Citation: Researchers use parkour athletes to test energy demands of tree dwelling apes (2016, November 23) retrieved 18 August 2019 from https://phys.org/news/2016-11-parkour-athletes-energy-demands-tree.html (Phys.org)—A team of researchers with the Universities of Roehampton and Birmingham in the U.K. has found a unique way to measure the energy spent by tree-dwelling apes when faced with gaps in a jungle canopy. In their paper published in the journal Biology Letters, the team describes how they created an artificial canopy and enlisted the assistance of parkour athletes to find out how the different approaches to dealing with canopy gaps compared. 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 Living in the trees can sometimes require the expenditure of enormous amounts of energy, particularly when attempting to move between trees when there is a gap. An ape, such as an orangutan, must size up the situation and make a decision—try to jump, to swing across, or climb down to the ground and then climb up the other tree. Factors at play include the gap distance, fear of falling, estimated strength of the branches and the size of the ape. The researchers wondered if energy expenditure might also play a role—after all, the more energy an ape uses in getting around, the more food it must obtain and consume.Figuring that it was likely impossible to measure the amount of energy being used by real apes in their natural environment the researchers looked for a viable substitute and found parkour athletes.Parkour athletes are people who engage in moving around in urban environments without using any equipment—they jump from building to building, climb walls and do whatever comes to them as they attempt to get from one place to another. Similar in many respects, the researchers noted, to the behavior of apes up in the trees.To test the energy requirements of dealing with canopy gaps the researchers created artificial tree branches from fiberglass poles and vines using ropes and ladders. They then fitted each of 28 athletes with a mask that allowed for monitoring oxygen intake—a measure of energy use. The researchers than had the athletes engage in a variety of activities meant to simulate the various actions an ape might take when faced with a gap.In studying the data, the researchers found that climbing down and back up consumed the most energy by far—the energy requirements for jumping or swinging, on the other hand, were much more complicated. It depended on how stiff the branches were, the distance of the gap, number of sways needed and how big the athletes were.The findings by the team offer some possible explanations regarding why some apes spend more time on the ground than others and perhaps why human ancestors abandoned tree-dwelling altogether. Urban athletes show that for orangutans, it pays to sway More information: Lewis G. Halsey et al. Bridging the gap: parkour athletes provide new insights into locomotion energetics of arboreal apes, Biology Letters (2016). DOI: 10.1098/rsbl.2016.0608AbstractThe tree canopy is an energetically challenging environment to traverse. Along with compliant vegetation, gaps in the canopy can prove energetically costly if they force a route-extending detour. Arboreal apes exhibit diverse locomotion strategies, including for gap crossing. Which one they employ in any given scenario may be influenced by the energy costs to do so, which are affected by the details of the immediate environment in combination with their body size. Measuring energetics of arboreal apes is not tractable; thus our knowledge in this area is limited. We devised a novel, custom-made experimental set-up to record the energy expenditure of parkour athletes tree-swaying, jumping and vertical climbing. The latter strategy was vastly more expensive, indicating that when energy economy is the focus arboreal apes will prioritize routes that limit height changes. Whether tree-swaying or jumping was most economical for the athletes depended upon interactions between tree stiffness, the distance to cross, number of tree-sways required and their own mass. Updated analysis of previous interspecific correlations suggests that whether the relative costs to vertical climb are size-invariant across primate species is complicated by details of the climbing context. © 2016 Phys.org Journal information: Biology Letters Horizontal jumping (a); pole swaying (b); climbing a ladder (c) and a rope (d). Photographs by Lewis Halsey. Credit: Biology Letters (2016). DOI: 10.1098/rsbl.2016.0608
Blazars are members of a larger group of active galaxies that host active galactic nuclei (AGN). They are powerful sources of emission across the electromagnetic spectrum from radio to very high-energy gamma frequencies. Their characteristic features are relativistic jets pointed almost exactly toward the Earth.Located some 900 million light years from the Earth, BL Lacertae is the prototype of the BL Lac objects—a type of blazar showcasing lower power jets and higher Doppler factors than other blazars. BL Lacertae is known for its complicated, long-term behavior and previous studies suggested that it shows quasi-periodic variability in optical and high-energy gamma-ray bands.The first detection of VHE gamma-rays from BL Lacertae was made in 1998, and to date, few gamma-ray flares has been observed from this blazar. Now, a team of over 100 astronomers led by Victor A. Acciari of the University of La Laguna, Spain, reports the finding of another flare from