Tuesday Tech News

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Many industry veterans argue that open source is accelerating a shift that has been going on in the software industry for some time: Rather than hinge their business on big-ticket license contracts, software providers increasingly rely on recurring maintenance revenue. And because most open-source tools don't have license fees attached to them, commercial open-source companies are often forced to build their businesses around services revenue, in the form of support, up-front installation or training.

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"We need a free BIOS, because if we don't control the BIOS we don't control our computers," said Richard Stallman, president of the Free Software Foundation, a Boston-based organization dedicated to promoting the use, modification and redistribution of computer programs. "It puts me in an ethically compromised position to have a non-free program in my machine."

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In the experiments, blue light from a halogen lamp was shone onto pure cultures of BPB and onto plaque samples obtained from patients with chronic gum disease. Bacteria in the pure culture were killed in seconds, whereas bacteria in the plaque samples were killed selectively. Those containing iron-porphyrins were most affected - a beneficial result as it is iron-porphyrins that help bacteria in harming the gums. It is the acidic environment produced by the harmful bugs that results in tooth decay.