Classification of Microorganisms
1978: Two types of prokaryotic cells found Prokaryotic relationships determined by rRNA sequencing All Species Inventory (2001–2025)
Classification of Microorganisms
• Not available for most microbes with following exceptions – White Cliffs of Dover in England • Fossilized remains of marine protists – Stromalites • Fossilized microbial communities up to 2 billion years old – Cyanobacterial fossils • Found in Australia • 3-3 5 billion years old Stromalites: Hamilin Bay, Australia
Chapter 10: Classification of Microorganisms
A very common stain to distinguish 2 bacterial types: Process: 1) primary stain 2) add mordant 3) decolorize* 4) counter stain • retain primary stain Gram positive • thick cell wall, NO outer membrane • retain only the counter stain Gram negative • thin cell wall, have outer membrane 1 23* 4 * key step
What are microbes?
What are microbes? A microbe is a tiny living thing that is too small to be seen by the naked eye Microbes are found all around us and live in soil, in water, in the air, and on the human body Sometimes microbes are called microorganisms Some types of microorganisms or microbes can make us sick while others help to keep us healthy
Properties and Classification of Microorganisms
types of food poisoning Bacteria also vary somewhat is size, but average about 1/25,000 inch In other words, 25,000 bacteria laid side by side would occupy only one inch of space One cubic inch is big enough to hold nine trillion average size bacteriaŠabout 3,000 bacteria for every person on earth Bacteria multiply by binary fission or
6-17 MICROBES AND FOOD - Science Olympiad
• Microbes play a key role – bacteria and fungi – in food spoilage and decomposition • Many types can live at low temperatures as mold on food in the refrigerator • Food preservation techniques as salt and high acid affect microbes Contamination of Fresh Foods – Food is considered contaminated when unwanted microorganisms are present
Prepared for the UW-Madison The Wonderful World of Microbes
Xl Types of Microbes lW Scientists classify organisms using ttaxonomic groupingsaxonomic groupings Domain is the broadest group Two of the domains (Bacteria and Archaea) include microbial organisms with no nnucleusucleus To distinguish the third domain, domain Eukarya, from the all-microbial domains Bacteria and Archaea, all we need to ask is:
Bacterial Classification, Structure and Function
2 Describe the different types of bacteria 3 Discuss bacterial structure and the function of the different bacterial components 4 Discuss the distinguishing characteristics of Gram positive and Gram negative bacteria For this lecture you should focus on the major concepts and not on the names of the different bacteria
4 rumen microbes
Title: 4 rumen microbes indd Author: Lori Bocher Created Date: 8/20/2007 11:43:31 AM
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