BL Lacertae, exhibiting fast variability of gamma-ray flux. The new flaring event was detected on June 15, 2015 by the MAGIC system.”The MAGIC telescopes detected a fast very high-energy (VHE, E > 100 GeV) γ-ray flare from BL Lacertae on June 15, 2015. (…) In this paper, we present the MAGIC VHE γ-ray data together with multiwavelength data from radio, optical, X-rays, and HE γ rays from 2015 May 1 to July 31,” the researchers wrote in the paper.According to the study, the June 2015 flare had an energy of over 100 GeV, a maximum flux of approximately 1.5 x 10-10 photons/cm2/s and halving time of about 26 minutes. The astronomers added that the multiwavelength behavior of BL Lacertae observed with MAGIC and other telescopes during the three months (May to July 2015) was rather similar to the behavior typically observed in this source during high flux states.The researchers noted that The fast VHE gamma-ray flare was not accompanied by a significant brightening in gamma-ray, X-ray or optical bands. This conclusion is based on the observations of the blazar from the same day in all of these bands. Trying to explain the fast variability of VHE gamma-ray flux in BL Lacertae, the scientists tested three models, but they were unable to choose the most plausible one.”The interaction model is preferred, as it matches the observed repeating multi-wavelength patterns best, but in our simple blob-in-blob model it gives the worst description of the γ-ray band data,” the paper reads.Therefore, Acciari and colleagues suggest further observations of BL Lacertae during VHE gamma-ray flares with strictly simultaneous optical and X-ray high cadence data, as well as intense long-term monitoring of this blazar, regardless of its VHE gamma-ray state. Daily light curve of the VHE γ-ray emission from BL Lacertae above 200 GeV between June 15 and 28. 2015. Credit: Acciari et al., 2019. © 2019 Science X Network More information: MAGIC Collaboration. A Fast Very High Energy γ-ray Flare from BL Lacertae during a Period of Multiwavelength activity in June 2015. arXiv:1901.01733 [astro-ph.HE]. arxiv.org/abs/1901.01733 Luminous gamma-ray flare detected from the blazar DA 193 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 Using Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes, an international group of astronomers has detected a fast, very high-energy (VHE) flare from the blazar BL Lacertae. The finding is detailed in a paper published January 7 on the arXiv pre-print repository. Citation: Fast, very high-energy gamma-ray flare detected from the blazar BL Lacertae (2019, January 16) retrieved 18 August 2019 from https://phys.org/news/2019-01-fast-high-energy-gamma-ray-flare-blazar.html
French by nationality but an Indian at heart after spending 18 years in India, Magali Couffon de Trevros has a deep rooted connection with both countries. She has been able to develop and grow her passion for photography and travels. The ultimate for her is the ability of finding beauty everywhere and keeping her eyes open for colors, shapes, lines, textures and forms. And the Capital will have a chance to see her creativity up close in the Tribal Lights. Also Read – ‘Playing Jojo was emotionally exhausting”Tribal Lights have been created and curated for the Alliance Francaise de Delhi the past few months. The images are of Orissa tribals. They simply show faces of Orissa. I traveled there about a year and a half ago… My imagination was wild as I imagined the adventure: tribes, naxalites, music, dances… I could not ask for more,’ explains Magali.She tries to use her camera as a creative tool not only to document or show what is in front of her but to enhance it with the help of light and sometimes with paint or sculptors. This exercise can be tricky and not always successful but what is important is to have fun. She experiences depth of the knowledge from these experiments.DETAILWhen: 19th April – 11th May (11am – 7pm)Where: Gallerie Romain Rolland, Alliance Française De Delhi, Lodi Estate
The run up to the 100th year of cinema showed us glimpes of cinematic excellence in a year long celebration. Weaving together the memories of one full century, from the first silent feature length film Raja Harishchandra till date, comes the centenary film festival by the ministry of information and broadcasting from 25 April.Celebrating a century: An audio visual voyage exhibition, will mark the beginning of the six day long event. It will be inaugrated by the Minister of Information and Broadcasting, Manish Tewari. The first day shall feature a unique screening of a silent film Also Read – ‘Playing Jojo was emotionally exhausting’Throw of Dice, coupled with live musical orchestra by maestro Nishat Khan. The itinenary for the next 5 days is something to relish upon for the cinema lovers. From tributes to extraordinary talents, screenings of classics and contemporary Indian films and the flavours of Indian cinema along with live interactions with eminent filmmakers, the festival will have a rollicking mix of it all. Satiated? There’s still more to it.A special display of artwork on the iconic filmmaker Satyajit Ray shall take you onto to a nostlagic trip down the memory lane. Besides, you may like to head to Cut-Uncut, a three day workshop showcasing the growth and evolution of censorship in Indian cinema, through insightful panel discussions. Panel discussions shall revolve around the themes: Depiction of women in Indian cinema and Celebrating 100 years of Indian cinema- The Road