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In an incandescent light bulb (the kind that screws into a standard light socket), the filament is the piece of metal in about the middle of the glass bulb that glows and emits light and heat when electricity passes through it. It is usually made of tungsten, but originally was made of carbon.

New compact fluorescent and LED-based light bulbs do not really have filaments like incandescent light bulbs.

Filament is a term also used in astronomy and Biology for different things, but these uses are not as common as in light bulbs.

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These pathogens absorb nutrients through filaments?

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