Tag: "magnetic" at biology news

Fall Meeting: Updated Press Conference Schedule

...oulders. The MAG team is continuing to find strong magnetic anomalies that are "fossil" in origin and occur much of the planet. The team has evidence that strong density waves in the atmosphere are stationary and may be related to topographic forcing despite the great altitude at what they are being detected....

Study Associates Asteroid Or Comet Impact With Extinctions In Argentina

...rgon atomsin the glass, and by comparing the magnetic readings of the glass layer topublished records of magnetic-field changes over the eons, the researchers date theglass as 3.3 million years old, just prior to the extinctions. Using research by other scientists that compared heavy...

Biochemist At University Of Georgia Describes Structure Of Important Cell Proteins For The First Time

...sbeen described, but presently no x-ray or nuclear magnetic resonance structuresare available for these structures in yeast, so Lipscomb and her colleagues used several techniques, including infrared spectroscopy, tostudy the proteins. "Our results suggest that v-SNAREs and t-SNAREs from yeast are h...

Bones of Crocodile-like Beasts Tell Tale of Global Warming

...," says Tarduno, a geophysicistwho studies Earth's magnetic field. "We were walking along a ridge, and wespotted a layer between the brown volcanic rocks and the black marine shale.From a distance we knew that these rocks represented an environment we hadn'tseen before. Once we reached them, we realized these...

American Heart Association Announces Top 10 Research Advances For 1998 -- Gene Therapy Among The List

...his year scientists described research showing how magnetic resonance imaging (MRI) can detect plaque obstructions that are prone to rupture in the carotid artery, the blood vessel in the neck that supplies blood to the brain, and the thoracic aorta, one of the largest blood vessels that carries blood from th...

Vibrating Cells Could Be The Ultimate In Noninvasive Screening

...teraction between ultrasonic vibrations and strong magnetic fields to map thedielectric properties of the body...and. Wen hopes his HEI will complement magnetic resonance imaging (MRI) whichuses nuclear magnetic resonance to produce tissue density maps of the b...

New Clues To Evolution Of Human Brain

...ns of the Royal Society of London. ( * Functional magnetic resonance imaging (fMRI) is based on the fact that neuralactivity causes an increase in blood flow, which in turn increases bloodoxygenation. The technology maps the brain by charting the relative increase inoxygenated hemoglobin while researchers co...

Gene Variant May Hasten Silent Strokes, Debilitating Stroke Or Alzheimer's

...and Blood Institutes Twin Study. Researchers used magnetic resonance imaging(MRI) to determine the study participants who had silent strokes, abnormalitiesin the white matter of the brain -- called white matter hyperintensities -- orsmaller brains. "The difference between using MRI and not using MRI ...

Oregon Scientists Discover A Second Blood-Brain Barrier; Important Finding For Patients With Brain Cancers And Neurological Disorders

...diology journal also pointto problems with current magnetic resonance imaging. Blood-brain barrierdisruption relies on MR imaging to assess the distribution of iron particlesthroughout the brain hemisphere. However, MR images cannot show incorporation ofthese agents at the cellular level. In other words, the ...

UI Laboratory Develops Procedure To Study DNA Replication

...an extract from human cells. Theresearchers attach magnetic beads to the DNA molecules and use a magnet toisolate the molecules and associated replication proteins. The researchers canthen manipulate the extracted DNA and add specific replication proteins in acontrolled manner to understand the mechanics of D...

Study Bolsters Theory Of Plant Nutrients Trapped In Soil

... highly visible in nuclear magnetic resonance (NMR)data. The more common isotope of nitrogen in the air andsoil is nitrogen-14, Hatcher explained, but nitrogen-15 was an appropriate substitute because plants can...

Fullerene-Based Materials Clear From Tissue, Go To The Bone

...e in medical applications such asnuclear medicine, magnetic resonance imaging (MRI) and drug delivery. Using a rugby-shaped ball of a C82 fullerene containing radioactiveholmium atoms, Rice chemist Lon Wilson and graduate student Dawson Cagle createda radiotracer similar to those that doctors use to i...

Unprecedented View Of RNA Structure Captured

...of Health also failedbecause the data from nuclear magnetic resonance experiments could not beinterpreted for an RNA of the relatively large size that Draper had chosen tostudy. Next, a post-doctoral student in his lab, Graeme Conn, offered to grow crystalsof the RNA alone. That effort also failed, but then C...

UCSF-Led Team Offers New Insight Into Neurological Basis Of Dyslexia

...netoencephalographic brain imaging, which measures magnetic fieldfluctuations generated by spatially localizable human brain activity withmillisecond precision. In these studies, the UCSF team focused on the activity generated by the rapidlysuccessive sounds evoked from the "primary" auditory cortical areas...

Magnetic Fluids More Complex Than Previously Thought

...rdinarily,carbonyl is non-magnetic, but it becomes magnetic when exposed to amagnetic field, a characteristic ...scientists call paramagnetic. "In the absence of a magnetic field, these particles are randomly dispersedthroughout the liquid," says chemical engineering gradu...

A sharper look at the brain

...sthetizedmonkeys. The fMRI technique uses a strong magnetic field to detect brain regions whichare active and ...mobilized in anupright, seated position inside the magnetic resonance tube with the aid ofbandages and supports. Special measuring signals scan the brain one "s...

Remarkable results from a new observatory

...ingle frog cell, a Xenopus oocyte, inside anuclear magnetic resonance microscope imager. This type of frog cell has beenwidely used by scientists for many decades because it shares numerous commontraits with human cells. The NMR imager works very much like a magneticresonance imaging unit at a modern hospit...

Environmental Health Institute report concludes evidence is 'weak' that electric and magnetic fields cause cancer

...ancer and other human disease fromthe electric and magnetic fields (EMF) around power lines is "weak." ...applies to the extremely low frequencyelectric and magnetic fields surrounding both the big power lines thatdistribute power and the smaller but closer electric...

Magnetic field exposure associated with childhood leukemia

...for SickChildren have found an association between magnetic field exposures inresidences and the risk of devel...CCC), shows that children with higher exposures to magnetic fields inresidences are two to four times more likely to develop leukemia compared tochildren who ar...

Target for cystic fibrosis drugs found

...ert Mildvan, Ph.D., used atechnique called nuclear magnetic resonance spectroscopy (NMR) todetermine, or "see," the structure of the two protein fragments. The NMRstudies clearly showed the mutant, 25 amino acid segment in poorlystructured, random shapes, and the normal segment in what senior researcherPeter ...

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