BIOL 1011 Chapter : Chapter 1 Notes Fall 2013
Document Summary
Microbes (that is, organisms that are too small to be seen with the unaided eye) Microorganisms are both favorable and unfavorable to man. Favorable microbes intestines- digestion synthesis of some vitamins ( b vitamins and vitamin k) protection form disease-producing (pathogenic) microorganisms agriculture- alcohol, bread, dairy products disintegration of plant/animal remains- recycle. Tiny but important percentage of all microorganisms, ecological relationship. 1346- 51 black death spread throughout europe (bubonic plague - yersinia pestis). 25 million people die in a few short year (estimated total population of 100 million) Plague is also known as the black death the characteristic blacking areas on the skin caused by hemorrhages. The name bubonic plague comes from the buboes, that form in the lymph nodes in the groin and armpit regions. Reservoir: infected rodents population and infected rat fleas (zoonosis). In western united states the disease is endemic in wild rodents. Transmission: rat flea bite, or rat"s flea feces scratched into bite.
