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Tag: "magnetic" at biology news

Where we change our mind

...bjects' brains were being scanned using functional magnetic resonance, the researchers "placed" the subjects i...ified goal. Functional MRI involves using harmless magnetic fields and radio waves to image blood flow in brain regions, which reflects activity. Importantly, ...

The brain's motivation station

...they scanned the subjects' brains using functional magnetic resonance imaging. In this technique, harmless magnetic fields and radio waves are used to detect regions of higher blood flow in the brain, which reflects ...

Brain's 'gambling circuitry' identified

...at, when performed by humans undergoing functional magnetic resonance imaging (fMRI) of their brains, distingu...s of the task. In fMRI, harmless radio signals and magnetic fields are used to measure blood flow in brain regions, which reflects activity in those regions. ...

Pure novelty spurs the brain

...the subject's brains were scanned using functional magnetic resonance imaging--they were shown a series of ima...y novel image. In fMRI, harmless radio signals and magnetic fields are used to measure blood flow in brain regions, which reflects activity in those regions. ...

NYU researchers decorate virus particles, showing potential to enhance MRI capabilities

...icles--a process that has the potential to improve magnetic resonance imaging (MRI) techniques. Their results are reported in the latest issue of Nano Letters. The study was conducted jointly by NYU's Department of Chemistry and the Department of Radiology at the NYU School of Medicine. The study is part of ...

Carnegie Mellon researchers discover key deficiencies in brains of people with autism

...IQs. In one study, the researchers used functional magnetic resonance imaging (fMRI) to view which parts of the brain were activated in people with autism compared to a control group of normal participants while completing the Tower of London task. In a Tower of London task, participants must -- in a set numb...

Surprise finding for stretched DNA

...rkeley used a combination of microscopic beads and magnetic tweezers to observe that when a DNA molecule is stretched, it actually begins to overwind. This overwinding continues until the force being applied to stretch the DNA exceeds about 30 picoNewtons. (One picoNewton is about a trillionth the force requi...

Light guides flight of migratory birds

...ons, including the Sun, star patterns, the earth's magnetic field, and sky polarized light patterns. To avoid ...able to demonstrate that the birds calibrate their magnetic compass based on polarized light patterns at sunset and sunrise. The research appears in the Aug. ...

Autistic brain has fewer neurons for processing emotion

...he amygdala. Paradoxically, past research using magnetic resonance imaging with children has shown that the amygdala in young males with autism is abnormally large in volume due to precocious maturation. "It is somewhat surprising, therefore, that there are ultimately fewer neurons in the autistic amygdala...

Magnetism and mimicry of nature hold hope for better medicine, environmental safety

...perhydrophobic surfaces, but the introduction of a magnetic field produced by injecting tiny magnetic particles into the droplets keeps the ball from rolling off the surface. This allows for the fluid...

Device effective in zapping the pain out of migraines

...ent through a metal coil, which creates an intense magnetic field for about one millisecond. This magnetic pulse, when held against a person's head, creates an electric current in the neurons of the brain, i...

New MRI technique quickly builds 3-D images of knees

A faster magnetic resonance imaging (MRI) data-acquisition technique...will cut the time many patients spend in a cramped magnetic resonance scanner, yet deliver more precise 3-D images of their bodies. Developed at the Universit...

New tool tracks brain development in babies

...ognosis." The researchers used 'diffusion tensor' magnetic resonance imaging (MRI), which depicts the diffusion, or displacement, of water molecules through tissue. Ischemia results in tissue changes that are visible with diffusion tensor imaging at least two to three hours before they can be seen on convent...

In-home sensors spot dementia signs in elderly

... motion sensors placed in every room, door-mounted magnetic contact sensors, and wireless transceivers that sent the data to a computer in the home. The scientists then determined the number of times the sensors fired each minute during 24-hour blocks of time to create an overall activity level score for each...

Memory loss affects more of the brain than previously thought

..., used a special, high-field- strength, functional magnetic resonance imaging (fMRI) scanner to study the brai...archers used 4-Tesla fMRI, which has a very strong magnetic field, to observe the brain activity of 20 elderly patients with amnestic MCI and 20 age-matched con...

New MRI technique shows emphysema in asymptomatic smokers

...y the National Institutes of Health, details a new magnetic resonance imaging (MRI) technique that appears to be much more sensitive to lung changes than even the current modality of choice, computed tomography (CT). "With this technology, we have shown that it is possible to measure the severity of emphysem...

The critical importance of mangroves to ocean life

... Brazil, using natural carbon isotopes and nuclear magnetic resonance spectroscopy--an established and common technique for determining the structure of organic compounds--to determine that mangroves are indeed a main source of dissolved organic carbon in the open ocean. In total, they concluded that the carb...

Anti-inflammatory drug's potentially deadly side effect found to be rare

...ents at 485 sites around the world. Clinical data, magnetic resonance imaging brain scans and cerebrospinal fluid were collected for analysis. Organizers sent guides for evaluation to local neurologists, who evaluated patients and either sent the results to a central database if they suggested little chance...

Imaging study links key genetic risk for Alzheimer's disease to myelin breakdown

...on-invasive evaluation of myelin breakdown through magnetic resonance imaging (MRI) may prove useful in assessing treatments for preventing the disease. "Myelination, a process uniquely built up in humans, arguably is the most important and most vulnerable process of brain development as we mature and age. T...

UF scientists trace origin of shark's electric sense

...wise, sharks are widely thought to use the Earth's magnetic field for navigation, enabling them to swim in precise paths across large expanses of featureless ocean, Cohn said. "If you think of this in the big picture of evolution of sensory systems, such as olfaction, hearing, vision and touch, this shows sh...

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