Sci-tech
Ouchless
Injections
There
is good news for people who are terrified at the sight of
an injection, which makes a visit to the doctor's clinic for
immunisation vaccines or other drugs, an ordeal. A new MicroJet
injector being developed by bioengineering students at the
University of California, Berkeley, may help ease some of
that dread by taking the needle and the pain out of the equation.
The MicroJet uses an electronic actuator that could one day
propel vaccinations, insulin or other drugs through the skin
of the patient - without the device even touching the skin
- with far less pain than a hypodermic needle. "The World
Health Organisation advocates developing needleless drug delivery
technologies because of the problems of contamination and
disposal that go along with hypodermic needles," said
Laleh Jalilian, one of the three UC Berkeley bioengineering
undergraduates on the project. "There are other jet injectors
on the market but they are plagued by variability in the percentage
of liquid delivered, which means that it is difficult to know
exactly how much of the drug actually gets into the patient.
The MicroJet we are developing uses a tunable electronic circuit
to offer a finer level of control than the air- and spring-powered
models available now."
Computer+Overuse=Kids
Poor in Studies
A
new study suggests that the less students use computers at
school and at home, the better they do in international tests
of literacy and maths. The team analysed the achievements
and home backgrounds of 100,000 15-year-olds in 31 countries
taking part in the Pisa (Programme for International Student
Assessment) study in 2000 for the Organisation for Economic
Co-operation and Development. They found that being able to
use a computer at work - one of the justifications for devoting
so much teaching time to ICT (information and communications
technology) - had no greater impact on employability or wage
levels than being able to use a telephone or a pencil. "Despite
numerous claims by politicians and software vendors to the
contrary, the evidence so far suggests that computer use in
schools does not seem to contribute substantially to students'
learning of basic skills such as maths or reading," the
authors of the study said. The more access pupils had to computers
at home, the lower they scored in tests, partly because they
diverted attention from homework. Pupils tended to do worse
in schools generously equipped with computers, apparently
because computerised instruction replaced more effective forms
of teaching.
No
Black Holes!
Black
holes have been the centre of science fiction novels and many
think astronomers have observed them indirectly. But according
to a physicist at the Lawrence Livermore National Laboratory
in California, these awesome breaches in space-time do not
and indeed cannot exist. Over the past few years, observations
of the motions of galaxies have shown that some 70 percent
the Universe seems to be composed of a strange 'dark energy'
that is driving the Universe's accelerating expansion. George
Chapline thinks that the collapse of the massive stars, which
was long believed to generate black holes, actually leads
to the formation of stars that contain dark energy. "It's
a near certainty that black holes don't exist," he was
quoted by Nature as saying. Black holes are one of the most
celebrated predictions of Einstein's general theory of relativity,
which explains gravity as the warping of space-time caused
by massive objects. The theory suggests that a sufficiently
massive star, when it dies, will collapse under its own gravity
to a single point. It is a near certainty that black holes
don't exist.
Technology
Threatens
Doctor-patient Relationships
Family
doctors no more play the role of a 'father figure', with most
patients increasingly turning to the Internet for medical
advice, a new study reveals. Elaine Brohan, a psychologist
from the University of Surrey in Guildford, conducted in-depth
interviews with nine rural and urban GPs in Ireland and found
that patients had acquired enough medical knowledge from the
Internet and were confronting doctors showing them web site
print-outs. Presenting her findings at the British Psychological
Society's conference at the University of Manchester, Brohan
said that in the past, a GP represented the face of authority,
but doctors were switching from being a 'father figure' to
a 'facilitator'. The study suggested that doctors are now
providing guidance and advice rather than acting as the source
of all medical knowledge, because patients were already crammed
with information.
Key
to Immortality
In
a new study, researchers at the University of Sydney believe
they may be able to significantly increase people's lifespans
by learning why cancer cells are immortal. "They never
die. They'll go on forever. Cancer cells survive at the expense
of every other cell in the body. The cancer cells take all
the nutrients and the rest of the body goes through organ
failure and death," said lead researcher Brian Morris.
He added that a molecule in cancer cells called tolomerase
which prevented the degradation of tolemeres - or protective
caps at the end of chromosomes - was believed responsible
for keeping the cells alive. "Some people suggest that
by over-expressing tolomerase in all cells in the body, maybe
we could make humans ... immortal. If it can be applied in
a totally regulated, controlled manner to all cells of the
body, we could massively extend the human lifespan,"
he added.
Source:
Google, Webindia123 and Scientific America.
Compiled
by: Imran H. Khan
Copyright
(R) thedailystar.net 2005
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