TABLE 6.

Effects of MMM media compositions on hydrogen sulfide formation^a

Strain genotype	Effect of:
	N at 433 mg/liter	N at 123 mg/liter	N at 65 mg/liter	N at 65 mg/liter plus 1/2 YNB	N at 123 mg/liter plus 1/5 YNB
met17Δ	+	+	+	+	+
cys4Δ	+	+	+	+	+
gos1Δ	+	+	+	+	+
fcy22Δ	+	+	+	+	+
tpo2Δ	+	+	+	+	+
hom2Δ	+	+	+	+	+
hom6Δ	+	+	+	+	+
atp11Δ	+	+	0	0	+
ser33Δ	+	+	0	0	+
hht2Δ	+	0	0	+	tr
rxt2Δ	+	0	0	+	tr
iki3Δ	0	0	0	+	0
ypl035CΔ	0	0	0	tr	0
sit4Δ	tr	0	0	+	0
psy4Δ	0	tr	0	+	+
cgr1Δ	+	0	0	+	+

^aH₂S production was evaluated with lead acetate strips: +, a detectable amount of H₂S was produced; 0, H₂S was not detected; tr, very light color change indicating trace amounts of sulfide formation. The data represent the findings of at least two independent replicates.