Though bacteria are everywhere — from the air we breathe and the food we eat to our guts and skin — the vast majority are innocuous or even beneficial, and only a handful pose any threat to us. What distinguishes a welcome microbial guest from an unwanted intruder?
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How does life survive in the black depths of the ocean? At the surface, sunlight allows green plants to "fix"Â carbon from the air to build their bodies. Around hydrothermal vents deep in the ocean live communities of giant clams with no gut and no functional digestive system, depending on symbiotic bacteria to use energy locked up in hydrogen sulfide to replace sunlight.
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Lab tests of sugar and short-chain fatty acid combo point to new strategy to combat disease
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