aula microbiologia bactérias
TRANSCRIPT
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• Bacilos: forma de bastão
• Cocos: forma esférica
• Espirais:
-Vibrião: forma de vírgula
- Espirilos e Espiroquetas: forma de saca-rolhas
Formas:
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Arranjos:
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Gram-positiva
Gram-negativa
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Bactérias Gram-positivas
Bactérias Gram-negativas
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- Quando os nutrientes essenciais se esgotam, certas bactérias gram+como as dos gêneros Clostridium e Bacillus formam células especializadas de “repouso”, denominadas endosporos.
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• Prolongamento da superfície da célula.• Origina-se na membrana plasmática.• Polímero de flagelina (proteina globular).• Totalmente distintos das células eucariontes.• Função: locomoção.
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•Pequenos prolongamentos protéicos IMÓVEIS, mais curtos que os flagelos.•Promovem a adesão da bactéria a substratos/ superfícies.-E. coli apresenta muitas fímbrias.-Anticorpos contra fímbrias bloqueiam a adesão da bactéria•Pêlo-F é usado na conjugação- Troca do material genético.
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Pili. O pilus de uma célula de Escherichia coli, que está realizando a transferência genética com uma segunda célula, é revelado pelos virus que se aderiram a ele. As células apresentam cerca de 0,8m de largura.
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Questões:
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