之间的区别Cyclic and Noncyclic Photophosphorylation

Key Difference – Cyclic vs Noncyclic Photophosphorylation

光磷酸化或光合磷酸化是一个过程ATP是在光中产生的光合作用。将磷酸盐组添加到ADPto form ATP, utilizing the proton motive force generated during the cyclic and noncyclic electron transport chains of photosynthesis. The energy is supplied by the sunlight to initiate the processes and ATP synthesis occurs on ATPase complexes located in the thylakoid membranes of thechloroplasts。ATPsynthesis during the cyclic electron flow of缺氧光合作用称为环状光磷酸化。氧光合作用的非环节电子流期间的ATP产生称为非循环磷酸化。This is the key difference between cyclic and noncyclic photophosphorylation.

CONTENTS
1。概述和关键差异
2。What is Cyclic Photophosphorylation
3。什么是非循环磷酸化
4。并排比较 - 循环与非循环光磷酸化
5.Summary

什么是环状光磷酸化？

环状磷酸化是一个过程，该过程在光合作用的光周期电子传输链中从ADP产生ATP。光系统Iis involved in this process. WhenchlorophyllsPS I吸收光能，高能电子从P700反应中心释放。这些电子被主电子受体接受，然后通过多个电子受体传播，例如铁氧还蛋白（FD），塑素酮（PQ），细胞色素复合物和塑蛋白（PC）。最后，这些电子在经过循环运动后返回P700。当电子通过电子载体下坡时，它们会释放势能。该能量用于通过ATP合酶从ADP产生ATP。因此，此过程称为环状光磷酸化。

PS IIis not involved in cyclic photophosphorylation. Hence, water is not involved in this process; as a result, cyclic photophosphorylation does not generate molecular oxygen as a byproduct. Since the electrons return to the PS I, no reducing power is generated (noNADPH）在循环光磷酸化过程中。

什么是非循环磷酸化？

非循环光磷酸化是通过光合作用的非环电子传输链使用光能合成的过程。此过程中涉及两种类型的光系统，名为PS I和PS II。非循环磷酸化由PS II引发。它吸收光能并释放高能电子。水分子通过释放在PS II附近分裂质子(H+ ions) and molecular oxygen due to the absorbed energy. High energy electrons are accepted by a primary electron acceptor and pass through plastoquinone (PQ), cytochrome complex, and plastocyanin (PC). Then those electrons are taken up by the PS I. The accepted electrons by PS I are passed again through electron acceptors and reach NADP⁺。These electrons combine with H⁺and NADP⁺to form NADPH and terminate the electron transport chain. During the electron transport chain, the released energy is used to produce ATP from ADP. Since the electrons are not returned to PS II, this process is known as noncyclic photophosphorylation.

与环状光磷酸化相比，非循环的光磷酸化是常见的，并且在所有绿色植物，藻类和蓝细菌。这是生物体的病毒过程，因为这是将分子氧释放到环境的唯一过程。

循环和非粒光磷酸化有什么区别？

循环与非循环光磷酸化
环状光磷酸化是指在光依赖光合作用的环状电子传输链中产生ATP的过程。	非周期的光合磷酸化指的是过程ss which produces ATP from noncyclic electron transport chain in light reactions of photosynthesis.
光系统
只有一个光系统（PS I）参与环状光磷酸化。	光系统I和II参与了非环状光磷酸化。
Nature of the Electron Transport Chain
电子在环状电子传输链中行驶，然后返回PS I	Electrons travel in noncyclic chains.
产品
Only ATP is produced in this process.	ATP，o2和NADPH是在此过程中产生的。
水
在此过程中，水不分流。	水分裂或光片。
产生氧气
在环状光磷酸化过程中未产生氧气	Molecular oxygen is generated in noncyclic photophosphorylation.
第一个电子供体
第一个电子供体是PSI。	水is the first electron donor.
第一个电子受体
最终电子受体是PSI。	The final electron acceptor is NADP+
有机体
某些细菌显示了环状光磷酸化。	Noncyclic photophosphorylation is common in green plants, algae, and cyanobacteria.

Summary – Cyclic vs Noncyclic Photophosphorylation

ATPis produced by the light energy absorbed during photosynthesis. This process is known as photophosphorylation. Photophosphorylation can happen via two pathways known as cyclic and noncyclic photophosphorylation. During cyclic photophosphorylation, high energy electrons travel through electron acceptors in cyclic movements and release energy to produce ATP. During noncyclic photophosphorylation, high energy electrons flow through electron acceptors in Z-shaped noncyclic movements. Released electrons do not return to the same photosystems in noncyclic photophosphorylation. However, in both processes, ATP is produced in the same manner using the potential energy released by the electron transport chain. Noncyclic photophosphorylation produces ATP, O₂，而循环光磷酸化仅产生ATP。这两个光系统都参与非环状光磷酸化，而只有一个光系统（PS I）参与环状光磷酸化。这是循环和非循环光磷酸化之间的差异。

参考：
1.“光磷酸化。”维基百科。Wikimedia Foundation，2017年4月9日。2017年5月16日。https://en.wikipedia.org/wiki/photophophophosphorylation
2. Haneef，Deena T Kochunni Jazir。“主要差异。”环状和非环状光磷酸化之间的差异。N.P.，N.D。网络。2017年5月16日。

图片提供：
1.大卫·贝拉德（David Berard）的“循环光磷酸化” - 自己的作品(CC0)通过下议院维基梅迪亚
2。“Thylakoid membrane 3” By Somepics – Own work（CC BY-SA 4.0）通过下议院维基梅迪亚