Search found 5 matches

by spirochete
Sun Jul 20, 2008 6:54 am
Forum: Cell Biology
Topic: The concept of ATP -> ADP and energy releasal
Replies: 3
Views: 4294

In most chemical reactions bonds are both broken and formed. Hydrolysis is an example. In hydrolysis the elements of water are added across a bond. ATP is an example of a molecule which has a high free energy of hydrolysis. This doesn't mean that energy is released when any bond in ATP is just broke...
by spirochete
Mon Apr 28, 2008 2:38 am
Forum: Microbiology
Topic: How long does a strain of bacteria remain in a cow?
Replies: 2
Views: 3270

Re: How long does a strain of bacteria remain in a cow?

In experimental models animals animals infected with O157:H7 invariably seem to stop carrying it after a certain time period, maximum about 40 days. I would speculate it's because O157:H7 is outcompeted by non pathogenic E. coli which aren't wasting energy maintaining virulence factors and the extra...
by spirochete
Thu Apr 24, 2008 6:05 pm
Forum: Microbiology
Topic: How long does a strain of bacteria remain in a cow?
Replies: 2
Views: 3270

How long does a strain of bacteria remain in a cow?

I've been reading about methods for preventing E. coli O157:H7 carriage in cattle, and found that cows inoculated with O157:H7 carry the strain for about a month before it's no longer detected in the feces. My question is: is this normal or unusual? Do some strains take up permanent residence or is ...
by spirochete
Sat Jan 05, 2008 2:07 am
Forum: Microbiology
Topic: how to culture cyanobacteria from mangroves
Replies: 4
Views: 2928

Re: how to culture cyanobacteria from mangroves

cyanobacteria are nitrogen fixers so you can help isolate them by growing in a nitrogen free culture.
by spirochete
Sun Sep 09, 2007 7:06 pm
Forum: Microbiology
Topic: blood agar hemolysis by gram negative bacteria?
Replies: 3
Views: 14181

blood agar hemolysis by gram negative bacteria?

I've looked all over and I can only find information on blood agar hemolyis for gram positive bacteria. Can I take this to mean that gram negative bacteria are generally gamma hemolytic? If so, are there any notable exceptions to this?