Showing posts with label Science. Show all posts
Showing posts with label Science. Show all posts

April 22, 2010

World Should Welcome Barack Obama’s Nuclear Push

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To hear Mr Obama’s critics, you would think precious little. For all its glitz, they say, this week’s huge summit was largely a restatement of policies that have been languishing because they are unenforceable. Likewise, the administration’s declaration that it would not unleash nukes on non-weapons states that lived by the rules of the Nuclear Non-Proliferation Treaty (NPT) was criticised either for being unwise (because it curtailed deterrence against biological and chemical weapons), or misleading (because it is so full of loopholes that it does not curtail deterrence much at all. And although the START treaty with Russia was good enough, all three events missed the main point: the threat of proliferation from hostile,unbiddable states like Iran.The world should welcome Barack Obama’s nuclear push—but it is only a start.

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April 18, 2010

Can You See 3D Movies Without Glasses ?

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The huge success of 3D movies like “Avatar”, “Clash of the Titans” and “Alice in Wonderland” has led scientists to explore possibilities of developing 3D technology that does not require glasses. Japanese companies supplying 3D technology and services to Hollywood production houses have said they hope to see their goods having an impact on people’s day-to-day lives within the next few years, and that further development in the technology will lower prices and makes the experience affordable for commoners, Xinhua reported.
However, before that happens, there are still a few problems that need to be solved. A ‘glasses-free’ 3D technology produced by a Japanese company has induced headaches, even if they were impressive.

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April 17, 2010

India's Cryogenic Engine GSLV-D3 Fails?

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"We have a long way to go and we will do that in the coming year", says ISRO chief Radhakrishnan
The non-ignition of the cryogenic engine on board the Geo-Synchronous Satellite Launch Vehicle (GSLV-D3) led to the failure of the mission on Thursday (April 15), the Indian Space Research Organisation (ISRO) has more or less concluded. “The cryogenic engine has not ignited, that is for sure. Why it has not ignited, the reasons have to be found out,” said S. Satish, ISRO spokesman, on Friday.
All the telemetry data had come in by 1 p.m. on Friday and the ISRO top-brass was studying them line by line. The GSLV-D3 is a three-stage rocket and it was flying with an indigenous cryogenic engine for the first time.

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April 12, 2010

India's Rising Temperature Affecting Everything !

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Scorching — that’s what Bangalore has become. Sunday’s maximum temperature of 37.6 degrees Celsius and minimum temperature of 24.2 degrees Celsius has been the highest in the past 25 years. The all-time maximum and minimum temperatures for April till date has been 38.3 degrees Celsius (April 30, 1931) and 14.4 degrees Celsius (April 26, 1894).

"The month of April always experiences extreme summer heat during day and night. The trend is likely to continue into May,"  
April 11, 1983 had also recorded a very close 37.7 degrees Celsius and this was the last recorded highest temperature in the past 25 years. 
In an ominous sign of climate change hitting home, India has seen accelerated warming in the past few decades and the temperature-rise pattern is now increasingly in line with global warming trends. 
The most up-to-date study of temperatures in India, from 1901 to 2007, has found that while it’s getting warmer across regions and seasons, night temperatures have been rising significantly in almost all parts of the country. 
The rise in night temperatures — 0.2 degrees Celsius per decade since 1970, according to the study — could have potentially adverse impact on yields of cereal crops like rice. The paper also finds that

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March 27, 2010

Pani-Pani Hai Hai !

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The World Bank last week released a report on the gamut of issues surrounding groundwater over-exploitation in India. While the report skirts the issue of pricing groundwater as politically sensitive and economically unsound, especially for backward rural consumers, we think charging groundwater use can act as a disincentive for its overuse and lead to conservation of one of our most threatened resources.
India is the largest groundwater user in the world, accounting for more than a quarter of the total global usage. Around 60% of irrigated agriculture and 85% of drinking water supplies rely on it. Yet, at least 29% of groundwater blocks in the country are under threat due to extensive overuse, according to a 2004 assessment.
That figure is likely to have increased considerably since then. Economic subsidies are the prime reason behind this overuse. Prolonged subsidies in the use of electricity has meant it is cheap to pump groundwater for agricultural and other purposes, and a poor public water delivery system has made groundwater use much more reliable. Added to this is a near complete regulatory gap on the construction of wells—it is estimated that there are at least 20 million well users now in India.
To be sure, putting a price on groundwater by removing electricity subsidies is a politically loaded issue that, given rampant vote bank politics, can make or break governments. Even assuming such a step is taken, the farmer who depends on groundwater will then need a reliable system of public water delivery and, more crucially, lesser controls on pricing agricultural produce to offset higher pumping costs and to ensure that output does not suffer. But the cavalier way in which farm produce is priced and the presence of strong farming lobbies mean this is unlikely to happen.
The problem, therefore, enmeshes issues of political interest, economic concerns, governance lapses and regulatory loopholes. Removing distortionary subsidies would be a start. But if we are to conserve groundwater, this will have to be complemented by local-level regulation and better delivery of water, not to mention targeted public investment in irrigation, something India has not seen for decades.

