A numerical model estimates the  potential impact of environmental processes on contaminant fate of growth-promoting hormones used in beef production and leads the authors to believe they may persist in the environment at higher concentrations and for longer durations than previously thought - and they also believe their model illustrates potential weaknesses in the U.S. system of regulating hazardous substances, which focuses on individual compounds and but cannot always account for complex and sometimes surprising chemical reactions that occur in the environment

Researchers have discovered a gene, which they have named ICARUS1,  that enables plants to regulate their growth in different temperatures, and it could lead to new ways of optimizing plant growth in different climates.

The act of identifying a perpetrator is memory and involves thinking but it also constitutes a moral decision - because by identifying or not identifying someone, an eyewitness runs the risk of either implicating an innocent person or letting a guilty person go free.

In a recent article, Spring et al. discuss two studies in which children and adolescents of different ages watched a film involving a potential wrong-doing: throwing a lit birthday cake into a wastebasket, either with or without the intention of starting a fire and resulting in either no fire or a serious fire.

The filmed act is identical in all conditions; what is varied is the way the filmed act is 'framed' or described by a voice-over.

A new metal matrix composite that is so light that it can float on water, so a boat made of it would not sink despite damage to its structure - and this syntactic foam has good heat resistance too.

Syntactic foams have been around for many years but this is the first lightweight metal matrix syntactic foam, say the researchers from Deep Springs Technology (DST) and the New York University Polytechnic School of Engineering.

Their magnesium alloy matrix composite is reinforced with silicon carbide hollow particles and has a density of only 0.92 grams per cubic centimeter compared to 1.0 g/cc of water. Not only does it have a density lower than that of water, it is strong enough to withstand the rigorous conditions faced in the marine environment.

It's been known since the 16th century that neurons and blood vessels often traverse the body side by side but it was only more recently discovered that the growth of neuronal and vascular networks is controlled by the same molecules. 

“Most interesting is the interaction between neurons and blood vessels in the cerebral cortex. To date, we know very little about how neurons communicate with endothelial cells in order to structure a functional network in the brain.” explains Prof. Dr. Amparo Acker-Palmer, who plans to assess these processes in the layering of the cerebral cortex during embryonic development.

When ants go exploring in search of food they end up choosing collective routes that fit statistical distributions of probability, according to a team of mathematicians who analyzed the trails of a species of Argentine ant. 

It's unknown how flocks of birds, shoals of fish, lines of ants and other complex natural systems organize themselves so well when moving collectively so researchers from Spain and the U.S. analyzed the movements of Argentine ants (Linepithema humile, an invasive species in many parts of the world) while they forage or explore an empty space (a petri dish) and then they proposed a model explaining how they form their routes.