Tag: "differences" at biology news

Alzheimer's disease is not accelerated aging

...d dementia of the Alzheimer type, they found clear differences between the effects of normal aging and Alzheimer's disease. According to Head, the corpus callosum was smaller in older adults, regardless of whether they had dementia. In contrast, volume reductions in the hippocampus were markedly accelerated and ...

Genetic differences might help distinguish thyroid cancers

...ficult to distinguish can be readily identified by differences in only a few genes, new research shows. The study... "Our work begins to elucidate the fundamental differences and similarities between these two types of thyroid cancer, which should help in the future to devel...

Veterans with Gulf War syndrome have damage in specific, primitive portion of nervous system

... tested. In these tests, there were no appreciable differences between the two groups of veterans. Dr. Haley first described Gulf War syndrome in a series of papers published in January 1997 in the Journal of the American Medical Association (JAMA). In previous studies, Dr. Haley and his colleagues pr...

Researchers devise potent new tools to curb ivory poaching

...ence map to assign tusk origin. They noted genetic differences in populations from one location to another, and used a statistical method to extrapolate genetic signatures to fill in gaps between sampled populations. Matthew Stephens, a UW associate professor of statistics, developed a model allowing the resear...

Certain genes boost fish oils' protection against breast cancer

...ieties-called polymorphisms-in the population. The differences between the genes can mean the difference between GST that clears substances efficiently out of the body and GST that works a little slower. The researchers looked at the genetic makeup of study participants and grouped them according to which polymo...

Genes expose secrets of sex on the side

... are compared, patrilocality would predict greater differences between populations in Y-chromosome DNA than in mitochondrial DNA, which is just what earlier population genetic research found. Patrilocality also predicts that, on average, men do not migrate as far as women. On the basis of the genetic...

Gene expression in liver tumors and patient prognosis

...er subclasses of HCC and the underlying biological differences between the subclasses. The study yielded two distinct subclasses of HCC that were highly associated with patient survival and provided new molecular insight into the pathogenesis of HCC. Tumors from the low survival subclass had a strong c...

There and back again

...r connections with other cells. These tissue-level differences are reflected at the level of the individual cell as well. Under the microscope, mesenchymal cells are amorphous and lack the distinct apical-basal polarity that characterizes their epithelial counterparts. Both types of cells contribute to the body'...

New treatment for fibromyalgia

...tatistically significant. "The reasons for the sex differences in response are unclear," Dr. Arnold observes. "Be...o all men with fibromyalgia. There may also be sex differences in fibromyalgia that affect treatment response." As Dr. Arnold notes, further research is needed on ...

New research suggests early diet may play key role in protecting against childhood leukaemia

...er) will consider evidence that this may be due to differences in diet pattern. The incidence of childhood leukaemia in Britain increased dramatically during the twentieth century. The increase has mainly affected the under-five age group, in whom the risk increased by more than 50 per cent during the second ha...

Cell's gatekeeper for ammonia revealed in unprecedented detail

...lly the same for the human Rh factors, where small differences in the amino acid sequences of the conducting machinery lead to slight differences in their channels and provide for regulation and localization of the ammonia transport, Stroud said....

Newborns have ear preferences, too

...ata show that infants do have stimulus-related ear differences from birth. "We don't think that these differences are anatomical," said Barbara Cone-Wesson, an associate professor in the University of Arizona's spe...

Adaptive changes in the genome may provide insight into the genetics of complex disease

...00 base pairs or so. The most common form of these differences is"single nucleotide polymorphisms," or SNPs (pronounced 'snips'). Occasionally, new SNPs arise that allow certain individuals in a populationto be healthier and produce more offspring, and these variants become morefrequent through the process of na...

Imitative parrots just might tell you it's all in the tongue

...n theposition of a parrot's tongue can lead to big differences in sound. "Birdsong is an excellent model for huma...akeet. Human voices also have formants. Because of differences in genetics,development and behavior, these fingerprint-like formants vary greatlyfrom individual to...

In a world of distortion, archer fish learn to judge absolute size of aerial prey

...ce between the eye and the viewed object: dramatic differences in the size of the actual retinal image occur as the distance between viewer and object changes. A situation in which this corrective requirement is especially challenging arises for animals that need to judge the size of aerial prey from an underwat...

Genuine stem cells found in skin might treat hair loss, wounds

...populations within the bulge exhibited significant differences in the activity of some genes. However, the team a... the researchers added. Once the essential genetic differences that distinguish embryonic and adult stem cells come to light, they said, the more accessible stem c...

The birth of a beak

... they had developed into distinct species based on differences in their beaks-differences which corresponded with...m cells, each 'designer beak' must be made through differences in the regulation of cell behaviors," Chuong notes. Beaks are actually a collection of "facial promi...

Rare deficit maps thinking circuitry

...only molecular and cellular processes, but lead to differences in the brain circuitry for complex aspects of cognition." To identify where in the brain things go awry in the visuospatial construction deficit, Meyer-Lindenberg and Berman recruited 13 "high functioning" Williams Syndrome patients with normal intel...

JCI table of contents: 1 September, 2004

...l lung from hyperoxic damage. TITLE: Maturational differences in lung NF-kB activation and their role in tolerance to hyperoxia AUTHOR CONTACT: Phyllis A. Dennery University of Pennsylvania School of Medicine, Children's Hospital of Philadelphia, 34th and Civic Center Boulevard, Philadelphia, PA 19104, US...

Humans march to a faster genetic 'drummer' than primates, UC Riverside research says

... do not," Dugaiczyk said. Determining the genetic differences between humans and primates is important for several reasons, Dugaiczyk said, including advancing knowledge about how life developed and evolved on earth. Other benefits include making it easier to identifying human predisposition to genetic disease,...

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