Source:Mint.

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March 25, 2010

Kya Medicine's Sabke Liye ?

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Unrestricted entry of foreign equity into the Indian pharmaceuticals sector is being questioned on three grounds, one serious and two non-serious. The least serious of the three comes from the National Security Council, which has proposed that the sector be put on the “sensitive” list, requiring prior scrutiny by the Foreign Investment Promotion Board. This is difficult to understand as there is no intellectual property to guard against foreign takeover, the Indian industry being entirely generic. The second non-serious reason, given by the department of pharmaceuticals, is that Indian firms are not on a level playing field — they do not have deep pockets to do the kind of R&D necessary for survival in a free-for-all which global firms do. But the key example cited in favour of this argumentis the takeover of Ranbaxy by Japanese firm Daiichi Sankyo, which happened not because Ranbaxy ran out of money to carry forward the vision of Parvinder Singh, but because his heirs wanted to cash out.
The department is on firmer ground when it fears that a growing tide of foreign takeovers can impact the pricing and availability of medicines in India. It is in India’s national interest to ensure that essential medicines are available...........

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March 16, 2010

Unconventional gas: May Turn Around !

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Natural gas is becoming less like oil and more like coal, which is a good thing !

 The three conventional forms of fossil carbon—oil, coal and gas—differ both in the way the Earth stores them and the way its people use them. Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel. Coal is found in many more places—a whole geological era’s worth of rocks, those of the Carboniferous, are named in its honour—and it cannot be pumped around, but can be crushed and burned and so produces baseload power. Gas, typically found and exploited in the same sort of places as oil, is easily moved around through plumbing but is not, usually, seen as a transportation fuel. It has filled niches in between: Europeans warm their homes with it and many developed countries generate some of their electricity with it.
Now new drilling technologies pioneered in America are allowing gas to be extracted from more types of rock—most notably shales, but also so-called “tight” sands and some coal formations—and thus from much more widespread sources. Other innovations, such as producing liquefied natural gas from offshore sources and shipping it to its destinations directly, and technologies that might allow exploitation of the natural gas that is frozen into some permafrosts, further increase the scope for new production. All told, this transition to more plentiful, diverse and widespread reserves in effect makes gas a bit more like coal, and a bit less like oil.
Coal, unlike oil, is hard to embargo: and an obvious consequence of the changes in gas production is that they make gas supply a less potent political tool. In Europe, where Russia has used supply cut-offs to put pressure on.........

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March 2, 2010

Erroneous Path for Rural Doctors:Anbumani Ramadoss

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The proposal put forward by the Central government to introduce a shortened medical course at the graduate level to serve the rural areas will only widen the rural-urban divide and impede India’s role as an emerging global power. In seeking to virtually revive the Licentiate Medical Practitioners (LMP) scheme that was available before Independence, the government has taken a regressive step. And in the process it is resorting to discrimination against rural folk, who are taken for second-grade citizens deserving medical care by a brigade of ‘qualified quacks’.
The scheme involves a three-and-a-half year course that leads to a bachelor’s degree in medicine and surgery. Doctors trained under this scheme will work in rural areas. They will be trained in district hospitals.
In the erstwhile LMP scheme, students were trained for around three years, awarded a diploma and asked to meet rural health care needs. It was considered a way to bridge the gap between demand and supply outside metropolitan India. The LMPs outnumbered the MBBS graduates and largely served in the rural areas. Following the Bhore Committee report of 1946, medical courses were unified into the standard five-and-a-half-year MBBS degree.
The issue is the impact of this scheme on the status of the rural Indian. In what way are rural Indians different from their urban counterparts? Do they deserve health care....

