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Topic: Semipermeable

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	Sulfonated polysulfone composite semipermeable membranes and process for producing the same - Patent 4818387
		The composite semipermeable membrane of this invention having the semipermeable membrane composed of the sulfonated polysulfone is particularly excellent in chlorine resistance and pH resistance and is suitable for use as a reverse osmosis membrane or a ultrafiltration membrane.
		The performance of the composite semipermeable membrane thus obtained was 82.0% in rejection and 2.5 m.sup.3 /m.sup.2.day in flux.
		The performance of the composite semipermeable membrane thus obtained was 92.8% in rejection and 0.5 m.sup.2 /m.sup.2.day in flux.
	www.freepatentsonline.com /4818387.html (6687 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)

	ro
		Osmosis is a special case of diffusion in which all the molecules are in water, and the water crosses a barrier called a semipermeable membrane.
		Semipermeable membranes can be made of many types of materials, but typically are made of cellulose acetate or polyamide resins.
		Notice that the semipermeable membrane essentially acts as a filter for the water to pass through, and in fact reverse osmosis is sometimes called "ultrafiltration."
	www.csun.edu /~vchsc006/356b/ro.html (549 words)

	Sterilization of dialyzer - Patent 4148606
		Sterilization of a dialyzer, using a saturated and wet semipermeable membrane and irradiating said dialyzer in the presence of an antibacterial agent.
		However, it is known that cellulose, polymethyl methacrylate and polyacrylonitrile, which are preferred for use as a semipermeable membranes and enhance the performance of an artificial kidney or a dialyzer for use with a living body, have poor resistance to the effects of such irradiation.
		Many different semipermeable membranes may be used in the dialyzers treated according to the method of the present invention.
	www.freepatentsonline.com /4148606.html (4935 words)

	Dialysis - Wikipedia, the free encyclopedia
		In all types of dialysis, blood passes on one side of a semipermeable membrane, and a dialysis fluid is passed on the other side.
		By altering the composition of the dialysis fluid, the concentrations of undesired solutes (chiefly potassium and urea) in the fluid are low, but the desired solutes (for example sodium) are at their natural concentration found in healthy blood.
		In peritoneal dialysis, a special solution is run through a tube into the peritoneal cavity, the abdominal body cavity around the intestine, where the peritoneal membrane acts as a semipermeable membrane.
	en.wikipedia.org /wiki/Dialysis (1014 words)

	HighBeam Encyclopedia - dialysis (Site not responding. Last check: 2007-10-23)
		The smaller particles of sodium chloride (which dissolve in water to form sodium and chloride ions) will diffuse across the membrane; diffusion of the much larger starch particles (which are not truly in solution but are in colloidal suspension) is hindered and may be completely prevented.
		By the use of graded semipermeable membranes chosen to allow successively smaller molecules to pass, mixtures can be separated into components of graded ranges of molecular weight.
		In such machines, blood is circulated on one side of a semipermeable membrane (often cellophane) while a special dialysis fluid is circulated on the other side.
	www.encyclopedia.com /html/section/dialysis_hemodialysis.asp (623 words)

	11. Referencer, Miljøstyrelsen
		Lipid-filled semipermeable membrane devices and mussels as samplers of organochlorine compounds in lake water.
		Use of the semipermeable membrane device as an in situ sampler of waterborne bioavailable PCDD and PCDF residues at sub-parts-per-quadrillion concentrations.
		Caged mussels and semipermeable membrane devices as indicators of organic contaminant uptake in Dorchester and Duxbury bays, Massachusetts.
	www.mst.dk /udgiv/publikationer/2000/87-7944-147-5/html/kap11.htm (2407 words)

	Semipermeable Membrane (Site not responding. Last check: 2007-10-23)
		Semipermeable membrane: A thin partition between two solutions though which certain molecules can pass but others cannot.
		A cell, plasma, or cytoplasmic membrane is the semipermeable unit membrane surrounding, and defining the physical limits of a cell.
		Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
	www.semipermeablemembrane.info (255 words)

