|Bio Oct 10
Exam on the 31st
Field trip take homes(lost lake) things you should know
1. saw firsthand a cople of the biotic communities of your assignment
-can not use any photos from lost lake. You will lose point if you do
2. valley grassland before and after
-why the changes
-3 inventions that alter settlement and biotic communitites
3. California indioans: primative?
Tues the 29th is the photo essay due date
Current news: salmonella, and food born illnesses!
With an added “finger” to you the american voting citizen
Brought to u by the people in Washington
Fresno made the news!
Foster Farm chicken could have sicken 10,000 people with salmonella.
Disease control is shut down
Salmonella is a bacteria that can make you sick. Not all salmonella are the same. Some make you really sick some make you a little sick. Find out what strain it comes from.
About 42 percent of those sickened had to be hospitalized. That’s when were concerned. This is a scary form. 1 of this 7 strains is resistant to antibiotic. So it can kill you.
This brings us to bacteria
You grandma is trying to kill you
Bacteria- the dominant life form on the planet
What makes bacteria, bacteria.
What separates bacteria form all the other kingdoms?
Its Prokaryotic! Doesn’t have a nuclease
How different are there DNA
How come is there so much differences is there DNA code? First billion years on earth had no sign of life. Amino acid are developing. They build protein, structure. Theres bacteria on eath for billions of years. DNA mutans
A billion years ago plants start showing. Humans been on earth for a few time.
They are everywhere
-10 billion in your mouth-right now
-25% of your body weight
Why are they so successful
-time, evolution produces diversity
-abilitiy to mutiply
Conjegation in bacteria swapping DNA.
-by bumping to other bacteria they can swap plasma can make them resistant to antibiotic.
Many are beneficial
- we can identify who you are by the bacteria covering you skin
- if you have good bacteria bad bacteria cant invade your body
- they help you digest food
- when you go on antibiotic you always going to the bathroom because it removed the bacteria in your stomach
some bacteria eat oils.
They brake them down
We use them to help us when theres an oil spill
Biological pest control
bacillus thuringensis or BT
produces like a cystal when it gets in the gut in insects and it kills them
good if you grow tomatoes so insects wont eat up your plant
some by yeast- different
Bacteria causes sour
Produces vinegar, beer
Pathogens- agents which casue disease
to cause a diseas a bacterium must do 2 things
1 invade, attach, and mutiply in a host tissues or ells
2 produce a toxin- chemical whch intergers or destroys a host
Food borne illnesses
1. contamination-modern food processing
2 rapid replication- improper refrigeration, handling
3 no preventative actions- no sterilization
bacteria cant divide under 40 degress. And is killed over 130 degrees.
Food Poisoning In USA
76 millionn cases per year about 1 in 4 US citizens
325,000 hospitalizations 1 in 840
5,000 deaths 1 in 55,000
data from CDC
one quarter of hospital admittance for food poisoning
happen on 1 day of the year. The day after thanksgiving
nana’s trying to kill you