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Flipping through PubMed with a finger

di Emanuela Clavarino
Pubblicato il 30/12/2011Read time: 1 min

PubMed is a free database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez information retrieval system. PubMed was first released in January 1996.
As of 30 December 2011, PubMed has over 21.4 million records going back to 1966; about 500,000 new records are added each year. As of 1 December 2011, 12.3 million articles are listed with their abstracts, and 12.7 articles have links to full-text (of which 3.5 million articles are available full-text for free for any user).

PubMed On Tap enables you to search PubMed. The app keeps a history of past searches. Search results, including those with PDFs, can be emailed. In the pro version you can also configure an advanced search and avoid banner ads.

If you have any questions, you can write to [email protected]

Video tutorial and previews of the app:

pubmed 1 pubmed 4 pubmed 3 pubmed 2 


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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.