Outer Membrane of Gram-negative Cells
like a stiff “canvas sack” around the bacterial cell. maintains cell structure. is a permeability barrier to large molecules (like lysozyme) and hydrophobic molecules; also [...]
8
03, 2021
8
03, 2021
The Structure of Bacterial Cells
Structure Chemical Composition Function Essential Components Cell Wall Peptidoglycan Outer membrane of Gram- negative bacteria Surface fibers of [...]
8
03, 2021
Medically important bacteria that cannot be seen in the Gram stain
Name Reason Alternative Microscopic Approach Mycobacteria (Ex. M. tuberculosis) Too much lipid in cell wall so dye cannot penetrate Acid-fast stain Treponema pallidum Too thin [...]
8
03, 2021
Classification of Bacteria
It is difficult to classify all bacteria into clear-cut categories. Various classification methods are used, depending in part, on the purpose. Nomenclature Bacteria are [...]
8
03, 2021
Eukaryotes vs. Prokaryotes
Property Prokaryotic Bacterial Cells Eukaryotic Human Cells DNA within a nuclear membrane No Yes Number of chromosomes 1 More than 1 Mechanism of Replication [...]
5
03, 2021
Bacterial Classification and Structure
Learning Objectives: You should be able to: describe the major differences between eukaryotic and prokaryotic cells and explain why it is important to know the [...]
5
03, 2021
Infective Syndromes
The study and diagnosis of infectious diseases is approached from an organ system perspective. Upper and Lower Respiratory Tracts Gastrointestinal Tract Urinary Tract Genital Tract [...]
5
03, 2021
Immunity and Immunization
A. Observations of “acquired immunity” to diseases and primitive vaccination practices contributed to our understanding of the immune response to infectious agents and the design [...]
5
03, 2021
Other microorganisms as causative agents of disease
Relative sizes of microorganisms: Protozoa > Red Blood cell > Yeast > Bacteria > Mycoplasma > Viruses Fungi 1. David Gruby (1841-1845) identified yeast infections [...]
4
03, 2021
Microorganisms and Their Human Hosts
Most microorganisms are not pathogenic for humans. Commensal microorganisms (mostly bacteria) make up the normal flora of the human body; they are generally harmless and [...]