Showing posts with label science news. Show all posts
Showing posts with label science news. Show all posts

Skipping Breakfast Increases Risk Of Heart Attack

10:33 AM
Yet another reason to eat breakfast in the morning–doing so may prevent you from having a heart attack.
Skipping Breakfast Increases  Risk Of Heart Attack
Skipping Breakfast Increases  Risk Of Heart Attack

A recent study of men aged 45-82 who regularly skipped breakfast demonstrated a 27% increase in risk of having a heart attack or developing coronary artery disease compared with those who ate breakfast daily. Although the research was done in older men, researchers believe the results may likely apply to the broader population as a whole.

It is important to note that this was an observational study, and cannot prove a cause and effect relationship between consumption of breakfast and risk of heart attack.

The research was published in the Journal, Circulation, July 22.

The researchers evaluated 27,000 men regarding their daily eating habits in 1992. Based on their results, 13% of the respondents stated that they routinely skipped breakfast. These men were all at least 45 years of age and had professional careers. Over the next 16 years, 1,527 suffered a heart attack-fatal or nonfatal.

After accounting for other variables such as smoking, alcohol use, diet, high blood pressure and diabetes, this equated to a 27% percent added risk for skipping breakfast.



More details of the study revealed that younger men were more likely to skip breakfast than older men. Other factors associated with skipping breakfast included smoking, drinking alcohol regularly, working full time, being unmarried, and being less physically active overall.

Of note, previous research has shown a relationship between skipping breakfast and developing high blood pressure, obesity, and diabetes—all a precursor to the development of the dangerous metabolic syndrome- an important risk for heart disease.

What distinguishes the current study is the role of skipping breakfast and its future relationship to having a heart attack.

So why does skipping breakfast lead to an increased risk for having a heart attack?

Researchers believe that people who skip breakfast tend to eat larger, more calorically dense meals later in the day, often late into the night, to compensate for the lack of an early morning meal. They also tend to eat more meals later into the night.

Eating later into the night–the case for a small number of men in the study who awoke after initally going to sleep– was associated with a 55 % increase in the incidence of developing coronary artery disease. The overall risk, however, was perceived to be small, since only a minority of men in this study exhibited this behavior.

Ultimately, however, this means fewer hours in the day to process additional, more calorically dense foods, which lead to higher levels of blood sugars and more intense and frequent insulin spikes. This process is thought to be a precursor to premature development of coronary artery disease, more commonly termed atherogenesis.

One drawback of the study was that researchers did not ask what participants actually ate for breakfast. So whether they ate sausage, biscuits with gravy, or a big stack of buttery pancakes was never investigated. The question is whether eating fat laden, highly caloric breakfast foods is better than skipping breakfast altogether.

The issue of when you eat, as well as the content of what you eat is currently a topic of debate. It is unclear what is more important, but it is likely a combination of both factors that is pivotal.

The bottom line is that people who eat breakfast generally eat fewer calories throughout the day, and are usually healthier than those who do not eat breakfast.

According to data from the NPD group, as many as 10% of US adults–30 million people–routinely skip breakfast.

The take home message is that eating breakfast is an important component of a healthy lifestyle.

If results of the research examined here can be demonstrated in women, as well as among other races and ethnic groups, then eating breakfast may become an important preventive health measure for the public.


Of note, a January, 2013 New England Journal of Medicine article published this year called into question the concept that eating breakfast actually reduces obesity, examining various myths associated with gaining weight. The article evaluated data from two specific studies that demonstrated that breakfast eaters did not have a reduction in rates of obesity.

Brain ultrasound to treat depression, anxiety

2:42 PM
Sending ultrasound waves to specific areas of the brain can alter patients' moods, a new study has found.

The discovery by University of Arizona researchers has led them conduct further investigations with the hope that this technique could one day be used to treat conditions such as depression and anxiety.
Brain ultrasound to treat depression, anxiety

Dr. Stuart Hameroff, professor emeritus of the UA's departments of anesthesiology and psychology and director of the UA's Center for Consciousness Studies, is lead author on the first clinical study of brain ultrasound.

Hameroff became interested in applying ultrasound to the human brain when he read about a study by colleague Jamie Tyler at the Virginia Polytechnic Institute, who found physiological and behavioral effects in animals of ultrasound applied to the scalp, with the waves passing through the skull.

Hameroff knew that ultrasound vibrates in megahertz frequencies at about 10 million vibrations per second, and that microtubules, protein structures inside brain neurons linked to mood and consciousness, also resonate in megahertz frequencies. Hameroff proposed testing ultrasound treatment for mood on human brains.

"I said to my anesthesiology colleagues, 'we should try this on chronic pain patient volunteers'," he said.

His colleagues respectfully suggested he try it on himself, first. Hameroff acquiesced.

After 15 seconds with an ultrasound transducer, a standard ultrasound imaging device, placed against his head, Hameroff felt no effect.

"I put it down and said, 'well, that's not going to work.' And then about a minute later I started to feel like I'd had a martini," he said.

