Top 3 Favourite Bacteria
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Top 3 Favourite Bacteria
Mohd Saufi bin Mohd Azehar
IES080034
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Streptococcus lactis
A gram-positive bacteria
A bacterial species found commonly as a
contaminant in milk and dairy products A common cause of souring and coagulation
of milk
Some strains produce nisin, a powerfulantibiotic that inhibits growth of many other
gram-positive microorganisms
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Used to make buttermilk
Buttermilk is used for baking as wellas drinking. It makes pancakes,waffles,and cakes rise very well
Streptococcus lactis ferments the
lactose in milk to lactic acid. Theacidic pH causes the protein in milk(most prominently casein) toprecipitate, thickening the liquid
Buttermilk should cause less of aproblem for those who are lactoseintolerant because some of thelactose has been broken down tolactic acid
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Streptococcus lactis
Gram stain of buttermilk (1000x), showing
Streptococcus lactis (purple)
with a pink background of milk protein
(casein)
LA(Luria Agar) plate streaked
with Streptococcus lactis and
incubated at 37C for 24 hours; top
view
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Vibrio fischeri
Luminous, Gram-negative, marine
heterotroph
Family Vibrionaceae
Can be found throughout the
world in temperate andsubtropical regions
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Symbiosis ofVibrio fischeri
and the Hawaiian squid,Euprymna scolopes
The squid camouflages itselfby projecting light downwardfrom its light organ. Inside thelight organ are luminescentbacteria, Vibrio fischeri, that
produce the light Housed in the squid's mantle
cavity
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The squid provide Vibrio fischeriwith shelter
and a stable source of nutrients The ability ofVibrio fischericells to produce
bioluminescence results from the expressionof the luxoperon
Expression of luminescence is dependent oncell density and thus light is not seen unlessthe bacteria are in high concentration, like inlight emitting organs of fish and squid
This phenomenon is known as quorumsensing
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Pseudomonas aeruginosa
A gram-negative bacteria
Rod-shaped bacteria
Belongs to the family Pseudomonadaceae
Widespread in nature, inhabiting soil, water,plants, and animals
P. aeruginosa secretes a variety of pigments:
-pyocyanin (blue-green)-fluorescein (yellow-green and fluorescent)
-pyorubin (red-brown)
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This bacterium can be found on the skin ofhumans and not cause disease, perhaps we
would call it a commensial, but if the person hasa severe burn P. aeruginosa can cause aninfection and becomes a pathogen. This type oforganism is called an opportunistic pathogen
It is the most common pathogen isolated frompatients who have been hospitalized longer than1 week
It is a frequent cause of nosocomial infections
such as pneumonia, urinary tract infections(UTIs), and bacteremia. Pseudomonal infectionsare complicated and can be life threatening
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Invasive burn wound
infection implies thatbacteria or fungi
proliferating in burn
eschar are invading
the underlying viabletissues. These wounds
display a change in
color, new drainage,
and, commonly, a foulodor. This infection
can be life threatening
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Management of burn blisters is controversial. Many can be left
intact to facilitate comfort, while the underlying wound heals.
Sometimes, blisters obscure full-thickness wounds, as shown
here, but, usually, wounds underlying blisters are partialthickness
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Escharotomy to release the chest wall and allow for
ventilation of the patient
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Splinting a serious hand burn
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