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In some cases, alternative gelling agents might provide faster results. Researchers observed that bacterial cellulose and another bacterial polysaccharide, Eladium, allow a 50 percent increased growth rate for various bacteria and yeasts (as compared to their growth on agar), including higher biomass yields or faster detectable biofilm formation. However, both substances are still not as cheap and readily available as agar.

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"We are quite different people - very much yin and yang - but I think decisions are better made with two brains rather than one as it stops hubris," says Begg, who is London-based.

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