Lasers the Bragg Peak and Cancer Therapy

first_img Citation: Lasers, the Bragg Peak and Cancer Therapy (2008, November 6) retrieved 18 August 2019 from https://phys.org/news/2008-11-lasers-bragg-peak-cancer-therapy.html (PhysOrg.com) — “When a laser goes through a plasma,” John Cary tells PhysOrg.com, “it pushes electrons away. Then when it snaps back, it generates an electric wake behind the laser pulse, picking the electrons up and carrying them along.” Cary is a physics professor at the University of Colorado in Boulder, as well as the founder of Tech-X Corporation, a company that specializes in computational physics and simulation software. He is a member of a collaboration that wanted to see if it was possible to accelerate heavy ions with a laser. Laser Wakefield Acceleration: Channeling the Best Beams Ever “Accelerating electrons is easier, because they are light,” he says. “Instead, we wanted to see if there could be the possibility of doing this with protons and heavier nuclei.” The collaboration, a team from the Shanghai Institute of Optics and Fine Mechanics in China and Cary, produced a simulation outlining possibilities. The results of the simulation are reported in Physical Review Letters: “Generating Monoenergetic Heavy-Ion Bunches with Laser-Induced Electrostatic Shocks.”Cary says that the information found in the simulation may have a variety of applications. “But the most exciting application, and the one that many people are looking to use,” he points out, “is for use in cancer therapy.”The simulation shows that for heavier ions, it is possible to accelerate them, as well as control what is known as the Bragg Peak. “When you have a small charge to mass ratio,” Cary explains, “as an ion beam travels through matter, it deposits energy. At the end, just before it comes to rest, there is a very sharp peak of energy deposition.”This Bragg Peak is used in proton therapy to concentrate the energy on cancerous tumors to destroy them.But there can be a problem: “If the beam is not monoenergetic, the peak smears out, potentially overlapping healthy tissue, which can then be damaged,” Cary says. “Researchers are trying to narrow this peak so that it is more precise, destroying the tumor but not the surrounding healthy cells.” This new simulation implies that this could be possible: “We found that carbon may have what is needed. The configuration seems to have nice properties, with a small energy spread and a fair amount of beam.” Cary also points out that this work could lead to producing isotopes for other kinds of therapy, as well as provide the groundwork for particle beams for homeland security. “Particle beams could be used to scan ship containers coming into harbor for fissile material. The simulation indicates a direction for compact and mobile production of needed monoenergetic nuclei.”Of course, the next step is to try and replicate what was found in the simulation with an experiment using an actual laser. The technology exists to try the configuration out, Cary says: “This is within the regime of what lasers are being built to do now.” But it is nice to have an idea of what needs to be done before trying the experiment. “That’s the nice thing about simulations, especially with today’s powerful supercomputers, which permit very detailed simulations. You can mock up all sorts of scenarios and explore a lot more ‘what if’ scenarios if you don’t have to build it each time.”This is one “what if” researchers may be excited to start building.More information: Generating Monoenergetic Heavy-Ion Bunches with Laser-Induced Electrostatic Shocks, Phys. Rev. Lett. 101, 164802 (2008)link.aps.org/abstract/PRL/v101/e164802Copyright 2007 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com.center_img Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Could some entangled states be useless for quantum cryptography

