A bacteria culture starts with 480 bacteria and grows at a rate propotional to its size.After 2 hours there ar

there are 960 bacteria.


(a) Find the population after t hours


y(t)=?


(b) Find the population after 3 hours.


y(3) = ?


(c) When will the population reach 1550 ?


T = ?

A bacteria culture starts with 480 bacteria and grows at a rate propotional to its size.After 2 hours there ar
In this problem, we will use the formula for uninhibited growth, which A=A0*e^(kt) where A is the new amount, A0 is the original amount, k is the rate of growth, and t is time. First lets find the rate of growth, k.





960=480e^(2k)


2=e^(2k)


ln(2)=2k


k=ln(2)/2





Then we can find y(t)





a)


y(t)=480e^(t*ln(2)/2)





b)


y(3)=480e^(3*ln(2)/2) = 1 358





c)


1550=480e^(t*ln(2)/2)


155/48=e^(t*ln(2)/2)


ln(155/48)=t*ln(2)/2


t=[2ln(155/48)]/ln(2)


t=3.38 hours
Reply:a.) f(t)= 480t


b.) f(3)= 480(3) = 1440


c.)1550= 480t


t=3.229 hours
Reply:y(t) = 480 * 2^(t/2)


y(3) = 1357


T = 3.4 h

Can bacteria spread through phlegm?

If you spit out some phlegm, does the bacteria in it float in the air? Or does the bacteria only spread from the particles coughed out.

Can bacteria spread through phlegm?
Bacteria can be spread through air droplets, such as in tuberculosis. This happens with any exhalation such as coughing, talking, sneezing, that causes particles larger than 5 micrograms. The particles usually travel up to 3 feet away; but anyone entering the room should wear a mask.


Same goes for viruses, including chicken pox, flu, viral pneumonia, measles, etc.
Reply:both in the air and the phlegm

Vaginal Bacteria/ 38 weeks pregnant?

I would like to know if anyone of you had a bacteria infection that you got prescribed Metronidazole 500 MG tablet for it? I'm 38 weeks pregnant my doctor was delivering a baby and the Nurse Partitioner prescribe this for me, but I kind of feel some nurses still need more practice on prescribing medication. The nurse only gave me this prescription telling me that I had a yellow discharge and that was a bacteria and I needed to take this prescription so I can get rid of it.

Vaginal Bacteria/ 38 weeks pregnant?
I think you should do some research on this medication to be safe!!!Or you could always consult with another doctor!


Good luck!
Reply:here is a site you can look at. questions like this are best asked to your doctor. i never take anything (or for my children) unless i make sure i understand everything. i have been known to ask repeatedly until i understand. my doctor knows this so just tells me right away.....saves us both time.


http://womenshealth.about.com/od/bacteri...

daphne

Which bacteria have incubation period of less then 1 day?

Please list all bacteria pathogens that have incubation period of less then 1 day (i.e. bacteria which cause symptoms to show up in human after less then 1 day since infection occurred)

Which bacteria have incubation period of less then 1 day?
Bacteria themselves generally do not have incubation times that are as short as a single day. Some bacteria form toxins in food that can cause nausea and vomiting in a short amount of time (under 12 hours) when eaten. This is where most immediate reaction cases of food poisoning come from.
Reply:Anthrax?





Some foodborne bacteria can present after 12 hours, but it depends on the quantity of the bacteria consumed, otherwise it can be upto 72 hours before symptoms appear.





Salmonella, E. coli, Campylobacter
Reply:Salmonella 4 hrs to 3 days...

The number of bacteria present in a culture is given by N(t) = 15,000(3t), where N(t) is the number of bacteri

The number of bacteria present in a culture is given by N(t) = 15,000(3t), where N(t) is the number of bacteria after t hours. Find the number of bacteria present after 6 hours.

The number of bacteria present in a culture is given by N(t) = 15,000(3t), where N(t) is the number of bacteri
N(6) = 15 000 (3(6))





=15 000 * 18





=270 000
Reply:This is a problem of substitution. Where ever t is, place 6.





N(6) = 15000(3*6) = 15000(18) = 270000 bacteria present.
Reply:N(t) = 15,000(3t)


t = 6 hours


N(6) = 15,000(3*6)


N(6) = 15,000(18)


N(6) = 270,000 bacteria
Reply:N(t) = 15,000(3t)


Since time is 6 hours, N(t) = 15,000(3 x 6)


= 15,000 x 18


= 270,000 numbers of Bacteria present after 6 hours.

Can bacteria help reduce solid waste? More specifically, can bacteria break-down plastics? Is this practical?

I am researching methods of solid waste management. In particular, I am exploring bioremediation technologies. I am curious to know why bacteria are not more comonly used to eliminate plastics from landfills.

Can bacteria help reduce solid waste? More specifically, can bacteria break-down plastics? Is this practical?
Go to the Environmental Sciences (or equivalent) department of any University or College, and you will find students isolating specific bacteria to do thi very thing, amongst hundreds of other promising applications; bacteria are being 'trained' to eat plastics, diesel fuel, waxed paper, newspaper and polystyrene cups, among other things. The reason they are not more commonly used is probably a function of time economics. Once the fumes from burning trash begin to hinder the breathing of the grandchildren of government lawmakers, something might happen!
Reply:Plastics cannot biodrade so bacterica cannot decompose the substance. They breakdown organics.
Reply:Most plastics are not biodegradeable. In a landfill there is not enough oxygen for decomposition to occur.

Can bacteria live and grow in inorganic material such as clothing?

For instance, will the blood stained clothes a butcher wears, continue to harvest bacteria even if he (hypothetically) does not get more blood or new bacteria into his clothes?

Can bacteria live and grow in inorganic material such as clothing?
Nearly everything has a bit of organic matter on it from dust etc. Combine that with a bit of moisture and some bacteria can live.





Clothing is however usually organic (cotton, wool, silk, leather etc) and there may be enough nutrients there for some bacteria to grow given just a tiny bit of water. Some of the synthetic fibers such as nylon even can be used as food by some specialized (but rare) bacteria.





Clothing in general also usually has dead skin cells, sweat etc from our bodies and that is enough organic matter for bacteria to live on.





As for not geting new bacteria on an article of clothing. That is just about impossible outside of a clean room or a sterilized box. I seriously doubt any clothing that touches bare skin can be kept bacteria free. (regardless of how much the person just washed).
Reply:Blood is organic material - so your example doesn't fit your question.


There are plenty of bacteria that are photosynthetic, and therefore produce their own organic material to survive. - Therefore, yes!
Reply:I doesn't take much for bacteria to grow...in your example , yes it will continue to grow!

camellia