Earth

Earth

Bacteria show new route to making oxygen

New discovery adds to the few known biological pathways for making and metabolically using the gas.

Chemistry

BPA found beached and at sea

Food chemists have been showing for years that bisphenol A, an estrogen-mimicking building block of polycarbonate plastics and food-can coatings, can leach into food and drinks. But other materials contain BPA – and leach it – such as certain resins used in nautical paint. And Katsuhiko Saido suspects those paints explain the high concentrations of BPA that he’s just found in beach sand and coastal seawater around the world.

Ecosystems

Athlete’s foot therapy tapped to treat bat-killing fungus

Over the past four years, a mysterious white-nose fungus has struck hibernating North American bats. Populations in affected caves and mines can experience death rates of more than 80 percent over a winter. In desperation, an informal interagency task force of scientists from state and federal agencies has just launched an experimental program to fight the plague. Their weapon: a drug ordinarily used to treat athlete’s foot.

Plants

Bees face ‘unprecedented’ pesticide exposures at home and afield

Honey bees are being hammered by some mysterious environmental plaque that has a name — colony collapse disorder – but no established cause. A two-year study now provides evidence indicting one likely group of suspects: pesticides. It found “unprecedented levels” of mite-killing chemicals and crop pesticides in hives across the United States and parts of Canada.

Paleontology

Fossilized poop bears tooth marks

Shark-bitten fecal matter probably came from an assault on an ancient croc.

Earth

Ice drilling nets shrimpy surprise

Underwater camera captures an Antarctic crustacean, as a serendipitous part of a larger ice shelf study.

Chemistry

Methane-making microbes thrive under the ice

Antarctica’s ice sheets could hide vast quantities of the greenhouse gas, churned out by a buried ecosystem.

Ecosystems

Iron fertilization in ocean nourishes toxic algae

Efforts to prevent global warming by fertilizing the oceans with iron could trigger harmful algal blooms.

Health & Medicine

For a lucky few, ‘dioxins’ might be heart healthy

Dioxins and their kin are notorious poisons. They work by turning on what many biologists had long assumed was a vestigial receptor with no natural beneficial role. But it now appears that in a small proportion of people, this receptor may confer heart benefits.

Climate

National academies to review IPCC procedures

Global science organizations asked to help evaluate processes that produced 2007 climate report.

Climate

Ancient Norse colonies hit bad climate times

Temperatures in Iceland plummeted soon after settlers arrived, a new chemical analysis suggests.

Earth

Green-ish pesticides bee-devil honey makers

Pesticides are agents designed to rid targeted portions of the human environment of undesirable critters – such as boll weevils, roaches or carpenter ants. They’re not supposed to harm beneficials. Like bees. Yet a new study from China finds that two widely used pyrethroid pesticides – chemicals that are rather “green” as bug killers go – can significantly impair the pollinators’ reproduction.