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POPSHuman migrations through the ages Researchers collected mitochondrial DNA, or mtDNA, from nearly 80,000 people, who received a report on how their ancestors came to live where they live.
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POPSSpeed-Reading the Genome In their DNA microscope, however, the molecule will move past the probe instead of the probe moving past the molecule. First, the DNA is incubated with four different fluorescent labels. The labels make the strand too big to go through the hole, so they have to pop off for the strand to advance. As the DNA moves through the nanopore base by base, the microscope will detect the labels as they pop off. Meller says the sequence data will be processed by a computer as each base is read off.
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POPSThursday, January 11, 2007Record-Breaking Speed for Flexible SiliconA new method of making ultr Most flexible electronics, such as those used in e-paper and roll-up displays for mobile devices, rely on transistors made of either organic polymers, printed directly on a plastic substrate, or amorphous, or noncrystalline, silicon. However, transistors made of these materials can't perform at the gigahertz speeds needed for complex circuitry or antennas. "People have for some time been able to make slow flexible electronics," but the speed of the transistors has been limited, says Max Lagally, professor of materials science and physics at the University of Wisconsin and collaborator of Ma.
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POPSChimps Are More Evolved than Humans "It's human egotism to put us on a pedestal," says molecular anthropologist Morris Goodman of Wayne State University School of Medicine in Detroit. "I was attracted to the paper because it seemed to be chipping away at this desire to make us all that extra-special. At the molecular level, humans are not necessarily exceptional in terms of the adaptive changes."
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POPSDeciphering the Cell's Other Code Histone proteins control DNA by forming spools around which DNA winds. Modifications to the histone tails can force the DNA to wind tighter, making it inaccessible, or loosen it, making that piece of DNA available for translation. Since each histone tail can carry multiple modifications, some scientists have suggested that different combinations of modifications might constitute a "code" that directs how DNA is accessed by the cell.
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POPSEasy-to-Make Nanosensors The researchers begin with commercially available films of silicon on top of an insulating material; then they use conventional techniques to lay down patterns of lines called masks that will determine the location of the nanowires. Though the masks are not thin enough to produce nanowires, the researchers allow the etching to continue eating away at the material under the edges of the mask, finishing the task. Since the body's immune system produces minute amounts of antibodies in response to diseases such as cancer, the devices could be used for early diagnoses.
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POPSPrescription RNA "The Holy Grail is to develop all this into drugs," says Zamore. "To be able to give you a small interfering RNA that would shut off expression of your high-cholesterol gene. That would lower the level of hepatitis C infecting your liver.
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POPSDeciphering the Cell's Other Code Histone proteins control DNA by forming spools around which DNA winds. Modifications to the histone tails can force the DNA to wind tighter, making it inaccessible, or loosen it, making that piece of DNA available for translation. Since each histone tail can carry multiple modifications, some scientists have suggested that different combinations of modifications might constitute a "code" that directs how DNA is accessed by the cell.
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POPSTransplanting a Genome This minimal genome could then be modified to carry fuel-producing genes, and the entire string of DNA could be transplanted into a bacterial carrier. But some scientists question whether a minimal genome is necessary to engineer useful bacteria.
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POPSFTDNA Surname Projects & More Men only. Father's father's father's ... father Have 12, 25, 37 or 67 markers tested on your Y chromosome, as well as learn about your ancient origins. Both men and women.Mother's mother's mother's ... mother. Have 1 or 2 regions of your mtDNA tested, or have your entire mtDNA tested, as well as learn about your ancient origins.
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