Search results

1

1H NMR and spectrophotometric study of alkaline metal ion complexes with N-dansyl aza-18-crown-6

100%

Ossowski T., Sulowska1 H., Karbowiak T., Zarzeczanska D., Gierczyk B., Schroeder G.

Open Chemistry

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2006

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vol. 4

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issue 1

13-28

EN

Formation of complexes of A18C6-Dns and metal cations (Ca2+, Sr2+, Ba2+ and Mg2+) in acetonitrile has been studied by NMR, absorption and fluorescence spectroscopy and PM5 semi-empirical methods. A18C6-Dns forms stable complexes with Ca2+, Sr2+ and Ba2+ cations. The stability constants of various complexes are determined by different methods and their structures are visualised by the PM5 semi-empirical calculations.

2

Application of BDD thin film electrode for electrochemical decomposition of heterogeneous aromatic compounds

100%

Czupryniak J., Fabiańska A., Stepnowski P., Ossowski T., Bogdanowicz R., Gnyba M., Siedlecka E.

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EN

The aim of the presented study is to investigate the applicability of electrochemical oxidation of aromatic compounds containing heteroatoms, e.g. waste from production of pesticides or pharmaceutics, at a borondoped diamond (BDD) electrode. The BDD electrodes were synthesized by microwave plasma enhanced chemical vapour deposition (MW PE CVD). Investigation of the electrode surface by optical microscopy and scanning electron microscopy (SEM) confirmed that the synthesized layer was continuous and formed a densely packed grain structure with an average roughness of less than 0:5 μm. The influence of important electrochemical parameters: current density, kind of reactor, pH or mixing operation, on the efficiency of the oxidation was investigated. The fouling of electrode’s surface caused by the deposition of organic material was observed during CV and galvanostatic experiments. At low current density the oxidation rate constant k was low, but the current efficiency was relatively high. The BDD can be used successfully to remove heterogeneous aromatic compounds existing either as molecules or cations. During 4 h of electrolysis 95% of aromatic compounds were electrochemically decomposed to mineral forms. It was observed that the influence of the initial pH on mineralization was marginal.

3

First insight into microbial community composition in a phosphogypsum waste heap soil

100%

Zielińska S., Radkowski P., Ossowski T., Ludwig-Gałęzowska A., Łoś J., Łoś M.

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2017

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vol. 64

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issue 4

693-698

EN

The aim of this study was to investigate the soil microbial communities of a phosphogypsum waste heap. The soil microbial community structures can differ over time, as they are affected by the changing environmental conditions caused by a long-term exposure to different kinds of pollutions, like is the case of soil in the post-production waste area in Wiślinka (in the northern part of Poland) currently undergoing restoration. Our analyses indicated that the most abundant phyla were Proteobacteria, Acidobacteria, and Actinobacteria, and generally such an abundance is common for most of the studied soils. The most dominant class were Alphaproteobacteria, with their participation in 33.46% of the total reads. Among this class, the most numbered order was Sphingomonadales, whereas among this order the Sphingomonadaceae family was the most abundant one. The Sphingomonadaceae family is currently in the center of interest of many researchers, due to the ability of some of its members to utilize a wide range of naturally occurring organic compounds and many types of environmental contaminants. This kind of knowledge about microbial populations can support efforts in bioremediation and can improve monitoring changes in the contaminated environments.

4

Molecular modeling of singlet-oxygen binding to anthraquinones in relation to the peroxidating activity of antitumor anthraquinone drugs

84%

Liwo A., Jeziorek D., Ossowski T., Dyl D., Tempczyk A., Tarasiuk J., Nowacka M., Borowski E., Woźnicki W.

Acta Biochimica Polonica

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1995

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vol. 42

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issue 4

445-456

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1 Czupryniak J.

1 Dyl D.

1 Fabiańska A.

1 Gierczyk B.

1 Gnyba M.

1 Jeziorek D.

1 Karbowiak T.

1 Liwo A.

1 Ludwig-Gałęzowska A.

1 Nowacka M.

1 Radkowski P.

1 Schroeder G.

1 Siedlecka E.

1 Stepnowski P.

1 Sulowska1 H.

1 Tarasiuk J.

1 Tempczyk A.

1 Woźnicki W.

1 Zarzeczanska D.

1 Zielińska S.

1 Łoś J.

1 Łoś M.

1H NMR and spectrophotometric study of alkaline metal ion complexes with N-dansyl aza-18-crown-6

Application of BDD thin film electrode for electrochemical decomposition of heterogeneous aromatic compounds

First insight into microbial community composition in a phosphogypsum waste heap soil

Molecular modeling of singlet-oxygen binding to anthraquinones in relation to the peroxidating activity of antitumor anthraquinone drugs