Δευτέρα, 30 Απριλίου 2012

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Phase-sensitive optical data transmission: a new frontier

Posted: 30 Apr 2012 07:40 AM PDT

Fibre-optic cables are becoming the backbone of the Internet, from the main trunk lines between cities, countries and continents to the network of cables running from telephone central offices to individual homes and mobile phone base stations. A pioneering approach to data transmission, supported by EU funding, promises to increase the capacity, range and efficiency of fibre-optic networks.

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Bullied children three times more likely to self harm

Posted: 30 Apr 2012 07:09 AM PDT

New research finds that children who are bullied in childhood are up to three times more likely to self harm up by the age of 12. The study, from researchers at King’s College London’s Institute of Psychiatry (IoP) was published on bmj.com.

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Abnormal Levels of Uric Acid in Teens Linked to High Blood Pressure

Posted: 30 Apr 2012 06:55 AM PDT

Teens with high levels of uric acid appear to be at increased risk for high blood pressure, according to results of research from scientists at the Johns Hopkins Children's Center.

Although the findings do not establish a cause-and-effect link between uric acid and high blood pressure, they point to uric acid as one potential mechanism, or at least a biomarker, of disease, the researchers report in the April issue of the journal Hypertension.

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Scientists Identify Brain Circuitry Associated with Addictive, Depressive Behaviors

Posted: 30 Apr 2012 06:42 AM PDT

Scientists at the UCSF-affiliated Gladstone Institutes have determined how specific circuitry in the brain controls not only body movement, but also motivation and learning, providing new insight into neurodegenerative disorders such as Parkinson’s disease — and psychiatric disorders such as addiction and depression.

Previously, researchers in the laboratory of Gladstone Investigator Anatol Kreitzer, PhD, discovered how an imbalance in the activity of a specific category of brain cells is linked to Parkinson’s.

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24 new species of lizards discovered on Caribbean islands are close to extinction

Posted: 30 Apr 2012 06:19 AM PDT

In a single new scientific publication, 24 new species of lizards known as skinks, all from islands in the Caribbean, have been discovered and scientifically named. According to Blair Hedges, a professor of biology at Penn State University and the leader of the research team, half of the newly added skink species already may be extinct or close to extinction, and all of the others on the Caribbean islands are threatened with extinction.

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Pacific Islands May Become Refuge for Corals in a Warming Climate, Study Finds

Posted: 29 Apr 2012 08:17 PM PDT

Scientists have predicted that ocean temperatures will rise in the equatorial Pacific by the end of the century, wreaking havoc on coral reef ecosystems. But a new study shows that climate change could cause ocean currents to operate in a surprising way and mitigate the warming near a handful of islands right on the equator. As a result these Pacific islands may become isolated refuges for corals and fish.

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Newsletter for Monday 30 April


Newsletter - April 30 - Today in Science History


Feature for Today
On 30 Apr 1897, at the Royal Institution Friday Evening Discourse, Joseph John (J.J.) Thomson first announced the existence of the electron (as they are now named). He called it a corpuscle, meaning "small body."

Thomson described his discovery and calculations that the particle of matter was a thousand times smaller than the atom.

Although as director of the Cavendish Laboratory at the University of Cambridge,
Thomson was one of the most respected British physicists, the scientists present found the news hard to believe. It had long been held that the atom was the smallest and indivisible part of matter that could exist.

Nevertheless, the electron was the first elementary particle to be discovered.

You can read Thomson's own words, as delivered at that meeting, in his paper, Cathode Rays, from the Proceedings of the Royal Institution, 1897.

