Saturday, November 07, 2015
Increase In Earth's Temperature, Is This The Reason?
Saturday, October 10, 2015
That explains what was written in Mahabharata was indeed true
Wednesday, March 05, 2014
Off-grid electricity generation using animal power....is it possible?
As far as ethics are concerned, well, animals can be employed in batches to work and income generated can take care of these animals...however, exploitation lies in human nature, so that angle needs to be looked into as well...
Wednesday, September 18, 2013
We all know its sun's gravitational force that makes the planets to move in orbits.
Is there no influence of the hidden force of dark matter on planetary movement?
Tuesday, March 27, 2012
How universe got its magnetism?
Physicists attempt to solve it
PTI | Mar 26, 2012, 03.33PM IST
For long, it has been a mystery. Now, physicists claim to have attempted to solve it by using laser to create magnetic fields similar to those involved in formation of the first galaxies.
Magnetic fields exist throughout galactic and intergalactic space, what is puzzling is how they were created originally and how they became so strong.
A team, led by Oxford University, used a high-power laser to explode a rod of carbon, similar to pencil lead, in helium gas. The explosion was designed to mimic cauldron of plasma -- an ionised gas containing free electrons and positive ions -- out of which the first galaxies formed.
The physicists found that within a microsecond of the explosion strong electron currents and magnetic fields formed around a shock wave.
They took these results and scaled them through 22 orders-of-magnitude to find that their measurements matched the "magnetic seeds" predicted by theoretical studies of galaxy formation, the 'Nature' journal reported.
"Our experiment recreates what was happening in the early Universe and shows how galactic magnetic fields might have first appeared. It opens up the exciting prospect that we will be able to explore the physics of the cosmos, stretching back billions of years, in a laser laboratory here on Earth," said Dr Gianluca Gregori, who led the team.
The results closely match theories which predict that tiny magnetic fields -- "magnetic seeds" -- precede the formation of galaxies. These fields can be amplified by turbulent motions and can strongly affect the evolution of the galactic medium from its early stages.
Dr Gregori said in a release: "In the future, we plan to use the largest lasers in the world, such as the National Ignition Facility in California, to study the evolution of cosmic plasma."
Saturday, October 01, 2011
Cosmic 'umbilical cord' discovered
Posted on September 29, 2011 - 06:42 by Kate Taylor
Australian astronomers say they've found proof of a vast filament of material that connects our Milky Way galaxy to nearby clusters of galaxies and on to the rest of the universe.
The Australian National University team examined the positions of ancient groupings of stars called globular clusters, and found that they form a narrow plane around the Milky Way rather than being scattered across the sky.
And the Milky Way’s own entourage of small satellites also inhabits the same plane.
"What we have discovered is evidence for the cosmic thread that connects us to the vast expanse of the universe," says Dr Stefan Keller of the Research School of Astronomy and Astrophysics at ANU.
"The filament of star clusters and small galaxies around the Milky Way is like the umbilical cord that fed our galaxy during its youth."
Because of the Big Bang and the dominance of dark matter in the universe, he says, ordinary matter is driven, like foam on the crest of a wave, into vast interconnected sheets and filaments stretched over enormous cosmic voids – "much like the structure of a kitchen sponge."
"Unlike a sponge, however, gravity draws the material over these interconnecting filaments towards the largest lumps of matter, and our findings show that the globular clusters and satellite galaxies of the Milky Way trace this cosmic filament," he says.
Most globular clusters are the central cores of small galaxies that have been drawn along the filament by gravity. Once these small galaxies got too close to the Milky Way, the majority of stars were stripped away and added to our galaxy, leaving only their cores.
"It is thought that the Milky Way has grown to its current size by the consumption of hundreds of such smaller galaxies over cosmic time," says Keller.
Saturday, August 20, 2011
Scientists undo evolution to create chicken maniraptora snout
Rewinding evolution: Scientists alter chicken DNA to create embryo with 'alligator-like' snoutProcess could help detect birth defects in human children
By Daily Mail Reporter
Last updated at 3:24 PM on 19th August 2011
Scientists have undone the progress made by evolution by altering chicken DNA to create embryos with alligator-like snouts instead of beaks.
Experts changed the DNA of chicken embryos in the early stage of their development, enabling them to undo evolutionary progress and give the creatures snouts which are thought to have been lost in the cretaceous period millions of years ago.
The scientific revelation of 'rewinding' evolution could pave the way for scientists altering DNA in the other direction and use the same process to create species better able to adapt to Earth's climate.
It has also been claimed that the breakthrough could eventually help eliminate birth defects in human children.
Arkhat Abzhanov, an evolutionary biologist at Harvard University, developed the chickens with snouts by cutting a square hole in the shell of a chicken egg and dropping in a small gelatinous protein bead before watching the embryo develop.
The changes allowed separate molecules on the side of the face free to grow into snouts within 14 days.
Although ethical rules prevent the eggs from bring hatched, Dr Abzhanov said he hopes to complete the work one day by turning chickens into Maniraptora.
Dr Abzhanov made the changes by analysing the 'signalling molecules' which control the anatomical changes in birds and other animals.
Adding protein beads to the egg which stifle the development of certain molecules also prevents the birds from growing certain features.
Maniraptora are small dinosaurs which it is thought spawned thousands of species of birds which exist today.
Chickens and other birds are thought to have descended from dinosaurs through a series of genetic changes.
By altering the DNA of chickens to resemble alligator genes before the beak developed, Dr Abzhanov was able to change the evolutionary path of chickens so that they grew snouts instead.
Dr Abzhanov told the New Scientist: 'It looks exactly like a snout looks in an alligator [at this stage].'
Jack Horner, a leading paleontologist based at the University of Montana, is conducting similar work in an attempt to make a 'chickenosaurus' with a tail and hands similar to those of a dinosaur.
Craig Albertson, a developmental biologist at the University of Massachusetts in Amherst, said: 'Abzhanov's 'snouted' chicken provides a striking demonstration of just how easy it can be to provoke major evolutionary changes.'
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