Table 1.

Specific growth rate (μ) and generation time (t_g) for the four microbial categories investigated.

Surface	Psychrophilic Bacteria		Mesophylic Bacteria		Fungi		Staphylococci
	μ (h−1)	tg (h)	μ (h−1)	tg (h)	μ (h−1)	tg (h)	μ (h−1)	tg (h)
Fine porcelain stoneware (LG)	0.013	54.9	0.025	27.5	0.210	3.3	0.033	21.0
Post-forming laminate (PFL)	0.049	14.2	0.028	24.5	0.211	3.2	0.023	30.2
Stainless steel (INOX)	0.041	17.0	0.056	12.3	0.200	3.4	0.030	23.3
Glass (G)	0.056	12.4	0.065	10.6	0.197	3.5	0.064	10.8
High-performing laminate (HPL)	0.040	17.2	0.035	19.8	0.216	3.2	0.044	15.7
Enamel steel (S)	0.021	33.0	0.026	26.3	0.191	3.6	0.030	22.8