Amazing Science
698.1K views | +699 today
 
Rescooped by Dr. Stefan Gruenwald from Longevity science
onto Amazing Science
Scoop.it!

Engineered artificial human livers for drug testing and discovery

Engineered artificial human livers for drug testing and discovery | Amazing Science | Scoop.it

Institute of Bioengineering and Nanotechnology (IBN) researchers have engineered an artificial human liver that mimics the natural tissue environment closely.

 

The development makes it possible for companies to predict the toxicity of new drugs earlier, potentially speeding up the drug development process and reducing the cost of manufacturing

 

 


Via Ray and Terry's
more...
No comment yet.
Amazing Science
Amazing science facts - 3D_printing • aging • AI • anthropology • art • astronomy • bigdata • bioinformatics • biology • biotech • chemistry • computers • cosmology • education • environment • evolution • future • genetics • genomics • geosciences • green_energy • history • language • map • material_science • math • med • medicine • microscopy • nanotech • neuroscience • paleontology • photography • photonics • physics • postings • robotics • science • technology • video
Your new post is loading...
Scooped by Dr. Stefan Gruenwald
Scoop.it!

20,000+ FREE Online Science and Technology Lectures from Top Universities

20,000+ FREE Online Science and Technology Lectures from Top Universities | Amazing Science | Scoop.it

FOR FULL GENOME SEQUENCING CONTACT DIAGNOMICS

(www.diagnomics.com)

Toll Free:1-800-605-8422  FREE
Regular Line:1-858-345-4817

  

 

NOTE: To subscribe to the RSS feed of Amazing Science, copy http://www.scoop.it/t/amazing-science/rss.xml into the URL field of your browser and click "subscribe".

 

This newsletter is aggregated from over 1450 news sources:

http://www.genautica.com/links/1450_news_sources.html

 

All my Tweets and Scoop.It! posts sorted and searchable:

http://www.genautica.com/tweets/index.html

 

••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

You can search through all the articles semantically on my

archived twitter feed

••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

NOTE: All articles in the amazing-science newsletter can also be sorted by topic. To do so, click the FIND buntton (symbolized by the FUNNEL on the top right of the screen)  and display all the relevant postings SORTED by TOPICS.

 

You can also type your own query:

 

e.g., you are looking for articles involving "dna" as a keyword

 

http://www.scoop.it/t/amazing-science/?q=dna

 

Or 

CLICK on the little

FUNNEL symbol at the

 

==================================================

 

***MOST READS***

• 3D-printing • aging • AI • anthropology • art • astronomy • bigdata • bioinformatics • biology • biotech • chemistry • computers • cosmology • education • environment • evolution • future • genetics • genomics • geosciencesgreen-energy • history • language • mapmaterial-science • math • med • medicine • microscopy • nanotech • neuroscience • paleontology • photography • photonics • physics • postings • robotics • science • technology • video 

more...
Siegfried Holle's curator insight, July 4, 2014 8:45 AM

Your knowledge is your strength and power 

Saberes Sin Fronteras OVS's curator insight, November 30, 2014 5:33 PM

Acceso gratuito a documentos de las mejores universidades del mundo

♥ princess leia ♥'s curator insight, December 28, 2014 11:58 AM

WoW  .. Expand  your mind!! It has room to grow!!! 

Scooped by Dr. Stefan Gruenwald
Scoop.it!

A Sonic Hot Plasma Boom Half as Old as the Universe Itself

A Sonic Hot Plasma Boom Half as Old as the Universe Itself | Amazing Science | Scoop.it
That’s quite a sonic boom, particularly given that the speed of sound in the hot plasma is around 2 million miles per hour!

 

In a normal cluster, the three components (galaxies, ICM, and dark matter) all lie on top of one another. But when two clusters collide, the components can separate. Dark matter only feels the pull of gravity, but the ICM also experiences friction and gas pressure. The dark matter components whiz past one another while the ICM sticks together, as in the famous example of the Bullet Cluster, shown above. It’s like if two water balloons collide: the rubber (ICM) stays put in the middle, while the water (dark matter) is free to keep flying past.

 

The authors of a recent paper are catching this process in action. Specifically, they measure theshockwave in the ICM gas from the collision of two galaxy clusters, in “El Gordo”. The ICM, like any gas, has a natural sound speed (which depends on its temperature). When gas moves faster than its sound speed, it creates shockwaves, where the pressure builds significantly and the gas is superheated. This same process is what creates a sonic boom on Earth.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

New flexible material can make any window 'smart'

New flexible material can make any window 'smart' | Amazing Science | Scoop.it

Researchers in the Cockrell School of Engineering at The University of Texas at Austin have invented a new flexible smart window material that, when incorporated into windows, sunroofs, or even curved glass surfaces, will make these structures "smart".

 

Delia Milliron, an associate professor in the McKetta Department of Chemical Engineering, and her team's advancement is a new low-temperature process for coating the new smart material on plastic, which makes it easier and cheaper to apply than conventional coatings made directly on the glass itself. The team demonstrated a flexible electrochromic device, which means a small electric charge (about 4 V) can lighten or darken the material and control the transmission of heat-producing, near-infrared radiation. Such smart windows are aimed at saving on cooling and heating bills for homes and businesses.

 

The research team is an international collaboration, including scientists at the European Synchrotron Radiation Facility and CNRS in France, and Ikerbasque in Spain. Researchers at UT Austin's College of Natural Sciences provided key theoretical work.

 

Milliron and her team's low-temperature process generates a material with a unique nanostructure, which doubles the efficiency of the coloration process compared with a coating produced by a conventional high-temperature process. It can switch between clear and tinted more quickly, using less power.

