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Tag: "random" at biology news

Physicist cracks women's random but always lucky choice of X chromosome

...st" choice to be made between things rather than a random one. Now researchers led by University of Warwi...ber of women who unusually don’t have a completely random distribution of X chromosomes but the explanation may have much wider implications as at least 10% o...

Magnetic computer sensors may help study biomolecules

...el medical and forensic studies—a sort of magnetic random access memory (MRAM) for biosciences. Spin valves are made by stacking thin layers of materials with different magnetic properties. Their net magnetization can be switched on and off by applying an external magnetic field of sufficient strength to...

Do fruit flies have free will?

...ternal stimuli, they attribute this variability to random errors in a complex brain." Using a combination of...time that such variability cannot be due to simple random events but is generated spontaneously and non-randomly by the brain. These results caught computer s...

Genome of yellow fever/dengue fever mosquito sequenced

...Tu said. "By introducing TEs in a more or less random way to see what happens to the laboratory mosquitoes, the TEs become a tool to study the genetic mechanism of mosquito-virus interaction, to help us understand mosquito biology and reveal new ways to interfere with disease transmission," Tu said. ...

Left-right wiring determined by neural communication in the embryonic worm

...nation of which nerves develop on which side seems random from worm to worm. But now, Rockefeller University and Howard Hughes Medical Institute scientists working to demystify the worm's asymmetry have discovered that the arbitrary left-right configurations of two types of olfactory neurons are establishe...

Individuals and populations differ in gene activity levels, not just genes

...jority of the gene-expression variation was due to random differences between individuals, and was not tied to ancestral population or biological "race." "It's important to remember that differences between population groups are much less abundant than those you would see if you just compared two random...

MIT's ocean model captures diversity of underwater forests

...the oceans, but adds to the virtual soup about 100 random types of phytoplankton. The model randomly generates the single-celled plants, which differ primarily in their size, and in their sensitivity to light, temperature and nutrient availability, then allows the ocean to self-select those most fit for sur...

Scientists learn the origin of rogue B cells

...surface of B cells. The problem occurs when the random cutting and splicing of immunoglobulin genes results in an antibody that recognizes a component of one's own body. While the body has a built-in mechanism to correct these errant cells, the NIAMS researchers discovered this doesn't always work the wa...

Trusting your instincts leads you to the right answer

...movements are often involuntary. What seems like a random darting of the eye is often an essential subconscious scanning technique that allows us to pick out unique and distinctive features in a crowd ?such as colour or orientation. Soon after our eyes have fixed on a target, the conscious or top-down part ...

Darwin's famous finches and Venter's marine microbes

...dded the collected genetic material in millions of random snippets and then determined their sequence. Based on overlapping sequences, computer programs can then assemble longer stretches and merge them into longer pieces of a genome. These so-called "scaffolds" are a treasure trove for a diverse group of s...

FSU researchers determine a critical factor in workings of proteins

... be if the proteins find each other purely through random motion, and how much electrical attraction increases the rate. "This theory opens numerous opportunities for further study," Zhou said. "For example, we now can begin to uncover the molecular bases of large variations in association rate among pro...

No sex for 40 million years? No problem

... might arise solely through the chance build-up of random mutations that occur in the 'cloning' process when...he new study proves that these differences are not random and are the result of so-called 'divergent selection', a process well known to cause the origin of s...

New bird, bat species revealed by extensive DNA barcode studies

...ntaneous mutation rates in yeast, and in our first random sample we discovered that one-third of them control the mutation rate, and we had expected that only about 4 per cent might affect the rate. This shows that no matter how long you carry out research, there’s always something surprising around the cor...

Cancer that colonizes our bodies

...ntaneous mutation rates in yeast, and in our first random sample we discovered that one-third of them control the mutation rate, and we had expected that only about 4 per cent might affect the rate. This shows that no matter how long you carry out research, there’s always something surprising around the cor...

Making mice with enhanced color vision

...ed on three receptors. At some point in the past, random mutations created a variant of one receptor gene, located on the X chromosome, producing two different receptor types. Present-day New World (South American) monkeys still use this system, which means that in these monkeys only certain females can a...

Cells use 'noise' to make cell-fate decisions

...ic of all electrical circuits, typically caused by random fluctuations in the electric current passing throu...Conventional scientific thinking has been that the random nature of such fluctuations within cells interferes with the reliable operation of biological system...

Thinking with the spinal cord?

...rks functioned mechanically and completely without random impulses. The new discovery enables researchers to use the theory on cortical networks to explore how spinal cords generate movements. Still puzzled by movement How humans are able to move at all remains a puzzle. Our muscles are controlled by...

Killing the messenger RNA -- But which one?

... Then they chose one potentially affected gene at random to explore the ramifications of microRNA editing in depth. As it turned out, the gene they selected, known as PRPS1, codes for an essential enzyme involved in synthesizing uric acid. If levels of the enzyme are poorly regulated, a number of health pr...

New science of metagenomics 'will transform modern microbiology'

...extracted genetic material consists of millions of random fragments of DNA that can be cloned into a form capable of being maintained in laboratory bacteria. These bacteria are used to create a "library" that includes the genomes of all the microbes found in a habitat, the natural environment of the organi...

MIT's ocean model precisely mimics microbes' life cycles

...the oceans, but adds to the virtual soup about 100 random types of phytoplankton. The model randomly generates the single-celled plants, which differ primarily in their size, and in their sensitivity to light, temperature and nutrient availability, then allows the ocean to self-select those most fit for sur...

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