This 125 nm x 85 nm rectangular DNA origami (“A”) contains Rickettsia polymerization motors growing from closed-circle sites. Credit: Venkataraman, et al. ©2007 Nature. Citation: Molecules autonomously propelled by polymerizing DNA strands (2007, September 6) retrieved 18 August 2019 from https://phys.org/news/2007-09-molecules-autonomously-propelled-polymerizing-dna.html Representing the Departments of Bioengineering, Computer Science, Computation & Neural Systems, and Applied & Computational Mathematics at Caltech, researchers Suvir Venkataraman and colleagues have published their results in a recent issue of Nature Nanotechnology. In contrast to previous synthetic molecular motors, the current motor is powered by non-covalent interactions and operates freely in solution without a substrate.“Propulsive locomotion is achieved by harnessing a hybridization chain reaction (HCR), in which metastable DNA hairpins polymerize upon encountering a target molecule,” coauthor Niles Pierce told PhysOrg.com. “Strikingly, the propelled DNA strand remains firmly in contact with the growing polymer while performing successive handshakes with inserting hairpins.”In geometric mimicry of Rickettsia’s comet tail, the researchers used atomic force microscopy to demonstrate patterned polymerization on one side of a rectangular DNA origami (a method of constructing nanoscale objects recently invented by coauthor Paul Rothemund). The researchers do not yet know whether the polymerization of nanoscale nucleic acid monomers can propel microscale objects freely through solution in more complete functional mimicry of Rickettsia. “This study provides a proof of principle that DNA hybridization can be used to power autonomous molecular locomotion,” said Pierce. “Researchers at the NSF Center for Molecular Cybernetics, of which our team is a part, are now working to develop logical walkers that can work cooperatively and respond to their environment. It is possible that synthetic molecular motors may one day be routinely used in medicine, basic research, and manufacturing.” Citation: Venkataraman, Suvir, Dirks, Robert M., Rothemund, Paul W. K., Winfree, Erik, and Pierce, Niles A. “An autonomous polymerization motor powered by DNA hybridization.” Nature Nanotechnology, Vol, 2, August 2007, 490-494.Copyright 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 This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Scientists from the California Institute of Technology have fabricated a motor that runs autonomously, and is powered only by the free energy of DNA hybridization. The molecular motor was inspired by bacterial pathogens such as Rickettsia rickettsii that propel themselves through host cells by polymerizing protein “comet tails.” The synthetic mimic operates by polymerizing a double-helical DNA tail out of metastable DNA hairpins (a pattern named for its 180-degree turn). Explore further Are the ‘viral’ agents of MS, ALS and schizophrenia buried in our genome? 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.
Citation: Calculating art: Meet e-David, the painting machine (w/ Video) (2013, July 15) retrieved 18 August 2019 from https://phys.org/news/2013-07-art-e-david-machine-video.html The school’s Department of Computer and Information Science has a structure where workgroups share a common research topic, and e-David is a project within the topic, “Exploration and visualization of large information spaces.” The robot is not “person-able,” more like the metallic skeleton of a mythical and very studious canine. They used an industry robot normally used to weld car bodies, and enhanced it with sensors, camera, control computer, and art supplies. They chose the name “David” not because they especially liked that name but because it stands for what they tried to accomplish: Drawing Apparatus for Vivid Image Display.The computer program provides drawing commands that are executed by the machine. This can be considered as a step above humans painting- by-numbers: Just as one observes sidewalk artists repeatedly tweaking their lines and dabs and brush strokes as they fill an empty canvas, the robot does something similar. The device takes a picture of what it wants to copy. The robot watches itself paint and decides where to add the next stroke, constantly tweaking its moves based on what it’s seeing through a camera pointed at its canvas. “We establish a control loop using the camera in which the output of the robot is captured and new drawing commands are computed that correct the errors of the preceding step.” As for art supplies, the team provides a generous outlay of five different brushes and 24 colors. The machine’s output raises the question of whether a machine can actually achieve works of artistic merit. Isn’t a good painting or line drawing by a human artist more than just a set of rules? How far are we going in expecting a system capable of “algorithms for spatial division” and “color and content composition” to result in comparable works of art?Continued exploration with e-David could provide some interesting insights. “Our hypothesis is that painting – at least the technical part of painting – can be seen as optimization processes in which color is manually distributed on a canvas until