The Sun's outer layers form the corona, and are heated to millions of degrees by a continual input of energy from the surface, where magnetic fields twist and reconnect. In a hail of millions of solar micro-flares per day, magnetic energy from these constant 'short circuits' is pumped into accelerating protons and electrons to high energy, and these then diffuse into the corona to heat it. The solar wind consists of the flow of particles from the Sun at speeds of 300-400 kilometers/sec. By the time this wind reaches the orbit of the Earth, its density is only about 5 particles (mostly hydrogen and helium nuclei) per cubic centimeter. The Sun loses about 1/100 trillionth of its mass ' every year from this wind- Other stars have much heftier winds that cause the star to lose 1/100,000 of its mass each year. High-speed wind streams arise from coronal holes. These more...

Researchers in Chicago have now built a half-living, half-robot creature, Astounding as it may sound, the breakthrough is not so much about building man-machines as. it is about investigating the way the human brain functions The experiment connects the brain of on eel- like fish to a computer and forms a closed system between the two entities — one living, the other mechanical. The robot's sensor detects when a tight is switched on and sends signals to the animal's brain which in turn returns Impulses Instruct mg the robot (and the animal attached to if) to move towards the light, In effect, the scientists have been able to infiltrate into an organism's mind. ' The exciting field of neural engineering, as the name suggests, looks at the billions of nerves that make up the human body as parts of on incredibly complex machine. With the advent of nano-technology (which Is more...

If state-run educational institutions I across India hove become a tragic travesty, many privately-owned teaching shops mushroomed to fill the lacunae of learning ore no better. In fact, the latter exploit more by charging exorbitant fees. Badly shaken by the ever Increasing criticism of tutorial Institutes as schools for scandal, the Maharashtra Govt. is trying to regularise the coaching institutes run in overcrowded cubicles or cramped classrooms. In the past these hove been embroiled in countless controversies about leaked papers, rigged examinations and misleading publicity. A recent rule that college teachers cannot simultaneously be attached to colleges and coaching institutes has flopped due  to lack of implementation. Those caught playing a double role decided to leave the cash-starved colleges for the ignoble but more lucrative option. The recent ordinance that insists that coaching institutes register themselves, also enforces 19 conditions including a strict fee structure. This has made coaching class more...

The sultan of 20th century science fiction, Arthur C Clarke, said that the only way to discover the limits of the possible is to venture beyond into the impossible. At the start of the new millennium, advances in scientific research and technology have so completely overtaken our lives that it has become impossible to fathom what else we might see and experience in our own lifetimes. Incredible journeys now extend beyond mere geography; biologically, we hove jouneyed for inside our own bodies. Biotechnology has undergone a complete transformation -from a dull, laboratory science to a vibrant and pioneering branch of science. Some of the newly evolved bio-techniques like in vitro fertilisation and genetic engineering, exotransplantation and cloning seem straight out of bizarre science fiction and hold out unimaginable future possiblities. In Japan, scientists have now 'constructed' spermatozoa in a laboratory test-tube, the draft map of the human genome was completed more...

The completion of the human genome a map of man's genetic constitution marks a scientific milestone which will transform biology from being a descriptive science to a predictive one. The recent rapid strides in genetic engineering and and biosciences hove always suggested that the day was not for off when biologists would start enumerating the genetic alphabets, And now that day Is finally here with scientists putting together o sort of periodic table of life from which one con look up the complete list and structure of all genes. No longer is it necessary for a biology student or a post-doctoral fellow to toil for months, frying to isolate genes; one can now easily look up with information on the internet. Currently the complete genome sequence of over 60 species are available. Each cell contains the genetic code in the bundles coiled chromosomes. The letters of the code As, Cs, more...


Archive


You need to login to perform this action.
You will be redirected in 3 sec spinner

Free
Videos