Medical research

How the body makes triglycerides

Doctors regularly warn their patients that having high levels of triglycerides, a major dietary fat, can increase the risk of heart disease, diabetes, obesity and fatty liver disease. There is considerable interest in finding ...

Medical research

'Off-road' mode enables mobile cells to move freely

Leukocytes instantly move out of your blood vessels to the site of inflammation after an injury. Similarly, cancer cells, which can originate in any tissue or organ, can also spread and reproduce far away from their place ...

Medical research

Protein shredder regulates fat metabolism in the brain

A protein shredder that occurs in cell membranes of brain cells apparently also indirectly regulates the fat metabolism. This is shown by a recent study by the University of Bonn. The shredder, known as gamma-secretase, is ...

Diseases, Conditions, Syndromes

Tobacco smoking increases lung entry points for COVID-19 virus

Researchers at Baylor College of Medicine, the University of South Carolina and other institutions have identified tobacco smoking as a potential risk factor for infection of the COVID-19 virus.

Medical research

New route of assembly and ionic channel traffic in cardiac cells

Ionic channels—integral proteins in the cell membrane—are essential in several processes such as cardiac activity, nervous transmission, cell proliferation and the regulation of blood pressure. A study now published in ...

Neuroscience

Structural protein may be new marker of depression

Scientists have zeroed in on a structural protein as a new target for the diagnosis and treatment of depression, according to research recently published in JNeurosci.

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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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