Biological solar energy conversion approaches to overcome yield stability and product limitations. Progress report no. 6, 1 October 1977-31 March 1978

Technical Report · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6313351

Kok, B; Fowler, C F; Radmer, R J; Velthuys, B V

A series of experiments were performed in which the authors monitored chlorophyll fluorescence in parallel with the mass spectrometer gas exchange measurements. It was observed that the fluorescence yield is not significantly altered when O2, rather than CO2, was the terminal electron acceptor, and it was concluded that the state of the photosynthetic apparatus is not strongly affected by a changeover from CO2 fixation to O2 reduction, or vice-versa. The study of photosynthetic activities in chloroplasts and particles of corn leaves was continued. Improved rates of photosystem I sheath particles were obtained. The feasibility of measuring the relative contents of system I and system II photocenters in spinach and maize chloroplasts has been examined. Measurements at 430nm with detergent-treated material indicate that the bundle sheath chloroplasts have 70 percent more system I than do spinach chloroplasts. To measure system II content, two methods have been used. In one, the flash-induced trans-membrane electrical field is used as a probe. Another method measures 'C-550' to indicate Q, the primary acceptor of system II. The second method appears more reliable than the first and indicates that bundle sheath chloroplasts contain 40% less system II than spinach chloroplasts.

• Research Organization: Martin Marietta Labs., Baltimore, MD (USA)
• OSTI ID: 6313351
• Report Number(s): PB-284823
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
551000 -- Physiological Systems
553000 -- Agriculture & Food Technology
59 BASIC BIOLOGICAL SCIENCES
60 APPLIED LIFE SCIENCES
BINDING ENERGY
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL PATHWAYS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CELL CONSTITUENTS
CEREALS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHLOROPHYLL
CHLOROPLASTS
COMPARATIVE EVALUATIONS
CONVERSION
CRYOGENIC FLUIDS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
ENERGY CONVERSION
FERMIONS
FLUIDS
FLUORESCENCE
FOOD
GRAMINEAE
GRASS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
LEAVES
LEPTONS
LUMINESCENCE
MAIZE
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
REACTION KINETICS
REDOX REACTIONS
SOLAR ENERGY CONVERSION
SPINACH
SYNTHESIS
VALENCE
VEGETABLES
YIELDS