Radiation causes hidden DNA damage
Li-Jun Wu from Columbia University and colleagues from Colorado State University and the Chinese Academy of Sciences used the radiological research accelerator at Columbia to pass precise quantities o...
Physics solves blood vessel mystery
Experiments on the effect have been performed by introducing a compound called angiotensin II into the blood stream of a rat. This compound narrows the diameter of the blood vessels, which increases t...
Tiling theory could make DNA chips a reality
Previous attempts to use DNA as a molecular building block failed because its double helix structure is so flexible. However, Seeman and colleagues realized that if two synthetic DNA chains were place...
New clues to the left-handed origins of life
Fred Hoyle was the first to suggest that organic molecules developed in outer space and then fell to the earth, but it was not until the discovery of large quantities of left-handed amino acids in a m...
Physicists see the light in Nature
The brilliant colours in a butterfly’s wings, for example, are not produced by pigments alone. Instead a diffraction grating – a series of microscopic grooves on the surface of the wing &#...
Seeing light over contaminated soil
The device works by utilizing a small hydraulic ram attached on the back of a truck. When the vehicle is parked in the sample area, the ram fires a metal rod 30 m into the soil. At the top of the rod,...
Ground breaking physics in the garden
In Ammann’s scheme the plants are grown in a vertical structure with their roots protruding into a central column. A nozzle at the top of the structure sprays nutrients into this column, wetting...
Retinal TV
The growth of virtual reality has increased demand for more realistic video displays, but existing head-up display helmets are expensive and difficult to use. Gerard de Wit and Joseph Braat at Delft h...
Newsbytes: Galileo and aliens
Galileo declassified The Vatican has finally made public its archives, after four and a half centuries of secrecy. Scholars will be able to access files relating to figures such as Galileo, up to the ...
Irradiating eggs
A number of different radiation sources, such as gamma-rays and X-rays, have been used to pasteurize intact eggs. However, the high radiation dose needed to kill Salmonella and other bacteria leads to...
