(Visited 817 times, 1 visits today)FacebookTwitterPinterestSave分享0 Before swallowing the hype about the latest dino-bird fossil, ask some hard questions.When something really unusual turns up, skeptical observers should not just take a scientist’s word for it. That’s especially good advice when the scientist has a bias toward a preconceived worldview of the past history of the earth. In this case, evolutionists tell us that birds evolved from dinosaurs—indeed, that birds are dinosaurs. A new ‘dino-bird’ fossil turned up after an unknown period of time in Brussels that supposedly first came from Mongolia. What is it? Laura Geggel says in Live Science, “This Dinosaur Fossil Was So Bizarre, Scientists Thought It Was Fake.” They dutifully published the artist reconstruction anyway, saying,Caution: All they found were bones in rock pieces glued together.An enigmatic dinosaur — which sported a swan-like neck, amphibious flippers and Velociraptor-esque claws — could walk like a duck and swim like a penguin during its heyday on Earth, scientists have found after examining its fossilized remains.In fact, the remains, which were on the black market for years, painted such a wacky image of a dinosaur that paleontologists thought it was a sophisticated fake at first.Naturally, the news-hungry organizations like National Geographic and Fox News Science quickly posted the same picture and interpretation.A research team including well-known dinosaur hunter Phillip Currie did some analysis on the rock and the bones, and decided it was not fake. They published it in Nature with all the usual Latin, taxonomy and descriptions as with any new fossil, but you would have to dig into the Supplementary Materials PDF file to read about how it was found:Originally poached from the Ukhaa Tolgod locality (according to associated documents, deposited at MPC together with the specimen), MPC-D102/109 resided in private collections in Japan and England for an unknown amount of time. In 2015, the specimen was transferred to the Royal Belgian Institute of Natural Sciences through the French company Eldonia. Subsequent negotiations between the RBINS, Eldonia and Mongolian authorities, in the scope of the official cooperation agreement between the Ministry of Education, Culture and Science of Mongolia, the Belgian Science Policy Office and the RBINS, led to the official return of the specimen to the Institute of Paleontology and Geology, Mongolian Academy of Sciences. MPC-D102/109 was incompletely prepared when it arrived at RBINS. Preliminary preparation under the supervision of PG allows us to certify that this specimen is not a composite.If there was “preliminary preparation” to certify it was not a composite, like the infamous Archaeoraptor that laid egg on the face of National Geographic in 1999, what will ‘subsequent preparation’ determine? That’s not all; there’s glue holding the pieces together:The block is crossed by several fractures, including one consolidated with glue: nevertheless, the sediment shows good structural continuity and all the fractures in the matrix continue within the bones (Extended Data Figures 2a-d). This indicates that the specimen is not an assemblage of bones from distinct individuals glued together on the matrix block: all restoration done on the specimen before our analyses was thus aimed at consolidating and stabilising the block including the skeleton. Minor portions of few exposed bones had been restored in plaster. In the skull, only the anterior half of both nasals and the anterior end of the exposed (right) maxilla, anterior to the antorbital fenestra, have been reconstructed in plaster. The rest of the exposed skull shows no signs of being restored, as also confirmed by the overall correspondence and symmetry with the cranial elements still inside the block matrix. In the postcranial skeleton, only some elements of the exposed hand were restored in plaster: restoration affected particularly the badly preserved epiphyses (proximal and distal extremities) of many elements and metacarpal I entirely (Extended Data Figure 3). Given that epiphyseal dissolution affected also the right forelimb that is still inside the block, the absence of epiphyseal bone in the exposed hand is not caused by restoration, and is interpreted as a pre-burial phenomenon (e.g., soft tissue decay and invertebrate scavenging that targeted the least ossified elements of the skeleton).In short, there is a great deal of interpretation going on. Scientists are fallible. They can declare their opinion that this fossil is genuine, and indeed it may be. But before accepting their judgment, we should recall the critical opinions of liberal scientists who questioned the authenticity of some artifacts in the Museum of the Bible (see 11/18/17). Those criticisms concerned artifacts only a couple of thousand years old, not tens of millions like this Cretaceous-era specimen