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POPSRaindrops on roses The team tried to replicate the effect.They put some polyvinyl alcohol onto rose petals and allowed it to set, then peeled off a thin plastic cast of the petal surface.This film had the same properties as the rose petal:the film could hold droplets of between 3-5 microlitres even when held upside down. It seems that the physical shape of the surface is much more important than any chemical properties of the material in creating 'stickiness',says Ronald Fearing, a biomimetic engineer at the University of California at Berkeley. For a rose, this stickiness might come in handy as reflective water drops that glisten in the Sun might attract pollinating insects. In the lab, such materials might be useful for 'lab on a chip' devices that need to hold and shunt around tiny quantities of liquid without leaking or being contaminated by nearby materials. "These findings present many interesting applications in microfluid handling," says Fearing.
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POPSDrink Water On Empty Stomach * Headache * Body Ache * Heart System * Arthritis * Fast Heart Beat * Epilepsy * Excess * Fatness * Bronchitis * Asthma * TB * Meningtitis * Kidney and Urine diseases * Vomiting gastritis * Diarrhea * Piles * Diabetes * Constipation * All Eye Diseases * Womb Cancer * Menstrual Disorders * Ear Nose * Throat Diseases
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POPSYour Doughnut Addiction Explained More: When sugar water was substituted for the saccharin solution, the results were the same, researchers said. "Intense sweetness is more rewarding to the rats than cocaine," said coauthor Magalie Lenoir of the University of Bordeaux in France. Lenoir said mammalian taste receptors evolved in an environment that lacked sugar and so were not adapted to the high concentrations of sweets found in the modern diet. Excess sugar could increase levels of the brain chemical dopamine, she said, leading to a craving for sweets.
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