Physicists detect geo-neutrinos from deep within Earth’s core

Washington, March 27 (ANI): In a new study, two University of Massachusetts Amherst physicists are measuring some of the faintest and rarest particles ever detected, geo-neutrinos, from deep within Earth, with the greatest precision yet achieved.

The data, being collected using a delicate instrument located under a mountain in central Italy, reveal, for the first time, a well defined signal, above background noise, of the extremely rare geo-neutrino particle from deep within Earth.

Geo-neutrinos are anti-neutrinos produced in the radioactive decays of uranium, thorium, potassium and rubidium found in ancient rocks deep within our planet.

These decays are believed to contribute a significant but unknown fraction of the heat generated inside Earth, where this heat influences volcanic activity and tectonic plate movements, for example.

Borexino, the large neutrino detector, serves as a window to look deep into the Earth’s core and report on the planet’s structure.

Borexino is located at the Laboratorio Nazionale del Gran Sasso underground physics laboratory in a 10 km-long tunnel about 5,000 feet (1.5 km) under Gran Sasso, or Great Rock Mountain, in the Appenines and operated by Italy’s Institute of Nuclear Physics.

The instrument detects anti-neutrinos and other subatomic particles that interact in its special liquid center, a 300-ton sphere of scintillator fluid surrounded by a thin, 27.8-foot diameter transparent nylon balloon.

The new Borexino data have stronger significance because of their purity and the absence of nuclear reactors.

According to UMass Amherst researcher Andrea Pocar, “The Borexino detector is very clean and has lower levels of radioactive impurities than ever achieved in experiments of this kind.”

“It is indeed a very ‘quiet’ apparatus for the observation of low energy neutrinos, and exceptionally precise for distinguishing these particles by origin, either solar, geo or human-made,” he said.

The small number of anti-neutrinos detected at Borexino, only a couple each month, helps to settle a long-standing question among geophysicists and geologists about whether our planet harbors a huge, natural nuclear reactor at its core.

Based on the unprecedently clear geo anti-neutrino data, the answer is no, say the UMass Amherst physicists.

“This is all new information we are receiving from inside the Earth from the geo-neutrino probe,” explained UMass Amherst researchers Laura Cadonati.

“Our data are exciting because they open a new frontier. This is the beginning. More work is needed for a detailed understanding of Earth’s interior and the source of its heat, with new geo-neutrino detectors above continental and oceanic crust,” she said. (ANI)

Scientists exploring possibility of using Asian herbs to fight diabetes, obesity

Washington, July 8 (ANI): A team of researchers from the University of Massachusetts Amherst and Chungbuk Oriental Medicine Center in South Korea are exploring the possibility of using Asian medicinal herbs to manage the global epidemic of Type II diabetes and obesity.

Young-Cheul Kim, a UMass Amherst assistant professor of nutrition and an expert in how fat cells develop in the body, will study molecular-level biological function of certain medicinal herbs such as the vetch, Astragalus, also known as milk vetch or huang chi.

His lab will use a well characterized fat cell differentiation model to test a number of plant-based compounds or phytochemicals for potential anti-obesity and anti-diabetes properties, first in vitro cell culture, then in whole animals and finally in humans.

He says: “Overall, we are trying to understand the cellular and molecular mechanisms underlying the development of fat cells in the body, especially by bioactive food components, with the goal to find therapeutic strategies for not only preventing chronic diseases such as obesity, cancer and heart disease, but promoting overall health.

These chronic disorders are all related to our diet, illustrating the importance of nutrition.”

Despite its use for hundreds of years in Asia to prevent or treat certain diseases, evidence for health claims of the herb Astragalus is “limited” at present, according to the U.S. National Center for Complementary and Alternative Medicine. This is partly because one herb may contain so many different active components.

Kim notes the time has come to investigate, with rigorous scientific methods, what compounds are present and how they work.

Therefore, he says: “One of the goals of our collaboration with this prestigious center of Asian medicine in Chungbuk will be to identify any biologically active ingredients.”

Kim’s lab has already shown some preliminary evidence from experiments on mouse cells that an extract of the hardy high-altitude shrub, Rhodiola, also known as “golden root”, inhibits the generation of new fat cells from precursor cells called pre-adipocytes.

It acts by interfering with the genes that determine the progression of adipogenesis, or the formation of fat, the researcher says.

His team will extend their future studies to more compounds, and explore effects in primary cultures of human cells. If replicated, studies can move on to test effectiveness in whole body systems.

Though some may be surprised by the Korean medical center’s interest in research on obesity and diabetes, Kim says these conditions have emerged as public health problems in Asia over the past two decades with the availability of fast foods and a tendency toward decreased physical activity.

