Table 1. Conditions for storage of air-dried B. subtilis spores^*.

Condition	Material additives	Amount of initial spores	Length of storage	Temperature (°C)	Atmospheric conditions
500 year desiccation	n.a.	106	2 years	20 ± 3	Ambient air
-80°C	n.a.	107	360 days	-80	Ambient air
Vacuum	n.a.	107	450 days	20 ± 3	10−7 Pa pressure
Controlled ambient air	n.a.	107	10 years	4	80% N2, 20% O2
Anoxic	n.a.	107	10 years	4	99.9% CO2
Simulated Mars regolith powder	47.7% Na-montmorillonite, 9.9% kaolinite, 21.3% hematite, 13.0% anhydrite, 7.1% MgSO4, 1.0% NaCl, 2.5% Na2O, 3.4% MgO, 14.1% Al2O3, 34.6% SiO2, 5.1% SO3, 0.2% Cl-, 0.2% K2O, 6.1% CaO, 0.1% TiO, and 18.5% FeO	107	10 years	4	Ambient air
Halite powder	99.5% NaCl	107	10 years	4	Ambient air

*Unless otherwise noted, storage was performed in ambient air, 40 + /- 5% relative humidity, and normal laboratory conditions.

n.a. is defined as not-applicable