Growth of Yeasts

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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Marlou en Rowan
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Growth of Yeasts

Post by Marlou en Rowan » Thu Jun 08, 2006 1:15 pm

Hi,

I had an experiment last week, and I was wondering why yeasts doesn´t grow at 10, 20 and 60 degrees. Can somebody explain to me why it doesn´t grow?

Thanks a lot for the person who can help me.

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canalon
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Post by canalon » Thu Jun 08, 2006 2:02 pm

Hi,

I had an experiment last week, and I was wondering why students in a short and a golf shirt can't do their homework at -4, 5 and 60 degrees. Can somebody explain to me why they refuse to work?

Of course this is a pun, to basically tell you to do some research before asking us to do your homework for you. But, somehow, the reason would probably be the same. Think about the role of temperature in chemical reactions, and in molecules stability.

Good luck
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

Marlou en Rowan
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Post by Marlou en Rowan » Thu Jun 08, 2006 2:05 pm

This isn´t my homework, I´m very interested in biology. I´m a student. So I wanted to do this experiment, and I want just to know the answer. Can somebody else help me? :shock:

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canalon
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Post by canalon » Thu Jun 08, 2006 2:15 pm

But I really gave you elements to get an answer!

What happens when you put egg white at 60ºC? Egg white is made of proteins as weel as many enzymes necessary for yeast reproduction?

Why do you put food in the fridge? And what happens when an insect goes into the fridge? why?

Answering those questions may well help you find your answer. By the way, yeast grows at 20ºC
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

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Post by Marlou en Rowan » Thu Jun 08, 2006 2:18 pm

Thanks a lot, I understand it now and go futher with some experiments !

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Post by raju » Fri Jun 09, 2006 6:40 am

hi i think i can help u in this matter but u need to analyse the thing in normal and natural rather than an complicated and laboratry manner
all the micro organisms which we take in order for our studies in lab definetly has some or the other natural source .so when we r working with them in the lab we need to provide the same type of environment
for example
E-COLI which we work with in nature is found in intestine of human where the temp is 35 - 40 hence we in lab keep them at 37 in aerobic conditions
if any other organism is taken which we obtained from water like salmonella taiphe we incubate it at 24
like wise the organism ur intrested grows optimum at 30 bellow or above that temp its not that it will not grow but its growth rate will decrease due to the mal function of certain enzymes
i think u got it
ur friendly
RAJU
the organisms that survive r not the one which r strongest nor the one which r briliant THEY R THE ONE WHICH RESPOND TO CHANGES IN NATURE FIRST

Marlou en Rowan
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Post by Marlou en Rowan » Fri Jun 09, 2006 1:46 pm

You also thanks :) .

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Post by mkwaje » Fri Jul 07, 2006 12:50 pm

First of all, what type of yeast did you work on? And how did you conduct the experiment, did you use solid culture media or liquid media incubated at different temperatures? There might be experimental errors involved that prevented growth of your yeast.

Just like what Canalon said, I'm pretty sure yeast grow on 20°C. I even think they can grow at 10°C albeit slowly. Notice some yeast spoilage of food left several weeks in your ref? Maybe you only need to incubate your yeast for a longer time to get noticeable growth. Remember yeast and fungi generally grows slower than bacteria so may not exhibit growth within 24 hours.

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