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Topic: Visking tubing

	Apparatus for demonstrating osmosis
		This apparatus for demonstrating osmosis through visking tubing (otherwise known as dialysis tubing) and is widely used in school.
		Visking tubing is a semipermeable membrane that allows small molecules like water to pass through but does not allow larger molecules like sugar.
		The visking bags can be left attached to the bungs but should be rinsed and stored in water or a mixture of water and ethanol to keep the bag soft.
	www.teachtime.com /en/wikipedia/a/ap/apparatus_for_demonstrating_osmosis.html (610 words)

	BBC - KS3 Bitesize - SOS Teacher Science biology Starch
		What is a visking tube and will iodine pass through the tube to identify starch within the tube.
		Visking tubing is a tube made of plastic which is semi-permeable.
		Starch can’t pass through Visking tubing or the gut because it is too big and not soluble (it doesn’t dissolve in water).
	www.bbc.co.uk /schools/ks3bitesize/sosteacher/science/45863.shtml (259 words)

	OSMOSIS
		If a concentrated solution of sugar (glucose) is put in Visking tubing with no leaks, then when the tubing is lowered into distilled water, after a time the water molecules will have diffused into the Visking tubing until the concentration is equal.
		The Visking tubing is a partially permeable membrane as only water molecules can pass through it.
		In our example of the Visking tubing, if we count the sugar molecules as the main component of the solution we can say that the water was the hypotonic solution as it contained the least sugar molecules and that the sugar solution was hypertonic because there were a greater number of sugar molecules.
	allfreeessays.com /student/Osmosis.html (887 words)

	[No title]
		Test tube The tubing was then three quarters filled with a 1% starch solution.
		Starch + The contents of the tubing were mixed by shaking and the tubing then water bat@ amalyse Placed in a test-tube of distilled water as shown in the diagram.
		Solution (I) Fehiing's test on the contents of the Viskin'g tubing; (ii) Fehiing's test on the contents of the test tube; (iii) A starch test on the contents of the Visking tubing; distilled water (iv) A starch test on the contents of the test tube.
	www.shopcreator.com /mall/leavingcertsolutions/biology/doc0009.doc (576 words)

	skoool.ie :: exam centre
		Visking tubing is an artificial semi permeable membrane.
		Result: the tubing fills and expands plus the volume of water outside the tubing decreases; glucose is present inside the tubing but not outside the tubing.
		Active transport is the energy demanding transfer of a substance across a cell membrane against its concentration gradient, i.e., from a region where the substance is in lower concentration to where it is in higher concentration.
	www.leavingcert.net /skoool/examcentre_sc.asp?id=1227 (895 words)

	Selective Permeability & Dialysis (Site not responding. Last check: 2007-10-14)
		Wash the filled visking tubing under water before immersion in the distilled water (to remove any starch and glucose on the outer surface).
		In the absence of saliva, the starch molecules are too large to pass through the visking tubing.
		The visking tubing represents the internal wall of the small intestine and the distilled water represents the blood.
	info.bmkc.edu.hk /Academic/Biology/S3B/b3n/b3n01FoodNutrition/b3n01eFdN441SelectivePermeability.htm (392 words)

	cellophane tubing (Site not responding. Last check: 2007-10-14)
		crossed the cellophane tubing and of metabolized by the dog's liver.
		This device consisted of a steel drum with cellophane tubing that a spun in was.
		The dialysis circuit consists of flat cellophane tubing coiled a around plastic cylinder, permitting contact of the blood with the metabolic fluid.
	www.diabetes-wellness-today.com /diabetes/cellophane-tubing.html (511 words)

	To investigate the effect of osmosis on a potato
		The volume of the substance inside the visking tubing, which is a semi-permeable membrane, began to rise because the water had spread into it through osmosis.
		When the concentration of the substance in the boiling tube is more than the concentration of the potato water will move out of the potato and into the tube through osmosis, making it flaccid.
		When the concentration of the substance in the boiling tube is less than that of the potato the water will move from the tube into the potato through osmosis, making it turgid.
	www.coursework.info /i/4538.html (354 words)

	Dialysis Tubing: Product Parameters (Site not responding. Last check: 2007-10-14)
		The dialysis tubings are semipermeable membranes made of regeneratedcellulose or cellulose ester having a gel-like structure.
		Tubing made of regenerated cellulose can be boiled or sterilized by autoclave.
		VISKING® Dialysis Tubing (MWCO 12000 - 14000; pore diameter ca.
	www.serva.de /products/knowledge/011002.shtml (396 words)

