Silicon is the workhorse among semiconductors in electronics. But in opto-electronics, where light signals are processed along with electronic signals, a semiconductor that is capable of emitting light is needed, which silicon can't do very well. Here gallium-arsenide (GaAs) is the workhorse, especially in the creation of light emitting diodes (LED) and LED lasers.
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New antibacterial strategies are needed because more and more bacteria are antibiotic resistant and because antibiotics are not effective at eradicating chronic bacterial infections. One approach to developing new antibacterial strategies, taken by researchers from the University of Washington, Seattle, is to limit the amount of iron (Fe), which is critical for bacterial growth, to which bacteria have access.
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