Sci-tech
Exploding
Toads
Several
thousand toads in the north German city of Hamburg have mysteriously
and spontaneously blown up, spewing their entrails and body
parts over a wide area. Eyewitnesses say the toads swelled
up to three-and-a-half times their normal size before exploding.
It is like "a science-fiction film", according to
Werner Smolnik of a nature protection society in the northern
city of Hamburg. "You see the animals crawling on the
ground, swelling and then exploding." Vets and animal
welfare workers say the mystery disorder has cut a swathe
through the city's toad population. "I have never seen
such a thing," veterinarian Otto Horst said. So bad has
the death toll been that the lake in the Altona district of
Hamburg has been dubbed "the pond of death". Access
to it has been sealed off and every night a biologist visits
it between 2 a.m. and 3 a.m., which appears to be the peak
time for batrachians to go bang. Explanations include an unknown
virus, a fungus that has infected the water or crows attacking
the toads literally scaring them to death.
Robots
Turn Team Players
Researchers
from Ottawa based Frontline Robotics claim to have created
robots, which work as a team with an elected leader making
the best decisions for the group. As per the study, the robots
have been developed to enable them to work in groups or packs
using distributed intelligence, with their actions in co-ordination
to the response of other robots, much like the way social
insects such ants or bees collaborating during nest-building
or foraging. The robots would be applicable for a variety
of military and civilian applications, and can evolve problem
solving strategies in a much more significant manner compared
to scenarios where each robot acts independently. "Wherever
the task is dull, dangerous and dirty, robots should be in
the front line," Nature quoted Frontline's head, Richard
Lepack as saying, adding that the robots could provide valuable
help in investigating scenes of terrorist attack, nuclear
accidents or even in deep-sea construction. However, the robots
in these groups don't make decisions, but simply respond in
a programmed way to a set of input signals. In case the leader
is somehow put out of action, the team elects another.
GRUNTS
Presently,
Frontline has put their software into commercially available,
four-wheeled rover vehicles, making what they call unmanned
ground units or GRUNTS, which weigh as much as 450 kilograms
and still a little more than two metres. GRUNTS are intended
to perform reconnaissance, detection and security tasks for
military applications in conventional and urban zones. They
supplement close-in perimeter guards or anti-terrorist personnel
in extremely high-risk situations. GRUNTS are designed to
be medium-technology, cost-effective surrogates for the perimeter
security soldier. GRUNTS are hardened for battlefield survival
and priced to be replaceable. They willingly put themselves
in harm's way.
'Talking'
Bacteria to Aid Tissue Engineering
Researchers
have successfully programmed bacteria to communicate with
each other -- a development they hope will have applications
in the body's tissue and organ repair. Scientists at the US-based
Princeton University have been able to coax bacteria to produce
colour-coded patterns that help send massages to each other
making living cells function like 'tiny computers'. "We
are really moving beyond the ability to programme individual
cells to programming a large collection, millions or billions
of cells, to do interesting things," said study leader
Ron Weiss. E. coli, a bacteria in the human intestine, was
seen to emit red or green fluorescent light in response to
a signal emitted from another set of E. coli. Cells glowed
green when they sensed a higher concentration of the signal
chemical and red on sensing a lower concentration. In another
case, the bacteria were seen to form a bulls-eye pattern -
a green circle inside a red surrounding the sender cells.
According to scientists, the creation of patterns, such as
the bull's-eye effect, is a key step that would help the cells
secrete required material. Programmed cells also could in
the future be used to control the repair or construction of
tissues within the body, guide stem cells to the locations
where they are needed and even build physical devices such
as antennas or transmitters in places hard for humans to reach.
Eat
Ice-cream Be Happy
Scientists
have found that a spoonful of ice-cream lights up the same
pleasure centre in the brain as winning money or listening
to favourite music does. Neuroscientists at the Institute
of Psychiatry here scanned the brains of people eating vanilla
ice-cream. They found an immediate effect on parts of the
brain known to get activated when people enjoy themselves.
These include the orbitofrontal cortex, the "processing"
area at the front of the brain, reports the Guardian Unlimited.
The research was carried out by
Unilever using ice cream made by Walls, a company it owns.
"This is the first time we've been able to show that
ice-cream makes you happy. Just one spoonful lights up the
happy zones of the brain in clinical trials," said Don
Darling of Unilever.
Vertebrate
With
Shortest Life Span Researchers
at Australia's James Cook University claim to have discovered
the vertebrate with the shortest life span, a coral reef pygmy
gob, Eviota sigillata, which has a tiny coral reef fish has
a maximum life of just 59 days. Their study, to be published
in Current Biology, depicts the whole life cycle of these
fishes from the time they hatch to the time they die. This
study revealed that these fishes develop as larvae in the
open ocean for three weeks, nearly the half of their lives,
before locating and settling on a coral reef where they grow
to sexual maturity. With a reproductive life span of just
25 days, the female pygmy goby lays only three clutches of
eggs, totalling about 400 eggs, in a lifetime. The father
vigorously defends the minute eggs before they hatch into
larvae.
Source:
IANS, Guardian Unlimited, Frontline-robotics, Nature and Webindia123
Compiled
by: Imran H. Khan
Copyright
(R) thedailystar.net 2005
|
|