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Selectively microwave-permeable membrane susceptor systems - Patent 5185506 Such selectively permeable membranes are characterized by the ability to inherently protect an absorbing coating deposited thereon, or a food product located adjacent to the membrane from excessive microwave energy and inductive heating resulting therefrom, while simultaneously providing a source of conventional, convective or conductive, infrared heating to the food product. As before, by selecting a specific material, thickness, width and pitch of the reflecting regions, the amount of the field of the microwave field that is reflected relative the amount of the field that is transmitted can be highly controlled. A selectively permeable reflecting coating 88 is deposited on absorbing coating 84. freepatentsonline.com /5185506.html   (7714 words)

Selectively permeable asymmetric membranes suitable for use in hemodialysis and processes for manufacturing such ... Selectively permeable asymmetric membranes are disclosed which are suitable for use in hemodialysis processes and the like. The membrane of claim 1 wherein said hydrophilic polymer is selected from the group consisting of polyvinylpyrrolidone, polyethyleneglycol, polyglycolmonoester, copolymers of polyethyleneglycol with polypropyleneglycol, water soluble cellulosic derivatives, polysorbate, and polyethylene-polypropylene oxide copolymers and mixtures thereof. Selectively permeable (also referred to as permselective) asymmetric membranes are particularly advantageous when used in connection with various types of medical treatments, such as hemodialysis, hemofiltration, plasmapheresis, and immunotherapy. www.freepatentsonline.com /4935141.html   (4610 words)

Selectively Permeable Membranes Selectively permeable membrane: A membrane that allows only certain materials to cross it. Permeable membrane: A membrane that allows all materials to cross it. Osmosis is the diffusion of water through a selectively permeable membrane. educ.queensu.ca /~science/main/concept/is/i01/I01CDRG1.html   (595 words)

Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane which will allow certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion". The rate of passage depends on the pressure, concentration and temperature of the molecules or solutes on either side, as well as the permeability of the membrane to each solute.Depending on the membrane and the solute, permeability may depend on solute size, solubility, properties, or chemistry. Membranes used in reverse osmosis are typically made out of polyimide, chosen primarily for its permeability to water and relative impermeability to various dissolved impurities including salt ions and other small molecules that cannot be filtered. www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=selectively_permeable   (341 words)

Cell permeable Rho Inhibitor (CT04) The Exoenzyme C3 Transferase from Clostridium botulinum is commonly used to selectively inactivate the GTPases RhoA, RhoB, and RhoC, both in vivo and in vitro. Cell Permeable Rho Inhibitor is supplied as a white lyophilized powder. Cells treated with Cell Permeable C3 Transferase can be subjected to any one of a number of assays that indicate a decrease in Rho activity, including focal adhesion or stress fiber (Cat. www.cytoskeleton.com /products/g-prot/ct04.html   (1024 words)

Osmosis - Wikipedia, the free encyclopedia Osmosis is the diffusion of a liquid (most often assumed to be water, but it can be any liquid solvent) through a partially-permeable membrane from a region of low solvent potential to a region of high solvent potential. The selectively-permeable membrane must be permeable to the solvent, but not to the solute, resulting in a pressure gradient across the membrane. Consider a permeable membrane, such as visking tubing, with apertures small enough to allow water molecules, but not larger molecules, to pass through. en.wikipedia.org /wiki/Osmosis   (1114 words)

Semipermeable membrane - Wikipedia, the free encyclopedia Scheme of semipermeable membrane during hemodialysis, where red is blood, blue is the dialysing fluid, and yellow is the membrane. A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane which will allow certain molecules or ions to pass through it by diffusion and occasionally specialised "facilitated diffusion". An example of a semi-permeable membrane is a lipid bilayer, on which is based the plasma membrane that surrounds all biological cells. en.wikipedia.org /wiki/Semipermeable_membrane   (186 words)

Shaped articles which are composed of a copolymer containing fluorine groups and which are selectively permeable to ... The present invention relates to shaped articles which are composed of a synthetic copolymer containing fluorine groups and which, in their original state, are permeable to liquids and gases and are simultaneously oleophobic and oleophilic, and also to the use of shaped articles of this type. By virtue of their biological acceptibility and their stability, the said films are also suitable as permeable coatings or media for the uptake and subsequent release of, for example, therapeutic agents, catalysts or other active compounds and substances, for example, the liberation of insulin from implanted cell cultures encased in a membrane. Thus the permeability of an open-pore form of the shaped article according to the first variant can also be modified by the measures quoted only to the extent that a shaped article having pores of a smaller diameter and thus a higher selectivity is formed thereby. www.freepatentsonline.com /4557955.html   (5366 words)

