aula 4 bactérias geral
TRANSCRIPT
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BactériasBactériasAdila TrubatAdila Trubat
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Quantas bactérias cabem na ponta de um alfinete ?
1m
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Estrutura geral das bactérias
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Estrutura geral das bactérias
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Estrutura geral das bactérias
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Tipos de Metabolismo
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Tipos de Metabolismo bacteriano
Oxidação de compostos orgânicos ou inorgânicos
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Tipos de Metabolismo
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Bactérias : temperatura
em que vivem
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Crescimento microbiano• O crescimento microbiano é normalmente associado ao crescimento de uma população de células de um dado microrganismo, ou seja, com o aumento do número de células da população.
• Grande parte dos microrganismos multiplica-se por fissão binária ou por gemulação, em resultado do que uma célula dará origem a duas ao fim de um certo tempo, tempo de geração ou de duplicação.
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Classificação dos seres vivos
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Classificação dos seres vivos
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Classificação dos seres vivos
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Classificação das bactérias
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Eubactéria ArchaeaEukaria
Parede celularParede celularPeptidoglicano
ácido murâmicoPseudo –peptidoglicano
Polissacáridos
Proteínas Glicoproteínas
Celulose
Quitina
Classificação das bactérias
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Eubactérias
São as bactérias propriamente ditas. As que encontramos em ambientes “comuns”.
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Formas das bactérias
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Formas das bactérias
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Formas das bactérias
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EubactériasParede Celular – coloração de Gram
A coloração de Gram diferencia dois grandes grupos de eubactérias.Gram+ fixam o cristal violeta e ficam azuisGram- não fixam o cristal violeta e precisam ser coloridas de vermelho para serem visualizadas.
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EubactériasParede Celular
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EubactériasParede Celular
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EubactériasParede Celular
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Reprodução:Divisão binária
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Conjugação bacteriana - transferência de fragmentos de DNA (plasmídeos) de uma célula para outra.
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Conjugação bacteriana - transferência de fragmentos de DNA (plasmídeos) de uma célula para outra.
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Principais AssociaçõesMutualismo: associação que beneficia os
participantes da relação. Ex.: algumas bactérias que vivem no intestino humano.
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Principais AssociaçõesComensalismo: a bactéria se beneficia sem
prejudicar o outro organismo. Ex.: algumas bactérias que vivem na pele humana.
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Principais Associações• Parasitismo: bactérias que habitam o corpo de organismos vivos onde se reproduzem e se alimentam causando-lhes doenças (parasita e hospedeiro).
Parasita: Bacilo de Koch.Hospedeiro: Ser humano.
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Nossas defesas contra as bactérias
Defesas naturais:• Proteção contra microrganismos: pele e mucosas;• Ataque pelos glóbulos brancos (por fagocitose);• Produção de anticorpos.
Defesas artificiais:• Vacinas, soros e antibióticos.