The new electrochromic material, like its high-temperature processed counterpart, has an amorphous structure, meaning the atoms lack any long-range organization as would be found in a crystal. However, the new process yields a unique local arrangement of the atoms in a linear, chain-like structure.

 

Whereas conventional amorphous materials produced at high temperature have a denser three-dimensionally bonded structure, the researchers' new linearly structured material, made of chemically condensed niobium oxide, allows ions to flow in and out more freely. As a result, it is twice as energy efficient as the conventionally processed smart window material.

At the heart of the team's study is their rare insight into the atomic-scale structure of the amorphous materials, whose disordered structures are difficult to characterize.

 

Because there are few techniques for characterizing the atomic-scale structure sufficiently enough to understand properties, it has been difficult to engineer amorphous materials to enhance their performance.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Carp undergo ‘reverse evolution’ to get scales back

Carp undergo ‘reverse evolution’ to get scales back | Amazing Science | Scoop.it

Evolution is a slow process, often taking thousands or even millions of years. But it can be quick when it needs to be. Take the case of the common carp (Cyprinus carpio). The species, like most fish, is covered in scales, but medieval European monks selectively bred carp centuries ago to produce ones with fewer scales, thus making them easier to gut and cook. Starting in 1912, these “mirror carp”—so named for their smooth sides—were introduced to Madagascar, where no carp existed, for fish farming, and they quickly spread throughout the island.

 

However, by the late 1950s, people observed the mirror carp’s descendants “degenerating” into more scaled fish. In a study, published today in the Proceedings of the Royal Society B, researchers collected nearly 700 wild and farmed carp from across Madagascar and studied their scale patterns and genotypes. Roughly 65% of the wild carp, which mostly descended from the original mirror carp released into the wild, were fully scaled, despite all still carrying the genetic mutation that originally turned their ancestors into mirror carp.

 

The newly scaled carp had evolved back their scales through different genes in 100 years, or roughly 40 carp generations, the team concludes. Scaled carp have been shown to survive better in the wild than mirror carp, likely because of the protection that scales offer from predators and parasites, and their reappearance shows just how much pressure a creature’s environment can put on an animal to quickly evolve.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

„Artificial Atom“ Created in Graphene

„Artificial Atom“ Created in Graphene | Amazing Science | Scoop.it

In a tiny quantum prison, electrons behave quite differently as compared to their counterparts in free space. They can only occupy discrete energy levels, much like the electrons in an atom -- for this reason, such electron prisons are often called "artificial atoms." Artificial atoms may also feature properties beyond those of conventional ones, with the potential for many applications for example in quantum computing. Such additional properties have now been shown for artificial atoms in the carbon material graphene. The results have been published in the journal Nano Letters, the project was a collaboration of scientists from TU Wien (Vienna, Austria), RWTH Aachen (Germany) and the University of Manchester (GB).

 

"Artificial atoms open up new, exciting possibilities, because we can directly tune their properties," says Professor Joachim Burgdörfer (TU Wien, Vienna). In semiconductor materials such as gallium arsenide, trapping electrons in tiny confinements has already been shown to be possible. These structures are often referred to as "quantum dots." Just like in an atom, where the electrons can only circle the nucleus on certain orbits, electrons in these quantum dots are forced into discrete quantum states.

Even more interesting possibilities are opened up by using graphene, a material consisting of a single layer of carbon atoms, which has attracted a lot of attention in the last few years.

 

"In most materials, electrons may occupy two different quantum states at a given energy. The high symmetry of the graphene lattice allows for four different quantum states. This opens up new pathways for quantum information processing and storage" explains Florian Libisch from TU Wien. However, creating well-controlled artificial atoms in graphene turned out to be extremely challenging.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Could Hydrogen Soon Be Classed as a Precious Metal?

Could Hydrogen Soon Be Classed as a Precious Metal? | Amazing Science | Scoop.it

Hydrogen is the first chemical element listed in the periodic table and has the atomic number of 1.  Up until now, hydrogen has usually been classed as a gas or liquid, but scientists are now extremely close to producing the first ever sample of solid metallic hydrogen. Their progress so far has been achieved through the use of powerful lasers, electrical impulses, and other state-of-the-art equipment.

 

As research continues, scientists uncover more about the properties of hydrogen and how it can benefit us as humans. It is a simple element that has the ability to change phases based on temperature and pressure and could be the next big superconductor.  Others that are currently used on MRIs and the Large Hadron Collider only work when they are cooled to extremely low temperatures. But with metallic hydrogen, it has the potential to act as a superconductor just at room temperature.

 

Various techniques and experiments are being conducted at the moment to try and be the first to produce metallic hydrogen successfully.  One of the ways that are being trialed involves a diamond anvil.  Here two tapered diamonds are used to exert intense pressure onto the sample of hydrogen, but this achieves the fourth phase of solid hydrogen, not metallic hydrogen, so more work is still needed here.  Others have begun to use lasers to blast samples of hydrogen, therefore increasing the pressure and temperature temporarily.

 

Although all of these experiments showed some evidence of metallic behavior, it was only liquid metal.  Other techniques involve using intense bursts of electrical power, as the Z Machine at Sandia National Laboratories, to force a metal plate into the hydrogen samples.  Scientists are confident that metallic hydrogen exists in the solar system, it is now just a case of reproducing it.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Global Initiative Seeks 1,000 New Cancer Models

Global Initiative Seeks 1,000 New Cancer Models | Amazing Science | Scoop.it

The effort will use next-generation cell-culture methods and fresh patient samples.

