News tagged with membrane

Related topics: cells , cell membrane

Synapses always on the starting blocks

While neurons rapidly propagate information in their interior via electrical signals, they communicate with each other at special contact points known as the synapses. Chemical messenger substances, the neurotransmitters, ...

Oct 27, 2014
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Intestinal barrier damage in multiple sclerosis

The present study investigates whether the function of the intestines is also attacked in MS. The results, obtained from a disease model of MS in mice, shows inflammation and changes in the barrier function of the intestines ...

Sep 04, 2014
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Lipids boost the brain

Consuming oils with high polyunsaturated fatty acid content, in particular those containing omega-3s, is beneficial for the health. But the mechanisms underlying this phenomenon are poorly known. Researchers ...

Aug 11, 2014
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For cancer patients, sugar-coated cells are deadly

(Medical Xpress)—Every living cell's surface has a protein-embedded membrane that's covered in polysaccharide chains – a literal sugar coating. On cancer cells, this coating is especially thick and pronounced.

Jun 26, 2014
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Control of secretory trafficking in neurons

(Medical Xpress)—Neuroscience typically proceeds by trimming back previous overly dogmatic statements. Such is the case with new findings that proteins are locally manufactured to order throughout an extended ...

Jun 18, 2014
popularity 4.9 / 5 (10) | comments 3 report

Membrane

A membrane is a layer of material which serves as a selective barrier between two phases and remains impermeable to specific particles, molecules, or substances when exposed to the action of a driving force. Some components are allowed passage by the membrane into a permeate stream, whereas others are retained by it and accumulate in the retentate stream.

Membranes can be of various thickness, with homogeneous or heterogeneous structure. Membrane can also be classified according to their pore diameter. According to IUPAC, there are three different types of pore size classifications: microporous (dp < 2nm), mesoporous (2nm < dp < 50nm) and macroporous (dp > 50nm). Membranes can be neutral or charged, and particles transport can be active or passive. The latter can be facilitated by pressure, concentration, chemical or electrical gradients of the membrane process. Membranes can be generally classified into three groups: inorganic, polymeric or biological membranes. These three types of membranes differ significantly in their structure and functionality.

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