BIOL 2051 : Microbiology Test 1 Notes
Document Summary
Microbes have been on earth for 4 billion years mold. 1665 robert hook was the first to discover microorganisms fruiting bodies of. 1676 antoni von leeuwenhoek was the first to describe bacteria visible age of microbiology. Microscopy allows cell shape and arrangement to be seen as well as structures within the cell: allows pathogens to be seen among animal cells such as mycobacterium tuberculosis, allows us to determine gram-positive and gram-negative organisms. Compound light microscopes: 1000x magnification, 0. 2 micrometers limit of resolution. 4 types of light microscopy: brightfield: simplest, light source and lenses, specimen stained, magnified. Size affects the physiology, growth rate, and ecology. High surface area to volume ratio aids in nutrient absorption and waste exchange with the environment smaller cells generally have a better ratio. 10^11 microbial cells/gram of contents in our large intestines. Microbes assist in the manufacturing of and the spoiling of many different food products: dairy products, breads and grains, alcoholic beverages.
