Although the researchers are not sure how bacteria detect airborne ammonia, they have some hypotheses about why bacteria produce slime in response to volatile ammonia.
He also speculates that slime could protect bacteria from high levels of toxic gas.
他同时猜测粘液能够保护细菌免受有毒气体的侵害。
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The experimenters tested whether they could replicate the slime gradient in other kinds of bacteria, including Bacillus subtilis, Micrococcus luteus and Escherichia coli.