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thinkahol *

Erasing signs of aging in human cells now a reality - 1 views

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    ScienceDaily (Nov. 3, 2011) - Scientists have recently succeeded in rejuvenating cells from elderly donors (aged over 100). These old cells were reprogrammed in vitro to induced pluripotent stem cells (iPSC) and to rejuvenated and human embryonic stem cells (hESC): cells of all types can again be differentiated after this genuine "rejuvenation" therapy. The results represent significant progress for research into iPSC cells and a further step forwards for regenerative medicine.
thinkahol *

First successful transplantation of a synthetic windpipe | KurzweilAI - 0 views

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    A 36-year-old man has received the world's first synthetic trachea, made from a synthetic scaffold seeded with his own stem cells, in an operation at the Karolinska University Hospital in Stockholm, Sweden. Professor Paolo Macchiarini of Karolinska University Hospital and Karolinska Institutet led an international team, including professor Alexander Seifalian from University College London, who designed and built the nanocomposite tracheal scaffold, and Harvard Bioscience, which produced a specifically designed bioreactor used to seed the scaffold with the patient´s own stem cells. The cells were grown on the scaffold inside the bioreactor for two days before transplantation to the patient. Because the cells used to regenerate the trachea were the patient's own, there has been no rejection of the transplant and the patient is not taking immunosuppressive drugs. "The big conceptual breakthrough is that we can move from transplanting organs to manufacturing them for patients," says David Green, the president of Harvard Bioscience in Holliston, Massachusetts. Transplantations of tissue-engineered windpipes with synthetic scaffolds in combination with the patient's own stem cells as a standard procedure means that patients will not have to wait for a suitable donor organ. Patients could benefit from earlier surgery and have a greater chance of cure. This would be of especially great value for children, since the availability of donor tracheas is much lower than for adult patients.
Infogreen Global

Hybrid solar cells to boost the electrical current - 0 views

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    Typically, a solar cell generates a single electron for each photon captured. However, by adding pentacene, an organic semiconductor, the solar cells can generate two electrons for every photon from the blue light spectrum. This could enable the cells to capture 44% of the incoming solar energy.
thinkahol *

Stressed-DNA repair protein identified | KurzweilAI - 0 views

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    Vera Gorbunova and Andrei Seluanov of the University of Rochester have found that human cells undergoing oxidative stress caused by environmental chemicals or routine cellular processes produce a protein (SIRT6) that stimulates cells to repair DNA double-strand breaks, thought to be associated with premature aging and cancer. The team first measured levels of SIRT6 in stressed cells, then treated a second group of stressed cells with a drug that deactivates the protein. DNA repair in the second group stopped, confirming SIRT6′s role.  The team also found that SIRT6 acts in concert with another protein, called PARP1, to make the repairs. Furthermore, the team found that increased levels of SIRT6 lead to faster DNA repair. They suspect that the protein acts as a "master regulator," coordinating stress and DNA repair activities. Ref.: Zhiyong Mao, Christopher Hine, Xiao Tian, Michael Van Meter, Matthew Au, Amita Vaidya, Andrei Seluanov, and Vera Gorbunova. SIRT6 Promotes DNA Repair Under Stress by Activating PARP1. Science 17 June 2011: 1443-1446. [DOI:10.1126/science.1202723]
Infogreen Global

Bugs from space to increase the electrical output of the fuel cells Bugs from space to ... - 0 views

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    Microbial Fuel Cells, which work in a similar way to a battery, use bacteria to convert organic compounds directly into electricity by a process known as bio-catalytic oxidation.
thinkahol *

Berkeley Lab scientists open electrical link to living cells | KurzweilAI - 0 views

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    Scientists with the Lawrence Berkeley National Laboratory (Berkeley Lab) have designed an electrical link to living cells engineered to shuttle electrons across a cell's membrane to an external acceptor along a well-defined path. This direct channel could yield cells that can read and respond to electronic signals, electronics capable of self-replication and repair, or efficiently transfer sunlight into electricity.
thinkahol *

Scientists report first solar cell producing more electrons in photocurrent than solar ... - 0 views

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    (PhysOrg.com) -- Researchers from the National Renewable Energy Laboratory (NREL) have reported the first solar cell that produces a photocurrent that has an external quantum efficiency greater than 100 percent when photoexcited with photons from the high energy region of the solar spectrum
thinkahol *

Invention regulates nerve cells electronically - 0 views

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    ScienceDaily (May 22, 2010) - A major step toward being able to regulate nerve cells externally with the help of electronics has been taken by researchers at Linköping University and the Karolinska Institute in Sweden. The breakthrough is based on an ion transistor of plastic that can transport ions and charged biomolecules and thereby address and regulate cells.
thinkahol *

Japan team says stem cells made paralysed monkey jump again - 0 views

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    Japanese researchers said Wednesday they had used stem cells to restore partial mobility in a small monkey that had been paralysed from the neck down by a spinal injury.
Infogreen Global

Miniature Fuel Cells To Power Mobile Phones - 0 views

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    The catalysts would enable the production of hydrogen from liquid fuel stored in a disposable or recycled cartridge, creating miniature fuel cells to power everything from mobile phones to laptops.
Infogreen Global