 

An international collaboration of cancer-research heavy-weights aims to grow 1,000 new cell lines for scientists to study — and that could be just the beginning. The Human Cancer Models Initiative announced its pilot project on July 11, and intends to complete the initial 1,000 models within 3 years. Members of the initiative include the US National Cancer Institute (NCI) in Bethesda, Maryland; Cancer Research UK in London; the Wellcome Trust Sanger Institute in Hinxton, UK; and Hubrecht Organoid Technology of Utrecht in the Netherlands.

 

The initial goal of 1,000 cell lines would roughly double the world’s collection of accessible cancer cell models, says Louis Staudt, head of the NCI’s Center for Cancer Genomics. But if all goes well during the pilot, the project will generate thousands more. Staudt estimates that researchers need about 10,000 models to fully capture the diversity of relatively common genetic subtypes of cancer. “Whether we actually will push into that depends a lot upon how easy and valuable the cell lines are from the pilot,” he says.

 

The initiative’s models will offer several improvements over most available cell lines. Each line will be matched with clinical data about the donor patient, and how they responded to treatment. The project will also use cutting-edge techniques to generate its models, which will include 3D cultures called organoids, and cells that have been reprogrammed to grow indefinitely in culture.

 

The hope is that these features will better reflect human cancers, enabling the cells to be used to model disease, screen for new drugs and determine which treatments are suited for which cancers.

more...
Rescooped by Dr. Stefan Gruenwald from Fragments of Science
Scoop.it!

Hybrid system designed to harvest 'full spectrum' of solar energy

Hybrid system designed to harvest 'full spectrum' of solar energy | Amazing Science | Scoop.it
A new concept could bring highly efficient solar power by combining three types of technologies that convert different parts of the light spectrum and also store energy for use after sundown.

Combining the technologies could make it possible to harness and store far more of the spectrum of sunlight than is possible using any one of the technologies separately.

"Harvesting the full spectrum of sunlight using a hybrid approach offers the potential for higher efficiencies, lower power production costs, and increased power grid compatibility than any single technology by itself," said Peter Bermel, an assistant professor in Purdue University's School of Electrical and Computer Engineering. "The idea is to use technologies that, for the most part exist now, but to combine them in a creative way that allows us to get higher efficiencies than we normally would."

The approach combines solar photovoltaic cells, which convert visible and ultraviolet light into electricity, thermoelectric devices that convert heat into electricity, and steam turbines to generate electricity. The thermoelectric devices and steam turbines would be driven by heat collected and stored using mirrors to focus sunlight onto a newly designed "selective solar absorber and reflector."

"This is a spectrally selective system, so it is able to efficiently make use of as much of the spectrum as possible," he said. "The thermal storage allows for significant flexibility in the time of power generation, so the system can produce power for hours after sunset, providing a consistent source of power throughout the day."

Findings from the research are detailed in a paper with an advance online publication date of Aug. 15, and the paper is scheduled to appear in a future print issue of the journal Energy & Environmental Science.

Via Mariaschnee
more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

New kind of substances inhibits viruses and bacteria

New kind of substances inhibits viruses and bacteria | Amazing Science | Scoop.it

A new class of substances is effective against both the AIDS pathogen, HIV, and antibiotics-resistant MRSA bacteria. These two pathogensoften occur together. Scientists hope that it may be possible to control them with a single drug in the future. Scientists of the Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) developed so-called dual agents that inhibit the growth of both types of pathogens. They describe their findings in the renowned Journal of Medicinal Chemistry. The HIPS is the Saarbrücken branch of the Helmholtz Centre for Infection Research (HZI), which has its headquarters in Braunschweig. It was founded jointly by the HZI and Saarland University in 2009.

 

The human immunodeficiency virus HIV is one of the most dangerous and widespreadpathogens throughout the world. Some 37 million people are host to the virus and 1.2 million were killed by this disease in 2014 alone. Meanwhile, both the proliferation of the pathogen and the progression of the disease can be halted through a combination therapy, but the viruses show an increasing trend to develop resistance and no longer respond to the medications used against them.

 

The notorious MRSA bacteria, i.e. methicillin-resistant Staphylococcus aureus strains, show similar persistence as many common antibiotics have become ineffective. HIV patients, whose immune systemhas already been weakened by the disease, are often additionally afflicted by MRSA pathogens. These co-infections are very problematic and difficult to treat. "Resistance to the common therapies is quite widespread amongst both the viruses and the MRSA bacteria, which means that the co-infection is very difficult to control," explains HZI scientist Prof Rolf Hartmann, who is the head of the "Drug Design and Optimization" department at the HIPS. "In addition, it is necessary to carefully consider the interactions between the medications given to the patients."

more...
No comment yet.
Rescooped by Dr. Stefan Gruenwald from Vincill-Science
Scoop.it!

Microbe-ID: an open source toolbox for microbial genotyping and species identification

Microbe-ID: an open source toolbox for microbial genotyping and species identification | Amazing Science | Scoop.it

Development of tools to identify species, genotypes, or novel strains of invasive organisms is critical for monitoring emergence and implementing rapid response measures. Molecular markers, although critical to identifying species or genotypes, require bioinformatic tools for analysis. However, user-friendly analytical tools for fast identification are not readily available.

 

To address this need, we created a web-based set of applications called Microbe-ID that allow for customizing a toolbox for rapid species identification and strain genotyping using any genetic markers of choice. Two components of Microbe-ID, named Sequence-ID and Genotype-ID, implement species and genotype identification, respectively. Sequence-ID allows identification of species by using BLAST to query sequences for any locus of interest against a custom reference sequence database.

 

Genotype-ID allows placement of an unknown multilocus marker in either a minimum spanning network or dendrogram with bootstrap support from a user-created reference database.

