Dark matter could provide heat for starless planets

Dark matter could provide heat for starless planets

first_img Explore further Citation: Dark matter could provide heat for starless planets (2011, April 1) retrieved 18 August 2019 from https://phys.org/news/2011-04-dark-starless-planets.html © 2010 PhysOrg.com Dark matter: Physicists may have found piece of the puzzle While no one knows exactly what dark matter is, it is believed to make up about 83 percent of the universe. The most accepted theory is this dark matter is made up of what are called WIMPs, or weakly interacting massive particles.These WIMPs interact with regular matter by a weak nuclear force and gravity, but they are also antiparticles. When two WIMPs come together, they work to annihilate each other and cause a burst of energy.Hooper and Steffen suggest that should this dark matter be trapped within a planet’s gravity, the bursts of energy could produce enough to warm the planet. When it comes to Earth, the energy that could be produced is low, but in areas of space where there are high densities of black matter; Hooper and Steffen believe there is the possibility of finding planets that could be warmed in this way.Within the innermost regions of the Milky Way, density of dark matter is estimated to be hundreds or thousands of times that in our solar system, and it is in these areas that Hooper and Steffen believe finding a planet heated by dark matter would be most plausible.Traditional planets, heated by stars like our sun, are dependent on the life of that star. This theory would make these dark matter planets have a large advantage over those tied to a star, as the dark matter could provide heat for trillions of years.Hooper and Steffen admit that they currently do not see a way of detecting any of these possible dark matter planets in the near future, but that in theory, it is possible.center_img More information: Dark Matter And The Habitability of Planets, Dan Hooper, Jason H. Steffen, arXiv:1103.5086v1 [astro-ph.EP] arxiv.org/abs/1103.5086 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. (PhysOrg.com) — In a recent paper posted at arXiv.org and submitted to Astrophysical Journal, Dan Hooper and Jason Steffen, physicists at Fermilab in Illinois, present the theory that cold and dark planets, not heated by a star, could be heated by dark matter. In theory, this dark matter could produce habitable planets outside of what is known as a habitable zone.last_img read more

Engineers introduce beans to cool and then maintain hot beverage temps

Engineers introduce beans to cool and then maintain hot beverage temps

first_img Explore further More information: www.joulies.com/ The Dave’s as they’re called, won’t let on what exactly is inside the beans, but they claim its safe enough to ingest. They refer to it as a “non-toxic phase change material.” The outer cover is all stainless steel, which they say is the same grade as that used for cutlery, which they point out, has a very long safety record as a means for both the drinking of hot beverages and for stirring them. Citation: Engineers introduce ‘beans’ to cool and then maintain hot beverage temps (2011, May 3) retrieved 18 August 2019 from https://phys.org/news/2011-05-beans-cool-hot-beverage-temps.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. © 2010 PhysOrg.com Genes involved in coffee quality have been identified Coffee Joulies cool your coffee to a drinkable temperature in under 90 seconds. A natural question might be to ask if the beans might work for cold beverages as well, as a replacement for ice cubes, but that question has not been addressed thus far. At this point it would seem unlikely as there is no indication that the special ingredient inside the beans would absorb and hold any more of a chill than freezing anything else and dumping it in your cup. At any rate, to use Coffee Joulies, once on the market that is, coffee drinkers would place a few of them in a cup, pour in their hot beverage of choice, wait a moment for the beans to cool, then commence to drinking. Afterwards, the beans could be washed the same way as other stainless steel utensils, though they likely would only need a little rinsing. No word yet on whether the phase-change material inside the beans degrade over time, and if so, how long it might take. (PhysOrg.com) — Buddies and mechanical engineers, Dave Petrillo and Dave Jackson, have, thanks to Kickstart.com, begun a business selling the Coffee Joulie (clearly a play on the word for joule, a unit of energy, and jewel, the stuff you wear as bling), a stainless steel bean they’ve invented that will first cool a hot drink, then maintain it at a consistent 140°F (60° Celsius) temperature for up to five hours if the container is kept closed. Generally used with more than one “bean” at a time, Coffee Joulies have a special secret ingredient inside of them that works first as a heat sink; absorbing heat from the hot coffee or other beverage that surrounds them, until reaching 140F°, at which point the secret ingredient melts causing it to reverse course and to then start working as a heat source as the absorbed heat is radiated back into the beverage as the secret ingredient slowly solidifies once again.last_img read more

