Notes on Science in Flux

Penguins in Peril

More penguins are in peril from global warming. Scientists from the University of Washington report that members of the Magellanic penguin colony from Punta Tombo now have to swim 50 miles farther round-trip, to successfully forage for food -- while their mates sit on the eggs. Last month Proceedings for the National Advancement of Sciences reported on the endangered fate of the Emperor penguins. Remember the trials and tribulations in March of the Penguins that we wrote about in March On Penguins? Now it's even harder.

Interspecies Love

Scientists know that various forms of gene transfer occur between species, especially in prokaryotes like bacteria and certain eukaryotes like species in the plant genus Senecio. Native to Sicily, Senecio squalidus for instance, was introduced to the UK about 300 years ago. As the flower spread it, it pollinated with an indigenous flower and formed a second form of that British weed Senecio vulgaris (common groundsel). The alternate morphology of the groundsel had petals, making it look perhaps less "vulgaris" and more like a daisy drawn by a child.

Building previous research, scientists published a paper in Science last fall, which identified a cluster of genes transferred between Senecio species by introgressive hybridization. The cluster seemed to cause the petals in the second form of Senecio vulgaris, which gave plant a genetic leg-up because it could pollinate more easily. The weed could also then be used by humans in "Loves me, Loves me not" trials -- unclear whether that's an evolutionary advantage, to any species.

Other eukaryote species don't undergo such capricious genetic exchange although evolution seems always unpredictable. In a paper this week in Nature scientists from the University of Washington compared the genomes of macaques, orangutans, gorillas, and chimpanzees. Macaques split from the other three species about 25 million years ago. Building on previous work, scientists looking at the genome found "bursts of activity" that duplicated whole pieces of the genomes, 20,000 base sequences or more, at the same time that single gene changes were slowing down. The bursts of activity happened at key times, like before the chimps and humans diverged about ten million years ago. The duplications occurred where areas of previous duplications occurred, indicating that these areas rapidly evolve.

A court ruled that three patients whose children were autistic did not present enough evidence to convince the court that vaccines caused the illnesses. (Could you imagine the havoc is they had ruled the other way?) Despite the decision, parents will still be convinced that their children's autism was caused by vaccines. Or rain?.

Health Canada's Health Products and Food Branch and the FDA hosted a meeting of manufacturers and users of packaging materials to discuss strategies for understanding bisphenol A and reducing use of the chemical in consumer products. The FDA is scheduled to issue another round of BPA information on the safety of the chemical on February 24th. In the meantime, the city council of Chicago, in the US, is acting to restrict the chemical and has warned that if the FDA doesn't act by April 30th, it will. I'm sure certain chemical and toy associations are bearing down on Chicago as we speak.