Alla fine di agosto, solo negli Stati Uniti, già 28 donne in gravidanza avevano perso la vita a causa della nuova influenza, e un centinaio aveva dovuto ricorrere alle cura di un'unità di terapia intensiva. I dati, comunicati ieri da Anne Schuchat, direttore del National Center for Immunization and Respiratory Diseases dei Centers for Disease Control and Prevention di Atlanta, non possono lasciare indifferenti. Alla luce dell'impatto del virus H1N1 in questa categoria ad alto rischio, è poco chiara la decisione del vice ministro italiano Ferruccio Fazio di restringere l'uso degli antivirali nelle future mamme: le ultime indicazioni che vengono dalle autorità italiane, infatti, suggeriscono l'uso dei farmaci solo nelle donne già portatrici di patologie croniche preesistenti alla gravidanza.
Mamme a rischio?
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Discovered a New Carbon-Carbon Chemical Bond
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
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.