News tagged with membrane
No entry without protein recycling: Researchers discover new coherence in enzyme transport
The group of Prof. Dr. Ralf Erdmann at the Ruhr-Universität Bochum, Germany, discovered a connection of peroxisomal protein import and receptor export. In the Journal of Biological Chemistry, they disclo ...
Feb 10, 2012 |
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Decoding the molecular machine behind E. coli and cholera
Scientists from Queen Mary, University of London have discovered the workings behind some of the bacteria that kill hundreds of thousands every year, possibly paving the way for new antibiotics that could treat infections ...
Feb 09, 2012 |
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Solvay hails world's largest fuel cell of type in Flanders, one can power 1,400 homes
Chemicals giant Solvay hailed Monday the successful entry into service in Flanders of what it said was the largest fuel cell of its type in the world.
Technology / Energy & Green Tech
Feb 06, 2012 |
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Rearranging the cell's skeleton: Small molecules at the cell's membrane enable cell movement
Cell biologists at Johns Hopkins have identified key steps in how certain molecules alter a cell's skeletal shape and drive the cell's movement.
Feb 02, 2012 |
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A step closer to understanding, averting drug resistance
(Medical Xpress) -- The multidrug transporter EmrE functions as an asymmetric antiparallel dimer (molecule with two subunits). Drug (blue) transport from the inside to the outside of the cell membrane is accomplished ...
Jan 31, 2012 |
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The secret life of proteins: Researchers discover dual role of key player in immune system
Northwestern University Feinberg School of Medicine researchers have identified a new and unusual role for a key player in the human immune system. A protein initially believed to regulate one routine function within the ...
Jan 28, 2012 |
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Oral temperature changes in head and neck cancer patients predicts side effect severity
Slight temperature increases of the oral mucus membranes early in a head and neck cancer patient's chemotherapy and radiation therapy (chemoradiotherapy) treatment is a predictor of severe mucositis later in treatment, according ...
Jan 26, 2012 |
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Envelope for an artificial cell
(PhysOrg.com) -- Chemists have taken an important step in making artificial life forms from scratch. Using a novel chemical reaction, they have created self-assembling cell membranes, the structural envelopes ...
Jan 25, 2012 |
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Membrane fusion a mystery no more
The many factors that contribute to how cells communicate and function at the most basic level are still not fully understood, but researchers at Baylor College of Medicine have uncovered a mechanism that helps explain how ...
Jan 24, 2012 |
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DGK-alpha helps cancer cells gain traction and mobilize
Metastasizing cancer cells often express integrins that provide better traction. A new study in The Journal of Cell Biology reveals how a lipid-converting enzyme helps the cells mobilize these integrins.
Jan 23, 2012 |
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Physicists cool semiconductor by laser light
Researchers at the Niels Bohr Institute have combined two worlds – quantum physics and nano physics, and this has led to the discovery of a new method for laser cooling semiconductor membranes. Semiconductors ...
Jan 22, 2012 |
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Notre Dame researchers report fundamental malaria discovery
A team of researchers led by Kasturi Haldar and Souvik Bhattacharjee of the University of Notre Dame's Center for Rare and Neglected Diseases has made a fundamental discovery in understanding how malaria parasites cause deadly ...
Jan 20, 2012 |
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How immune cells move against invaders
UCSF scientists have discovered the unexpected way in which a key cell of the immune system prepares for battle. The finding, they said, offers insight into the processes that take place within these cells and could lead ...
Jan 19, 2012 |
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Unveiling malaria's 'invisibility cloak'
The discovery by researchers from the Walter and Eliza Hall Institute of a molecule that is key to malaria's 'invisibility cloak' will help to better understand how the parasite causes disease and escapes from the defenses ...
Jan 18, 2012 |
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Some breast cancer spread may be triggered by a protein, study shows
Cancers rarely are deadly unless they evolve the ability to grow beyond the tissues in which they first arise. Normally, cells -- even early-stage tumor cells -- are tethered to scaffolding that helps to restrain ...
Jan 17, 2012 |
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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.
For more information about Membrane, read the full article at
Wikipedia.
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