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magnetic stirrer

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	Floating magnetic stirrer for culture medium - Patent 4498785
		A stirrer for stirring liquid in a flask comprises a magnetically attractable member formed by or supported by a buoyancy chamber, the stirrer having less density than the liquid to be stirred; the stirrer may include an impeller.
		In addition, the stirrer may be a cylindrical magnet, hollow and with end closures to provide buoyancy, all of the stirrers being of lesser density than the liquid, preferably having a density of approximately one-half of that of the liquid.
		The herein disclosed buoyant magnetic stirrer may be utilized with a conventional flask, or with a Pearson flask, characterized by a conical projection at the bottom, forming an annular trough or channel in the bottom of the flask.
	www.freepatentsonline.com /4498785.html (4643 words)

	Magnetic stirrer - Wikipedia, the free encyclopedia
		A magnetic stirrer consists of a small bar magnet (or stir bar), which is normally wrapped in plastics like PTFE and a stand or plate containing a rotating magnet or stationary electomagnets creating a rotating magnetic field.
		During operation of a typical magnetic stirrer, the bar magnet (flea) is placed in a vessel containing a liquid to be stirred.
		Magnetic stirrers are preferred over gear-driven motorized stirrers in chemical research because they are quieter, more efficient, and have no moving parts to break or wear out (other than the simple bar magnet itself).
	en.wikipedia.org /wiki/Magnetic_stirrer (523 words)

	Magnetic stirrer apparatus with improved stirring action - Patent 4759635
		The stirrer included one or more continuous impellers extending across the rotational axis of the stirrer; in one embodiment, the impeller is provided by a bar magnet or magnets beneath a float and in another embodiment a bar magnet is within the float, and the impeller is a continuous blade.
		The floating stirrer in some embodiments comprises a magnetic element, and on the exterior of the flask there is provided means for generating a rotating magnetic field to cause rotation of the magnetic element and the buoyant stirrer of which it forms a part.
		The buoyant stirrer 52 is caused to rotate the magnet-impellers 26 causing the above-noted outward flow of fluid to the walls of the flask 12 from closely adjacent the axis of rotation.
	www.freepatentsonline.com /4759635.html (3397 words)

	Parr Magnetic Stirrer Drives (Site not responding. Last check: 2007-10-09)
		All Parr stirred reactors are equipped with a magnetic drive to provide a trouble-free linkage to an internal stirrer, thereby avoiding the leakage problems which sometimes arise with a packed gland stirrer drive in severe service.
		Magnets for the inner rotor to which the stirrer shaft is attached are enclosed in a stainless steel (or other alloy) housing, permanently sealed by laser welding and supported by graphite-filled, PTFE bushings to provide a long life, chemically inert stirring system.
		Magnets for the outer drive are also fully enclosed and supported by twin, high quality sealed ball bearings for smooth operation and long life.
	www.parrinst.com /default.cfm?page_id=246 (736 words)

	Magnetic stirrer, Velp
		VELP Scientifica magnetic stirrers are laboratory solutions used for diversified application, for sample volume from 250 ml to 25 liters.
		The MST magnetic stirrer, with ABS structure, is small, simple and effective stirrer.
		The MICROSTIRRER magnetic stirrer, with epoxy painted metal structure, ensures a high resistance to chemical agents.
	www.velp.it /magnetic_stirrer.htm (184 words)

	Taylor Scientific supplier of Laboratory Chemicals, ph meters, test tubes, flasks, and more (Site not responding. Last check: 2007-10-09)
		This versatile multiple stirrer, with exclusive solid state speed control, is designed for synchronous stirring of up to six separate vessels at speeds from 60 to 2250 rpm.
		These magnetic stirrers with durable, corrosion resistant glass-ceramic Pyroceram® top are ideal for a wide range of stirring applications.
		The Biostir® heavy duty magnetic stirrer is designed for use with Wheaton Celstir® suspension culture flasks (12-5772).
	www.taylorscientific.com /store/listcategoriesandproducts.asp?idProductSection=559 (1379 words)

