TABLE 1.

Enumeration of SRB in a sediment slurry from Kysing Fjord with synthetic medium (API-RST medium) and sediment medium

Medium	Detection method	MPN · ml−1 on:
		Day 2	Day 5	Day 8	Day 11	Day 14	Day 34
Sediment medium	Tracera	2.3 × 101 (a)c	9.3 × 102 (a)	2.1 × 104 (a)	2.1 × 104 (a)	1.4 × 106 (a)	1.3 × 107 (a)
API-RST medium	Blackeningb	4.3 × 103 (b)	4.3 × 103 (a)	4.3 × 103 (a)	4.3 × 103 (a)	4.3 × 103 (b)	4.3 × 103 (b)

^aPositive tubes were detected by the ³⁵SO₄²⁻ T-MPN method, and the detection limit was 0.1% TRIS. 

^bPositive tubes were visually detected by the N-MPN method, i.e., by detection of a black precipitate (FeS). 

^cMPN values in the same column followed by the same letter are not significantly different as determined by the Student t test (P > 0.05).