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Tag: "magnetic" at biology news

Anticipation plays a powerful role in human memory, brain study finds

...y volunteers using a technique known as functional magnetic resonance imaging, which produces high-contrast images of human tissue. They began by showing the volunteers two kinds of signals. One was neutral, but the other indicated that some type of gruesome picture was soon to follow, such as explicit photos...

How the brain weaves a memory

...een, as their brains were scanned using functional magnetic resonance imaging (fMRI). This technique involves using harmless radio waves and magnetic fields to measure blood flow to brain regions, which reflects brain activity. As their brains were s...

Memories: It's all in the packaging, scientists say

...lar experience. In experiments using functional magnetic resonance imaging (fMRI), the scientists were able to view what happened in the brains of subjects when they experienced an event made up of multiple contextual details. They found that participants who later remembered all aspects of the experience,...

Fast test for low blood flow in dogs detects early heart trouble

...also positron electron tomography (PET) imaging or magnetic resonance imaging," he says. "The new technique could also help eliminate many unnecessary, invasive catheterization procedures when there is no underlying blockage, or become a practical test to verify if treatments with drugs therapies, surgica...

Nanoparticle assembly enters the fast lane

...s of nanotechnology, from optics to electronics to magnetic materials," said the study's lead author Mathew Maye, a Brookhaven chemist. Maye is part of a team of interdisciplinary scientists from Brookhaven's new Center for Functional Nanomaterials (CFN) and the biology department. The researchers found a way...

U-M researchers use nanoparticles to target brain cancer

...or. Iron oxide is a contrast agent used to enhance magnetic resonance imaging, or MRI. "Photofrin goes into tumor blood vessels and collapses the vasculature, which then starves the tumor of the blood flow needed to survive. The problem with free photofrin therapy is that it can cause damage to healthy tis...

New dyslexia theory blames 'noise'

...Lu, who is testing this hypothesis with functional magnetic resonance imaging trials. Lu and his collaborators interpret the new results as a rejection of the "magnocellular hypothesis" - named for a type of neuron involved in processing fast visual information - that influenced dyslexia research for decad...

Brain regions do not communicate efficiently in adults with autism

...ngs support several other studies using functional magnetic resonance imaging and positron emission tomography, both of which gauge brain activity by measuring blood flow. Post-mortem studies also suggest impairments in communication at the level of individual brain cells. This over and under abundance ...

Altered perception of reward in human cocaine addiction

...y monitoring their brain activity using functional magnetic resonance imaging (fMRI) and/or recordings of event-related potentials (ERP). In one study, subjects were given a monetary reward for their performance on an attention task. Subjects were given one of three amounts (no money, one cent, or 45 cents...

Scientists get best look ever at water-life connection

...u a different answer than someone who uses nuclear magnetic resonance and so on." "My feeling is that there is no real controversy -- everybody is just looking at the same answer from different angles," he added. The answer, revealed in Zhong's lab: water molecules do move fast on their own, but they slow d...

Pleasure and pain: Study shows brain's 'pleasure chemical' is involved in response to pain too

...earchers also scanned each volunteer's brain using magnetic resonance imaging (MRI) in order to create a precise map of the brain's structure, and combined that with their PET scans to find the exact areas of dopamine activity. The volunteers answered questions from two standardized questionnaires repeate...

Paramecia adapt their swimming to changing gravitational force

...ssee, Fla. The organisms are less susceptible to a magnetic field than plain water is, so the magnetic field generated inside the vial "pulls" harder on the water than on the cells. If the field is pulli...

Brains can recover from alcoholic damage but patients should stop drinking as soon as possible

...ciences. The patients?brains were scanned using magnetic resonance imaging (MRI) and proton MR-spectroscopy upon admission and after short-term sobriety. Only the patients that managed to abstain from alcohol without receiving any psychotherapeutic medication were included in the study, and those with seco...

Reading Shakespeare has dramatic effect on human brain

... using magnetoencephalography (MEG) and functional magnetic resonance imaging (FMI) to test which areas of the brain are most affected and the kind of impact it could have in maintaining healthy brain activity. Professor Davis added: "This interdisciplinary work is good for brain science because it offers p...

Emotional control circuit of brain's fear response discovered

...ain, using a high-resolution version of functional magnetic resonance imaging (fMRI). The standard Stroop test asks participants to name the ink color of a printed color word. Performance is typically worse if word and color are incongruent (e.g., YELLOW printed in red ink) than when the two attributes a...

Researchers reveal mystery of bacterial magnetism

...aturally magnetic. Their description of how being magnetic "helps" the bacteria is reported in the August 200...is that they naturally grow strings of microscopic magnetic particles called magnetosomes. When placed in a magnetic field, the bacteria align like tiny swimmi...

New evidence of early horse domestication

... with instruments to map out subtle electrical and magnetic irregularities in the soils. With this they were able to identify the locations of 54 pit houses and dozens of post moulds where vertical posts once stood. Some of the post moulds were arranged circularly, as would be most practical for a corral. N...

Elasticity imaging identifies cancers and reduces breast biopsies

...ndard breast cancer screening exam, screening with magnetic resonance imaging (MRI) or ultrasound may be more effective for high-risk patients or women with dense breast tissue. MRI and ultrasound depict more breast lesions than mammography but have low specificity, meaning they are less effective at distingu...

Smoking changes brain chemistry

...in Germany. Dr. Gür and colleagues used proton magnetic resonance spectroscopy (MRS) to study 21 men and 22 women, age 21 to 59, in a smoking cessation program two weeks after quitting and again six months later. Patients were encouraged to use nicotine patches during the initial six weeks of smoking cess...

MIT nanoparticles may help detect, treat tumors

...cancerous tumors, creating masses with enough of a magnetic signal to be detectable by a magnetic resonance imaging (MRI) machine. The work appears as the cover feature in the May issue of Angewand...

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