Microbiomes of the dust particles collected from the International Space Station and Spacecraft Assembly Facilities

Table 3 Characteristics of dominant bacterial phyla as measured by Illumina iTag method during this study

	ISS HEPA total	ISS HEPA viable	ISS Debris total	ISS Debris viable	JPL-SAF total	JPL-SAF viable	JPL-103 total	JPL-103 viable
Total number of sequences	553,176	587,569	1,148,047	1,116,419	1,029,984	1,472,777	489,047	397,607
Percentage of sequences that belong to three dominant phyla	90.92	99.65	92.35	98.26	80.25	81.84	87.96	90.46
Actinobacteria
Percentage of sequences	63.28	95.28	40.52	66.54	28.76	25.25	23.79	21.46
Number of genera	78	55	62	38	122	116	103	71
Number of dominant genera (>100 sequences)	16	7	28	16	71	76	28	24
Firmicutes
Percentage of sequences	24.83	3.97	45.67	28.48	7.70	11.05	6.60	0.98
Number of genera	118	67	100	31	152	150	101	53
Number of dominant genera (>100 sequences)	50	17	65	18	53	69	15	7
Proteobacteria
Percentage of sequences	2.81	0.41	6.16	3.24	43.80	45.55	57.57	68.02
Number of genera	95	65	89	30	189	191	143	92
Number of dominant genera (>100 sequences)	22	7	49	10	96	104	56	29

ISSN: 2049-2618