griffith vivo virulento liscio vivo avirulento rugoso capsulatoacapsulato
TRANSCRIPT
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Griffith
VivoVirulento Liscio
VivoAvirulento Rugoso
capsulato acapsulato
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UccisoVirulento Liscio
VivoAvirulento Rugoso
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TRASFORMAZIONE
DNA nudo di cellule morte
ricombinazione
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Non tutte le specie batteriche sono trasformabili
Per essere trasformate le cellule trasformabili
devono essere competenti
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CURVA DI CRESCITA DEI BATTERI IN TERRENO LIQUIDO
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Trasformazione plasmidicaE.coli
Permeabilizzazione membranacon ioni calcio
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S. PneumoniaeBacillus subtilisNeisseria meningitidis Neisseria gonorrhoeaeHaemophilus influenzaePasteurella multocida
Trasformazione naturale
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DNAsi
XX Raccolta su filtro
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DUS DNA Uptake Sequences
Decameri over-rappresentati
Trasformazione specie-specifica
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Antibiotico resistenza
DNA specie-specifico
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CICLO LITICO
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Lytic cycleLytic cycle
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LISOGENIA
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TRASDUZIONE SPECIALIZZATA
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TRASDUZIONE GENERALIZZATA
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Virus puro
100.000-1000.000 particelle virali
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Plaque Assay
bacteria + phage
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Batterio auxotrofo(his-)
Batterio autotrofo(his+)
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Conversione lisogenicaGeni fagici possono accrescere la virulenza del batterio
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Lysogenic ConversionExamples of Virulence Factors Carried by Phage
Batterio fagoProdotto
gencofenotipo
Vibrio cholerae CTX phagecholerae
toxincholera
Escherichia colilambda phage
shigalike toxin
hemorrhagic diarrhea
Clostridium botulinum
clostridial phages
botulinum toxin
botulism
Corynebacterium diphtheriae
corynephage beta
diphtheria toxin
diphtheria
Streptococcus pyogenes
T12erythrogenic
toxinsscarlet fever