original_query: What were John Woodland Hastings' main contributions to the field of photobiology?
query: What were John Woodland Hastings' main contributions to the field of photobiology?
answer: John Woodland Hastings' main contributions to photobiology include pioneering research on bioluminescence in various organisms (bacteria, dinoflagellates, fireflies, etc.), elucidating the biochemical mechanisms of light production, discovering quorum sensing in bacteria, and leading the understanding of the molecular mechanisms of circadian rhythms.