Natural Science Forum / Biology / Microbiology / June 2006

 can anyone tell me why subculturing of bacteria loses its antigenic property or virulence character
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What odorous chemicals do anaerobic bacteria [excluding the
acetic-acid-producing bacteria] produce when they feed on ethanol in an
oxygen-free environment? What do these compounds' odors resemble?
Thanks,

Greetings all
We are trying to measure the growth rate of rhizobium in different carbon
sources but encountering dificulties. The main issue is that in liquide culture
the bacteria seem to create "flakes" rather then homoginios turbidity, so

I want to have a bit of human stool analyzed for bacteria (aerob and
anaerob ones).
As I can not do it by myself and do not have an appropriate laboratory
available yet, I would like to conservate the stool for later culture

I'm not in the field.  I just like to study these things.  I'm
interested in understanding more about genetics, microbiology,
molecular biology, virology, etc.  Obviously for me, a layman, I don't
want anything incredibly dry, but I've found the common 'Demystified'

What does the phosphate backbone look like in DNA?  The first diagram
here:
http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookDNAMOLGEN.html,
list a triphosphate.  However, in this complete structure of DNA:

tRNA vs mRNA: which is more abundant in cells?and why?

Please can help me to find papers in
pesticide (insecticide-fungicide) effect on mycoflora of Vicia faba

I had a chance to look at the newest version of Gene (is it VIII?) and
though I can understand why it is popular.  As I'm new to this, I
didn't think that it presented a good ramp-up into subjects.  In
searching for info, I ran across a post that said earlier editions may

I am a novice in this field. Can anybody give me the answer to the
following question?
During the PCR process,the primer that is complementary to the desired
sequence is very important,right? Then if the original DNA contains

hi
 im starting  a project with bacillus species , they have been isolated from soil . if anybody know methods to screening and identify them , please tell me . all opinions are welcome .
 best wishes
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Salmonella is not normal flora of guts. This is what I understand so
far. But I found a strange statement in my study quiz book. Salmonnella
can be found in a normal flora of guts? Because E Coli and Salmonella
is so close genetically?