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მსოფლიო სამეცნიერო სიახლეები

Quantum scientists demonstrate world-first 3D atomic-scale quantum chip architecture

energy-daily.com - სამ, 08/01/2019 - 17:28
Sydney, Australia (SPX) Jan 08, 2019
UNSW researchers at the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) have shown for the first time that they can build atomic precision qubits in a 3D device - another major step towards a universal quantum computer. The team of researchers, led by 2018 Australian of the Year and Director of CQC2T Professor Michelle Simmons, have demonstrated that they

Taiwan arrests BASF engineers for 'leaking tech' to China

energy-daily.com - სამ, 08/01/2019 - 17:28
Taipei (AFP) Jan 7, 2019
Six former and current engineers for German chemicals giant BASF have been arrested in Taiwan on suspicion of leaking valuable technology to a competitor in China, authorities said Monday. Taiwan's Criminal Investigation Bureau (CIB) released a statement saying the suspects were involved in a plot "to leak crucial technology and manufacturing processes... to make illegal profits". An off

Tech firms see good times as flexible displays roll, and fold

energy-daily.com - სამ, 08/01/2019 - 17:28
Las Vegas (AFP) Jan 8, 2019
Electronic displays that fold, roll and bend have finally arrived after years of development, and tech firms are touting the technology as a potential source of growth and new applications. At the Consumer Electronics Show on Monday, South Korean giant LG unveiled its ultra-high definition television that rolls into and out of a base stand and can be furled and unfurled on demand. "It br

Alstom to introduce hydrogen-powered trains in U.K.

energy-daily.com - სამ, 08/01/2019 - 17:28
Washington (UPI) Jan 7, 2019
France-based Alstom presented Monday a new hydrogen train design for the U.K. market with the aim to build a fleet that will be up and running by 2022, following up on its introduction in Germany in September. The new model, named Breeze, is based on a conversion of existing Class 321 trains, which are conventionally powered and used for commuter service in the U.K., said Alstom, adding

Sidestepping trade war, Musk breaks ground on Tesla Shanghai plant

energy-daily.com - სამ, 08/01/2019 - 17:28
Shanghai (AFP) Jan 7, 2019
Tesla boss Elon Musk presided Monday over the ground-breaking for a Shanghai factory that will allow the electric-car manufacturer to dodge the China-US tariff crossfire and sell directly to the world's biggest market for "green" vehicles. The plant in a Shanghai suburb is Musk's biggest overseas move yet and will eventually have an annual production capacity of 500,000 vehicles, Tesla says,

Hyundai unveils walking concept car Elevate

dezeen - სამ, 08/01/2019 - 17:25

Hyundai unveils walking car concept at CES 2019 that could be the first responder in natural disasters

South Korean carmaker Hyundai has revealed its concept for a vehicle with robotic legs that could save lives as a first responder in natural disaster zones. Read more

Bran antioxidant keeps food fresh longer

Futurity.org - სამ, 08/01/2019 - 17:24

A natural antioxidant found in grain bran could preserve food longer and replace synthetic antioxidants currently in use, according to new research.

“Currently, there’s a big push within the food industry to replace synthetic ingredients with natural alternatives, and this is being driven by consumers,” says Andrew S. Elder, doctoral candidate in food science at Penn State.

“Consumers want clean labels—they want synthetic chemical-sounding ingredients removed because of the fact that they don’t recognize them, and that some of them (the ingredients) have purported toxicity,” Elder says.

rye grain branThe various stages of processing rye, from berries to alkylresorcinols (top left to bottom right): rye berries, rye chops (coarsely ground rye berries), rye bran, and alkylresorcinols (extracted and purified from rye bran). (Credit: Ben Chrisfield/Penn State) Natural preservative

The researchers studied a class of compounds called alkylresorcinols (AR). Plants such as wheat, rye, and barley produce ARs naturally to prevent mold, bacteria, and other organisms from growing on the grain kernels. The researchers wondered if ARs could also preserve food in the same way from a chemical standpoint.