 

Microbe-ID can be used for identification of any organism based on nucleotide sequences or any molecular marker type and several examples are provided. We created a public website for demonstration purposes called Microbe-ID (microbe-id.org) and provided a working implementation for the genus Phytophthora (phytophthora-id.org).

 

In Phytophthora-ID, the Sequence-ID application allows identification based on ITS or cox spacer sequences. Genotype-ID groups individuals into clonal lineages based on simple sequence repeat (SSR) markers for the two invasive plant pathogen species P. infestans and P. ramorum. All code is open source and available on github and CRAN. Instructions for installation and use are provided at https://github.com/grunwaldlab/Microbe-ID.


Via Stéphane Hacquard, Jean-Michel Ané, Eric Vincill
more...
M. Philip Oliver's curator insight, August 20, 2:30 PM

Thank God! I was waiting for this..

Scooped by Dr. Stefan Gruenwald
Scoop.it!

Newly discovered material property may lead to high temp superconductivity

Newly discovered material property may lead to high temp superconductivity | Amazing Science | Scoop.it

Researchers at the U.S. Department of Energy's (DOE) Ames Laboratory have discovered an unusual property of purple bronze that may point to new ways to achieve high temperature superconductivity. While studying purple bronze, a molybdenum oxide, researchers discovered an unconventional charge density wave on its surface.

 

A charge density wave (CDW) is a state of matter where electrons bunch together in a repeating pattern, like a standing wave of surface of water. Superconductivity and charge density waves share a common origin, often co-exist, and can compete for dominance in certain materials.

 

Conventional CDWs and superconductivity both arise from electron-phonon interactions, the interaction of electrons with the vibrations of the crystal lattice. Electron-electron interactions are the likely origin of unconventional, high-temperature superconductivity such as found in copper- and iron-based compounds.

 

Unconventional, electron-electron driven CDW are extremely rare and its discovery here is important, because the material showed an 'extraordinary' increase of CDW transition temperature from 130K (-143C) to 220K (-53C) and a huge increase of energy gap at the surface.

 

Both are properties essential for CDW and high-temperature superconductivity, explained Adam Kaminski, Ames Laboratory scientist and professor in the Department of Physics and Astronomy at Iowa State University.

 

"This was an accidental but very exciting discovery," said Kaminski. "We were studying this material because its one-dimensional structure makes it quite interesting. We saw strange things happening to the electronic band structure, but when we looked at the surface we were stunned by extraordinary enhancement of transition temperature and energy gap."

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

New Chinese Plant Wants to Clone 1 Million Cows Annually

New Chinese Plant Wants to Clone 1 Million Cows Annually | Amazing Science | Scoop.it
The world’s largest cloning plant is expected to clone 1 million cattle annually and is currently under construction in China.

 

Imagine one million identical cows marching shoulder to shoulder and rib to rib down a path to the slaughterhouse. Imagine one million identical cows getting the same idea simultaneously to turn around and storm the cloning plant that created them. Somewhere in between is what probably will happen when the world’s largest cloning plant, currently under construction in China, goes into full operation in early 2016.


Plant where 1 million cows will be cloned annually

The $31 million plant is being built in Tianjin (160 km (100 miles) from Beijing) by BoyaLife, a three-year-old biotech firm specializing in stem cell and regenerative medicine, biological products, drug innovation and hereditary diseases research. The plan for the 14,000 square meter (150,000 sq. ft.) plant is to produce 100,000 cloned cattle embryos the first year and ramp quickly up to a million annually to satisfy China’s rapidly-growing demand for beef.

 

In addition to cattle, the company will clone pet dogs, police dogs, racehorses and “non-human primates,” with the somewhat altruistic goal of being the first to someday clone endangered pandas.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Natural scale caterpillar soft robot is powered and controlled with light

Natural scale caterpillar soft robot is powered and controlled with light | Amazing Science | Scoop.it
Researchers at the Faculty of Physics at the University of Warsaw, using the liquid crystal elastomer technology, originally developed in the LENS Institute in Florence, demonstrated a bioinspired micro-robot capable of mimicking caterpillar gaits in natural scale. The 15-millimeter long soft robot harvests energy from green light and is controlled by spatially modulated laser beam. Apart from travelling on flat surfaces, it can also climb slopes, squeeze through narrow slits and transport loads.

For decades scientists and engineers have been trying to build robots mimicking different modes of locomotion found in nature. Most of these designs have rigid skeletons and joints driven by electric or pneumatic actuators. In nature, however, a vast number of creatures navigate their habitats using soft bodies - earthworms, snails and larval insects can effectively move in complex environments using different strategies. Up to date, attempts to create soft robots were limited to larger scale (typically tens of centimeters), mainly due to difficulties in power management and remote control.

Liquid Crystalline Elastomers (LCEs) are smart materials that can exhibit large shape change under illumination with visible light. With the recently developed techniques, it is possible to pattern these soft materials into arbitrary three dimensional forms with a pre-defined actuation performance. The light-induced deformation allows a monolithic LCE structure to perform complex actions without numerous discrete actuators.

Researchers from the University of Warsaw with colleagues from LESN (Italy) and Cambridge (UK) have now developed a natural-scale soft caterpillar robot with an opto-mechanical liquid crystalline elastomer monolithic design. The robot body is made of a light sensitive elastomer stripe with patterned molecular alignment. By controlling the travelling deformation pattern the robot mimics different gaits of its natural relatives. It can also walk up a slope, squeeze through a slit and push objects as heavy as ten times its own mass, demonstrating its ability to perform in challenging environments and pointing at potential future applications.
more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Gravitational waves will bring the extreme universe into view – Daniel Hoak | Aeon Ideas

The first direct detection of gravitational waves on 14 September 2015 proved that massive objects can ripple the structure of space, verifying a key prediction of Albert Einstein’s general theory of relativity. The second detection, made on 26 December 2015 and announced this June, firmly established gravitational waves as a new window to the Universe. But even more exciting are the detections yet to come: the thousands of signals that should soon be observed by the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo experiments. They will transform our understanding of black holes, neutron stars, supernova explosions, and perhaps even the origin and fate of the cosmos itself.

