Tag: "temperature" at biology news
Limited climate tracking in European trees despite 10,000 years of postglacial warmth
...e. In the coming century, the global mean surface temperature
is expected to rise an unprecedented 1.4 to 5.8C. Given the limited climate-tracking exhibited by European tree species during the past 10,000 years, the authors warn that we should expect most of them to be unable to track such dramatic climate chan...
New research shows that the seasons may be involved in onset of menopause
...cted by climatic conditions such as length of day, temperature
and humidity losing their ability for cyclic renewal. "Because of the imbalance of these factors in pre-menopause, the process eventually culminates in a point where it stumbles into irrecoverable ovarian failure. Length of day is likely to be only ...
Continents played key role in collapse and regeneration of Earth's early greenhouse, geologists say
... out light; both caused further cooling, perhaps a temperature
drop of 40 to 50 degrees Celsius. Eventually, abou...lect samples that will allow them to determine the temperature
of this time interval, about 2.6 to 2.7 billion years ago, to get a better idea of how hot Earth got...
Unexpected changes in Earth's climate observed on the dark side of the moon
... only part of the story, since the Earth's surface temperature
is determined by a balance between sunlight that warms the planet and heat radiated back into space, which cools the planet," said Palle. "This depends upon many factors in addition to albedo, such as the amount of greenhouse gases (water vapor, carb...
Physics tip sheet #42
...ng Ketterle of MIT will report on a new record-low temperature
of less than one nanokelvin, the conversion of ultracold sodium atoms into molecules, and experiments with atom chips where the magnetic field of miniature wires is used to manipulate ultracold atoms (H1 2). Tin-Lun (Jason) Ho of Ohio State will disc...
Stem cells toward sperm cells and back again
...stem cells can be turned on or off by changing the temperature
around them. In experiments to examine what happen...turned in flies allowed to "recover" at the cooler temperature
of 18 degrees Celsius (about 64 degrees Fahrenheit) for two days after spending two days at the sign...
Earth, sky tapped in unique global climate change study
...osystem where native plants must react to rain and temperature
extremes along a dusty, winding road under an intricate, watchful plan of three Texas Agricultural Experiment Station scientists. Thick white plastic stretches over 14-foot tall galvanized steel arches like giant, protective umbrellas to shelter 80 ...
Artificial light-dark cycles expose circadian clocks at odds with each other
...ing when it's dark," de la Iglesia said. "But your temperature
or hormone-release cycles might still be on Seattle time, affecting for instance how well you sleep." A bit of brain tissue called the suprachiasmatic nucleus, a daily pacemaker that regulates rhythms such as sleep and wakefulness, has thousands of ...
Protein keeps cold fish from becoming frozen flounder, new study shows
...rison with other fish antifreeze proteins. At room temperature
and at low pH values, however, it loses all activity perhaps explaining why it remained undetected for three decades. "Prior to this we had only found such hyperactive antifreeze proteins in insects," says Dr. Davies. Being able to control the gro...
New research at UNC shows ribosomes do not function as conventional enzymes
...ment is that their catalytic effects are extremely temperature
dependent. The question was whether the ribosome acts as an enzyme since there has been considerable interest in whether this particle does that." Ribosomes are critical sites of protein synthesis, he said. Inside those particles, amino acids are lai...
BioTime awarded NIH grant to aid Hetacool development
... during surgery. In the research project, the body temperature
of dogs will be lowered to reduce their metabolic ...e performed at low temperatures because lower body temperature
helps to minimize the chance of damage to the patient's organs by reducing the patient's metabolic d...
Moderate iron deficiency affects cognitive performance - but iron supplementation improves it
...d physical endurance, an impaired immune response, temperature
regulation difficulties, changes in energy metabolism, and in children, a decrease in cognitive performance as well as negative affects on behavior. While iron deficiency was once presumed to exert most of its deleterious effects only if it had reac...
New research explores 'early bird' and 'night owl' sleep patterns
...s in an environmental controlled chambers in which temperature
and humidity were held within a limited operating range. Slow wave sleep was determined from electroencephalograph electrodes attached to the skull and electromyograph electrodes in the neck muscles of the rat. The percent of slow wave sleep (perce...
UC Riverside researchers improve drought tolerance in plants
...on Agency Web site states that the Earth's surface temperature
has risen by about one degree Fahrenheit in the past century, with most of the warming occurring during the past two decades. The EPA suggests that most of the warming over the last 50 years can be attributed to human activities, but cautions that un...
ESA consults European science community on candidate Earth Explorer missions
...blish highly accurate measurements of humidity and temperature
in the troposphere and the stratosphere for climate trend observations. ACE+ comprises four satellites flying as two pairs in the same Sun-synchronous orbital plane but at two different altitudes. The satellites in the 650 km orbit will counter-rotat...
Phytoplankton may stimulate uptake of CO2
...nd CO2 levels during glacial periods that keep the temperature
low." The carbon cycle is a complicated system of causes and effects that are not completely understood, but researchers have long suspected that the oceans are the main regulator of the Earth's atmosphere, said Hales. For example, during the ice ag...
National Academies advisory: NAS Annual Meeting April 17-20
... sun have influenced our interpretations of global temperature
increases since the late 1970s. APRIL 19, 8 P.M. TO 9 P.M. -- AWARD CEREMONY. Recipients of NAS awards in 2004 will be honored, including MAURICE F. STRONG, who received the Academy's most prestigious award, the Public Welfare Medal. A receptio...
Newborn lambs' central heating system could aid fat busting in humans
The way newborn lambs regulate their temperature
in the first few weeks of life using a special dep...n internal central heating system maintaining body temperature
and preventing hypothermia, but rapidly disappears as brown fat is irreversibly replaced by normal w...
Keck Futures Initiative announces grant recipients
...temperature); resetting by environmental cues; and temperature
and nutritional compensation. Dunlap's project proposes to test an alternative model where autocatalysis plays a role equally as important as the existing negative feedback loop in generating a robust biochemical oscillator. This model incorporate...
Biologist's find alters the bacteria family tree
...'s biosphere must have changed and the atmospheric temperature
reached 72 degrees Celsius. This is the maximum temperature
at which photosynthesis can take place. Near the end of this era, about 2.7 to 2.9 billion years ag...
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