Determination of Indoor Air Quality in Archives and Biodeterioration of the Documentary Heritage

Table 4

Prevalence of bacteria isolated on documents exhibiting different physiological characteristic.

Type of document	(CFU · cm^−2)
	TAB	AB	PB	Acidifying B	Sulphite RB  (𝐶𝑙𝑜𝑠𝑡𝑟𝑖𝑑𝑖𝑢𝑚 sp.)
M1	3.5 × 10^4	1.1 × 10^4	4.2 × 10^3	−	−
M2	7.1 × 10^5	3.0 × 10^4	3.0 × 10^5	−	−
M3	20	—	3	+	−
L1	2	—	—	−	−
F1	2.2 × 10^3	3.4 × 10^3	2.3 × 10^3	+	+
F2	3.0 × 10^4	1.0 × 10	3.7 × 10^4	−	−
F3	3.0 × 10^4	2.5 × 10^4	3.0 × 10^4	−	−
F3A	1.2 × 10^5	7.2 × 10^3	2.4 × 10^5	−	+
F4	3.9 × 10^4	—	1.6 × 10^4	−	+
P1a	1.3 × 10^3	—	20	+	−
P1b	4.0 × 10^2	3	3	+	−
P2	1.1 × 10^6	3 × 10^3	1.1 × 10^3	+	+

TAB: total aerobic bacteria determined on nutrient agar; AB: amylolytic bacteria determined on starch agar; PB: proteolytic bacteria determined on Frazier gelatin agar; Acidifying B: acidifying bacteria determined on broth for total acidifying bacteria; sulphite RB: sulphite reducing bacteria determined on reinforced Clostridium medium (DRCM).