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1

The effect of selected organometallic compounds on membrane voltage

100%
Engel G., Podolak M., Man D.
Polish Journal of Environmental Studies
|
2009
|
tom 18
|
nr 2
207-211
Our work studied the effect of selected organometallic chloride compounds on electrical properties of membrane, in the form of hydrophilic filters impregnated with lauric acid. The presence of the compounds in the membrane surroundings induced a quick increase of the membrane voltage that decreased more slowly after reaching the maximum value, and stabilized after a lapse of a specified period of time. In the case of triphenyltin, the voltage changed direction during measurement and stabilized in negative values. Based on the results obtained, it was found that the effectiveness of the interaction of the compounds studied with the membrane is highest in the case of triphenyltin chloride. The change of voltage polarization in the case of triphenyltin may denote that chlorine ions released in the dissociation process penetrated the other side the membrane.
2

The effect of cholesterol on the adsorption of organometallic compounds to the shingomieline liposome membrane

100%
Gabrielska J., Langner M., Przestalski S.
Cellular and Molecular Biology Letters
|
2002
|
tom 07
|
nr Suppl.
3

Studies of mixed monalayers of lecithin and organometallic compounds

100%
Trela Z., Przestalski S., Hladyszowski J.
Polish Journal of Environmental Studies
|
1997
|
tom 06
|
nr 4
Compression isotherms of mixed monomolecular layers at water-air interface, formed of lecithin (DPPC) and an organometallic compound (Me3PbCl, Me3SnCl, Et3PbCl, Et3SnCl) at various molar fractions (x = 0.0,0.2,0.4, 0.6, 0.8, 1.0) were studied. It was found that compression isotherms of the pure organometallic compounds (x = 1.0), in the range of mean molecular areas of 1.0 nm2 and ca. 0.15 nm2, did not show any practical increase in surface pressure. The isobaric relationship between mean molecular areas and molar fraction of an organometallic modifier are linear for most of the pressures chosen, which follows from analysis of the experimental isotherms obtained and demonstrates the ideal behaviour of the system under study. All the compounds studied form nearly ideally-behaving systems with lecithin. Presumably, the effects observed may be the result of molecular aggregation on the water phase surface, which in a mixed monolayer may lead to separation of the phases: organometallic compound - lecithin.
4

The structure-property relationships of flavonoid compounds as potential detoxicants

100%
Gabrielska J., Soczynska-Kordala M., Przestalski S.
Cellular and Molecular Biology Letters
|
2002
|
tom 07
|
nr 2
5

Pathways and determinations of organometallic compounds in the marine environment with a particular emphasis on organotin

100%
Radke B., Namiesnik J., Bolalek J.
Oceanological and Hydrobiological Studies
|
2003
|
tom 32
|
nr 3
6

Synergism in the action of flavonoids and organometallic compounds on membranes

100%
Gabrielska J., Soczynska-Kordala M., Hladyszowski J., Bakowska A., Przestalski S.
Cellular and Molecular Biology Letters
|
2002
|
tom 07
|
nr Suppl.
7

Speciation of organometallic compounds of tin, lead, and mercury

100%
Wasik A., Namiesnik J.
Polish Journal of Environmental Studies
|
2001
|
tom 10
|
nr 6
This paper presents a discussion of fundamental problems of the speciation analytics of organometallic compounds occurring at low concentration levels in samples involving a complex matrix. It points out differences in analytical procedures for speciation analyses and those for determinations of total contents of a metal present in the studied sample in a number of different species.
8

Quercetin reduces prooxidant action of organometallic compounds on lipsome membranes irradiated with UV

84%
Gabrielska J., Soczynska-Kordala M., Przestalski S.
Polish Journal of Environmental Studies
|
2004
|
tom 13
|
nr 5
We studied the effects of UV radiation on the degree of phosphatidylcholine (PC) liposome membrane oxidation in the presence of such toxic organometallic compounds (TOC) as diphenyltin dichloride (DPhT), triphenyltin chloride (TPhT), dibutyltin dichloride (DBT), tributyltin chloride (TBT), triphenyllead chloride (TPhL) and tributyllead chloride (TBL). PC liposome oxidation was also investigated in the presence of quercetin (Que) and equimolar mixtures of Que and TOC in order to determine the protective properties of this natural antioxidant with respect to liposome membrane oxidation induced by UV light. Concentration of the compounds studied was 10 µM. The degree of liposome oxidation was measured using the TBARS (Thiobarbitutric Reactive Substances) test. The sequence thus obtained of relative induction of PC oxidation due to TOC was as follows: TBT > TPhT = DBT > DPhT = TPhL > TBL. The results of studies with Que indicate its high efficacy in the antioxidative action of equimolar mixtures of Que and TOC. From our study it follows that quercetin forms complexes both with phenyl- and butyl- tin and lead compounds. A high antiradical (towards DPPH radical) activity of the associates with respect to the activity of quercetin alone was also found. This result can partly explain the antioxidative properties of Que in the studied solution, connected with their antiradical action and chelating posibility towards the organometallic compounds studied. A factor that differentiates the antioxidant activity of the complexes Que-TOC is probably their differentiated location in the liposome membrane bilayer. A factor that differentiates the antioxidant activity of the complexes Que-TOC is probably their differ­entiated location in the liposome membrane bilayer.
9

Binding effect of phenyltin and phenyllead compounds and its mixture with quercetin to the lipid bilayer: IR and HNMR study

84%
Zylka R., Gabrielska J., Przestalski S.
Cellular and Molecular Biology Letters
|
2005
|
tom 10
|
nr Suppl.
10

Preparation of soil and sediment samples for determination of organometallic compounds

67%
Dubiella-Jackowska A., Wasik A., Przyjazny A., Namiesnik J.
Polish Journal of Environmental Studies
|
2007
|
tom 16
|
nr 2
Organometallic compounds are widely used in almost all sectors of industry. As a result of emissions from natural and anthropogenic sources they are released to the environment, where they undergo a variety of conversions and interactions. Some organometallic compounds exhibit high toxicity. Organometallic compounds of mercury, tin, lead, selenium and arsenic are among the most common and hazardous compounds. Based on literature dealing with the occurrence and methods of determination of selected organometallic compounds of mercury, tin, lead, selenium and arsenic, we describe their sources, uses and the mechanism of toxicity. Fundamental problems associated with speciation analysis are discussed and the basic steps of analytical procedure used for the determination of organometallic compounds of Hg, Sn, Pb, Se, and As in soil and bottom sediments, including sample collection, preservation, storage, extraction, separation and determination, are characterized.
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