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    Wyświetlanie 1-9 z 9
    Tytuł:
    Zastosowanie polipropylenowych membran mikrofiltracyjnych do otrzymywania emulsji
    Application of polypropylene microfiltration membranes for emulsion preparation
    Autorzy:
    Białas, W.
    Leśniak, D.
    Czerniak, A.
    Kubiak, P.
    Celka, K.
    Tematy:
    emulsja
    membrany hydrofobowe
    mikrofiltracja
    emulsion
    hydrophobic membrane
    microfiltration
    Pokaż więcej
    Wydawca:
    Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
    Powiązania:
    https://bibliotekanauki.pl/articles/271002.pdf  Link otwiera się w nowym oknie
    Opis:
    Celem pracy była ocena przydatności polipropylenowych membran mikrofiltracyjnych do wytworzenia emulsji typu O/W. Emulsję przygotowano z użyciem oleju rzepakowego (faza rozproszona) oraz wodnego roztworu sorbinianu polioksyetylenu (faza rozpraszająca). Badano wpływ ilości (10-50%) oraz objętościowego strumienia przepływu fazy rozproszonej (6,4 - 32 Im 2h_1) na rozkład wielkości cząstek gotowej emulsji. Emulsję o najwęższym rozkładzie cząstek, w zakresie 0,25 - 0,5 |im, uzyskano przy 30% fazy rozproszonej oraz objętościowym strumieniu tej fazy na poziomie 6,4 Im ^h1. Badana metoda pozwoliła na wytworzenie emulsji o homogennej strukturze i zadowalającym rozkładzie wielkości kropel.
    The aim of this work was to evaluate the performance of polypropylene microfiltration membranes for O/W emulsion formation. The emulsion was composed of rapeseed oil (dispersed phase) and polyoxyethylene sorbate solution in water (dispersion medium). The effect of the amount (10-50%) and the volumetric flux (6,4 - 32 lm"2h_1) of the dispersed phase on the size distribution of emulsion droplets. The most narrow range of droplet size distribution (0,25 - 0,5 |im) was obtained when 30% of dispersed phase was used at a volumetric flux of 6,4 lm2h1. The method under investigation allowed formation of homogeneous emulsion with satisfactory droplet size distribution.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of microfiltration membrane module for ammonia removal process
    Zastosowanie mikrofiltracyjnego modułu membranowego do procesu usuwania amoniaku
    Autorzy:
    Słowikowski, M.
    Tematy:
    ammonia removal
    membrane contactor
    hydrophobic membrane
    usuwanie amoniaku
    kontaktory membranowe
    membrany hydrofobowe
    Pokaż więcej
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Powiązania:
    https://bibliotekanauki.pl/articles/127287.pdf  Link otwiera się w nowym oknie
    Opis:
    The aim of this work was to investigate the applicability of membrane distillation for ammonia removal from its aqueous solutions. The hollow-fiber, hydrophobic microfiltration membrane module was applied in order to assess its performance. The effects of different operating parameters on ammonia removal from aqueous solutions of different concentrations were investigated. Ammonia was absorbed in strong inorganic acid, in all tests that were taken.
    Przetestowano możliwość usuwania amoniaku z jego wodnych roztworów za pomocą hydrofobowego, mikrofiltracyjnego (MF) modułu membranowego wyposażonego w membrany kapilarne. Określono wpływ temperatury oraz początkowego stężenia amoniaku na szybkość jego usuwania z wodnego roztworu. W obu analizowanych przypadkach amoniak został zaabsorbowany w mocnym kwasie nieorganicznym.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon dioxide removal from MEA - water solution on PDMS tubular membrane
    Autorzy:
    Krupiczka, R.
    Rotkegel, A.
    Ziobrowski, Z.
    Tematy:
    MEA
    desorpcja
    dwutlenek węgla
    membrana hydrofobowa
    PDMS
    desorption
    carbon dioxide
    hydrophobic membrane
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/185661.pdf  Link otwiera się w nowym oknie
    Opis:
    The process of carbon dioxide removal from monoethanolamine (MEA) - water solution was investigated on Poly Di Methyl Siloxane (PDMS) hydrophobic tubular membrane with a ceramic support. The effects of feed temperature, liquid flow rate and MEA concentration on C02 mass transfer and selectivity were examined and found to be with a reasonable deviation (+/-25%) with predictions based on the multilayer film model. The membrane resistance was evaluated in separate experiments. The measured C02 mass fluxes (0.17-0.45 kg/(m2h)) were found to be independent of the MEA concentration in the feed.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alzheimers disease-related amyloid β peptide causes structural disordering of lipids and changes the electric properties of a floating bilayer lipid membrane
    Autorzy:
    Mrdenowic, Dusan
    Pieta, Piotr
    Su, Zhangfei
    Lipkowski, Jacek
    Kutner, Wlodzimierz
    Wydawca:
    Royal Society of Chemistry
    Cytata wydawnicza:
    Nanoscale Adv., 2020, 2, 3467–3480
    Opis:
    This research was supported by funding from the Polish National Science Centre, grant no. OPUS12 2016/23/B/ST4/02791, and the European Union Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie grant agreement no. 711859 and the Polish Ministry of Science and Higher Education for the implementation of an international co-nanced project in the years 2017–2021. It was also supported by a Discovery grant from the Natural Sciences and Engineering Research Council of Canada (NSERC), grant no. RG03958.
