TABLE 1.

Calcium concentration in assay media from different manufacturers

Medium	Manufacturer	Trade name	Lot no.	Calcium concn in:
				Powder (% [wt/wt])	Prepared mediuma (mM)
SCDA	Difco	Tryptic Soy Agar	58057JD	0.134	1.34
			73273JF	0.162	1.63
			100020JB	0.127	1.27
	BBL	Trypticase Soy Agar	E8DFCF	0.068	0.68
			F8DFFV	0.021	0.21
			J9DHAT	0.039	0.39
	Oxoid	Tryptone Soya Agar	166 56368	0.036	0.36
			009 57341	0.073	0.73
			219 56605	0.051	0.51
	DAIGO	Soybean Casein Digest Agar	S105	0.122	1.22
			S109	0.136	1.37
			S121	0.165	1.65
SCDB	Difco	Tryptic Soy Broth	104075JB	0.030	0.22
			66933JB	0.032	0.24
			72198JC	0.032	0.24
	BBL	Trypticase Soy Broth	A8DENZ	0.031	0.23
			D8DFAZ	0.052	0.39
			G8DFHH	0.044	0.33
	Oxoid	Tryptone Soya Broth	018 57329	0.074	0.55
			073 55886	0.050	0.37
			188 56515	0.046	0.34
	DAIGO	Soybean Casein Digest Broth	S107	0.140	1.05
			S128	0.176	1.32
			S130	0.129	0.97

^aSCDA (40 g/liter) and SCDB (30 g/liter).