“We know from immigrant epidemiologic studies that a balanced diet and exercise play a critical role in maintaining health, preventing chronic diseases and reducing the incidence of metabolic syndromes such as diabetes and obesity. Unfortunately we can now see obese children throughout Asia, and many more people with diabetes,” says Kim, who grew up in Korea.

“So the major research centers and food industry are now very interested to investigate the possible functional and beneficial roles of plants and herbs, as well as their nutritional value,” he adds. (ANI)

‘Chemical nose’ can sniff out cancer

Washington. June 23 (ANI): Researchers at the University of Massachusetts Amherst have developed a ‘chemical nose’ that can sniff out cancer.

The revolutionary tool contains an array of nanoparticles and polymers that differentiate not only between healthy and cancerous cells but also between metastatic and non-metastatic cancer cells.

Currently, detecting cancer via cell surface biomarkers has taken what’s known as the “lock and key” approach.

However, this method includes foreknowledge of the biomarker.

“Our new method uses an array of sensors to recognize not only known cancer types, but it signals that abnormal cells are present,” said chemist Vincent Rotello, who conducted the research with cancer specialist Joseph Jerry.

“That is, the chemical nose can simply tell us something isn’t right, like a ‘check engine light,’ though it may never have encountered that type before,” he added.

Further, the chemical nose can be designed to alert doctors of the most invasive cancer types, those for which early treatment is crucial.

The study conducted using four human cancer cell lines (cervical, liver, testis and breast), as well as in three metastatic breast cell lines, and in normal cells showed that the new detection technique correctly indicated not only the presence of cancer cells in a sample but also identified primary cancer vs. metastatic disease.

Rotello’s research team, with colleagues at the Georgia Institute of Technology, designed the new detection system by combining three gold nanoparticles that have special affinity for the surface of chemically abnormal cells, plus a polymer known as PPE, or para-phenyleneethynylene.

As the ‘check engine light,’ PPE fluoresces or glows when displaced from the nanoparticle surface.

The study appears in the journal Proceedings of the National Academy of Sciences online. (ANI)

Chemists develop first accurate test for arsenic in soil

Washington, April 5 (ANI): Analytical chemists have developed the first accurate test for arsenic compounds in soil, providing improved environmental and health impact assessment, and for detecting high arsenic levels in some Asian rice supplies.

The test was conducted by analytical chemist Julian Tyson and colleagues at the University of Massachusetts Amherst in the US.

In North America, arsenic is found most commonly under decks and near structures such as playground gyms made of pressure-treated wood, which is impregnated with heavy metals.

The squeezed-in chromium, copper and arsenic make wood weather-resistant and durable but they also slowly leach out into the environment, mainly soil.

The potential health impact, called by some an “environmental time bomb,” has been difficult to assess in an objective, quantitative way until now, according to Tyson and his graduate student co-author Khalid Al-Assaf, because the key arsenic compounds stick so tightly to iron oxides that they couldn’t be isolated and measured separately.

“It’s been very hard to know if this source of contamination was staying put, evaporating into the air or getting into the groundwater,” Tyson explained.

Several laboratories have long sought a soil test for arsenic, but his research team is the first to develop a procedure for isolating all the compounds of interest, including the mono- and dimethylated species in soil and accurately measuring them.

With the new procedure, chemists can now help to answer questions about whether arsenic compounds are getting into drinking water supplies, being taken up by plants, and whether soil bacteria are involved in the production of methylated compounds.

It’s already known that arsenic is easily ingested by children who touch pressure-treated wood play equipment and then put their hands in their mouths, and it’s brought into homes on pets that get into dirt under pressure-treated wood decks.

According to Tyson, earlier attempts to trace arsenic movement through the environment by sampling dog toenails were not conclusive.

The chemist added that because some bacteria in soil are able to convert arsenic to volatile products, and iron oxides can bind it tightly, the residue in the soil may not travel very far, so “we probably shouldn’t be unduly alarmed.”

Tyson and colleagues’ method for isolating the arsenic compounds from soils may be adaptable to determine arsenic concentrations in batches of rice to improve food safety. (ANI)

Soon, breastmilk test to detect early breast cancer risk

Washington, Apr 4 (ANI): Nursing mothers’ breast milk might one day help assess future breast cancer risk, say researchers.

A research team led by environmental toxicologist Kathleen Arcaro of the University of Massachusetts Amherst will be conducting a series of experiments to identify methylated genes that indicate potentially pre-cancerous changes in breast cells.

The test could show signs of elevated breast cancer risk in women at an earlier age than ever before.

