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Month: August 2019

Your cell phone may be used against you in a court of

center_img Those are the allegations made by the American Civil Liberties Union against the Michigan State Police. They claim that they have been using technology to clone your cell phone data and use it against drivers for issues as trivial as a traffic stop. That data could include your photos, videos, e-mails, and GPS locations.The Michigan State Police have been accused of taking cell phones from people at traffic stops and cloning those phones. The devices used, called the CelleBrite UFED, were initially designed for forensic use, and now they may be being used in the field by patrol officers. These devices are capable of cloning the data that is stored on more than 3000 different models of cell phones. Security protections, including pins are not stopped by this device. It is even capable of accessing data that have been deleted on the phone, data that is no longer available to the phones owner.Requests by the ACLU to see log data from the Michigan State Police was met for a demand for half a million dollars to pay for the costs of retrieving the information. The ACLU replied to that request with a public letter that made reference to the constitutional rights of citizens and the possibility of litigation Currently, no other steps have been taken. Citation: Your cell phone may be used against you in a court of law (2011, April 21) retrieved 18 August 2019 from https://phys.org/news/2011-04-cell-court-law.html CelleBrite UFEDlast_img read more

Where no lab has gone before SingleMolecule Electrokinetic Traps

first_img 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. Behavior of single protein observed in unprecedented detail by Stanford chemists “The key to making ABEL work,” says Cohen, “is to do the feedback as quickly and accurately as possible. However, as we try to trap ever-smaller particles, this task becomes challenging for two reasons. First, smaller particles diffuse faster – the amount of diffusion is inversely proportional to the radius of the particle, so a 1 nm particle diffuses 10 times faster than a 10 nm particle. Second, smaller particles tend to be dimmer – and in the limit of having just one fluorescent dye molecule, we don’t get very many photons from it. So in the end, we’re trying to follow the motion of this incredibly quickly moving, dim object, and we need to do this with sub-millisecond resolution in time and micron-scale resolution in space. That’s hard to do.”The primary innovation that allows the ABEL trap to trap single dye molecules is a statistically rigorous tracking algorithm that makes nearly optimal use of the information in every detected photon, which Fields designed and implemented in custom digital hardware (called a Field Programmable Gate Array, or FPGA). “The FPGA can run the algorithm tens of thousands of times per second,” explains Cohen, “so every time we detect a photon from a trapped molecule, the algorithm incorporates this information into its estimate of where the particle was, generates the appropriate feedback signals, and then waits until the next photon detection.” Play A series of Alexa 647 molecules are trapped until photobleaching or diffusional escape. The movie is shown in real time. Video (c) PNAS, DOI:10.1073/pnas.1103554108 The result is an imaging and detection system that performs the fastest and most sensitive tracking to date by combining all photon information in a statistically optimal way that generates the most likely estimate of the location of a photon’s source. Moreover, implementing the algorithm on the FPGA runs the algorithm in 9 μs, which is significantly less than the typical interval between photon emissions. (By way of comparison, the CCD camera-based system took 4.5 ms to process emitted photon data, and the algorithm prior to that developed by Fields required 25 μs.) Cohen acknowledges that despite these advances, ABEL is not perfect. “One limitation to that ABEL can only trap for a few seconds because the oxygen-sensitive dye molecule is subject to laser-induced photobleaching. Optical excitation has a small probability of resulting in a photochemical change that disrupts the dye molecule.” However, he adds that photobleaching can be minimized by adding chemicals that consume oxygen, as well as other chemicals that decrease its impact, such as antioxidants and free- radical scavengers.Going forward, Cohen is interested in layering other kinds of spectroscopy on top of the trapping. “We want to shine different colors of light onto the trapped molecule, and so get more information out of the photons – their polarization, wavelength, and precise timing – that the molecule emits. This additional information will give us a more detailed picture of what the one molecule is doing inside the trap”Cohen also is investigating the addition of various fluidics to facilitate the inflow and outflow of different reagents. “It would be great if we could trap an enzyme, say, and then flow in substrate or ATP, and see how the dynamics of the enzyme change.”Regarding applications, Cohen is hoping in the near term to study the dynamics of short pieces of DNA and DNA-protein interactions. “DNA has been incredibly well studied, of course; but there are still really fundamental and important things we don’t know,” he points out. “For example, we don’t know what happens to DNA if you bend it very sharply, or how the mechanical properties of DNA depend on its underlying sequence. These questions are important to the function of DNA in a cell, because DNA in a cell is often highly bent around histones or by DNA-binding proteins. We also don’t fully understand how DNA-binding proteins find their specific binding sites on the molecule. It’s possible that the proteins are probing the local mechanical properties of the molecule as part of their search.”In the longer term, the team would like to study the internal dynamics of a wide range of proteins and molecular machines. “Now that we can trap nearly any molecule without tethering it to a surface, we can hope to look at the dynamics of many individual molecules that thus far have been impossible to study at the single-molecule level.” 