Selectively permeable membrane invention   (Site not responding. Last check: ) However, due to the selectively permeable characteristics of membrane 12, imaging fluid 18 is hindered from flowing through membrane 12 such that imaging fluid 18 does not flow outwardly of container 16 through gas vent 24 and does not contaminate or otherwise damage imaging device 10. The addition of selectively permeable membrane 12 to lid 14 further enhances the fluid flow inhibiting characteristics of gas vent 24. These properties allow membrane 12 to selectively inhibit or regulate the flow of fluid therethrough, such that imaging fluid 18 may not seep or flow through gas vent 24, even during periods of high stress, such as during impact, vibration or altitude changes during transport. www.freshpatents.com /Selectively-permeable-membrane-dt20060727ptan20060165935.php   (1943 words)

About Us - Intellectual Property The invention contemplates positioning a drug delivery device in a body passageway or within body tissue and then selectively introducing a selected drug so that it is transported across a drug transport wall of the device for direct contact with the passageway all or body tissue. The invention contemplates positioning a drug delivery device in a body passageway and then selectively introducing a selected drug so that the device is expanded in order to dilate the passage and then simultaneously causing the drug to be transported across a drug transport wall of the device for direct contact with the passageway wall. A selectively inflatable member is also in fluid communication with the lumen, and is formed from a membrane. www.advpoly.com /AboutUs/IntellectualProperty.aspx   (1629 words)

Osmosis The selectively-permeable membrane must be permeable to the solvent, but not to the solute, resulting in a pressure gradient across the membrane. However, it can be artificially opposed by increasing the pressure in the section of high solute concentration with respect to that in the low solute concentration. Consider a permeable membrane, such as visking tubing, with apertures small enough to allow water molecules, but not larger molecules, to pass through. www.dejavu.org /cgi-bin/get.cgi?ver=93&url=http://articles.gourt.com/%22http%3A%2F%2Farticles.gourt.com%2F%3Farticle%3DOsmotic   (1009 words)

Small Molecule Transport The selectively permeable plasma membrane regulates the type and rate of molecular traffic into and out of the cell. For example, if two solutions of different concentrations are separated by a selectively permeable membrane that is permeable to water but not the solute, water will diffuse from the hypoosmotic solution to the hypertonic solution. In one type of osmometer, pure water is separated from a solution by a selectively permeable membrane that is permeable to water by not solute. home.earthlink.net /~dayvdanls/CampOLs/MemTransport.html   (1663 words)

Preparation of a selectively permeable membrane for an enzyme electrode (US5034330) A selectively permeable membrane for an enzyme electrode is prepared by forming a mixture of an emulsion of resin containing at least one prepolymer or monomer having ethylenic unsaturation, and a water-soluble polymer material, and subjecting the mixture to irradiation with ionizing or ultraviolet irradiation. The selectively permeable membrane is situated between the immobilized enzyme membrane, which is in contact with a sample solution, and the electrically conductive base. an immobilized enzyme membrane formed on the outer surface of the selectively permeable membrane, wherein the enzyme is capable of producing the substance which can permeate the selectively permeable membrane which substance must pass through the selectively permeable membrane to contact the electrically conductive base. www.delphion.com /details?pn10=US05034330   (341 words)

Explain Osmosis (diffusion of water) will occur across a selectively permeable cell membrane from the side of the dilute solution to the side of the concentrated solution.] Therefore, certain molecules needed by cells can only cross the cell membrane if the special proteins for those molecules are embedded in the phospholipid bilayer of that cell. Channel proteins thus exhibit selectivity and competition due to the characteristics of the openings and the entrances and exits of the openings. So all cells are selectively permeable but they all allow different molecules to enter or leave via their cell membranes. www.usd.edu /~bgoodman/Explain.html   (3494 words)

Diffusion and Osmosis   (Site not responding. Last check: ) selectively permeable, allowing water to freely pass through but regulating the movement of solutes. Osmosis is a type of diffusion, the diffusion of water through a selectively permeable membrane from a region where it is highly concentrated to a region where its concentration is lower. Describe a selectively permeable membrane, and explain its role in osmosis. biology.dbs.umt.edu /biol101s04/labs/Wyrick_s04/4_diffusion_Osmosis.htm   (1803 words)

Ensemble Keeps out Toxic Agents, Allows Sweat to Escape - U.S. Department of Defense Transformation News Story   (Site not responding. Last check: ) She said the Department of Homeland Security is interested in adopting a version of the suit, and services now using the joint service lightweight integrated suit technology may eventually see a selectively permeable membrane ensemble in their inventories as cost decreases, and its performance and long-term durability is proven. Selectively permeable membranes in testing proved to be liquid-proof and protect better after contact with a toxic agent, and because they don't adsorb various everyday contaminants, the new ensemble suffers less degradation. The new materials also were more resistant to aerosol, liquid and solid agents for improved protection, according to Burke, and because the new technology is usually thinner and lighter than a comparable adsorptive material, the garment is lighter, leaner and less of a burden to wear. www.defenselink.mil /transformation/articles/2005-11/ta111705a.html   (544 words)

The Cell Membrane and Diffusion Lab Permeable:  when a substance passes through a membrane, the membrane is said to be permeable to that substance. Selectively permeable:  If the membrane lets some substances pass and not others, it is said to be selectively permeable. Isotonic:  the same concentration of water on both sides of a selectively permeable membrane.  Rate of diffusion is constant and equal in both directions. www.quasar.ualberta.ca /edse456/apt/labs/diffusion.htm   (1749 words)

