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Tag: "patterns" at biology news

One fish, two fish: New MIT sensor improves fish counts

...he first time scientists have been able to see the patterns formed by large fish populations. Makris found tha... displaying a fractal pattern. Population density patterns could be a means of communication, Makris said. His team observed "waves" of population density that...

History of human cannibalism eats away at researchers

...sociations with diseases or to evaluate historical patterns of human migration. The prion protein gene ( PRNP... the ages of the mutations, to identify geographic patterns of variation, and to evaluate selective forces that have potentially influenced these patterns. "In...

Engineered heart tissue offers insights into irregular heartbeats, defibrillator failure

...o culture dishes on which they had stamped precise patterns of proteins known to support heart tissue growth. ...lerating their rhythm. Should such characteristic patterns hold in patients, physicians could potentially use them to identify those people for whom defibrilla...

The first baby boom

...h rate. Discussing the shifts in the demographic patterns before and after the introduction of agriculture in Europe at the end of the Stone Age, Jean-Pierre Bocquet-Appel (Ecole des Hautes Etudes en Sciences Sociales, France) writes, "The signal of a demographic change we detected ?is characterized by an a...

Common molecular 'signature' identified in solid tumors

...man cancer, had a hunch that there might be shared patterns of miRNA among certain cancers. Under his direction, researchers looked for miRNA activity, or expression, in 540 samples of lung, breast, stomach, prostate, colon and pancreatic tumors and in the normal tissue surrounding them. Using microarray te...

Albatross study shows regional differences in ocean contamination

..., at least in part, to the differences in foraging patterns between the two species," Finkelstein said. The high contaminant load in black-footed albatrosses foraging in the California Current probably reflects the long history of industrial and agricultural discharges along the West Coast, Finkelstein said....

Vegetables inhibit growth of prostate cancer in mice with human tumors

..., at least in part, to the differences in foraging patterns between the two species," Finkelstein said. The high contaminant load in black-footed albatrosses foraging in the California Current probably reflects the long history of industrial and agricultural discharges along the West Coast, Finkelstein said....

Habitat microstructure drives salamander metamorphosis

...bitat microstructure can have a major influence on patterns of development, morphology and evolution. Ronald Bonett and Paul Chippindale from the University of Texas at Arlington, Texas, USA, analysed the type, size and degree of sorting of streambed sediments for 22 populations, 11 paedomorphic and 11 metam...

UC San Diego biologists solve plant growth hormone enigma

...thinking in the field, the research shows that the patterns in which auxin is produced in the plant influence development, a finding that can be applied to improving crops. "The auxin field dates back to Charles Darwin, who first reported that plants produced a substance that made them bend toward light," s...

Scientists find Antarctic ozone hole to recover later than expected

...ic stratosphere, and assessments of future weather patterns over Antarctica. The model accurately reproduces the ozone hole area in the Antarctic stratosphere over the past 27 years. Using the model, the researchers predict that the ozone hole will recover in 2068, not in 2050 as currently believed. Interna...

In a technical tour de force, Salk scientists take a global view of the epigenome

...urposes will likely involve remodeling methylation patterns to resemble those of stem cells. And disease states, ranging from retardation to cancer, are marked by aberrant methylation: some carcinogens cause cancer by methylating the "wrong" genes, leading to uncontrolled growth. Once a cell's DNA methylat...

Researchers map out networks that determine cell fate

..., Singh said. Many leukemias exhibit mixed-lineage patterns of gene expression, for example of both macrophage and lymphocyte genes. "It may be that these cells are stuck in a progenitor-like state," said Singh. "If you could induce them to resolve that state ¡X to differentiate into one or the other cell...

UGA study explains peaks and troughs of dengue epidemics

... that cross-immunity alone is enough to create the patterns that are observed in nature. The study is a major departure from other theories about what drives dengue epidemics. The conventional wisdom is that an amplification of the severity of disease caused by repeat infections with different strains, a ph...

In-home sensors spot dementia signs in elderly

...rs placed in elders' homes can help track activity patterns thought to relate to memory changes that are early signs of dementia. The study results, presented last week at the 10th International Conference on Alzheimer's Disease and Related Disorders in Madrid, show that continuous, unobtrusive monitoring o...

New tool tracks brain development in babies

...he 10 infants continued to exhibit disturbed fiber patterns at follow-up. All of the infants who had disturbed patterns in the corona radiata at three months had major motor problems. "Minor white matter abnormalities s...

Purdue creates new low-cost system to detect bacteria

... descriptors can be used to analyze how light-wave patterns are distorted after passing through lenses having ... something similar. We reduced complicated scatter patterns to 120 numbers based on Zernike polynomials." This reduced collection of numbers describes how wel...

Marine 'dead zone' off Oregon is spreading

...tal new trend in atmospheric and ocean circulation patterns in the Pacific Northwest appears to have begun, sc...pheric Sciences. "This change from normal seasonal patterns and the increased variability are both consistent with climate change scenarios." Barth and his col...

Everything in its place: Researchers identify brain cells used to categorize images

... of familiar visual images and that brain activity patterns changed dramatically as a result of learning. Thei...ich they grouped members of a set of visual motion patterns into one of two categories. Freedman and senior author John Assad, PhD, HMS associate professor of n...

Mitochondrial DNA sequencing tool updated

...yed 500 of the most common haplotypes - or grouped patterns of known DNA variations - banked in the mitochondrial public database." Mitochondria are oblong, thread-like structures dispersed throughout the cell's cytoplasm. Hundreds to thousands of mitochondria exist in each human cell, occupying up to a ...

New HIV study identifies high-risk subgroups of adolescents

...e subgroups within a high-risk population in which patterns of risks like unprotected sex, mental health crise...lescents have the same risk behaviors and that the patterns seem to be different between boys and girls. It's also important because it suggests that programs d...

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