Rhizoid Colony Formation

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Rhizoid Colony Formation
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Bacillus subtilis.  These gram positive,
sporeforming rods produce colonies which are dry,
flat, and irregular, with lobate margins.
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Pseudomonas aeruginosa.  This gram negative rod
forms mucoid colonies with umbonate elevation. 
Some strains produce a diffusable green pigment
and a distinctive fruity odor.  P. aeruginosa is
an opportunistic contaminant of burn injurys,
wounds such as cuts and gunshot, and can cause
bacterial pneumonia.  It is often nosocomial
pathogen, easily transmitted by hands and
invasive medical procedures.
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Salmonella choleraesuis serovar typhimurium. 
This gram negative rod is a component of the
gastrointestinal tract of birds and reptiles and
is an agent of gastroenteritis in humans.  It
forms shiny, convex colonies with entire margins.
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Escherichia coli.  This gram negative rod
(coccobacillus) forms shiny, mucoid colonies
which have entire margins and are slightly
raised.  Older colonies often have a darker
center.
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Rhodospirillum rubrum.  Pinpoint circular
colonies which are convex with entire margins. 
This gram negative spirillum produces a
non-diffusable red pigment.
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Micrococcus luteus.  Circular, pinhead colonies
which are convex with entire margins.  This gram
positive coccus produces a bright yellow,
non-diffusable pigment
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Staphylococcus aureus.  Circular, pinhead
colonies which are convex with entire margins.
This gram positive coccus often produces colonies
which have a golden-brown color.
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Staphylococcus epidermidis.  Circular, pinhead
colonies which are convex with entire margins. 
The colonies of this gram-positive coccus appear
either the color of the agar, or whitish.
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Lenticular cloud
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Lenticular Cloud over Mt. Shasta
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Lenticular Shaped like a double convex
lens.Lenticular sproangia of Physarum viride
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Umbonate
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Colony Edge patterns
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Pellicle floating on broth
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Paramecium feeding on flocculent bacterial mass.
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Filamentous Bacteria in a Hot Spring
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The End