the painter is able to recognize the content.” They said that e-David “will enable us to enclose the whole process of drawing production into an optimization framework. This will allow us to investigate human optimization schemes and to find out to what extent such schemes can be formulated using algorithms.”It need not be a question of a future Picasso versus an e-David but rather an advantageous collaboration of artist with machine, one where the machine enables new techniques for artists. Repentir app: Exploring art at a stroke Credit: e-David project Explore further More information: www.informatik.uni-konstanz.de/en/edavid/ © 2013 Phys.org (Phys.org) —Sometime in the future, you will be at an art gallery where you are drawn to a nice-looking tree, or haunting line drawing of a woman’s face, or historical portrait, and you will wonder who is the artist. Eye the lower corner of the canvas and it will tell you, “David.” What you might not realize is that David is a robot—e-David, to be exact. A team at the University of Konstanz in Germany have developed e-David as a robot “artist” that uses software to decide where to add the next brush stroke. After each brush stroke, e-David takes a picture, and its software calculates such moves as where the image needs to be lightened or darkened. At the University of Konstanz, the group said their project objective is to build a robot that can paint, pure and simple. By paint, they do not mean adding a fresh coat to a kitchen ceiling but delivering art. 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 further (Phys.org) —A team of researchers working in China has determined that previously found bird fossils show that Jeholornis, which lived in what is now China approximately 120 million years ago, had two tails. In their paper published in Proceedings of the National Academy of Sciences, the researchers describe their study of the fossils and the dual tails—one long with feathers near the end, the other short and more useful for flying. Reconstruction of the plumage of Jeholornis. (Scale bar: 5 cm.) Credit: PNAS, Published online before print October 7, 2013, doi: 10.1073/pnas.1316979110 Journal information: Proceedings of the National Academy of Sciences Citation: New analysis of fossils reveal ancient bird had two tails (2013, October 8) retrieved 18 August 2019 from https://phys.org/news/2013-10-analysis-fossils-reveal-ancient-bird.html © 2013 Phys.org The fossil specimens under study were part of a large group of fossils found in a part of China known as Jehol—most of which were of different types of birds. Jeholornis was previously thought to have just one long ornamental tail. This new research indicates that another was present also, situated much closer to the spine and very likely useful as an aid in flight.Prior efforts had led to finding 11 fossil specimens that had been identified as Jeholornis—four of them had feather and bone remains that showed the bird had a long tail with just a few feathers near the tip and also another tail that was much more like those of modern birds—a frond useful for steering while in flight. The team noted that some of the other fossils did not appear to have both tails, suggesting that one of tails, likely the long ornamental one, existed in just one gender—a common occurrence in modern birds. Its purpose, like the large plumes on some modern birds such as peacocks, likely was for attracting a mate.Scientists believe that Jeholornis likely belonged to a class of birds that never made it to the modern era, dying off millions of years ago. They note also that the bird had other notable characteristics as well—they had claws on their wing joints, out in front, and at least three teeth. Both traits are obviously very unusual, though clearly neither offered enough of an advantage to allow the bird to survive.The team plans to continue studying the fossil remains, most particularly the aerodynamic properties of the tails to see if both worked to aid in flight, if one was truly ornamental, or if either was used in ways that have not been seen before. More information: Unique caudal plumage of Jeholornis and complex tail evolution in early birds, PNAS, Published online before print October 7, 2013, DOI: 10.1073/pnas.1316979110AbstractThe Early Cretaceous bird Jeholornis was previously only known to have a distally restricted ornamental frond of tail feathers. We describe a previously unrecognized fan-shaped tract of feathers situated dorsal to the proximal caudal vertebrae. The position and morphology of these feathers is reminiscent of the specialized upper tail coverts observed in males of some sexually dimorphic neornithines. As in the neornithine tail, the unique “two-tail” plumage in Jeholornis probably evolved as the result of complex interactions between natural and sexual selective pressures and served both aerodynamic and ornamental functions. We suggest that the proximal fan would have helped to streamline the body and reduce drag whereas the distal frond was primarily ornamental. Jeholornis reveals that tail evolution was complex and not a simple progression from frond to fan. Best evidence yet that dinosaurs used feathers for courtship 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.
