. 2015 Sep 3;29(2):230–240. doi: 10.5713/ajas.15.0188

Table 2.

Effects of different yeast species addition on in vitro gas production kinetics for rice straw

Item	Species	Dose (×10⁷ colony-forming unit)					SEM²	Significance (>p)³

		Mean ¹	0	0.25	0.50	0.75		Species	Dose	Species×dose
Vf (mL)	Candida utilis	53.23^f	58.46	53.12	50.31	51.05	2.564	<0.01	NS	<0.05
	Saccharomyces cerevisiae	61.68^e	58.46^b	69.13^a	60.30^b	58.82^b			Q (<0.05)
	Candida tropicalis	63.55^e	58.46	67.48	62.86	65.41			NS
	SEM ⁴	1.282
k (/h)	Candida utilis	0.101^ef	0.119^a	0.110^ab	0.100^ab	0.074^b	0.0122	NS	L (<0.05)	NS
	Saccharomyces cerevisiae	0.115^e	0.119	0.103	0.121	0.117			NS
	Candida tropicalis	0.093^f	0.119	0.078	0.099	0.077			NS
	SEM	0.0061
FRD₀ (/h)	Candida utilis	0.018^ef	0.013^b	0.014^b	0.020^ab	0.024^a	0.0023	<0.01	L (<0.05)	NS
	Saccharomyces cerevisiae	0.014^f	0.013	0.016	0.014	0.013			NS
	Candida tropicalis	0.020^e	0.013^b	0.021^a	0.021^a	0.025^a			L (<0.01)
	SEM	0.0011
t_0.5 (h)	Candida utilis	19.31	19.98^a	19.67^a	18.25^b	19.34^ab	0.412	NS	L (<0.05)	<0.05
	Saccharomyces cerevisiae	19.36	19.98	19.20	18.65	19.63			NS
	Candida tropicalis	19.07	19.98^a	20.07^a	17.97^b	18.26^b			L (<0.05)
	SEM	0.206

SEM, standard error of the mean; NS, not significant.

Mean for individual species across doses including the dose of 0.

SEM for strain×dose.

NS (p>0.05), L = linear effect of dose, Q = quadratic effect of dose.

⁴

SEM for pooled mean of species including the dose of 0.

^{a, b}

Means within a row for doses that do not have a common superscript differ (p<0.05).

^{e, f}

Means within a column for species that do not have a common superscript differ (p<0.05).