BIOL 319 Lecture Notes - Lecture 3: Peptidoglycan, Coccobacillus, Retina
3 Feb 2017
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Resolution: smallest distance two objects can be separated and distinguished. Microscopes magnify image: human retina is ~150 micrometers. Some bacteria are pleomorphic, meaning they can change shape. Indicidual bacteria can interact in clumps, chains, and other arrangements. Rods: diplobacillus (chains of two); streptobacillus (chains of several) Some antibiotics will stop bacterial cells from bonding or will break them apart. Types of microscopy: light microscopy: will probably need to use a stain, phase-contrast, fluoresence microscopy: excite fluoroforms to illuminate specific parts of specimine, electron microscopy. Wavelength is related to resolution, which is the ability to see two objects as discrete objects. White light has a mixture of wavelengths and can"t resolve structures less. Need a high resolution to see two objects, regardless of magnification. This is because light has to be able to pass through two objects to see the specimen than . 2micrometers. High wavelength (such as red light) has lower resolution than a low wavelength (such as blue light)