Sexually naive male mice, fathers respond differently to pups A team of researchers working at Harvard University has found that a certain type of neuron in a certain part of the mouse brain is responsible for governing parental behavior. In their paper published in the journal Nature, the team describes several experiments they conducted with mice and the results they observed. Ivan Rodriguez offers a follow-up to the research in a News & Views piece in the same journal issue. Journal information: Nature Credit: Martha Sexton/public domain Explore further Scientists know that for most animals, males and females behave differently regarding parental care of offspring. With mice, for example, virgin males will attempt to kill any pups they encounter, while females attempt to protect and nurse them. Prior research has shown that male mice cease attacking pups if they have had sex with a female starting approximately about the time that the female gives birth. That behavior only lasts for awhile, however, as approximately 50 days after birth (after they pups have grown up) the males revert to aggression towards pups. In this new effort, the researchers sought to understand the mechanism behind this switch in the mice. Their efforts came in two stages, the first was in experimenting with the vormero-nasal organ in the mouse nose, the second involved studying the parts of the brain that were impacted by the release of chemicals from the vormeor-nasal organ.Prior research had shown that the vormero-nasal organ in mice was involved in certain behaviors—chemicals released from it for example, drive behavior when two adult males encounter one another. The researchers conducted several experiments involving disabling the organ in male mice and found that doing so caused them to behave less aggressively towards pups they encountered. The researchers followed that up by noting that certain parts of the hippocampus lit up when adults were demonstrating parental care. That suggested a chemical from the vormero-nasal organ was causing changes to neural response in the brain. The team then ran several more experiments where they disabled the neurons they had seen become active during parental care, and found that doing so allowed them to control parental care in the mice—in one experiment they even used optogenetics to allow for switching the behavior on and off using a light. Looking closer, the team found that the neurons involved produced a protein called galanin when parents of either gender were behaving in a caring manner—when forced in males, the males tended to pups in motherly ways.The research is still too new to apply what has been learned to humans, but logic suggests that some similar processes are likely occurring, which might help explain some human parental behavior patterns. © 2014 Phys.org More information: Galanin neurons in the medial preoptic area govern parental behaviour, Nature 509, 325–330 (15 May 2014) DOI: 10.1038/nature13307AbstractMice display robust, stereotyped behaviours towards pups: virgin males typically attack pups, whereas virgin females and sexually experienced males and females display parental care. Here we show that virgin males genetically impaired in vomeronasal sensing do not attack pups and are parental. Furthermore, we uncover a subset of galanin-expressing neurons in the medial preoptic area (MPOA) that are specifically activated during male and female parenting, and a different subpopulation that is activated during mating. Genetic ablation of MPOA galanin neurons results in marked impairment of parental responses in males and females and affects male mating. Optogenetic activation of these neurons in virgin males suppresses inter-male and pup-directed aggression and induces pup grooming. Thus, MPOA galanin neurons emerge as an essential regulatory node of male and female parenting behaviour and other social responses. These results provide an entry point to a circuit-level dissection of parental behaviour and its modulation by social experience.See: Researchers identify neurons that regulate parental behavior in both male and female mice Citation: Researchers find chemicals and neurons responsible for turning parental care on and off in mice (2014, May 15) retrieved 18 August 2019 from https://phys.org/news/2014-05-chemicals-neurons-responsible-parental-mice.html 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.