	Mediclips, Spectrapor closures, membrane closures
		Sealing the ends of the tubing to retain its contents is now very easy and secure using one of the range of membrane closures available from Medicell.
		The Mediclip is a single size plastic clip designed to meet the general needs of tubing users and is ideal for most situations where membranes up to 40mm flat width are being used (to Size 7).
		When a Weighted Closure is used in conjunction with a regular closure, a vertical position of the dialysis tubing is achieved, increasing the rate of dialysis.
	www.visking.com /Visk_Products_clips.htm (481 words)

	dialysis tubing (Site not responding. Last check: 2007-10-14)
		VISKING Dialysis Tubing regenerated cellulose, MWCO 12 000-14 000, pore diameter ca.
		VISKING dialysis tubing 5 6 mm, 44104.01, 8/32, m, 44104.02.
		Dialysis tubing is actually a semi-permeable when membrane used in water.
	www.diabetes-wellness-today.com /diabetes/dialysis-tubing.html (484 words)

	Find the effects of the concentration of a sugar in water on the weight on potato chips.
		Like the potato chips, visking tubing will lose more and more weight the higher the concentration of sugar is in the solution.
		It is believed that plant cells work so similarly to visking tubing as it works on the same principal of minute pores.
		Although an experiment using visking tubing would work well, we are going to use potato chips, as they are already a formed part of the potato, where osmosis would naturally occur.
	www.coursework.info /i/40953.html (495 words)

	B1 - Lesson 5 - Enzyme sensitivity to pH
		Each group to report results to the whole class and an overall table of results to be compiled.
		The results show that starch cannot pass through Visking tubing, that amylase digests starch into simple sugars that can pass through the Visking tubing and that boiling amylase prevents it from working.
		However, using the tubing allows students to appreciate the role of diffusion in the absorption of small molecules produced by digestion.
	www.chadevans.co.uk /asite/gcse/b01/lessonlpan/lp05.html (385 words)

	DNA extraction from agarose gels (basic method)
		Dialysis tubing (Sigma D9777) is purchased in rolls (dried), prepared by boiling and stored submerged in buffer at 4C.
		(4) Immerse the sealed tubing in an electrophoresis tank so that the DNA band is parallel to the electrodes and apply 5V/cm electric field.
		The buffer and DNA are retained in the larger tube.
	www.methodbook.net /dna/gelextrc.html (931 words)

	[No title]
		Tie a knot in the end of one piece of tubing and then use a teat pipette to half fill it with dilute iodine solution.
		Place it in one boiling tube with the end of the tubing over the top and fix it firmly in place with an elastic band.
		Into tube C put 20 cm3 of water (make sure that the syringe is clean!).
	www.spolem.co.uk /worksheets/docs/diffusion.doc (620 words)

	[No title]
		Mathialahan Brief description of procedure: 8 to 10cm lengths of Visking tubing are cut, one end is tied with cotton or silk and sealed with Araldite glue.
		Leave over night to dry, turn inside out and fill with water to make sure water tight; leave to dry and then insert 2 tubes so that their ends are close to the sealed end.
		Tie off the other end of the Visking tubing and seal with Araldite.
	www.leeds.ac.uk /medicine/res_school/mol_med/downloads/coshh_assessments/BALLOON.DOC (300 words)

	Influence of Adsorption and Deproteination on Potential Free Thyroxine Reference Methods -- Holm et al. 48 (1): 108 -- ...
		for measurement of the adsorption to the dialysis tubing.
		± 8% (n = 14) for the dialysis tubing.
		For the Visking dialysis tubing, the albumin concentration in
	www.clinchem.org /cgi/content/full/48/1/108 (3006 words)

	The Effect of Different Concentrations of Sucrose On Visking Tubing
		The Effect of Different Concentrations of Sucrose On Visking Tubing
		Below is a short sample of the essay "The Effect of Different Concentrations of Sucrose On Visking Tubing".
		If you sign up you could be reading the rest of this essay in under two minutes.
	www.coursework.info /i/7612.html (224 words)

	Investigation to determine the molarity of potato tissue.
		The 2 molar sucrose solution visking tube increased greatly in mass after 30 minutes.
		All three visking tubes increased in mass because in side the tubes the sucrose solutions are a greater concentration then the water in each tube.
		The potatoes were left for 30 minutes in the tubes then they were dried with paper towels and reweighed to see if any changes had occurred.
	www.coursework.info /i/39510.html (400 words)

	Everything you always wanted to know about Apparatus for demonstrating osmosis
		Apparatus * 0.5m length of capillary tube * 10cm of medium width visking tubing * Bung with hole.
		Method of Use A) Clamp the apparatus in a retort stand, then place into a large beaker of 0.5M sucrose (isotonic).
		Storage of the Apparatus The apparatus cannot be stored for more than a few days with the sugar solution inside, because it will go mouldy.
	www.relan.net /How-to/Apparatus_for_demon.html (715 words)