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February 21, 2010

OLED:Aakhir Hai Kya?

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Imagine having a high-definition TV that is 80 inches wide and less than a quarter-inch thick, consumes less power than most TVs on the market today and can be rolled up when you're not using it. What if you could have a "heads up" display in your car? How about a display monitor built into your clothing? These devices may be possible in the near future with the help of a technology called organic light-emitting diodes (OLEDs).
OLEDs are solid-state devices composed of thin films of organic molecules that create light with the application of electricity. OLEDs can provide brighter, crisper displays on electronic devices and use less power than conventional light-emitting diodes (LEDs) or liquid crystal displays (LCDs) used today.
­In this article, We will learn how­ OLED technology works, what types of OLEDs are possible, how OLEDs compare to other lighting techn­ologies and what problems OLEDs need to overcome.So,let us begin on new way of exploring new technology with simple and learned manner:

OLED Components:

Like an LED, an OLED is a solid-state semiconductor device that is 100 to 500 nanometers thick or about 200 times smaller than a human hair. OLEDs can have either two layers or three layers of organic material; in the latter design, the third layer helps transport electrons from the cathode to the emissive layer. In this article, we'll be focusing on the two-layer design.
An OLED consists of the following parts:
  • Substrate (clear plastic, glass, foil) - The substrate supports the OLED.
  • Anode (transparent) - The anode removes electrons (adds electron "holes") when a current flows through the device.
  • Organic layers - These layers are made of organic molecules or polymers.
    • Conducting layer - This layer is made of organic plastic molecules that transport "holes" from the anode. One conducting polymer used in OLEDs is polyaniline.
    • Emissive layer - This layer is made of organic plastic molecules (different ones from the conducting layer) that transport electrons from the cathode; this is where light is made. One polymer used in the emissive layer is polyfluorene.
  • Cathode (may or may not be transparent depending on the type of OLED) - The cathode injects electrons when a current flows through the device.

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February 4, 2010

A Legal Puzzle: Can a Baby Have Three Biological Parents?

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Scientists have created baby monkeys with a father and two mothers. Their goal was to eliminate birth defects, but increasing the number of biological parents beyond two could add a futuristic twist to an area where the law already is a mess: the question of who, in this age of artificial insemination and surrogacy, should be considered the legal parents of a baby.
Researchers at the Oregon National Primate Research Center were looking for ways to eliminate diseases that can be inherited through maternal DNA. They developed, as the magazine Nature reported last summer, a kind of swap in which defective DNA from the egg is removed and replaced with genetic material from another female’s egg. The researchers say the procedure is also likely to work on humans.
The result would be a baby with three biological parents — or “fractional parents,” as Adam Kolber, a professor at the University of San Diego School of Law, calls them.
He mentioned the idea over lunch at The Times, and it provided plenty of grist for debate among law junkies: Could a baby one day have 100 parents? Could anyone who contributes DNA claim visitation rights? How much DNA is enough? Can a child born outside the United States to foreigners who have DNA from an American citizen claim U.S. citizenship?
One reason these questions are so difficult to resolve definitively is that, even in simpler cases, the law of parenthood is badly muddled. That has been true since the 1980s saga of Baby M.
Mary Beth Whitehead had agreed to a payment of $10,000 to bear a child for William and Elizabeth Stern. The baby girl was conceived with Whitehead’s egg and Mr. Stern’s sperm. After the birth, Ms. Whitehead sued to keep the baby.
The New Jersey Supreme Court declared Ms. Whitehead “the legal mother” and “not to be penalized one iota because of the surrogate contract.” But it allowed the Sterns to raise the child.
In 1993, California came out the other way in a dispute between Crispina and Mark Calvert and a woman they had hired to carry a baby produced with their egg and sperm. All three courts that heard the case ruled for the Calverts, but each gave a different reason. The California Supreme Court finally decided that the person who intended to create the child and to raise it was the mother — in this case, Ms. Calvert.
There is confusion nationwide. Some states have laws expressly permitting surrogate parenthood; others make it illegal; and others have no law at all.
The problem, as Janet Dolgin, a Hofstra Law School professor, wrote in the Akron Law Review, is that legal thinking is deeply divided over how to judge what makes a family.
Since the 1960s, there has been a shift toward recognizing people’s intent in creating familial relationships, as reflected in the rise of no-fault divorce, prenuptial agreements and civil unions. But when it comes to deciding parenthood, courts remain deeply influenced by biology, even when it clashes with intent.
This concern is playing out now in A.G.R. v. D.R.H. & S.H., the biggest surrogacy case in New Jersey since Baby M’s. A woman served as a surrogate for her brother and his male spouse, giving birth to twins conceived with the spouse’s sperm and donor eggs. She signed a contract agreeing that her brother would adopt the children, but the trial court, saying it was following the Baby M decision, ruled that the spouse and the surrogate mother are the legal parents. The surrogate’s brother was given no parental rights.
When technology transforms a legal field — as the Internet is doing now for privacy, and digital music and video are doing for copyright — judges and legal thinkers have to decide what are the important values.
Parenthood cannot be reduced to a formula, but the law should move toward a greater recognition that the intent of the people involved is more important than the genes. That would provide useful guidance for courts to think about fractional parents — especially if the day comes when three or more people want to combine their DNA to create a baby.

