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The investigation found a connection between exposure pesticides and the presence of symptoms of ADHD.
The study focused on 1,139 children from the general US population and measured pesticide levels in their urine. The authors conclude that exposure to organophosphate pesticides, at levels common among US children, may contribute to a diagnosis of ADHD.
“Previous studies have shown that exposure to some organophosphate compounds cause hyperactivity and cognitive deficits in animals,” says lead author Maryse F Bouchard. “Our study found that exposure to organophosphates in developing children might have effects on neural systems and could contribute to ADHD behaviours, such as inattention, hyperactivity, and impulsivity.”

Spider silk milked from goats may knit bones
Spider silk milked from goats may be used to replace body’s strained tendons, ligaments and bones in the future.
In a new experiment, Lewis and his team at the University of Wyoming successfully implanted the silk-making genes from a golden orb spider into a herd of goats. Spider silk has been used for centuries to dress wounds with varying degrees of success, but the problem has until now been how to get it.
“We needed a way to produce large quantities of the spider silk proteins,” said Lewis.
He added: “Spiders can’t be farmed, so that route is out and since they make six different silks, even that would not work if you could.”
Lewis and his team singled out the ‘dragline’ — the outer strand of the web — as the strongest of the six types of silk. They spliced the DNA that creates the silk into a female goat’s DNA, then waited for it to give birth and start lactating.
He said: “The splicing turned out to be relatively easy as there are known gene promotors that only produce expression in the mammary gland during lactation”. “Those were hooked up to our spider silk genes.”
After the milk is collected, it’s taken back to a laboratory where the silk protein is filtered out. It solidifies when exposed to air and is wound onto a roller.
Lewis said the team collects about four metres of silk for every four drops of protein they gather. The pure material had a wide range of medicinal applications as sutures and binding agents - including ligament replacement — but its use could extend well beyond our hospitals.

Sleep apnea ups insulin resistance
Researchers from the University of Pittsburgh Medical Centre claim that sleep apnea could cause metabolic changes that increase insulin resistance.
The intermittent hypoxia associated with sleep apnea causes a distinct drop in insulin sensitivity in mice, even though chronic hypoxia, such as that associated with high altitude, did not.
To determine whether intermittent hypoxia (IH) and chronic hypoxia (CH) would have different metabolic effects, Dr Lee and colleagues fitted adult male mice with arterial and venous catheters for continuous rapid blood monitoring of glucose and insulin sensitivity.
They then exposed the mice to either seven hours of IH, in which treatment, oxygen levels oscillated, reaching a low of about 5 per cent once a minute, or CH, in which they were exposed to oxygen at a constant rate of 10 per cent, and compared each treatment group to protocol-matched controls.

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