	Using a Magnetic Stirrer
		A magnetic stirrer is used to provide continuous, uniform stirring during a titration.
		A magnetic stirrer allows for continuous, uniform stirring, and provides you with one free hand during a titration.
		Turn on the magnetic stirrer and adjust its rate for gentle stirring to keep the solution from splashing up on the sides of the flask.
	jchemed.chem.wisc.edu:8000 /jcesoft/cca/CCA6/MAIN/1ChemLabMenu/Measuring/Titration/titr_menu/USESTIR/THUMBS.HTM (125 words)

	Magnetic stirrer construction, from HBD #2570, Nov 29, 1997 (Site not responding. Last check: 2007-10-09)
		Magnetic stirrer construction, from HBD #2570, Nov 29, 1997
		The height of the magnet in relation to the jug I use is adjusted by using various length spacers.
		There are also more that 101 ways to attach the magnet to the motor.
	www.home.earthlink.net /~jsbrewing/stirrer/stirrer.htm (1849 words)

	Stirrers - Used Surplus Equipment
		This is a used small magnetic stirrer made by IKA, the top is made of glass and the bottom is made of Hytrel, speed is 0-1500 rpm.
		Stirrer 000530, beautiful mint condition Stirrers only stystems with 7" x 7" tops for this Magnetic Stirrer, speed range rom 100-1000 rpm, recently inspected to work to specification, white c...
		Stirrer 000520, beautiful mint condition Stirrers only stystems with 7" x 7" tops for this Magnetic Stirrer, speed range from 100-1000 rpm, recently inspected to work to specification, white...
	www.labx.com /v2/newad.cfm?catID=108 (697 words)

	VARIOMAG - Directly Controlled Magnetic Stirrers
		Inexpensive, super-flat magnetic stirrers for direct use at the workplace and in incubators.
		Can be supplied either as magnetic stirrer with a single stirring point or as a multiple magnetic stirrer for small to medium stirring volumes.
		The stirrers have a motorless drive, which is fitted into a fully sealed plastic housing, together with the control system.
	www.variomag.com /mono.html (278 words)

	VARIOMAG - Heatable Magnetic Stirrer - MONOTHERM
		The heatable magnetic stirrer, designed along the lines of the tried and tested VARIOMAG principle, allows defined stirring, energy saving heating to +300 degrees C, and accurate temperature conditioning in a single operation.
		This heatable magnetic stirrer, at a height of only 60 mm, is of a truly superflat design.
		The operation field of all stirrers using a stirring rod is enhanced dramatically.
	www.variomag.com /monotherm.html (337 words)

	SPI Supplies® Brand PTFE Encapsulated Magnetic Stirrer
		The magnetic stirrer is available in both a standard and also a "bio" version for use with fragile tissue samples.
		Brand PTFE Encapsulated Magnetic Stirrer is molded from pure virgin PTFE resulting in a highly inert material, one that will stand up to nearly every way one might want to use it.
		PTFE encapsulated magnetic stirrers can not be taken to temperatures as one might with normal "uncoated" magnetic stirrers and the user has to make sure that they are not.
	www.2spi.com /catalog/plasticware/PTFE-encapsulated-magnetic-stirrer.shtml (261 words)

	LabScientific, Inc.
		A simple and effective small stirrer, purposely studied for hanging microtitration stirring, particulary useful where a reliable apparatus of limited height is required.
		Magnetic stirrer without heating, with electronic speed regulation up to 1200 rpm by means of a continuos regulator, screened against radiofrequencies.
		Magnetic stirrer with light, single place (AMI) or 4 places separately controlled (AMI 4).
	www.labscientific.com /LabEquipment_Stirrer.asp (405 words)

	LABORATORY & SCIENTIFIC EQUIPMENTS( Magnetic Stirrers )
		Safety magnetic stirrer with heating and bushing in accordance with DIN 12878 for connecting an electronic contact thermometer, e.g.
		Magnetic stirrer with heating and bushing in accordance with DIN 12878 for connecting an electronic contact thermometer, e.g.
		Often, in the lab, a sample is removed from the stirrer before reducing the speed.
	www.somatco.com /stirrer.htm (583 words)

	Lindsay Brown wp
		The same magnetic stirrer was used to create a rotating magnetic polarity for all trials in both phases.
		The responding variable for Phase 1 was whether or not the magnetic field with the oscillating polarity from the magnetic stirrer caused degradation in Oncorhynchus sp.
		After being placed on the magnetic stirrer for twenty-seven and a half hours, the average percentage of DNA remaining in the solutions was 47.2%.
	share3.esd105.wednet.edu /mcmillend/00/lindsayb/lindsayb.html (4841 words)