His mood was elevated for the next hour or two, Hameroff said.

Aware that his experience could be a placebo effect, an imagined effect derived from his expectation to feel a change, Hameroff set out to properly test the treatment with a clinical trial.

With research committee and hospital approval, and patient informed consent, Hameroff and his colleagues applied transcranial ultrasound to 31 chronic pain patients at The University of Arizona Medical Center-South Campus, in a double blind study in which neither doctor nor subject knew if the ultrasound machine had been switched on or off.

Patients reported improvements in mood for up to 40 minutes following treatment with brain ultrasound, compared with no difference in mood when the machine was switched off.

The researchers confirmed the patients' subjective reports of increases in positive mood with a Visual Analog Mood Scale, or VAMS, a standardized objective mood scale often used in psychological studies.

The discovery may open the door to a possible range of new applications of ultrasound in medicine.

The study is published in the journal Brain Stimulation.

Gold on Earth must have come from colliding dead stars

10:24 PM
NEW DELHI: All the gold on Earth must have come from colliding dead stars, scientists have suggested after studying a gamma ray burst (GRB) that happened when two neutron stars collided on June 3 rdthis year.

Gold on Earth must have come from colliding dead stars

It was known that gold must have cosmic origins like many of the heavier elements. But gold is so heavy that it could not be created even in stars, like iron. It needed a cataclysmic event for gold to be forged.

Scientists at the Harvard-Smithsonian Center for Astronomy (CfA) observing the gamma ray burst last month found that a unique glow that persisted for days at the GRB location potentially signifies the creation of substantial amounts of heavy elements - including gold. The gamma ray burst was a death scream of two neutron stars colliding and merging, some 3.9 billion light years away.

Neutron stars are super-dense stars made of just neutrons. They are born after a star explodes in a supernova. A neutron star is said to have a density like a Boeing 747 compressed to the size of a grain of sand.

"We estimate that the amount of gold produced and ejected during the merger of the two neutron stars may be as large as 10 moon masses - quite a lot of bling!" says lead author Edo Berger of the CfA in a statement.

Although the gamma rays disappeared in just one-fifth of a second, a slowly fading glow dominated by infrared light persisted for some more time. Its brightness and behavior didn't match a typical ""afterglow,"" which is created when a high-speed jet of particles slams into the surrounding environment.

Instead, the glow behaved like it came from exotic radioactive elements. The neutron-rich material ejected by colliding neutron stars can generate such elements, which then undergo radioactive decay, emitting a glow that's dominated by infrared light - exactly what the team observed.

"We've been looking for a 'smoking gun' to link a short gamma-ray burst with a neutron star collision. The radioactive glow from GRB 130603B may be that smoking gun," explains Wen-fai Fong, a graduate student at the CfA and a co-author of the paper.

The team calculates that about one-hundredth of a solar mass of material was ejected by the gamma-ray burst, some of which was gold. By combining the estimated gold produced by a single short GRB with the number of such explosions that have occurred over the age of the universe, all the gold in the cosmos might have come from gamma-ray bursts.

"To paraphrase Carl Sagan, we are all star stuff, and our jewelry is colliding-star stuff," says Berger.

The team's results have been submitted for publication in The Astrophysical Journal Letters and are available online.

Inadequate sleep during pregnancy can lead to complications

6:01 PM
Los Angeles: Scientists have shown that inadequate sleep during pregnancy can lead to complications and hinder normal immune processes, says a study.
Inadequate sleep during pregnancy can lead to complications

Women with depression are more likely than non-depressed women to suffer from disturbed sleep and adverse pregnancy outcomes.

Scientists at the University of Pittsburgh School of Medicine conducted the research and the study was published in the journal "Psychosomatic Medicine".

"Our results highlight the importance of identifying sleep problems in early pregnancy, especially in women experiencing depression, since sleep is a modifiable behaviour," said Michele Okun, Ph.D., assistant professor of psychiatry at Pitt`s School of Medicine and lead author of the report. "The earlier that sleep problems are identified, the sooner physicians can work with pregnant women to implement solutions."

There is a dynamic relationship between sleep and immunity, and this study is the first to examine this relationship during pregnancy as opposed to postpartum," added Dr. Okun.

IANS 

Pee power to charge mobile phones

10:06 PM
LONDON: Pee power! In a world first, UK scientists claim to have developed a novel method to charge mobile phones - using human urine. 


 scientists claim to have developed a novel method to charge mobile phones - using human urine.
Scientists working at the Bristol Robotics Laboratory have described the "breakthrough" finding of charging cell phones using urine as the power source to generate electricity. 

"We are very excited as this is a world first, no-one has harnessed power from urine to do this so it's an exciting discovery. Using the ultimate waste product as a source of power to produce electricity is about as eco as it gets," Dr Ioannis Ieropoulos from University of the West of England (UWE), Bristol, an expert at harnessing power from unusual sources using microbial fuel cells, said. 

