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Children Science Congress begins with interactive dialogue of Prof. Yashpal

It was a real feast of knowledge for students as well as the audience at the inaugural ceremony of the Children Science Congress when Prof. Yashpal invited school students to the dais and explained the mystery of the sound of clapping

Science Congress is an Important Platform for Bringing

The Indian Science Congress is an annual session generally held from 3rd to 7th January among the scientists of different disciplines, science managers, policy makers and the general public to give a stronger impulse and a more systematic direction to the scientific inquiry, to promote the interaction of societies and individuals interested in science in different parts of the country and to obtain a more general attention to the objects of pure and applied sciences.

CHILDREN SCIENCE CONGRESS AT GUJARAT SCIENCE CITY

About 250 students from all over the country will participate in children science congress at the science city starting from January 3. The congress, a part of the Indian science congress, will be a unique event for children of Gujarat, to interact with the selected students from different parts of the country. The Children Science Congress is a part of the 92nd Indian Science Congress which is being held this year in Ahmedabad.

Tsunami: A new name in earthquake disaster !

For thousands of fisher folk, who had gone like every morning into the sea, it was again the same story - suddenly being caught in a phenomenon, tsunami, which struck India for the first time in recorded history.

New Tender Announced

TENDER DOCUMENT FOR
LIGHTING AND SOUND SYSTEMS FOR CULTURAL PERFORMANCES AT GLOBAL INVESTORS'
SUMMIT 2005
AT GUJARAT SCIENCE CITY, AHMEDABAD.

Winning the war against genetic diseases

ONE OF the potential benefits of Human Genome Project is in the field of gene therapy. Each of us carries about half a dozen defective genes. We remain blissfully unaware of this fact unless we, or one of our close relatives, are amongst the many millions who suffer from a genetic disease. About one in ten people has or will develop at some later stage, an inherited genetic disorder, and approximately 2,800 specific conditions are known to be caused by defects (mutations) in just one of the patient's genes. Some single gene disorders are quite common-cystic fibrosis is found in one out of every 2500 babies born in the Western World and in total, diseases that can be traced to single gene defects account for about 5 percent of all admissions to children's hospitals.
Most of us do not suffer any harmful effects from our defective genes be cause we carry two copies of nearly all genes, one derived from our mother and the other from our father. The only exceptions to this rule are the genes found on the male sex chromosomes. Males have one X and one Y chromosomes, the former from the mother and the latter from the father, so each cell has only one copy of the genes on these chromosomes. In the majority of cases, one normal gene is sufficient to avoid all the symptoms of diseases. If the potentially harmful gene is recessive, then its normal counterpart will carry out all the tasks assigned to both. Only if we inherit from our parents two copies of the same recessive gene will a disease develop.

Toxic wastes as fertilisers Poisoning or nourishing ?

Wastelands: The threat of toxic fertilisers," released recently by the national and state Public Interest Research Groups (PIRG) of the United States, reveals that a total of 22 toxic metals, including arsenic and lead , were found in the common fertilisers in the US. Fertiliser products become contaminated when manufacturers buy toxic wastes from industrial facilities to obtain low cost plant nutrients such as zinc or iron.


Human Genome Project A special Report

The complete set of instructions for making an organism is called its genome. It contains the master blueprint for all cellular structures and activities for the lifetime of the cell or organism. Found in every nucleus of a person's many trillions of cells, the human genome consists of tightly coiled threads of deoxyribonucleic acid (DNA) and associated protein molecules, organized into structures called chromosomes.
Some DNA details : If unwound and tied together, the strands of DNA would stretch more than 5 feet but would be only 50 trillionths of an inch wide. For each organism, the components of these slender threads encode all the information necessary for building and maintaining life, from simple bacteria to remarkably complex human beings. Understanding how DNA performs this function requires some knowledge of its structure and organization.


Drink water, keep heart healthy

Researchers at Loma Linda University in California found that people who drank at least five glasses of water each day were less likely to die from a heart attack than those who drank two or fewer glasses per day. In contrast, people who drank a lot of other fluids were more likely to die from heart attack than those who drank less, with high levels of non water drinking in women associated with a more than twofold increased risk of death

How sound becomes electric

SCIENTISTS FROM THE Centre for Hearing and Balance at Johns Hopkins have discovered how tiny cells in the inner ear change sound into an electrical signal the brain can understand.

Their finding, published in a recent issue of Nature Neuroscience, cound improve the design and programming of hearing aids and cochlear implants by filling in a 'black hole' in scientists understanding of how we hear, say the researchers.

