News tagged with membrane
'Tall order' sunlight-to-hydrogen system works, neutron analysis confirms
Researchers at the Department of Energy's Oak Ridge National Laboratory have developed a biohybrid photoconversion system -- based on the interaction of photosynthetic plant proteins with synthetic polymers ...
Feb 03, 2011 |
4.4 / 5 (20) |
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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 |
4.8 / 5 (18) |
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Researchers discover what cancer cells need to travel
(PhysOrg.com) -- Cancer cells must prepare for travel before invading new tissues, but new Cornell research has found a possible way to stop these cells from ever hitting the road.
Feb 22, 2012 |
4.9 / 5 (14) |
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Unique salt allows energy production to move inland
Production of energy from the difference between salt water and fresh water is most convenient near the oceans, but now, using an ammonium bicarbonate salt solution, Penn State researchers can combine bacterial ...
Technology / Energy & Green Tech
Mar 01, 2012 |
4.5 / 5 (15) |
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First macro-scale thin-film solid-oxide fuel cell demonstrated
(PhysOrg.com) -- Materials scientists at the Harvard School of Engineering and Applied Sciences (SEAS) and SiEnergy Systems LLC have demonstrated the first macro-scale thin-film solid-oxide fuel cell (SOFC).
Nanotechnology / Nanomaterials
Apr 04, 2011 |
4.8 / 5 (14) |
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High-purity hydrogen generated from a single device
(PhysOrg.com) -- There are many ways to generate hydrogen, such as water electrolysis and steam reforming of gas, but the hydrogen produced by these methods tends to be combined with other byproduct and residual ...
Oct 07, 2011 |
4.5 / 5 (15) |
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How plants sense touch, gravity and other physical forces
(PhysOrg.com) -- At the bottom of plants' ability to sense touch, gravity or a nearby trellis are mechanosensitive channels, pores through the cells' plasma membrane that are opened and closed by the deformation ...
Oct 21, 2011 |
4.3 / 5 (15) |
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Want fuel cells? Think outside the hydrogen tank
(PhysOrg.com) -- When most people hear the words "fuel cell," they think of eco-friendly, hydrogen-powered cars that emit nothing more than water.
Technology / Energy & Green Tech
Nov 18, 2011 |
4.9 / 5 (13) |
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Scientists create cell assembly line
Borrowing a page from modern manufacturing, scientists from the Florida campus of The Scripps Research Institute have built a microscopic assembly line that mass produces synthetic cell-like compartments.
Mar 03, 2011 |
4.9 / 5 (12) |
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Cell membrane is patterned like a patchwork quilt
(Phys.org) -- As the interface between the cell and its environment, the cell membrane, which consists of fats and proteins, fulfils a variety of vital functions. Scientists at the Max Planck Institute of ...
May 05, 2012 |
4.5 / 5 (13) |
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Brain function linked to birth size in groundbreaking new study
Scientists have discovered the first evidence linking brain function variations between the left and right sides of the brain to size at birth and the weight of the placenta. The finding could shed new light on the causes ...
Medicine & Health / Medical research
Feb 18, 2011 |
4.4 / 5 (12) |
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New discovery could change the face of cell-biology research
Rewrite the textbooks and revisit old experiments, because there's a new cog in our cellular machinery that has been discovered by researchers from the University of Alberta and the University of Cambridge Institute for Medical ...
Oct 11, 2011 |
4.2 / 5 (12) |
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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 |
4.5 / 5 (11) |
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Study uncovers key mechanisms of cell communication
(PhysOrg.com) -- A unique bridging process may be behind a mystery of intracellular communication, according to new Cornell research published Feb. 4 in the journal Cell.
Feb 07, 2011 |
4.8 / 5 (9) |
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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 |
4.4 / 5 (8) |
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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.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