	Theses from Umeå University: 378 - Semipermeable membrane devices as integrative tools for monitoring nonpolar ...
		In the work underlying this thesis, the use of semipermeable membrane devices (SPMDs) as tools for monitoring gas phase concentrations of nonpolar aromatic compound was evaluated using the compound classes polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), alkylated PAHs (alkyl-PAHs) and nitrated PAHs (nitro-PAHs) as test compounds.
		Söderström, H.S. ; Bergqvist, P-A.: Polycyclic aromatic hydrocarbons in a semiaquatic plant and semipermeable membrane devices exposed to air in Thailand.
		Semipermeable membrane devices as integrative tools for monitoring nonpolar aromatic compounds in air.
	www.diva-portal.org /umu/theses/abstract.xsql?dbid=378 (1013 words)

	Osmosis (Site not responding. Last check: 2007-10-23)
		semipermeable membrane with approximately equal probability per whizzing molecule (even though solute molecules can't actually pass through the membrane).
		semipermeable membrane is a linear function of collision rates.
		semipermeable membrane if there is a deficit of water molecules participating in hydration shells on one side (see figure 6.12, page 117, Raven and Johnson, 1995).
	www.mansfield.ohio-state.edu /~sabedon/biol1053.htm (1315 words)

	Chemical osmosis: more theory
		Movement of water across a semipermeable membrane, in the absence of a hydraulic pressure difference e.g.
		Semipermeable properties of clays with essentially no charge, like kaolinite, arise predominantly from their size exclusion properties.
		If the semipermeable membrane is an ideal membrane the theoretical osmotic pressure will equal the induced hydraulic head, as shown in Figure 1.
	www.xs4all.nl /~keizee/research/theory.html (1613 words)

	Callose Deposition Is Responsible for Apoplastic Semipermeability of the Endosperm Envelope of Muskmelon Seeds -- Yim ...
		Semipermeable cell walls or apoplastic "membranes" have been hypothesized to be present in various plant tissues.
		In conclusion, we have demonstrated that the semipermeability of the muskmelon endosperm envelope is caused by a callose-containing
		Johann H (1942) Origin of the suberized semipermeable membrane in the caryopsis of maize.
	www.plantphysiol.org /cgi/content/full/118/1/83 (4388 words)

	HighBeam Encyclopedia - osmosis
		Osmosis will occur if a vessel is separated into two compartments by a semipermeable membrane, both compartments are filled to the same level with a solvent, and solute is added to one side.
		Two solutions separated by a semipermeable membrane are said to be isotonic if no osmosis occurs.
		Living cells of both plants and animals are enclosed by a semipermeable membrane called the cell membrane, which regulates the flow of liquids and of dissolved solids and gases into and out of the cell.
	www.encyclopedia.com /html/o1/osmosis.asp (755 words)

	semipermeablemembranes (Site not responding. Last check: 2007-10-23)
		Semipermeable membranes allow the passage of some particles and not others based on size of membrane and of particles.
		Dialysis tubing is semipermeable and will allow the passage of sugar but will not allow the passage of the starch solution.
		Students will be able to explain how a membrane can be semipermeable relating it to dialysis tubing and the sugar and starch solutions.
	www.msu.edu /~radema18/semipermeablemembranes.htm (268 words)

	Membranes (Site not responding. Last check: 2007-10-23)
		Lipid bilayers are referred to as semipermeable because, while some substances can readily pass from one side of a lipid bilayers to the other, others do so only with great difficulty, if at all.
		This is because semipermeable cell membranes tend to have either selective or non-selective protein holes in them (in gram-negative bacteria, for example, plasma membranes have selective holes while outer membranes tend to have non-selective holes).
		True or False, semipermeable lipid bilayers are permeable to water molecules as a consequence of the water molecule's hydrophilicity (circle correct answer).
	www.mansfield.ohio-state.edu /~sabedon/biol1050.htm (1908 words)

	4: Osmosis
		I semipermeable membrane, you may recall, is a membrane which allows some molecules to pass through it but does not allow other molecules to pass through it.
		What you may not realize is that many materials you think of as being "waterproof" are also semipermeable as your and your students will discover is this series of inquiry activities based on the EAGLES model (Germann, 1997).
		A semipermeable membrane allows some molecules to pass through it while not allowing other molecules to pass through it.
	www.coe.missouri.edu /~pgermann/EAGLES/Biology_EAGLES/The_Cell/Diffusion___Osmosis/Osmosis--Dr._G/Explorations/4__osmosis.html (2473 words)