Book of the Day
On 30 Apr 1834, John Lubbock (Lord Avery) was born, an English banker, politician, naturalist and archaeologist who coined the terms Neolithic and Paleolithic. His career was astonishingly productive in a broad range of interests. He was a man always in search of knowledge and sharing knowledge. Out of this many publications, today's Science Store pick is one of his widely read books in natural history - Ants, Bees, and Wasps: A Record of Observations on the Habits of the Social Hymenoptera, by John Lubbock. In this pioneering work, mostly related to ants, he gives considerable detail including formation and maintenance of nests, relation of ants to plants and animals, behavior, recognition of friends, power of communications and senses. He also used obstacles and mazes to test the intelligence of ants, thus anticipating animal psychologists like Kohler. While Lubbock was young, his father was persuaded by Charles Darwin to give him a microscope. Thus Lubbock acquired his love and respect of nature and science - with a legacy from Darwin! With his own writing skills, was to make plain to the layman the aims and conclusions of specialists. New, Price $37.50 (as of time of writing).

Yesterday's pick: The Value of Science: Essential Writings of Henri Poincaré, by Henri Poincaré.

For picks from earlier newsletters, see the Today in Science Science Store home page.

Quotations for Today

"When you are famous it is hard to work on small problems. This is what did Shannon in. After information theory, what do you do for an encore? The great scientists often make this error. They fail to continue to plant the little acorns from which the mighty oak trees grow. They try to get the big thing right off. And that isn't the way things go. So that is another reason why you find that when you get early recognition it seems to sterilize you."
- About Claude Elwood Shannon, American mathematician (born 30 Apr 1916) by Richard Hamming  Quotes Icon
"If we are ever in doubt about what to do, it is a good rule to ask ourselves what we shall wish on the morrow that we had done."
- John Lubbock (Lord Avebury), English banker, politician, naturalist and archaeologist who coined the terms Neolithic and Paleolithic (born 30 Apr 1834)  Quotes Icon
"Mathematics is the queen of the sciences and arithmetic is the queen of mathematics. She often condescends to render service to astronomy and other natural sciences, but in all relations, she is entitled to first rank."
Carl Friedrich Gauss, German mathematician (born 30Apr 1777)  Quotes Icon

Before you look at today's web page, see if you can answer some of these questions about the events that happened on this day. Some of the names are very familiar. Others will likely stump you. Tickle your curiosity with these questions, then check your answers on today's web page.

Eugen Bleuler, born 30 Apr 1857, was a Swiss psychiatrist, who introduced the now current term (1908) to describe the disorder previously known as dementia praecox. For his studies of this disorder, he was one of the most influential psychiatrists of his time.
What name did Bleuler give to dementia praecox, by which is now known?
Robert Fitzroy (1805-1865) was the British naval officer who commanded the round the world voyage on which Charles Darwin sailed as the ship's naturalist. That voyage provided Darwin with much of the material on which he based his theory of evolution. When Fitzroy retired he devoted himself to meteorology. He devised a storm warning system that was the prototype of the daily weather forecast, invented a barometer, and published The Weather Book (1863).
What was the name of the vessel carrying Darwin that Fitzroy commanded?

On 30 Apr 1960, the oldest banded U.S. bat was identified, from the date read on the band. It was a female little brown bat (the most abundant bat species in the U.S.)
What do you think was the age of this oldest U.S. bat?

On 30 Apr 1955, the element 101, was announced. It was named in honour of a scientist that contributed to the periodic table of the elements.
What is the name of element 101?

On 30 Apr 1897, at the Royal Institution Friday Evening Discourse, Joseph John Thomson (1856-1940) first announced the existence of electrons - as they are now named. Earlier in the year, he had made the surprising discovery of this particle of matter a thousand times smaller than the atom. He referred to it by a name he based on the Latin words for "small body." (Later, the electron became known by its present name, based on the Greek word for "amber.")
What was Thomson's original name for the electron?


When you have your answers ready to all the questions above, you'll find all the information to check them, and more, on the April 30 web page of Today in Science History. Or, try this link first for just the brief answers.

Fast answers for the previous newsletter for April 29: Gene Shoemaker; Dutch; the number of chromosomes is the same in all body cells of a single species; the Kon Tiki; Erwin Schrödinger.

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