BBC Earth (Asia) - - Science -


Frogs, like all am­phib­ians, have thin, por­ous skin that they can breathe through. But this also poses a risk be­cause it makes it eas­ier for bac­te­ria to in­fect them.


To pro­tect them­selves, frogs se­crete sub­stances called cationic an­timi­cro­bial pep­tides (CAMPs). Other an­i­mals se­crete CAMPs too, but frogs pro­duce much more, in­clud­ing some pep­tides that are ef­fec­tive against mul­tire­sis­tant bac­te­ria.


Milk goes off be­cause of bac­te­ria, es­pe­cially species of Lac­to­bacilli and Pseu­domonas. These fer­ment the lac­tose in milk into lac­tic acid, and hy­drol­yse milk pro­teins into var­i­ous un­pleas­ant tast­ing by-prod­ucts.


Ac­cord­ing to Rus­sian folk­lore, putting a live frog in milk would help it stay fresh. Re­cent re­search has found that CAMPs from the Rus­sian brown frog could kill the bac­te­ria in milk and pre­vent it from turn­ing.

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