Biology & Microbiology
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Des bactéries qui ne perdent pas le Nord » Article » OwniSciences, Société, découvertes et culture scientifiqueCertaines bactéries aquatiques ont inventé et utilisé la boussole quelques millions d’années avant les Chinois.
Example of an approximately 40,000 probe spotted oligo microarray with enlarged inset to show detail.
The Micro- and Nanotechnology Research Group of the Universitat Politècnica de Catalunya (UPC) has produced silicon photovoltaic cells with a conversion efficiency of 20.5%, the highest level achieved in Spain using this material. This figure is comparable to results obtained by leading research groups in the field at the international level. The cells developed by the UPC researchers have surpassed the 15% barrier -- the average efficiency of the most common photovoltaic cells. Specifically, a conversion efficiency (of incident light to electric power) of 20.5% has been achieved, which means the energy produced per unit of area can be increased by one third. For example, thanks to the high efficiency of this new cell type, only 4.8 m² of photovoltaic panels would be needed to meet one family's annual energy needs (an average of about 4 kWh per day).
Last year’s artificial cell was created by J. Craig Venter and colleagues using a "top-down" approach: they replaced the genome of a bacterium, Mycoplasma genitallium , with a synthetic DNA sequence they designed to contain the minimum set of genes required for life. It was an amazing feat, but all of the machinery necessary to make the cell work was already present within the bacterial shell.
A folding ceramic <img src="http://cdn.physorg.com/newman/gfx/news/tmb/2013/afoldingcera.jpg" alt="" align="left" width="90" height="90"/> (Phys.org) —A sophisticated nanostructure renders a wafer-thin paper made of electrically conductive vanadium pentoxide fibres both tough and pliable. Nanotechnology / Nanomaterials Mar 28, 2013 | New type of solar structure cools buildings in full sunlight
DNA: How to unravel the tangle <img src="http://cdn.physorg.com/newman/gfx/news/tmb/2013/dnahowtounra.jpg" alt="" align="left" width="90" height="90"/> A research coordinated by the scientists at SISSA of Trieste has now developed and studied a numeric model of the chromosome that supports the experimental data and provides a hypothesis on the bundle's function. Biology / Cell & Microbiology Mar 29, 2013 |