Temat: membrane transport - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Derivation of the formula for the filtration coefficient by application of Poiseuilles law in membrane transport
Autorzy:: Jarzynska, M
Pietruszka, M.
Powiązania:: https://bibliotekanauki.pl/articles/59171.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Botaniczne
Tematy:: mathematical analysis
membrane
filtration coefficient
Kedem-Katchalsky equation
viscosity coefficient
membrane transport
Poiseuille's law
Opis:: On the basis of Kedem-Katchalsky equations a mathematical analysis of volume flow (Jv) of a binary solution through a membrane (M) is presented. Two cases of transport generators have been considered: hydrostatic (Δp) as well as osmotic (Δπ) pressure difference. Based on the Poiseuille's law we derive the formula for the membrane filtration coefficient (Lp) which takes into account the membrane properties, kinetic viscosity and density of a solution flowing across the membrane. With use of this formula we have made model calculations of the filtration coefficient Lp and volume flow Jv for a polymer membrane in the case when the solutions on both sides of the membrane are mixed.
Źródło:: Acta Societatis Botanicorum Poloniae; 2009, 78, 2; 93-96
0001-6977
2083-9480
Pojawia się w:: Acta Societatis Botanicorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The role of magnesium in the supposed mechanism of anaesthesia
Autorzy:: Kiss, S.A.
Galbacs, Z.
Galbacs, G.
Powiązania:: https://bibliotekanauki.pl/articles/14886.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:: magnesium
anesthesia
fluidity
ion transport
membrane
Opis:: The anaesthetic, narcotic effect of magnesium has been discussed since the publication of Meltzer-Auger (1906), but its mechanism has not been clarified. Since then, other investigations have also been performed, but none of the publications has explained the issue. We propose a mechanism analogous to the studies made by Feinstein (1964), who examined organic compounds showing anaesthetic effects. Our view is that magnesium abridges two phospholipids of the opposite sides of the membrane through their phosphate groups. This binding results in membrane rigidity, which makes the ion permeability provided by the ion channel and/or carrier decrease or discontinue, thus the halting of the Na+, K+ and Ca2+ ion flow eventually causes an anaesthetic effect. Another possible pathway is that magnesium ions block the activity of N-methyl-D-aspartate (NMDA) receptor to control the ion channel, which also lowers the permeability of the membrane.
Źródło:: Journal of Elementology; 2006, 11, 4
1644-2296
Pojawia się w:: Journal of Elementology
Dostawca treści:: Biblioteka Nauki

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