Australasian Science: Australia's authority on science since 1938
James Cook University scientists have found that secretion of the stress hormone cortisol is impaired in young Indigenous adults, and that their biological stress response is linked to the racial discrimination they experience.
The study, published in Scientific Reports, showed for the first time that the morning increase of cortisol that prepares us to effectively deal with the stresses of the upcoming day is missing in otherwise healthy young Indigenous adults.
The origins of Vanuatu and Tonga’s first inhabitants has been revealed by the first major study of ancient DNA from the Pacific Islands.
The study, published in Nature (http://tinyurl.com/j79pr7t), found that Vanuatu’s first people arrived 3000 years ago from Taiwan and the northern Philippines, and not from the neighbouring Australo-Papuan populations of Australia, New Guinea and the Solomon Islands that had been in the region for between 40,000 and 50,000 years.
Australian researchers have uncovered the world’s oldest fossils in a remote area of Greenland, capturing the earliest history of the planet and demonstrating that life on Earth emerged rapidly in the planet’s early years.
Led by Prof Allen Nutman of The University of Wollongong, the team discovered 3.7-billion-year-old stromatolite fossils in the world’s oldest sedimentary rocks in the Isua Greenstone Belt along the edge of Greenland’s icecap.
A blood test developed by a team of scientists, including researchers from The University of Western Australia, can identify women who are at risk of having a premature birth but are not displaying symptoms, as early as 18 weeks as into their pregnancy. The breakthrough builds on previous work by the researchers who developed a similar test for women who presented to hospital with early contractions.
The test is the most accurate one to date and provides the earliest detection of premature birth, with a 86 per cent accuracy in determining mothers at risk of early delivery.
Popular wrist-worn fitness monitors underestimate energy expenditure with variances of more than 40 per cent, University of Queensland researchers have found.
Supervised by Professor Jeff Coombes of UQ’s School of Human Movement and Nutrition Sciences, PhD student Matthew Wallen and collaborators tested four common devices.
“We determined the accuracy of the Apple Watch, Fitbit Charge HR, Samsung Gear S and Mio Alpha,” Mr Wallen said.
“None of the devices proved to be consistently more accurate overall and the percentage error for energy expenditure was between nine and 43 per cent.
An international team of researchers has discovered the oldest fossil evidence of agriculture, not by humans, but by insects.
The team, led by James Cook University’s Associate Professor Eric Roberts, discovered the oldest known example of fungus gardens within fossil termite nests from the Great Rift Valley of Africa in 25 million year old sediments.
Fungus farming termite colonies cultivate fungi in gardens in subterranean nests or chambers, helping to convert plant material into a more easily digestible food source for the termites.
Fish have evolved the ability to live on land many times, challenging the perception that this extreme lifestyle shift was likely to have been a rare occurrence in ancient times, new UNSW Australia research shows.
“A fish out of water might seem an extraordinary thing, but in fact it is quite a common phenomenon,” says study first author and UNSW evolutionary ecologist Dr Terry Ord. “Amphibious behaviour has evolved repeatedly in a wide diversity of present day fish, and the move onto land does not appear to be as difficult as has been presumed.”
Research with CSIRO's Parkes telescope has discovered the first molecule in space that has a key attribute associated with life - 'handedness' or chirality.
The breakthrough is expected to help scientists solve one of the greatest mysteries in biology – the origin of homochirality - and offer insights into what we can expect from life throughout the universe.
The finding is being announced at a meeting of the American Astronomical Society today and will appear in the journal Science.
Like your two hands, many molecules can exist in forms that are mirror images of each other.