DIY Masks, Neanderthal Diet, Symbiotic Worms. April 3, 2020, Part 2

During the global COVID-19 pandemic, hospitals across the country are running low on PPE—personal protective equipment. This includes masks, gowns, face shields, and other important gear to keep healthcare workers safe. These supplies are the first line of defense between healthcare workers and potentially sick patients.

Cloth masks are usually only advised as a last resort for healthcare workers, but an increasing number of hospitals are seeking them out. Some hospitals, including Barnes-Jewish Hospital in St. Louis—the largest hospital in Missouri—are anticipating a tsunami of COVID-19 cases in the weeks ahead. To get ready, it’s watching and taking lessons from the experiences of hospitals in coronavirus hotspots, like New York City. One big example is turning to homemade cloth masks to fill oncoming PPE shortages.

A homegrown effort called the Million Masks Challenge has sprung up amidst the crisis. Volunteers are pulling out their sewing machines and extra fabric to make masks that are sent to healthcare providers. And a new website, GetPPE.org, has launched to connect crafters with hospitals across the country that are asking for homemade face masks.

Joining Ira to talk about the PPE crisis and how hospitals are preparing are Rob Poirier, clinical chief of emergency medicine at Barnes-Jewish Hospital and Jessica Choi, founder of GetPPE.org.

Why did Neanderthals disappear so quickly after the arrival of early modern humans in Europe, 40,000 years ago? Paleoanthropologists have long wondered whether it was some inferiority that allowed our ancestors to outcompete with Neanderthals for resources—whether that was intelligence, complexity, or some other measure of fitness. 

Over the last two decades, the image of the dumb, primitive Neanderthal has broken down. Researchers have found evidence of Neanderthal jewelry and art in European caves, as well as signs they may have buried their dead.

But the question remains: Why, when human ancestors finally made it to Europe, did Neanderthals vanish? One persisting theory is that getting Omega-3 fatty acids from diets rich in seafood enabled human ancestors to develop more advanced brains than their Neanderthal cousins. Stashes of fish bones and shells in South African caves have been taken as evidence that early modern humans ate from the sea—and until now, there’s been no evidence that Neanderthals in Europe also did so.

But, in a seaside cave in Portugal named Figueira Brava, researchers writing for the journal Science last month found a treasure trove of fish bones, mussel shells, and other remnants of dining from the sea—all older by tens of thousands of years than the first arrival of early modern humans in Europe. Lead author João Zilhão explains how this find expands the growing picture of Neanderthals as complex, intelligent hominins.

About 1,800 meters below the ocean surface off the western coast of Costa Rica, methane seeps dot the seafloor. These are places where methane and other hydrocarbons slowly escape from beneath the earth’s crust. Like more well-known hydrothermal vents, methane seeps are home to an unusual array of wildlife, relying on the seeps’ enriched chemistry for energy and nutrients.

Writing this week in the journal Science Advances, researchers describe two species of tube worms that live in a symbiotic relationship with methane-oxidizing bacteria that live on their crowns. The researchers collected some of the worms via deep-sea submersibles and then exposed them to carbon-13-labeled methane, showing that the worms were able to assimilate the methane into biomass. The team believes that the symbiosis allows these worms to rely on methane for much of their nutrition.

Shana Goffredi, an associate professor of biology at Occidental College in Los Angeles and one of the authors of the report, explains the research and what remains to be learned about the environment around these undersea methane seeps.

Writing this week in the journal Science Advances, researchers describe two species of tube worms that live in a symbiotic relationship with methane-oxidizing bacteria that live on their crowns. The researchers collected some of the worms via deep-sea submersibles and then exposed them to carbon-13-labeled methane, showing that the worms were able to assimilate the methane into biomass. The team believes that the symbiosis allows these worms to rely on methane for much of their nutrition.

Shana Goffredi, an associate professor of biology at Occidental College in Los Angeles and one of the authors of the report, explains the research and what remains to be learned about the environment around these undersea methane seeps.

 

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