Source:New York Times.

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February 3, 2010

About: Bt Brinjal

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Background:
  • Recently, India’s first experiment with commercial cultivation of genetically-modified (GM) vegetables has come one step closer to fruition when the Genetic Engineering Appraisal Committee (GEAC) cleared Btbrinjal for cultivation.
  • The decision still needs to be ratified by the environment minister before it becomes policy. (The final decision will come around march 2010) .The final decision to allow Bt Brinjal into the market is yet to be made.
  • At present India allows commercial cultivation of just one genetically modified crop: cotton. 
What are Genetically Modified (GM) foods?
  • Genetically modified (GM) foods are foods derived from genetically modified organisms. Genetically modified organisms have had specific changes introduced into their DNA by genetic engineering, unlike similar food organisms which have been modified from their wild ancestors through selective breeding (plant breeding and animal breeding) or mutation breeding.
  • GM foods were first put on the market in the early 1990s.
What is Bt?
  • Bacillus thuringiensis (or Bt) is a Gram-positive, soil-dwelling bacterium, commonly used as a pesticide.
  • B. thuringiensis also occurs naturally in the gut of caterpillars of various types of moths and butterflies, as well as on the dark surface of plants.
Advantages of Bt ?
  • The level of toxin expression can be very high thus delivering sufficient dosage to the pest.
  • The toxin expression is contained within the plant system and hence only those insects that feed on the crop perish.
  • The toxin expression can be modulated by using tissue-specific promoters, and replaces the use of synthetic pesticides in the environment.
  • The latter observation has been well documented worldwide.
What is Bt Brinjal?
  •  Bt Brinjal is a transgenic brinjal created out of inserting a gene [Cry 1Ac] from the soil bacterium Bacillus thuringiensis into Brinjal.
  • The insertion of the gene into the Brinjal cell in young cotyledons has been done through an Agrobacterium-mediated vector, along with other genes like promoters, markers etc.
  • This gives (so said) Brinjal plant resistance against lepidopteran insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
  • It is reported that upon ingestion of the Bt toxin by the insect, there would be disruption of digestive processes, ultimately resulting in the death of the insect.
Why it is Important Issue ?
  • The importance of this development can be understood from the fact that no GM Brinjal has been released for an advanced stage of field trials in open conditions anywhere in the world and that this is the first time that GEAC has given permission for large scale open trials for a food crop in India.
  • Our country has repeatedly proven itself incapable of regulating GM technology and has allowed contamination as a routine affair.
  • The proliferation of illegal Bt Cotton in the country is a good testimony to serious irreversible lapses that could happen at the trials stage.
  • A vegetable, more than other food items, goes through very little processing and is directly consumed through cooking and therefore requires great caution in decision-making.
Origin of Brinjal :
  • India is the Centre of Origin for Brinjal or Eggplant. Brinjal has been cultivated in India for the last 4000 years or so and has many historical references in various languages.
  • It is grown all over the country, year-round and is one of the most popular vegetables of India.
  • The area under cultivation is estimated to be around 5 lakh hectares. The total production stands at around 82 lakh metric tonnes. It is mainly grown in small plots as a cash crop by farmers.
  • The average yields of Brinjal in India are reported to be around 200 to 350 quintals per hectare. The main growing areas are in the states of Andhra Pradesh, Bihar, Karnataka, Maharashtra, Orissa, Tamil Nadu, Uttar Pradesh and West Bengal.
varieties of Brinjal:
  • There are many local varieties in India, in addition to improved varieties and hybrids. Some of the public sector improved varieties include Pusa Kranthi, Pusa Purple Cluster, Syamala etc.
  • Hybrids include Arka Navneet, Pusa Hybrid 6, Utkarsha, Pusa Hybrid 5 etc. from the public sector in addition to private sector hybrids.
Damage :
  • It is estimated that the damage caused by the Shoot & Fruit Borer in brinjal which has been the major pest for the past two decades ranges from 50 to 70% and in economic terms, it is estimated to be around $221 millions.
  • It is to lend tolerance to this pest primarily that the Bt Brinjal has been developed.
The Development of BT Brinjal:
  • Bt Brinjal is being developed in India by M/s Mahyco or Maharashtra Hybrid Seeds Company in collaboration with Monsanto.
  • The transformation work on Bt Brinjal started in Year 2000. Biosafety tests like pollen flow studies, acute oral toxicity etc., were taken up along with back-crossing programme from 2002.
  • After two years of greenhouse evaluation, in 2004, multi-locational field trials were conducted in 11 locations with five hybrids [Mahyco’s MHB-4 Bt Brinjal, MHB-9 Bt Brinjal, MHB-10 Bt Brinjal, MHB-80 Bt Brinjal and MHB-99 Bt Brinjal].
  • This was also the year when ICAR [Indian Council for Agricultural Research] took up trials with the same hybrids under the All India Coordinated Research Project on Vegetable Cultivation in 11 locations.
  • While the ICAR second year trials continued for these five hybrids in 2005, three more new hybrids were assessed by the company [MHB-11 Bt Brinjal, MHB-39 Bt Brinjal and MHB-112 Bt Brinjal] and ICAR in the same year in eleven centres.
