TABLE 2.

PLFA profiles of H. axialensis and H. hydrothermalis grown at 30°C under different salinity and hydrostatic pressure conditions

PLFA category and identitya	Total PLFA (%) at indicated pressureb
	H. axialensis		H. hydrothermalis
	4% total salts		4% total salts		11% total salts
	0.1 MPa (1)	45 MPa (2)	0.1 MPa (3)	45 MPa (4)	0.1 MPa (5)	45 MPa (6)
Terminally branched saturates
i15:0	0.0	0.4	0.1	0.0	0.0	0.0
i17:0	0.1	0.0	0.1	0.0	0.0	0.0
a17:0	0.2	0.3	0.3	0.3	0.3	0.4
Monoenoics
16:1ω9c	0.0	0.1	0.0	0.0	0.0	0.0
16:1ω7c	9.1	8.8	11.2	12.2	10.9	8.2
16:1ω7t	0.1	0.1	0.1	0.0	0.1	0.0
16:1ω5c	0.1	0.2	0.1	0.0	0.1	0.1
17:1ω6c	0.1	0.2	0.0	0.0	0.0	0.0
cy17:0	0.4	0.2	0.2	0.2	0.2	0.4
18:1ω9c	0.1	0.2	1.5	1.4	0.7	0.4
18:1ω7c	62.8	75.7	65.5	73.5	63.5	76.7
18:1ω7t	0.0	0.0	0.5	0.3	0.4	0.0
18:1ω5c	0.1	0.2	0.1	0.0	0.2	0.4
cy19:0	1.0	0.6	0.0	0.2	0.0	0.2
Normal saturates
14:0	0.4	0.2	0.3	0.0	0.3	0.0
15:0	0.2	0.2	0.2	0.0	0.2	0.0
16:0	24.1	11.8	17.5	10.3	21.1	10.3
17:0	0.6	0.5	1.0	0.7	0.9	0.9
18:0	0.5	0.4	1.0	0.9	1.0	2.0
20:1ω7c	0.1	0.1	0.0	0.0	0.0	0.2
Polyenoic
18:2ω6	0.0	0.0	0.1	0.0	0.1	0.0
Totals
Terminally branched saturates	0.4	0.8	0.6	0.3	0.3	0.4
Monoenoics	73.8	86.2	79.4	87.8	76.2	86.4
Normal saturates	25.8	13.1	20.0	11.9	23.4	13.2
Polyenoic	0.0	0.0	0.1	0.0	0.1	0.0

^aThe lipid a15:0 was not detected. No branched monoenoic or mid-chain branched lipids were detected.

^bCorresponding columns in Fig. 4 are noted in parentheses after the pressures.