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 ?
Photosynthesis, photosystem II efficiency and xanthophyll cycle in the salt-adapted halophyte Atriplex centralasiatica.
2007) Photoinhibition of photosystem II under environmental stress.
Using ultra-short x-ray flashes, they have succeeded in performing structural analyses of isolated photosynthesis molecules from plant photosystem II at room temperature.
The first photosynthetic organisms worked with only one photosystem, known as photosystem I (PSI).
Photosystem II inhibitors reduce electron flow from water to NADPH2+ at the photochemical step in photosynthesis.
PCR amplified sequences for this exercise were from the 35S promoter of the cauliflower mosaic virus (CaMV 35S) and the Photosystem II chloroplast gene (PSII).
Photosynthesis has been attracting much attention for many years due to its superior ability of transforming luminous energy to the chemical energy of plants, algae and cyanobacteria, and many researches have been performed on the crystal structure of photosystem II, the mechanisms of energy and electron transfer, and relevant artificial simulation (Nield et al.
Some of these proteins are the integral components of photosystem, cyt b/f complex or oxygen evolving complex and their absence suggested that their assembly to form a functional photosynthetic apparatus was affected in V- seedlings.
In an extreme version of the algae's quantum-mechanical trick, electrons could simultaneously take all the possible paths to a photosystem and decide after arriving which route was best.
Inhibition of photosystem 11 in isolated chloroplasts by lead.
The first chapter, an overview, is followed by chapters on the structure and function of the cyanobacterial photosystem, the atomic structure of plant photosystem, current models and mechanisms of water splitting, and the specifics of each protein complex.
Cells in the stationary and exponential growth phases exhibited optimal quinone reduction potential by photosystem II.