Ahead. The young and well known producers like Anurag Kashyap, Zoya Akhtar will be engaging with veterans like Sudhir Mishra and Dhritiman Chatterjee to bring up a lively discourse around the set themes. Also Read – Leslie doing new comedy special with NetflixCommemorating Indian cinema in all its glory, the festival would end on a high point with a play on the life and times of Dadasaheb Phalke by Aamir Raza Hussain. Film lovers in the capital will have more than one venue to experience the odyssey of Indian cinema. In its effort to reach out to maximum cinephiles, the festival is being celebrated not just at Siri Fort auditorium but other venues, including Jamia Millia Islamia University, Jawaharlal Nehru University and India Habitat Center, as well. A separate lineup of films shall be screened in the other venues. Lap up till it lasts, for this shall come only once in a 100 years.The festivities and fanfare shall come to a culmination in the National Film Award ceremony at Vigyan Bhavan on 3 May where the prestigious Dada Saheb Phalke Award will be conferred by the Hon’ble President of India.DETAILWhen: 25 to 30 April Where: Siri Fort Auditorium
Kolkata: The Government Railway Police (GRP) of Sealdah division arrested five Chinese nationals from Kolkata railway station on Friday night and seized narcotics worth around Rs 40 crore from them. The state Criminal Investigation Department (CID) has taken up the investigation of the case.The sleuths from Sealdah GRP recovered 197 kg of amphetamine, a synthetic drug that provides a feeling of euphoria. “The raid was conducted on the basis of a credible source information. These people were carrying six bags, all stuffed with foil packages containing the tablets,” said Asesh Biswas, superintendent of railway police, Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedSealdah GRP.The arrested people, agedbetween 30 and 37 years of age, have been identified as Wang Zio Dong, Zeu Gong Hue, Chang Heu, Lee Chand and Lue Bouk Seoung. The tablets were concealed by foils that were kept in different compartments inside the bags.The sleuths have found from their passports that they had visited India in 2017 and 2016 as well. “Drug trafficking appears to be their profession,” a senior GRP official said.Police are facing problems to communicate with them due to the language barrier. “However, prima facie it seems that the consignment was not headed for the city and was supposed to be transported to Delhi or Mumbai,” the official added. Also Read – Naihati: 10 councillors return to TMC from BJPAll the five were produced in Alipore court on Saturday and have been remanded to 14-day police custody. This narcotic is widely used as a party drug in parts of China and South East Asian nations.Meanwhile, the zonal unit of Narcotics Control Bureau on Friday night seized 35 LSD blots (total 0.4 gm) and 7 gm of MDMA (Ecstacy pills) from the possession of one Mubbasir Annan.According to NCB, Annan, who is a resident of Bhowanipore, was supplying these drugs with another associate of Kolkata (presently in Bengaluru for his college studies) to locals. The seized drugs were sourced from Bengaluru. The arrested person used to supply these drugs and cocaine to college youth in Bhwanipore and its adjacent areas. Cost of the seized drugs is about Rs1.5 lakh.
Over the years, IHGF has played a vital role in promoting India’s handcrafted products internationally. “A major highlight of this edition of the show is EPCH’s initiative to promote different craft clusters such as Narsapur, Bhuj, Bareilly, Lucknow and J&K”, informed Rakesh Kumar, Executive Director of EPCH.The handmade crochet lace industry of Narsapur in Andhra Pradesh is famous worldwide for its over 300 intricate designs made by the lace makers of this region. A number of Narsapur based exporters are engaged in
Exercising for at least 150 minutes every week may improve mobility and quality of life in people with Parkinson’s disease, a new study claims.Parkinson’s disease (PD) is a progressive condition that often results in mobility impairments and can lead to decreased health-related quality of life (HRQL) and death.There is evidence that physical activity can delay decline in PD patients.Researchers determined that that people who exercised regularly had significantly slower declines in HRQL and mobility over a two-year period. Also Read – Add new books to your shelf”We found that people with Parkinson’s disease who maintained exercise 150 minutes per week had a smaller decline in quality of life and mobility over two years compared to people who did not exercise or exercised less,” said lead investigator Miriam R Rafferty, from Northwestern University in the US.”The smaller decline was significant for people who started the study as regular exercisers, as well as for people who started to exercise 150 minutes per week after their first study-related visit,” said Rafferty. Also Read – Over 2 hours screen time daily will make your kids impulsiveIn the study, more than 3,400 participants provided data over two years, with infromation collected during at least three clinic visits.Although this study did not determine which type of exercise is best, it suggests that any type of exercise done with a “dose” of at least 150 minutes per week is better than not exercising.”People with PD should feel empowered to find the type of exercise they enjoy, even those with more advanced symptoms,” said Rafferty.The study was published in the Journal of Parkinson’s Disease.
