You can run, but you can't hide when it comes to bacteria. They can be found everywhere on earth, from Antarctica to the inside of your intestines! Some are good, aiding digestion and giving us tasty food like cheeses and yogurt. Many are harmful, causing serious diseases; these are called pathogenic bacteria.hey are often able to cure once-fatal diseases, such as the bacterial infection scarlet fever. Amoxicillin, penicillin, and erythromycin are common antibiotics that inhibit bacterial cell functions. Antibiotics are derived primarily from bacteria or fungi (mold), such as Penicillium.
Full Definition of OPTICS. : a science that deals with the genesis and propagation of light, the changes that it undergoes and produces, and other phenomena closely associated with it.ADVERTISEMENT.. : a science that deals with the genesis and propagation of light, the changes that it undergoes and produces, and other phenomena closely associated with it.
Optics. 1  the variation of the index of refraction of a transparent substance, as glass, with the wavelength of light, with the index of refraction increasing as the wavelength decreases. 2  the separation of white or compound light into its respective colors, as in the formation of a spectrum by a prism.