AnatomiaBacteriana-2010
Transcript of AnatomiaBacteriana-2010
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MICROSCOPIA Y MORFOLOGIA CELULAR
AGRUPACION
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Table 3.1 componentes de la célula procariota
Pared celular: protección contra lisis osmótica, morfología celular.
Espacio periplásmico: enzimas hidrolíticas (degradación de sustratos), unión a proteínas transporte de sustratos-quimiotaxis
Membrana plasmática: Barrera de permeabilidad selectiva, Transporte de nutrientes y deshechos celulares. Localización de los principales procesos metabólicos (respiración, fotosíntesis), Detección de factores ambientales (quimiotaxis)
Ribosomas, síntesis de proteínas (Subunidades 30S y 50S.
Nucleoide: región de localización del material genético (ADN)
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Vesículas de gas: regulación de la densidad de células por flotación en ambientes acuáticos
Cuerpos de inclusión: reserva de C, fosfato, azufre.
Fimbrias y pelos: adherencia a superficies, conjugación. Factor de virulencia.
Flagelos: movilidad (swimming, swarming-twitching)
Cápsula: resistencia a la fagocitosis, adherencia a superficies. Factor de virulencia.
Capa S: capa de naturaleza proteica o glicoproteína. Estructura cristalina. Mantiene la forma y rigidez en algunas bacterias. Promueve la adhesión a superficies. Resistencia a la fagocitosis, adherencia a superficies. Factor de virulencia.
Endosporos: sobrevida bajo condiciones ambientales adversas.
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Diploptene (Hopanoid)
Colesterol (Sterol)
Compuestos que refuerzan la membrana citoplasmática
Eucariotas
Procariotas (B)
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MEMBRANA CITOPLASMATICA DE ARQUEAS
isopreno
Bacteria
Arquea
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Glicerol dieterGlicerol tetraeter
Fitanil (20C)
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PARED CELULAR
PEPTIDO GLICANO (Mureina)
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PARED CELULAR GRAM NEGATIVO
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PARED CELULAR GRAM POSITIVO
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Ac teicoicos: Polímeros del P-ribitol o P-glicerol
GRAM-Positivos
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Pared celular bacteriana
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Síntesis del PEPTIDOGLICANO
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Lipoarabinomanan
P-inositolmanosido
Pared celular
Arabinogalactano
Ac. micólico
Lipidos
m.c.
PG
PARED CELULAR Mycobacterium
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Paredes de Arqueas:
Pseudopeptidoglicano: NAG---NA.talosaminuronico, U-1,3
Pared de Methanosarcina: Glucosa-glucuronico-galactosamina-Acetato
Pared de Halococcus: Glucosa-glucuronico-galactosamina-SO4=
Las paredes de Arqueas son resistentes a Penicilina y a lisozima
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Fig. 1 Intracellular lipid inclusions in bacteria. A) Electronmicroscopical photograph of TAG-inclusions in Rhodococcus opacus PD630. B) Wax ester-inclusions in Acinetobacter calcoaceticus ADP1.
Chromatium vinosum, a purple sulfur bacterium, with intracellular sulfur granules, light field (2,000).
Magnetotactic Bacteria. (a) Transmission electron micrograph ofthe magnetotactic bacterium Aquaspirillum magnetotacticum.
Polyhydroxybutyrate in Ralstonia eutropha H16
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Description: Cells were cultivated on YPD agar for 48 h at 28C. A heat fixed smear was stained with Sudan black and counterstained with safranin. The slide was observed under brightfield microscopy with a 100 X oil immersion objective
Bacillus thuringiensis cells stained for the presence of PHB
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Unspecified species (~1000x) This slide has been negatively stained (with congo red ) to show the presence of the mucopolysaccharide capsule.
Cápsulas
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La disposición de flagelos(valor taxonómico)
Movilidad: swimming swarming twitching
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Exemple de coloration flagellaire (Leifson) d'une souche de Vibrio
Microorganismo: MonotricoLofotricoAnfitricoPeritrico
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Proteus vulgaris Ba 156 (~2000x) A special stain (pararosaniline) has been used to build up the flagella so that they can be seen on this peritrichous bacillus.
Flagelos
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Spirillum with Amphitrichous Arrangement of Flagella
Spirillum volutans
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Rotación CAR
Rotación AR
QUIMIOTAXIS:
Movimiento hacia un atrayente químico y desde un repelente quimico.
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Schematic diagram of bacterial chemotaxis signal transduction.
Stock A M PNAS 1999;96:10945-10947
©1999 by The National Academy of Sciences
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Espiroqueta
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A. Célula de Treponema dentícola observada por microscopía de campo oscuro. Treponema dentícola es una espiroqueta responsable de la peridontitis. Barra: 5 mm. B. Célula de Treponema dentícola en el proceso de división celular. La célula se alarga separándose en dos células hijas. Barra: 5 mm. C. Microscopía electrónica de lo que queda de una célula luego que la membrana externa es removida por tratamiento con detergente (1 % de deoxicolato de sodio por 10 mins). Después del tratamiento, los filamentos flagelares periplasmáticos (PFF) se sueltan, y pueden observarse los filamentos citoplasmáticos (CF). Barra: 1 mm. (3).
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Exosporio
Cubierta del esporo (Proteína /queratina)
Córtex (peptidoglicano con uniones laxas)
Core (Nucleoide y Ribosomas)
DeshidrataciónSíntesis de acido dipicolínicoAcumulación de Ca++Descenso del pHSíntesis de SASPs
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Clostridium tetani, (~2000x) Note that the cells with spores look like lollypops in this etiological agent of tetanus.
Clostridium botulinum, (~2000x) These cells bearing spores are only slightly enlarged at the spore containing end in this etiological agent of botulism, caused by a protienaceous exotoxin which
ClasificaciónMorfologíaAgrupación
Se infiere la presencia de esporos
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(Bacillus anthracis). A rod-shaped, spore-forming bacteria that causes anthrax in animals and humans. GRAM
Dorner. In this stain, red endospores are in coloreless cells.
Moeller. Clostridium
Forma del esporo
Posición del esporo
Deformante o no deformante
Esporos