单词	gramicidin
释义	gramicidin /ˌɡramɪˈsʌɪdɪn / noun [mass noun] Medicine An antibiotic with a wide range of activity, used in many medicinal preparations. This antibiotic is obtained from the bacterium Bacillus brevis. Her general practitioner had treated it unsuccessfully with neomycin and gramicidin ointment and oral flucloxacillin and metronidazole.... In fact, gramicidin is one of the first known antibiotics. These interesting properties have made gramicidin an appropriate model for studying solvent effects on the structural changes of peptides and proteins.
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