11. The powder found in contaminated postal letters was composed of extracellular anthrax endospores . 12. This is the classic counterstain in both Gram stains, and endospore staining. 13. Perhaps the best known bacterial adaptation to stress is the formation of endospores . 14. When bacteria experience harsh conditions in the environment, they can form endospores . 15. Endospores for example, are highly resistant, and may be enough protection.16. The life stages of thalli, endospores , and sporangia have been observed. 17. This may be triggered by heating the endospore . 18. It is a sterilant, killing endospores in addition to many microorganisms and viruses. 19. "D . radiodurans " does not form endospores and is nonmotile. 20. Many Firmicutes produce endospores , which are resistant to desiccation and can survive extreme conditions.
