In a step that overturns traditional assumptions and practice, researchers at the Tata Institute of Fundamental Research, Mumbai and Institute for Plasma Research, Gandhi Nagar have fashioned bacteria to emit intense, hard x-ray radiation.
When one thinks of hard x-rays and bacteria it is usually that the bacteria are at the receiving end of the x-ray source - being imaged, irradiated for some modification or simply assessed for radiation damage.
One hardly thinks of using bacteria as a source of x-rays, far from turning them into the brightest among such sources.
The experiment consists of a femtosecond, infrared, high intensity laser irradiating a glass slide coated with E. coli bacterial cells, turning the cell material into a hot, dense plasma. Laser driven plasmas have been known to be very useful table top x-ray sources and efforts are constantly being made to improve their brightness.
One such effort, an important one, has been to create plasmas on a nanostructured surface where the nanostructure amplifies the incident intensity by electromagnetic local field enhancement.
The present advance has been made possible by the insight the researchers had when they realized that natural micro and nanostructures in the bacteria can be readily used for such intensity enhancement leading to hotter, brighter plasma.
They showed that the bacterial cells increased the x-ray flux by a factor of 100 in the 50 - 300 keV x-ray region . Further they grow the bacterial cells in a silver chloride solution whereby the silver atoms aggregated as nanoparticles inside the cell.
They could then use these bacteria spiked with nanoparticles to boost the emission another 100 times, leading to an overall enhancement of 10,000 times from the flux emitted by plain glass slides without the bacterial coating . This is the highest conversion of laser light to hard x-rays ever achieved.
This lateral stride could potentially lead to biologically inspired plasma physics and high energy density science with myriad applications among novel particle sources, creation of extreme excited states and related areas.
Contact M. Krishnamurthy (firstname.lastname@example.org) for more information.
 Enhanced x-ray emission from nano-particle doped bacteria, Krishnamurthy et.al., Opt. Exp. (2015); ibid Opt. Exp. 20, 5754-5761 (2012).
M Krishnamurthy | EurekAlert!
Barely scratching the surface: A new way to make robust membranes
13.12.2018 | DOE/Argonne National Laboratory
Topological material switched off and on for the first time
11.12.2018 | ARC Centre of Excellence in Future Low-Energy Electronics Technologies
The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.
Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
14.12.2018 | Power and Electrical Engineering
14.12.2018 | Physics and Astronomy
14.12.2018 | Physics and Astronomy