Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.
Lionel Wilson, professor of earth and planetary sciences at Lancaster University, believes it is technically possible to place the reactors on the Moon by 2030 "given the commitment of enough money", and he highlights that there are already designs for small reactors.
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Manjit Sangha's heart stopped six times while in intensive care at New Cross Hospital in Wolverhampton.