Tag: "record" at biology news
Molecular biology fills gaps in knowledge of bat evolution
...ory is largely unknown because of a limited fossil record
and conflicting or incomplete theories about their...id. "It also quantifies the fraction of the fossil record
that is missing for bats." The team, using DNA sequencing, analyzed data from portions of 17 nuclea...
New Clues Add 40,000 Years to Age of Human Species
...der than skulls from Herto, Ethiopia, the previous record
holders. The Kibish hominids—dubbed Omo I and Omo...d annual lake deposits, are part of the geological record
scientists study for indications of climate change. The team believes the Africa-Mediterranean corre...
Development of portable infectious disease detector
...have furtherminiaturized this sensor technology to record
rapid changes in themetabolism and signaling of individual cells. To handle such smallnumbers of cells, they have adapted a method for molding micro-channelsand valves into a material similar to that used in soft contact lenses.This has given them th...
HIV Infection Still On The Rise
...million children, are now infected with HIV, and a record
4.8 million became infected in 2003. The underlying reason for this continuing increase is socioeconomic, but the increase also represents a failure of prevention, write the authors. For instance, the search for a vaccine against HIV has so far pro...
Ice core 'dipstick' indicates West Antarctic ice has thinned less than believed
... band, researchers were able to extract an isotope record
that provided a picture of temperature and snowfall patterns near Siple Dome. The layers get thinner and thinner with depth, as more ice and snow piles up. But the thinness of the layers deposited near the end of the Last Glacial Maximum indicate the...
Devising Nano Vision for an Optical Microscope
...uccess would extend the technology’s 400-year-long record
as an indispensable imaging and measurement tool well into the expanding realm of nanotechnology. Called phase-sensitive, scatter-field optical imaging, the computer-intensive technique under development at NIST uses a set of dynamically engineered ...
Family trees of ancient bacteria reveal evolutionary moves
...?some say four ?global glaciations, and the fossil record
reflects a major shift in the number of organisms ..."We will need lots of analyses of the micro-fossil record
by serious paleobiologists to see how sound this hypothesis is," Blank said. "This time frame is one...
Scientists find fossil proof of Egypt's ancient climate
...one scrapers and blades. "The artifacts provide a record
that people were coming to the lake," said Smith. "Genetic evidence suggests that 100,000 to 400,000 years ago was a critical time in the evolution and dispersal of African hominins. Our climate data from this 130,000-year-old humid event suggest tha...
Implanted Devices Detect High-Risk Heart Failure Patients
...nsight from CRT-D devices is possible because they record
detailed data on heart function 24 hours a day. These new findings are important for two reasons, the researchers said. First, the collected information appears to more accurately identify high risk patients who would benefit from early and aggressi...
Alaskan puzzles, monitoring provide insight about North Pacific salmon runs
...from the Kvichak are similar lakes and rivers with record
production. "Our research is directed toward understanding why these runs see such different trends, by looking broadly at different systems subject to the same climate factors and constructing ecosystem conditions going back hundreds of years," Hil...
Marburg haemorrhagic fever in Angola update
...outbreak in Angola is the largest and deadliest on record
for this rare disease, which is presently showing a case fatality rate higher than 90%. For comparison, outbreaks of the closely related Ebola haemorrhagic fever have shown mortality rates ranging, according to the virus strain involved, from 53% to ...
Small species back-up giant marsupial climate change extinction claim
...he 1840s it was assumed that the palaeoenvironment record
was well established. Closer examination revealed...ent on wetter conditions disappear from the fossil record
while animals such as long-nosed bandicoots that aren't habitat specific remain." Analysis of sedim...
Scientists journey to southern Africa to unravel the secret world of elephant communication
... seismic signals," O'Connell-Rodwell explains. To record
the elephants' reactions, she and her colleagues b... waterhole. The array gave them the opportunity to record
hundreds of seismic rumbles from elephants and other visitors--the most comprehensive study of large...
Road salt affects mitigation wetlands
... salt spreading and snow melting. The data loggers record
salinity hourly. "Salt levels in the runoff wetland reach peaks that are half as salty as sea water," Silver told attendees at the North American Benthological Meeting today (May 24) at the 2005 Joint Assembly in New Orleans. "We recorded peaks duri...
Discovery clarifies role of peptide in biological clock
...N cells, a "clock in a dish." This enabled them to record
data from many cells for many days. "We found that the VIP mutants, indeed, can generate circadian rhythms, but the neurons can't synchronize to each other," Herzog said. "We showed that we could restore rhythms to the arrhythmic neurons and synchro...
A hope for oil spill bioremediation
... concluded that, probably due to the contamination record
of the past in that coast, indigenous populations had evolved to select for organisms able to grow and degrade components of crude oil. ...
Evidence of 600-million-year old fungi-algae symbiosis discovered in marine fossils
...land. The discovery also adds to the scarce fossil record
of fungi and raises new questions about lichen evolution. Xunlai Yuan, a paleontologist with the Nanjing Institute of Geology and Palaeontology; Shuhai Xiao, assistant professor of geosciences at Virginia Tech; and Thomas N. Taylor, professor of eco...
Census of Marine Life explorers surprised by diversity, density of Arctic creatures
... to fascinate and motivate us all is the chance to record
species never known before, to accurately map their range and understand their rapidly-changing habitat." Census of Antarctic Marine Life Whereas the Canada Basin is a deep, lidded bowl, relatively unstirred for thousands of years, the landmark Cen...
Community MRSA is re-emergence of 1950s pandemic, study suggests
...e has a toxin and other traits with a proven track record
for causing serious diseases in healthier and younger age groups than those currently regarded as at risk. The increased resistance to antibiotics of the community acquired MRSA clone over its 80/81 ancestor mean that there could also be other factor...
Researchers reveal secrets of flying snakes
...ogical Gardens. He positioned two video cameras to record
in stereo, enabling the 3-D reconstruction of the head, midpoint and vent coordinates of the snake throughout its trajectory. Socha found that the snake uses its ribs to change its body shape; it flattens from head to vent. The snake takes control o...
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