is claimed to be. Are secular paleontologists immune from being fooled? Remember, they only found bones in a questionable rock, not any of the non-skeletal remains pictured in white feathers in the artwork. The bones, moreover, are hollow, as in birds; so why are they calling it a dinosaur? Evolutionists have a vested interest in making dinosaurs as bird-like as they can, and birds as dinosaur-like as they can. They do this with ‘hominid’ fossils, too.Sometimes, however, fossils throw a curve ball at evolutionists. That happened with platypus a century ago. Like platypus, it’s not clear this fossil is helping the evolutionary story. They wave the magic wand of ‘convergent evolution’ in their last sentence:This lineage adds an amphibious ecomorphology to those evolved by maniraptorans: it acquired a predatory mode that relied mainly on neck hyperelongation for food procurement, it coupled the obligatory bipedalism of theropods with forelimb proportions that may support a swimming function, and it developed postural adaptations convergent with short-tailed birds.Did this creature choose to evolve this way? Did it purposely ‘acquire’ and ‘develop’ traits that make it like a mixture of creatures? Fox News says,It walked like an ostrich, had flippers and could swim like a penguin, had a bill like a duck and a neck like a swan but had killer claws and teeth like a crocodile, which it needed because it was a meat-eating dinosaur.(Note: dietary habits were not observed.) In the same flock, National Geographic quacks,More than 70 million years ago, a creature roaming Earth’s ancient wetlands may have looked like a duck and hunted like a duck—but it was really a dinosaur related to Velociraptor.The man on the street will have a different answer to, “If it looks like a duck and walks like a duck…”This fossil may represent a new kind of creature, but certain questions should be addressed first:Are there other paleontologists questioning the provenance of the bones?Are there other paleontologists concerned about the glue and plaster, who suspect fraud?Did the poachers of this fossil have a financial motive for selling this specimen?What happened to it in the many other places where it was stored?Why is this specimen unique?On that last question, we should note that specimens are members of a species—a population that had to be large enough to breed and interact with an ecosystem. There had to be many of these whatever-they-were’s to exist. Where are they? So many unique specimens are coming from China and Mongolia, it should seem very odd that these same creatures are not usually found in other parts of the world.We’re just asking. This may represent a great new advance in the understanding of prehistoric life. Before anyone accepts the artwork, though, some critical questions ought to be answered.
From teacher to broadcaster and now back to working with youth, news anchor Pat Pillai has come a long way. In his new home at LifeCo UnLtd SA, he plans to help young South Africans live lives more in the spirit of Nelson Mandela. Pat Pillai gave up his news job to run his organisation, LifeCo UnLtd SA. Through it, he aims to help young South Africans achieve big things. (Image: TV with Thinus)• My Africa Is … not what you think• Archive: Nelson Mandela at Davos • Khi Solar One: renewable energy for the ages• Using the arts to build an inclusive South Africa• Young people: own your destiny! Staff writerPat Pillai, the veteran anchorman of eNews, has left the programme to focus all his efforts on his philanthropic organisation, LifeCo UnLtd SA.The move comes after the group received an investment of R40-million to help its efforts to motivate young people to live like Nelson Mandela.Pillai, who spent more than a decade at ETV news, will now be the full-time chief executive of LifeCo UnLtd SA. He founded the organisation Life College Group in 1997, and used his free time to work there as a volunteer. It later merged with UnLtd SA to form LifeCo UnLtd SA.Online media news platform Screenafrica reports that LifeCo has helped more than 55 000 South African children, teaching them life skills and boosting academic and entrepreneurial potential.About the investment, Pillai said: “The demand for our work has grown nationally and needs a special focus. Our youth leaders and entrepreneurs need us more than ever.”One of the group’s programmes is Nelson Mandela – the Champion Within, which was launched in Port Elizabeth in 2012. In an interview with Pretoria News, Pillai said many of the self-guides in the programme were based on portions of Mandela’s writings.The programme allows students to interact with leaders in the business, political and educational sectors on issues of character, attitude, communication, tolerance and success. LifeCo hopes to expand the programme to students all over South Africa by 2020.In an interview with Global X, Pillai named his grandfather as one of the influences behind his starting LifeCo. Global X is an interview series focused on social entrepreneurs on the Skoll Foundation’s Social Edge website.Pillai’s grandfather was a waiter at the Mount Nelson Hotel in Cape Town. As a waiter, he would stand in the background, listening to people like Winston Churchill and other political leaders, as well as visiting royalty, talk during their meetings. “He said: ‘I could never sit at the table and I hope that one day my son, my grandson would be able to sit with people that lead thoughts and social change.’ And that stuck with me.”Growing up on the Cape Flats on the outskirts of Cape Town, Pillai had family members who struggled with drugs, poverty and abuse. Now, he wants to break that cycle of poverty. “We want them [students] to leave school with a wider world view, not of a slave mentality but a champion mentality.”He explained that Life College aimed to develop character education. “They would test and refine what real life projects that they will run.”Pillai was a young education student, but he chose to study drama to help with a stutter and fear of public speaking. It stood him in good stead for his broadcasting career. Pillai won a Vita Award for his work as a stage actor and appeared in the 1993 film Friends, directed by Elaine Proctor.He qualified as a teacher, however, and soon realised that the public school system was doing little to nurture a true readiness for life in its students. His first attempt at a model similar to LifeCo failed. After a few years, in 1997, he tried a second time with a revised strategy and methodology. He used the income from the sale of his drama company to launch with just 16 students.Wishing Pat Pillay all the best, I feel so sad I won’t be seeing him on etv anymore. May God bless you we will definitely miss you #farewell— Ntsikie (@ntsikiem) February 26, 2015Once again, he is leaving the public eye to return to educating the country’s youth. His last eNews bulletin was on 26 February, prompting his fans to tweet their gratitude and farewells.Patrick Controy, the managing director of ESAT, agreed, saying Pillai had played an enormous role at eNews. “He has helped us turn our nightly newscast into the most watched English news bulletin in the country.”
Share Facebook Twitter Google + LinkedIn Pinterest As the calendar turns to July, many corn and soybean fields are well on their way. Due to the very challenging spring, however, scouting those fields throughout the growing season will be key. Matt Hutcheson, Product Manager for Seed Consultants, gives some tips on what to scout for over the summer.
PANAJI: The Bharatiya Bhasha Suraksha Manch (BBSM) on Wednesday announced a week-long dharna across the State between June 26 to July 2 to protest against the Goa government’s failure to support primary education in regional languages.“The token dharna will be to protest against the betrayal of the regional languages, Konkani and Marathi, by Chief Minister Manohar Parrikar by failing to implement a medium of instruction policy in favour of regional languages, and instead continuing government grants for English medium primary schools of the archdiocese,” said BBSM convenor Subhash Velingkar. The BBSM is an RSS-dominated movement spearheading the cause of regional languages as medium of instruction at the primary level. Mr. Velingkar and former MLA Uday Bhembre on Wednesday accused the Parrikar government of stifling Marathi/Konkani language education in the State.
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By Kunal Dutt New Delhi/Mumbai, June 30 (PTI) In a double cheer for India, two building clusters of Victorian Gothic and Art Deco architectural styles in Mumbai were today jointly inscribed in the UNESCO World Heritage List, pushing the country’s financial capital high on global cultural map.This is the third such honour for the metropolis after the Elephanta Caves and the majestic Victoria Terminus — rechristened Chhatrapati Shivaji Terminus railway station railway station — which earned the coveted tag in 1987 and 2004 respectively.”Just inscribed as @UNESCO #WorldHeritage site: Victorian Gothic and Art Deco Ensembles of Mumbai, #India Congratulations!,” UNSECO tweeted.The decision was taken during the 42nd session of the UNESCO World Heritage Committee (WHC), currently underway in Manama, Bahrain.Mumbai-based conservation architect Abha Narain Lambah, who prepared the voluminous nomination dossier ‘Victorian Gothic and Art Deco Ensembles of Mumbai’, said it is a great honour for the city and for India. “These buildings are of iconic architectural styles. They represent a living heritage of the country, and the evolution of the landscape of the city over nearly two centuries. It puts Mumbai, perennially described the ‘financial city’, high up on global cultural map.”All 21 countries in the WHC supported the nomination which is