Tag: "theory" at biology news
Human Breast Milk Contains Obesity Hormone
...t some infants are at a disadvantage." Another theory
about how leptin could be important is that leptin may play a role in passing obesity from one generation to the next. An obese mother who produces high levels of leptin and passes the hormone on to her infant may influence the child's metabolism int...
Similarities Found In Human, Chimp Brains; Columbia, Mount Sinai, NIH Scientists Find Region That Controls Language Identical In Both Species
...e same size in humans and chimpanzees,disproving a theory
that the brain section was enlarged only in humans...rch finding contradicts a long-standing scientific theory
thatonly humans displayed the left-side brain enlargement. Nineteenth-centuryneurologist Carl Werni...
Infants, Toddlers Should Not Restrict Fat Intake, Experts Say
...r fat in early development, Hennig says there is a theory
that offers another reason infants should have com...s milk is very high in fat. There is a provocative theory
that high fat content in breast milk may suppress the enzyme that causes the body to synthesize chol...
Transposable Elements May Have Had A Major Role In The Evolution Of Higher
...pers on transposons for more than10 years. His new theory
was published in the March issue of the journal Tr... lines of evidence McDonald uses in developing his theory
focus onthe two gene-silencing mechanisms that organisms have developed. One of thesemechanisms invo...
New Research Suggests REM Is About Eyes Not Dreams
...reyelids. From these findings evolved the popular theory
that during this REMsleep the brain is processing ... different purpose for REM sleep. Hedeveloped his theory
when he learned of a young man whose eyes had beenimmobilized by an accident and whose corneas had b...
Carnegie Mellon Researchers Say Direct Instruction, Rather Than "Discovery Learning" Is Best Way To Teach Process Skills In Science
...ew curriculum units that are grounded in cognitive theory
and will beintegrated into the classroom context," Klahr says. For a related story:http://www.washingtonpost.com/wp-srv/frompost/jan98/science26.htm...
Race And Human Evolution
...k, Wolpoff andCaspari describe the "Out of Africa" theory
of human origins, which holds thatall living peopl...il record and genetic datasupport a multi-regional theory
of human evolution. According to this theory,human populations evolved concurrently in various regi...
Leftover Fetal Cells May Affect Development Of Scleroderma
...ears, colleagues at Fred Hutchinson helped the new theory
gel in her mind. They frequently perform bone marrow transplants, and much discussion revolvesaround GVHD, which, by definition, she says, is chimerism. Moreover, clinicallyGVHD looks like scleroderma. Then two years ago, Dr. Bianchireported that f...
Study Links Viruses And Vascular Diseases
...d-up of plaque. Though it has its supporters, this theory
has always suffered a credibilityproblem -- there has never been any direct evidence that viruses can injure humanvessels. Now, thanks to a surprising discovery at Washington University Schoolof Medicine in St. Louis, there is a new reason to reconsi...
Biotech Firms Develop Where Star Scientists Worked, Study Shows
...hile the results may not seem surprising, economic theory
suggests thatinnovations -- like those in biotechnology -- can be freely used by anyonewith access to the right financing and knowledge. However, Brewer said,this study shows that the scientists involved in biotechnology researchwere crucial in ensur...
Butterfly Wings, Beetle Horns Teach Biologists Basic Lesson In Development's Laws
..., while he and Emlen began their experimentswith a theory
that competition for nutrients might be the basis for any observedchanges in the insects, they still don't know what chemical communication takesplace between the fore and hind butterfly wings, or between the beetle's hornsand eyes. Either a hind win...
How Did Life Begin? Biochemical Evolution On Chemical Surfaces
...ces paper published Tuesday, March 31, provides a theory
for how small organic molecules may have been able to assemble on the surfaces of minerals into self-replicating biomolecules--the essential building blocks of life. "The problem with most theories on the origin of life is that there is too m...
Hard Hearts: New Discovery Of Bone In Heart Tissue May Explain Valve Disease
...estion: How did bone cells get into theheart? "One theory
is that, under the right conditions, either valve cells orinflammatory cells at the area of heart damage undergo a genetic change andstart making bone-cell proteins," suggests Mohler. "But, the most importantquestion is: What's the trigger?" ...
Extra Choline During Pregnancy Enhances Memory In Offspring
... havethe same memory-enhancing effect in humans, a theory
for which considerableevidence already exists, the researchers said. Choline is a naturally occurring amino acid found in egg yolks, milk,nuts, liver and other meats as well as in human breast milk. It is the essentialbuilding block for a me...
Pitfalls Of Puberty: New Animal Research Shows Stress During Adolescence Alters Behavior And Brain Chemistry
... The researchers plan to test their theory
further by examiningvasopressin and serotonin activity in hypothalamus samples taken from thestressed hamsters while they were interacting with other hamsters. They alsohope to determine if other chemicals are involved in the behavior changes andwhe...
Learning About Evolution Critical For Understanding Science
...hool students receive little or no exposure to the theory
of evolution, the most important concept in unders...ols to help integrate lessons about the scientific theory
with basic biology for children in kindergarten through grade 12. The guidebook was written by a gr...
New Species Of Winged Dinasaur Named For Yale Professor
...one of the earliest proponents of thecontroversial theory
that modern-day birds are descended from dinosaurs...osaurs. Ostrom, author of the much-debated theory
that some dinosaurs werewarm-blooded, is professor emeritus of geology and geophysics, editor of the...
Infant Dependency Drives Menopause, NSF-Supported Researcher Reports
...t menopause to occur earlier in life." The theory
predicts that reproductive decline will begin once themother's life expectancy drops below the time required to raise additionaloffspring. For example, if women in pre-technological societies could expect tolive 50 years, and if a child, in order to...
Biochemist Solves Riddle Of Collagen Stability
...sin-Madison research team has overturned a central theory
about the stability of collagen, a protein that acts like a "solder" to give the body its structure and shape. A new explanation of the phenomenon, published April 16 in the journal Nature, could expand the potential of collagen in treating serious d...
Earlier Human Speech?
...o, the Dukescientists' evidence disagrees with the theory
that human speech may not havearisen until about 40,000 years ago, based on the unambiguous appearance ofsymbols in the archaeological record. Some researchers infer the presence oflanguage abilities from such symbols as body ornamentation and delib...
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