Efficiency of light conversion by the blue-green alga Anacystis nidulans

Goedheer, J.C.; Hammans, J. W. Kleinen

doi:10.1038/256333a0

Cited by 22 publications

(6 citation statements)

References 7 publications

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“…P750 had an emission band at 760 nm (Govindjee, 1963b) that was confirmed later by Goedheer and Hammans (1975). Unfortunately, no correlation of this band with photosynthesis was found (Gassner, 1962).…”

Section: Discovery Of a New Pigment P750 In Anacystis Nidulansmentioning

confidence: 65%

“…In search of pigments, which absorb in this wavelength region, Govindjee et al ( 1961 ) discovered a new pigment, in A. nidulans , that had an absorption band at 750 nm (also, see Govindjee, 1963a ; Figure 5 ). P750 had an emission band at 760 nm (Govindjee, 1963b ) that was confirmed later by Goedheer and Hammans ( 1975 ). Unfortunately, no correlation of this band with photosynthesis was found (Gassner, 1962 ).…”

Section: Discovery Of a New Pigment P750 In Anacystis Nidulmentioning

confidence: 65%

“…Öquist ( 1974 ) found that iron-deficiency in A. nidulans increased fluorescence at 755 nm, perhaps, due to an increase in the concentration of P750. Goedheer and Hammans ( 1975 ) observed excitation energy transfer from several pigments to P750; and Hammans et al ( 1977 ), however, established that P750 actually initiated oxygen uptake in A. nidulans . Further, Hammans ( 1978 ) showed that P750 sensitized photo-oxidation of several endogenous reductants in A. nidulans ; however, these reductants did not serve as electron donors to PSI, nor were they oxidized in any Chl-sensitized reactions; there was, however, a hint that excitation of both P750 and Chl may cause the formation of singlet oxygen.…”

Section: Discovery Of a New Pigment P750 In Anacystis Nidulmentioning

confidence: 99%

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Adventures with cyanobacteria: a personal perspective

Govindjee¹

2011

Front. Plant Sci

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Cyanobacteria, or the blue-green algae as they used to be called until 1974, are the oldest oxygenic photosynthesizers. We summarize here adventures with them since the early 1960s. This includes studies on light absorption by cyanobacteria, excitation energy transfer at room temperature down to liquid helium temperature, fluorescence (kinetics as well as spectra) and its relationship to photosynthesis, and afterglow (or thermoluminescence) from them. Further, we summarize experiments on their two-light reaction – two-pigment system, as well as the unique role of bicarbonate (hydrogen carbonate) on the electron-acceptor side of their photosystem II, PSII. This review, in addition, includes a discussion on the regulation of changes in phycobilins (mostly in PSII) and chlorophyll a (Chl a; mostly in photosystem I, PSI) under oscillating light, on the relationship of the slow fluorescence increase (the so-called S to M rise, especially in the presence of diuron) in minute time scale with the so-called state-changes, and on the possibility of limited oxygen evolution in mixotrophic PSI (minus) mutants, up to 30 min, in the presence of glucose. We end this review with a brief discussion on the position of cyanobacteria in the evolution of photosynthetic systems.

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Section: Discovery Of a New Pigment P750 In Anacystis Nidulansmentioning

confidence: 65%

Section: Discovery Of a New Pigment P750 In Anacystis Nidulmentioning

confidence: 65%

Section: Discovery Of a New Pigment P750 In Anacystis Nidulmentioning

confidence: 99%

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Adventures with cyanobacteria: a personal perspective

Govindjee¹

2011

Front. Plant Sci

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“…The positive effect of turbulence can be explained in terms of lengthening the time of exposure to light of each individual cell in the suspension. Overexposure of cells to light may, however, result in lower specific rates of ammonia production, as a consequence of negative effects on general cellular metabolism, e.g., photooxidation (1,6), pigment bleaching (1), and inhibition of nitrate uptake (P. Candau, personal communication). Similar behavior related to light in response to the above factors has also been described with regard to the growth of algae (20).…”

Section: Density Of Cell Suspensionmentioning

confidence: 99%

Optimization of Conditions for Photoproduction of Ammonia from Nitrate by Anacystis nidulans

Ramos

Guerrero

Losada

1982

Appl Environ Microbiol

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The effect of several relevant environmental factors influencing the photoproduction of ammonia from nitrate by Anacystis nidulans cells treated with the glutamine synthetase inhibitor L-methionine-DL-sulfoximine has been investigated. The optimal ratio between L-methionine-DL-sulfoximine concentration (micromolar) and cell density (micrograms of chlorophyll per milliliter) was around 1, the process taking place at maximal rate at a temperature of about 40°C, within the pH range of 7 to 10. Ammonia production was stimulated by CO2 or bicarbonate and was not affected by the accumulation of ammonia in the medium up to concentrations of 30 mM. The rate of ammonia production was found to be determined by the interaction of at least four factors, namely, irradiance and the density, depth, and turbulence of the cell suspension. Ammonia photoproduction from nitrate and water represents an interesting process for the conversion of light energy into chemical energy, which can operate at high efficiency, around 30% of its theoretical maximum.

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“…The values of Kok (1952), Wesselius (1973) and Goedheer & Hammans (1975) were all obtained with batch cultures for which the maintenance energy is unknown. If the maintenance energy : were significant then the T/Q values would exceed the 7/ values.…”

Section: The Quantum Demands Of Growing Cellsmentioning

confidence: 99%

Untitled

1986

New Phytologist

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Efficiency of light conversion by the blue-green alga Anacystis nidulans

Cited by 22 publications

References 7 publications

Adventures with cyanobacteria: a personal perspective

Adventures with cyanobacteria: a personal perspective

Optimization of Conditions for Photoproduction of Ammonia from Nitrate by Anacystis nidulans

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