	Magnetic Stirrers, Mixers, Agitators, Magnetic Drives and Stirrers
		Drawing on proprietary technology, PDC utilizes a magnetic coupling between an outer magnet assembly - driven by a motor - and an inner magnet assembly, separated by the PUMA Drive tube.
		When the outer magnet assembly rotates the torque is magnetically transferred through the stationary drive tube to the inner magnets attached to the drive shaft.
		In contrast it is cumbersome and time consuming to perform the same service on a direct drive magnetic agitator.
	www.pdcmachines.com /magnetic_stirrers.asp (301 words)

	Magnetic Stirrer
		A magnetic stirrer is used to mix liquids.
		A magnetic stirrer is used to provide continuous, uniform stirring during a titration.
		If the stirrer is already on when the sample and stir bar is place on it, jumping and splashing result.
	jchemed.chem.wisc.edu /jcesoft/CCA/CCA6/MAIN/1ChemLabMenu/Manipulating/mix_menu/magstirrer/MENU.HTM (100 words)

	OZ REEF - Magnetic Stirrer, Modifications
		The reason that it does not work is the stirrer is designed for small vessels, and a kalk reactor is not that small (anywhere from 1 to 4 gallons).
		The first magnet I purchased pushed the stir bar away at one end while it attacted it to the other.
		Further details of this magnetic stirrer can be found on the Calcium Hydroxide Reactor project page.
	ozreef.org /diy_plans/electronic_projects/magnetic_stirrer.html (663 words)

	Model 300 Magnetic Stirrer
		The Model 300 Magnetic Stirrer is a motorless magnetic stirrer that operates by generating a rotating electromagnetic field in the stirring heads.
		The bar and therefore the liquid, is rotated by the magnetic field produced in the heads.
		The stirrer body is 38mm diameter stainless steel tube with an acrylic base 89mm diameter.
	www.rankbrothers.co.uk /prod3.htm (599 words)

	Conductivity, altered by a magnetic field???
		Anyway, i had a magnetic stirrer stirring the solution in a beaker when the conductivity probe from a EDT Series 3 RE387Tx Conductivity meter was inserted to take a reading.
		The rotating magnet also creates a AC field, it is not clear how the conductivity meter would separate contributions due to the field it generates vs that created by the rotating magnet.
		Since the magnetic stirrer is rotating, it would create an ac potential in the solution, but I would think that the frequency of rotation of the stirrer would have to be synchronized with the conductivity tester in order to produce a steady reading.
	www.physicsforums.com /showthread.php?threadid=4530 (397 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		Using a magnetic stirrer and stirring bar, the chemicals will create a tornado like reaction in the flask.
		The magnetic stirrer works because a motor on the inside is turning an electromagnet.
		The force is strong enough to spin the magnet on the inside of the glass flask.
	www.elmhurst.edu /~chm/demos/tornadoreaction2.htm (403 words)

	Millipore Catalogue - Milli-Stir Magnetic Stirrer
		The Milli-Stir is a slim, compact stirrer that mixes up to 800 mL of low viscosity fluid media at speeds from 15 to 1500 rpm with stir bars up to 25 mm long.
		The advanced magnetic coil technology has no moving parts, which eliminates wear.
		The stirrer automatically reverses direction every 30 seconds to ensure better mixing.
	www.millipore.com /catalogue.nsf/docs/C9246 (81 words)

	Cabinet #3 (Site not responding. Last check: 2007-10-09)
		A magnetic stirrer is a devise that allows the chemist to stir solutions without being in direct contact with the solution container.
		The magnetic stirrer works by turning a magnet under the top of the stirrer, a plastic coated bar magnet is added to the solution to be mixed and the solution is put on top of the stirrer.
		When the mixing is done, a magnet retriever (covered magnet on a rod) is used to remove the magnet from the solution.
	www.bsu.edu /web/dasmith2/SaltSandIron/Cabinet3.html (189 words)

