Search found 431 matches

by JorgeLobo
Wed Dec 03, 2008 11:26 pm
Forum: Cell Biology
Topic: Contractile Vacuoles?
Replies: 3
Views: 3600

You can't say "why." That presumes a "reason" exists. But consider what contractile vacuoles do - they effect osmoregulation in siolated cells such as those of paramecia. With very very few exceptions, human cels are organized - not isolated. Osmoregulation is matained by the org...
by JorgeLobo
Wed Dec 03, 2008 11:20 pm
Forum: Evolution
Topic: 5 best proofs of evolution
Replies: 170
Views: 350024

There is no "proof " of evolution. It's a theory - and one that's is generally accepoted by the appropriate scientific community.
by JorgeLobo
Wed Dec 03, 2008 11:16 pm
Forum: Microbiology
Topic: Help asap! Cant find unknown Bacteria
Replies: 3
Views: 4723

Re: Help asap! Cant find unknown Bacteria

This is realy poor dschenberger. "Clear" - does that mean no growth? Manitol salt agar - tan??? The stuff is red or, with growth of salt tolerant mannitol fermenters, yellow. Did you even get growth? Urease? What did you use? If you had no growth on conventional media (assume that's "...
by JorgeLobo
Tue Dec 02, 2008 10:34 am
Forum: Microbiology
Topic: Contractile Vacuoles?
Replies: 1
Views: 3020

Re: Contractile Vacuoles?

As in the osmoregulatory contractile vacuoles in paramecia?

Human cells don't need individual means for osmoregulation as oiur cells are not free living,
by JorgeLobo
Sat Nov 29, 2008 5:31 pm
Forum: Ecology
Topic: hypo and hyper osmotically??
Replies: 3
Views: 17613

Look up water activity. In the broader context - there are organisms adapted or evolved to proliferate in high and low water activity (hyper and hypotonic conditions). Many organisms respond to hypertonic environments by accumulating solutes.
by JorgeLobo
Sat Nov 29, 2008 5:24 pm
Forum: Microbiology
Topic: help to identify unknown bacteria
Replies: 1
Views: 2959

Vosk - you need to add colonial and cellular morphology, motility observations. The "positive" results doesn't tell enough - for example, does "dextrose positive" mean growth or acid from assimilation or fermentation?
Look in Bergey's.
by JorgeLobo
Sat Nov 29, 2008 5:18 pm
Forum: Microbiology
Topic: Help Identifying Unknown Bacteria
Replies: 6
Views: 12110

I have no idea how you "found out" but the results you offered are not consistent with Listeria monocytogenes. Your explanation is silly - but does indicate you probably did not have a pure culture. this is a critical element of any micro study and i suggest you concentrate on it.
by JorgeLobo
Fri Nov 21, 2008 11:18 pm
Forum: General Discussion
Topic: UVB Rays-Apple Decaying Rate.
Replies: 10
Views: 6582

Re: UVB Rays-Apple Decaying Rate.

by JorgeLobo
Fri Nov 21, 2008 12:30 pm
Forum: Microbiology
Topic: Food spoilage
Replies: 2
Views: 2876

Re: Food spoilage

Sounds like you're asking for help with your homework - or a take-home test.
by JorgeLobo
Mon Nov 17, 2008 12:21 am
Forum: Microbiology
Topic: Minimal media question
Replies: 4
Views: 4068

Try anaerobiasis.
by JorgeLobo
Mon Nov 17, 2008 12:17 am
Forum: Microbiology
Topic: Best general purpose media?
Replies: 7
Views: 12782

It;s hard to imagine that anyone wgo had worked in microbiology would not be familiar with nutrient agar.

Malt agar is not a good general purpose medium. I recommend trypticase soy agar as recommended for general recovery by FDA.