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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.

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.

Thursday, June 26, 2008

Gunmen today opened fire in a Mexico City restaurant, killing a top police official in charge of monitoring the country’s illegal drug trade, as well as one of his bodyguards, Mexican officials said. The attack is the latest waged against authorities attempting to fight Mexico’s powerful drug cartels.

Security officials in Mexico City say the attack occurred as Igor Labastida Calderón, commander of the federal police‘s Traffic and Contraband division, was eating lunch with one of his bodyguards, Jose Maria Ochoa. According to Minerva Amado, spokesperson for the attorney general’s office, two unknown subjects got out of a black vehicle, entered the restaurant, and opened fire on Labastida Calderón.

Reports differ on who else was injured in the attack. Amado said two other bodyguards were injured and hospitalized, while Mexico City newspaper El Universal reports that three civilians were injured.

The motive for the attack remains unclear. No arrests have been made so far, as police continue to search for the assailants. Federal police have refused to comment.

President Felipe Calderón has sent over 20,000 troops throughout Mexico in an attempt to take back areas controlled by the country’s drug cartels. Since Calderón took office in December 2006, more than 4,000 people have been killed by these drug cartels, allegedly including federal police chief Édgar Millán Gómez, whose May death was attributed to the Sinaloa Cartel.

Monday, July 18, 2005

On July 13, 21 French and Japanese individuals sued Shintaro Ishihara, the governor of Tokyo, for defamation towards people who use the French language. Those 21 were French language teachers and Japanese researchers who taught French. In 2004, Ishihara said that no one can count in the French language. Ishihara was sued for 500,000 yen (approx. US $4,457) for each plaintiff, including Malik Berkane, a French private language school owner in Tokyo. In addition, the plaintiffs demanded that he make an apology.

On October 19, 2004, Ishihara said “French language is a language in which no one can count, therefore it seems to me reasonable that it is disqualified as an international language. People who are tied to the language have taken it upon themselves to oppose [me]. It is all ridiculous” in a speech Ishihara made at the inaugural celebrations of the “Tokyo U-Club”. The Tokyo U-club was founded to support the foundation of Tokyo Metropolitan University (Japanese: ??????, Shuto daigaku Tokyo), which was planned by Ishihara as replacement of universities run by the Tokyo metropolitan government including the same name in English (Japanese: ?????? Tokyo Toritsu Daigaku).

On August 1, 2003, Ishihara issued his plan to found the new university. His plan had no relation to the restructuring plan of the former Tokyo Metropolitan University which had been on-going for years in cooperation with faculty and Tokyo prefectural government. In his new plan faculties of Humanities, Economics and Law would be drasticially changed and divided into newly organized faculties and departures. As for humanities, literature and language studies would be re-organized into language section and literature section, reduced in number of students, and undergraduate and graduate would be relocated into separate campuses. Quite a few members of the Faculty of Humanities opposed this idea strongly and called for opposition widely. As to that its all faculty issued the opposition on the consensus of all faculty on September 25, 2003. The department of French literature and language was a key group in the movment. Also in 2004, Professor Masato Goda, a teacher of French literature, resigned to express his opposition toward Ishihara’s educational policy.

Berkane said “I was very shocked when I heard that. Of course we can count numbers in French, and it is used as an official language in international organisations.” “I have been in Japan for 23 years. I am sad that what I have taught in that time is denigrated.” Berkane said that he had sent a memorandum to Ishihara in February to ask the governer to apologize but he had as yet received no reply from Ishihara.

On July 15, Ishihara again expressed his opinion that French was formerly a diplomatic lingua franca but due to its complexity it had been falling back. He mentioned that no student had registered in French language lessons at the newly founded Tokyo Metropolitan University. He also stated plaintiffs should have considered seriously if his criticism was appropriate or not.

Thursday, December 18, 2008

A team of eight transplant surgeons in Cleveland Clinic in Ohio, USA, led by reconstructive surgeon Dr. Maria Siemionow, age 58, have successfully performed the first almost total face transplant in the US, and the fourth globally, on a woman so horribly disfigured due to trauma, that cost her an eye. Two weeks ago Dr. Siemionow, in a 23-hour marathon surgery, replaced 80 percent of her face, by transplanting or grafting bone, nerve, blood vessels, muscles and skin harvested from a female donor’s cadaver.

The Clinic surgeons, in Wednesday’s news conference, described the details of the transplant but upon request, the team did not publish her name, age and cause of injury nor the donor’s identity. The patient’s family desired the reason for her transplant to remain confidential. The Los Angeles Times reported that the patient “had no upper jaw, nose, cheeks or lower eyelids and was unable to eat, talk, smile, smell or breathe on her own.” The clinic’s dermatology and plastic surgery chair, Francis Papay, described the nine hours phase of the procedure: “We transferred the skin, all the facial muscles in the upper face and mid-face, the upper lip, all of the nose, most of the sinuses around the nose, the upper jaw including the teeth, the facial nerve.” Thereafter, another team spent three hours sewing the woman’s blood vessels to that of the donor’s face to restore blood circulation, making the graft a success.

