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полный	информационный	краткий

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автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>K=PCBS<.>)

Общее количество найденных документов : 4
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   R 30


    Reactivity features of polychlorobiphenyl congeners in the nucleophilic substitution reactions / T. I. Gorbunova, M. G. Pervova, V. I. Saloutin, O. N. Chupakhin // Russian Journal of General Chemistry. - 2012. - Vol. 82, № 1. - С. 138-143. - Bibliogr. : p. 143 (18 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
POLYCHLORINATED-BIPHENYLS -- IRON -- DECHLORINATION -- NANOPARTICLES -- PCBS
Аннотация: Groups of congeners and individual congeners of polychlorobiphenyls contributing to the composition of the technical mixture "Sovol" (PCB 60, PCB 64, PCB 70, PCB 74, PCB 97, PCB 101, PCB 105, PCB 110, PCB 118, PCB 138, PCB 149, PCB 156, and PCB 163) were synthesized by the reaction of aryl-aryl coupling. The interaction of the congeners with sodium methoxide was performed and their complete conversion was proved. By means of gas chromatography-mass spectrometry the PCBs methoxy derivatives were identified. The data on the reactivity of the individual polychlorobiphenyl congeners were precised

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   B 12


    Bacterial degradation of a mixture obtained through the chemical modification of polychlorinated biphenyls by polyethylene glycols / D. O. Egorova, T. I. Gorbunova, M. G. Pervova, V. A. Demakov // Applied Biochemistry and Microbiology. - 2014. - Vol. 50, № 7. - С. 722-729. - Bibliogr. : p. 729 (29 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BACTERIAL DEGRADATION -- CHEMICAL MODIFICATION -- POLYETHYLENE GLYCOLS
Аннотация: Polychlorinated biphenyls (PCBs), also known by the trade name Sovol, are toxic industrial wastes. They have been subjected to chemical treatment by polyethylene glycols (PEGs) and potassium hydroxide. As a result of the interaction of the Sovol with various molecular mass PEGs (MMPEG-4 ∼ 200, MMPEG-22 ∼ 1000), water-soluble mixtures M1 and M2 containing mono(polyethylene glycol)oxy-derivatives (PCB-PEG-4 and PCB-PEG-22), polychlorobiphenylols, and unreacted PCB congeners (PCB 44, PCB 47, PCB 49, PCB 52, and PCB 66) were obtained. It was shown for the first time that mixtures M1 and M2 are susceptible to bacterial degradation without their fractionation. According to the gas-liquid chromatography with flame-ionization and mass-spectrometric detection, the Rhodococcus wratislaviensis KT112-7 strain degraded all of the chemical compounds occurring in the mixtures. In a 5-day experiment, it was found that the KT112-7 strain decomposes mono(polyethylene glycol)oxy-derivatives completely (by 100%) and polychlorobiphenylols and PCB congeners by 90–95% in the M1 and M2 mixtures. The culture medium did not contain transformation products, whereas free chlorine ions were accumulated (72–94% of the maximum possible amount). Thus, the use of the chemical modification and consecutive bacterial degradation provided an effective destruction of technical PCB mixtures with a high content of highly chlorinated congeners

\\\\expert2\\nbo\\Applied Biochemistry and Microbiology\\2014, v.50, N 7, p.722-729.pdf
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   M 78


    Modeling of the biphenyl dioxygenase α-subunit structure of rhodococcus strains and features of the destruction of chlorinated and hydroxylated biphenyls at different temperatures / D. O. Egorova, T. I. Gorbunova, T. D. Kir’yanova [et al.] // Applied Biochemistry and Microbiology. - 2021. - Vol. 57, № 6. - P732-742

ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
RHODOCOCCUS -- BIPHENYL DIOXYGENASE -- 3,4-DICHLOROBIPHENYL -- HYDROXYBIPHENYL
Аннотация: Based on modeling of the protein structure of the α subunit of biphenyl 2,3-dioxygenase (BphA1) (EC 1.14.12.18), the key enzyme for the destruction of biphenyl and polychlorinated biphenyls (PCBs), it was found that BphA1 Rhodococcus wratislaviensis KT112-7 (= VKM Ac-2623D) had the highest level of similarity with classical biphenyl dioxygenases (BDOs) of the PCBs-degrader strains of the genus Rhodococcus. The structure of BphA1 Rhodococcus wratislaviensis CH628 had the highest similarity with naphthalene dioxygenase of the strains of the genus Rhodococcus, and the structure of BphA1 Rhodococcus ruber P25 (= IEGM 896) was unique, since no protein molecules with a high level of similarity were identified. It was shown that all of the studied strains, despite their differences in the BphA1 structure, carried out dioxygenation of the unsubstituted ring in molecules of 3,4-dichlorobiphenyl (PCB 12), as well as monochlorinated and monohydroxy-monochlorinated biphenyls (mixture P). The level of destruction of PCB 12 and mixture P was 95.4–100% at 30°C for 10 days at an initial concentration of 0.1 g/L. It was found that a change in temperature (10–50°C) had the greatest effect on the biodegradative activity of the strain R. ruber P25 (a decrease by 3.1–3.9 times). R. wratislaviensis CH628 and R. wratislaviensis KT112-7 efficiently degraded PCB 12 at temperatures of 20–40 and 10–30°C, respectively (the destruction level was 93.2–100%).

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    Bacterial degradation of PCB 70 and its hydroxy derivatives is an environmentally friendly way to destroy pops / T. D. Kir'yanova, D. O. Egorova, T. I. Gorbunova, M. G. Pervova // Bio Web of Conferences : International Scientific and Practical Conference “Innovations, Technological Solutions and Management in Modern Biotechnology and Biomedicine” (ITSM-2022). - Pushchino, 2023. - P09002
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: One of the problems of our time is the environmentally safe destruction of polychlorinated biphenyls (PCBs) and their hydroxylated derivatives. The aim of the study was to investigate the features and prospects of the decomposition of PCB 70 (2,5,3',4'-tetrachlorobiphenyl) and hydroxylated chlorobiphenyls derived from it by Rhodococcus wratislaviensis strain CH628. As a result of the application of methods of periodic cultivation, gas chromatography and light spectrometry, it was found that the efficiency of destruction of PCB 70 1 g of cells of strain CH628 was 90 mg PCB/day, and the same indicator for a mixture consisting of hydroxy derivatives obtained from PCB 70 was 56 mg PCB/day. It was shown that the strain uses all components of the mixture of hydroxy-PCB 70 as a growth substrate, but with different degradation rates. When cultivated in a mineral medium with PCB 70 or a mixture of hydroxy-PCB 70, strain CH628 forms biofilms. The analysis of the obtained results shows that the use of the Rhodococcus wratislaviensis CH628 strain will make it possible to develop a technology for the environmentally safe destruction of PCB 70 and hydroxy-PCBs derived from it.

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