Table III

Summary of Relative Biologic Count to Total Particle Number Obtained from the IMD-A Systems and Air Samplers

Instruments	S. epidermidis		E. coli		B. atrophaeus, spore
Instruments	Non-Stressed	Stressed	Non-Stressed	Stressed	Non-Stressed	Stressed
IMD-A 300	0.616	0.682	0.226	0.205	0.750	0.772
IMD-A 350	0.122	0.127	0.030	0.026	0.238	0.234
SAS	0.126	0.059	0.035	0.017	0.252	0.066
MAS	0.138	0.044	0.026	0.010	0.255	0.078
SMA	0.155	0.068	0.040	0.018	0.170	0.062

Values are the average of 12 replicates. In order to compare the results obtained independently from stressed or non-stressed bacterial experiments, the values were normalized by total particle number counted by LPC.