feed info

44 articles from PhysOrg

NASA's Mars 2020 rover completes its first drive

NASA's next Mars rover has passed its first driving test. A preliminary assessment of its activities on Dec. 17, 2019, found that the rover checked all the necessary boxes as it rolled forward and backward and pirouetted in a clean room at NASA's Jet Propulsion Laboratory in Pasadena, California. The next time the Mars 2020 rover drives, it will be rolling over Martian soil.

Nanopores can identify the amino acids in proteins, the first step to sequencing

While DNA sequencing is a useful tool for determining what's going on in a cell or a person's body, it only tells part of the story. Protein sequencing could soon give researchers a wider window into a cell's workings. A new study demonstrates that nanopores can be used to identify all 20 amino acids in proteins, a major step toward protein sequencing.

The delicate water lily: A rose by another name?

A new study published in Nature reports the 409-megabase genome sequence of the blue-petal water lily (Nymphaea colorata). The conclusion of the 47 coauthors is that although a rose is a rose, most flowering plants may owe their success, including employing floral scent for attracting pollinators, in part to the genetic innovations observed in the delicate water lily.

Thawing permafrost affecting northern Alaska's land-to-ocean river flows

A new analysis of the changing character of runoff, river discharge and other hydrological cycle elements across the North Slope of Alaska reveals significant increases in the proportion of subsurface runoff and cold season discharge, changes the authors say are "consistent with warming and thawing permafrost."

Researchers crack Newton's elusive three-body problem

It's been nearly 350 years since Sir Isaac Newton outlined the laws of motion, claiming "For every action, there is an equal and opposite reaction." These laws laid the foundation to understand our solar system and, more broadly, to understand the relationship between a body of mass and the forces that act upon it. However, Newton's groundbreaking work also created a pickle that has baffled...

Perpetual predator-prey population cycles

How can predators coexist with their prey over long periods without the predators completely depleting the resource that keeps them alive? Experiments performed over a period of 10 years by researchers from McGill University and the Universities of Oldenburg and Potsdam have now confirmed that regular oscillations in predator-prey populations can persist over very long periods

Pair living as stepping stone from solitary life to complex societies: study

Alone, as a pair or in groups—the diversity in social systems of primates is interesting because it may also provide insights into human social life. An evolutionary biologist from the German Primate Center—Leibniz Institute for Primate Research, together with a colleague from the University of Texas at San Antonio, investigated how different primate societies evolved and which factors may be...

Grain traits traced to 'dark matter' of rice genome

Domesticated rice has fatter seed grains with higher starch content than its wild rice relatives—the result of many generations of preferential seed sorting and sowing. But even though rice was the first crop to be fully sequenced, scientists have only documented a few of the genetic changes that made rice into a staple food for more than half the world's population.

GISMO instrument maps inner Milky Way, sees cosmic 'candy cane'

A feature resembling a candy cane appears at the center of this colorful composite image of our Milky Way galaxy's central zone. But this is no cosmic confection. It spans 190 light-years and is one of a set of long, thin strands of ionized gas called filaments that emit radio waves.

Methane leak visible from space

Data from the Copernicus Sentinel-5P satellite revealed that an explosion in a natural gas well in Ohio in February 2018 released more than 50 000 tons of methane into the atmosphere. The blowout leaked more of this potent greenhouse gas in 20 days than the majority of many European nations do in a year from their oil and gas industries.

Paper-based test could diagnose Lyme disease at early stages

After a day hiking in the forest, the last thing a person wants to discover is a tick burrowing into their skin. Days after plucking off the bloodsucking insect, the hiker might develop a rash resembling a bull's-eye, a tell-tale sign of Lyme disease. Yet not everybody who contracts Lyme disease gets the rash. Now, researchers reporting in ACS Nano have devised a blood test that quickly and...