Sci-tech
Plastic
Bags made from Orange Peels and CO2
A
team of researchers from the Cornell University hope to kill
two birds with one stone after they have developed a plastic
bag which is made out of orange peels and CO2, which makes
it both biodegradable and renewable at the same time. The
scientists describe a way to make polymers using limonene
oxide, which is found in citrus fruits and carbon dioxide,
with the help of a novel "helper molecule," a catalyst
developed in the researchers' laboratory. "Almost every
plastic out there, from the polyester in clothing to the plastics
used for food packaging and electronics, goes back to the
use of petroleum as a building block," the researchers
wrote in their study. "If you can get away from using
oil and instead use readily abundant, renewable and cheap
resources, then that's something we need to investigate. What's
exciting about this work is that from completely renewable
resources, we were able to make a plastic with very nice qualities."
.
Scientists
Develop Protein-rich Potato
A
genetically engineered, protein-enriched potato is being readied
for commercial field-testing in India. Developed by Asis Datta
at the National Centre for Plant Genome Research in Jawaharlal
Nehru University, the "protato" - "pro"
from protein and "tato" from potato - has up to
35 percent more protein than a normal potato due to a gene
transfer from the amaranth plant. Potato, a starch-rich tuber,
contains barely one percent protein while the amaranth plant
has nutrition-rich leaves and seeds used for culinary purposes.
Scientists have isolated the gene in the amaranth responsible
for protein synthesis and have introduced it into potato,
thus increasing the tuber's protein content. Protato would
make a world of difference in nutrition since more than 40
percent of the world's malnutrition was caused by protein
deficiency. Though India is the world's largest potato producer,
it does not export any since domestic consumption itself is
high.
DNA
Technology Identifies Criminals on the Spot
Using
a hand-held scanner, police officials will soon be able to
identify criminals at the crime spot itself, thanks to a new
DNA technology developed by British scientists. The scanner
that is pre-fed with a massive DNA database, when fed with
parts of skin, hair or body fluids from the crime spot, would
break it down and turn it into a unique DNA profile. The machine
would then send a digital message to a central computer, which
would respond with the person's identity if he figures on
the police's rapidly growing database. According to one detective,
in future the only way criminals would be able to avoid being
caught would be if they were "booted and suited"
in protective clothing and carried their own oxygen supply.
"Just now we have ways of DNA profiling in a laboratory
that take a little time. We are trying to miniaturise that
into a little device," says Adrian Linacre, an expert
in forensic science.
Probe
Lands on Titan 350 Years After its Discovery
After
a seven-year, four-million-kilometre journey, the European
Space Agency (ESA)'s Huygens probe is now sitting on Titan,
Saturn's largest moon. The probe landed on Titan's surface
Jan 14, 350 years after it was discovered. The probe has begun
sending data, including first pictures and audio, which sounds
like some celestial heartbeat. "Huygens is mankind's
first successful attempt to land a probe on another world
in the outer solar system," said Jean-Jacques Dordain,
ESA's director general. "This is a great achievement
for Europe and its US partners in this ambitious international
endeavour to explore Saturn system." Though Titan is
classified as a moon, it is larger than the planets Mercury
and Pluto. It has a planet-like atmosphere that is denser
than those of Mercury, Earth, Mars and Pluto. "Titan
was always the target in the Saturn system where the need
for 'ground truth' from a probe was critical. It is a fascinating
world and we are now eagerly awaiting the scientific results,"
said David Southwood, director of ESA's scientific programme.
Spider
Silks The Intelligent Materials of
the Future
The
distinctive toughness of spider silk could allow manufacturers
to improve wound-closure systems and plasters, and to produce
artificial ligaments and tendons for durable surgical implants.
The silk could also be woven into strong textiles to make
parachutes, body armour, ropes and fishing nets. A whole range
of ecological materials could emerge from the industrial production
of spider silk. Thomas Scheibel, from the Department of Chemistry
of the Technische Universität in München explains
that there are currently over 34,000 described species of
spider, each with a specific tool-kit of silks with different
mechanical properties serving specific purposes. For example,
major ampullate silk, a very tough silk with a tensile strength
comparable to Kevlar, is used for the primary dragline or
scaffolding of the spider's web. Minor ampullate silk with
its very low elasticity is used to reinforce the web, while
the strong and stretchy flagelliform silk forms the capture
spiral of the web. "The future objective might not be
to prepare identical copies of natural silk fibres but rather
to capture key structural and functional features in designs
that could be useful for engineering applications" explains
the author.
Albatrosses
Fly Non-stop and in Sleep
The albatross,
traditionally regarded as a sign of good luck for sailors,
can fly across 25,000 miles, sometimes making non-stop trips
around the southern half of the globe. Until recently, little
was known about where the massive seabirds -- which breed
on islands north of Antarctica -- went during the non-breeding
season quoted a reputed Science magazine. According to the
study, 12 of the birds were seen to have circled the globe
at a latitude just south of Africa and South America, with
some birds even circling twice. The birds, with wingspans
of six and half feet, need little energy for flight. Albatrosses
fly at night and sometimes seem to sleep on their wings, said
biologist and lead researcher John Croxall. Some albatrosses
flew nearly 600 miles a day, and one of them made a 13,000-mile
trip in 46 days, he continues. Albatrosses are among the world's
most endangered birds, in part because an estimated 75,000
are snagged on hooks used by long-line fishing boats. One
solution could be the weighting of fishing lines to keep baited
hooks away from the birds, he said.
Source:
Webindia123.com / NewScientist.com
Compiled
by: Imran H. Khan
Copyright
(R) thedailystar.net 2004
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