Role of Mn²⁺ and Compatible Solutes in the Radiation Resistance of Thermophilic Bacteria and Archaea

Table 1

Concentrations of Mn and Fe in ultrafiltrates (UFs) and whole cells of thermophiles and radiation-sensitive bacteria.

		Conc. In:
			Ultrafiltrates			Whole cells
Organism	𝐷10^a	Genome	Mn	Fe	Mn/Fe	Mn	Fe	Mn/Fe
	(kG)	(Mbp)	(μM)	(μM)		(ng/10^9 cells)	(ng/10^9 cells)
P. putida ^b	0.1	6.2	0.9	6.1	0.1	18	1045	0.02
E. coli ^b	0.5	4.6	0.6	3.5	0.2	14	645	0.02
H. salinarum ^b	5	2.6	87	8.9	9.8	155	818	0.19
R. xylanophilus	6	3.2	79	8.2	9.6	549	290	1.9
R. radiotolerans	10	3.4	211	18	11.8	300	340	0.88
P. furiosus	3	1.9	5.3	113	0.1	14	345	0.04
T. gammatolerans	6	2.1	6.3	15	0.4	3	235	0.01

^aDose at which viable cells are reduced to 10% of the population.
^bFrom [11].