Thursday, June 23, 2011

NASA’s Cassini–Huygens spacecraft has discovered evidence for a large-scale saltwater reservoir beneath the icy crust of Saturn’s moon Enceladus. The data came from the spacecraft’s direct analysis of salt-rich ice grains close to the jets ejected from the moon. The study has been published in this week’s edition of the journal Nature.

Data from Cassini’s cosmic dust analyzer show the grains expelled from fissures, known as tiger stripes, are relatively small and usually low in salt far away from the moon. Closer to the moon’s surface, Cassini found that relatively large grains rich with sodium and potassium dominate the plumes. The salt-rich particles have an “ocean-like” composition and indicate that most, if not all, of the expelled ice and water vapor comes from the evaporation of liquid salt-water. When water freezes, the salt is squeezed out, leaving pure water ice behind.

Cassini’s ultraviolet imaging spectrograph also recently obtained complementary results that support the presence of a subsurface ocean. A team of Cassini researchers led by Candice Hansen of the Planetary Science Institute in Tucson, Arizona, measured gas shooting out of distinct jets originating in the moon’s south polar region at five to eight times the speed of sound, several times faster than previously measured. These observations of distinct jets, from a 2010 flyby, are consistent with results showing a difference in composition of ice grains close to the moon’s surface and those that made it out to the E ring, the outermost ring that gets its material primarily from Enceladean jets. If the plumes emanated from ice, they should have very little salt in them.

“There currently is no plausible way to produce a steady outflow of salt-rich grains from solid ice across all the tiger stripes other than salt water under Enceladus’s icy surface,” said Frank Postberg, a Cassini team scientist at the University of Heidelberg in Germany.

The data suggests a layer of water between the moon’s rocky core and its icy mantle, possibly as deep as about 50 miles (80 kilometers) beneath the surface. As this water washes against the rocks, it dissolves salt compounds and rises through fractures in the overlying ice to form reserves nearer the surface. If the outermost layer cracks open, the decrease in pressure from these reserves to space causes a plume to shoot out. Roughly 400 pounds (200 kilograms) of water vapor is lost every second in the plumes, with smaller amounts being lost as ice grains. The team calculates the water reserves must have large evaporating surfaces, or they would freeze easily and stop the plumes.

“We imagine that between the ice and the ice core there is an ocean of depth and this is somehow connected to the surface reservoir,” added Postberg.

The Cassini mission discovered Enceladus’ water-vapor and ice jets in 2005. In 2009, scientists working with the cosmic dust analyzer examined some sodium salts found in ice grains of Saturn’s E ring but the link to subsurface salt water was not definitive. The new paper analyzes three Enceladus flybys in 2008 and 2009 with the same instrument, focusing on the composition of freshly ejected plume grains. In 2008, Cassini discovered a high “density of volatile gases, water vapor, carbon dioxide and carbon monoxide, as well as organic materials, some 20 times denser than expected” in geysers erupting from the moon. The icy particles hit the detector target at speeds between 15,000 and 39,000 MPH (23,000 and 63,000 KPH), vaporizing instantly. Electrical fields inside the cosmic dust analyzer separated the various constituents of the impact cloud.

“Enceladus has got warmth, water and organic chemicals, some of the essential building blocks needed for life,” said Dennis Matson in 2008, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California.

“This finding is a crucial new piece of evidence showing that environmental conditions favorable to the emergence of life can be sustained on icy bodies orbiting gas giant planets,” said Nicolas Altobelli, the European Space Agency’s project scientist for Cassini.

“If there is water in such an unexpected place, it leaves possibility for the rest of the universe,” said Postberg.

Wednesday, February 22, 2012

Crown Office are staying quiet about possible prosecutions after an inquiry found medical failures caused three deaths at NHS Lanarkshire.

In response to a specific question as to the possibility of prosecutions, a Crown Office spokesperson told Wikinews today that “The three deaths were fully investigated by the Procurator Fiscal and reported to Crown Counsel [laywers] to consider. Crown Counsel concluded that, given the facts and circumstances of the deaths, a Fatal Accident Inquiry (FAI) was the appropriate forum to consider the circumstances of the deaths.” It was further noted that “[a] FAI cannot make any findings of fault/blame against individuals.”

However, Crown Office did not specifically rule out prosecutions for offences such as cuplable homicide despite the spokesperson noting this was a direct response to such a question. They also declined to comment on National Health Service care as “it would not be appropriate to comment on the provision of NHS services” and entirely ignored questions about Crown Office satisfaction in the inquiry’s outcome and the length of time it took to reach a conclusion. The inquiry wrapped up last week but the deaths were in 2006.

Agnes Nicol, George Johnstone, and Andrew Ritchie died within a three-month period following keyhole surgery to remove their gall bladders.

Later expanded to look at all three deaths, the inquiry initially established to look into the case of Nicol, 50, who received surgery in late 2005. A surgeon at Wishaw General Hospital mistakenly cut her bile duct and her right hepatic artery. Whilst suturing her portal vein, her liver was left with 20% of its normal blood supply; the errors were not discovered until her transfer to liver specialists at Edinburgh’s Royal Infirmary.

By then, her liver was seriously damaged. She developed septicaemia, dying from multiple organ failure in March 2006.

Johnstone, 54, underwent the same procedure at Monklands District General Hospital on May 9, 2006. A consultant surgeon accidentally damaged, possibly severing, his bile duct. He died two days later in intensive care from the combined effects of multiple organ failure and a heart ailment.

Ritchie, 62, died in intensive care a week after an operation in June 2006. He died from intra abdominal haemorrhage caused by errors during the surgery.

Different surgeons were involved each time and the inquiry, under Sheriff Robert Dickson, found no evidence of poor training or inadequate experience. Dickson noted that in each case there was lack of action on a “growing body of evidence that there was something fundamentally wrong with the patient” and surgeons failed to contemplate their own actions as potentially responsible. He agreed with two professors that it may have been possible to save their lives “had the post-operative care been to the standard which they expected, and had there been a proper management plan which staff could have worked to” and noted that all the patients suffered from a lack of adequate medical notes being available after their surgery. He described the care as having “clear faults”.

NHS Lanarkshire apologised and said improvements had been made regarding “these types of cases” as well as with document management. Wikinews got in touch seeking details of the changes made but the health trust failed to respond.

Saturday, March 28, 2009

The 108-floor central component of the new World Trade Center in New York City has been officially renamed 1 World Trade Center, ending the Freedom Tower moniker it had sported since 2003.

Freedom Tower was envisioned as a symbol of America’s victory over terrorism. It is currently on track for completion in 2013, with 10 floors partially finished so far.

Port Authority Chairman Anthony Coscia commented on the change, “It’s the one that is easiest for people to identify with — and frankly, we’ve gotten a very interested and warm reception to it.”

Former Governor George Pataki, who revealed the Freedom Tower name nearly six years ago, was critical of the switch, saying “The Freedom Tower is not simply another piece of real estate and not just a name for marketing purposes.”

1 World Trade Center has been the building’s legal name and address for the past two years, with the public change precipitated by the ramp up of construction and the commencement of lease marketing.

Mayor Michael Bloomberg seemed ambivalent to the change, saying “I would like to see it stay the Freedom Tower, but it’s their building, and they don’t need me dumping on it. If they could rent the whole thing by changing the name, I guess they’re going to do that, and they probably, from a responsible point of view, should. From a patriotic point of view, is it going to make any difference?”

The change was approved following the signing of a two-decades-long lease by a Chinese real estate company, which plans to occupy floors 64 through 69. Other future tenants include the U.S. General Services Administration and the New York State Office of General Services.