"Sound itself is mechanical, a wave that moves, just like the ripples fanning out from a pebble dropped in a lake," says Paul Fuchs, professor of otolaryngology at the Johns Hopkins School of Medicine. "When the inner ear detects this wave, a burst a nerve sends an electrical signal to the brain that carries information about the original sound. But the nature of the chemical burst has been a mystery until now."


Vascular surgeon with a vision

Many of the serious illnesses, be it heart attack, stroke or problems, have their origin in blood vessels. But the surgeon who deals with the blood vessels, the lifeline of the human body, is the least known.
Dr. S.A. Hussain is not angry with this public ignorance or the unfavourable treatment the surgeons of vessels, called vascular surgeons, receive. Instead, he is on a campaign to sensitise people and to improve public health.


New asthma treatment

Three potent proteins of the immune system, evolved to purge us of intestinal parasites, now often launch misguided attacks in our airways, triggering the congestion of asthma that leaves millions gasping for air.
By studying the genetic machinery that controls production of these immune soldiers called cytokines, a team of scientists has demonstrated a potential strategy to silence their misfiring and quell the asthma response.

Mechanical heart moves ahead

A daring experiment testing a self- contained mechanical heart offers new hope for thousands with failing heart, many of whom may die while waiting for transplants.

First genetically altered babies born

The world's first genetically modified babies have been born after women unable to conceive naturally underwent a revolutionary new fertility treatment used by scientists at a New Jersey medical facility, a researcher said this week.


Low Cost Cholera Vaccine

Trials of a cholera vaccine manufactured in Vietnam at a cost of about only 20 US cents a dose have produced encouraging results, especially for children, an international team of researchers reports in the World Health Organisation's latest issue of The Bulletin. A team headed by Professor Dang Duc Trach at the National Institute of Hygiene and Epidemiology in Hanoi concluded that the vaccine was "safe and immunogenic" and "could elicit robust immune responses".


 
 

Tsunami: A new name in earthquake disaster !


J. N. Singh, IAS
Member Secretary
Gujarat Council of Science City

For thousands of fisher folk, who had gone like every morning into the sea, it was again the same story - suddenly being caught in a phenomenon, tsunami, which struck India for the first time in recorded history.

The country was still coming to grips with the nature and scale of the disaster. The waves have now claimed almost 4,000. And there's no news yet of 45,000 people in Nicobar and Greater Nicobar where a quake of 7.5 magnitude hit early on Sunday morning.

The trigger for the tsunami - a destructive wave train created by an undersea disturbance - was an 8.9 magnitude earthquake, just off the northern tip of Indonesia's Sumatra island.

Every year, disasters cause the death of a million people and leave several millions more homeless. Economic losses caused by natural disasters have tripled in the past 30 years. Working together continually as a community can help reduce the impact of disasters.


A hazard is a phenomenon or a process, either natural or human made, that can endanger a group of people, their belongings and their environment, if they do not take precautions.

There are different types of hazards. Some are natural while others are caused by human beings, such as so-called industrial or technological hazards (explosions, fires, toxic chemical spillages). Wars and terrorism are also hazards caused by human beings.


The feature describes the science of tsunami and its subsequent effects to our natural weather and climatic conditions.

What is a tsunami?

A tsunami (pronounced su-nah-me) is a wave train, or series of waves, generated in a body of water by an impulsive disturbance that vertically displaces the water column. Earthquakes, landslides, volcanic eruptions, explosions, and even the impact of cosmic bodies, such as meteorites, can generate tsunamis. Tsunamis can savagely attack coastlines, causing devastating property damage and loss of life. Tsunamis are large water waves, typically generated by seismic activity, that have historically caused significant damage to coastal communities throughout the world.

What does "tsunami" mean?


Tsunami is a Japanese word with the English translation, "harbor wave." Represented by two characters, the top character, "tsu," means harbor, while the bottom character, "nami," means "wave." In the past, tsunamis were sometimes referred to as "tidal waves" by the general public, and as "seismic sea waves" by the scientific community. The term "tidal wave" is a misnomer; although a tsunami's impact upon a coastline is dependent upon the tidal level at the time a tsunami strikes, tsunamis are unrelated to the tides.

How do tsunamis differ from other water waves?


Tsunamis are unlike wind-generated waves, which many of us may have observed on a local lake or at a coastal beach, in that they are characterized as shallow-water waves, with long periods and wavelengths. The wind-generated swell at Sumatra beach, for example, spawned by a storm out in the Indian ocean and rhythmically rolling in, one wave after another, might have a period of about 10 seconds and a wave length of 150 m. A tsunami, on the other hand, can have a wavelength in excess of 100 km and period on the order of one hour.

