The snapshot is a concept in photography introduced by Eastman Kodak with their Browniebox camera in 1900: A casual photograph taken without any particular pre-arrangement, often of every day events.
The snapshot also plays a role as concept of artistic photography, see lomography.
In a general sense, snapshot has taken on the meaning of a glimpse of something.
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... these electrons are not returned to photosystem II as they would in the analogous cyclic pathway. Instead, the still-excited electrons are transferred to a photosystem I ...