Birds can see webinspired Ornilux glass

first_img About 300 species of birds can be found on the island at certain times of the year.In nature, the orb-weaver spider’s web reflects UV light that protects it from being destroyed by birds. The birds can see it and do not fly through. Similarly, the protective glass coating that is being used in the UK helps birds see the glass. Otherwise, they just see sky and landscape but are not aware of any glass barriers. The Ornilux glazing reflects ultraviolet light that they can see but humans cannot unless standing up close to the glass. The special protector was developed by German company Arnold Glas and the result is called Ornilux Bird Protection Glass. The glass has a patterned, UV reflective coating, a web of lines coated on to the surface of the glass. The pattern looks like scattered sticks. Standing very close to the glass at a certain angle the human eye can see the fine veins running through it and this is what the birds see if they fly near the tower. 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. Tests suggest the coating works and the special glass can cut bird strikes. The company tested the Ornilux glass at a flight tunnel at a US nature reserve. Birds were encouraged to fly to the end of the facility which was covered with two types of glass – one containing the special coating, the other without. A net was used and no birds were injured. The experiment suggested that the innovation would prevent birds flying into coated glass in 66 to 68 percent of cases. Other Ornilux users include a wildlife center in Canada, a zoo in Germany, a mountain railway building in Austria, and a school in the U.S. An Arnold Glas source said she hoped more developers and architects look for ways to be more bird-friendly with their designs.Arnold Glas plans to work up a next-generation product to add solar controlling properties to the coating to help reflect heat.An estimated 250  million birds in Europe die by flying into glazing in homes and office blocks. Among the various research bodies, estimated numbers are quite remarkable. The commonly quoted toll is estimated to be from 300 million to I billion birds that die each year from collisions with glass on buildings, ranging from skyscrapers to homes. Even if a collision temporarily stuns a bird that soon flies off, scientists say that many times these birds die later from internal bleeding or hematomas, especially on the brain. © 2012 Phys.Org (Phys.org) — A special type of glass that can prevent birds from flying into it has been put to use in the UK at a lookout tower off the north-east coast of England. The special bird stopping glass was developed by a German company and is inspired by nature’s own spiders and the webs they weave—in particular, the orb-weaver spider. The lookout tower at Lindisfarne has installed the special glass to protect the hundreds of species that flock to the island. The human population witnesses a massive increase in bird population at certain times of the year. Authorities wanted to do something to avert the dangers of birds flying into glass. Bird-friendly glass looks like spider web to birds Explore further Citation: Birds can see web-inspired Ornilux glass (2012, August 13) retrieved 18 August 2019 from https://phys.org/news/2012-08-birds-web-inspired-ornilux-glass.html More information: www.ornilux.com/last_img read more

Horsetail spores found able to walk and jump w Video

first_img Citation: Horsetail spores found able to ‘walk’ and ‘jump’ (w/ Video) (2013, September 11) retrieved 18 August 2019 from https://phys.org/news/2013-09-horsetail-spores-video.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. Researchers reveal which London Underground lines are mouldiest More information: The walk and jump of Equisetum spores, Published 11 September 2013 DOI: 10.1098/rspb.2013.1465AbstractEquisetum plants (horsetails) reproduce by producing tiny spherical spores that are typically 50 µm in diameter. The spores have four elaters, which are flexible ribbon-like appendages that are initially wrapped around the main spore body and that deploy upon drying or fold back in humid air. If elaters are believed to help dispersal, the exact mechanism for spore motion remains unclear in the literature. In this manuscript, we present observations of the ‘walks’ and ‘jumps’ of Equisetum spores, which are novel types of spore locomotion mechanisms compared to the ones of other spores. Walks are driven by humidity cycles, each cycle inducing a small step in a random direction. The dispersal range from the walk is limited, but the walk provides key steps to either exit the sporangium or to reorient and refold. Jumps occur when the spores suddenly thrust themselves after being tightly folded. They result in a very efficient dispersal: even spores jumping from the ground can catch the wind again, whereas non-jumping spores stay on the ground. The understanding of these movements, which are solely driven by humidity variations, conveys biomimetic inspiration for a new class of self-propelled objects. Prior to this new research, it was known that the spores produced by horsetail plants (their method of reproduction) moved some distance from the plant that created it. Some accounts even suggested that the spores walked along the ground after being released by the plant. Intrigued by such stories, the researchers with this new effort decided to take a closer look.To find out what was really going on with the microscopic spores, the researchers put them under a microscope and filmed (using a high-speed camera) what they found. The spores, they saw, which have a central bulb surrounded by four independent elaters, are heavily impacted by the amount of moisture in the air. During times of high humidity, the elaters curl up, much like human hair—when the air dries out, so too do the elaters, allowing the curls to relax. It was this curling and relaxing that caused the spores to move in their environment—as the elaters unfurled against the ground, it caused the entire spore to move. More intriguingly, they found that on some occasions, the elaters uncurled so fast that it caused the entire spore to be pushed up into the air. Such jumps, the researchers noted, sometimes reached heights of centimeters—more than enough to allow the spore to leap into passing air currents, carrying them to a far flung locale.The researchers also uncovered the mechanism behind the curling—the elaters are made of two different types of materials—one hard layer and one soft layer. The discrepancy between the ability of the two layers to absorb moisture causes the curling and uncurling. Explore furthercenter_img (Phys.org) —A trio of researches working at University Grenoble in France has discovered that spores produced by horsetail plants are able to move around using “legs” known as elaters. In their paper published in Proceedings of the Royal Society B, the researchers describe the types of movement exhibited by the spores when subjected to changing humidity conditions. © 2013 Phys.org This video shows the walk and jump of Equisetum spores. Because of the simplicity of the mode of transport for the horsetail spore, the research team is now looking into ways that man-made objects might be made to move in the same ways. They envision self-spreading seeder devices or tiny probes that move themselves around crops testing for moisture or fertilizer levels. Journal information: Proceedings of the Royal Society Blast_img read more