High-sensitivity, high resolution magnetocardiography for use at room temperature More information: A Magnetic Wormhole, Scientific Reports 5, Article number: 12488 (2015) DOI: 10.1038/srep12488AbstractWormholes are fascinating cosmological objects that can connect two distant regions of the universe. Because of their intriguing nature, constructing a wormhole in a lab seems a formidable task. A theoretical proposal by Greenleaf et al. presented a strategy to build a wormhole for electromagnetic waves. Based on metamaterials, it could allow electromagnetic wave propagation between two points in space through an invisible tunnel. However, an actual realization has not been possible until now. Here we construct and experimentally demonstrate a magnetostatic wormhole. Using magnetic metamaterials and metasurfaces, our wormhole transfers the magnetic field from one point in space to another through a path that is magnetically undetectable. We experimentally show that the magnetic field from a source at one end of the wormhole appears at the other end as an isolated magnetic monopolar field, creating the illusion of a magnetic field propagating through a tunnel outside the 3D space. Practical applications of the results can be envisaged, including medical techniques based on magnetism. Journal information: Scientific Reports (a) The field of a magnetic source (right) is appearing as an isolated magnetic monopole when passing through the magnetostatic wormhole; the whole spherical device is magnetically undetectable. (b) The wormhole is composed of (from left to right) an outer spherical ferromagnetic metasurface, a spherical superconducting layer, and an inner spirally wound ferromagnetic sheet. Credit: Scientific Reports 5, Article number: 12488 (2015) doi:10.1038/srep12488 Explore further People have grown familiar with the term wormhole as it applies to physics and science-fiction. It has been described as a portal in space-time, where an object, or perhaps a person, could be transported from one region of space to another, nearly instantaneously. And while the theory has stood the test of time, no one has ever been able to prove that they actually exist. In this new effort, the researchers built a much simpler version, one that applies only to a magnetic field. Their device essentially allows for a magnetic field to be conveyed from one point to another, while remaining magnetically invisible.The device is a three layered sphere—at its center they placed a magnetized metal tube. The tube was then surrounded by a sphere made of strips of a superconducting material (yttrium barium copper oxide)—it served to deflect incoming fields. Another sphere was then placed over the whole works to make the deflection of the inner sphere undetectable. To make the device work as intended it was put into a liquid nitrogen bath to bring the temperature inside the sphere down to the point where the yttrium barium copper oxide behaved as a superconductor. The end result was a device that made it appear that a magnetic field suddenly disappeared, then reappeared at another place.The team tested their device by placing it in an external magnetic field that that they created and then placed magnetic probes at either end of the sphere. The first probe indicated the presence of a monopole-like field. The second probe was moved back and forth across the length of the sphere and indicated no magnetic field was present—temporarily removing either shell revealed that there was indeed a field inside the sphere.Beyond its research value, the team believes that their device could serve as the basis for a new type of MRI machine, one that could relieve patients from having to sit inside of a big loud shell while their insides are examined. 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. Citation: Trio create artificial magnetic wormhole (2015, August 21) retrieved 18 August 2019 from https://phys.org/news/2015-08-trio-artificial-magnetic-wormhole.html © 2015 Phys.org (Phys.org)—A trio of physicists with the Autonomous University of Barcelona has built what they claim is the first artificial magnetic wormhole. In their paper published in the journal Scientific Reports, Jordi Prat-Camps, Carles Navau and Alvaro Sanchez describe how they built the device and why they believe it might prove useful in building a more user-friendly MRI machine.
The researchers begin by noting that in addition to deniers (who they suggest are typically out for political gain) there are now people they describe as neoskeptics—people who believe that using money to combat the problem of rising global temperatures due to human greenhouse gas emissions is a waste, in large part because scientists cannot prove one way or another what might happen. They suggest this new way people have of dealing with climate change needs to be addressed by the scientific community because it represents a new threat to undoing the movement to curb emissions.The authors suggest that the crux of such arguments boils down to differences of opinion regarding a tipping point, and indeed if there even is one. But they note such arguments ignore the enormity of acting as if there is no reason to worry, pointing out that the longer we wait to curtail emissions the higher the risk of extreme negative environmental impacts. They suggest that the scientific community needs to start working under previously encountered uncertainty situations, such as when chemicals like DDT were outlawed. They further suggest that the way to prevent neoskepticism from creeping