 

Changes to the fields of physics and astronomy are already being felt. The two events reported so far have significantly increased the number of known stellar-mass black holes, and have demonstrated that black holes can form tight pairs and merge violently within the lifetime of the Universe; such mergers are the inferred cause of the September 14 and December 26 signals. Drawing on data from those two events, my colleagues in the LIGO and Virgo collaborations have tested general relativity in novel ways, far outside our terrestrial experience. And we have shown that black holes collide more often than expected, which has lead some researchers to speculate that black holes might be abundant enough to qualify as a variety of dark matter.

 

As with any new observational tool, the most important discoveries from the new detectors will surely be the ones that are unexpected. But we also have a good sense of the amazing things that the gravitational universe will tell us, even in the absence of surprises.

 

We can be certain that we will detect many more merging pairs of black holes comparable to the two already detected. The current instruments are about three times less sensitive than their full potential. At their ultimate sensitivity, the two LIGO detectors (in Louisiana and Washington state) and the Virgo experiment (near Pisa in Italy) will register dozens to hundreds of black-hole events per year. This large sample will yield a detailed census of black holes, and will allow astronomers to characterize their population all across the Universe, evaluating theories of how they form.

 

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Scientists say they’ve found a planet orbiting Proxima Centauri, our closest neighbor

Scientists say they’ve found a planet orbiting Proxima Centauri, our closest neighbor | Amazing Science | Scoop.it

Scientists have discovered what they believe to be a new planet, the closest one ever detected outside our solar system. It is a small, rocky planet not unlike our own, orbiting the sun's closest stellar neighbor.

 

Astronomers have long suspected that the star Proxima Centauri could be home to a planet, but proof had been elusive. Dim red dwarf stars like Proxima have been found to host billions of small, closely orbiting planets throughout the galaxy. Now a study published Wednesday in the journal Natureprovides the best evidence yet for a tantalizingly close target on which to seek alien life.

 

"It's so inspiring, it's our closest star," Lisa Kaltenegger, a Cornell astronomer who wasn't involved in the new study, told The Washington Post. "A planet next door. How much more inspiring can it get?"

 

Located about 4.25 light-years from the sun, Proxima is less famous than the Alpha Centauri binary star system it hangs around with. But while Alpha Centauri is made up of two rather sun-like stars, Proxima is actually closer. It used to be that scientists were far more interested in stars like our own sun than in dim little dwarves like Proxima, but the times are changing — these types of stars are far more common in the galaxy, and scientists now believe they might be just as capable of hosting life as more familiar looking suns.

 

The proposed planet comes to light not long after a would-be-world orbiting Alpha Centauri B was determined to be nothing but a fluke in the data. Scientists know that most stars in the galaxy harbor planets, but we've had difficulty finding our closest companions in the cosmos.

 

Proxima b will no doubt be dubbed "Earthlike" by many, but let's not jump the gun. Here's what we know: The planet, based on statistical analysis of the behavior of its star, is quite likely to exist. Beyond that, we know very little.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Light and matter merge in quantum coupling

Light and matter merge in quantum coupling | Amazing Science | Scoop.it
Where light and matter intersect, the world illuminates. Where light and matter interact so strongly that they become one, they illuminate a world of new physics, according to Rice University scientists.

 

Rice physicists are closing in on a way to create a new condensed matter state in which all the electrons in a material act as one by manipulating them with light and a magnetic field. The effect made possible by a custom-built, finely tuned cavity for terahertz radiation shows one of the strongest light-matter coupling phenomena ever observed.

 

The work by Rice physicist Junichiro Kono and his colleagues is described in Nature Physics. It could help advance technologies like quantum computers and communications by revealing new phenomena to those who study cavity quantum electrodynamics and condensed matter physics, Kono said.

 

Condensed matter in the general sense is anything solid or liquid, but condensed matter physicists study forms that are much more esoteric, like Bose-Einstein condensates. A Rice team was one of the first to make a Bose-Einstein condensate in 1995 when it prompted atoms to form a gas at ultracold temperatures in which all the atoms lose their individual identities and behave as a single unit.

 

The Kono team is working toward something similar, but with electrons that are strongly coupled, or "dressed," with light. Qi Zhang, a former graduate student in Kono's group and lead author of the paper, designed and constructed an extremely high-quality cavity to contain an ultrathin layer of gallium arsenide, a material they've used to study superfluorescence. By tuning the material with a magnetic field to resonate with a certain state of light in the cavity, they prompted the formation of polaritons that act in a collective manner.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

New theory of how we move through time

New theory of how we move through time | Amazing Science | Scoop.it

Associate Professor Dr Joan Vaccaro, of Griffith's Centre for Quantum Dynamics, has solved an anomaly of conventional physics and shown that a mysterious effect called 'T violation' could be the origin of time evolution and conservation laws.

"I begin by breaking the rules of physics, which is rather bold I have to admit, but I wanted to understand time better and conventional physics can't do that," Dr Vaccaro says.

 

"I do get conventional physics in the end though. This means that the rules I break are not fundamental. It also means that I can see why the universe has those rules. And I can also see why the universe advances in time."