Museum workers pronounce dobsonfly found in China largest aquatic insect

first_img © 2014 Phys.org The dobsonfly is noteworthy among wildlife specialists and ecologists because of its preference for very clean water—high or low pH levels drive them away, as do many pollutants. Thus, they can be used as a natural measurement tool for water cleanliness in certain areas. Explore further Citation: Museum workers pronounce dobsonfly found in China, largest aquatic insect (2014, July 23) retrieved 18 August 2019 from https://phys.org/news/2014-07-museum-workers-pronounce-dobsonfly-china.html The dobsonfly is common (there are over 220 species of them) in China, India, Africa, South America and some other parts of Asia, but until now, no specimens as large as those recently found in China have been known. The largest specimens in the found group had a wingspan of 21 centimeters, making it large enough to cover the entire face of a human adult. Locals don’t have to worry too much about injury from the insects, however, as officials from the museum report that larger males’ mandibles are so huge in proportion to their bodies that they are relatively weak—incapable of piercing human skin. They can kick up a stink, however, as they are able to spray an offensive odor when threatened.Also, despite the fact that they look an awful lot like dragonflies, they are more closely related to fishflies. The long mandibles, though scary looking to humans, are actually used for mating—males use them to show off for females, and to hold them still during copulation. Interestingly, while their large wings (commonly twice their body length) make for great flying, they only make use of them for about a week—the rest of their time alive as adults is spent hiding under rocks or moving around on or under the water. That means that they are rarely seen as adults, which for most people is probably a good thing as the giants found in China would probably present a frightening sight. They are much better known during their long larval stage when they are used as bait by fishermen. A master of disguise: A new stick insect species from China Workers with the Insect Museum of West China, who were recently given several very large dragon-fly looking insects, with long teeth, by locals in a part of Sichuan, have declared it, a giant dobsonfly the largest known aquatic insect in the world alive today. The find displaces the previous record holder, the South American helicopter damselfly, by just two centimeters. Credit: Insect Museum of West China This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Kodiak bears found to switch to eating elderberries instead of salmon as

