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Bacteria in our Lives

Career Day For Girls Demo

Mohanned El-Natour

on 26 February 2011

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Transcript of Bacteria in our Lives

Bacteria in Our Lives Northwestern University
Career Day For Girls
02.26.2011 > bacteria are present on almost everything that you touch

> The average person’s body contains 2-5 pounds of bacteria

> Some bacteria cause us to get sick, but the majority of bacteria do not harm us. In fact, many actually help us to digest food and prevent harmful bacteria from growing in the body. Biofilms > A biofilm forms when bacteria sticks to each other and to a surface.

> The biofilm makes a slimy substance that helps the bacteria stick to the surface and to each other

> A biofilm can be formed of a single bacterial species. But it might be made of a lot of bacterial species, as well as fungi, algae, and protozoa where are biofilms found? types of bacteria >> bacteria come in three different
shapes or morphologies: how can we observe and study microbes? >> use microscopes
>> Grow Bacteria in Laboratory the gram stain > Gram staining is a differential staining technique that provides an easy way to differentiate between bacteria into two different groups:

>>Gram positive
>>Gram negative

> Basic classification of bacteria is based on the cell wall structure. The Gram Stain process includes the use of:
*a primary stain (crystal violet)
*a mordant (helper) iodine solution,
*a decolorizer(.95% ethanol),
*a counterstain (safranin).

how to grow bacteria in a lab: >> Take a sample of bacteria from everyday life (ex. Bathroom, carpets, rivers, etc.)

>> Agar is a culture medium that contains nutrients for bacteria growth

>> Spread bacteria on agar plates. One bacteria reproduces millions of offspring that finally form one visible colony. >> bacteria are Everywhere!
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