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 Citation: Where no lab has gone before: Single-Molecule Electrokinetic Traps (2011, May 25) retrieved 18 August 2019 from https://phys.org/news/2011-05-lab-single-molecule-electrokinetic.html • Electrokinetic trapping at the one nanometer limit, PNAS Published online before print May 11, 2011, DOI:10.1073/pnas.1103554108• Cohen Lab at Harvard University Copyright 2011 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. More information: (PhysOrg.com) — To study the behavior of large protein complexes and long DNA chains in solution, researchers use so-called molecular traps. However, earlier traps have proven ineffective when working with small molecules due to the latter’s high diffusion. This limitation was first addressed through single-molecule immobilization techniques such as surface attachment and laser tweezers, but there were drawbacks: the former can disrupt biochemical structures, while the latter require molecules to be attached to large beads. A later trap developed at Stanford University used computer-based image capture and processing to track a single molecule’s Brownian motion, which it then cancels by applying variable voltage feedback. Now, however, Harvard University researchers have devised an Anti-Brownian ELectrokinetic (ABEL) trap that couples fluorescence microscopy to real-time electrokinetic feedback to trap any soluble fluorescence-capable molecule up to 800 times less massive than was previously possible. Developed at Harvard University by Prof. Adam E. Cohen in the Departments of Physics and of Chemistry and Chemical Biology, and Alex Fields, his student in the Biophysics Program, the ABEL trap works by following the Brownian motion of a particle, and then applying feedback forces to the particle to suppress this Brownian motion. The system uses fluorescence (from a dye molecule attached to that particle) to track the Brownian motion of the particle with a high degree of precision without damaging it. Molecular traps face a basic challenge that has been historically difficult to overcome – namely, the differences in behavior between atoms in a low-temperature vacuum, which follow Newton’s laws of inertia and momentum, and those in solution. In the latter case, molecules collide every few picoseconds (as opposed to billions of times per second in a gas at atmospheric pressure, and only once every few seconds for typical atom trapping done at ultra-high vacuum), making it very difficult to track and analyze their positions and trajectories. This therefore requires a very different molecular trapping strategy.While fluorescence has been employed in single-molecule imaging since the 1990s, these early systems required molecules to be immobilized on the surface of a slide using a chemical tether. Unfortunately, the tether often perturbed or modified the particle being trapped, so that there was no guarantee that it was behaving as it would if free in solution. Other early traps required molecules to be attached to small bead-like structures in order to be immobilized, which also often perturbed the molecule under study.However, Cohen’s work with W. E. Moerner at Stanford University in 2005 led to traps that connected a CCD camera to a computer and determined the molecule’s position via real-time image fitting. The computer then applied a time-varying feedback voltage to the solution so that the electrophoretic and electroosmotic drifts combined to cancel the Brownian motion. Despite the significant progress made, the system’s speed was limited by software speed and the frame-rate of the camera. During his last year at Stanford, however, Cohen updated the trap with custom hardware that by having single-photon sensitivity allowed not only more precise measurement but the ability to determine where a photon had originated. Explore further Instrumentation. Two electrooptic deflectors (EODs) scan light from a 633 nm HeNe laser among a set of 27 discrete points with a dwell time of 3.1 μs per point. Fluorescence emitted by a fluorophore in the sample cell (Top Right) is separated from the illumination by a dichroic mirror (DM) and detected by an avalanche photodiode single-photon counting module (SPCM). A Kalman filter implemented on a field-programmable gate array incorporates the information from each photon detection into a running estimate of the fluorophore position, and generates appropriate feedback voltages that are amplified and applied to the sample cell via four platinum electrodes. The latency of the feedback loop (between photon detection and voltage response) is 9 μs. Image (c) PNAS, DOI:10.1073/pnas.1103554108last_img read more

