Bark Beetle Infestation Spurs Multifaceted Study
... often used to determine the ageof trees and their dates of cutting. Climate information, the history ofdro...fy the age of archaeological sitesfrom the cutting dates of construction materials. Taylor is using tree rings to date the episodes of fire in the forest. ...Researchers To Investigate Years Before Menopause
...inual calendars indicating the starting and ending dates of their monthly periods. Annual health surveys are done each year and include information on births, abortions, miscarriages, surgery, marriage, divorce and stressful events as well as general health and birth control information. In...Researchers Investigate Years Before Menopause
...tinual calendars indicating the starting andending dates of their monthly periods. Annual health surveys are done each yearand include information on births, abortions, miscarriages, surgery, marriage,divorce and stressful events as well as general health and birth controlinformation. In 1984, the trust mo...New Dating Technique May Revise Geologic Time Scale
...rect ages, which wereknown before by comparison to dates from igneous minerals. Until now, scientis...at provedto be crucial in discovering why glaucony dates come out too young," says NormanEvensen of the U of T's department of physics. "We hope other scient...New Sickle-Clawed Fossil From Madagascar Links Birds And Dinosaurs
... The fossil bird is 65 to 70 million years old and dates from the LateCretaceous period. It was discovered in 1995 by an international team ofpaleontologists led by researcher David Krause, also of SUNY-Stony Brook. Thescientists have named the new discovery Rahona ostromi, meaning "Ostrom's menacefrom t...New Sunspot Cycle To Be Bigger Than Average
...of its 23rd activity cycle, anumbering scheme that dates from the mid-19th century, followingintroduction of the "relative sunspot number" by RudolfWolf of the Zurich Observatory in 1848. Wolf's sunspot number(now called the International sunspot number or the Zurich number)represents a blend of actual num...Gene Study Shows Mammals Lived Before Extinction Of The Dinosaurs
...rs found that their molecular clock yielded origin dates similar tothose based on fossil dating for many species, but for others the genetic clueslead back to a much earlier time. For example, Hedges says "the fossil recordfor rodents says that mouse and rat split only 10 million years ago, but we have343...Neurogenetics Lab Scan Suggests Genetic Linkage On Chromosomes 4 And 11
...e of biology, culture, language, and location that dates from pre-Columbian times. Because of high alcoholism prevalence, the researchers selected the study population without clinical assessment, on the basis of multigenerational genealogies, current family structure, geographic availability, and willingn...The Shape Of Life: How Does The Computer "Know" When It Sees It?
...may seem obvious, but itsscientific grounding only dates back toProfessor D'Arcy Thompson of the University of St. Andrews in Scotland and his1917 book On Growth and Form. "He's the original morph man," said Noever,referring to Thompson and the ......has followed 622 HIV-infected menwith well-defined dates of HIV seroconversion. At 10 years afterseroconversion, 11 percent were identified as LTNP: they had lived with HIV formore than a decade without progressing to full-blown AIDS and their CD4 cellcounts remained above 500. Of this group, only an esti...Priestly Gene Shared By Widely Dispersed Jews
...25 or 30 years. Since biblical tradition dates the establishment of the Jewishpriesthood to roughly 3,000 years ago, it may be possible to utilize analysis ofthe Y-chromosome DNA of modern-day Jewish priests to deduce rates and mechanismsof DNA mutation and Y chromosome evolution. Further...Jurassic Beetle: CSIRO Entomologist Discovers Living Fossil
...an ommatid, a member of a family of beetles which dates back to the Jurassic," he recounts. The beetle, a fresh candidate for the honour of oldest living Australian, is even more ancient than the super-continent Gondwana. Its cousins are found in South America, North America, Europe and Asia, sugg...Monkeys Have Numerical Abilities, Two Columbia Psychologists Report
...The research challenges the prevailing view, which dates to Descartes,that non-human primates cannot think because they cannot use language. It alsochallenges the views of B.F. Skinner, the noted behaviorist and Prof. Terrace'smentor at Harvard, who held that all examples of animal intelligence were simpl......ue of National Geographic. The nesting site, which dates from the late Cretaceous and is approximately 70to 90 million years old, is located near Auca Mahuida, in the Patagonianbadlands of Argentina. The research team, headed by scientists from theAmerican Museum of Natural History in New York City and th...Fall Meeting: Updated Press Conference Schedule
...lowing list is offered with the understanding that dates and times, even topics, may change. We do not anticipate significant changes to this schedule between now and Fall Meeting; any that occur will be posted on the message board in the Press Room. Press Room and Briefing Room Location: The address of ...Oldest Ice Core From The Tropics Recovered, New Ice Age Evidence
... The ice at the bottom of both cores dates back25,000 years into the coldest period of the last ice age-- the last glacial maximum (LGM). The abrupt beginning and end of a Younger-Dryas-type event suggest that...Low Birth-Weight Risk Begins Early
...ed women who were uncertain about their conception dates or who had notreceived their first prenatal care until the second or third trimester. Theanalysis was then focused on the remaining 4,229 pregnancies. Electronic calipers were used with each ultrasound image to measure thecrown-rump length (the en...Bones of Crocodile-like Beasts Tell Tale of Global Warming
...w a layer of marine rock common inthe Arctic. That dates the fossils to the period immediately after the volcanismended. "I had been looking for rocks from this layer for many years - in mostplaces the layer doesn't exist or has worn away," says Tarduno, a geophysicistwho studies Earth's magnetic f...Large Gene Study Questions Cambrian Explosion
...e researchers because they yielded a wide range of dates forthe origin of animal species, although all the ...ages of life evolved on Earth, we can comparethose dates to events in the chemical evolution of Earth's atmosphere and ocean,such as when oxygen and other im...UD Valentine Science: Cell "Dating" Habits May Promise Healthier Hearts
...o prowl the corridors of the bloodstream,arranging dates for various cell pairs. CIB, on the other hand, is an inside operator, similar to known "regulatory"proteins, which works within platelets to attract the protein fibers that form aframework for blood clots. When a blood vessel is injured, biochemica...