first_img More information: Matthias Christandl, Norbert Schuch, and Andreas Winter, “Highly Entangled States with Almost No Secrecy,” Physical Review Letters (2010). Available online: link.aps.org/doi/10.1103/PhysRevLett.104.240405 “Entanglement, or quantum correlation, is responsible for enabling quantum key distribution, a method to distribute a perfectly secret key that can be used to encrypt messages,” Matthias Christandl tells PhysOrg.com via email. “We have now discovered that not every type of entanglement is useful for quantum key distribution… [W]e showed that sometimes particles can be very strongly entangled, but at the same time be nearly useless for cryptography!”Christandl is a scientist who recently moved from the University of Munich, Germany, to ETH Zurich, Switzerland. Christandl worked with Norbert Schuch at the Max Planck Institute for Quantum Physics in Garching, Germany, and with Andreas Winter at the University of Bristol in the U.K. and the National University of Singapore to illustrate an example of a quantum state that is entangled, but that does not offer the secrecy needed for quantum cryptography. Their work appears in Physical Review Letters: “Highly Entangled States with Almost No Secrecy.”So far, the findings are only a theoretical observation. “We studied the possibilities that the world of single atoms and weak bursts of light offers when security is concerned,” explains Christandl. The two particles that are used in this theoretical exploration are in what Christandl calls an “antisymmetric state.” Observing this entangled state in the laboratory may not be something that occurs anytime really soon, though. “This state may be difficult to create in the laboratory,” says Christandl, “as one needs a high number of maximally entangled particles in order to create the state. …However, the insights gained in this work might offer a route to new and better protocols for quantum cryptography.”Christandl and his colleagues are looking at ways to better understand how secrecy works in quantum physics. The idea that, theoretically, even high degrees of quantum entanglement may not lead to complete secrecy, could change the way that scientists view quantum cryptography. It could also encourage the study of different quantum states to determine which are better for quantum key distribution, and which should be avoided for such purposes.While there are no plans to set up an experiment to test this idea, Christandl thinks that the theoretical findings can help advance the study of quantum physics. “A better understanding might lead to novel quantum protocols and quantum technologies in the future.”The next step for Christandl and his peers is to look for entanglement that offers no secrecy. “This would push our findings to the extreme,” he says, “offering an analog of the famous ‘bound entanglement.’ Such a finding would conclusively revise the view that entanglement and secrecy go hand in hand.” Copyright 2010 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Explore furthercenter_img Too much entanglement can render quantum computers useless Citation: Could some entangled states be useless for quantum cryptography? (2010, July 5) retrieved 18 August 2019 from https://phys.org/news/2010-07-entangled-states-useless-quantum-cryptography.html (PhysOrg.com) — One of the widely accepted properties of quantum entanglement is secrecy. Since scientists and researchers began working with quantum key distribution, entanglement has been considered an essential part of keeping communications private. What if entanglement didn’t always mean secrecy, though? New work is shedding light on the nature of entanglement and quantum key distribution – and possibly proving that a high degree of entanglement does not necessarily lead to complete secrecy.last_img read more