first_img © 2017 Phys.org Kodiak bears track salmon runs in Alaska , Ecosystems , Nature 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. The Kodiak Archipelago is a group of islands off the southern coast of Alaska. It is home to what are known as Kodiak bears—very large brown bears distantly related to polar bears. The bears have become famous due to pictures of them catching salmon in shallow rivers. The archipelago is also home to elderberries, which are also eaten by Kodiak bears. But the researchers with this new effort have found that the feeding habits of the bears are changing due to a warming climate.To learn more about how the bears are adapting to changing temperatures, the researchers used time-lapse cameras to capture the bears feeding on salmon, placed GPS collars on 36 of the females and then tracked them, conducted aerial surveys and studied bear droppings. The researchers discovered that the bears are increasingly faced with whether to eat salmon or elderberries because the berries are ripening earlier, causing an overlap with salmon spawning.In the past, the researchers note, salmon spawning typically occurred around the end of July each year, while elderberries typically ripened in late August. The bears would wade into shallow rivers and grab the spawning salmon and eat them (or just their eggs) on the shore. Then, a month later, the berries would ripen, and they would start eating those. But over the past few decades, there has been a change—elderberries have begun to ripen earlier, sometimes as early as late July. This means the bears are faced with a choice: continue to feast on the salmon or switch to eating the berries. The decision by the bears is obvious, the team reports—when the berries ripen early, the bears completely abandon the rivers and feast almost exclusively on the elderberries.It is not clear at this time how the switch will impact the bears, the salmon or other creatures that normally feed on fish carcasses abandoned by the bears. More information: William W. Deacy et al. Phenological synchronization disrupts trophic interactions between Kodiak brown bears and salmon, Proceedings of the National Academy of Sciences (2017). DOI: 10.1073/pnas.1705248114AbstractClimate change is altering the seasonal timing of life cycle events in organisms across the planet, but the magnitude of change often varies among taxa [Thackeray SJ, et al. (2016) Nature 535:241–245]. This can cause the temporal relationships among species to change, altering the strength of interaction. A large body of work has explored what happens when coevolved species shift out of sync, but virtually no studies have documented the effects of climate-induced synchronization, which could remove temporal barriers between species and create novel interactions. We explored how a predator, the Kodiak brown bear (Ursus arctos middendorffi), responded to asymmetric phenological shifts between its primary trophic resources, sockeye salmon (Oncorhynchus nerka) and red elderberry (Sambucus racemosa). In years with anomalously high spring air temperatures, elderberry fruited several weeks earlier and became available during the period when salmon spawned in tributary streams. Bears departed salmon spawning streams, where they typically kill 25–75% of the salmon [Quinn TP, Cunningham CJ, Wirsing AJ (2016) Oecologia 183:415–429], to forage on berries on adjacent hillsides. This prey switching behavior attenuated an iconic predator–prey interaction and likely altered the many ecological functions that result from bears foraging on salmon [Helfield JM, Naiman RJ (2006) Ecosystems 9:167–180]. We document how climate-induced shifts in resource phenology can alter food webs through a mechanism other than trophic mismatch. The current emphasis on singular consumer-resource interactions fails to capture how climate-altered phenologies reschedule resource availability and alter how energy flows through ecosystems.Press release Explore further Journal information: Proceedings of the National Academy of Sciences Brown bear mother and cub. Credit: Lisa Hupp (photographer) Citation: Kodiak bears found to switch to eating elderberries instead of salmon as climate changes (2017, August 22) retrieved 18 August 2019 from https://phys.org/news/2017-08-kodiak-elderberries-salmon-climate.html (Phys.org)—A team of researchers affiliated with several institutions in the U.S. has found that warming in Alaska has sometimes caused the Kodiak bear to switch to eating elderberries during salmon spawning periods instead of eating salmon. In their paper published in Proceedings of the National Academy of Sciences, the group describes their multi-pronged study of the impact that seasonal changes occurring on the Kodiak Archipelago are having on the bears that live there. , Oecologialast_img read more

