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  • 1
    Electronic Resource
    Electronic Resource
    Membrane-Mediated Control of the Bacteriorhodopsin Photocycle (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 10889-10895 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00202a007
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of Excitation Energy on the Bacteriorhodopsin Photocycle (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 4604-4610 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00181a022
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  • 3
    Electronic Resource
    Electronic Resource
    Regulation of the carotenoid content and chloroplast development by levulinic acid (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 96 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Chloroplast development and chlorophyll biosynthesis are co-regulated. To understand the mechanism of regulation of chloroplast biogenesis by chlorophyll, development of the photosynthetic apparatus was monitored during greening of etiolated barley leaf discs in the presence of levulinic acid, an inhibitor of chlorophyll biosynthesis. Although not a direct inhibitor of carotenoid biosynthesis, treatment by levulinic acid resulted in a linear reduction in both chlorophyll and carotenoid contents. Chlorophyll biosynthesis appeared to control that of carotenes. In the presence of levulinic acid, photosystem II (PSII) activity decreased while photosystem I (PSI) activity increased when expressed on a chlorophyll basis. However, the activities of both photosystem I and II decreased when expressed on a per plastid basis. As expected, in the presence of low amounts of chlorophyll, the light-harvesting chlorophyll-protein complex II (LHCPII) was not visible in Coomassie-stained gels in 20 mM levulinic acidtreated tissues, but was detected as a faint band by immunoblotting. This small amount of the LHCPII induced significant amounts of grana stacking, which was monitored as an increase in the ratio of variable to maximum fluorescence. When levulinic acid was washed from the leaf discs and the latter allowed to green in its absence, the chlorophyll and carotenoid contents and the photosynthetic activities approached the control values. Levulinic acid could be used to arrest the light-induced chloroplast development at a desired phase of greening and removed by washing the leaves to restore the developmental process without any apparent toxic effect. Results demonstrate that biosynthesis of carotenes is regulated by that of chlorophylls and extremely low amounts of the LHCPII can induce grana stacking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00194.x
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  • 4
    Electronic Resource
    Electronic Resource
    Recovery from methyl parathion-induced damage of the photosynthetic apparatus inChlorella protothecoides (1984)
    Springer
    Bulletin of environmental contamination and toxicology 32 (1984), S. 102-108 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01607471
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  • 5
    Electronic Resource
    Electronic Resource
    Detection and characterization of methyl parathion-resistantChlorella protothecoides (1983)
    Springer
    Bulletin of environmental contamination and toxicology 31 (1983), S. 369-376 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01608713
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of methyl parathion on betacyanin efflux from beet root discs (1986)
    Springer
    Bulletin of environmental contamination and toxicology 37 (1986), S. 448-452 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01607787
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  • 7
    Electronic Resource
    Electronic Resource
    Species specific chlorophyll a fluorescence-temperature profile at high temperatures in the leaves (1986)
    Springer
    Photosynthesis research 8 (1986), S. 87-92 
    Details
    ISSN: 1573-5079
    Keywords: intact leaves ; chlorophyll a fluorescence-profile at high temperatures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chlorophyll a (Chl a) fluorescence-temperature profile in the region of 20–80°C was recorded for fourteen different plant species. In all the species studied, there was a rise in the fluorescence intensity in the region of 45–50°C and around 55°C the fluorescence intensity started to decline. In four of the species (Acacia melanoxylon, Ervatamia montana, Eucalyptus tertecornius and Azardicta indica) tested, there was a secondary rise in the fluorescence intensity around 65–70°C whereas in all other species a sharp decline in the fluorescence intensity was observed at this point. These changes in the fluorescence intensity at high temperatures (65–70°C) appear to be species specific and cannot be explained either in terms of changes in the stoichiometry between the two photosystems or in terms of Chl a fluorescence emission from photosystem I (PS I) at higher temperatures. This conclusion is supported by following observations: (1) there was no definite correlation between the Chl a/Chl b ratio and the pattern of fluorescence-temperature profile at high temperatures; (2) the sun and shade plants of the same species had a similar pattern of fluorescence-temperature profile; and (3) preferential excitation of PS I did not alter the fluorescence-temperature profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028479
