Iron (II) is measured in abandoned mine drainage using a phenanthroline method (Standard Methods for the examination of water and wastewater, method 3500-Fe). In this method 1.00 ml of duplicate water samples are acidified, added to phenanthroline solution and diluted to 100.0 ml. The solution turns deep red and is measured at 510 nm. A series of standards from 0.50-2.00 ug/ml Iron(II) are prepared and their absorbance measured. The data for these solutions is given below. Using this data calculate the concentration of iron(II) in the original mine drainage samples.  

When reporting colony morphology from a MAC, all of the following are reportable characteristics except:

This organism may produce a weak positive catalase test and is PYR positive.

A catalase test is performed on a beta hemolytic Strep. The expected result would be:

Enterobacteriaceae is a single organism.

All of these are considered a hospital acquired infection, except:

Which method of antimicrobial susceptibility testing usings and antibiotic disk with a known concentration and has the zone size measured?

Which method of antimicrobial susceptibility testing usings an antibiotic strip with concentration gradients to determine the MIC?

What was your favorite topic or lab throughout MLS 334? 

An organism has been identified as gram positive cocci in chains. Which flow chart would be the most appropriate to use?