	We are doing an investigation on the effect of different temperatures on enzymes.
		Place the tubing in a beaker of water.
		After this time test the water out side the tubing for starch and sugar.
		I predict that there will be sugar in the water because it has gone through the visking tubing just like it does in the intestine.
	www.studentcentral.co.uk /we_are_doing_an_investigation_on_effect_different_3693 (252 words)

	photographs
		We repeated for Experiment B, putting pure water inside the tubing and immersing in 300mls sucrose; Control C has pure water inside and outside the tubing
		Tube A had increased in length from 14cm to 20cm and had become very turgid, while the water level in the cylinder dropped from 300mls to 270mls
		Tube B had decreased in length from 14cm to 8cm and become very flaccid, while the water level in the cylinder has risen to 320mls
	www.teachnet.ie /mamond/P07Bphoto.htm (334 words)

	Visking Tubing Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-14)
		Looking For visking tubing - Find visking tubing and more at Lycos Search.
		Find visking tubing - Your relevant result is a click away!
		Look for visking tubing - Find visking tubing at one of the best sites the Internet has to offer!
	www.karr.net /encyclopedia/Visking_tubing (214 words)

	Rubber Tubing on Almondnet (Site not responding. Last check: 2007-10-14)
		Aero is an ISO 9001:2000 certified company providing rubber tubing to the specifications you provide.
		Tubing can be fabricated from virtually any elastomer you specify.
		Miller fabricates corrugated plastic and rubber tubing for a wide variety of...
	www.packaging-wholesalers.co.uk /packaging/rubber_tubing.html (400 words)

	Experiment to Illustrate the Movement of Food Molecules in the Digestive System (Site not responding. Last check: 2007-10-14)
		Tie a knot in one end of the visking tubing, by wetting it, spinning it then tying it.
		Wait for 30mins (minimum) for the molecules to diffuse through the pores in the visking tubing, if they can.
		Remove the visking tubing from the water and empty it's contents into another clean beaker.
	194.3.120.243 /science/study_pages/ib/biology/bioSL_main_topics/health_physiology/food_mol_experiment.htm (212 words)

	SERDOLIT ® Ion Exchange Resins - Overview (Site not responding. Last check: 2007-10-14)
		Diluted protein solutions should never come into direct contact with ion exchangers in the free base or hydrogen form.There will always be unspecific adsorption, precipitation or even denaturation.
		Dialysis against a mixed bed resin is the method of choice: the protein solution is filled into a dialysis tubing (e.g.
		Visking, cat.no. 44104) and suspended in a 10 % suspension of mixed bed ion exchanger with exhaustion indicator (e.g.
	www.serva.de /products/knowledge/071110.shtml (1018 words)

	Diffusion - Osmosis demos
		The movement of water molecules can also set up a pressure, called osmotic pressure, which depends on the difference between the concentrations on either side of the membrane.
		"Visking" tubing is a form of processed cellulose or cellophane which has pores in it through which water (and other small molecules) can pass, so it can be considered as a PARTIALLY PERMEABLE MEMBRANE.
		If it is sealed at one end, attached to a glass tube, and filled with a liquid such as sugar solution, and immersed in another liquid such as water, then water should pass through the visking tubing and cause the level of liquid to rise inside the glass tube.
	www.biotopics.co.uk /life/osmsis.html (860 words)

	aande.ca - tubing (Site not responding. Last check: 2007-10-14)
		Distributor of metal fabricating equipment, including sheet metal equipment, tubing benders, and fabrication machinery to Canda, Mexico, and the United States.
		He went back a day later and the same roll of protective tubing was selling for $48.90.
		The FDA has approved the first in a new class of drugs that reduces the side effects and boosts the effectiveness of traditional breast...
	aande.ca /tubing/reference/search (436 words)

	Untitled Document (Site not responding. Last check: 2007-10-14)
		First person next lesson to tell me the name of the organ that is still present in humans that used to be used for digesting grass gets a credit.
		We placed starch and carbohydrase in the visking tubing.
		There was sugar in the inside, but we were surprised that there wasn't any on the outside because we expected the small molecules to move through the holes.
	www.dr-sanderson.org /8S3.htm (109 words)

	[No title]
		Apparatus: two pencils or a piece of wire worksheet B12.2 B13 Practical 1 Pin-hole cameras Note: Teachers should consider whether the use of needles by students is suitable.
		Apparatus: 2-3 test tubes test tube rack glucose (dextrose) spatula 2-3 glucose dip strips (Clinistix) yellow felt tip pen or glucose-free yellow food colouring B18 Practical 1 Smoking Note: This experiment must be done in a fume cupboard.
		Apparatus: conical flask with two-holed bung glass U-tube half full of glass wool 2 single holed bungs for U-tube strong cigarette limewater delivery tubes to connect apparatus suction pump B19 Practical 1 Stimulants Note: This practical should not be done in a laboratory.
	www.longman.co.uk /foundationscience/docs/technician/foundation_b.doc (585 words)

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