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For centuries the legend of people's hair turning white with fear has persisted. Famously, Marie Antoinette's luxuriant strawberry-blonde locks were said to have turned blanc on the night before her execution. Now new research, published in the journal Nature, suggests extreme stress may indeed cause hair to lose its pigmentation. Experiments by a Harvard University team have shown that extreme levels of stress causes the sympathetic nervous system, which is responsible for the [...]

Brazilian and European researchers have demonstrated exactly how a nanotechnology-based compound delivers an oral vaccine against hepatitis B to the immune system. When particles containing silica and an antigen combine, even though they are different sizes, they reach the intestine without being destroyed by the acidity of the digestive system. A compound of nanostructured SBA-15 silica and HBsAg, the hepatitis B surface antigen, was submitted to different types of X-ray imaging in European [...]

A new technique for the decontamination of organs before transplantation using ultraviolet and red light irradiation has been developed by Brazilian and Canadian researchers and is described in an article published in the journal Nature Communications. The research is supported by São Paulo Research Foundation — FAPESP and has been partially conducted at the Optics and Photonics Research Center (CEPOF), hosted by the University of São Paulo (USP) at São Carlos in São Paulo State [...]