	Re: semipermeable membrane
		semipermeable membrane - Roman, Mon, 13 Jan 2003, 6:37 a.m.
		Re: semipermeable membrane - Mads Bang, Mon, 13 Jan 2003, 7:27 a.m.
		Re: semipermeable membrane - Roman, Tue, 14 Jan 2003, 6:44 a.m.
	www.cfd-online.com /Forum/cfx_archive_2003.cgi?read=4255 (146 words)

	Howstuffworks "How does reverse osmosis work?"
		According to Merriam-Webster's Collegiate Dictionary, osmosis is the "movement of a solvent through a semipermeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane." That's a mouthful.
		A semipermeable membrane is a membrane that will pass some atoms or molecules but not others.
		The best common example of a semipermeable membrane would be the lining of your intestines, or a cell wall.
	www.howstuffworks.com /question29.htm (516 words)

	Patent 6,146,662
		The selectively semipermeable compositions used for forming the wall are non-erodible and they are insoluble in fluids.
		3,173,876; 3,276,586; 4,541,005; 3,541,006, and 3,546,142; semipermeable polymers as disclosed by Loeb and Sourirajan in U.S. Pat.
		Layer 21 in initial contacting relation with the internal surface of semipermeable wall 12 and in initial contacting relation with drug 16 composition and with push 18 composition, comprises a layer 21, 0.1 mm to 15 mm thick.
	www.pharmcast.com /Patents/November2000/111400OG/6146662_delayedRel111400.htm (3215 words)

	Osmotic energy
		A semipermeable membrane, which is an organic filter, separates the solutions.
		For pure fresh water and perfect semipermeable membranes a flushing pump would not be necessary and the electric power produced in the SHEOPP Converter would be maximised.
		Seawater is pumped from the surface to a barrier of semipermeable membranes (an osmotic unit).
	exergy.se /goran/cng/alten/proj/97/o (2207 words)

	Osmosis
		Osmosis is the flow of water through a semipermeable membrane separating two solutions of different concentrations.
		Some solutes can diffuse across a semipermeable membrane to make the fluid concentrations on both sides of the membrane equal.
		If a glass container is filled partly with pure water and it is separated into two compartments with a semipermeable membrane, water molecules will always cross the membrane in both directions.
	www.vet.ohio-state.edu /assets/courses/vm613/part4/part4.html (766 words)

	Ditropan Online, Description, Chemistry, Ingredients - Oxybutynin - RxList Monographs
		The bilayer core is composed of a drug layer containing the drug and excipients, and a push layer containing osmotically active components.
		There is a precision-laser drilled orifice in the semipermeable membrane on the drug-layer side of the tablet.
		The semipermeable membrane controls the rate at which water permeates into the tablet core, which in turn controls the rate of drug delivery.
	www.rxlist.com /cgi/generic/oxybut.htm (371 words)

	Geoffrey S. Ellis
		Ellis, G.S. In situ application of a semipermeable membrane device for the detection of organic contaminants in the Upper Mississippi River.
		Evaluation of lipid-containing semipermeable membrane devices (SPMDs) for monitoring organochlorine contaminants in the Upper Mississippi River.
		Field implementation of semipermeable membrane devices and organic contaminant data from semipermeable membrane devices and fish, Upper Mississippi River, July-August 1991.
	mgg.rsmas.miami.edu /students/gsepage.htm (524 words)

	US PATENT SUBCLASS 95 / 45-- .~ Selective diffusion of gases through substantially solid barrier (e.g., ...
		Electrodeless solid electrolyte membrane cells are operated by maintaining a pressure on the feed side such that a positive driving force for ion transport can be achieved in the absence of an externally applied voltage and power source.
		96.2, 257.2, and 321.6+ for apparatus having membranes or dialyzers for separating liquids, subclasses 500.21+ for semipermeable membranes used in the separation of liquids, and subclasses 634+ for processes of separating a liquid by selective diffusion of a component of a liquid through a membrane or septum.
		818+, for processes in which a liquid hydrocarbon is recovered from a liquid mixture containing the hydrocarbon by the use of selective diffusion through a semipermeable membrane.
	www.patentec.com /data/class/defs/95/45.html (473 words)

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