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1Author    G. Á Bor Horváth, M. Agdolna, D. Roppa, Ágnes PuskáRequires cookie*
 Title    Fluorescence Induction Characteristics of Wild-Type and Herbicide-Resistant Strain of the Photosynthetic Bacterium Rhodobacter capsulatus  
 Abstract    Fluorescence induction characteristics have been studied in wild-type and atrazine-resistant mutant o f Rhodobacter capsulatus. Fluorescence induction was found to be a useful technique to monitor the altered electron transfer in the atrazine-resistant mutants as well as in the differ­ ent membrane fractions o f wild-type R. capsulatus. In both cases, the proportion o f the fast rise o f variable fluorescence was increased indicating the enhancement o f QA. In the mutant strain, the / 50 value o f triazine herbicide terbutryn was increased by 1 0 0 -fold whereas the natu­ ral resistance o f R . capsulatus against diuron was abolished by the mutation. 
  Reference    Z. Naturforsch. 45c, 452 (1990); received N ovem ber 9 1989 
  Published    1990 
  Keywords    Fluorescence Induction, Electron Transport, Herbicide, Purple Bacteria, Photosynthesis 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0452.pdf 
 Identifier    ZNC-1990-45c-0452 
 Volume    45 
2Author    GeorgH. Schmid, Pierre ThibaultRequires cookie*
 Title    Studies on the S-State Distribution in Euglena gracilis  
 Abstract    When Euglena gracilis is dark adapted for 10 min or more, oxygen evolution as the conse­ quence of short (5 usee) saturating light flashes does not show the picture of a damped oscillation with a periodicity o f 4, as known from the literature. The overall picture of this flash pattern is given by the fact that 0 2-evolution in the First two flashes is practically zero and rises from there onward in a continuous manner to the steady state with barely any visible oscillation at all. However, a second flash sequence fired one to two minutes after this first sequence induces an oxygen evolution pattern which is barely distinguishable from the well known usual Chlorella vulgaris pattern. The phenomenon is not influenced by changes in the oxygen tension nor do additions of chemicals like CCCP, sodium azide, or reducing agents like hydroxylamine or hydrogen peroxide substantially alter the described behavior. Deactivation experiments give the overall impression that the deactivation of the S-states is slower than with Chlorella. Hydroxylamine strongly accelerates the deactivation. The analysis of the S-state distribution in a four and five state Kok-model suggests that dark adapted Euglena is in a more reduced condition than dark adapted Chlorella. It looks as if dark adapted Euglena were in a condition which would correspond to 60 percent S_|, 30 percent S0 and 10 percent S). The experimental flash sequence of such dark adapted cells fits best a synthetic sequence when the misses are in the region of 2 0 -2 5 percent, with double hitting playing practically no role at all (the first two flashes are zero!). The impression that dark adapted Euglena starts its oxygen evolution from a more reduced state is strengthened by the analysis of room temperature fluorescence induction (Kautsky effect). It can be shown that the fluorescence induction curve o f Euglena corresponds to that of Chlorella cells provided the latter have been briefly treated with a strong reductant such as sodium dithionite. 
  Reference    Z. Naturforsch. 38c, 60—6 (1983); received September 1982 
  Published    1983 
  Keywords    Flash Yield, Oxygen, Euglena, Fluorescence Induction 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0060.pdf 
 Identifier    ZNC-1983-38c-0060 
 Volume    38 
3Author    Hiroyuki Koike, Yasuhiro Kashino, Kazuhiko SatohRequires cookie*
 Title    Interactions of Halogenated Benzoquinones with the Non-Heme Iron (Q40o) in Photosystem II  
 Abstract    Interactions o f halogenated benzoquinones with the acceptor side o f Photosystem (PS) II were studied by measuring fluorescence induction curves and flash-induced absorbance changes in PS II particles isolated from Synechococcus vulcanus. Following results were ob­ tained: 1) Addition o f some halogenated benzoquinones prior to 3-(3,4-dichlorophenyl)-l,l-dimethylurea (D C M U) in the dark increased the area above the fluorescence induction curve (work integral) by a factor o f two. 2) Based on the ability to increase the fluorescence work integral, halogenated benzoquinones could be divided into two groups. 3) 2,6-D ichlorobenzo-quinone (2,6-D C BQ), trichlorobenzoquinone (TCBQ) and tetrahalogenated benzoquinones except tetrafluorobenzoquinone (fluoranil) (group A) increased the work integral, but 2,5-D CBQ and fluoranil (group B) did not. 4) Rapid reoxidation o f QA was observed in the presence o f quinones which belong to group A. These results were interpreted in terms o f dark oxidation o f by quinones belonging to group A. Possible mechanisms o f oxidation o f Q400 by these quinones in the dark are discussed. 
