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Tag: "differ" at biology news

Retina adapts to seek the unexpected, ignore the commonplace

...ction in both amphibians and mammals, animals that differ greatly in ecology and physiology but share the challenge of adjusting to a variable visual environment. ...

Did humans cause ecosystem collapse in ancient Australia?

... of carbon found in nature--12C, 13C and 14C. They differ in the number of neutrons in the nucleus. By far the most abundant variety is in the lightest, 12C. About 1% is 13C, a heavier sibling with an additional neutron. There is even less 14C, the unstable, radioactive heavyweight of them all. "13C is the...

Grasshopper love songs give insight into sensory tuning

...timal stimulus ensembles" that trigger the neurons differ from those the grasshopper hears in the natural environment but largely overlap with components of natural sounds found in mating and mate-location calls. In their experiments, the researchers first played various snippets of white noise to isolated...

California computer scientists double volume of data in NIH biotech repository

...ch are sites in the DNA sequence where individuals differ at the level of nucleotides. These SNPs (pronounced snips) are locations in the human DNA sequence where two possible bases occur in the population. SNPs account for the most common type of variation in DNA sequence in humans and due to the recen...

U-M scientists say fused genes trigger the development of prostate cancer

...ch are sites in the DNA sequence where individuals differ at the level of nucleotides. These SNPs (pronounced snips) are locations in the human DNA sequence where two possible bases occur in the population. SNPs account for the most common type of variation in DNA sequence in humans and due to the recen...

Emerging staph strains found to be increasingly deadly and deceptive

...a. Scientists know that community-acquired strains differ from hospital strains, but they don't know why the community strains cause more serious infection in otherwise healthy people. The work also identified specific S. aureus genes that potentially control the bacterium's escape from neutrophils. Among ...

Cornell finds natural selection in humans

The most detailed analysis to date of how humans differ from one another at the DNA level shows strong evidence that natural selection has shaped the recent evolution of our species, according to researchers from Cornell University, Celera Genomics and Celera Diagnostics. In a study published in the Oct...

Wright bros. upstaged! Dinos invented biplanes

...ut also on foot," said Chatterjee. Flight feathers differ noticeably from other feathers in that they are asymmetrical with interlocking barbules to keep their shape. The leading edge of each long feather was narrower than the trailing edge, which helped streamline the body in flight. The hooked, interlocki...

Evolutionary conservation of a mechanism of longevity from worms to mammals

...ng process of different organisms will most likely differ due to different physiologies and environments, Dr. Hekimi summarizes the relevance of their findings by concluding that "�the longevity-promoting effect of reducing clk-1/mclk1 activity that was initially observed in C. elegans is conserved in mice,...

Gene Expression in the Aging Brain

...tion that age-related gene expression patterns can differ in different cells of a single organism. The authors found a similar difference in age-related patterns in the brain of the chimpanzee, with many genes down-regulated in the cortex that remained unchanged in the cerebellum. However, the set of affec...

Navigating the brain for sense of direction as paradigm for higher cognitive functions

...tion that age-related gene expression patterns can differ in different cells of a single organism. The authors found a similar difference in age-related patterns in the brain of the chimpanzee, with many genes down-regulated in the cortex that remained unchanged in the cerebellum. However, the set of affec...

Carnegie Mellon scientists create PNA molecule with potential to build nanodevices

...tion that age-related gene expression patterns can differ in different cells of a single organism. The authors found a similar difference in age-related patterns in the brain of the chimpanzee, with many genes down-regulated in the cortex that remained unchanged in the cerebellum. However, the set of affec...

Islands in the Genome Promote Speciation

...rner and colleagues found that the M and S genomes differ at just three regions. The researchers suggested that genes present here may be responsible for early speciation. These three “speciation islands?in the genome contain 67 predicted genes. In a preliminary analysis of seven of these genes, Turner and ...

Adult stem cells aid recovery in animal model of cerebral palsy

...rner and colleagues found that the M and S genomes differ at just three regions. The researchers suggested that genes present here may be responsible for early speciation. These three “speciation islands?in the genome contain 67 predicted genes. In a preliminary analysis of seven of these genes, Turner and ...

Plants, too, have ways to manage freeloaders

...terial species, which could mean that strains also differ in how easily they can enter the plant roots to initiate nodulation. This could explain why soybean and other legume crops in fields inoculated with the supposedly most efficient strain of nitrogen-fixing bacteria do not always take up that strain - ...

Scientists develop protein-sequence analysis tool

...ne their functions -- and learning how these sites differ between paralogs, proteins that have different fun...ies positions where two related groups of proteins differ either in amino acid identity or in a property such as charge or polarity. "Experience tells us tha...

New study explores beetle species with two forms of females

...es when the costs and benefits of multiple matings differ for males and females. "The male versus female arms race (involving physical structures, behaviors, chemicals, etc.) for control over mating may take place over evolutionary time, which in theory can lead to the formation of a new species," explai...

Liver cancer linked to cellular repair pathway

...ese primitive cells are similar to stem cells, but differ in basic ways involving cell reproduction. Hedgehog may lead to liver and other cancers because of over-activation of Hedgehog pathway's components or genetic mutations that accumulate in these components during tissue repair. "Ordinarily, the proce...

Researchers map of genetic variations implicated in disease

...ncluding malaria and AIDS. Genes in the MHC can differ dramatically between people, and the differences among us affect medical events as diverse as tissue transplant rejection, arthritis, asthma and disease resistance. A detailed study of this region in different people will shed light on which genes ar...

Mute swan population helps explain longstanding evolutionary question

...stion: Why does a population's average clutch size differ from the most productive clutch size?" said researcher Ann Charmantier. "Gradually the debate switched to an evolutionary point of view with a second, related question: Why is clutch size not evolving despite significant heritability and directional ...

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