Along with using more natural ingredients, the food industry is also supplementing more foods with healthy oils rich in omega-3 fatty acids. Adding these healthy oils to foods that normally wouldn’t have them could boost their health benefits. However, omega-3 rich oils have a shorter shelf life, which could cause the foods to spoil more rapidly.

“We’re taking something that’s usually discarded in a waste stream and turning it into something useful.”

“Most people consume omega-3s from marine sources,” says Elder. “As they break down, they can make the product smell and taste fishy. Consumers then throw these products out and don’t buy them again, and this results in an economic loss.”

Antioxidants are compounds that slow the rate at which omega-3 fatty acids degrade, preserving their health benefits and preventing food from spoiling as quickly. While consumers demand more natural ingredients, the food industry has struggled to find natural antioxidants that are as effective as synthetic ones.

“There are not many natural alternatives for synthetic antioxidants,” says Elder. “Our work is focused on identifying new natural antioxidants to extend the shelf life of food and meet consumer demands.”

Rye bran extractionObserving the solvent extraction of alkylresorcinols from rye bran. (Credit: Ben Chrisfield/Penn State) Trash to treasure

ARs have health benefits for humans as well and can help protect against cancer, according to a review that appears in European Food Research and Technology, making them ideal natural additives. ARs also come from the bran layer of cereal plants, which the food industry usually discards or uses for animal feed.

“Bran is often a waste stream,” says Elder. “We’re taking something that’s usually discarded in a waste stream and turning it into something useful.”

The team developed a technique to extract and purify ARs from rye bran, then studied how well ARs were able to preserve omega-3-rich oils in emulsions, where two fluids do not fully mix—for example, vinegar and oil. The researchers chose to study AR action in emulsions because most people consume oils as emulsions, such as salad dressings.

The researchers found that ARs did act as antioxidants in an emulsion, preventing omega-3 oils from spoiling as rapidly as they did in emulsions with no antioxidants added. Then, they compared ARs to two antioxidants widely used by the food industry—alpha-tocopherol or Vitamin E, a natural antioxidant; and butylated hydroxytoluene, a synthetic antioxidant. However, ARs were not as effective as either the natural or the synthetic antioxidant.

Although the ARs did not work as well as other antioxidants in this round of experiments, the researchers note that their AR extracts were not completely pure, which could have reduced their effectiveness. Also, the researchers used a blend of different ARs that had different molecular structures. Future work looking at different types of ARs will reveal whether an individual AR type is more or less effective than conventionally-used antioxidants.

“We’re trying to identify natural antioxidants that are consumer-friendly, safe, and effective,” says Elder. “We hope that one day this work will lead to ARs being available on the market and provide more options for the food industry to use.”

The research appears in Food Chemistry. The US Department of Agriculture National Institute of Food and Agriculture Federal Appropriations funded this work.

Source: Penn State

The post Bran antioxidant keeps food fresh longer appeared first on Futurity.

Bébés génétiquement modifiés : le chercheur chinois menacé de mort

Yahoo! Actualités: Les titres Sciences - სამ, 08/01/2019 - 17:23
He Jiankui, le chercheur chinois qui a annoncé en novembre dernier avoir fait naître des enfants génétiquement modifiés, pourrait être condamné à mort, selon la presse britannique. Le quotidien The...

Santé: et vous, votre exposome, il est comment ?

Yahoo! Actualités: Les titres Sciences - სამ, 08/01/2019 - 17:01
Une révolution est en marche : les scientifiques s'apprêtent à décrypter les effets précis de l'environnement sur la santé.

How is a rainbow formed?

Popsci.com - science - სამ, 08/01/2019 - 17:00
Science

These optical illusions require a mix of the right weather, eye direction, and luck.