into the national debate is for the scientific community to find better ways to frame the debate. Instead of offering doom and gloom scenarios, they propose, why not offer ideas in ways that are familiar to people, such as comparing the risk of continuing on in our dangerous ways with people buying life insurance.The authors conclude by acknowledging that offering better models to the public to help combat efforts by those arguing against making efforts to combat climate change likely will not end skepticism, but they believe it just might help those in position to make decisions, make better ones. A small panel of researchers has addressed what they suggest is a new threat to combating climate change—neoskepticism—where people believe climate change is real, but do not believe there is anything that can be done about it, by penning a letter addressing adherents in a Policy Forum piece in the journal Science. The essayists, Paul Stern with the National Research Council, John Perkins with The Evergreen State College, Richard Sparks with the University of Illinois and Robert Knox with the University of California outline the ideas behind neoskepticism, explain why they think it is dangerous and then offer some ideas on how to address related issues or concerns. Journal information: Science 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. More information: P. C. Stern et al, The challenge of climate-change neoskepticism, Science (2016). DOI: 10.1126/science.aaf6675 Citation: Panel offers advice on how to combat climate-change “neoskepticism” (2016, August 12) retrieved 18 August 2019 from https://phys.org/news/2016-08-panel-advice-combat-neoskepticism-climate.html As global temperatures rise, children must be central climate change debates © 2016 Phys.org Credit: public domain
More information: Stephanie A. Henson et al. Rapid emergence of climate change in environmental drivers of marine ecosystems, Nature Communications (2017). DOI: 10.1038/ncomms14682 An international team of researchers has developed a computer model that makes predictions regarding four major stressors to the world’s oceans over the next several decades. In their paper published in the journal Nature Communications, the team describes the factors that went into the model and how it can be tuned to make predictions based on estimates of greenhouse gas emissions over the coming years. Most people know that if the planet heats up, so, too, will the world’s oceans. Scientists have been conducting experiments designed to understand what that might mean for sea life—but as the researchers with this new effort note, to date, not much work has been done to unite current findings regarding stressors (changes to marine conditions) to predict when certain changes might come about, or if there might be some overlap.To create their model, the researchers added information about four main stressors: pH level (more CO2 makes the water more acidic), primary production (availability of food), and water temperature and oxygen levels in the water. Then, they ran 12 climate models to give their own model more information regarding where each of the stressor types was likely to have an impact and when. The model predicted that within just 15 years more than half of the world’s oceans will be reacting to more than one of the four stressors—by 2050, that number will jump to 86 percent. These estimates were based on the status quo, meaning emissions levels remain at current levels. If the countries that signed the Paris agreement come through with their pledges, however, the model showed that could put off the changes due to stressors by approximately 20 years. It also showed that changes in pH levels are likely to have the earliest impact—indeed virtually all of the oceans have already been impacted. They note that particular stressors and their degree of impact will almost certainly vary between geographical areas and types of marine life in that area. They also note that their model is not capable of detailing a timeline for overlap between the stressors—they point out a current example in which both oxygen and pH levels move lower in one part of the ocean, causing corals and crustaceans to become more sensitive to changes in water temperature. The model is not able to predict which sorts of adaptions marine life might make, or which are likely to survive under different scenarios. Citation: Computer models show possible impact to world’s oceans of four major stressors due to climate change (2017, March 8) retrieved 18 August 2019 from https://phys.org/news/2017-03-impact-world-oceans-major-stressors.html 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. Credit: public domain Journal information: Nature Communications © 2017 Phys.org Environmental stress enhances the effects of pollutants Explore further