very rare. Azerbaijan called it the ‘perfect’ dossier and France as observer country termed it ‘magnificent’, ” Lambah told PTI over phone from Manama.India hailed the decision as a “remarkable achievement”.The Union Culture Ministry said that with this UNESCO tag, the count of World Heritage Sites in the country has now risen to 37, of which 29 are cultural, seven natural and one mixed site.advertisementIn a statement, it said the ensemble consists of 94 buildings primarily of 19th century Victorian Gothic revival and early 20th century Art Deco style of architecture.”The Victorian buildings form part of the larger Fort precinct situated to the east of the Oval Maidan. These public buildings, include the Old Secretariat (1857-74), University Library and Convention Hall (1874-78), the Bombay High Court (1878), the Public Works Department Office (1872), Watson’s Hotel (1869), David Sasoon Library (1870), the Elphinstone College (1888),” it said.Union Minister of State for Culture Mahesh Sharma congratulated the residents of Mumbai and the entire country for this landmark achievement. “The international recognition to the heritage precinct of the city of Mumbai is a matter of great pride to the nation and it will boost the local economy in a number of ways.”This achievement is expected to give a tremendous fillip to domestic and international tourism leading to increased employment generation, creation of world-class infrastructure and augmentation of sale of local handicrafts, handlooms and heritage memorabilia,” he said.Lambah said Prince of Wales Museum (now Chhatrapati Shivaji Maharaj Vastu Sangrahalaya) and NGMA (National Gallery of Modern Art) are also in the Victorian Gothic list that would now be celebrated even more.”The buildings on the first row of Marine Drive, the Regal and Eros Cinemas count among the Art Deco structures that have earned the recognition.”This is different from previous nominations as, earlier either very ancient or medieval buildings were recognised. But in this case, we have government buildings like the High Court, the Mumbai Police Headquarters, private houses and cultural spaces and sports facilities, which belong to the modern era,” Lambah said.The city now has equal number of UNESCO sites as Delhi, which has three — Red Fort, Qutub Minar and Humayun’s Tomb, she said, adding Maharashtra now has a total of five such sites, including the Ajanta and Ellora caves in Aurangabad.Vice-President of International Council on Monuments and Sites (ICOMOS) Rohit Jigyasu also hailed the recognition as a big achievement for India, saying that an ICOMOS team had last year inspected the buildings part of the ensembles after the nominations were sent to UNESCO.The nomination, in three volumes, ran into over 1,200 pages and contained old maps, photographs, drawings and notes about several buildings.Mumbai-based conservation architect Vikas Dilawari, who had worked on the nomination dossier for Victoria Terminus, said, “Several of these buildings are already protected and I am sure this UNESCO tag will further help in creating a climate of historical preservation in Mumbai and other parts of the country. Of course, I am delighted as a countryman, but would have been happier if more buildings could have been included in the list, such as the famed Municipal Building.””But, from VT to this, it’s been 14 years and we have added more buildings, so hopefully in the future, the UNESCO tag footprint will expand and perhaps include whole Fort area,” he said.advertisementLast year, Ahmedabad was declared as a World Heritage City, the first city in India to have earned that tag.The culture ministry said in the last five years alone, India got seven of its properties/sites inscribed in the World Heritage List of UNESCO, adding, while India stands second largest after China in terms of number of World Heritage properties in ASPAC (Asia and Pacific) region, it is overall sixth in the world. PTI KND ASG NSDNSD
TV and Movies i really loved new #StrangerThings but i’m most excited for everyone to see it and fall madly in love with maya hawke, who is just wonderful. she stole the season for me. pic.twitter.com/66UajQQ1yo— lindsey romain (@lindseyromain) July 1, 2019 So there’s not much more I can say, but I was so impressed with the way specific ships sailed & laughed out loud at least once per episode (mostly at DAD Hopper). Also a shopping scene 🥰 #strangerthings— Emily Longeretta (@emilylongeretta) June 30, 2019 1 Stranger Things is looking good. Netflix Things are about to get Strange. The third season of Netflix’s hit series Stranger Things arrives on July 4, and while it may be a stressful summer in Hawkins, Indiana, it’s looking like a great one for fans. The embargo for reviews lifted on Sunday, and critics shared their opinions. Now playing: Watch this: I think I can finally tell you that #StrangerThings is the show’s best season yet. It’s not perfect (more on that later) but there are moments that are so good, so funny, so deeply heartfelt that it will leave you breathless. It’s also spectacularly gross and I loved it.