It’s long been assumed that stone-tipped spears – the earliest examples of which appeared about 500,000 years ago – were a technological advance, but a new paper actually puts this theory to the test. Researchers used a cross-bow to fire wooden-tipped and stone-tipped spears into blocks of ballistics-grade gelatin. While both penetrated to a similar […]
Posts by Kelly Fram (KellyFram)
A fish out of water . . . can get used to it
A new study shows just how much a fish can change when raised in a land environment, and sheds light on the role such changes could have played in the evolution of land animals. Bichir (Polypterus senegalus) have both gills and lungs and, although they prefer water, can walk across land to reach new habitat […]
A healthy mind with a healthy heart
A new study confirms that exercise and healthy lifestyle maintains the elasticity of the arteries and is linked to preserved cognitive abilities later in life. Researchers performed MRI scans and physical tests on 31 young people (aged 18-30) and 54 older participants (aged 55-75) and while they found that age-related decline of cognitive functions and […]
Humans and pigeons gamble in similar ways
A new study shows that when it comes to gambling and taking risks, humans and pigeons have more in common than you might think. The study had pigeons and humans choose between different coloured options to receive a reward. Through experience they learned that some colours gave guaranteed rewards, while others gave risky (probabilistic) rewards, i.e. […]
Antidepressants during pregnancy may be linked to ADHD in kids
A new study finds that exposure to antidepressants in the womb may be linked to an increased risk of developing attention deficit hyperactivity disorder (ADHD). However, the researchers caution that the risks of depressed mothers-to-be stopping their medication may be greater for the unborn child than the increased risk of developing ADHD associated with continuing […]
Newfoundland fossil may be world’s oldest muscle
A 560 million-year-old fossil from Newoundland’s Bonavista Peninsula may record the oldest evidence of muscle tissue, according to a new paper. The fossil comes from a time known as the Ediacaran period, renowned for its preservation of the first large and complex organisms known. Most Ediacaran organisms were flat, sheet-like, or frond-like creatures whose […]
RNA research could lead to tailored prostate cancer treatment
New genetic research could help doctors predict which treatments will work best for a given prostate cancer patient. Researchers sequenced the RNA – molecules that tell them which genes are being expressed – from tumours in 25 prostate cancer patients. They then cross-referenced the RNA data detailed follow-up information, including reactions to different therapies. They […]
Marijuana legalization linked to lower overdose rates
U.S. states that implemented medical marijuana laws appear to have lower overdose death rates from prescription painkillers and drugs such as heroin, a new study shows. The authors examined ten states (Alaska, Colorado, Hawaii, Maine, Michigan, Montana, Nevada, New Mexico, Rhode Island, and Vermont) which enacted medical cannabis laws between 1999 and 2010 and compared […]
Hearths hazardous to heart health
Black carbon pollutants from wood-burning stoves and vehicle emissions are associated with elevated blood pressure in Chinese women, a new study shows. Black carbon is an air pollutant that comes from incomplete combustion of fossil fuels or wood; while it’s only one component of airborne dust, this is the first study to single it out […]
Toronto air pollution slowly getting better
Efforts to curb air pollution in Canada’s largest city are having an effect, although there’s still room for improvement, according to a new study. Researchers analysed data from provincial and federal monitoring programs and found that between 2004 and 2012, levels of both nitrogen oxides and volatile organic compounds (VOCs) decreased by about half. However, […]
Le premier vol, ou pourquoi les jeunes oiseaux migrent plus lentement
Une nouvelle étude montre que les jeunes oiseaux qui migrent pour la première fois sont plus lents que les adultes afin d’éviter la compétition avec ceux-ci. Des chercheurs ont utilisé des données de géolocalisation sur des grives des bois migrants du Bélize et du Costa Rica jusqu’au Canada. Ils ont trouvé que les jeunes oiseaux […]
Le volcan islandais Bardabunga pourrait entrer en éruption
Quatre ans après l’éruption du volcan islandais Eyjafjallajokull qui avait perturbé le trafic aérien en Europe pendant 6 jours, des chercheurs annoncent qu’un autre volcan, le Bardabunga, vient de se réveiller. Le 18 août, le Bureau météorologique islandais a relevé son niveau d’alerte à orange, ce qui signifie que l’activité volcanique est à un risque […]
Les saumons transgéniques se reproduisent aussi vite que les saumons sauvages
Les saumons transgéniques porteurs d’un gène d’hormone de croissance ne se reproduisent pas plus vite que les saumons sauvages, mais les transgéniques peuvent s’accoupler avec les sauvages. Ces saumons transgéniques contiennent un gène d’hormone de croissance de saumon quinnat associé à un gène antigel de loquette ce qui accélère leur croissance. Des chercheurs ont élevé […]
De la tuberculose et des phoques
Des chercheurs viennent de trouver la preuve que la tuberculose était présente en Amérique avant l’arrivée des Européens, et postulent que la maladie aurait atteint les rives du Nouveau-Monde grâce à des phoques et des otaries. Les auteurs de ce nouvel article ont séquencé le génome de trois souches de tuberculose trouvées sur des momies […]
MERS-CoV: les ouistitis tombent malades comme des humains
Des chercheurs ont trouvé que les ouistitis pourront servir de modèle animal afin d’étudier le coronavirus du syndrome respiratoire du Moyen-Orient (MERS-CoV). Ils ont observé que les ouistitis ont la même variété de protéine cellulaire de surface (DPP4) que les cellules humaines. Le MERS-CoV utilise cette protéine comme point d’ancrage avant d’envahir une cellule. Les […]
Le génome du canola décodé
Des chercheurs ont séquencé le génome de la plante qui donne l’huile de canola. Cette plante, Brassica napus, de la famille des choux et de la moutarde a été développé dans les années 1970 à Saskatoon par des chercheurs de l’Université du Manitoba, d’Agriculture et Agrolimentaire Canada et du Conseil national de recherches du Canada. […]