 

In her research published in The Royal Society Dr Vaccaro says T violation, or a violation of time reversal (T) symmetry, is forcing the universe and us in it, into the future. "If T violation wasn't involved we wouldn't advance in time and we'd be stuck at the Big Bang, so this shows how we escaped the Big Bang.

 

"I found the mechanism that forces us to go to the future, the reason why you get old and the reason why we advance in time." "The universe must be symmetric in time and space overall. But we know that there appears to be a preferred direction in time because we are incessantly getting older not younger."

 

The anomaly Dr Vaccaro solves involves two things not accounted for in in conventional physical theories -- the direction of time, and the behavior of the mesons, which decay differently if time went in the opposite direction.

 

Experiments show that the behavior of mesons depends on the direction of time; in particular, if the direction of time was changed then their behavior would also," she says.

 

"Conventional physical theories can accommodate only one direction of time and one kind of meson behavior, and so they are asymmetric in this regard. But the problem is that the universe cannot be asymmetric overall.

 

"This means that physical theories must be symmetric in time. To be symmetric in time they would need to accommodate both directions of time and both meson behaviors. This is the anomaly in physics that I am attempting to solve."

 

Dr Vaccaro is presenting her work at the Soapbox Science event held in Brisbane as part of National Science Week, titled "The meaning of time: why the universe didn't stay put at the big bang and how it is 'now' and no other time."

 

Without any T violation the theory gives a very strange universe. An object like a cup can be placed in time just like it is in space.

"It just exists at one place in space and one point in time. There is nothing unusual about being at one place in space, but existing at one point in time means the object would come into existence only at that point in time and then disappear immediately.

 

"This means that conservation of matter would be violated. It also means that there would be no evolution in time. People would only exist for a single point in time -- they would not experience a "flow of time."

 

When Dr Vaccaro adds T violation to the theory, things change dramatically. "The cup is now found at any and every time," she says,

 

"This means that the theory now has conservation of matter -- the conservation has emerged from the theory rather than being assumed. Moreover, objects change over time, cups chip and break, and people would grow old and experience a "flow of time." This means that the theory now has time evolution.

more...
Renato P. dos Santos's curator insight, Today, 7:36 AM
Share your insight
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Tunneling nanotubes between neurons enable the spread of Parkinson's disease via lysosomes

Tunneling nanotubes between neurons enable the spread of Parkinson's disease via lysosomes | Amazing Science | Scoop.it

Scientists from the Institut Pasteur have demonstrated the role of lysosomal vesicles in transporting α-synuclein aggregates, responsible for Parkinson's and other neurodegenerative diseases, between neurons. These proteins move from one neuron to the next in lysosomal vesicles which travel along the "tunneling nanotubes" between cells. These findings were published in The EMBO Journal on Aug. 22, 2016.

 

Synucleinopathies, a group of neurodegenerative diseases including Parkinson's disease, are characterized by the pathological deposition of aggregates of the misfolded α-synuclein protein into inclusions throughout the central and peripheral nervous system. Intercellular propagation (from one neuron to the next) of α-synuclein aggregates contributes to the progression of the neuropathology, but little was known about the mechanism by which spread occurs.

 

In this study, scientists from the Membrane Traffic and Pathogenesis Unit, directed by Chiara Zurzolo at the Institut Pasteur, used fluorescence microscopy to demonstrate that pathogenic α-synuclein fibrils travel between neurons in culture, inside lysosomal vesicles through tunneling nanotubes (TNTs), a new mechanism of intercellular communication.

 

After being transferred via TNTs, α-synuclein fibrils are able to recruit and induce aggregation of the soluble α-synuclein protein in the cytosol of cells receiving the fibrils, thus explaining the propagation of the disease. The scientists propose that cells overloaded with α-synuclein aggregates in lysosomes dispose of this material by hijacking TNT-mediated intercellular trafficking. However, this results in the disease being spread to naive neurons.

 

This study demonstrates that TNTs play a significant part in the intercellular transfer of α-synuclein fibrils and reveals the specific role of lysosomes in this process. This represents a major breakthrough in understanding the mechanisms underlying the progression of synucleinopathies.

 

These compelling findings, together with previous reports from the same team, point to the general role of TNTs in the propagation of prion-like proteins in neurodegenerative diseases and identify TNTs as a new therapeutic target to combat the progression of these incurable diseases.

more...
No comment yet.
Rescooped by Dr. Stefan Gruenwald from Limitless learning Universe
Scoop.it!

The mystery of why you can't remember being a baby

The mystery of why you can't remember being a baby | Amazing Science | Scoop.it

From the most dramatic moment in life – the day of your birth – to first steps, first words, first food, right up to nursery school, most of us can’t remember anything of our first few years. Even after our precious first memory, the recollections tend to be few and far between until well into our childhood. How come?

This gaping hole in the record of our lives has been frustrating parents and baffling psychologists, neuroscientists and linguists for decades. It was a minor obsession of the father of psychotherapy, Sigmund Freud, who coined the phrase ‘infant amnesia’ over 100 years ago.

 

Probing that mental blank throws up some intriguing questions. Did your earliest memories actually happen, or are they simply made up? Can we remember events without the words to describe them? And might it one day be possible to claim your missing memories back?


Via CineversityTV
more...
No comment yet.
Rescooped by Dr. Stefan Gruenwald from Geology
Scoop.it!

Abundant Oxygen Measured in a 12-Billion-Year-Old Galaxy

Abundant Oxygen Measured in a 12-Billion-Year-Old Galaxy | Amazing Science | Scoop.it

UCLA astronomers have made the first accurate measurement of the abundance of oxygen in a distant galaxy. Oxygen, the third-most abundant chemical element in the universe, is created inside stars and released into interstellar gas when stars die. Quantifying the amount of oxygen is key to understanding how matter cycles in and out of galaxies.