  • Mahyco has sub-licensed the technology, as part of the USAID-supported, Cornell University-led ABSPII project [consortium of public and private sector institutions] to Tamil Nadu Agricultural University (TNAU), The University of Agricultural Sciences, Dharwad and The Indian Institute of Vegetable Research, Varanasi (IIVR).
  • This transfer of technology was apparently free-of-cost, with the public sector institutes allowed to develop, breed and distribute their own Bt Brinjal varieties on a cost-to-cost basis.
  • In addition to Mahyco, the National Research Center for Biotechnology at the Indian Agricultural Research Institute (IARI) is also experimenting with Bt Brinjal.
  • They developed a Bt eggplant using a Cry1Ab gene that is claimed to control 70 percent of the fruit borerattack. This institute had taken up agronomic trials in a controlled environment in 1998/99, 1999/2000, and 2000/2001. In 2003 they were permitted to conduct field trials in five locations - Delhi, Karnal, Pune, Tamil Nadu Agricultural University and the Indian Institute of Horticultural Research.
Poisitive Views: (of the company)
  • It is reported that the average shoot damage in Bt Brinjal hybrids ranged from 0.04% to 0.3% as compared to 0.12% to 2.5% in non-Bt Brinjal hybrids.
  • The percentage of damaged fruits reportedly ranged from 2.5% to 20% in Bt Brinjal to 24% to 58% in non-Bt counterparts
  • No significant difference was noted between Bt Brinjal and Non-Bt Brinjal, as per the company which did biosafety tests like acute oral toxicity, sub-chronic oral toxicity in rats, allergenecity of protein to rats, germination, weediness and aggressiveness tests, soil micro-biota studies etc.
  • This will help small and marginal farmers from having to use 25-80 sprays of pesticides which are ineffective, says the company
  • The company claims that human health concerns due to pesticide use can be addressed with this transgenic Brinjal with its in-built tolerance
  • Company promises that through this in-built tolerance, there would be substantial increase in marketable yields. Higher yields would result in higher incomes for farmers, it is expected.
  • The pricing of the seeds will be based on a cost-recovery model, making it affordable for all farmers, whether the seed comes from the private sector or the public sector, it is promised
  • Farmers will be able to continue to save and re-use their seed for the hybrids and varieties because of this arrangement, it is reported
Negative Views:
  • Several studies on Bt crops in particular and GM crops in general show that there are many potential health hazards in foods bio-engineered in this manner.
  • GM-fed animals in various studies have shown that there are problems with growth, organ development and damage, immune responsiveness and so on.
  • With Bt crops, a recent study from Madhya Pradesh in India shows adverse human health impacts in farm and factory workers with allergies caused by Bt Cotton.
  • Itching skin, eruptions on the body, swollen faces etc., were also reported, correlated with levels of exposure to Bt Cotton.
  • A study from Phillippines shows that people living next to Bt Corn crop fields had developed many mysterious symptoms, especially during pollination time.
  • It has also been shown from studies elsewhere that genes inserted into GM food survive digestive processes and are transferred into the human body. They are known to have transferred themselves into intestinal bacteria too.
  • Bt toxin had caused powerful immune responses and abnormal cell growth in mice. It has also been shown that all the Cry proteins in Bt crops have amino acid sequence similar to known allergens and are hence potential allergens.
Conclusion:
  • Widespread scepticism had greeted the first cultivation of Bt cotton. However it has been an unqualified success with yields multiplying many times over.
  • For vegetables—there are some 40 varieties in different stages of trials—the case for genetically-modified crops isn’t simply about higher yields. It is as much about developing varieties more resistant to pests, which destroy a significant proportion of vegetable crops at the moment.
  • Estimates suggest that Bt brinjal could add to the current annual production of 80 lakh tonnes by 50-70%—that’s as much destroyed by pests. It will be good for farmers and good for consumers.
  • Bt brinjal has been in various stages of trial for many years now. At least two years have been devoted to actual field trials in 11 select locations. No adverse effect has either been reported on the soil or in the consumption of Bt brinjal.
  • Some studies suggest that Bt Brinjal may be more environment friendly than regular brinjal.
  • Another concern often expressed about genetically-modified seeds is that the intellectual property is owned by multinational firms.
  • In the case of Bt brinjal, however, Indian research institutions have been very closely associated with the research—the Tamil Nadu Agriculture University and University of Agricultural Sciences, Dharwad. The seeds are being manufactured by the Maharashtra Hybrid Seed Company in collaboration with Monsanto.
  • Given the periodic scenario of high food prices and reports of supply crunches, India has little choice but to raise yields of key foodgrains and vegetables. There is much talk of another Green Revolution.
  • GM is one technology that can be used in the very near future to facilitate such a revolution.
  • Many other parts of the world are already leading us by some margin on the production of GM crops.
 Sources Briefing Paper on Bt Brinjal by Centre for Sustainable Agriculture Link, Wikipedia.