Play 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. Who wants such a thing? Given today’s collaborative nature of office work, Mehrotra had in mind diverse teams in companies. After all, he blogged, “the way we use documents has completely shifted. We aren’t trying to digitize physical analogs any more; we’re using documents as tools to run our teams.”Casey Newton in The Verge: “Open it for the first time and you’ll see a blank canvas that will be familiar to anyone who has ever used Google Docs or Microsoft Word. But drop in a table, add a few rows and columns, and you’ll find a powerful engine underneath.”Other services can be integrated in the spreadsheets. “Enter ‘GoogleDirections’ into a formula, for example, and Coda will insert a Google Map with directions from an origin location to a destination,” Newton said.One of their early users referred to it as “Minecraft for docs.” Perfect,” said Mehrotra.He wrote about what happened with other users:”As usage grew, Coda docs started taking on lives of their own. Our recruiter Raechel made an elaborate wedding planning doc. A hundred-person team uses Coda for one of its biggest projects. And my eldest daughter just onboarded her Lego robot league team in hopes of winning another championship this season.”What’s next? “We don’t even know everything this doc can do. Help us figure out its potential.” Coda is offering a fill-in bar where you enter your email to request an invite.Matthew Lynley, TechCrunch: “Time will tell whether or not Coda proves out to be as flexible, or more, to satisfy the needs for a wide array of teams that all have different demands.” If “ugh” is your favorite word to describe entering, amending and correcting data on the rows and columns on spreadsheets you are not alone. Coda, a new name in the document business, feels it’s time for a change. This is what they have to say, or rather, exclaim: Credit: CC0 Public Domain Citation: When words, structured data are placed on single canvas (2017, October 22) retrieved 18 August 2019 from https://phys.org/news/2017-10-words-canvas.html PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Attorneys say CODA bankruptcy issues resolved “Documents haven’t changed in 40 years. The first spreadsheet was built for accountants in the 70s. Since then, we’ve updated the interface and piled on features. But it’s still just cells in a spreadsheet.”They are offering a refreshing alternative to the accountant’s grid to list and watch over activities in the workplace.Their next-generation spreadsheet is in the wings. Its makers are confident there are people out there who will be happy to get hold of a tool with a more modern “language” for management.Shishir Mehrotra used to work in YouTube as head of product, said The Verge, and he wondered what would documents and spreadsheets look like if they were invented today? Together with another Alex DeNeui, he co-founded Coda.They have announced they built Coda and now are inviting others to see what it can do for them and their teams. What is it? The co-founders call it nothing less than “a new day for docs.” Primarily, it combines your words and data and parks them in one place; no more cross opening between spreadsheets and text docs. As Mehrotra said in a blog, it combines “the flexibility of writing words on a page with rich, structured data formed on tables.”Call it a tool or consider it a single new canvas. Coda “makes a collaborative document editor that combines a word processor and a spreadsheet,” said Casey Newton in The Verge. Explore further © 2017 Tech Xplore
Kolkata: The Special Task Force (STF) of Kolkata Police will interrogate four persons, who were arrested from Kasimbazar area in Bihar on Sunday, with a huge cache of firearms.A preliminary investigation revealed that the four persons were arrested on their way back from Kolkata with the “partly finished” firearms.Sources said a team comprising senior officers of the STF of Kolkata Police will visit Bihar to interrogate the arrested persons. They were carrying around 40 partly finished pistols in bags containing vegetables. Acting of a tip off, a team of Bihar Police raided and arrested them, following a search operation when they got down from a bus at Kasimbazar. Also Read – Heavy rain hits traffic, flightsInvestigation revealed that they were taking the firearms to Munger, where the remaining work had to be carried out to give a complete shape to the pistols. The pistols were bought at a price ranging between Rs 2,000 and Rs 2,500 and after completion, the same would get sold between Rs 4000 to Rs 6000. After getting information that four of them – Md Irfan, Md Imtiaz, Md Mukhtrar and Md Nasim – were returning from Kolkata with the “unfinished firearms”, the STF officers decided to interrogate them, because a few days ago, Kolkata Police made a similar major breakthrough by arresting members of a racket, who stole “scarp firearms” from the Rifle Factory Ishapore in North 24-Parganas. The same used to get smuggled to the Maoists and insurgency groups in the North East. All the four persons, who were arrested on Sunday at Kasimbazar, are residents of Bihar. Kolkata Police have so far arrested eight persons including four persons from Bihar in connection with the Rifle Factory Ishapore case. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedSo, now the STF of Kolkata Police would interrogate them on how and from where did they procure the “unfinished pistols”, along with questions on whether they have any connection with those arrested over the rifle factory case.Sources said, at the same time, police here will also be questioning those arrested over rifle factory case regarding the four persons, who were caught on Sunday, and whether they were known to them.It may be mentioned that in the case of the rifle factory arms smuggling, too, the arrested persons used to take scrap firearms to Bihar, where the same used to get repaired. The decision to interrogate them was taken as similarities were found in the modus operandi of both the cases.
A refreshing inter-museum collaboration of National Museum and Indra Gandhi Rashtriya Manav Sangrahalaya (IGRMS), focussing on the fascinating heritage of North-Eastern region, brought a 21-foot-long wooden sculpture of a dragon-like