Magnetic Stirring
Magnetic Stirring - Related Videos
10:20
Mammalian Cell Encapsulation in Alginate Beads Using a Simple Stirred Vessel
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Cited by 13 •
2017
This video and manuscript describe an emulsion-based method to encapsulate mammalian cells in 0.5% to 10% alginate beads which can be produced in large batches using a simple stirred vessel. The encapsulated cells can be cultured in vitro or transplanted for cellular therapy applications.
10:49
Power Input Measurements in Stirred Bioreactors at Laboratory Scale
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Cited by 9 •
2018
The power input in stirred bioreactors can be measured through the torque that acts on the impeller shaft during rotation. This manuscript describes how an air bearing can be used to effectively reduce friction losses observed in mechanical seals and improve the accuracy of power input measurements in small-scale vessels.
08:39
Magnetic and Thermal-sensitive Poly(N-isopropylacrylamide)-based Microgels for Magnetically Triggered Controlled Release
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Cited by 9 •
2017
This manuscript describes the preparation of magnetic and thermal-sensitive microgels via a temperature-induced emulsion without chemical reaction. These sensitive microgels were synthesized by mixing poly(N-isopropylacrylamide) (PNIPAAm), polyethylenimine (PEI) and Fe3O4-NH2 nanoparticles for the potential use in magnetically and thermally triggered drug-release.
11:31
Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
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Cited by 34 •
2012
Laboratory-scale anaerobic digesters allow scientists to research new ways of optimizing existing applications of anaerobic biotechnology and to evaluate the methane producing potential of various organic wastes. This article introduces a generalized model for the construction, inoculation, operation, and monitoring of a laboratory-scale continuously stirred anaerobic digester.
10:04
Magnetic Fields
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Magnetic fields can be generated by moving charges, such as an electrical current. The magnetic field generated by a current can be calculated from the Maxwell equation. In addition, magnetic objects such as bar magnets can also generate magnetic fields due to microscopic dynamics of charges inside the material. Magnetic fields will exert magnetic force on other moving...
FAQs
Stir-bar size and stirring speed provide two practical ways to control mixing intensity. Increasing either variable can promote stronger fluid circulation, while lower settings produce gentler movement. The appropriate combination depends on the liquid and vessel being prepared. Consistent adjustment helps reduce concentration differences and supports repeatable preparation of buffers, media, and reagents.
The rotating magnetic field transfers motion from the external motor to the stir bar inside the vessel. As the bar rotates, it drives circulation through the liquid rather than mixing only the region near the vessel bottom. This circulation helps distribute dissolved components and heat more evenly, which is important when experimental results depend on consistent sample conditions.
Uniformly mixed solutions reduce concentration gradients before biological analysis begins. In immunology and infection research, that consistency can help ensure that samples receive comparable buffer, culture medium, or reagent conditions. Better-controlled preparation supports more reproducible assays and makes differences between experimental results easier to interpret as biological or experimental effects rather than uneven mixing.
Place the liquid in a suitable vessel and add a magnetized stir bar. Position the vessel over the external motor, initiate rotation, and select a stirring speed appropriate for the desired mixing intensity. Adjust the bar size or speed when necessary, then continue until the liquid has circulated uniformly. This workflow applies to buffers, culture media, and reagents.
Magnetic stirring is useful when a microbial suspension must remain consistently mixed during preparation or handling. Circulation helps distribute suspended material through the liquid and limits uneven concentrations within the vessel. In infection research, this can support more consistent sample preparation before biological analysis, particularly when comparable suspension conditions are needed across assays.
Consistent stirring helps control the composition and temperature of laboratory liquids before they are used in an experiment. Researchers can also document the selected bar size and stirring speed as part of sample preparation conditions. Maintaining these settings across preparations reduces avoidable variation and strengthens comparisons among immunology or infection experiments that use shared reagents or media.