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January 15, 2010

Discovery of Largest ring :Saturn

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  • On 6 October 2009, the discovery was announced of a tenuous outer disk of material that is in the plane of Phoebe's orbit, which is tilted 27 degrees from Saturn's equatorial plane.
  • The ring is from 128 to 207 times the radius of Saturn, and is thought to originate from micrometeoroid impacts on Phoebe, which orbits at an average distance of 215 Saturn radii.
  • The ring material should thus share Phoebe's retrograde orbital motion, and after migrating inward would encounter Iapetus's leading face, which could explain the two-faced nature of this satellite.
  • NASA's Spitzer Space Telescope has discovered this enormous ring around Saturn which is the largest of the rings discovered so far.
  • It's bulk starts from 6 million kms and extends roughly to 12 million Kms. The ring is tenuous, made up of a thin array of ice and dust particles.
  • Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter.
  • Saturn, along with Jupiter, Uranus and Neptune, is classified as a gas giant.
  • Together, these four planets are sometimes referred to as the Jovian, meaning "Jupiter-like", planets.
  • Saturn has a prominent system of rings, consisting mostly of ice particles with a smaller amount of rocky debris and dust.
  • 61 known moons orbit the Saturn part from , not counting hundreds of "moonlets" within the rings.
  • Titan, Saturn's largest and the Solar System's second largest moon (after Jupiter's Ganymede), is larger than the planet Mercury and is the only moon in the Solar System to possess a significant atmosphere.
  • The planetary rings make Saturn the most visually remarkable object in the solar system.
  • They extend from 6 630 km to 120 700 km above Saturn's equator, average approximately 20 meters in thickness, and are composed of 93 percent water ice with a smattering of tholin impurities, and 7 percent amorphous carbon.
  • The particles that make up the rings range in size from specks of dust to the size of a small automobile. There are two main theories regarding the origin of Saturn's rings. One theory is that the rings are remnants of a destroyed moon of Saturn. The second theory is that the rings are left over from the original nebular material from which Saturn formed. 
     

     

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