Hydrostatic Pressure Effects on Photosynthesis

Vidaver, William

doi:10.1002/iroh.19690540505

Cited by 13 publications

(1 citation statement)

References 51 publications

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“…Neither experiments at high pressures (Vidaver, 1969) nor with mass spectrometer (Gerster et aI., 1972) have given results interpretable as reversible O2 reactions. The former show a reversible inhibition of O 2 formation and a lowered efficiency of energy transfer (Schreiber and Vidaver, 1973).…”

Section: A Thermodynamicsmentioning

confidence: 99%

Photosynthetic Oxygen Production

Mauzerall¹,

Piccioni²

1981

Topics in Environmental Physiology and Medicine

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Section: A Thermodynamicsmentioning

confidence: 99%

Photosynthetic Oxygen Production

Mauzerall¹,

Piccioni²

1981

Topics in Environmental Physiology and Medicine

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An apparatus to measure the rate of oxygen evolution while maintaining pO₂ constant during photosynthetic growth in closed culture vessels capable of operation at increased hydrostatic pressures

Pope¹,

Berger²

1973

Biotech & Bioengineering

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SummaryA double polarographic device is described which permits regulation of dissolved oxygen concentration at any preset pOz in suspensions or cultures of photosynthetic algae. It also simultaneously permits measurement of the rate of oxygen evolution during photosynthesis. The apparatus is designed to operate in closed vessels in the absence of a gas phase, and may be used at increased hydrostatic pressures. The device operated successfully a t all hydrostatic pressures tested up to 500 atmospheres. Regulation of oxygen levels was maintained constant a t various preset concentrations equivalent to atmospheric p 0~ values ranging between 0.02 and 0.21 at 25°C.In certain types of studies of the metabolism and growth of photosynthetic organisms the culture system must be closed. In such cultures, however, continued photosynthesis results in accumulation and hence a change in the concentration of dissolved oxygen. Since high levels of oxygen are known to be inhibitory to many photosynthetic organisms, this factor introduces an uncontrolled parameter into an experiment which may mask the biological effect being studied. I n this paper we describe a device using double polarographic electrodes which can obviate this problem by maintaining the concentration of dissolved oxygen constant.Polarographic oxygen electrodes of several designs have been used to study photosynthetic oxygen production. Haxo and Blinks' measured rapid changes in the rate of oxygen evolution of algal specimens placed in direct contact with a platinum cathode which 505

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