"One product that we can be sure of an unending supply is our own urine. By harnessing this power as urine passes through a cascade of microbial fuel cells (MFCs), we have managed to charge a mobile phone. The beauty of this fuel source is that we are not relying on the erratic nature of the wind or the Sun, we are actually re-using waste to create energy," said Ieropoulos. 

He said so far the microbial fuel power stack that scientists have developed generates enough power to enable SMS messaging, web browsing and to make a brief phone call. 

"Making a call on a mobile phone takes up the most energy but we will get to the place where we can charge a battery for longer periods. The concept has been tested and it works - it's now for us to develop and refine the process so that we can develop MFCs to fully charge a battery," he said. 

The Microbial Fuel Cell (MFC) is an energy converter, which turns organic matter directly into electricity, via the metabolism of live microorganisms, researchers said. 

Essentially, the electricity is a by-product of the microbes' natural life cycle, so the more they eat things like urine, the more energy they generate and for longer periods of time; so it's beneficial to keep doing it, they said. 

The electricity output from MFCs is relatively small and so far we have only been able to store and accumulate these low levels of energy into capacitors or super-capacitors, for short charge/discharge cycles. 

This is the first time we have been able to directly charge the battery of a device such as a mobile phone and it is indeed a breakthrough, researchers said. 

Scientists believe that the technology has the future potential to be installed into domestic bathrooms to harness the urine and produce sufficient electricity to power showers, lighting or razors as well as mobile phones. 

The study was reported in the Royal Society of, 'Chemistry Journal of Physical Chemistry Chemical Physics'.

Arctic may become ice-free by 2054

8:35 PM
Arctic may become ice-free for several months of the year, starting sometime during the years 2054 to 2058, a combined team of researchers from the US and China has predicted.
Using a climate simulation tool, scientists have projected that the Arctic will become September ice-free sometime after the next 40 years.
Arctic may become ice-free by 2054
Arctic may become ice-free by 2054

Ice-free in this context refers to a time period during any given year - generally arriving in September after withstanding the heat of summer, researchers said.
Not long after scientists began to recognise that the planet has been heating up, many began to realise that a warmer planet would mean warmer temperatures in the Arctic – enough warming and the Arctic would eventually become ice-free during part of the year, website 'Phys.org' reported.
Researchers used a climate modal called Coupled Model Intercomparison Project Phase 5 (CMIP5).
One of the factors that the newest version of CMIP5 takes into consideration is ice thickness - the thinner the ice the faster it will melt - recent research suggests ice in the Arctic is growing thinner, researchers said.
It also uses various factors in attempting to simulate ice extent – ice covering less area to start with – means less will be left at the end of summer.
CIMP5 also allowed the researchers to make comparisons between historical projections and what actually transpired in the real world. As one example, the team gave the simulation data for the time period 1979 through 2011.
By running simulations from various models and comparing them, the team was able to come up with a scenario that best represented what actually occurred. They were able to use the same constraints to project most accurately what might occur in the future.
To help improve accuracy, the team also input data into the model that took into account the fact that more sea ice tends to mean ice will be around longer and vice-versa and applied it using data from the years 2007 to 2012.
The overall result of their simulations gave rise to the same general prediction¿that the Arctic will be ice-free for several months of every year, starting sometime during the years 2054 to 2058.
The study was published in journal Proceedings of the National Academy of Sciences (PNAS).

Sea levels may rise by 2.3 meters for each degree celsius of global warming

1:41 PM
Sea levels may rise by about 2.3 meters for each degree celsius of global warming within the next 2,000 years, an international team of researchers has said.
Sea levels may rise with global warming
Sea levels may rise with global warming

While thermal expansion of the ocean and melting mountain glaciers are the most important factors causing sea-level changes today, the Greenland and Antarctic ice sheets will be the dominant contributors within the next two millennia, according to the team's findings published in the US journal Proceedings of the National Academy of Sciences.

Half of that rise might come from ice loss in Antarctica, which is currently contributing less than 10 percent to the global sea-level rise, Xinhua cited the report as saying.

"We're confident that our estimate is robust because of the combination of physics and data that we use," Anders Levermann, lead author of the study and research domain co-chair at the Potsdam Institute for Climate Impact Research based in Germany, said in a statement.

The team said the study is the first to combine evidence from early Earth's climate history with comprehensive computer simulations using physical models of all four major contributors to long-term global sea-level rise.

Experts from the US, Spain, Canada and Austria also contributed to the research.

If global mean temperature rises by four degrees celsius compared to pre-industrial times, which is projected to happen within less than a century, the Antarctic ice sheet will contribute about 50 percent of sea-level rise over the next two millennia, the team said.

Greenland will add another 25 percent to the total sea-level rise, while the thermal expansion of the oceans' water, currently the largest component of sea-level rise, will contribute about 20 percent.

The contribution from mountain glaciers will decline to less than five percent, mostly because many of them will shrink to a minimum, the team added.

"Continuous sea-level rise is something we cannot avoid unless global temperatures go down again," said Levermann.

"Thus we can be absolutely certain that we need to adapt ... it is inevitable and therefore highly relevant for almost everything we build along our coastlines, for many generations to come."
 
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