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Os semimetais na origem e evolução da vida
Aureliano, M.; Nolasco, Pedro A.; Silva, João J. R. Fraústo da; Silva, José Armando L.Metalloids in origin and evolution of life. Metalloids have characteristics between metals and non-metals which give them, in some cases, specific properties. At least two of this chemical elements, boron and silicon, are essential to a significant number of living organisms and since some years ago it has been observed that the same metalloids may be involved in the synthesis and stabilization of some molecule...
D-aminoácidos em biologia: mais do que se julga
Silva,João J. R. Fraústo da; Silva,José Armando L. daIt is still frequently referred, even in reference text-books, that the D-enantiomers of amino acids are not present in living organisms, which is not right. In the present revision/informative paper we describe a large number of D-amino acids that are present in all forms of organisms, from bacteria to human beings, in the free state, in peptides and in proteins, and give a short overview of their characterist...
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