As a result of their long wavelengths, tsunamis behave as shallow-water waves. A wave becomes a shallow-water wave when the ratio between the water depth and its wave length gets very small. Shallow-water waves move at a speed that is equal to the square root of the product of the acceleration of gravity (9.8 m/s/s) and the water depth.


How do earthquakes generate tsunamis?


Tsunamis can be generated when the sea floor abruptly deforms and vertically displaces the overlying water. Tectonic earthquakes are a particular kind of earthquake that are associated with the earth's crustal deformation; when these earthquakes occur beneath the sea, the water above the deformed area is displaced from its equilibrium position. Waves are formed as the displaced water mass, which acts under the influence of gravity, attempts to regain its equilibrium. When large areas of the sea floor elevate or subside, a tsunami can be created. Large vertical movements of the earth's crust can occur at plate boundaries. Plates interact along these boundaries called faults. Around the margins of the Pacific Ocean, for example, denser oceanic plates slip under continental plates in a process known as subduction. Subduction earthquakes are particularly effective in generating tsunamis.

How do landslides, volcanic eruptions, and cosmic collisions generate tsunamis?


A tsunami can be generated by any disturbance that displaces a large water mass from its equilibrium position. In the case of earthquake-generated tsunamis, the water column is disturbed by the uplift or subsidence of the sea floor. Submarine landslides, which often accompany large earthquakes, as well as collapses of volcanic edifices, can also disturb the overlying water column as sediment and rock slump downslope and are redistributed across the sea floor. Similarly, a violent submarine volcanic eruption can create an impulsive force that uplifts the water column and generates a tsunami. Conversely, supermarine landslides and cosmic-body impacts disturb the water from above, as momentum from falling debris is transferred to the water into which the debris falls.

What happens when a tsunami encounters land?


As a tsunami approaches shore, we've learned in the "What happens to a tsunami as it approaches land?" Just like other water waves, tsunamis begin to lose energy as they rush onshore - part of the wave energy is reflected offshore, while the shoreward-propagating wave energy is dissipated through bottom friction and turbulence. Despite these losses, tsunamis still reach the coast with tremendous amounts of energy. Tsunamis have great erosional potential, stripping beaches of sand that may have taken years to accumulate and undermining trees and other coastal vegetation. Capable of inundating, or flooding, hundreds of meters inland past the typical high-water level, the fast-moving water associated with the inundating tsunami can crush homes and other coastal structures.

Earthquakes, floods, hurricanes, volcanic eruptions and landslides all these are natural phenomena that have occurred throughout the history of humankind. However, rapid population growth, environmental pollution and degradation, and increased poverty, have all contributed to turning these natural phenomena into disasters that cause enormous losses in human lives, infrastructure, and material belongings.

The Gujarat Science City working under the aegis of Department of Science and Technology, Govt of Gujarat is emerging as a large-scale science popularization platform in the country. The Gujarat Science City is developing a unique pavilion "Planet Earth" that aims to provide the educational community and children with an innovative and interactive tool for risk management.

The Planet Earth Pavilion in the Gujarat Science City is going to be a unique pavilion for educating the visitors about our own planet Earth and its rich biotic and abiotic resources, natural catastrophes and technological advances we can achieve sustainable development.

Shri Narendra Modi, Hon'ble Chief Minister of Gujarat performed the ground braking ceremony on 29th October 2004. The construction work has already been started and to be completed by January 2006. The Asian Development Bank has providing the financial assistance through the Gujarat State Disaster Management Authority (GSDMA) for the development of the above pavilion.

Reference: University of Washington's Department of Earth and Space Sciences

Fig 1: In the figure the waves are greatly exaggerated compared to water depth! In the open ocean, the waves are at most, several meters high spread over many tens to hundreds of kilometers in length.


Fig 2--Split: Within several minutes of the earthquake, the initial tsunami (Fig 1) is split into a tsunami that travels out to the
deep ocean (distant tsunami) and another tsunami that travels towards the nearby coast (local tsunami).


Fig 3--Amplification: Several things happen as the local tsunami travels over the continental slope. Most obvious is that the amplitude increases. In addition, the wavelength decreases. This results in steepening of the leading wave--an important control of wave runup at the coast.


Fig 4--Runup: As the tsunami wave travels from the deep-water, continental slope region to the near-shore region, tsunami runup occurs. Runup is a measurement of the height of the water onshore observed above a reference sea level.

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