Friday, April 23, 2010

Unraveling the physics of DNA's double helix

 The stability of DNA is so fundamental to life that it's important to understand all factors , said Piotr Marszalek, a professor of mechanical engineering and materials sciences at Duke.  If you want to create accurate models of DNA to study its interaction with proteins or drugs, for example,  you need to understand the basic physics of the molecule . For that, you need solid measurements of the forces that stabilize DNA .

DNA construction kit for nanoengines

For a rotaxane molecule consists essentially of an axle and a ring, or hoop, threaded over it. To prevent the hoop from slipping off the axle, bulky  stoppers  are placed at each end. These, in turn, consist of intertwined rings. The whole construction looks rather like a dumbbell with a hoop around its handle ( see diagram ).

Sunday, April 18, 2010

Laser technology provides a quantum leap (La tecnología láser da un salto cuántico)

En la Universidad de Innsbruck ( Austria ), un equipo de investigación financiado con fondos comunitarios ha creado un láser de átomo único que se rige por el mismo principio que los láseres clásicos pero que además presenta propiedades cuánticas en sus interacciones entre átomos y fotones. Los resultados de su investigación, publicados en la revista Nature Physics, ampliarán el conocimiento que se posee de las propiedades de los láseres y podrán utilizarse para medir composiciones de oligoelementos gaseosos e isótopos de carbono en el aire y el suelo.
At the University of Innsbruck ( Austria ), a team of private funded research has created a single atom laser which is governed by the same principle as lasers but also presents classical quantum properties in interactions between atoms and photons. The results of their research, published in the journal Nature Physics, expand the knowledge of the lasers properties and may be used to measure gas compositions of trace elements and isotopes of carbon in the air and soil.

Tuesday, April 6, 2010

La mayor tormenta solar en 500 días inquieta a los científicos

Una vez más, y esta vez con más fuerza y de forma totalmente inesperada, el Sol ha dado muestras de que ha despertado de su letargo. El telescopio espacial 'Tesis' registró el lunes la mayor tormenta geomagnética desde octubre de 2008, según informa el Instituto ruso de Física 'Lebedev'. La tormenta solar alcanzó el nivel 7 en una escala de 10, el máximo histórico del último año y medio. Su fase activa se prolongó de las 10.00 a las 19.00 horas. "No se han producido fluctuaciones de tal magnitud durante 540 días, desde el 11 de octubre de 2008", aseguran los técnicos. Una gran actividad solar no presagia nada bueno en un mundo absolutamente dependiente de la tecnología.
Once again, this time harder and quite unexpectedly, the Sun has shown that he has awakened from its slumber. The Hubble Space 'thesis' posted on Monday, the largest geomagnetic storm of October 2008, according to the Russian Institute of Physics 'Lebedev'. The solar storm reached level 7 on a scale of 10, the record high last year and a half. Active phase lasted from 10.00 to 19.00. "There have been no fluctuations of such magnitude for 540 days, from October 11, 2008", say the technicians. A high solar activity does not bode well in a world utterly dependent on technology.

Saturday, April 3, 2010

Viajar a la velocidad de la luz mataría en pocos segundos

Malas noticias para todos los que soñábamos con recorrer la galaxia a velocidades relativísticas. Según parece, al desplazarnos a velocidades cercanas a la de la luz, los escasos átomos de hidrógeno que existen en el espacio  vacío  nos golpearían tan duro como las partículas aceleradas por el Gran Colisionador de Hadrones ( LHC ). Si los científicos de la Universidad Johns Hopkins están en lo cierto,  esos pequeños átomos nos freirían en pocos segundos .
Bad news for all those who dreamed of exploring the galaxy at relativistic speeds. Apparently, the motion at speeds approaching that of light, the few hydrogen atoms that exist in the  vacuum  would hit us as hard as particles accelerated by the Large Hadron Collider ( LHC ). If scientists at Johns Hopkins University are right,  these little atoms will fry us in a few seconds .

Charging Ahead: Carbon Nanotubes Could Hold Long-Sought Battery Technology Breakthrough

With battery technology advances long overdue, researchers are racing to develop more efficient ways to store power. One hopeful option is in the use of carbon nanotubes,  which can store much more electricity by weight than lithium-ion batteries while keeping their charge and remain durable for far longer .