Temat: superoxide radical - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Development of an electrochemical method for the measurement of antioxidant capacity of pure compounds and natural substances extracts
Autorzy:: Lanez, T.
Rebiai, A.
Powiązania:: https://bibliotekanauki.pl/articles/411914.pdf
Data publikacji:: 2013
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: antioxidant activity
superoxide anion radical
electrochemistry
DDPH
Opis:: A new method has been developed to measure total antioxidant activity of antioxidants in foods and natural substances without use of standard antioxidants and without use of calibration curves plotting. It is based on measuring the oxidation peak current of superoxide anion radical electrochemically generated by reduction of commercial molecular oxygen in dimethylformamide. The method has been validated using 7 known standard antioxidants and the results have been compared with those obtained by the DPPH and molybdate ion reduction assays. Measured antioxidant capacities were highly correlated with those obtained using DPPH (r2 = 0.549) and molybdate ion reduction assay (r2 = 0.434).
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2013, 1; 46-54
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: H2O2 production in chloroplasts, its outward diffusion through aquaporins, and the effects of light intensity
Autorzy:: Borisova-Mubarakshina, M.
Kozuleva, M.
Rudenko, N.
Vetoshkina, D.
Naydov, I.
Ivanov, B.
Powiązania:: https://bibliotekanauki.pl/articles/81009.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: conference
hydrogen peroxide
superoxide radical
chloroplast
diffusion
thylakoid
reactive oxygen species
aquaporin
light intensity
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Stimulation by nitric oxide of gastric acid secretion in bullfrog fundic mucosa in vitro
Autorzy:: Kawauchi, S.
Sugamoto, S.
Furukawa, O.
Mimaki, H.
Takeuchi, K.
Powiązania:: https://bibliotekanauki.pl/articles/70414.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Fizjologiczne
Tematy:: histamine
stimulation
prostaglandin
superoxide radical
acid secretion
nitric oxide
bullfrog stomach
gastric acid
in vitro
secretion
bullfrog
Źródło:: Journal of Physiology and Pharmacology; 2001, 52, 1
0867-5910
Pojawia się w:: Journal of Physiology and Pharmacology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Generation of ·OH initiated by interaction of Fe2+ and Cu+ with dioxygen; comparison with the Fenton chemistry.
Autorzy:: Urbański, Norbert
Beręsewicz, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/1044216.pdf
Data publikacji:: 2000
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: superoxide dismutase
autoxidation
catalase
free radical
Fenton reaction
hydroxyl radical
iron ions
copper ions
desferrioxamine
Opis:: Iron and copper toxicity has been presumed to involve the formation of hydroxyl radical (·OH) from H2O2 in the Fenton reaction. The aim of this study was to verify that Fe2+-O2 and Cu+-O2 chemistry is capable of generating ·OH in the quasi physiological environment of Krebs-Henseleit buffer (KH), and to compare the ability of the Fe2+-O2 system and of the Fenton system (Fe2+ + H2O2) to produce ·OH. The addition of Fe2+ and Cu+ (0-20 μM) to KH resulted in a concentration-dependent increase in ·OH formation, as measured by the salicylate method. While Fe3+ and Cu2+ (0-20 μM) did not result in ·OH formation, these ions mediated significant ·OH production in the presence of a number of reducing agents. The ·OH yield from the reaction mediated by Fe2+ was increased by exogenous Fe3+ and Cu2+ and was prevented by the deoxygenation of the buffer and reduced by superoxide dismutase, catalase, and desferrioxamine. Addition of 1 μM, 5 μM or 10 μM Fe2+ to a range of H2O2 concentrations (the Fenton system) resulted in a H2O2-concentration-dependent rise in ·OH formation. For each Fe2+ concentration tested, the ·OH yield doubled when the ratio [H2O2]:[Fe2+] was raised from zero to one. In conclusion: (i) Fe2+-O2 and Cu+-O2 chemistry is capable of promoting ·OH generation in the environment of oxygenated KH, in the absence of pre-existing superoxide and/or H2O2, and possibly through a mechanism initiated by the metal autoxidation; (ii) The process is enhanced by contaminating Fe3+ and Cu2+; (iii) In the presence of reducing agents also Fe3+ and Cu2+ promote the ·OH formation; (iv) Depending on the actual [H2O2]:[Fe2+] ratio, the efficiency of the Fe2+-O2 chemistry to generate ·OH is greater than or, at best, equal to that of the Fe2+-driven Fenton reaction.
Źródło:: Acta Biochimica Polonica; 2000, 47, 4; 951-962
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modification of the deoxyribose test to detect strong iron binding
Autorzy:: Sadowska-Bartosz, Izabela
Galiniak, Sabina
Bartosz, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/1038707.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: chelation
deoxyribose test
desferrioxamine
DETAPA
EDTA
Fenton reaction
hydrogen peroxide
hydroxyl radical
iron
superoxide
Opis:: Deoxyribose test has been widely used for determination of reactivities of various compounds for the hydroxyl radical. The test is based on the formation of hydroxyl radical by Fe2+ complex in the Fenton reaction. We propose a modification of the deoxyribose test to detect strong iron binding, inhibiting participation of Fe2+ in the Fenton reaction, on the basis of examination of concentration dependence of deoxyribose degradation on Fe2+ concentration, at a constant concentration of a chelating agent.
Źródło:: Acta Biochimica Polonica; 2017, 64, 1; 195-198
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Generation of reactive oxygen species in plants during high light stress and their role in signaling
Autorzy:: Krieger-Liszkay, A.
Powiązania:: https://bibliotekanauki.pl/articles/79819.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: conference
reactive oxygen species
high light stress
plant
singlet oxygen
superoxide
hydrogen peroxide
hydroxyl radical
abiotic stress
biotic stress
photosystem II
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

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