Lecture%2011

Lecture%2011 - Enterobacteria and relatives Gram positive...

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Enterobacteria and relatives Gram positive endospore forming Listeria Staphylococcus Helicobacter pylori Protozoa Parasitic worms
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www.cod.edu/PEOPLE/FACULTY/FANCHER/ProkEuk.htm Larger in size Usually only have cell membrane Clear nucleus with condensed DNA in chromosomes Several organelles: mitochondria, Golgi apparatus, ER, vacuoles Smaller Cell wall made of peptidoglycan No nucleus, dispersed DNA No organelles Sensitive to antibiotics
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All cause food borne infections Protozoa: unicellular microorganisms Worms: multicellular parasites Complex life cycles Difficult to eradicate Divided into two groups Associated with poor sanitation Contracted through consumption of under-cooked meat
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Trophozoites: Vegetative, asexual cells Cysts: Dormant stage (endospores) Sexual stage (meiosis): trophozoites form gametes, gametes pair and zygote undergoes meiosis into sporozoites Enveloped as Oocysts
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Amoebic Dysentery Human host Transmitted through fecal- oral route Long term carrier status (difficult to eliminate)
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The disease: dysentery and liver infection Proliferates in colon bloody diarrhea Liver infection severe fatigue, susceptibility to other infections Intermittent dysentery due to re-colonization of the colon and long-term carrier status
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Rapid building to get ready
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This document was uploaded on 03/29/2010.

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Lecture%2011 - Enterobacteria and relatives Gram positive...

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