The New York Times reported that “three partial face transplants have been performed since 2005, two in France and one in China, all using facial tissue from a dead donor with permission from their families.” “Only the forehead, upper eyelids, lower lip, lower teeth and jaw are hers, the rest of her face comes from a cadaver; she could not eat on her own or breathe without a hole in her windpipe. About 77 square inches of tissue were transplanted from the donor,” it further described the details of the medical marvel. The patient, however, must take lifetime immunosuppressive drugs, also called antirejection drugs, which do not guarantee success. The transplant team said that in case of failure, it would replace the part with a skin graft taken from her own body.

Dr. Bohdan Pomahac, a Brigham and Women’s Hospital surgeon praised the recent medical development. “There are patients who can benefit tremendously from this. It’s great that it happened,” he said.

Leading bioethicist Arthur Caplan of the University of Pennsylvania withheld judgment on the Cleveland transplant amid grave concerns on the post-operation results. “The biggest ethical problem is dealing with failure — if your face rejects. It would be a living hell. If your face is falling off and you can’t eat and you can’t breathe and you’re suffering in a terrible manner that can’t be reversed, you need to put on the table assistance in dying. There are patients who can benefit tremendously from this. It’s great that it happened,” he said.

Dr Alex Clarke, of the Royal Free Hospital had praised the Clinic for its contribution to medicine. “It is a real step forward for people who have severe disfigurement and this operation has been done by a team who have really prepared and worked towards this for a number of years. These transplants have proven that the technical difficulties can be overcome and psychologically the patients are doing well. They have all have reacted positively and have begun to do things they were not able to before. All the things people thought were barriers to this kind of operations have been overcome,” she said.

The first partial face transplant surgery on a living human was performed on Isabelle Dinoire on November 27 2005, when she was 38, by Professor Bernard Devauchelle, assisted by Professor Jean-Michel Dubernard in Amiens, France. Her Labrador dog mauled her in May 2005. A triangle of face tissue including the nose and mouth was taken from a brain-dead female donor and grafted onto the patient. Scientists elsewhere have performed scalp and ear transplants. However, the claim is the first for a mouth and nose transplant. Experts say the mouth and nose are the most difficult parts of the face to transplant.

In 2004, the same Cleveland Clinic, became the first institution to approve this surgery and test it on cadavers. In October 2006, surgeon Peter Butler at London‘s Royal Free Hospital in the UK was given permission by the NHS ethics board to carry out a full face transplant. His team will select four adult patients (children cannot be selected due to concerns over consent), with operations being carried out at six month intervals. In March 2008, the treatment of 30-year-old neurofibromatosis victim Pascal Coler of France ended after having received what his doctors call the worlds first successful full face transplant.

Ethical concerns, psychological impact, problems relating to immunosuppression and consequences of technical failure have prevented teams from performing face transplant operations in the past, even though it has been technically possible to carry out such procedures for years.

Mr Iain Hutchison, of Barts and the London Hospital, warned of several problems with face transplants, such as blood vessels in the donated tissue clotting and immunosuppressants failing or increasing the patient’s risk of cancer. He also pointed out ethical issues with the fact that the procedure requires a “beating heart donor”. The transplant is carried out while the donor is brain dead, but still alive by use of a ventilator.

According to Stephen Wigmore, chair of British Transplantation Society’s ethics committee, it is unknown to what extent facial expressions will function in the long term. He said that it is not certain whether a patient could be left worse off in the case of a face transplant failing.

Mr Michael Earley, a member of the Royal College of Surgeon‘s facial transplantation working party, commented that if successful, the transplant would be “a major breakthrough in facial reconstruction” and “a major step forward for the facially disfigured.”

In Wednesday’s conference, Siemionow said “we know that there are so many patients there in their homes where they are hiding from society because they are afraid to walk to the grocery stores, they are afraid to go the the street.” “Our patient was called names and was humiliated. We very much hope that for this very special group of patients there is a hope that someday they will be able to go comfortably from their houses and enjoy the things we take for granted,” she added.

In response to the medical breakthrough, a British medical group led by Royal Free Hospital’s lead surgeon Dr Peter Butler, said they will finish the world’s first full face transplant within a year. “We hope to make an announcement about a full-face operation in the next 12 months. This latest operation shows how facial transplantation can help a particular group of the most severely facially injured people. These are people who would otherwise live a terrible twilight life, shut away from public gaze,” he said.

Tuesday, July 12, 2005

Doctors at the regional burn center at St. Joseph Hospital in Fort Wayne, Indiana are treating a patient flown in from war-torn Afghanistan.

