By WWII, scientists had already begun looking at alternative gelling substances for routine use in bacteriology, but concluded that agar was still better as it is both firmer and easier to handle. Today, some specialized microbiology applications use the colloid carrageenan (extracted from red seaweed Chondrus crispus, or “Irish Moss”), a more transparent and less auto-fluorescent alternative to agar (agar emits its own background fluorescence when excited by light). However, for routine bacteriological use, carrageenan is more difficult to dissolve, requires higher concentrations, can degrade at high temperatures, and forms weaker gels, which may result in puncturing its surface during the plating of cells.
For Carroll, when love is treated as fate, people become less willing to do the unshowy work that actually keeps love alive. Carroll says the soulmate trap makes it much harder when a relationship hits its first serious snag.
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Every Tuesday, Guardian rugby writer Robert Kitson gives his thoughts on the headlines, scrutinises the latest matches and provides gossip from behind the scenes in his unique and indomitable style. See the latest edition here.
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