Study finds pigeons use bodies to turn rather than wing force

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Researchers discover vine that is able to mimic multiple hosts

first_img(Phys.org) —Ernesto Gianoli and Fernando Carrasco-Urra, researchers working in Chile and Argentina have discovered a truly unique plant—Boquila trifoliolata—a vine native to the area that the research pair has discovered, is able to mimic multiple hosts—a first for the plant world. In their paper published in the journal Current Biology, the duo describes the vine and its unique attributes. © 2014 Phys.org Boquila trifoliata. Credit: Wikipedia Explore further More information: Leaf Mimicry in a Climbing Plant Protects against Herbivory, Current Biology, In Press Corrected Proof, dx.doi.org/10.1016/j.cub.2014.03.010 Fossils of earliest stick insect to mimic plants discoveredcenter_img 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. Many examples of mimicking exist in the animal world, with some specimens able to mimic multiple hosts. Less common is mimicking in the plant world, especially when it’s on-demand. Many plants have evolved to look like other plants, but very few are able to change the way they look when the need arises, and until now, no plant has been known to be able to do so with more than one plant (mimetic polymorphism). B. trifoliolata is a true exception, it can change the shape, size and color of its leaves, and can even do so to mimic several other plant types, at the same time—it is a true chameleon.The researchers suggest the special abilities of the plant have evolved as a means of self preservation. They found that the same plant living on the forest floor had a 33 percent greater chance of being eaten by a passing herbivore, and those living on trees had it worse, there was a near 100 percent certainty that they would be eaten.In being able to change on they fly, so to speak, the plant exhibits near animal capabilities, able to grow its leaves to ten times their normal size. It can even change the vein patterns in its leaves to match those of the host, demonstrating an ability that was until now, believed impossible in plants. The vine has its roots in the ground and like other vines, climbs up and onto other structures, be they trees, bushes or even human made structures. As it does so, it takes on the characteristics of the tree it’s using as a host, masking itself from those that would eat it. Presumably, the vines are able to somehow “choose” their host, as climbing onto a plant that animals eat wouldn’t help much.The researchers have no idea how the vines do what they do, though they guess it might have to do with an ability to detect odors from the host, or even microbes that live in them, triggering gene-activating signals in the vines. Journal information: Current Biology Citation: Researchers discover vine that is able to mimic multiple hosts (2014, April 28) retrieved 18 August 2019 from https://phys.org/news/2014-04-vine-mimic-multiple-hosts.htmllast_img read more

