Colonies

... and others will be coagulase (-). You may have access to TGA (Tellurite-Glycine Agar) plates, which differentiate coagulase + (black pigmented colonies) and coagulase - (grayish, or white)although it's certainly not perfect. By "whitish" in pigment, I'm assuming you have already tested ...

See entire post

I need to identify an unknown from the environment, but am having trouble finding somewhere to start. I have quite a bit of information. Colonies are cream colored. It is gram positive. It grew at high concentrations of sodium chloride (.5%,2%,%5,20%). It grew at 4 degree celsius and 25 degree ...

See entire post

... and calcimicrobes.[3] Before about 580 million years ago, most organisms were simple, composed of individual cells occasionally organized into colonies. Over the following 70 or 80 million years the rate of evolution accelerated by an order of magnitude (as defined in terms of the extinction ...

See entire post

Beta haemolysis is a clear area around the colonies. Alpha haemolysis is a greenish area around the colonies. There's also so called gamma, which is technically no haemolysis.

See entire post

you should see a halo around the colonies, see an exemple on that page (scroll down to the differences between alpha, beta and gamma hemolysis): http://www.answers.com/topic/hemolysis

See entire post