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15 Cards in this Set

  • Front
  • Back
porcelain filters used to filter( remove) bacteria
charles chamberland
some filtrates remained infectious???
dmitri ivanovsky
"contagium vivium fluidium" contagious living fluid
Later coined the name virus(meaning poison or venom)
martinus beijerinck
prior to 1930's : lack of technology needed to :
observe and analyze was not available
crystallizied the first virus(TMV), consisted of protein and RNA
viruses first obsered with an electron microscope
wendell stanley
certain inherited traits seem to be passed from parent to offspring as discrete hereditary : particles"
mendel's particles: gregor mendel
genetic material of some virus was DNA
hershey and chase
contain a single type of nuclei acid , either DNA or RNA
contain a protein coat(capsid) around the nucleic acid
is antigenic/immunogenic (stimulates antibody production)
some virus have an envelop around the protein coat
mutiply inside the living cells( virus cant synthesize the protein of generate ATP)
viruses take over the metabolic activity of host cells
important for clinical control: difficult to disrupt viral replication without interfering with host cell function.
general characteristic and structure of viruses
helical/ spiral
icosahedral (20 sided polyhedron)
phage tail fibers attach to specific receptors on bacteria
attachment/ adsorption
phage release enzyme->
Lysozyme: dissolves part of the bacteria cell wall
tail sheath contracts and drives phage core through the cell wall
viral DNA takes over the machinery of the host cell and begin producing viral DNA and structural components
phage DNA assembles into complete viruses
maturation/ assembly
phage lysozyme breakd down bacteria cell wall and mutiplied phages are released
release/ lysis
the time from adsorption to release
burst time