Probing the limits of wind power generation

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Swinging to Sufism

Remember the song Khwaja Mere Khwaja from the film Jodha Akbar? More than the lyrics what realy appealed was the choreography used in it. Grabbing eyeballs instantly, the dance reflected divine vibes.Popularly known as Whirling Dervishes, the dance was founded in year 1273 by Jalal ad-Din Muhammad Rumi, known as the founder of Sufism. Since then, this Turkish dance form has created waves across the world for its spiritual significance and unique features. Also Read – ‘Playing Jojo was emotionally exhausting’‘Whirling Dervishes is a well-known form of Sufi dance that was established by Hüsamettin Çelebi, a follower of Jalal ad-Din Muhammad Rumi in 1273 in Konya. Dervish means initiation of the journey on the path of Sufism and Whirling denotes a part of a formal Sama ceremony [Sama is an Arabic word which means ‘listening’ in English]. The performers of Whirling Dervishes are called Semazens,’ explained Ozgur Ayturk, Counselor, Turkish Culture and Tourism. Also Read – Leslie doing new comedy special with Netflix‘The origin of this form of song and dance dates back when Jalal ad-Din Muhammad Rumi was walking through the marketplace one day and heard the rhythmic hammering of the goldbeaters. It is believed that Rumi heard the dhikr, ‘la elaha ella’llah’ — which in English means ‘There is none worthy of worship but Allah’ — spoken by the apprentices. The rhythm sent him into trance and he started swirling with his arms stretched— sowing the seeds of a unique dance form called Whirling Dervishes,’ he added. While performing the dance the dervishes wear a white gown [symbolic of death], a wide black cloak [hirka] that is symbolic of the grave and a tall brown hat [kûlah or sikke] that is symbolic of the tombstone.The dervishes practice multiple rituals, primary among them is the ‘Dhikr’. It involves recitation of devotional Islamic prayer coupled with physical exertions of movement to reach a perfect state where one is on the same level as God.The second important ritual is the ‘Sama’ which is performed by spinning on the right foot, and represents the journey of a man whose soul gets connected with the almighty in pursuit of attaining the truth and being perfect. In this he follows the truth by sharing love and foregoing his ego to be ‘Perfect’. He then returns as a man who has reached maturity and greater perfection, able to love and to be of service to the whole of creation. Some of the ceremonies celebrated during Sama are Naat and Taksim, Devr-i Veled, The Four Salams and Concluding Prayer.Practising Whirling Dervishes since 1990, the Turkish dance troupe called The Konya Turkish Tasawwuf Music Ensemble will be performing in the Capital, centered around the theme Sema with Sufi music. Sema came out of the inspiration on the 13th century Muslim scholar, poet and mystic, Mevlanna Celaleddin Rumi. Sema represents the true spiritual journey to maturity. It is like an ascent to heaven and return to earth. Over the centuries, Sema has become a part of Turkish beliefs, traditions and history. Sema is made up of seven sections, each section having a distinct meaning.‘We know that both India and Turkey have been influenced by Sufism deeply and a strong tradition coming through centuries is still active in both the countries. Therefore we believe organising this kind of events will help both the nations understand the rich heritage of each other on sufism and make the peoples of two countries come closer,’ concluded Ayturk.DETAILWhen: 27 OctoberAt: Delhi International Art Festival,  Purana Qila When: 28 OctoberAt: Rashtrapati Bhavan read more

Delhi women it is time to get kicking

first_imgWith crimes against women increasing, the need has been felt for every woman being able to possess the basic knowledge about self-defence — and to meet this need, sports and fitness consultancy firm Endzone has announced free self-defence camps for women.The Capital has, of late, witnessed a number of crimes against women and the most recent was the gang-rape of a 23-year-old girl in a moving bus 16 December, which shook the entire nation.According to Divyu Gupta, vice president of Endzone, knowing the techniques of self-defence helps build confidence among women. ‘Today, when women’s safety is at stake, we believe that it is time that maximum awareness about self-defence is created. Although we’ve been conducting classes for quite some time now, we feel that we must do more in order to reach out to as many women as possible,’ Gupta said.‘As an initiative, we are announcing free self-defence workshops in Delhi and NCR for girls and women of all age groups,’ he added. The workshops will be conducted in January and one can get the details from the website endzone.co.in.last_img read more

