ABSTRACT
The interaction of a number of phenolic compounds, being 'model fragments' of humic acids, with cadmium ions was investigated. The fluorescence quenching method was used to determine the complexation constants of these compounds with cadmium ions. It was established that bonding of phenolic compounds by cadmium ions at ÑÐ 7 is weak and reaches a maximum value of 15% for interaction with resorcinol. It was demonstrated that modification of humic acids by the mechanoactivation method increases by three times bonding of cadmium ions, which is caused by strengthening the acid properties of carboxyl and hydroxyl groups at the aromatic ring. Copyright © 2016 John Wiley & Sons, Ltd.
Subject(s)
Cadmium/chemistry , Fluorescence , Humic Substances , Phenols/chemistry , Hydrogen-Ion Concentration , Ions/chemistry , Molecular Structure , Spectrometry, FluorescenceSubject(s)
Cardiovascular Agents/therapeutic use , Endothelium, Vascular/physiopathology , Myocardial Ischemia/drug therapy , Ubiquinone/analogs & derivatives , Vasodilation/drug effects , Brachial Artery/diagnostic imaging , Brachial Artery/physiopathology , Chronic Disease , Dose-Response Relationship, Drug , Drug Therapy, Combination , Endothelium, Vascular/drug effects , Humans , Hydroxymethylglutaryl-CoA Reductase Inhibitors , Myocardial Ischemia/diagnostic imaging , Myocardial Ischemia/physiopathology , Treatment Outcome , Ubiquinone/administration & dosage , Ultrasonography, Doppler, Pulsed , Vitamins/administration & dosageABSTRACT
The involvement of active oxygen forms in the regulation of the expression of mitochondrial respiratory chain components, which are not related to energy storing, has been in vitro and in vivo studied in Lycopersicum esculentum L. The highest level of transcription of genes encoding alternative oxidase and NADH dehydrogenase has been observed in green tomato leaves. It has been shown that even low H2O2 concentrations activate both aoxlalpha and ndb1 genes, encoding alternative oxidase and external mitochondrial rotenone-insensitive NADH dehydrogenase, respectively. According to our results, in the case of an oxidative stress, alternative oxidase and NADH dehydrogenase are coexpressed in tomato plant tissues, and active oxygen forms serve as the secondary messengers of their coexpression.