U.S. Army’s 113th Battalion, which is made up of Indiana National Guardsman, discovered five-year-old Zia after a propane explosion in suburban Kabul] earlier this year destroyed homes and killed six of the boy’s family members.

The blast left Zia with third degree burns on his arms, torso and legs. Guardsmen, familiar with the Fort Wayne burn center, worked with non-profit group, Northeast Indiana Burn Council to raised $18,500 to fly Zia, accompanied by his father Abdul Qahir, to Fort Wayne for treatment.

Upon arrival, he was rushed to the St. Joseph burn unit, where after a few days of recovery fromtravel, underwent his first surgery June 23. The second and final surgery was postponed ninedays from an original date of July 2 because the boy developed an infection in one of his wounds,which is common for burn patients.

The second surgery grafted skin onto burn wounds on Zia’s arm, chest and the second toe on hisright foot. Tuesday, doctors said Zia was recovering and appeared to be in good spirits. Inpreparation for their planned return trip to Afghanistan in September, doctors are teaching Zia’sfather physical therapy techniques needed for further recovery. “Without good therapy, he couldbe right back where we started,” Dr. John Mancoll, the lead surgeon on the case, said in aninterview with the Fort Wayne Journal Gazette newspaper.

Friday, September 14, 2007

The Kennedy Center announced that its 30th presentation of the Kennedy Center Honors would go to pianist Leon Fleisher, comedian Steve Martin, singer Diana Ross, director Martin Scorsese and musician Brian Wilson. The Center was opened to the public in 1971 and was envisioned as part of the National Cultural Center Act, which mandated that the independent, privately-funded institution would present a wide variety of both classical and contemporary performances, commission the creation of new artistic works, and undertake a variety of educational missions to increase awareness of the arts.

In a statement, Kennedy Center Chairman Stephen A. Schwarzman said that “with their extraordinary talent, creativity and perseverance, the five 2007 honorees have transformed the way we, as Americans, see, hear and feel the performing arts.”

Fleisher, 79, a member of the Peabody Institute‘s music faculty, is a pianist who lost use of his right hand in 1965 due to a neurological condition. He became an accomplished musician and conductor through the use of his left hand. At 67, he regained the use of his right hand. With the advent of Botox therapy, he was once more able to undertake two-hand performances in 2004, his first in four decades. “I’m very gratified by the fact that it’s an apolitical honor,” Fleisher said. “It is given by colleagues and professional people who are aware of what [an artist] has done, so it really is apolitical — and that much more of an honor.”

Martin, 62, a comedian who has written books and essays in addition to his acting and stand-up comedy career, rose to fame during his work on the American television program Saturday Night Live in the 1970’s. Schwarzman praised his work as that of a “renaissance comic whose talents wipe out the boundaries between artistic disciplines.” Martin responded to the honor saying, “I am grateful to the Kennedy Center for finally alleviating in me years of covetousness and trophy envy.”

Ross, 63, was a product of Detroit‘s Brewster-Douglass Projects when as a teeager she and friends Mary Wilson and Florence Ballardis formed The Supremes, a ground-breaking Motown act. She portrayed singer Billie Holiday in the 1972 film Lady Sings the Blues, which earned her an Oscar nomination and a Golden Globe award. “Diana Ross’ singular, instantly recognizable voice has spread romance and joy throughout the world,” said Schwarzman. Ross said she was “taken aback. It is a huge, huge honor and I am excited to be in this class of people.”

Scorsese, 64, is one of the most accomplished directors the United States ever produced, whose work includes Mean Streets, Taxi Driver, GoodFellas, Cape Fear, The Last Temptation of Christ and The Departed, for which he won a 2006 Academy Award for Best Director after being nominated eight times. Scorsese said, “I’m very honored to be receiving this recognition from the Kennedy Center and proud to be joining the company of the very distinguished individuals who have received this honor in years past.”

Wilson, 65, along with his brothers Dennis and Carl, formed the Beach Boys in 1961. They had a series of hits that included “Surfin’ U.S.A.” and “Wouldn’t It Be Nice.” Their 1966 album Pet Sounds is considered one of the most influential recordings in American music. “This is something so unexpected and I feel extremely fortunate to be in the company of such great artists,” said Wilson, who is currently on tour.

The Kennedy Center’s board of trustees is responsible for selecting honorees for “lifetime contributions to American culture through the performing arts.” Previous honorees, including Elton John and Steven Spielberg, also submitted recommendations. A wide variety of people were under consideration, including Emanuel Ax, Evgeny Kissin, Renee Fleming, Laurence Fishburne, Francis Ford Coppola, Melissa Etheridge and Kenny Chesney.

President Bush and first lady Laura Bush will attend the center’s presentation at its opera house on December 2, 2007, which will broadcast on December 26 on CBS.