    Neurodegeneration in Alzheimer's disease is associated with disruption of the neuronal cell membrane by the amyloid β (Aβ) peptide. However, the disruption mechanism and the resulting changes in membrane properties remain to be elucidated. To address this issue, herein the interaction of amyloid β monomers (AβMs) and amyloid β oligomers (AβOs) with a floating bilayer lipid membrane (fBLM) was studied using electrochemical and IR spectroscopy techniques. IR measurements showed that both Aβ forms interacted similarly with the hydrophobic membrane core (lipid acyl chains), causing conformational and orientational changes of the lipid acyl chains, thus decreasing acyl chain mobility and altering the lipid packing unit cell. In the presence of AβOs, these changes were more significant than those in the presence of AβMs. However, respective interactions of AβMs and AβOs with the membrane hydrophilic exterior (lipid heads) were quite different. AβMs dehydrated lipid heads without affecting their orientation while AβOs changed the orientation of lipid heads keeping their hydration level intact. Electrochemical measurements showed that only AβOs porated the fBLM, thus significantly changing the fBLM electrical properties. The present results provide new molecular-level insight into the mechanism of membrane destruction by AβOs and changes in the membrane properties.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Physical properties of lipid bilayer membranes: relevance to membrane biological functions.
    Autorzy:
    Subczynski, Witold
    Wisniewska, Anna
    Tematy:
    lipid exchange
    hydrophobic barrier
    oxygen transport
    lipid unsaturation
    membrane domains
    lipid bilayer
    Pokaż więcej
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Powiązania:
    https://bibliotekanauki.pl/articles/1044298.pdf  Link otwiera się w nowym oknie
    Opis:
    Over the last 25 years one of us (WKS) has been investigating physical properties of lipid bilayer membranes. In 1991 a group led by WKS was organized into the Laboratory of Structure and Dynamics of Biological Membranes, the effective member of which is AW. Using mainly the electron paramagnetic resonance (EPR) spin-labeling method, we obtained unexpected results, which are significant for the better understanding of the functioning of biological membranes. We have developed a new pulse EPR spin-labeling method for the detection of membrane domains and evaluation of lipid exchange rates. This review will be focused on our main results which can be summarized as follows: (1) Unsaturation of alkyl chains greatly reduces the ordering and rigidifying effects of cholesterol although the unsaturation alone gives only minor fluidizing effects, as observed by order and reorientational motion, and rather significant rigidifying effects, as observed by translational motion of probe molecules; (2) Fluid-phase model membranes and cell plasma membranes are not barriers to oxygen and nitric oxide transport; (3) Polar carotenoids can regulate membrane fluidity in a way similar to cholesterol; (4) Formation of effective hydrophobic barriers to the permeation of small polar molecules across membranes requires alkyl chain unsaturation and/or the presence of cholesterol; (5) Fluid-phase micro-immiscibility takes place in cis-unsaturated phosphatidylcholine-cholesterol membranes and induces the formation of cholesterol-rich domains; (6) In membranes containing high concentrations of transmembrane proteins a new lipid domain is formed, with lipids trapped within aggregates of proteins, in which the lipid dynamics is diminished to the level of gel-phase.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of protein structure on environment : FOD model applied to membrane proteins
    Autorzy:
    Nowakowski, Piotr
    Stapor, Katarzyna
    Gądek, Krzysztof
    Roterman-Konieczna, Irena
    Konieczny, Leszek
    Fabian, Piotr
    Gubała, Tomasz
    Opis:
    The natural environment of proteins is the polar aquatic environment and the hydrophobic (amphipathic) environment of the membrane. The fuzzy oil drop model (FOD) used to characterize water-soluble proteins, as well as its modified version FOD-M, enables a mathematical description of the presence and influence of diverse environments on protein structure. The present work characterized the structures of membrane proteins, including those that act as channels, and a water-soluble protein for contrast. The purpose of the analysis was to verify the possibility that an external force field can be used in the simulation of the protein-folding process, taking into account the diverse nature of the environment that guarantees a structure showing biological activity.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Transmembrane proteins : different anchoring systems
    Autorzy:
    Stapor, Katarzyna
    Konieczny, Leszek
    Roterman-Konieczna, Irena
    Opis:
    Transmembrane proteins are active in amphipathic environments. To stabilize the protein in such surrounding the exposure of hydrophobic residues on the protein surface is required. Transmembrane proteins are responsible for the transport of various molecules. Therefore, they often represent structures in the form of channels. This analysis focused on the stability and local flexibility of transmembrane proteins, particularly those related to their biological activity. Different forms of anchorage were identified using the fuzzy oil-drop model (FOD) and its modified form, FOD-M. The mainly helical as well as β-barrel structural forms are compared with respect to the mechanism of stabilization in the cell membrane. The different anchoring system was found to stabilize protein molecules with possible local fluctuation.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
      Wyświetlanie 1-9 z 9

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