Planetary nebulae reveal kinematics of Messier 87 galaxys outer halo

first_imgAstronomers have carried out a study of almost 300 hundred planetary nebulae in the supergiant elliptical galaxy Messier 87. The new research, published September 27 on the arXiv pre-print repository, reveals essential information about the galaxy’s outer halo and its subcomponents. Citation: Planetary nebulae reveal kinematics of Messier 87 galaxy’s outer halo (2018, October 8) retrieved 18 August 2019 from https://phys.org/news/2018-10-planetary-nebulae-reveal-kinematics-messier.html © 2018 Phys.org 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. Located some 53.5 million light years away in the constellation Virgo, Messier 87, or M87 for short (also designated NGC 4486) is one of the most massive galaxies in the local universe. Its halo extends to a radius of about 650,000 light years. Astronomers are interested in studies of outer halos of local massive galaxies as they may contain the fossil records of the accretions events in form of kinematic substructures. In giant galaxies like M87, planetary nebulae are often used to find such structures, given that they can serve as discrete tracers of kinematic decomposition.Recently, a group of researchers led by Alessia Longobardi of Peking University in Beijing, China, has conducted a kinematics study of planetary nebulae in M87 in order to identify subcomponents of the galaxy’s outermost regions. Their sample includes 298 planetary nebulae.For the research, the astronomers used Gaussian mixture modeling for statistically separating distinct velocity components and identifying the smooth halo component, its unrelaxed substructures, and the intra-cluster planetary nebulae.”The goals of this paper are to identify the PNs [planetary nebulae] in the smooth M87 halo, using accurate velocities and following the approach of Longobardi et al. (2015a). We work with the sample of 253 PNs M87 halo PNs and the 45 intracluster (IC) PNs, for which line-of-sight velocities (LOSVs) are available with an estimated median velocity accuracy of 4.2 km/s,” the paper reads.The LOSVs of the studied planetary nebulae allowed the researchers to identify subcomponents and to measure the angular momentum content of the main M87 halo. Furthermore, the research resulted in constraining the orbital distribution of the stars at the galaxy’s outermost regions.In particular, the researchers identified several subcomponents: the intracluster planetary nebulae (ICPNs), the “crown” accretion event (in the so-called “crown” substructure), and the smooth M87 halo. The study found that the intracluster stars have a strongly non-Gaussian line-of-sight velocity distribution (LOSVD) with a peak at that velocity, and strong, asymmetric wings. Moreover, the shape of this LOSVD is consistent with that of the galaxies in the Virgo subcluster A, which suggests the ongoing build-up of the Virgo cluster.The researchers also made important conclusions regarding the smooth halo of M87. They assume that this halo steepens beyond the radius of about 195,000 light years and becomes strongly radially anisotropic. The authors of the paper added that the velocity dispersion profile is consistent with the X-ray circular velocity curve at that radius without non-thermal pressure effects. The X-ray circular velocity curve rises steeply outside about 97,500 light years, reaching 700 km/s at 652,000 light years. More information: The kinematics of the outer halo of M87 as mapped by planetary nebulae. arXiv:1809.10708 [astro-ph.GA] arxiv.org/abs/1809.10708 Spatial distribution of the 298 spectroscopically confirmed PNs in the halo of M87, color coded according to their VLOS and their size scaled according to their probability to belong to the smooth halo. The center of M87 is shown by the black circle, and the photometric major axis of the galaxy by the dashed line. Credit: Longobardi et al., 2018. Giant galaxy Messier 87 finally sized uplast_img read more

MV SSL Kolkata still under surveillance

first_imgKolkata: Merchant Vessel SSL Kolkata is still under surveillance on Monday to ensure that the fire does not break out once again insidethe vessel.According to a communiqué, a recce was conducted by the Indian Coast Guard after the fire was doused by the Indian Air Force on Sunday and it was found that smoke was billowing out from the vessel. Though there was no flames, the smoke continued to emanate. As a result, one ICG Dornier was pressed at around 6 pm on Sunday to carry out an assessment.Meanwhile, the Mi-17 of the Indian Air Force continues to hold position in Frazerganj in case there is a requirement to once again carry out an operation to douse flames.It may be recalled that a fire broke out inside the MV SSL Kolkata off the Sagar Island on June 14 and 22 crew members were rescued.last_img read more

How to stay fit during monsoon

first_imgSaravanan Hariram, fitness coach in HealthifyMe, an app that provides health solutions, suggests some great ways to follow a fitness regime and remain fit during the monsoon season. * You usually go for your walk or to the gym at a particular time. Stick to the same time plan for your indoor workouts also. And, dress the same way you do when you go out for a workout. Start with simple warm-up. Do exercise like spot running on the floor for a few minutes. Also Read – ‘Playing Jojo was emotionally exhausting’* Purchase a few simple exercising devices like resistance bands and skipping rope. If you always wanted to buy an indoor cycle or treadmill, this is the right time. It’s a good option, as they can be used again during your next indoor monsoon workout session. * The stairs in your house are superb exercising device themselves. You can simply start doing stair climbing up and down for a few minutes. * Body weight exercises like push-ups, squats and lunges are excellent choices to improve your muscular strength. Also Read – Leslie doing new comedy special with Netflix* Practice yoga. It also helps in reducing respiratory problems that are common during the monsoon season. * If you love to dance, dance like nobody is watching. This is a fun way to enjoy your indoor monsoon workouts. * Household chores are an excellent way to keep yourself fit. Clean out the shelves and cupboards, sweep the entire house, hand wash the clothes and do dish washing.last_img read more

