Thin films constructed of cellulosic or synthetic materials, which are designed to provide selective transport of solutes Widely used for hemodialysis, microfiltration, ultrafiltration and reverse osmosis, membranes may he either homogeneous or asymmetric
New technology has been developed whereby the pollutants in liquids can be removed by the use of ultra fine membranes, such as the Reverse Osmosis method in the treatment of fresh potable water, or membranes in the treatment of polluted water or effluents
A flexible layer surrounding a cell, organelle (such as the nucleus), or other bodily structure The movement of molecules across a membrane is strictly regulated in both directions
The surface of a cell is a cell membrane Many of the internal organelles of the cell are themselves surrounded by membranes which are very similar to the outer surface
Thin, flexible film of proteins and lipids that encloses the contents of a cell; it controls the substances that go into and come out of the cell Also, a thin layer of tissue that covers the surface or lines the cavity of an organ
Semi-fluid structure which bounds all cells, and partitions the interior of eukaryotic cells It consists primarily of two lipid layers, with proteins "dissolved" in the lipids
A membrane is a sheet-like 2 dimensional object, an object with area but very little or no thickness Good examples are sheets of paper or a piece of surround wrap Membranes can be flat or curved; rough or smooth
1 A phospholipid bilayer that forms a hydrophobic barrier around and within cells 2 A sheet of nylon, nitrocellulose, or similar material that is used to create a replica of a gel for Southern blots, Northern blots, or Western blots
a flexible or semi-flexible material, which functions as the waterproofing component in a roofing or waterproofing assembly, and whose primary function is the exclusion of water
A thin layer or fold of tissue, usually supported by a fibrous network, serving to cover or line some part or organ, and often secreting or absorbing certain fluids
A thin, skin-like layer, resembling a piece of 'cling film' The peritoneum is a natural membrane used as the dialysis membrane in peritoneal dialysis In haemodialysis, the dialysis membrane is a plastic membrane inside the dialyser
(cell membrane; phospholipid bilayer) A planar structure surrounding cells and organelles within eukaryotic cells (e g membranes of cell nucleus of mitochondrion) separating aqueous compartments which carry out different metabolic processes Cell membranes are electrical insulators but permeable to hydrophobic molecules such as steroidal hormones and small gases (carbon dioxide, molecular oxygen, nitric oxide) All other water soluble and charged molecules depend on the presence of membrane proteins which provide transport pathways across the phospholipid bilayer
A membrane is a thin piece of skin which connects or covers parts of a person's or animal's body. In biology, the thin layer that forms the outer boundary of a living cell or of an internal cell compartment. The outer boundary is the plasma membrane, and the compartments enclosed by internal membranes are called organelles. Biological membranes have a dual function: separation of vital but incompatible metabolic processes conducted in the organelles; and passage of nutrients, wastes, and metabolic products between organelles and between the cell and the outside environment. Membranes consist largely of a double layer of lipids in which are embedded large proteins, many of which transport ions and water-soluble molecules across the membrane. See also cytoplasm, eukaryote