Science & TechnologyS

Meteor

Could Life Have Started In Lump Of Ice?

The universe is full of water, mostly in the form of very cold ice films deposited on interstellar dust particles, but until recently little was known about the detailed small scale structure. Now the latest quick freezing techniques coupled with sophisticated scanning electron microscopy techniques, are allowing physicists to create ice films in cold conditions similar to outer space and observe the detailed molecular organisation, yielding clues to fundamental questions including possibly the origin of life.
ice films
© iStockphoto/Christine BalderasPhysicists are creating ice films in cold conditions similar to outer space and observe the detailed molecular organization.

Researchers have been surprised by some of the results, not least by the sheer beauty of some of the images created, according to Julyan Cartwright, a specialist in ice structures at the Andalusian Institute for Earth Sciences (IACT) of the Spanish Research Council (CSIC) and the University of Granada in Spain.

Recent discoveries about the structure of ice films in astrophysical conditions at the mesoscale, which is the size just above the molecular level, were discussed at a recent workshop organised by the European Science Foundation (ESF) and co-chaired by Cartwright alongside C. Ignacio Sainz-Diaz, also from the IACT. As Cartwright noted, many of the discoveries about ice structures at low temperatures were made possible by earlier research into industrial applications involving deposits of thin films upon an underlying substrate (ie the surface, such as a rock, to which the film is attached), such as manufacture of ceramics and semiconductors. In turn the study of ice films could lead to insights of value in such industrial applications.

Sun

Is the Sun waking up?

IONOSPHERIC DISTURBANCE:
Image
© Rudolf Slosiar
Magnetic fields above sunspot 1007 erupted yesterday, Nov. 3rd, sparking a B8-class solar flare. Although B-flares are considered minor, the blast nevertheless made itself felt on Earth. X-rays bathed the dayside of our planet and sent a wave of ionization rippling through the atmosphere over Europe. The sudden ionospheric disturbance (SID) disrupted propagation of VLF radio signals, a phenomenon recorded by Rudolf Slosiar of Bojnice, Slovakia:

Telescope

Taurid meteors promise Guy Fawkes fireball show

Aficionados of meteor showers should cast their eyes heavenwards on 5 and 12 November for what are expected to be "unusually good" displays from the Taurids, possibly including fireball-inducing larger meteors colliding terminally with Earth's atmosphere.

The Taurid meteors - so named because they appear to emanate from the constellation Taurus - are the streamed remains of a disintegrated comet which "probably coalesced into a cluster due to gravitational tugs from Jupiter", as New Scientist puts it.

This cluster orbits the Sun every 3.4 years, so we don't always pass through it. But this year we're making a "glancing pass" of the debris; this began in October and will peak this month. The Taurids don't entertain with as many meteors as the Leonids or Perseids, but this time around they might offer around 20 burn-ups per hour.

The night of 5 November is reckoned to be the best bet, since the 12th is an almost full Moon. Northern hemisphere skywatchers will get the best view, although their southern hemisphere counterparts can take advantage of three to five hours of activity "around midnight on Wednesday, when the constellation Taurus is above the horizon".

Family

Study: Women Lead Men in Bacteria, Hands Down

WASHINGTON (AP) -- Wash your hands, folks, especially you ladies. A new study found that women have a greater variety of bacteria on their hands than men do. And everybody has more types of bacteria than the researchers expected to find.

''One thing that really is astonishing is the variability between individuals, and also between hands on the same individual,'' said University of Colorado biochemistry assistant professor Rob Knight, a co-author of the paper.

''The sheer number of bacteria species detected on the hands of the study participants was a big surprise, and so was the greater diversity of bacteria we found on the hands of women,'' added lead researcher Noah Fierer, an assistant professor in Colorado's department of ecology and evolutionary biology.

Health

Tiny Fungi May Have Sex While Infecting Humans

A fungus called microsporidia that causes chronic diarrhea in AIDS patients, organ transplant recipients and travelers has been identified as a member of the family of fungi that have been discovered to reproduce sexually. A team at Duke University Medical Center has proven that microsporidia are true fungi and that this species most likely undergoes a form of sexual reproduction during infection of humans and other host animals.
microsporidian spore
© CDC/NCID/DPD Parasite Image LibraryScanning electron micrograph of a microsporidian spore with an extruded polar tubule inserted into a eukaryotic cell. The spore injects the infective sporoplasms through its polar tubule.

