Human Microbiome Flashcards
Human Microbiome
all the microbes in the human body and includes species from each major domain
How many human cells are there in the body?
10^13
How many microbial cells are there?
10^14
What percentage of cell in the human body aren’t human?
75-90%
How does the nose protect you?
inhaled pathogens get trapped in the mucous
In the nose, Staphylococcus epidermidis:
forms a biofilm that coats the inside of the nose
How many bacteria do you have in your mouth?
10 billion
What’s on your teeth?
a biofilm or plaque
Fusobacterium sp.
larger bacteria that form a scaffold for many other bacteria in the oral biofilm
We have about __ sq ft of skin
19
How many million bacteria are there per inch of skin?
35
3 types of microhabitats
oily, dry, moist
Are bacteria on the skin gram-positive or gram-negative?
gram-(+)
Why is skin hard to colonize (4)
dry, salty, acidic, protective oils
3 attributes of Propionibacterium acnes
gram positive, digests sebum, causes acne
Helicobacter pylori
produces urease, which hydrolyzes urea, produces ammonia, and neutralizes stomach acid
4 characteristics of Helicobacter pylori
- gram negative
- most common cause of ulcers in humans
- causes stomach cancer
- urease positive
What 2 things may Helicobacter pylori protect you from?
asthma and GRD
Bacteroides thetaiotamicron
digests your food
Is Bacteroides gram (-) or gram (+)?
gram negative