Photons journeys across the universe help unravel cosmological mysteries

first_img Citation: Photons’ journeys across the universe help unravel cosmological mysteries (2014, February 14) retrieved 18 August 2019 from https://phys.org/news/2014-02-photons-journeys-universe-unravel-cosmological.html (Phys.org) —The faint background glow that exists throughout the Universe, called the Cosmic Microwave Background (CMB), is made of photons that have been scattering since the universe was just 400,000 years old. Now in a new paper, physicist Liang Dai at Johns Hopkins University in Baltimore, Maryland, has shown that the polarization of these photons is rotated as they travel by things such as gravity waves and cosmic matter flows. By accounting for this rotation effect when observing the CMB photons, scientists may be able to investigate parts of the Universe that might otherwise remain unknown. “The CMB is like a cosmic back light,” Dai told Phys.org. “When the CMB photons finally reach us today, they have traversed vast cosmic space, and are distorted by whatever lies in between. It is of great significance to study/measure these distortions (to both temperature and polarization) because we then learn about the distribution and evolution of the ‘stuff’ in between, and hence understand the more recent Universe.”This ‘stuff’ that distorts the CMB photons on their journey includes the large-scale structure of matter in the Universe, as well as less visible stuff, such as primordial gravity waves and vortical cosmic matter flows (for example, the circular collective movement of galaxies). “Gravity waves will tell us a lot about the very beginning of Universe, and vortical flows reveal a lot about the structure formation in the Universe,” Dai said.Dai’s theoretical results show that this ‘stuff’—gravity waves and vortical flows—distorts the polarization anisotropies of the CMB. The previous calculation of this effect was incomplete, but Dai’s work provides a complete and correct calculation of the polarization rotation effect.”When a photon travels in some direction, it oscillates in a plane perpendicular to that direction,” Dai explained. “However, there are still two independent planes in which it can oscillate (we call them two transverse directions), and the photon’s polarization state is about in which plane oscillation happens. “Suppose there is a distant source emitting photons polarized in one transverse direction. In flat space, the receiver will see exactly the polarized direction as it is at emission. But in a Universe filled with all kinds of ‘stuff,’ spacetime is slightly curved, so the receiver is going to see a slightly different polarized direction from that at emission. If one knows the original polarized direction, then one can measure this effect by seeing how the observed polarized direction differs from the original direction. Sometimes, we don’t know the original direction, but we still know the probabilistic distribution of original polarized direction. In that case, we can still determine in a statistical way whether the polarization plane has changed during the photon’s propagation.” Physics duo suggest using early universe inflation as graviton detector Polarization maps illustrating the rotation of photon polarization. Credit: Liang Dai. ©2014 American Physical Society The effects are not only limited to CMB photons, but could also apply to photons coming from other sources, such as radio emissions and quasars. “Like the CMB, 21-cm radio emissions are just another backlight that illuminates what is ‘in between’; the difference is that they are electromagnetic signals of different frequency and that they originate from places of lower redshift. But they can also be polarized due to scattering. In this sense, the same results can be applied to that case as well. “Unlike the CMB and 21-cm emissions, quasars are point-like back-lights,” he continued. “Sometimes, a single quasar appears in multiple images on the sky because it happens to be behind, e.g., a galaxy cluster. We call this situation strong lensing. The results of my paper imply that light from two distinct images of the same quasar will have slightly different polarizations because lights from both images follow different paths in spacetime. Although this is a second-order effect, it might be possible to measure this difference by interference techniques. Of course, in this situation the backlight reveals foreground structures instead of gravity waves.”In the future, Dai plans to investigate exactly how gravity waves distort and deflect photons traveling in the distant Universe.”There have been many studies on the geometrical effect of gravity waves, i.e., how they deflect light paths from distant sources,” he said. “Although this effect might eventually help in identifying gravity waves in the Universe, it is observationally very challenging; the effect is tiny because gravity wave amplitude decreases as the Universe expands as a whole. “The dynamical effect of gravity waves, on the other hand, has not been quite studied and understood. The dynamical effect is basically how gravity waves distort the motion of matter particles (not light), and hence affect the physical distribution of matter, not just the apparent distribution. Compared to the geometrical effect, the dynamical effect can take place at even earlier time, and can be more significant. Next I am very interested in studying this aspect of gravity waves, continuing the search for gravity waves in the Universe.”center_img © 2014 Phys.org. All rights reserved. More information: Liang Dai, et al. “Rotation of the Cosmic Microwave Background Polarization from Weak Gravitational Lensing.” PRL 112, 041303 (2014). DOI: 10.1103/PhysRevLett.112.041303 Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Pure optical detection of spikes for the ultimate brain machine interface