	VWR LabShop: industrial and laboratory stirrers (Site not responding. Last check: 2007-10-09)
		This compact stirrer is designed to operate continuously for hours with little speed deviation.
		These stirrer motors are suitable for volumes of up to 40L of medium- to high-viscosity liquids.
		This medium-duty stirrer motor is designed for stirring up to 10L of liquid with the viscosity of up to 10,000cps.
	vwrlabshop.com /category.asp_Q_c_E_1625 (253 words)

	Brews & Views Bulletin Board Service: Magnetic Stirrer?
		I use a stirrer, and I think it eliminates the need to oxygenate the starter (why oxygenate if you're continuously adding air to the starter).
		I use a magnet on the OUTSIDE of the flask to keep the stir bar in the flask when I pitch my yeast.
		If you forget and dump the magnet into the fermenter, it'll be OK, unless you have a conical with a bottom drain.
	hbd.org /discus/messages/20001/21730.html?1083098677 (1028 words)

	Magnetic Stirrer (Site not responding. Last check: 2007-10-09)
		Compact stirring device utilizing a rotating magnetic field applied from below the container.
		The stirring is accomplished by a taflon rotor placed in the liquid to be stirred.
		c) Magnetic stirrer with hot plate and energy regulator 1 lt., 2 lt., 5 lt., 10 lt., complete with taflon coated magnet.
	www.veetron.com /magnetic_stirrer.asp (187 words)

	Stirrers, Magnetic Stirrer, Hot Plate Stirrer, Laboratory Stirrer, Hot Magnetic Plate Stirrer, Glass Stirrer, Hotplate ...
		The stirrers offered here represent the finest products of their kind in the industry, today.
		Likewise the shafted stirrers with propeller are available to fit the most demanding applications including very viscous liquid stirring.
		The open-tank, continuous-duty stirrer readily mixes low-viscosity or water-like...
	www.labdepotinc.com /category_details~id~101.aspx (404 words)

	Automated Aquarium Systems - Hanna Instruments HI180 Mini Magnetic Stirrer
		The new Hanna HI180 series stirrers are compact, lightweight, low-cost and designed in a special round shape without any sharp corners.
		These stirrers incorporate electronic controls that allow the user to regulate the speed with greater precision.
		Ready to Run Each stirrer is supplied complete with a 25mm (1") long (7mm/0.3" as diameter) Teflon® coated magnetic stir bar and instruction manual.
	www.automatedaquariums.com /h_180.htm (312 words)

	TWC BioSearch International Magnetic Stirrers
		TWC BioSearch/Bellco Magnetic Stirrers are specificallydesigned for growing both mammalian and bacterial cultures where minimalheat transfer from the magnetic stirrer to the culture vessel is essential.They are ideal for tissue cultures grown in spinner flasks.
		Employ Bellco Magnetic Stirrers on the bench, in a coldroom or incubator.
		A system consists of a Master Controller (which houses the electroniccomponents), up to four Magnetic Stirrer Modules and connecting cables.Place Magnetic Stirrer Modules in an humidified CO atmosphereand operate them with the Master Controller located outside of the conditions.
	www.twcbiosearch.com /bellco/sect15.htm (751 words)

	Auto-Reverse Magnetic Stirrers
		HI 312N is a powerful stirrer that stirs up to 5.0 liters (1.3 gallons).
		During repeated testing, samples are often removed from the stirrer before the speed is reduced.
		Hanna stirrers incorporate a VCO device that stops the motor from accelerating as soon as the load is removed (Speedsafe).
	www.harvardapparatus.com /webapp/wcs/stores/servlet/product_10051_10001_38818_-1_HAI_ProductDetail_30710____ (414 words)

	[No title]
		To prevent the stirrer from generating heat that will change the temperature of the solutions, it is recommended that a piece of cardboard or foam be placed between the magnetic plate and the beaker.
		It should range from five to twenty degrees in magnitude and should evenly bracket the temperature that you expect your solutions to be.
		Calibrating the pH Meter (Two-buffer Calibration) Materials: - Pair of standard buffer solutions (either pH 4.01 and 7 or 7 and 10.00) Tools: Equipment: - Magnetic stirrer, - Stir bar - Thermo Orion PerPhect pH meter Purpose: A two-buffer calibration performed daily ensures that pH is measured accurately in the range between the two buffers.
	www.utdallas.edu /~tres/protocols/neurochem.pH.patrick.doc (955 words)

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