Ultraweak photoemission from dark‐adapted leaves and isolated chloroplasts

Hideg, Éva; Kobayashi, Masaki; Inaba, Humio

doi:10.1016/0014-5793(90)81454-v

Cited by 32 publications

(18 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the contrary, DF has components that decay in very different time domains: in the nanoseconds (Christen et al 2000), microseconds (Jursinic and Govindjee 1977;Jursinic et al 1978;Wong et al 1978;Christen et al 1998;Mimuro et al 2007;Buchta et al 2008), milliseconds (Hipkins and Barber 1974;Barber and Neumann 1974;Zaharieva and Goltsev 2003;Goltsev et al 2005;Buchta et al 2007), seconds Hideg et al 1991;Katsumata et al 2008), and even in the hour time range (Hideg et al 1990).…”

Section: Origin Of Delayed Fluorescencementioning

confidence: 99%

Delayed fluorescence in photosynthesis

et al. 2009

View full text Add to dashboard Cite

Photosynthesis is a very efficient photochemical process. Nevertheless, plants emit some of the absorbed energy as light quanta. This luminescence is emitted, predominantly, by excited chlorophyll a molecules in the light-harvesting antenna, associated with Photosystem II (PS II) reaction centers. The emission that occurs before the utilization of the excitation energy in the primary photochemical reaction is called prompt fluorescence. Light emission can also be observed from repopulated excited chlorophylls as a result of recombination of the charge pairs. In this case, some time-dependent redox reactions occur before the excitation of the chlorophyll. This delays the light emission and provides the name for this phenomenon-delayed fluorescence (DF), or delayed light emission (DLE). The DF intensity is a decreasing polyphasic function of the time after illumination, which reflects the kinetics of electron transport reactions both on the (electron) donor and the (electron) acceptor sides of PS II. Two main experimental approaches are used for DF measurements: (a) recording of the DF decay in the dark after a single turnover flash or after continuous light excitation and (b) recording of the DF intensity during light adaptation of the photosynthesizing samples (induction curves), following a period of darkness. In this paper we review historical data on DF research and recent advances in the understanding of the relation between the delayed fluorescence and specific reactions in PS II. An experimental method for simultaneous recording of the induction transients of prompt and delayed chlorophyll fluorescence and decay curves of DF in the millisecond time domain is discussed.

show abstract

Section: Origin Of Delayed Fluorescencementioning

confidence: 99%

Delayed fluorescence in photosynthesis

et al. 2009

View full text Add to dashboard Cite

show abstract

“…For examples: non-enzymatic and enzymatic lipid peroxidation, mitochondrial respiration chain and peroxisomal reactions, oxidation of catecholamines, oxidation of tyrosine and tryptophan residues in proteins, etc. (Kruk et al, 1989;Hideg et al, 1990;Watts et al, 1995;Nakano, 2005).…”

Section: Bioluminescent Biophotons From Living Cellsmentioning

confidence: 99%

Phosphene phenomenon: A new concept

Bókkon

2008

Biosystems

View full text Add to dashboard Cite

This paper proposes a new biopsychophysical concept of phosphene phenomenon. Namely, visual sensation of phosphenes is due to the intrinsic perception of ultraweak bioluminescent photon emission of cells in the visual system. In other words, phosphenes are bioluminescent biophotons in the visual system induced by various stimuli (mechanical, electrical, magnetic, ionizing radiation, etc.) as well as random bioluminescent biophotons firings of cells in the visual pathway. This biophoton emission can become conscious if induced or spontaneous biophoton emission of cells in the visual system exceeds a distinct threshold. Neuronal biophoton communication can occur by means of non-visual neuronal opsins and natural photosensitive biomolecules. Our interpretation is in direct connection with the functional roles of free radicals and excited biomolecules in living cells.

show abstract

“…In the process of lipid peroxidation, excited species such as carbonyls and singlet-oxygen are generated during a radical chain reaction triggered by ROS, known as the Russel mechanism. These species and/or other fluorescent molecules excited through energy transfer are thought to lead to biophoton emission [54,55]. Under Cd stress, photon emissions by the non-primed leaves were higher than those of BABA-primed leaves, indicating that non-primed leaves experienced more oxidative damage.…”

Section: Discussionmentioning

confidence: 98%