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  2. Membrane fluidity - Wikipedia

    en.wikipedia.org/wiki/Membrane_fluidity

    In biology, membrane fluidity refers to the viscosity of the lipid bilayer of a cell membrane or a synthetic lipid membrane. Lipid packing can influence the fluidity of the membrane. Viscosity of the membrane can affect the rotation and diffusion of proteins and other bio-molecules within the membrane, there-by affecting the functions of these ...

  3. Biological membrane - Wikipedia

    en.wikipedia.org/wiki/Biological_membrane

    Cross-sectional view of the structures that can be formed by phospholipids in an aqueous solution. A biological membrane, biomembrane or cell membrane is a selectively permeable membrane that separates the interior of a cell from the external environment or creates intracellular compartments by serving as a boundary between one part of the cell and another.

  4. Membrane transport - Wikipedia

    en.wikipedia.org/wiki/Membrane_transport

    Thermodynamically the flow of substances from one compartment to another can occur in the direction of a concentration or electrochemical gradient or against it. If the exchange of substances occurs in the direction of the gradient, that is, in the direction of decreasing potential, there is no requirement for an input of energy from outside the system; if, however, the transport is against ...

  5. Starling equation - Wikipedia

    en.wikipedia.org/wiki/Starling_equation

    Staverman's reflection coefficient, σ, is a unitless constant that is specific to the permeability of a membrane to a given solute. [6] The Starling equation, written without σ, describes the flow of a solvent across a membrane that is impermeable to the solutes contained within the solution. [7]

  6. Cell membrane - Wikipedia

    en.wikipedia.org/wiki/Cell_membrane

    Illustration of a eukaryotic cell membrane Comparison of a eukaryotic vs. a prokaryotic cell membrane. The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates and protects the interior of a cell from the outside environment (the extracellular space).

  7. Fluid mosaic model - Wikipedia

    en.wikipedia.org/wiki/Fluid_mosaic_model

    Fluid mosaic model of a cell membrane. The fluid mosaic model explains various characteristics regarding the structure of functional cell membranes.According to this biological model, there is a lipid bilayer (two molecules thick layer consisting primarily of amphipathic phospholipids) in which protein molecules are embedded.

  8. Membrane - Wikipedia

    en.wikipedia.org/wiki/Membrane

    Where Qp is the permeate stream flowrate [kg·s −1], F w is the water flux rate [kg·m −2 ·s −1] and A is the membrane area [m 2] The permeability (k) [m·s −2 ·bar −1] of a membrane is given by the next equation: = The trans-membrane pressure (TMP) is given by the following expression:

  9. Semipermeable membrane - Wikipedia

    en.wikipedia.org/wiki/Semipermeable_membrane

    The plasma membrane is very specific in its permeability, meaning it carefully controls which substances enter and leave the cell. Because they are attracted to the water content within and outside the cell (or hydrophillic ), the phosphate heads assemble along the outer and inner surfaces of the plasma membrane, and the hydrophobic tails are ...