SDMC attaches bank accounts seals properties of defaulters

first_imgIn a major haul against the property tax defaulters, the South Delhi Municipal Corporation (SDMC) has attached the bank accounts and sealed properties of five-star hotels, government colleges, farmhouses, government agencies and other institutions.The SDMC informed that bank accounts of Radisson Blu Hotel in Dwarka, Jamia Hamdard University, Acharya Narendra Dev College and several others were attached and their properties might be auctioned, if the due amount was not paid within a stipulated time.  Also Read – Man arrested for making hoax call at IGI airportThe South Delhi Municipal Corporation also sealed farmhouses in Daulatpur, Kapashera, Mehrauli, Sultanpur, Nangli Sakrawati, Neelwal, Goyla Khurd, Paprawat, Mitraon, Maksundabad, Malikpur, Bijwasan, Ghitorni, Deramandi, Gadaipur, Fatepur Beri, etc.SDMC Commissioner Puneet Kumar Goel said, “The department has given them every opportunity under the Act to liquidate their dues, but due to non-compliance of the assessment orders, assessment and collection department has attached the properties of the farmhouses. One of the top defaulters is Raddison Blu Hotel, which has to pay an outstanding of Rs 4.40 crore. The department has attached all its four bank accounts. Since sufficient balance was not available in these accounts, the property of the hotel has also been attached.” Sources in the department said if the amount is not recovered soon, it would auction the hotel to recover the property tax.SDMC officials informed that several government and semi-government departments and organisations were also among the defaulter list.last_img read more

Immersing in Bhakti Sangeet

first_imgBringing back the spirit of devotional music to the capital, the annual Bhakti Sangeet Festival began in the national Capital on Friday. The three-day festival will bring together eleven singers from different genres of devotional music including Chhannulal Mishra, Anuradha Paudwal, Bhuvanesh Komkali, Harshdeep Kaur and the Warsi brothers.Presented by Sahitya Kala Parishad and Department of Art, Culture and Languages, Delhi government, the festival will treat audiences with bhajans of saints like Kabir, Meera and Soordas to sufiana kalams from Punjab and devotional music in its purest form. Also Read – ‘Playing Jojo was emotionally exhausting'”Be it in any form, devotional music never fails to strike a chord with people who have the quest to connect to the ultimate reality. In a way, devotional music speaks through a universal language. This is why we are easily moved by all forms of it, no matter which language we speak or which culture we adhere to,” veteran Hindustani classical singer Chhannulal Mishra said.The festival will begin with Paudwal’s performance, to be followed by Kabir bhajans by Bhuvanesh Komkali and an evening of qawwali rendition by the popular Warsi brothers – Naseer and Nazeer Ahmad. The second evening will see the soulful renditions of Radha bhajans by Kumud Diwan and Shubha Joshi performing devotional singing from the Abhang and other folk traditions. Also Read – Leslie doing new comedy special with NetflixApart from that, Nitin Sharma will render bhajans of saints Meera and Soordas. The evening will end with popular singer Harshdeep Kaur’s Punjabi Sufi songs.”The sheer variety of devotional music tradition in India is breathtaking. This festival is a unique platform to bring together people from different genres of music and unite them by their love for the devotional music,” Paudwal said. The third day of the festival will see Uday Bhawalkar performing one of the most ancient styles of Hindustani classic music and Shobha Raju’s rendition of Ram bhakti bhajans. The audience will also be treated to Chhannulal Mishra’s recitation from the Ram Charit Manas.The Bhakti Sangeet Festival will be held at Nehru Park, Chanakyapuri, from April 29.last_img read more

Sketching desires

first_imgIt is ongoing in the national Capital till July 2. When passion meets creativity, desires come alive on the canvas. Nona Khanna is a creative colour therapist and a healer whose artworks give people a therapeutic experience. As gold has to undergo a purity test through fire, artist Shoma Mukherjee depicts women in the purest form, as they walk through the various stages of life. Whereas, artist Riddhima Saraf having trained under Rameshwar Broota, expresses women in a state of utopia and artist Pragati Gupta shows the street life hustle bustle of urban living.  Also Read – ‘Playing Jojo was emotionally exhausting’From daily routine of people on streets, to women and men expressing their desires, have been portrayed compellingly on canvas, by various artists depicting their innermost thoughts. One of the artists, Vijay Sawhney has taken a step further by depicting the cosmos from his imagination.When: June 25 – July 2 Where: ITC Sheraton, Saket Timings: 10:00am – 08:00pmlast_img read more