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photosystem

British

/ ˈfəʊtəʊˌsɪstəm /

noun

botany either of two pigment-containing systems, photosystem I or II, in which the light-dependent chemical reactions of photosynthesis occur in the chloroplasts of plants

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The late stage, occurring approximately 2 billion years ago, further optimized the capacity to harvest far-red light by evolving a second modified photosystem incorporating chlorophyll f at critical locations.

From Science Daily • Nov. 28, 2023

In addition, they developed a modified photosystem that could use this pigment to power the oxygen release reaction using only the lower energy red light.

From Science Daily • Nov. 28, 2023

Bell, A. J., Frankel, L. K. & Bricker, T. M. High yield non-detergent isolation of photosystem I-light-harvesting chlorophyll II membranes from spinach thylakoids: implications for the organization of the PS I antennae in higher plants.

From Nature • Apr. 24, 2018

A photon strikes photosystem II to initiate photosynthesis.

From Textbooks • Apr. 25, 2013

As the electron from the electron transport chain arrives at photosystem I, it is re-energized with another photon captured by chlorophyll.

From Textbooks • Apr. 25, 2013

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023