After a two-decade hiatus, superconductors are again heating up.
A compound of hydrogen and sulfur, when crushed at more than a million times Earth’s standard atmospheric pressure, appears to whisk electrical current along without resistance at temperatures up to 203 kelvins. That’s not exactly balmy — it’s ?70° Celsius — but the current record holder performs its magic at temperatures no higher than 164 kelvins.
Whole genome duplications are common in plants, but a previous look at Norway spruce DNA found no evidence of such doubling (SN Online: 5/22/13). The new study examined the entire set of active genes, or the transcriptome, of 24 conifers and other seed plants and three distantly related plants.
Conifers grew giant genomes thanks to double doses of genetic material. Ancient ancestors of today’s pine, cypress and yew trees had extra copies of their entire genome, the set of genetic instructions for an organism, researchers report November 20 in Science Advances.
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