When autumn arrives to temperate climate forests, deciduous trees lose their characteristic green tonalities and start showing a wide spectrum of new colours: yellow, brown, orange, red… Chlorophyll reabsorption takes place in the leaves and carotenoids, present in a lower concentration, are exposed. These pigments are produced in all photosynthetic organisms, fungi and non-photosynthetic bacteria […]
Imagine a very simple chemical estructure: 4 carbon and 1 nitrogen forming a ring, with no double bonds, just simple bonds between any two of them and with hydrogen. This compound is called pyrrolidine and is the base of very important biological and farmacological products. Pyrrolidine is found naturally in the leaves of tobacco and […]
Biochemistry • Chemistry • Condensed matter • Molecular biology
Nanopore DNA sequencing was one the ten scientific breakthroughs of 2016 highlighted by Science magazine. In principle, graphene is the perfect pore material for DNA sequencing . Its monoatomic thickness of 0.35 nm is similar to the DNA base spacing and graphene nanopores can be fabricated with a diameter of only 1.0 nm, about the […]
Chemistry • Condensed matter • Materials • Physics • Quantum physics
Faster. That is the word that describes de evolution of electronics. Any new development has to be faster than anything before, if it is going to cope with the huge amount of information that the device where it may be incorporated will have to process in almost no time. Graphene has just demonstrated once again […]
Carbon has four valence electrons. To fill its octet, it requires four additional electrons, which can be obtained through the formation of four covalent bonds. Carbon forms single, double, and triple bonds to achieve a filled octet. As a result, carbon can have a tetrahedral, trigonal planar, or linear geometry, respectively. A unique feature of […]
Today is Monday morning and I am going to my laboratory in Niteroi by ferryboat. I took it from the XV Square of Rio de Janeiro. I am looking through the window of the ferryboat and I see one of the most beautiful pictures of the city – the Guanabara Bay (GB). Cariocas (people from […]
Enediynes are organic compounds containing two triple bonds and one double bond. The enediyne groups in those compounds are often called warheads. Why this name? Because, many of these compounds are capable of undergoing Bergman cyclization or, in other words, if heated they form a ring compound from a chain by formation of a new […]
Author: Carles Martí is a Ph.D. student (ITN-EJD-TCCM) at University of Perugia Nowadays, mostly everybody has heard about global warming, a problem that humanity faces and that can drastically change our climate in the upcoming years. This is caused by the, also well known, greenhouse effect, produced by the gases our modern society generates, to […]
Author: Giovanna D’Angelo is a Ph.D. student (ITN-EJD-TCCM) at Universitet Stockholm ”Where Do We Come From? What Are We? Where Are We Going?” is the title of a late XIX century famous painting by Paul Gauguin. Even if, to date, Science has not provided a complete answer to all these questions, we are still trying […]
What is the closest two beryllium atoms in the electronic ground state can be in a molecule? Well, we may think that that is a relatively easy question to answer. If you know some chemistry it is likely you will be inclined to check the literature for the strength of Be-Be bonds in different compounds […]