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Transactions: INTERNATIONAL JOURNAL of ENERGY and ENVIRONMENT
Transactions ID Number: 19-897
Full Name: Tomas Navratil
Position: Researcher
Age: ON
Sex: Male
Address: J. Heyrovský Institute of Physical Chemistry of AS CR, v.v.i., Department of Biophysical Chemistry, Dolejškova 3, 182 23 Prague 8
Country: CZECH REPUBLIC
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E-mail address: tomas.navratil@jh-inst.cas.cz
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Title of the Paper: Transport of heavy metals across the supported phospholipid bilayers
Authors as they appear in the Paper: Tomas Navratil,IvanaSestakova,Vladimir Marecek
Email addresses of all the authors: tomas.navratil@jh-inst.cas.cz,ivana.sestakova@jh-inst.cas.cz
Number of paper pages: 10
Abstract: As it has been reported in many scientific as well as popular papers, TV, newspapers etc., practically all parts of environment (air, waters, and soils, plants, animals, etc.) have been in increased levels contaminated with various metals, inorganic or organic compounds and species. This effect can be explained as result of human activities in many cases. In combination with pollutions brought about by natural events (volcano eruptions, forest fires, etc.), the human being is fundamentally affected in this respect. To start their negative (or positive) role in plants or in human body, the elements, the compounds and the other species, which are present in polluted environment, must be transported into these organisms, more precisely, into their cells. In other words, each pollution particle, which takes part further in metabolic processes, must be transported across the cell membranes. Similar processes are realized in the opposite way – out of the cells as well as!
in and out of any sub cellular structure. Detail elucidation of transport mechanisms is prerequisite for understanding of distribution of pollutants in real cells of more complex organisms (leaves, roots or the whole plants, animals or men) and for their possible control in the future. Because the real bio-membranes and the transporting processes realized across them are very complicated, the model membranes have been used for elucidation of the basic transporting steps. This article deals with simulation, characterization, description, and elucidation of the above mentioned transport processes on the example of some heavy (hazardous) metals, i.e., of cadmium and of lead. Because cations of these metals do not exist only as separate ions, it is necessary to take into account their existence in complexes. Therefore the attention was paid to their complexes with low molecular weight organic acids (LMWOAs) and their transporting processes. This contribution summarizes the res!
ults achieved using supported phospholipid model membranes. The ion ch
annels, which are responsible for transport of some particles across the cell membranes, were replaced in the reported experiments by ionophores (valinomycin and calcimycin). The tested membranes and processes were characterized using electrochemical methods (electrochemical impedance spectroscopy, cyclic voltammetry, anodic stripping voltammetry, conductometry, etc.) and optical spectroscopy. This manuscript presents new knowledge in this field, first part of which was presented one year ago at this conference.
Keywords: Cell membrane, Charged particles, Electrochemistry, Environment, Ion channels, Ionophores, Phospholipid bilayers, Protoplasts, Trace elements, Voltammetry.
EXTENSION of the file: .doc
Special (Invited) Session: Supported phospholipid bilayers and transport of heavy metals across them
Organizer of the Session: 202-189
How Did you learn about congress: Prof. Robert Kalvoda, D.Sc.: Kalvoda@jh-inst.cas.cz, Ing. Stepanka Vlckova, Ph.D.: stepanka.vlckova@lf1.cuni.cz, Mgr. Karolina Mrazova: mrazova.karolina@vfn.cz
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