Solar cells could reach 70 percent efficiency - 0 views

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    Printing specially engineered nanostructures on solar cells allows them to reach as high as 70 percent efficiency.
Infogreen Global

Extracting energy from the waste water and salt water - 0 views

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    The technologies Logan refers to are microbial fuel cells (MFC)- which use wastewater and naturally occurring bacteria to produce electricity - and reverse electrodialysis (RED) - which produces electricity directly from the salinity gradient between salty and fresh water. The combined technology creates a microbial reverse-electrodialysis cell (MRC).
thinkahol *

Researchers create self-assembling nanodevices that move and change shape on demand | K... - 0 views

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    Harvard researchers have created nanodevices made of DNA that self-assemble and can be programmed to move and change shape on demand. The nanodevice structure is based on the principle of tensegrity: its strength and stability results from the way it distributes and balances the counteracting forces of tension and compression. This new technology could lead to nanoscale medical devices and drug delivery systems, such as virus mimics that introduce drugs directly into diseased cells. Or it could one day be used to reprogram human stem cells to regenerate different kinds of injured organs and tissue.
thinkahol *

The future of metabolic engineering: Designer molecules, cells and microorganisms - 0 views

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    ScienceDaily (Dec. 3, 2010) - Will we one day design and create molecules, cells and microorganisms that produce specific chemical products from simple, readily-available, inexpensive starting materials? Will the synthetic organic chemistry now used to produce pharmaceutical drugs, plastics and a host of other products eventually be surpassed by metabolic engineering as the mainstay of our chemical industries? Yes, according to Jay Keasling, chemical engineer and one of the world's foremost practitioners of metabolic engineering.
thinkahol *

YouTube - Organ Printing - 0 views

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    The "ink" in the bioprinting process employed by Organovo is composed of spheres packed with tens of thousands of human cells. These spheres are assembled or "printed" on sheets of organic biopaper. By precisely placing the cells with the bioprinter, and providing them with the proper natural developmental cues, they do exactly what they do in nature: they self assemble into fully formed, functional tissue.
thinkahol *

25% of US car accidents due to using gadgets | KurzweilAI - 0 views

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    Driving distractions such as cell phones and other electronic devices cause as much as 25% of all U.S. car accidents, researchers at the Governors Highway Safety Association have found, WinBETA notes. A major finding was that being distracted was the cause of 15 to 25% of all accidents, ranging from minor property damage to death. Their findings suggest that distracted driving accidents be reported in accident reports to assist in evaluating distracted driving laws and programs. They propose creating low-cost roadway measures that alert motorists when they are drifting out of their driving lane. They also propose that all cell phones be banned on the road, even hands-free versions. In another report by The New York Times, police in Syracuse and Hartford have handed out nearly 20,000 tickets for illegal use of a phone while driving - either for texting or use of a handheld phone. According to the federal government, these efforts have had the desired effect: distracted driving has fallen sharply. Their research shows that drivers talking on a phone are four times as likely to get into a crash as those not on a phone, and that the risks for motorists who text are at least twice as high. In Syracuse, handheld cellphone use and texting have each fallen by one-third. In Hartford, handheld cellphone use by drivers fell 57 percent while texting fell by 75 percent, the Times reports. Ref.: Vicki Harper. et al., Distracted Driving: What Research Shows and What States Can Do, GHSA, 2011
techinstro com

Description and Specification of Graphene - 0 views

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    Graphene is a single-atom-thick sheet made from combined carbon atoms. The carbon atoms are bonded together to share electron in a hexagonal, honeycomb-like structure. It is a single atom thick layered 2D material ever discovered in the world. It is made up of a hexagonal lattice pattern of carbon atoms in a monolithic honeycomb-like structure. It is a layer of SP2 single bonded carbon atoms arranged like a chicken wire mesh. It is 200 times stronger than stainless steel (SS) and 100 thousand times thinner than the human hair. It is the slimmest and strongest compound available on the earth. Anybody would be amazed when they know that we have found a material which is harder than diamond, yet lightweight, stronger than steel, but also highly flexible, and this material can be mined from the earth as it occurs naturally. It is yet thin enough to be mistaken for a saran wrap. Apart from the optimum physical properties, the other features are also impressive. Properties of Graphene These are some prominent features which make it a hi-tech material: Excellent Electronic Conductor Chief electronic property makes it an efficient Zero-Overlap Semi metal and gives it sufficient electrical conductivity. Carbon atoms possess typically 2 electrons in the inner shell, and 4 electrons in the outer orbit, total 6 electrons. Although conventionally, the outer 4 electrons in carbon can connect with another atom, each, the atoms can form a 2-dimensional bond with three atoms per single atom. This leaves an electron available for electronic conduction. Such electrons are known as 'Pi' electrons and found above and below in sheet. Ultimate Tensile Strength Mechanical strength is another prominent property of the material. It considered as being the foremost most robust material ever discovered, owing to the 0.142 Nm-long carbon bonds. It also possesses ultimate tensile strength, measuring 130 Gigapascals (or 130,000,000,000 Pascals). Compared to the tensile strength of industr
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