— Crystal Bell (@crystalbell) June 30, 2019 We know from the recent final trailer that Billy (Dacre Montgomery) could be the target of some Upside Down evil this season. But apparently he’s also a great character this year. “Billy f****** owns,” Colburn writes. Look at this baller piece of clothing pic.twitter.com/bbwhkjQLTI— Aᴀʀᴏɴ Pʀᴜɴᴇʀ (@AaronFlux) July 1, 2019 Now that I’ve seen some of #StrangerThings I am not only hit with a huge powerful wave of nostalgia (I was 9 in 1985) I am seriously wondering if we’ll see the absolute worst 80s fashion come back in style. Again.— Aᴀʀᴏɴ Pʀᴜɴᴇʀ (@AaronFlux) July 1, 2019 i’ve watched #StrangerThings twice now and i think people who already hate it will find even more to hate but i truly believe the show transcends its inelegant ’80s pop culture flirtations with top-notch character work and archetypal subversion. billy fucking owns.— Randall Colburn (@randallcolburn) June 30, 2019 See all the Stranger Things season 3 photos And CNET sister site ComicBook.com says the 1980s references are just too much. “It’s entertaining to see beloved characters embracing the spirit of goofy ’80s films, but these homages feel so blatant that it feels more like a parody than a tribute,” the ComicBook review reads.Character critiquesThere will be plenty of familiar faces and a few new ones in Hawkins this season. Who stands out? She’s not alone in calling this season the best so far. Randall Colburn, internet culture editor for The AV Club, calls season 3 the show’s “best season by leaps and bounds.” Stranger Things 3 a brilliant return to form Share your voice To Lindsey Romain of Nerdist, the standout is 20-year-old Maya Hawke (yes, real-life daughter of Ethan Hawke and Uma Thurman), who plays new character Robin, who apparently works with Steve at Scoops Ahoy, the ice-cream shop in Starcourt Mall. “She stole the season for me,” Romain writes. it’s the best season by leaps and bounds— Randall Colburn (@randallcolburn) June 30, 2019 It’s what fans wanted to hear. CNET’s own Jennifer Bisset calls season 3 “a brilliant return to form,” adding that it brings the focus back to the elements that made the first season such an unexpected hit. “This season’s sense of fun, along with its relationship drama and multiple odd pair-ups bring humor and touching moments that recall Game of Thrones at its best,” she writes.MTVNews culture director Crystal Bell tweeted, “I think I can finally tell you that #StrangerThings is the show’s best season yet.” Wrote about the new season of #StrangerThings, which is basically a love letter to old-school tech, shopping malls &, of course, dope retro fits & wild haircuts. The Duffer Brothers did it again: best season yet. (Fret not, didn’t spoil the sauce for you.) https://t.co/pBJ9lcm78S— Edgar Alvarez (@abcdedgar) June 30, 2019 And Police Chief Jim Hopper brings the laughs, according to Emily Longeretta of Us Weekly, who says she “laughed out loud at least once per episode (mostly at DAD Hopper).” Some of the humor in #StrangerThings this season is very broad – too broad, especially early on. On the other hand, this felt like the goriest season yet, which, of course, I was very happy about. I had a couple “oh, I probably shouldn’t be eating right now” moments. Yay, gore!— Eric Goldman (@TheEricGoldman) July 1, 2019 Comment Tags Back to the futureIf you’re a 1980s nostalgic, get ready for an awesome and totally tubular summer, as numerous critics say the show’s 1980s references are back. Edgar Alvarez of Engadget not only proclaims this the “best season yet,” but declares the new season is “basically a love letter to old-school tech, shopping malls &, of course, dope retro fits & wild haircuts.”But not everyone is ready for those faddish fashions to return. For reference, I was a huge supporter of jams shorts. Internet picture for reference. pic.twitter.com/Fb2eRCEP6V— Aᴀʀᴏɴ Pʀᴜɴᴇʀ (@AaronFlux) July 1, 2019 Stranger Things season 3: Everything to know Originally published July 1, 12:36 a.m. PT. Update, 9:25 a.m. PT: Adds more reviews. And at press time, the third season had a 92 percent Certified Fresh rating on Rotten Tomatoes, and a Metascore of 71, indicating “generally favorable reviews,” on CNET sister site Metacritic.Stranger Things season 3 will be available on Netflix on July 4. 59 Photos Gross-out gangAnd in case you forgot this show has a horror theme, Eric Goldman of getFandom is there to remind you. “This felt like the goriest season yet,” he writes, “I had a couple ‘oh, I probably shouldn’t be eating right now’ moments. Yay, gore! 2:33 Our season 3 review Netflix