City foodie scales new highs

first_imgFor food enthusiasts in the Capital, February came with good news. For it’s the month when Delhi marked its foray into Mumbai’s food zone. Leading the way was city-based Lite Bite Foods — the group has over eight core brands under its umbrella — who have been awarded the food and beverage concessions at the new Terminal 2 at the Mumbai international Airport (CSIA) with Package 1. It is made up of 21 outlets that includes the International Security Hold Area (SHA) Food court and the domestic SHA departure non-food court outlets — and Package 3, comprising a total of nine outlets pre-security and at arrivals outlets. Also Read – ‘Playing Jojo was emotionally exhausting’‘We have business in Mumbai and Pune but this is a big achievement for us. It gives us a massive entry point to the West,’ says Rohit Aggarwal, Executive Director, LBF. ‘All of us at LBF are very excited on winning this concession. MIAL has created a world class Terminal with T2 and we intend to do our part to live up to their vision and expectation by offering the highest culinary standards and an enhanced customer experience,’ says Amit Burman, Chairman, LBF. Also Read – Leslie doing new comedy special with NetflixSo what does it mean for the city-based F&B company? ‘It gives you a larger canvas…a quality canvas. GVK has been pretty picky and choosy. On paper we have scored well. Now to execute it will be a challenge,’ says a cautious Aggarwal. Lite Bite Foods also plans to take their signature restaurants from Delhi straight to Mumbai airport. So city travellers flying to Mumbai can soon expect to see some of their favourite outlets like Zambar, Fresco, Punjab Grill, Asia Seven, Pinos pizza and pasta and Street Foods of India at the Mumbai airport. The five-year old company has already tied up with some multinational chains, international brands and some of Mumbai’s popular joints but Aggarwal prefers to remain tight-lipped about the details. ‘We will sit with other outlets and put in our concepts,’ he says.last_img read more

2014 has been an amazing year

first_imgHollywood beauty Angelina Jolie has had an amazing 2014 after getting married and releasing her movie Unbroken.The 39-year-old actress-director is thrilled that her new movie Unbroken is getting Oscar buzz, reported Contactmusic.When asked if she’s had the best year of her life, she said, “Well, I hope that one is still to come. But it’s been an amazing year. I married my love, my son (Maddox) became a teenager and I got to bring this film to the world.” Also Read – A fresh blend of fameMeanwhile, the Oscar-winning actress wasn’t surprised she had to prove she should direct the World War II-set drama.“I fought hard for the opportunity. I’d directed only one other film, which was very small in comparison. I had to prove I could handle locations, the budget, balancing two plane crashes, the visual effects and the technical aspects.“I had not done anything like that before! I had to go to school quickly, then I pitched my little heart out,” she added She’s a gorgeous globetrotting movie star with an Oscar, six kids and new husband Brad Pitt to hold her purse.  But she still has moments of insecurity.last_img read more

Maulana Abul Kalam Azad Institute of Technology launches placement eportal

first_imgKolkata: State Education minister Partha Chatterjee launched the placement e-portal of Maulana Abul Kalam Azad Institute of Technology (Makaut) – makautplacement.com.Vice-Chancellor of Makaut, Saikat Maitra said: “We are keen to showcase our talented students to the national and international job market thorough this portal. The resume of the students will be extensively visible to potential employers. Our academic curriculum has gone through an immense transformation and reformation lately. This is an effort on our part to appease the quest of various organisations and employers seeking suitable candidates.” Also Read – Heavy rain hits traffic, flightsThe website contains information about a few thousands of skilled and qualified job seeking students from 196 affiliated colleges under Makaut.Maitra added that in the next phase the portal will have the database of various industries along with their requirements.”This will enable the students of our affiliated colleges to look for job vacancies and apply accordingly by browsing the web portal. The portal will enhance linkage of academia and industries effectively,’ a senior official of Makaut said. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedState Education minister Partha Chatterjee at the formal launch said: “Makaut has pioneered a web portal which caters to procuring placement assistance to all the students of its affiliated colleges in engineering, technology, pharmacy, management, architecture and various other professional courses. I hope that the students of the state will be immensely benefitted from this placement portal.”The minister has urged all the affiliated colleges to upload the database of their students in quick time on the portal so that the students reapthe benefits.According to a Makaut official, this portal will be contain the details of all the students of its affiliated colleges with their academic and experience backgrounds who could be selected for internships and placements by the prospectiveemployers.The portal has been developed by the web team of iLead. Chairman of iLead Pradip Chopra was also present.last_img read more