photosystem I

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photosystem I

[′fōd·ō‚sis·təm ′wən]
(biochemistry)
One of two reaction sequences of the light phase of photosynthesis in green plants that involves a pigment system which is excited by wavelengths shorter than 700 nanometers and which transfers this energy to energy carriers such as NADPH that are subsequently utilized in carbon dioxide fixation.
References in periodicals archive ?
From August 2015 to September 2016, monthly readings of the following physiological characteristics were taken: quantum efficiency (Fv/Fm), maximum quantum yield of photosystem II (PSII) ([Y.
In the most widely accepted model, temperature and/or light stress generate ROS in Symbiodinium chloroplasts through backup of excitation energy at photosystem II; this may occur through damage to the water-splitting D1 protein of photosystem II, reduced photosystem repair, or inhibition of the dark reactions of photosynthesis (Douglas, 2003; Takahashi et al.
Cold and heat reduced photosynthesis efficiency: The photosystem II (PSII) is a large pigment protein complex in thylakoid membrane that performs the vital reactions of photosynthesis.
It is suggested that maintaining a higher Fv'/Fm' as a protective mechanism of the photosystem from photo-inhibitory damage which may lead to the repossession of photosynthesis after the plant is recovered from water stress.
Data regarding the effective quantum yield of photosystem II ([DELTA]F/Fm), non-photochemical quenching (NPQ), electron transport rate (ETR) and photochemical quenching (qP) did not differ between the plantlets cultured at different PPFDs.
To evaluate the effects of fluoride on the photosystem II (PSII) operation, parameters of chlorophyll a fluorescence were measured before the beginning of the simulations (day 1) and 24 hours after the end of the experiment (day 11).
m] is an effective parameter to monitor the efficiency of light utilization by the algae as well as to assess the efficiency and stability of the photosystem II (PSII), a major component of the photosynthetic machinery [23].
The holes of this wireless current are captured by the oxygen involving complex photosystem to oxidize water oxygen.
Several studies have shown that photosystem II (PSII) is often sensitive to UV-B and it has often been assumed to be the most sensitive photosynthetic target for UV-B.
In Pushkar's laboratory, students extracted a protein complex called Photosystem II from spinach and after they excited them with a laser and records changes in the electron configuration of their molecules.
Temperature stress effects on photosynthetic rate are well documented in the literature, which was reported to negatively impact photosystem II (PSII) (Strasser, 1997; Murata et al.