In the end, Roosevelt felt he owed it to the country to serve the best way he could, and the best thing for the country then was a vigorous, seasoned leader. The current European war and its implications of dark times ahead convinced many Americans that Roosevelt should stay on.
1 Visible blue light kills acne bacteria. 2  Three blue light treatments kill about 99.99% of acne bacteria that the light reaches, although some acne bacteria live deep in pores. 3  Red light therapy can help shrink the sebaceous glands that produce the oil that clogs pores.cne bacteria are killed by visible blue light, that is, light you can see, not UV light, of wavelengths between 407 and 420 nanometers. The bacteria have pigments in their protective cell membranes that resonate at those frequencies. These pigments break down the membrane, eventually killing the bacterium.
We asked a dermatologist, Dr. Heidi Waldorf, a cosmetic dermatologist in New York City and Nanuet, New York, for some perspective on light therapy products and whether or not they actually work. âThis product is a reasonable option for anyone who gets the occasional pimple but finds acne spot treatments containing salicylic acid, benzoyl peroxide or resorcinol too drying,â Waldorf said.