first_img More information: Subrata Batabyal et al, Label-free optical detection of action potential in mammalian neurons, Biomedical Optics Express (2017). DOI: 10.1364/BOE.8.003700AbstractWe describe an optical technique for label-free detection of the action potential in cultured mammalian neurons. Induced morphological changes due to action potential propagation in neurons are optically interrogated with a phase sensitive interferometric technique. Optical recordings composed of signal pulses mirror the electrical spike train activity of individual neurons in a network. The optical pulses are transient nanoscale oscillatory changes in the optical path length of varying peak magnitude and temporal width. Exogenous application of glutamate to cortical neuronal cultures produced coincident increase in the electrical and optical activity; both were blocked by application of a Na-channel blocker, Tetrodotoxin. The observed transient change in optical path length in a single optical pulse is primarily due to physical fluctuations of the neuronal cell membrane mediated by a yet unknown electromechanical transduction phenomenon. Our analysis suggests a traveling surface wave in the neuronal cell membrane is responsible for the measured optical signal pulses. (Phys.org)—Brain-machine interfaces (BMIs) are basically gimmicks. The reason you don’t hear so much about them these days is because, in the fullness of time, significant tangible benefit to a user has flat out failed to materialize. Simply stated, neither prickly microelectrode arrays, harrowing optogenetic reworks to our physiology, nor tattooing our brains with toxic fluorescents WILL ever give us what we need. On the other hand, if you can watch native spikes bubble unmolested through axon tracts from afar, sans any of the aforementioned hazards, you might be onto something. Explore further When spikes collide: Shaking the foundation of neuroscience © 2017 Phys.org Action potential. Credit: Wikipedia This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. While any serious brain researcher must be fully aware of these truths at some gut a level, any collective admission as such would require several basic underpinnings of the field to be jettisoned. For starters, this means letting go of the idea that spikes are fully described by the strictly electrical epiphenomena researchers amplify on their oscilloscopes. In other words, representing axons as equivalent circuits irreversibly dissipating their spike energy through various impedances falls short. Fortunately, a critical mass of researchers have now developed tools to probe the larger intrinsic physics of the spike. The goal is to develop a more general theory of excitability in cells which can explain all the observed physical changes (such as dimension, pressure and temperature). Their secret sauce, that which will eventually yield brain devices we covet, is label-free optical detection of mechanical spikes.Although there is a long history of work in this field, several recent papers suggest we are finally beginning to understand this physics. The first paper uses the tried and true method of fiber optical interferometry to detect the nanometer scale changes in optical path length that occur when cells spike. The second paper manages to extract 0.2 nm scale excursions in the cell envelope during spikes using image subtraction and denoising techniques. Finally, a third set reports on the huge micron-scale displacements in spiking Chara plant cells, and revisits the intriguing question of what happens when spikes traveling in opposite directions collide.Can we make practical BMIs with interferometers?For widespread practical BMIs to ever become a reality they are probably going to need to be small. Classic Michelson interferometers, the kind every physics major recreates at some point in a laboratory course, have not generally been associated with compactness or configurability. While suitable for things like disproving the aether or glimpsing gravitational waves using massive optical legs, Michelson interferometers aren’t always the first choice for biologic experiments. Instead, the Mach-Zehnder interferometer is often used because each of its well-separated light paths is only traversed once, making it much more versatile. Mach-Zehnder modulators can now be built as monolithic integrated circuits that have high-bandwidth electro-optic amplitude and phase responses over a multiple GHz frequency range. Despite the seeming advantages of the Mach Zehnder, author Digant Dave from the first paper said they use the Michelson interferometer for their experiments because the common path topology gives very high axial sensitivity. In particular, they can measure displacements of less than 0.1nm in an in vitro cell preparation. The probe beam spot size is ~4.5 μm and high SNR is achieved by sandwiching neurons between two pieces of glass. The recorded optical pulses ranged from 20 to 300 ms (mostly under 50ms), which is a bit longer than the 5 to 7 ms range for the spikes they recorded via patch clamping. I asked Dave how an an in vivo 2-D nerve scanning implementation of his in vitro setup might theoretically be made. He said that the fiber tips themselves could be as small as 1mm and be used in either of two modes: either raster scan the probe beam, or acquire 2-D images while scanning the input light source wavelength. At a millimeter in diameter each, I would think it should be possible to thread several such probes into the ventricular system of the brain in order to scan the vast axon tracts lining the walls of the 3rd and 4th ventricles. Just beneath the cerebellum are several natural vents which circulate CSF to equilibrate pressure. In particular, the Foramens of Magendi and Lushka would be ideally suited for the purpose.Pending further miniaturization, much of the hardware for signal processing and perhaps even optical beam prep may still have to be remain closely apposed or tethered