Frequently Asked Questions - Membrane Technology and Research, Inc. The permeate is recycled to the compressor; the residue stream is vented or reused. Small molecules are selectively permeated because they diffuse through the membrane more rapidly than large molecules. The membrane selectively permeates the organic compound, producing a concentrated permeate stream that contains the organic component of interest and an organic-depleted residue stream. www.mtrinc.com /Pages/FAQ/faqs.html   (969 words)

Newborn rabbit blood-brain barrier is selectively permeable and differs substantially from the adult.   (Site not responding. Last check: ) Newborn rabbit blood-brain barrier is selectively permeable and differs substantially from the adult. In contrast to suggestions of an immature barrier in young animals, these studies indicate that a sophisticated, selective BBB is operative at birth. Furthermore, the specific selectivity and dramatic increases seen for certain metabolites imply a vital function in the newborn for these carrier systems. www.arclab.org /medlineupdates/abstract_7452231.html   (168 words)

Osmosis and Diffusion - A Tutorial Cellophane food wrap serves this purpose because it is permeable to the smaller water molecules but impermeable to the larger protein molecules. Osmosis again occurs because a concentration gradient exists and the membrane is permeable to water molecules; however, diffusion of solute does not occur even though a concentration exists because the membrane is impermeable to the large protein molecule. A membrane which is selectively permeable allows certain molecules to pass through but not others. www.mun.ca /biology/Osmosis_Diffusion/tutor2.html   (2560 words)

Lab One: Diffusion and Osmosis When two solutions of different osmotic concentration on each side of a selectively permeable membrane, the pressure generated due to the water passing through is called osmolatiry and is measured in molarity. Osmotic potential is the tendency for water to move from a lower concentration of solutes to a higher concentration of solute or from a higher concentration of water to a lower concentration of water between a selectively permeable membrane. Starch was not able to go through the permeable membrane because it was too big of a molecule, hence selectively permeable membrane. www.niles-hs.k12.il.us /amilef/APReviewOut/MaggieWongLab1/MaggieWongLab1.htm   (1333 words)

Blood Iron Removal for Suffers of Hemochromatosis Using a Selectively Permeable Molecularly Imprinted Polymer Dialysis ... The Johns Hopkins University Applied Physics Laboratory has developed filters with selectively permeable molecularly imprinted polymers that are capable of sequestering only targeted molecules such as nitrates, phosphates and iron. The JHU/APL Selectively Permeable Molecularly Imprinted Polymer Membranes for Nitrates and Phosphates are applicable to any water filtration facility. The membrane that selects and filters iron from the blood could be employed in conjunction with transfusion devices. www.jhuapl.edu /ott/technologies/technology/articles/P01734.asp   (544 words)

Ionic Basis of Resting Potential Therefore, any ion to which the membrane is permeable is not in equilibrium which means that there must be net movement of the ion across the membrane. Because of this complex movement of ions, it’s relatively difficult to predict the membrane potential of the cell from the equilibrium potential of the various ions to which the cell is permeable. Biology membranes are much more permeable to ions (about 10,000 times) than pure lipid bilayers which suggests that it’s the protein in biological membranes that’s responsible for selective permeability. www.lclark.edu /~reiness/neurobiology/Lectures/lecture3.htm   (3105 words)

CHAPTER 8 MEMBRANE STUCTURE AND FUNCTION To work properly with active enzymes and appropriate permeability, membranes must be about as fluid as salad oil. Because membranes are selectively permeable, the interactions of the molecules with the membrane play a role in the diffusion rate. Diffusion of molecules of limited permeability through the lipid bilayer may be assisted by transport proteins. www.lavc.cc.ca.us /Huang/6Unit2/07_LectureOutline_LO.htm   (3574 words)

Osmosis Lab CONCEPT Cell membranes are selectively (or semi) permeable to water. OBJECTIVES The student will be able to conclude from their own data that cell membranes are selectively permeable and that water moves from areas of high concentration to areas of low concentration within cells. Select five carrots and five pieces of potato that are approximately the same size. www.lhs.logan.k12.ut.us /~asemadeni/osmosis.htm   (497 words)

Scientific Method Watch this animation of water molecules moving across a selectively permeable membrane. Water molecules are the small blue shapes, and the solute is the green. Selectively Permeable - membranes that allow some things through, the cell membrane is selectively permeable, water and oxygen move freely across the cell's membrane, by diffusion www.biologycorner.com /bio1/diffusion.html   (460 words)

osmosis lab example 2 This is the diffusion of water through a selectively permeable membrane from a region of higher water potential to a region of lower water potential. The starch didn’t leave the beaker because its color was amber and the starch molecule was much too large to pass through the selectively permeable membrane. The coloration showed that the Iodine Potassium Iodide was small enough to pass through the pores of the membrane because the color of this indicator moved from within the beaker to in the bag. sps.k12.ar.us /massengale/osmosis_lab_example_2.htm   (2602 words)

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