A Study of Oxidation-Reduction Potentials in Relation to the Functions of Light and Carbon Dioxide in Chlorella Photosynthesis

Spruit, C. J. P.

doi:10.1111/j.1438-8677.1953.tb00032.x

Cited by 7 publications

(1 citation statement)

References 23 publications

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“…Nevertheless these alter the redox properties in living cells considerably, partly by their 011711 electron capacity and catalytic action and partly by their toxic effects on metabolism. Thus lllore recent attelnpts to measure redox conditions in living cells have utilized pote~ltiolnetric techniques (4,11). These techniques necessarily involve complete clisturba~lce of the natural redox orgailizatioil by bringing an electrode into co~ltact with the cell co~lteilts and the validity of the more or less stable potential established in this way is open t o serious criticism.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Oxidation–reduction Conditions in Wheat Leaf Sap by a Potentiometric Method

Kaul¹,

Shaw²

1960

Can. J. Bot.

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Estracts fro111 primary leaves of Little Club wheat, prepared ~lncler anaerobic conditions, gave osidation-reduction pote~ltials in the range of -180 mv to -110 mv a t pH 6 when measured potentiometrically with prepolarized platinum electrodes. These poorly poised potentials are believed to represent a flavin system. By mising mediators (e.g. methylene blue and riboflavin) with the extracts stable average potentials were achieved. 'l'hese ranged from -70 to +70 mv. Coleoptiles and very young primary leaves eshibited relatively low average potentials, which climbed to a steady level in 8 to 10 days after sowing. This charige was accompanied by a quantitative shift between three poising systems f o~~n d in the leaves by redos titrations. The results suggested that ascorbic acid bccomes the dominating redos systein in estracts from ~n a t~i r c leaves. At senescence, indicated by yellowing, a ncw systein dominates the redos bac1;ground. This exhibited q~~i n o n i c properties.

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Section: Introductionmentioning

confidence: 99%