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  • 8
    Electronic Resource
    Electronic Resource
    Inhibition of photosystem II activity by Cu++ ion. Choice of buffer and reagent is critical (1990)
    Springer
    Photosynthesis research 23 (1990), S. 95-99 
    Details
    ISSN: 1573-5079
    Keywords: binding constant ; buffer ; chl a flourescence ; copper ; photosynthetic electron transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cupric ion (Cu++) inhibits the rate of photosystem II electron transport and the intensity of the variable part of chl a fluorescence in isolated chloroplast thylakoids. The inhibition is markedly dependent on the nature of the buffer used in the assay medium. In MES and HEPES buffers, complete inhibition of photosystem II occurs at 30 μM of Cu++, while in Tricine no inhibition occurred even at 200 μM Cu++. In other buffers used (TES, Phosphate, Tris), the efficacy of Cu++ inhibition is intermediate. The calculated binding constants are found to correspond to the observed I50 values for the six buffers used. It is concluded that the previous reports on copper inhibition, where buffers have been used indiscriminately should be reconsidered. Certain reagents such as hydroxylamine, ascorbate and diphenyl carbazide, which react with Cu++, should be avoided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00030068
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  • 9
    Electronic Resource
    Electronic Resource
    Radiationless transitions as a protection mechanism against photoinhibition in higher plants and a red alga (1986)
    Springer
    Photosynthesis research 10 (1986), S. 327-335 
    Details
    ISSN: 1573-5079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Exposure of the red alga Porphyra perforata or leaves of Phytolacca americana and Echinodorus sp. to white light equivalent to full sunlight for short periods induced large decreases of variable fluorescence measured at 695 nm at 77K. This change was not produced by photoinhibition but rather appeared to result from an inorease in the rate constant of radiationless transition in the reaction centers of photosystem II. It is proposed that this increase is related to the formation of the high energy state which serves as a photoprotective mechanism in plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00118298
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  • 10
    Electronic Resource
    Electronic Resource
    Changes in the antenna size of Photosystem I and Photosystem II in Synechococcus sp. strain PCC 7942 grown in the presence of SANDOZ 9785 — a Photosystem II inhibitor (1994)
    Springer
    Photosynthesis research 41 (1994), S. 303-313 
    Details
    ISSN: 1573-5079
    Keywords: cyanobacteria ; excitation energy ; herbicide ; photochemical apparatus ; photosynthesis ; pyridazinone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract SANDOZ 9785, also known as BASF 13.338, is a pyridazinone derivative that inhibits Photosystem II (PS II) activity leading to an imbalance in the rate of electron transport through the photosystems. Synechococcus sp. strain PCC 7942 cells grown in the presence of sublethal concentration of SANDOZ 9785 (SAN 9785) for 48 hours exhibited a 20% decrease in Chl a per cell. However, no changes were observed in the content of phycocyanin per cell, the size of the phycobilisomes or in the PS II:PS I ratio. From an estimate of PS II electron transport rate under varying light intensities and spectral qualities and analysis of room temperature Chl a fluorescence induction, it was deduced that growth of Synechococcus PCC 7942 in the presence of SAN 9785 leads to a redistribution of excitation energy in favour of PS II. Though the redistribution appears to be primarily caused by changes affecting the Chl a antenna of PS II, the extent of energetic coupling between phycobilisomes and PS II is also enhanced in SAN 9785 grown Synechococcus PCC 7942 cells. There was a reduction in the effective size of PS I antenna based on measurement of P700 photooxidation kinetics. These results indicate that when PS II is partially inhibited, the structure of photosynthetic apparatus alters to redistribute the excitation energy in favour of PS II so that the efficiency of utilization of light energy by the two photosystems is optimized. Our results suggest that under the conditions used, drastic structural changes are not essential for redistribution of excitation energy between the photosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019408
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