Magnetic Sensors

Magnetic biosensors detect hybridization using a signal probe labeled with a metal microbead. Miller and colleagues showed that the material used in hard-drive read heads, giant magnetoresistance (GMR) sensors, could be modified with DNA probes to detect target DNA.[21] Using commercially available chips, they showed eight DNA samples from pathogenic bacteria could be read within 30 min. Similar work compared probe concentrations and magnetic microbeads, and showed detection of 100 nmol (10 ng/p.L) target DNA.[22] This technique has been studied by only a few groups, but shows promise because the GMR microchips and readers are already developed, and because each GMR sensor is capable of detecting a single magnetic bead, so that a single target molecule may be detectable.

Getting Started With Dumbbells

Getting Started With Dumbbells

The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.

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