BMC Ecology and Evolution

Table 3 Distribution of biological properties in DXR-II and non-DXR-II containing bacterial strains and statistical tests of enrichment

From: Evolutionary diversification and characterization of the eubacterial gene family encoding DXR type II, an alternative isoprenoid biosynthetic enzyme

Biological properties		Number of strains		p-value
Biological properties		DXR-II	Non-DXR-II	p-value
Habitat		41	1166
	Host-associated	18	383	0.36
	Multiple	16	330	0.33
	Specialized	3	148	ND
	Terrestrial	2	94	ND
	Aquatic	2	211	ND
Oxygen Req		39	1137
	Facultative	15	404	0.76
	Aerobic	15	413	0.88
	Anaerobic	9	284	ND
Salinity		7	245
	Non-halophilic	6	171	ND
	Moderate halophilic	1	30	ND
Temp. range		38	1202
	Mesophilic	36	1013	0.64
	Thermophilic	2	107	ND
Optimal temp. ^a		38.61 (18)	41.21 (555)	0.27
Genome Size ^a		3.73 (48)	3.59 (1456)	0.50
GC Content ^a		48.23 (45)	48.63 (1193)	0.84
Shape		43	1239
	Rod	29	794	0.90
	Coccobacillus	6	21	ND
	Coccus	5	188	ND
	Filament	2	20	ND
	Short rod	1	2	ND
Arrangment		35	899
	Singles	17	501	0.77
	Pairs	9	209	ND
	Chains	4	107	ND
	Groups	3	3	ND
	Filaments	2	22	ND
Endospores		18	626
	Yes	6	121	ND
	No	12	505	0.71
Motility		27	947
	Yes	22	579	0.37
	No	5	365	ND
Gram Stain		39	1050
	-	22	704	0.60
	+	17	344	0.35
Pathogenic in		42	1008
	Animal	15	181	0.04
	Human	14	264	0.50
	No	13	521	0.11

P-values resulting from Fisher’s exact tests are shown for categories represented in at least 10 bacterial strains. Test significant at p < 0.05 is shown in bold type. ^a, for these quantitative properties, the average value (number of strains is shown between parentheses) and p-values resulting from Student’s T tests performed to assess significance of the differences between means are shown.

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