Pakistani security personnel stand next to burned out vehicles in front of the Chinese consulate after an attack in Karachi on 23 November 2018. At least two policemen were killed when unidentified gunmen stormed the Chinese consulate in the Pakistani port city of Karachi on November 23, officials said. Photo: AFPFour people were killed on Friday when gunmen armed with hand grenades and a suicide vest stormed the Chinese consulate in the Pakistani city of Karachi, officials said, with the attack claimed by a separatist group which branded Beijing “an oppressor”.Pakistani authorities said that security forces had secured the area after the attack, the latest assault on Chinese nationals in the country, where Beijing has poured billions of dollars into one of the largest projects in its massive Belt and Road programme.China “strongly condemned” the attack and asked Pakistan to take measures to ensure the safety of Chinese citizens and institutions in the country, as well as the China-Pakistan Economic Corridor (CPEC) mega-project.Three gunmen tried to enter the consulate in the southern port city, but were intercepted by guards at a checkpoint, Karachi police chief Ameer Sheikh told AFP.”They were holding Kalashnikovs. First, they hurled a small (grenade) and then started firing,” said Allah Bakhsh, a guard at a nearby house who witnessed the attack.Police officials said two of their personnel were killed, along with a father and son from Quetta, the capital of Balochistan, who were seeking Chinese visas and were caught in the crossfire.At least one of the attackers was wearing a suicide vest which did not detonate, another senior police official said.Foreign Minister Shah Mehmood Qureshi told reporters in Islamabad that “all the terrorists have been eliminated”, and that all 21 staff at the consulate during the attack had been taken to a safe location.”Situation under control,” the military’s media wing added in a statement.- China is an ‘oppressor’ -The attack was claimed by a separatist militant group from Pakistan’s southwestern province of Balochistan, which is at the centre of the China-Pakistan Economic Corridor, the major Chinese project in the country.”We have been seeing the Chinese as an oppressor, along with Pakistani forces,” the spokesman for the Balochistan Liberation Army (BLA), Geand Baloch, told AFP by telephone from an undisclosed location, adding they were “destroying the future of Balochistan”.The BLA later emailed a statement to media in which it said the attack was “aimed at making it clear that China’s military expansionism on Baloch soil will not be tolerated”.It warned the Chinese to leave or “be prepared for continued attacks”.The group is just one of the militant outfits operating in Balochistan, Pakistan’s largest and poorest province, which is rife with ethnic, sectarian and separatist insurgencies.Residents of the resource-rich province, which borders Iran and Afghanistan, have long complained that it does not receive a fair share of the profits made from its mineral wealth.Prime minister Imran Khan said Friday’s attack would not undermine the Pakistan-China relationship, which he described in a statement as “mightier than Himalayas and deeper than Arabian Sea”.Also on Friday a bomb hidden in a carton of vegetables killed at least 20 people at a marketplace in Pakistan’s northwestern tribal region. Dozens more people were wounded, with fears the toll could rise.- Chinese investment -China, one of Pakistan’s closest allies, has poured billions into the South Asian country in recent years as part of CPEC, a massive infrastructure project that seeks to connect its western province Xinjiang with the Arabian Sea port of Gwadar in Balochistan.The project is one of the largest in Beijing’s “One Belt One Road” initiative, comprising a network of roads and sea routes involving 65 countries.Pakistan sees the project as a “gamechanger”, but it presents an enormous challenge in a country plagued by weak institutions, endemic corruption and a range of insurgencies in areas slated to host the corridor.The subject of economic dividends from CPEC is extremely sensitive in some of those areas — particularly in Balochistan.Since the beginning of the project militants have repeatedly attacked construction sites, blowing up numerous gas pipelines and trains, and targeted Chinese workers.In August this year three Chinese nationals were among six wounded in a suicide attack on a bus transporting Chinese engineers working in Balochistan, in an attack that was also claimed by the BLA.The Pakistani military has been targeting insurgencies in the province since 2004, and has been repeatedly accused by international rights groups of abuses there.Islamabad regularly accuses its eastern neighbour India of funding and arming Baloch separatists, and of targeting development projects in the province, particularly CPEC.India’s foreign ministry swiftly condemned Friday’s attack in a statement, saying: “There can be no justification whatsoever for any act of terrorism”.