outside the body. Of more immediate concern than hardware however, would be the effects of myelin on the signal. To date, most of the studies have been done using bare axons or plant cells that have been denuded of their cell wall. Myelin might absorb or otherwise attenuate mechanical and thermal pulses, or quite possibly it could have an amplifying effect on other variables like pressure. For example, when the Chara cells were ‘plasmalysed’, as reported in the third paper, to eliminate the cell wall and the associated turgor pressure afforded by it, the smaller 100nm scale displacements were converted to micron scale displacements.I asked Digant what he thought about the prospect of measuring displacements without interferometers as was reported in the second paper mentioned. While he noted that 0.2nm sensitivity was very impressive for a standard bright field scope, he observed that these measurements were made laterally in the cell envelope and required significant averaging of hundreds of frames. The authors were also able to simultaneously patch clamp the cells to compare amplitude and phase of the electrically recorded spike, however, this itself may complicate the mechanical measurements. As far as implementing this kind of recording as a BMI, I would think there would be many difficulties.One outstanding question regarding spikes is whether they have significant non-dissipative components. Amoing other things, this would seemingly bear significantly on how much energy they require and carry. Recent studies have attempted to determine exactlyhow much ATP different kinds of neurons need for spiking, however it seems many of their underlying assumptions are dubious. Digant reports that many of the optical pulses have dissipative components as indicated multiple cycles of decaying oscillation after stimulation. He plans to begins studies using optogenetic stimulation to eliminate any artifact introduced by patch clamp.One good way to get handle on what is going on in spiking cells is to observe what happens when pulses collide. In other words, do they annihilate due to relaxing ion channels like theory predicts, or can they pass through each other? Previous research has found that spikes are naturally propagated in opposite directions down axons, and furthermore that in some cases they can pass right through each other unaffected. Other work has also shown that the speed, amplitude and shape of the spike normally depends on which way it is going. The most recent studies reported here for collisions in Chara cells found that electrically recorded spikes mostly do annihilate upon collision. The authors suggest that from an acoustic point of view, annihilation can be a result of nonlinear material properties of the entire excitable medium. Because there have been some discrepancies between the phase and directions of cell expansion in different studies with respect to the time course of the electrical spike, optical recordings of collision would probably be informative. We should note that in axons, different protein and lipid compartments can carry different forms of excitation. For example, while ion channels are typically associated with the electrical spike, soliton-like wave phenomena can propagate in bare membranes. In the early days, the original Hodgkin-Huxley papers suggested that membrane dipoles themselves might be responsible for action potentials.Furthermore, the actin cytoskeleton can also propagate excitation (although pulses generally for longer times as in muscle contraction), and also the tubulin cytoskeleton seems to support excitation and oscillation. As mentioned, the myelin likely also contributes, possibly even through other physical processes like propagating phase changes in lipid components. One thing we might keep in mind for in vivo measurements (particularly for bundled nerves) is that different fascicles may form their own optical sandwich which can be used for the reference optical path length as done for Digand’s in vitro work.A most neglected, but perhaps most important source of excitation in cells or axons may be the mitochondria. In heart cells, for example, the so-called ‘mitoflash’ response, coordinated by up to 8000 mitochondria per cell, precisely maintains the ATP ‘setpoint’ across a workload that changes by tenfold. This mitoflash excitation is itself composed of several different components; so-called ‘redox sparks’, calcium, NADPH, protons, and other molecules have all been recorded, not to mention recent studies showing the interiors of actively respiring mitochondrialcan exceed 50 degrees C. Although controversial, superoxide anion, sometimes associated with direct control of aging and lifespan, has also been presumed to be detected by different mitoflash probes. Because mitochondria are concentrated at axon internodes it is quite possible that they make significant contribution the the saltatory conduction of spikes in myelinated axons. Considering that the membrane potential in mitochondria is at least double that of the cell itself, and it comes in many small and mobile packages per neuron, this may not be too surprising. Excitability of the whole cell would then be controlled by the dispersion or aggregation of mitochondria into various formations, perhaps akin to how skin color is controlled by strategic mobilization of melanosomes. More locally, mitoflash has been shown to control size and morphology in dendritic spines, leading to wanton speculation regarding memory. For the BMIs many desire to someday be practical, not only a theory of spikes will be essential, but I’d suggest also the ability to detect, create, or destroy them by the same physical processes that naturally support them. Journal information: Biomedical Optics Express Citation: Pure optical detection of spikes for the ultimate brain machine interface (2017, August 15) retrieved 18 August 2019 from https://phys.org/news/2017-08-pure-optical-spikes-ultimate-brain.htmllast_img read more

