Crystal-clear - The '2014 Most Superlative Crystal Growth Contest' for School Classes.

To celebrate the International Year of Crystallography among the general public, a consortium of chemists, physicists and crystallographers of the University of Geneva organised in Spring 2014 an incentive crystal growth contest for Geneva scholars aged 4 to 19. Starting from a kit containing a salt and user instructions, classes had to prepare a crystal that met specific criteria according to their category of age. The composition of the salt - potassium dihydrogen phosphate (KDP) - was only disclosed to the participants during the final Awards Ceremony. This contest positively exceeded our expectations with almost 100 participating classes (ca. 1800 participants) and 54 specimens received over all categories.

Assembly instructions to build your own attractive chemistry platform: experiences from the Chimiscope.

Taking into consideration the gap between the decreasing interest of teenagers for careers in science, and the ever-increasing need for top-ranked scientists and engineers to maintain wealthy economies, it has become of the utmost importance for governments and public institutions to devise new initiatives that bring attractive insights and fascination of modern science to the general audience and in particular to pupils. This paper is targeted toward academic institutions engaged in the process of building incentive programmes in the broad field of molecular science. It describes the step-by-step creation of the Chimiscope, the discovery and experimentation platform inaugurated in 2011 by the University of Geneva, which proposes captivation and take-home messages on the intriguing world of molecules to visitors aged 7 to 107.

Chimiscope: a multi-faceted laboratory platform for a unique journey into (bio) molecular science.

The University of Geneva, its Faculty of Science, and its School of Chemistry and Biochemistry have created the Chimiscope, a show to intrigue and to incite interest in the science of molecules and biomolecules. The Chimiscope will be inaugurated on the 24th November 2011.

Evidence for a dynamic cycle between Mn and Co in the water column of a stratified lake.

The geochemical behavior of Co in aquatic systems has often been related to the presence of Fe and Mn particles. A few studies have shown that Co is exclusively associated with particulate Mn, but the dynamics of Co and Mn cycling have never been determined in real time under natural conditions. In this study, we used a combination of analytical techniques to study the temporal and spatial evolution of Mn microparticles (MnOx) over 2 weeks in the water column of a shallow stratified lake (Paul Lake, MI). We report a temporal accumulation of dissolved Mn at the oxic-anoxic transition, and we show that this accumulation is due to the reductive dissolution of Mn particles. The reductant has not been identified, but abiotic reduction by sigmaH2S and ferrous iron is excluded because they are produced below the zone of MnOx reduction. Hybridization of RNA isolated from Paul Lake with oligonucleotide probes targeting the delta proteobacteria, which include metal-reducing species, suggests that their activity is greatest at and just below the oxic-anoxic transition, so that Mn reduction may be influenced by bacterial activity. Mn-oxidizing bacteria were isolated from this zone as well. We also demonstrate that the dynamic evolution of MnOx has a direct influence on the distribution of Co in the water column of this lake: dissolved Co is released during the reductive dissolution of MnOx and accumulates at the redox interface.