Methylation pushes cells toward cancer development because they represent potential tumour sites.

Early detection of methylation in breast tissue is a key in preventing cancer.

Arcaro suggests that current detection techniques such as ductal lavage and nipple aspiration yield very few cells, only tens or hundreds rather than the millions available from collecting breastmilk.

Also, breastmilk contains what Arcaro calls “a survey of cells from all the glands in the breast”.

This significantly extends the reach of the risk assessment to many more breast tissues than other methods.

Because breast cancer in young women is rare, Arcaro says, “the main advantage many women will get from our new test based on breast milk samples will be peace of mind.”

However, those few who are at elevated risk will find it out “far, far earlier than ever before,” and the early warning should allow them to choose treatment options. (ANI)

New technique promises 10 times more computer memory

Washington, Feb 24 (ANI): Researchers have tested a new method for producing super dense, defect-free, thin polymer films, which may dramatically improve microelectronic storage capabilities such as those in computer memory sticks, generating up to 10 times more storage space.

Researchers at the University of Massachusetts Amherst and their colleagues at the University of California Berkeley designed the method.

They report how how they designed a new way to guide the self-assembly of the material used to store computer memory, layered block copolymers, and generate up to 10 times more storage space than similarly sized copolymers.

According to the researchers, they developed a defect-free method that can generate more than 10-terabit-per-square-inch copolymer where other efforts achieved at most one terabit per square inch.

A terabit is an information storage unit equal to one trillion bits.

“We can generate nearly perfect arrays over macroscopic surfaces where the density is over 15 times higher than anything achieved before,” said Thomas Russell, director of the UMass Materials Research Science and Engineering Center.

He co-led the research with Ting Xu, a member of the Department of Materials Science and Engineering at Berkeley.

“We applied a simple concept to solve several problems at once, and it really worked out,” Russell said.

The concept involved stacking atoms more closely together than previously thought possible to produce the highest density copolymer ever achieved, one capable of storing more information than previous copolymers.

The result enabled researchers to produce more densely packed troughs, which is where computer memory is stored.

“I expect this new method of producing highly ordered macroscopic arrays of nanoscopic elements will revolutionize the microelectronic and storage industries and perhaps others,” said Russell.

“This research by the teams at UMass Amerherst and Berkeley represents a significant breakthrough in the use of polymer self-assembly to create a high density of addressable locations in a thin film,” said NSF program manager William J. Brittain.

“Most significantly, the simple crystalline lattice used as the template may serve as a revolutionary step for a new generation of computer memory,” he added. (ANI)

Smallest polymer films might revolutionize microelectronic industry

Washington, Feb 22 (ANI): Scientists have come up with a new way of producing the smallest and most perfect polymer films, which might revolutionize the microelectronic and storage industries.

The team that came up with the novel method included Tom Russell of the University of Massachusetts Amherst, along with researchers at the University of California (UC) Berkeley.

They have developed a faster, more efficient way to produce defect-free thin polymer films with the smallest domains ever achieved and ordered in the densest way possible for any given size-to dramatically improve storage density.

“I expect this new method of producing highly ordered macroscopic arrays of nanoscopic elements will revolutionize the microelectronic and storage industries and perhaps others, like photovoltaics,” said Tom Russell of the University of Massachusetts Amherst.

The new technique for guiding self-assembly of block copolymers-two chemically dissimilar polymers joined together-should not only increase data storage volume, but will save months in manufacturing and open up vistas for entirely new applications, according to Russell and Ting Xu, leader of the UC Berkeley team.

“The density achievable with the technology they’ve developed could allow the contents of 250 DVDs to fit on a surface the size of a quarter, for example,” said Xu.

For the base layer, Xu, Russell and colleagues used commercially available sapphire wafers, which start out flat.

Heating them from 1300 to 1500 degrees Celsius for 24 hours causes the surface to reorganize into a sawtooth topography with an inherent orientation.

So, when a thin copolymer film layer is applied, the underlying corrugations or crystal facets guide the film’s self-assembly in a highly ordered way to form an ultradense hexagonal or honeycomb lattice.

“We can generate nearly perfect arrays over macroscopic surfaces where the density is over 15 times higher than anything achieved before,” Russell said.

“We applied a simple concept to solve several problems at once, and it really worked out. It’s really exciting,” he added.

According to Russell and Xu, theirs is the first fast, simple, robust and precise way to generate thin films containing arrays of “highly oriented, closed-packed, nanoscopic cylindrical domains that span the entire film thickness and have an exceptionally high degree of long-range lateral order.”

“This method opens the possibility for use in photovoltaics and reveals a pathway to efficient energy-harvesting devices,” said Russell. (ANI)