Описание: Proceedings of the International Symposium on Photosynthesis, Primary Production and Biomass Utilization in Mediterranean-Type Ecosystems, Held in Kassandra, Greece, September 13-15, 1980
Автор: Y.P. Abrol; P. Mohanty; Govindjee Название: Photosynthesis: Photoreactions to Plant Productivity ISBN: 940105200X ISBN-13(EAN): 9789401052009 Издательство: Springer Рейтинг: Цена: 20896.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: The section on photosystems discusses 2 how photosystem I functions to produce NADPH and how photosystem II oxidizes water and releases protons through an "oxygen clock" and how intermediates between the two photosystems are produced involving a "two electron gate".
Описание: Abstract: In three consecutive years (1983, 1984, and 1985) soybeans (Glycine max L. Merr. cv Bragg) were grown from seed to maturity in six outdoor environmentally controlled plant growth chambers under natural solar irradiance. The C0 2 concentrations inside the chambers were controlled to various levels during these studies. Both field and laboratory measurements were made to investigate the effects of CO2 concentration on photosynthesis. Emphasis was placed on the response to C0 2 of ribulose 1, 5-bisphosphate (RuBP) and RuBP carboxylase (RuBPCase), the substrate and enzyme of the carbon fixation reaction in soybean. Following growth at 330 (atmospheric concentration) or 660 ul CO2 1, leaflet photosynthetic rates were always greater for the elevated Od grown plants when measured over a wide range of COn concentrations. This enhanced capacity for photosynthesis was possibly a result of changes in internal leaf anatomy, or to greater assimilate demand, or both, in the high CO- grown plants. The RuBP concentration decreased with increasing CCL, but still appeared to be greater than the active site concentration of RuBPCase. The RuBPCase activity, expressed on an area basis, was not affected by growth CCL concentration. It appears that RuBPCase and RuBP are thus not involved significantly in the enhanced photosynthetic capacity. Evaporative cooling kept leaf temperatures from reaching the higher air temperatures during studies on temperature effects on soybean grown at atmospheric and twice atmospheric concentrations of C0". Although air temperatures were increased by approximately 5 and 10 C, leaf temperatures were usually not increased more than approximately 2.5 and 4.5 C, respectively. These leaf temperature increases were not great enough to affect canopy photosynthesis or RuPBCase activity (on a chlorophyll basis) in either CCL treatment. Canopy photosynthesis was, however, greater at the higher CCL concentration. The concentration of RuBP was reduced at higher temperatures. Increasing growth CCL concentrations (from 160 to 990 jul CCL 1 ) resulted in decreasing RuBPCase activities and RuBP levels, when both were expressed on a chlorophyll basis. At the higher C0" concentrations, the concentration of RuBP appeared to approach the concentration of RuBPCase active sites. Both the apparent K (C0? ) and V of RuBPCase showed small, but statistically significant, decreases with increasing C0" Dissertation Discovery Company and University of Florida are dedicated to making scholarly works more discoverable and accessible throughout the world. This dissertation, "Effects of Carbon Dioxide on the Physiology and Biochemistry of Photosynthesis in Soybean" by William J. Campbell, was obtained from University of Florida and is being sold with permission from the author. A digital copy of this work may also be found in the university's institutional repository, IR@UF. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation.
Автор: J.C. Vogel Название: Fractionation of the Carbon Isotopes During Photosynthesis ISBN: 3540103236 ISBN-13(EAN): 9783540103233 Издательство: Springer Рейтинг: Цена: 18167.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Название: Photosynthesis in action ISBN: 0128237813 ISBN-13(EAN): 9780128237816 Издательство: Elsevier Science Рейтинг: Цена: 12961.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: Luckily, the parking lot only deleted footage every three months because of the relatively heavy flow of tourism that took place at Cramond Ghost Island during the summer months. The old man in charge of the parking lot security cameras asked us why we needed the footage. Ethan told him that I met someone there at noon on a Saturday in July and that the police needed to verify that this meeting took place on that date. The old man had to review footage of the four Saturdays in July. He grumbled as he escorted us to a small viewing room at the rear end of the parking lot. Ethan and I sat down next to the old man as he began his search. He
Автор: Katharina Brinkert Название: Energy Conversion in Natural and Artificial Photosynthesis ISBN: 3319779796 ISBN-13(EAN): 9783319779799 Издательство: Springer Рейтинг: Цена: 19564.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: This book discusses the basic principles and processes of solar energy conversion in natural photosynthesis. It then directly compares them with recent developments and concepts currently being pursued in artificial photosynthetic systems that are capable of utilizing sunlight to convert carbon dioxide and water into a chemical fuel. In this regard, the main focus is on photoelectrochemical cells, in which semiconducting photoanodes and -cathodes modified with (electro-) catalysts are used to oxidize water, produce hydrogen and reduce carbon dioxide in a monolithic device. The fundamental photochemical and photophysical processes involved are presented and discussed, along with protection mechanisms and efficiency calculations for both natural and artificial photosynthesis. In turn, key parameters that are crucial for the efficient operation of natural photosynthesis are identified. Lastly, their validity and applicability in the design of artificial solar-driven water-splitting systems are examined.
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