photosystem

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photosystem

(ˈfəʊtəʊˌsɪstəm)
n
(Botany) 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
References in periodicals archive ?
Research has shown that mutations of the D1 protein in the PS II complex can either increase or decrease photosynthetic activity.
With this study, the researchers wanted to assess the effects of microgravity, cosmic rays, high-energy particles, and the ionizing radiation of space on the PS II complex, photosynthesis, and plant growth.
The first case was a 75-year-old man, ASA PS II, with a history of hypertension.
The results demonstrate: (1) conversion of excess excitation energy into heat, called thermal dissipation, limits energy flux through photosystem (PS) II during development of PS II, (2) following development of maximum electron-transport potential within PS II, thermal dissipation decreases allowing for increased photochemical utilization of excitation energy, and (3) changes of the magnitude of thermal dissipation help maintain an optimal, manageable energy flux through the photosystems during the development of photochemistry.
The basis for this new building is to the existing polar research vessel be "Polarstern (PS)", the present design study on the project PS II, as well as the updated scientific and technical requirements of the users.
Further descriptions of the main tasks and technical details of the PS II will be communicated on the occasion of the invitation to submit a tender.
The same term has also been used as a synonym for the damage caused to photosystem II (PS II), but we should emphasize that this damage to PS II is considered photoinhibition when there is a decrease in the whole photosynthetic capacity and not in just one component of the photosynthetic apparatus (Long et al.
o]) decreased convexity ([theta]) in the response curve of photosynthesis to light; reduced photochemical activity of PS II (Fv/Fm, ratio of fluorescence of chlorophyll a); and, with long exposure to excess light, decreased maximum photosynthetic rate ([PS.
The goal is already in this phase the design of the client for the PS II as a basis for the award of the construction of PS II is to develop (Tender Shipyard) and others to optimize for future use by the ship management and science.
Further descriptions of the main tasks and technical details of the PS II at the solicitation of an offer will be communicated.