The findings could help develop effective treatments against these common global pathogens and may help explain their most virulent attacks.

"Microsporidian infections are hard to treat because until now we haven't known a lot about this common pathogen," says Soo Chan Lee, Ph.D., lead author and a postdoctoral researcher in the Duke Department of Molecular Genetics and Microbiology. "Up to 50 percent of AIDS patients have microsporidial infections and develop chronic diarrhea. These infections are also detected in patients with traveler's diarrhea, and also in children, organ transplant recipients and the elderly."

Document

Earliest Known Hebrew Text In Proto-Canaanite Script Discovered

The earliest known Hebrew text written in a Proto-Canaanite script has been discovered by Hebrew University archaeologists in an ancient city in the area where legend has it that David slew Goliath - the earliest Judean city found to date. The 3,000 year old finding is thought to be the most significant archaeological discovery in Israel since the Dead Sea Scrolls - predating them by 1,000 years.
ostracon with the oldest known Hebrew inscription
© Gabi LaronThe ostracon with the oldest known Hebrew inscription.

The ostracon (pottery shard inscribed with writing in ink) comprises five lines of text divided by black lines and measures 15 x 15 cm. and was found at excavations of a 10th century B.C.E. fortress - the oldest known Judaic city. The ostracon was found lying on the floor inside a building near the city gate of the site, known as the Elah Fortress at Khirbet Qeiyafa.

Telescope

New Spaceship Force Field Makes Mars Trip Possible

According to the international space agencies, "Space Weather" is the single greatest obstacle to deep space travel. Radiation from the sun and cosmic rays pose a deadly threat to astronauts in space. New research shows how knowledge gained from the pursuit of nuclear fusion research may reduce the threat to acceptable levels, making man's first mission to Mars a much greater possibility.

The solar energetic particles, although just part of the 'cosmic rays' spectrum, are of greatest concern because they are the most likely to cause deadly radiation damage to the astronauts.

Large numbers of these energetic particles occur intermittently as "storms" with little warning and are already known to pose the greatest threat to man. Nature helps protect the Earth by having a giant "magnetic bubble" around the planet called the magnetosphere.

Magnify

Female Shaman's Grave Rich with Artifacts

Image
© N. HilgeThe shaman was buried in so-called Structure A, while other bodies were buried within the three burial pits within the cave in Israel. (Inset shows the region excavated by the archaeologists.
A 12,000-year-old burial site in Israel contains offerings that include 50 tortoise shells and a human foot, and appears to be one of the earliest known graves of a female shaman.

The remains were discovered in a small cave called Hilazon Tachtit, which functioned as a burial site for at least 28 individuals. The grave woman, likely a shaman, was separated from the other bodies by a circular wall of stones.

Display

Harnessing The Power Of The Brain

Once in a while, we run across a science story that is hard to believe until you see it. That's how we felt about this story when we first saw human beings operating computers, writing e-mails, and driving wheelchairs with nothing but their thoughts.

Einstein

Has new physics been found at the ageing Tevatron?

While engineers at the Large Hadron Collider (LHC) race to fix its teething problems and start looking for new particles, its ageing predecessor is refusing go silently into the night.

Last week, physicists announced that the Tevatron particle accelerator at Fermilab in Batavia, Illinois, has produced particles that they are unable to explain. Could it be a sign of new physics?

The Collider Detector at Fermilab (CDF) monitors the particles that spew from collisions between protons and anti-protons, which are accelerated and smashed head-on by the Tevatron. The collision occurs inside the 1.5-centimetre-wide "beam pipe" that confines the protons and anti-protons, and the particles created are tracked by surrounding layers of electronics.
Collider Detector at Fermilab
© FermilabThe Collider Detector at Fermilab has found hints of new physics.

In this instance, the CDF was looking at bottom quarks and bottom anti-quarks that decay into, among other things, at least two charged particles called muons.