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

Table 2

Concentrations of amino acids, PO₄, and compatible solutes in thermophiles and radiation-sensitive bacteria UFs and thermophiles ethanol extracts.

	Conc. In:
	Ultrafiltrates (mM)						Ethanol extracts; (μmol/mg protein)
Organism	Amino Acids		PO4	Trehalose	MG	DIP	Trehalose	MG	DIP
	Free	Total
P. putida ^a	52	121	4.5	nd	nd	nd
E. coli ^a	80	181	5.9	nd	nd	nd
H. salinarum ^a	325	642	22	nd	nd	nd
R. xylanophilus	87	115	10	17	99	33	1.5	3.0	0.7
R. radiotolerans	134	159	24	29	64	—^b	1.7	2.4	nd
P. furiosus	15	35	5.4	nd	52	6	nd	0.2	0.04
T. gammatolerans	221	235	19	nd	10	2.3	nd	0.1	0.05

^aFrom [11].
^bNot detected.
nd: not determined.