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 More information: P. Ketterer et al. Nanoscale rotary apparatus formed from tight-fitting 3D DNA components, Science Advances (2016). DOI: 10.1126/sciadv.1501209AbstractWe report a nanoscale rotary mechanism that reproduces some of the dynamic properties of biological rotary motors in the absence of an energy source, such as random walks on a circle with dwells at docking sites. Our mechanism is built modularly from tight-fitting components that were self-assembled using multilayer DNA origami. The apparatus has greater structural complexity than previous mechanically interlocked objects and features a well-defined angular degree of freedom without restricting the range of rotation. We studied the dynamics of our mechanism using single-particle experiments analogous to those performed previously with actin-labeled adenosine triphosphate synthases. In our mechanism, rotor mobility, the number of docking sites, and the dwell times at these sites may be controlled through rational design. Our prototype thus realizes a working platform toward creating synthetic nanoscale rotary motors. Our methods will support creating other complex nanoscale mechanisms based on tightly fitting, sterically constrained, but mobile, DNA components. Play The assembly of the rotary apparatus. Credit: Philip Ketterer The tiny device built by the team represents the first example of a biologically inspired nanomachine capable of demonstrating dynamic motor-like behavior. It also represents a step forward in nanoarchitecture—the device was built molecule-by-molecule and perhaps is the first step towards the development of true nanorobots. They note also, that after watching their device in action, it is not difficult to envision such devices motoring around inside of people, in a way very similar to how bacteria get around. Design of a DNA-based rotary apparatus. Credit: (c) Science Advances (2016). DOI: 10.1126/sciadv.1501209 Journal information: Science Advances Play A schematic animation of the passive rotary apparatus. The bearing around the rotor also gets slightly kicked around by water molecules but it is rigidly attached to the surface. (The water molecules by which the rotor gets kicked around due to their thermal energy are not explicitly shown in the movie.) Credit: Hendrik Dietz Group develops wearable, stretchable memory device for monitoring heart rate Scientists dream of building ever smaller motorized devices that could putter around inside the human body delivering medicines to ailing parts, toxins to tumors or simply serving as health monitors, but alas, such devices have not yet come to fruition—but they may be getting closer. In this new effort, the team in Germany has built a device based on synthetic DNA parts—it mimics, somewhat, the activities of flagella, the tiny arm-like appendages bacteria use as paddles to move around. It is only 40 nanometers tall but includes three main parts, a crank that spins, an axle bearing and a container to hold the other two parts together.It does not yet have a power source, thus it cannot be called a motorized device just yet, instead, it can move around due to thermal energy which creates colliding water molecules which in turn causes the crank to turn—the team cannot control the direction of the device yet either, but believe they may have a solution sometime in the near future. They plan to test ideas using laser heat, ion flow or even chemical reactions to cause the crank to turn, and hopefully allow for controlling direction. If they succeed such a tiny motorized device would be useful in more than just medical applications—it could also possibly be used to drive chemical syntheses or to pump molecules across barriers. (Phys.org)—A trio of researchers with Technische Universität München has built a nanoscale apparatus that could one day serve as the basis for an extremely tiny motorized device. In their paper published in the journal Science Advances, the team describes how they built their device, how it works, and where they plan to take the new technology. Citation: Researchers build nanoscale rotary apparatus using tight-fitting 3D DNA components (w/ Video) (2016, February 22) retrieved 18 August 2019 from https://phys.org/news/2016-02-nanoscale-rotary-apparatus-tight-fitting-3d.html © 2016 Phys.org Explore further 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 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. 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 Play A schematic representation of freely diffusing rotary apparatus with extended crank lever. Credit: Hendrik Dietz