Il dubbio e il desiderio

Pubblicato il 28/03/2024

Tempo di lettura: 1 min

Botanica importante, ricercatrice e docente in un’epoca in cui alle donne scienziate era riservato uno spazio minimo e diffidente, ha vissuto una vita vivace e interessante tra la Sardegna, Cuba e la Liguria. Eva Mameli Calvino è stata anche la mamma del ben più celebre Italo, ma se è una donna meno raccontata di quanto si meriterebbe lo si deve al suo essere austera e riservata, mentre per anni è stata anche il punto di riferimento degli appassionati di giardinaggio. Eva Benelli ne discute con Silvia Bencivelli, autrice di Il dubbio e il desiderio. Eva Mameli Calvino.

prossimo articolo

Discovered a New Carbon-Carbon Chemical Bond

di Chiara D'Errico

Pubblicato il 16/10/2024

A group of researchers from Hokkaido University has provided the first experimental evidence of the existence of a new type of chemical bond: the single-electron covalent bond, theorized by Linus Pauling in 1931 but never verified until now. Using derivatives of hexaarylethane (HPE), the scientists were able to stabilize this unusual bond between two carbon atoms and study it with spectroscopic techniques and X-ray diffraction. This discovery opens new perspectives in understanding bond chemistry and could lead to the development of new materials with innovative applications.

In the cover image: study of the sigma bond with X-ray diffraction. Credits: Yusuke Ishigaki

Chemistry

After nearly a year of review, on September 25, a study was published in Nature that has sparked a lot of discussion, especially among chemists. A group of researchers from Hokkaido University synthesized a molecule that experimentally demonstrated the existence of a new type of chemical bond, something that does not happen very often.