Because of their colorful and unique display, rainbows have generated countless legends and myths throughout history. Among the most popular is the Irish folklore that…

The Shutdown Shows Just How Vital Government Scientists Are

Wired Science - სამ, 08/01/2019 - 17:00
As federal scientists sit at home, the many industries that rely on them are already beginning to feel their absence.
კატეგორიები:

All Sand on Earth Could Be Made of Star Stuff

Scientific American - სამ, 08/01/2019 - 17:00
Silica, a common ingredient in sand, concrete and glass, may have its origins in supernovae -- Read more on ScientificAmerican.com

Mangelnde Transparenz und umstrittene Teilnehmer auf Ditib-Konferenz in Köln

Wissen - FAZ.NET Frankfurter Algemeine - სამ, 08/01/2019 - 16:58
Die Ditib hat in Köln eine internationale Konferenz zur Zukunft der Muslime in Europa veranstaltet – unter Ausschluss der Öffentlichkeit und offenbar mit Teilnehmern aus dem radikalislamischen Spektrum. Nicht nur die Oberbürgermeisterin ist irritiert.

CES 2019 : les innovations technologiques brillent à Las Vegas

Yahoo! Actualités: Les titres Sciences - სამ, 08/01/2019 - 16:57
Les écrans souples, pliables ou enroulables, comme celui de cette télévision sont les stars de l'édition 2019 du salon de l'Électronique de Las Vegas (États-Unis), le Consumer Electronics Show. Écrans flexibles pour tous formats, télévisions, tablettes ou smartphones, étaient présentés sous forme de prototypes l'an dernier, mais cette fois il s'agit de modèles commercialisables. Pour installer cet écran enroulable au milieu de votre salon, il faudra investir autour de 12 000 euros. Robots humanoïdes Outre les écrans flexibles, d'autres innovations poursuivent leur développement, tels les systèmes qui rendent nos maisons et nos voitures intelligentes. Les montres, les enceintes et les objets connectés occuperont aussi le devant de la scène. Les assistants vocaux et les robots humanoïdes font aussi leur show. Quelques gadgets parcourent les allées du salon. Ainsi, une valise autonome, que vous n'aurez pas à porter, vous suivra partout.

საპენსიო რეფორმა: რამდენად გათვლილია რისკები

1 იანვრიდან 2 %-იანი საპენსიო შენატანის გადახდა ყველა დასაქმებულს, მის დამსაქმებელსა და სახელმწიფოს ევალება. საპენსიო სააგენტოს ვებგვერდზე უკვე ჩაეშვა საპენსიო შენატანების ადმინისტრირების ელექტრონული სისტემა - დამსაქმებელს ახლა შეუძლია სისტემაში რეგისტრაციის გავლა, თუმცა საპენსიო რეფორმასთან დაკავშირებით კითხვა ჯერ კიდევ ბევრია. გიორგი გვახარიას სტუმარია საპენსიო სააგენტოს დირექტორი ლევან სურგულაძე. ჩვენს ყოველდღიურ პროგრამაში „საუბარი თავისუფლებაზე“ იგი აღიარებს, რომ საზოგადოებას ძალზე...

Biodiversität: Vor der Tür leben Tausende unbekannte Arten

SPIEGEL ONLINE - Wissenschaft - სამ, 08/01/2019 - 16:51
Knapp zwei Millionen Tier- und Pflanzenarten weltweit kennen Forscher bisher. Doch es existieren wohl mindestens doppelt so viele. Unbekannte Spezies gibt es nicht nur in den Tropen - sondern auch in Deutschland.

Mais comment font les abeilles pour réussir des virages parfaits sans partir dans le décor?

Yahoo! Actualités: Les titres Sciences - სამ, 08/01/2019 - 16:49
À l'instar des mouches, des chevaux et des chauves-souris, ces hyménoptères adaptent leur vitesse pour ne ne pas être déstabilisées par la force centrifuge. La force centrifuge est une petite sournoise. C'est elle qui, par exemple, nous fait risquer la sortie de route si nous abordons trop rapidement un virage en ...
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