1.3 V Inorganic Sequential Redox Chain with an All-Anionic Couple 1–/2– in a Single Framework

Abstract Nickel(II) salts and their coordination com pounds with ethyl 5-m ethylim idazole-4-carboxylate (emizco), [Ni(emizco)2Cl2], [Ni(emizco)2Br2], [Ni(emizco)2(H2O)2] (NO3)2 H2O · Ni(NO3)2, inhibit photosynthetic electron flow (basal, phosphorylating and uncoupled) and ATP-synthesis, therefore behave as Hill reaction inhibitors. Coordination compounds are more potent inhibitors than the salts. It was found that the target for NiCl2; NiBr2 and Ni(NO3)2 is at the b6f level. On the other hand, the complexes [Ni(Emizco)2Cl2], [Ni(Emizco)2Br2] and [Ni(emizco)2(H2O )2] (NO3)2H2O binding sites are located at QB(D1)-protein and b6f level. Therefore, they have a common inhibition site located at b6f avoiding the PQH2 oxidation. The QB inhibition site was corroborated by variable chlorophyll a fluorescence yield [V(j)]. The emizco ligand has no activity on photosynthetic electron flow.

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A new insight on elderberry anthocyanins bioactivity: Modulation of mitochondrial redox chain functionality and cell redox state

Journal of Functional Foods ◽

10.1016/j.jff.2019.03.019 ◽

2019 ◽

Vol 56 ◽

pp. 145-155 ◽

Cited By ~ 8

Author(s):

Dina Neves ◽

Patrícia Valentão ◽

João Bernardo ◽

Maria C. Oliveira ◽

Jorge M.G. Ferreira ◽

...

Keyword(s):

Redox State ◽

Redox Chain

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Genetic analysis of the methylamine redox chain from Thiobacillus versutus

Journal of Inorganic Biochemistry ◽

10.1016/0162-0134(91)84491-q ◽

1991 ◽

Vol 43 (2-3) ◽

pp. 514

Author(s):

M. Ubbink ◽

M.A.G. van Kleef ◽

D.A. Kleinjan ◽

C.W.G. Hoitink ◽

F. Huitema ◽

...

Keyword(s):

Genetic Analysis ◽

Redox Chain ◽

Thiobacillus Versutus

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Phytotoxic Action of Paraquat on the Photosynthetic Apparatus

Zeitschrift für Naturforschung C ◽

10.1515/znc-1978-9-1015 ◽

1978 ◽

Vol 33 (9-10) ◽

pp. 688-694 ◽

Cited By ~ 16

Author(s):

Peter Böger ◽

K. J. Kunert

Keyword(s):

Photosystem Ii ◽

Redox Reactions ◽

Photosynthetic Apparatus ◽

Membrane System ◽

Culture Conditions ◽

Terminal Part ◽

Photosynthetic Membrane ◽

Redox Chain ◽

Chlorophyll Bleaching ◽

Chloroplast Volume

Abstract Treatment of microalgae (Bumilleriopsis) with paraquat (1,1-dimethyl-4,4-dipyridylium dichloride) under culture conditions in the light for 20 or 160 h leads to light-induced oxygen uptake and more or less severe chlorophyll bleaching, which is accompanied by formation of malondial-dehyde. The ratio of chlorophyll to packed chloroplast volume remains about the same as that of the control, presumably indicating destruction of membranes concurrently with pigments. Unrelated to retardation of growth, degree of bleaching or to the formation of malondialdehyde quite a uniform degree of inactivation (≈ 50%) of partial redox reactions is observed in the region of photosystem II and I except for the terminal part of photosystem I (pigment 700 → NADP+) . The action of paraquat in the cell centers primarily on the photosynthetic membrane system and redox chain.

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