ENH 222 Lecture Notes - Lecture 1: Robert Hooke, Protozoa, Peptidoglycan

• School: Ryerson University
• Department: Environmental Health
• Course: ENH 222
• Professor: Jordan Tustin

Document Summary

Early studies showed microbes exist, but did not reveal it was associated with diseases or food/beverages. Microorganisms are organisms that are too small to be seen with unaided eye. Microbes include: bacteria, fungi, protozoa, viruses, and microscopic algae. Decompose organic waste and generate o2 by photosynthesis. Produce chemicals such as ethanol, acetone, and vitamins. Produce fermented foods such as vinegar, cheese, bread. 1673: van leeuwenhoek rst observation of live microorganisms. 1857: pasteur fermentation, disproved spontaneous generation (1861), pasteurization (1864) Robert hooke reported that living things are composed to little boxes or cells . Marked the beginning to cell theory: all living things are composed to cells. Eukarya (group of closely related organisms that breed among themselves) eg. yeast. Derive nutrition from organic or inorganic chemicals or photosynthesis. Incl: methanogens (prod methane, reduces co2 to methane, extreme halophiles (can survive saline conditions), extreme thermophilles (prod bright colors as seen at.