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'Bicarbonate' in keywords Facet   section ZfN Section C  [X]
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1984 (3)
1983 (1)
1Author    J.J S Van RensenRequires cookie*
 Title    Interaction of Photosystem II Herbicides with Bicarbonate and Formate in Their Effects on Photosynthetic Electron Flow  
 Abstract    The reactivation o f the Hill reaction in C 0 2-depleted broken chloroplasts by various concen­ trations o f bicarbonate was measured in the absence and in the presence o f photosystem II herbicides. It appears that these herbicides decrease the apparent affinity o f the thylakoid membrane for bicarbonate. Different characteristics o f bicarbonate binding were observed in chloroplasts o f triazine-resistant Amaranthus hybridus com pared to the triazine-sensitive biotype. It is concluded that photosystem II herbicides, bicarbonate and formate interact with each other in their binding to the Q B-protein and their interference with photosynthetic electron transport. 
  Reference    Z. Naturforsch. 39c, 374—377 (1984); received N ovem ber 15 1983 
  Published    1984 
  Keywords    Photosynthesis, Electron Transport, H erbicides, Bicarbonate, Formate 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0374.pdf 
 Identifier    ZNC-1984-39c-0374 
 Volume    39 
2Author    HowardH R Obinson, JulianJ E Aton-R, Ye, JackJ S Van, R. Ensen, G. OvindjeeRequires cookie*
 Title    The Effects of Bicarbonate Depletion and Formate Incubation on the Kinetics of Oxidation-Reduction Reactions of the Photosystem II Quinone Acceptor Complex  
 Abstract    Chloroplast thylakoid membranes depleted o f bicarbonate exhibit a slowed oxidation o f the primary quinone acceptor (QA) by the secondary quinone acceptor (Q B) o f photosystem II. The kinetics o f these slowed reactions have been follow ed by using short xenon flashes o f light both to excite photosystem II and to probe the redox state o f Q A. Thylakoids incubated with formate but not depleted o f bicarbonate showed the sam e pattern o f slowed reaction kinetics o f the quinone acceptors as seen in bicarbonate-depleted thylakoids. This led us to conclude that there was a simple com petition between bicarbonate and formate at this site; however, steady-state electron transfer measured with an oxygen electrode showed that although the bicarbonate-depleted thylakoids were indeed inhibited, rates in the form ate-incubated thylakoids were only slightly slowed. We suggest that the inhibition seen at the quinone acceptor site o f photosystem II depends in a subtle way upon the rate o f exchange o f bicarbonate and formate at this site. 
  Reference    Z. Naturforsch. 39c, 382 (1984); received N ovem ber 14 1983 
  Published    1984 
  Keywords    Chloroplasts, Photosystem II, Bicarbonate, Formate, Plastoquinone 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0382.pdf 
 Identifier    ZNC-1984-39c-0382 
 Volume    39 
3Author    JanF H Snel, D. Irk, N. Aber, JackJ S Van, R. EnsenRequires cookie*
 Title    Formate as an Inhibitor of Photosynthetic Electron Flow  
 Abstract    The effects o f formate on the Hill reaction in isolated broken pea chloroplasts were in­ vestigated. Addition o f formate to chloroplasts has two distinct effects: I. basal electron flow can be stimulated 3-fold; 2. uncoupled electron flow is inhibited. The stim ulating effect is due to uncoupling by formate and appears instantaneous. M axim al inhibition by form ate is only observed after prolonged illumination. The inhibitory action o f form ate on electron flow can be relieved by bicarbonate *. 
  Reference    Z. Naturforsch. 39c, 386—3 (1984); received D ecem ber 21 1983 
  Published    1984 
  Keywords    Photosynthesis, Hill Reaction, Formate, Bicarbonate, Inhibition 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0386.pdf 
 Identifier    ZNC-1984-39c-0386 
 Volume    39 
4Author    Giuseppe Colacicco, A. Rthur, A. PillaRequires cookie*
 Title    Electromagnetic Modulation of Biological Processes: Bicarbonate Effect and M echanistic Considerations in the Ca-Uptake by Embryonal Chick Tibia in vitro  
 Abstract    Electromagnetically induced currents pulsating at very low frequency stim ulated calcium uptake by chick embryo tibia rudiments only when bicarbonate was present in the culture medium. A bicarbonate-dependent Ca2+-ATPase m ight be im plicated in coupling o f the electromagnetic signal with processes that promote Ca-transport and storage in bone tissue. 
  Reference    Z. Naturforsch. 38c, 465 (1983); received N ovem ber 29 1982/M arch 16 1983 
  Published    1983 
  Keywords    Pulsating Electromagnetic Fields, Ca-Uptake, O steogenesis, Bicarbonate, C a2+-ATPase 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0465.pdf 
 Identifier    ZNC-1983-38c-0465 
 Volume    38