Study suggests initial success in prestigious institutions key to lifelong artistic achievement

first_img © 2018 Science X Network Citation: Study suggests initial success in prestigious institutions key to lifelong artistic achievement (2018, November 9) retrieved 18 August 2019 from https://phys.org/news/2018-11-success-prestigious-key-lifelong-artistic.html Hot streak: Finding patterns in creative career breakthroughs Co-exhibition network, whose nodes are art institutions (galleries, museums). Node size is proportional to each institution’s prestige. Nodes are connected if they both exhibited the same artist. Credit: Samuel P. Fraiberger, Alice Grishchenko, Albert-László Barabási The researchers found that initial success with prestigious institutions offered a major boost to an artistic career. Those artists who managed to arrange several showings within the prestigious network at the beginning of their careers were far more likely to continue exhibiting later in life. In sharp contrast, those who failed to find a footing in the prestigious network during their initial showings tended to have much less prestigious careers—and many more of them dropped out of the scene altogether.The researchers suggest it might be time for the art world to set up a blind lottery system when choosing which pieces to exhibit, forcing participants to judge work on merit alone. Explore further Co-exhibition network, whose nodes are art institutions (galleries, museums). Node size is proportional to each institution’s prestige. Nodes are connected if they both exhibited the same artist. Credit: Samuel P. Fraiberger, Alice Grishchenko, Albert-László Barabási Journal information: Science Judging the value of a piece of art is tricky, as the researchers note. They highlight the difficulty by pointing out that a painting called “The Man with the Golden Helmet” by Rembrandt was once the pride of Berlin—until experts discovered that it was not actually painted by Rembrandt. Suddenly, it lost most of its value, even though the painting had not changed. The reason: history and context. For many, the value of art is more than just the value of a single piece—it is about a body of work by individuals believed to have talent. And it might also have a little to do with luck and access. In this new effort, the researchers looked at the careers of 31,794 artists who were good enough to have had at least 10 exhibitions of their work during the years from 1950 to 1990, and compared how they fared against each other.The researchers had an inkling that access to prestigious institutions like New York’s Museum of Modern Art or the Guggenheim might have an impact on an artist’s career. To see if this might be the case, they looked at the success rates of artists (using the app Magnus) who managed to score exhibitions within the exclusive network of prestigious institutions and the impact it had on their careers. An international team of researchers has found that early exposure by certain art institutions is a major factor in lifelong success as an artist. In their paper published in the journal Science, the group describes their study of artistic careers over a 40-year span and the major factors that contributed to success and failures. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Experts disagree with prior study that claimed sheep have facerecognition abilities comparable

