Month: March 2004

Roland Piquepaille writes "Killing cells affected by cancer while leaving healthy ones alone is not a new idea (check here or there for example). But, in "Ultra-fast shocks scramble cells," Nature describes a new approach based on electrical nanopulses. These electric shocks last only a few billionths of a second while reaching during this very short amount of time power levels of terawatts. They also are very intriguing, apparently forcing cancer cells to commit suicide. For this reason, "there is plenty to be worked out before the human body is zapped with nanopulses." This overview contains more details and references. It also includes images showing how cells are affected by these electric nanopulses."

Roland Piquepaille writes "German researchers at the Max Planck Institute are using nanotechnology to take movies of cellular processes. They used Quantum Dots (or QDs) as nano-sized markers to visualize DNA sequences. This new approach is crucial for the development of new cancer drugs. "These Quantum Dots are nano-sized semiconductor crystals a mere ten millionth of a millimeter in diameter that fluoresce in several different colors upon excitation with a laser source. These crystals enabled the researchers to deliver real-time video-clips of signal transmission in the so-called erbB receptor family, important targets for many anti-tumor drugs such as antibodies directed against breast cancer." More details and references are available in this overview including some isolated shots from a movie showing live cells activation."

Roland Piquepaille writes "Do you want to know if the chicken you just bought at the supermarket contains bits of pork or beef? Or would you like to know if the vegetarian meal you just ordered contains some fish or meat? If your answer is yes, you might get some help from a DNA chip which can recognize 32 different species of fishes, birds and mammals, including humans(!!), in a single test. Both Small Times and New Scientist carry a story of this DNA chip, which will likely be used first by food regulators. The FoodExpert-ID biochip is the first high-throughput gene chip for testing food and animal feed. But it doesn't come cheap. The cost of all the equipment needed to perform the tests is around $250,000, but each test would cost only $350 to $550. This overview contains more details and references. It also includes illustrations showing how the technology works."