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Tag: "assumed" at biology news

Brain inflammation may be friend, not foe, for Alzheimer's patients

...mark of the disease. While many scientists have assumed that inflammation as a result of disease or injury...nce in the brains of Alzheimer’s patients would be assumed to be part of the problem. In the original development of his mouse, Shaftel worked closely with ...

Crammed with charged DNA, pressure rises inside virus

...may be because the packed DNA is less ordered than assumed in the calculations. ...

Massive herds of animals found to still exist in Southern Sudan

... kob in Southern Sudan,” said Marjan. “Most people assumed we would find nothing in terms of wildlife.” Fay and his colleagues decided to return to Southern Sudan to conduct new surveys as part of a 2004 Wildlife Conservation Society/National Geographic project, dubbed Africa MegaFlyover, when a team trave...

Herpes virus hijacks DNA repair process

...vates the DNA damage response. But researchers had assumed that this activation occurred because repair mechanisms were mistaking replicating viral DNA for damaged or dysfunctional cellular DNA. "Viruses sometimes structure their own DNA differently than cellular DNA," Tarakanova notes. "Many of us though...

Scientists close in on missing carbon sink

...m found that some 40 percent of the carbon dioxide assumed to be absorbed by northern forests is instead take...orbing high amounts. Conversely, scientists had assumed a large amount of carbon was coming out of the tropics and moving through the atmosphere to be absor...

Role of noise in neurons

...nnels in the brain are much larger than previously assumed ?meaning the fidelity of transmission is compromised. Neurons in the cerebral cortex of the brain can have a wiring density of up to 4km per mm3 by using incredibly thin axons as wires, with an average diameter of 0.3 micrometers (1ìm is one millio...

Alien plants attack using 'resource conservation' as weapon, researchers say

...s water, nutrients and light. Biologists have long assumed that alien species pose less of a threat in resource-poor environments because they are less able to compete with indigenous plants, which have adapted to their habitats over thousands of years. But a new study by Stanford University researchers find...

Dinosaur hearing, listening to muscle noise, quieter cubicles

... of which the wall is made. Many acousticians had assumed that the main important factor was the profile of a wind instrument's bore, the chamber where air vibrates and produces pitch. Wilfried Kausel of the University of Music and Performing Arts in Austria ( kausel@mdw.ac.at ) will present growing expe...

Study warns deep-sea mining may pose serious threat to fragile marine ecosystems

...nic activity. Until the late 1970s, scientists had assumed that life required sunlight, but the discovery of these vent communities showed that life could exist on thermal and chemical energy. Since oceans have existed, more or less, since the beginning of Earth's history, these deep sea hydrothermal vents c...

Do fruit flies have free will?

...n Brembs from the Free University Berlin. They are assumed to be input-output devices. "When scientists observe animals responding differently even to the same external stimuli, they attribute this variability to random errors in a complex brain." Using a combination of automated behavior recording and sophi...

UCLA study uncovers clues for why Graves' disease attacks the eyes

...tem and lead the attack in any immune response, we assumed that they played a key role in this antibody’s development." The team tested GD patients?blood for the antibody and compared their findings to samples from healthy people, with about 100 subjects in each group. The new antibody was found in alm...

Glucose triggers brain cell death in rats after hypoglycemic coma

... reactive forms of oxygen. Previously, it had been assumed that oxidative stress in neurons was initiated primarily by mitochondria, which process oxygen for energy within cells. The paper appears in the April 2007 issue of the Journal of Clinical Investigation. In their study, the researchers subject...

Female Antarctic seals give cold shoulder to local males

...sive and father more offspring. It had long been assumed that the females were passive, simply mating with their nearest male. However, using paternity tests, the scientists demonstrated that only a quarter of the females conceived to their nearest male. Dr Joe Hoffman, at the Department of Zoology, Uni...

Misclassified for centuries, medicinal leeches found to be 3 distinct species

...ssified for centuries. Until now, the leeches were assumed to be the species Hirudo medicinalis, but new research reveals they are actually a closely related but genetically distinct species, Hirudo verbana. The study also shows that wild European medicinal leeches are at least three distinct species, not ...

Anthrax attack posed greater potential threat than thought

...e new study of the event, however, people in areas assumed to be at minimal risk of exposure showed immune responses suggesting they had been exposed. The researchers, Denise L. Doolan, PhD, MPH, Daniel A. Freilich, MD, and coworkers of the Naval Medical Research Center, Silver Spring, MD, and elsewhere,...

Liver regeneration may be simpler than previously thought

...g cells behave like embryonic ones, as is commonly assumed for other organs. New processes may explain why the liver is so uniquely capable of renewal and repair after injury, the scientists thought. Karp's team considered two samples of mice. The first consisted of embryonic mice at various stages of dev...

Ebola outbreaks killing thousands of gorillas and chimpanzees

...aced in the late 1990s, outbreak amplification was assumed to be through "massive spillover" from some unknown reservoir host. The new study, conducted by researchers from the Max Planck Institute for Evolutionary Anthropology, Cambridge University, and Stony Brook University at three sites in northern Repub...

Scientists map key landmarks in human genome

...e expression of a nearby gene. It has long been assumed that these factors can't bind to a stretch of DNA that is bound by a nucleosome; they can, however, attach to DNA "linkers" between two nucleosomes. With their new method, Fisher's group found that transcription factor binding indeed typically occurs...

Birds found to plan for the future

...ition at the University of Cambridge. “People have assumed that animals only have a concept of the present, but these findings show that jays also have some understanding of future events and can plan for future eventualities. The western scrub-jays demonstrate behaviour that shows they are concerned both ab...

Widely used iron nanoparticles exhibit toxic effects on neuronal cells

... forms and iron oxide nanoparticles were generally assumed to be safe," said Sungho Jin, a professor of materials science at UCSD and senior author of a paper to be published in Biomaterials. The paper is currently available on the journal's website. "However, there are recent reports that this type of nanop...

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