first_img © 2019 Science X Network Sheep are able to recognize human faces from photographs More information: Are face recognition abilities in humans and sheep really ‘comparable’? Royal Society Open Science (2019). royalsocietypublishing.org/doi/10.1098/rsos.180772 A team of facial recognition experts from the University of New South Wales, Newcastle University and the University of York has published a Comment piece in the journal Royal Society Open Science challenging claims made by another research team. In their paper, they acknowledge that the findings of a team last year regarding the facial recognition abilities of sheep was compelling, but they take issue with the claim that the research showed that sheep have facial recognition abilities comparable to humans. Humans have very strong facial recognition skills conferring the ability to pick out the faces of friends in a crowd with no problem, for example. Thus, it came as quite a surprise when a team of researchers in 2017 claimed in a published paper that sheep have facial recognition skills that were comparable to humans. In their rebuttal, the authors suggest that the evidence reported by the researchers was insufficient to make such a claim and outline the reasons.The authors note that the sheep in the study learned to recognize just four faces—all celebrities. The sheep were shown different pictures of the celebrities over the course of three training sessions. Afterward, they were shown a picture of one of the celebrities and chose which of another set was the same person. The sheep were able to pick the right one on average 79 percent of the time when shown identical pictures of the celebrity, and 66 percent of the time when shown a different picture. The authors acknowledge the numbers showed that the sheep were recognizing the people in the images, not just the image. But they also point out that claiming such a finding proves skills comparable to humans is not logical. They note that similar experiments with humans involve the recall of many more faces—human subjects also get only one training session, whereas the sheep got three. Additionally, in human studies, volunteers are generally shown pictures sequentially and decide if they have seen a given face rather than pairs of pictures. They also note that in the study, the sheep recognized the faces of their handlers with far less accuracy than has been found in studies of the human ability to recognize familiar faces. They conclude by suggesting that before a claim of comparable abilities can be made, tests must be the same for both species. Explore furthercenter_img Citation: Experts disagree with prior study that claimed sheep have face-recognition abilities comparable to humans (2019, January 23) retrieved 18 August 2019 from https://phys.org/news/2019-01-experts-prior-sheep-face-recognition-abilities.html Credit: CC0 Public Domain Journal information: Royal Society Open Science This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

FTIL scrip up by over 45

first_imgShares of Financial Technologies India (FTIL) ended over 4.5 per cent higher after the company inked a pact with ace investor Rakesh Jhunjhunwala and others to sell its entire 5 per cent stake in MCX-SX for Rs 88.41 crore.After gaining 7.54 per cent to Rs 194.50 in intra-day trade, shares of FTIL ended at Rs 189.05, up 4.53 per cent from its previous close on the BSE. In terms of volume, 3.18 lakh shares of the company changed hands at the BSE, while over 8 lakh shares were traded at the NSE during the day. FTIL has been in trouble ever since the Rs 5,600 crore payment scam surfaced at group firm NSEL. The group has started exiting from the exchange business both in India and abroad after commodity markets regulator FMC order declared FTIL and its founder Jignesh Shah as unfit to run any exchange in view of this scam.last_img read more

North East Magic

first_imgThe first ever Northeast festival Songs and Dances of Northeast  hosted by North Eastern Council and Government of Meghalaya  at Indira Gandhi Indoor Stadium will be inaugurated by President Pranab Mukherjee on April 11.This is a major initiative by the Government of Meghalaya and the North Eastern Council to create a platform for organising the event in the Capital.  Mukul Sangma, Chief Minister of Meghalaya along with other senior officials of North Eastern Council will grace the occasion by their presence. Also Read – ‘Playing Jojo was emotionally exhausting’The festival will help to enhance the multi-ethnic character of the country’s capital and dispel impressions that it was hostile to outsiders, particularly people from the Northeast. “The event is conceptualised and designed to bind together the diverse culture and heritage of the North East on a common platform and connect with rest of India. North East is known for its diverse music, richness of cultures, colours’ of traditions and the sweet melodies of folklores” said M War Nongbri- Director Art and Culture (Government of Meghalaya).  Also Read – Leslie doing new comedy special with NetflixThe festival shall represent The Octave – Assam, Meghalaya, Mizoram, Tripura, Arunachal Prasesh, Sikkim, Nagaland and Manipur. The festival showcases the rich, cultural ethnicity and diversity of Northeast India. This festival takes Northeast and its heritage outside the Northeast for the first time in such a big and multidimensional way to capital of India and in a sense to the rest of the country and the world. It is a day-long festival where visitors experience almost everything from the Northeast – from food, songs, dances, culture, and much more. It is the perfect time for people from all walks of life to get a glimpse of the rich cultural heritage of the region. Witness the grandness of the Octave as they set up their stalls and display a plethora of the finest products from the Northeast for the world to discover.  This shall also be an opportunity to savor North-eastern cuisine with a wide variety of mouth-watering delicacies.  Music lovers and culture connoisseurs will have a splendid time attending this festival as performances by Northeast bands will be a major attraction of the festival. Leading Bands of North East like Imphal Talkies, Minute of Decay, Silman Marak, Mizoram folk Artist, Girish and the Chronicles will be performing at the festival.  This festival showcases the celebration of the way of life of the people there with a great sense of mysticism and cultural euphoria. All of these unlimited and unforgettable experiences and much more comes for free. When: On April 11 Where: Indira Gandhi Indoor Stadiumlast_img read more