 

This research is published online in the Astrophysical Journal Letters, and is based on data collected at the W. M. Keck Observatory on Mauna Kea, in Hawaii.

 

"This is by far the most distant galaxy for which the oxygen abundance has actually been measured," said Alice Shapley, a UCLA professor of astronomy, and co-author of the study. "We're looking back in time at this galaxy as it appeared 12 billion years ago."

Knowing the abundance of oxygen in the galaxy called COSMOS-1908 is an important stepping stone toward allowing astronomers to better understand the population of faint, distant galaxies observed when the universe was only a few billion years old and galaxy evolution, Shapley said.


Via Catherine Russell
more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

NASA: July 2016 was the warmest July in 136 years of modern record-keeping

NASA: July 2016 was the warmest July in 136 years of modern record-keeping | Amazing Science | Scoop.it

July 2016 was the warmest July in 136 years of modern record-keeping, according to a monthly analysis of global temperatures by scientists at NASA's Goddard Institute for Space Studies (GISS) in New York.

 

Because the seasonal temperature cycle peaks in July, it means July 2016 also was warmer than any other month on record. July 2016's temperature was a statistically small 0.1 degrees Celsius warmer than previous warm Julys in 2015, 2011 and 2009.

“It wasn't by the widest of margins, but July 2016 was the warmest month since modern record keeping began in 1880,” said GISS Director Gavin Schmidt. “It appears almost a certainty that 2016 also will be the warmest year on record.”

 

The record warm July continued a streak of 10 consecutive months dating back to October 2015 that have set new monthly high-temperature records. Compared to previous years, the warmer global temperatures last month were most pronounced in the northern hemisphere, particularly near the Arctic region.

The monthly analysis by the GISS team is assembled from publicly available data acquired by about 6,300 meteorological stations around the world, ship- and buoy-based instruments measuring sea surface temperature, and Antarctic research stations. The modern global temperature record begins around 1880 because previous observations didn't cover enough of the planet.

Related LinksFor more information on NASA GISS's monthly temperature analysis, visit: data.giss.nasa.gov/gistemp.

For more information about NASA GISS, visit: www.giss.nasa.gov.

Click here to edit the content

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Rainbow galaxies reveal why cosmos is full of spirals

Rainbow galaxies reveal why cosmos is full of spirals | Amazing Science | Scoop.it

Psychedelic pictures of 30 galactic collisions show for the first time that merging galaxies often spawn disc-shaped offspring like our Milky Way.

 

These images show the carbon monoxide gas detected in neighboring galaxies – 40 to 600 million light years from Earth – in their final stages of merging. The colors show how this gas was moving: blue represents gas that is moving towards us, while red indicates gas that is moving away.

 

Out of 37 galaxies observed, these 30 all show gas rotating around the centre of the galaxy, meaning they are disc galaxies in the making.

 

“For the first time there is observational evidence for merging galaxies that could result in disc galaxies. This is a large and unexpected step towards understanding the mystery of the birth of disc galaxies,” says Junko Ueda from the Japan Society for the Promotion of Science. Ueda and her team made the observations using data from the ALMA radio telescope.

Computer simulations suggested that when galaxies merge, they usually form a single blob-shaped galaxy classed as “elliptical”. However, most of the galaxies in the universe are pancake-shaped “disc” galaxies, such as lenticular galaxies and our own spiral Milky Way. As this rogues’ gallery of galactic mergers shows, a disc-shaped offspring is a common result of a collision.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Biologists are close to reinventing the genetic code of life

Biologists are close to reinventing the genetic code of life | Amazing Science | Scoop.it

The term "life hacking" usually refers to clever tweaks that make your life more productive. But this week in Science, a team of scientists comes a step closer to the literal meaning: hacking the machinery of life itself. They have designed—though not completely assembled—a synthetic Escherichia coli genome that could use a protein-coding scheme different from the one employed by all known life. Requiring a staggering 62,000 DNA changes, the finished genome would be the most complicated genetic engineering feat so far. E. coli running this rewritten genome could become a new workhorse for laboratory experiments and a factory for new industrial chemicals, its creators predict.

 

Such a large-scale genomic hack once seemed impossible, but no longer, says Peter Carr, a bioengineer at the Massachusetts Institute of Technology Lincoln Laboratory in Lexington who is not involved with the project. "It's not easy, but we can engineer life at profound scales, even something as fundamental as the genetic code."

 

The genome hacking is underway in the lab of George Church at Harvard University, the DNA-sequencing pioneer who has become the most high-profile, and at times controversial, name in synthetic biology. The work takes advantage of the redundancy of life's genetic code, the language that DNA uses to instruct the cell's protein-synthesizing machinery. To produce proteins, cells "read" DNA's four-letter alphabet in clusters of three called codons. The 64 possible triplets are more than enough to encode the 20 amino acids that exist in nature, as well as the "stop" codons that mark the ends of genes. As a result, the genetic code has multiple codons for the same amino acid: the codons CCC and CCG both encode the amino acid proline, for example.

 

Church and others hypothesized that redundant codons could be eliminated—by swapping out every CCC for a CCG in every gene, for instance—without harming the cell. The gene that enables CCC to be translated into proline could then be deleted entirely. "There are a number of 'killer apps'" of such a "recoded" cell, says Farren Isaacs, a bioengineer at Yale University, who, with Church and colleagues, showed a stop codon can be swapped out entirely from E. coli.

 

The cells could be immune to viruses that impair bioreactors, for example, if crucial viral genes include now untranslatable codons. The changes could also allow synthetic biologists to repurpose the freed redundant codons for an entirely different function, such as coding for a new, synthetic amino acid.