Failing to sleep less than six hours may nearly double the risk of death in people with metabolic syndrome – a combination of diabetes, high blood pressure and obesity, researchers have warned. A study found that people with metabolic syndrome who slept for more than six hours were about 1.49 times more likely to die of stroke. Conversely, those who slept less than six hours were about 2.1 times more likely to die of heart disease or stroke. For those who got more sleep, the risk of death was more modest, the researchers said. The short sleepers with metabolic syndrome were also 1.99 times more likely to die from any cause compared to those without metabolic syndrome. “If you have several heart disease risk factors, taking care of your sleep and consulting with a clinician if you have insufficient sleep is important if you want to lower your risk of death from heart disease or stroke,” said lead author Julio Fernandez-Mendoza, Assistant Professor at the University of Pennsylvania. For the study, published in the Journal of the American Heart Association, the team selected 1,344 adults (average age 49 years, 42 per cent male) who agreed to spend one night in a sleep laboratory. The results showed that 39.2 per cent of the participants had at least three of the risk factors — body mass index (BMI) higher than 30 and elevated total cholesterol, blood pressure, fasting blood sugar and triglyceride levels. During an average follow-up of 16.6 years, 22 per cent of the participants died. “Future clinical trials are needed to determine whether lengthening sleep, in combination with lowering blood pressure and glucose, improves the prognosis of people with the metabolic syndrome,” Fernandez-Mendoza said.
Kolkata: Seven accused persons in a gang-rape case have been convicted and sentenced to 20 years of rigorous imprisonment by the Bankura District Court. The incident took place about one year ago. Another accused, who is a minor, is undergoing trial in the juvenile court. According to a source, on February 1, 2017, on the day of Saraswati Puja, a Class-XII student went out with his friend on a scooter. When they were coming back home, through Gorabazar area, some goons blocked their way and forced the victim’s friend to stop his scooter. The accused persons allegedly tied the youth to a tree and allegedly gang-raped the girl. Later, they fled from the spot. The victim’s friend informed her family members.
Ever since the PSY’s hit number ‘Gangnam Style’ went viral, Indian music lovers have been keeping track of the latest Korean music and dance forms. This has resulted in its widespread popularity – K-pop being one of the most accepted ones. People across the country not only listen to K-pop music but also prove their passion towards this genre.Taking this craze for Korean music into consideration, LG K-pop India contest 2019 was organised where over 1952 teams participated. The finale of the same was held in the Capital recently. Also Read – Add new books to your shelfAmongst the participating artists from across the country, ‘Lokalz Crew’ from Delhi and ‘Harini Nittala’ from Hyderabad bagged the winning title, and are all set to compete at the international stage – ‘Changwon K-pop World Festival 2019’ later this year. The contest, which attracted a large number of audience from all over India, also saw spectacular live performances by the popular band ‘IN2IT’ along with the talented solo artist Alexa. The band of seven boys, which debuted in 2017, had come to India earlier in April this year, and danced to the rhythm of peppy Bollywood music numbers. Also Read – Over 2 hours screen time daily will make your kids impulsiveMillennium Post interacted with the international celebrity artists, and here are few excerpts: How they started their career in K-pop IN2IT: We all met in 2016 at a Korean show, where all of us were competing against each other. But to our surprise, by the end of the show, we became a group. ALEXA: I started dancing when I was only two, and later participated in a competition at the age of 13. It was then that I realised my passion and love for dancing. And since then, I have been performing in different stage shows. How are Bollywood and K-pop interlinked IN2IT: We feel Bollywood songs are very energetic and watching Bollywood music videos is totally different from performing on it. It requires a lot of energy. Recently, we watched the song ‘Ankh Marey’ from Simmba movie and we would love to try our hands on it too. Alexa: It’s good to be back again in India. I always find Bollywood very interesting, colourful and bright, and that’s the reason I feel connected to it. Talking about K-pop as a dance form, IN2IT said that the most impressive feature about K-pop is that artists are regarded as an idol in this culture. Also, K-pop, which was only followed by youngsters, now is also getting popular amongst the elders. “Initially, K-pop was more influenced by the music industry of Japan or America, but over the years, Koreans added more of their fashion and efforts to it.” Speaking about the future of K-pop in India, IN2IT said, “There will be more Indian K-pop artists performing across the world.” “In near future, relations between India and Korea will also improve thereby providing more opportunities to us,” they added.