Bacteria .pdf

Bacteria Biomedical science Benjamin Tighe Intended Learning Outcomes By the end of this sessions students should be able to: Classify bacteria by: Shape, size and arrangement Structure Gram staining Environmental requirements Their name OAer relevant examples of bacteria associated...

Bacteria Biomedical science Benjamin Tighe Intended Learning Outcomes By the end of this sessions students should be able to: Classify bacteria by: Shape, size and arrangement Structure Gram staining Environmental requirements Their name OAer relevant examples of bacteria associated with denDstry Features of Bacteria Bacteria are small, single celled micro- organisms Ancient life form Same basic functions as other living cells Lack chlorophyll Usually have single circular DNA chromosome found within cytoplasm No membrane-bound organelles Size of Bacteria Shape of Bacteria Arrangement of Bacteria Structure of bacteria Complete bacteria work book to describe each of these features Flagellum Ribosomes Cytoplasm Nucleoid Plasma membrane Cell wall Capsule Pilus Gram staining Gram staining is a technique used to distinguish & classify bacterial species into two groups: 1. Gram-positive bacteria 2. Gram-negative bacteria The name comes from the Danish bacteriologist Hans Christian Gram, who developed the technique Gram staining Recall features you identified in the structure of bacteria workbook Cell wall – peptidoglycan – thick (gram positive) Cell wall thin peptidoglycan but thick lipopolysaccharide (gram negative) h?ps://www.youtube.com/watch?v=1SITCrgF3yk Which one is which? Environmental Requirements (complete bacteria workbook to describe each of these features) Carbon Moisture Oxygen Dioxide Temperature pH Light OsmoTc Mechanical eUect stress Label these types of bacteria in relaTon to oxygen environment Naming Bacteria ClassiWcaTon of organisms The systematic classification of organisms into ordered groups is Kingdom Procaryote called TAXONOMY Division Firmicutes The name is classically a combination of the last two ranks Subdivision Low DNA content Genus and Species Species does not begin with a Family Streptococcaceae capital letter Genus Streptococcus Name is usually in italics Generic names can be abbreviated Species Streptococcus salivarius e.g. S. salivarius Bacteria associated with denTstry Features of Bacteria Features of bacteria Relevance Shape & in dentistry arrangement Name Structure Oxygen Gram factor staining