Jaipuria students try to tamper with attendance register authorities file police complaint

first_imgKolkata: The authorities of Jaipuria College on Tuesday lodged a written complaint with the Shyampukur police station against some students who had allegedly forced into the room of the teacher-in-charge on Saturday created nuisance and tried to tamper with the attendance register. These students were short of attendance to sit for the semester examination.The college authorities, along with the principal, held a meeting on Tuesday and scanned the CCTV footage to identify the students involved in creating disturbance in the college. Also Read – Rain batters Kolkata, cripples normal life”There was some confusion in the room of the teacher-in-charge on Saturday. Though there was no loss of any document but the attendance register was found elsewhere,” principal Ashok Mukherjee said. However, Mukherjee did not give any explanation as to what actually took place that led the college authorities to lodge a complaint. According to sources in the college, some students had entered the room of the teacher-in-charge and one of the girl students put the attendance register in her bag. The footage has been captured. It may be mentioned that there were around 60 students who were short of attendance and their percentage of attendance was around 45 percent. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedA senior professor in the college said that with the implementation of the Choice Based Credit System (CBCS), the university has become extremely stringent about attendance and that there was no other alternative but to abide by the rules of the varsity. It may be mentioned that Jaipuria College was in the news in July this year after police arrested a former student of the college for allegedly demanding money from students to ensure admission.last_img read more

Govt to upgrade Jadavpur Stadium

first_imgKolkata: The state government will upgrade the Kishore Bharati Krinangan popularly known as Jadavpur Stadium, located in Santoshpur, to international standards.The decision has been taken following the highly successful hosting of FIFA Under-17 World Cup in October 2017 at Vivekananda Yuba Bharati Stadium, popularly known as Salt Lake Stadium. “We feel that Kolkata is capable of hosting big sporting events if we have more stadiums of international standards,” a senior official of the state Youth Services and Sports department said. Also Read – Rain batters Kolkata, cripples normal lifeSources in the department said that the parts of the stadium complex to be renovated are the field, ten galleries and drainage system. The floodlight system will be completely overhauled as well. An air-conditioned dressing room with all modern facilities, Press box and several other parts would be newly built. The renovation of the galleries alone will cost around Rs 3 crore. The State Public Works Department (PWD) will be overseeing the project and tenders have already been called by the department. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedAn official in the Sports department said that the Kanchenjunga Stadium in Siliguri is also being upgraded to international standards, while the Barasat Stadium is being renovated. The Trinamool Congress Government, over the last seven years, has built 45 stadiums of various sizes. The Sports department is also providing funds to civic bodies to renovate different sports facilities under their jurisdiction. It may be mentioned that the state government is trying its best to inculcate a sporting culture across Bengal. Various sports tournaments are being organised across the state that include Jangalmahal Cup, Himal-Terai-Dooars Sports Festival and Sunderban Cup, where lakhs of youths take part. Besides being given medals and other prizes, several of the successful athletes are also being provided employment as civic volunteers and home guards.last_img read more