Giant Magnetic Susceptibility in Fe and Co Epitaxial Films

The static magnetic susceptibility of subnanometer thick Co and Fe films at the Curie temperature is enhanced by four orders of magnitude with respect to bulk samples

Interactions between π-conjugated chromophores in a giant molecular spoked wheel

We discuss the intriguing photophysics of a giant molecular spoked wheel of pi-conjugated arylene-alkynylene chromophores on the single-molecule level. This "molecular mesoscopic'' structure, C1878H2682, shows fast switching between the 12 identical chromophores since the fluorescence is unpolarised but only one chromophore emits at a time

Amido resistente e suas propriedades físico-químicas Resistant starch and its physicochemical properties

A partir da década de 80, começou a ser observado que uma fração do amido escapava da digestão no intestino delgado e chegava ao cólon, onde servia de substrato para a flora bacteriana. Essa fração foi denominada amido resistente e, a partir de então, constatou-se que determinados efeitos fisiológicos, inicialmente atribuídos às fibras alimentares, poderiam também ser atribuídos ao amido resistente. Vários fatores podem estar envolvidos na sua formação e eles, por sua vez, afetam a sua resposta fisiológica. Deste modo, torna-se importante o conhecimento dos aspectos físico-químicos envolvidos na formação do amido resistente.<br>Since the 1980s, it has been observed that a starch fraction was not digested in the small intestine, reaching the colon as a substrate for the bacterial flora. This fraction was called resistant starch and, from this time on, it was noticed that certain physiological effects, initially attributed to the dietary fiber, could also be attributed to the resistant starch. Several factors can be involved in its formation, and they, in turn, affect its physiological response. Therefore, the knowledge on the physicochemical aspects involved in the formation of the resistant starch becomes important