  Reference    Z. Naturforsch. 48c, 168 (1993); received Novem ber 9 1992 
  Published    1993 
  Keywords    Photosystem II, Q400, Halogenated Benzoquinone, Q B-Site, Fluorescence Induction 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0168.pdf 
 Identifier    ZNC-1993-48c-0168 
 Volume    48 
4Author    Christian Holzapfel, Robert BauerRequires cookie*
 Title    Computer Simulation of Primary Photosynthetic Reactions — Compared with Experimental Results on 0 2-Exchange and Chlorophyll Fluorescence of Green Plants  
 Abstract    A computer model describing the "Z-scheme" of photosynthetic electron transport in terms of reduction and oxydation of coupled redox pools was built up. Starting from a certain initial state corresponding to the dark adapted state of the photosynthetic system the reduction and reoxidation levels of the pools were calculated during adaptation of the system to a steady state in the light. The changes of calculated redox levels were compared with experimental results of fluorescence and oxygen evolution induction curves. It is shown that the transients in prompt fluorescence and oxygen evolution can be described by reduction and reoxidation of the primary electron acceptor pool and the electron donor pool of photosystem II due to reduction and oxidation of the other pools during adaptation to light. The first depression D in the fluorescence induction curve is explained by the existence of a redox pool X between the primary electron acceptor pool Q of photosystem II and plastoquinone. It is shown that DCMU blocks the electron flow between Q and X. Furthermore, it is shown that the inhibitor DBMIB probably not only blocks the electron flow but also causes a successive disconnection of the plastoquinone pool from the electron transport chain. 
  Reference    (Z. Naturforsch. 30c, 489—498 [1975]; received March 3/April 18 1975) 
  Published    1975 
  Keywords    Primary Photosynthetic Electron Transport, Computer Simulation, Fluorescence Induction, Oxygen Exchange Transient 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0489.pdf 
 Identifier    ZNC-1975-30c-0489 
 Volume    30 
5Author    Christian HolzapfelRequires cookie*
 Title    Analysis of the Prompt Fluorescence Induction by Means of Computer Simulation of the Primary Photosynthetic Reactions  
 Abstract    The induction phenomenon of prompt fluorescence of the photosynthetic system in green plants reflects the adaptation of the electron transport system from a dark adapted state to a steady state under light condition. The appearance of the P-peak in the prompt fluorescence induction curve is explained by the decay of the electrochemical gradient across the thylakoid membrane in the dark. The decay of the electrochemical gradient in the dark is calculated using measured fluorescence induction curves with different times of dark adaptation. The influence of photophosphorylation inhibitors is discussed and the threshold effect of ATP-formation depending on the electrochemical gradient is explained by the coupling of the ATP-formation with the electron transport in the thylakoid membrane. 
  Reference    Z. Naturforsch. 33c, 402—2 (1978); received April 17 1978 
  Published    1978 
  Keywords    Primary Photosynthetic Electron Transport, Computer Simulation, Fluorescence Induction, ATP-Formation 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0402.pdf 
 Identifier    ZNC-1978-33c-0402 
 Volume    33 
6Author    N.Requires cookie*
 Title    Variable Fluorescence and Fluorescence Spectra of Algae after Herbicide-Induced Pigment Bleaching  
 Abstract    avassard V. K a ra p e ty a n 3. R eto S tra sse rb, and Peter B ö g erc a A. N. Bakh Institute o f Biochemistry, Academy of Sciences o f the USSR, Moscow; Herbicides like norflurazon, oxadiazon, or oxyfluorfen affect the pigment apparatus o f green algae. Their influence on variable (Fmax _ ^o) and initial fluorescence (F0) as well as on the state 
  Reference    Z. Naturforsch. 38c, 556 (1983); received March 23 1983 
  Published    1983 
  Keywords    Norflurazon, Oxadiazon, Oxyfluorfen, Bleaching by Herbicides, Fluorescence Induction, Spectra 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0556.pdf 
 Identifier    ZNC-1983-38c-0556 
 Volume    38