 

For this study, Church's team decided to eliminate seven of the microbe's 64 codons. That target seemed like "a good balance" between the number of changes that appeared technically achievable and the number that might be too many for a cell to survive, says Matthieu Landon, one of Church's Ph.D. students. And the seven spare codons could eventually be repurposed to code up to four different unnatural amino acids.

 

But making so many changes, even with the latest DNA editing techniques such as CRISPR, still appeared impossible. Luckily, the cost of synthesizing DNA has plummeted over the past decade. So instead of editing the genome one site at a time, Church's team used machines to synthesize long stretches of the recoded genome from scratch, each chunk containing multiple changes.

 

The team has now turned to the laborious job of inserting these chunks into E. coli one by one and making sure that none of the genomic changes is lethal to the cells. The researchers have only tested 63% of the recoded genes so far, but remarkably few of the changes have caused trouble, they say.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Physicists reach lowest temperature ever recorded in solids using laser cooling

Physicists reach lowest temperature ever recorded in solids using laser cooling | Amazing Science | Scoop.it

Dr. Mansoor Sheik-Bahae, professor of physics and astronomy, along with his research group, are advancing a technique called optical refrigeration to reach cryogenic temperature. Essentially, the group is using laser light to chill a special type of crystal, which can then be attached to a device that requires constant and reliable cooling, like infrared detectors on satellites. What sets their technique apart is the temperatures it can cool to without having any moving parts.

 

“Right now, anything that cools other parts of a system has moving parts. Most of the time, there’s liquid running through it that adds vibrations which can impact the precision or resolution of the device,” explained Aram Gragossian, a research assistant in Sheik-Bahae’s lab. “But, when you have optical refrigeration, you can go to low temperatures without any vibrations and without any moving parts, making it convenient for a lot of applications.

 

Earlier this year, Sheik-Bahae, along with collaborators at UNM, and Los Alamos National Labs, reached the lowest temperatures ever recorded using an all-solid-state cryocooler – 91 kelvin or -296o Fahrenheit – temperatures that were previously only able to be reached using liquid nitrogen or helium. The research, Solid-state optical refrigeration to sub-100 Kelvin regime, was published in the journal of (Nature) Scientific Reports 6.

“Here at UNM, we are the only group in the world that’s been able to cool to cryogenic temperatures with an all-solid-state optical cryocooler,” said Alexander Albrecht, one of the paper’s co-authors and research assistant professor at UNM.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Exoplanet GJ 1132b Might Have a Thin Oxygen Atmosphere

Exoplanet GJ 1132b Might Have a Thin Oxygen Atmosphere | Amazing Science | Scoop.it

New research from the Harvard-Smithsonian Center for Astrophysics reveals that the Venus-like Exoplanet GJ 1132b might possess a thin, oxygen atmosphere – but no life due to its extreme heat.

 

The distant planet GJ 1132b intrigued astronomers when it was discovered last year. Located just 39 light-years from Earth, it might have an atmosphere despite being baked to a temperature of around 450 degrees Fahrenheit. But would that atmosphere be thick and soupy or thin and wispy? New research suggests the latter is much more likely.

 

Harvard astronomer Laura Schaefer (Harvard-Smithsonian Center for Astrophysics, or CfA) and her colleagues examined the question of what would happen to GJ 1132b over time if it began with a steamy, water-rich atmosphere.

 

Orbiting so close to its star, at a distance of just 1.4 million miles, the planet is flooded with ultraviolet or UV light. UV light breaks apart water molecules into hydrogen and oxygen, both of which then can be lost into space. However, since hydrogen is lighter it escapes more readily, while oxygen lingers behind.

 

“On cooler planets, oxygen could be a sign of alien life and habitability. But on a hot planet like GJ 1132b, it’s a sign of the exact opposite – a planet that’s being baked and sterilized,” said Schaefer.

 

Since water vapor is a greenhouse gas, the planet would have a strong greenhouse effect, amplifying the star’s already intense heat. As a result, its surface could stay molten for millions of years.

 

A “magma ocean” would interact with the atmosphere, absorbing some of the oxygen, but how much? Only about one-tenth, according to the model created by Schaefer and her colleagues. Most of the remaining 90 percent of leftover oxygen streams off into space, however some might linger.

 

“This planet might be the first time we detect oxygen on a rocky planet outside the solar system,” said co-author Robin Wordsworth (Harvard Paulson School of Engineering and Applied Sciences). If any oxygen does still cling to GJ 1132b, next-generation telescopes like the Giant Magellan Telescope and James Webb Space Telescope may be able to detect and analyze it.

 

The magma ocean-atmosphere model could help scientists solve the puzzle of how Venus evolved over time. Venus probably began with Earthlike amounts of water, which would have been broken apart by sunlight. Yet it shows few signs of lingering oxygen. The missing oxygen problem continues to baffle astronomers.

 

Schaefer predicts that their model also will provide insights into other, similar exoplanets. For example, the system TRAPPIST-1 contains three planets that may lie in the habitable zone. Since they are cooler than GJ 1132b, they have a better chance of retaining an atmosphere.

more...
No comment yet.
Scooped by Dr. Stefan Gruenwald
Scoop.it!

Astronomers captured a 'classical nova' explosion on camera

Astronomers captured a 'classical nova' explosion on camera | Amazing Science | Scoop.it
Polish astronomers, based in Chile, were performing a sky survey that intended the detection of dark matter. But they obtained much more, discovering the process of a classical nova explosion. Results are published in the science journal Nature as researchers collected images for the “Optical Gravitational Lensing Experiment“,  discovering they had a timeline that captured the rare event.
more...
No comment yet.