Researchers modify harmless bacteria to kill harmful bacteria

first_img Citation: Researchers modify harmless bacteria to kill harmful bacteria (2011, August 17) retrieved 18 August 2019 from https://phys.org/news/2011-08-harmless-bacteria.html Explore further P.aeruginosa is a common microbe that is responsible for difficult to treat infections in people, particularly those with comprised immune systems. It generally colonizes the gastrointestinal tract or the respiratory system and is believed to be responsible for up to ten percent of all hospital acquired infections. The general approach to treating it is massive amounts of antibiotics which don’t always work and also tend to kill off good bacteria in the process.To get around this problem Poh and Chang modified the DNA of E. coli in such a way as to allow it to be able to detect LasR, a molecule used by P.aeruginosa bacteria to communicate with one another. When the LasR is detected, the E. coli begins producing a toxin called pyocin until it’s full, at which point it explodes releasing the pyocin which kills P.aeruginosa by eating holes in its exterior, allowing its innards to pour out.This approach is the first time that bacteria have been used to kill other bacteria and is a step up in the ongoing battle against infectious diseases. It’s one that is of critical importance due to the dearth of new anti-bacterial drugs; only two new ones have come on the market in the last ten years and the old ones are becoming increasingly ineffective as new strains of bacteria have evolved that are resistant to them.The research team says that in the lab, the modified E. coli were able to kill up to 99% of the P.aeruginosa when they were in standalone mode. Perhaps more importantly, they were also able to kill off nearly 90% of them when they were banded together in large communities called biofilms, which are notoriously difficult to treat with conventional methods.The one major obstacle to using such engineered E. coli as a stealth agent, at least at this stage, is its inability to actually hunt for its victim, rather than sit by passively waiting for the right bacterium to pass by before exploding itself. The hope is that other bacteria with sensing abilities could be used instead of E. coli; ones that could actually track down the specific target, perhaps allowing for a kill rate of 100%.The next step in the testing of the new treatment will be introducing the modified E. coli into mice to see if it will work as well in a live animal, and also of course, to see what side effects might occur. (PhysOrg.com) — Researchers in Singapore have modified the DNA of one type of bacterium, Escherichia coli, to first sense the presence of another bacterium, Pseudomonas aeruginosa, and then to explode, releasing a special kind of toxin that will kill it. Chueh Loo Poh and Matthew Wook Chang of Nanyang Technological University in Singapore, describe their research in Molecular Systems Biology. 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.center_img © 2011 PhysOrg.com No hiding place for infecting bacteria More information: Engineering microbes to sense and eradicate Pseudomonas aeruginosa, a human pathogen, Molecular Systems Biology 7 Article number: 521  doi:10.1038/msb.2011.55AbstractSynthetic biology aims to systematically design and construct novel biological systems that address energy, environment, and health issues. Herein, we describe the development of a synthetic genetic system, which comprises quorum sensing, killing, and lysing devices, that enables Escherichia coli to sense and kill a pathogenic Pseudomonas aeruginosa strain through the production and release of pyocin. The sensing, killing, and lysing devices were characterized to elucidate their detection, antimicrobial and pyocin release functionalities, which subsequently aided in the construction of the final system and the verification of its designed behavior. We demonstrated that our engineered E. coli sensed and killed planktonic P. aeruginosa, evidenced by 99% reduction in the viable cells. Moreover, we showed that our engineered E. coli inhibited the formation of P. aeruginosa biofilm by close to 90%, leading to much sparser and thinner biofilm matrices. These results suggest that E. coli carrying our synthetic genetic system may provide a novel synthetic biology-driven antimicrobial strategy that could potentially be applied to fighting P. aeruginosa and other infectious pathogens.last_img read more

Tropical plant rediscovered after 150 years

Tropical plant rediscovered after 150 years

first_img © 2018 Phys.org A small team of researchers with the Crop Research Institute and Palacký University, both in the Czech Republic, has rediscovered a plant first (and last) recorded over a century and a half ago. In their paper published in the journal Phytotaxa describing their find, Michal Sochor, Zuzana Egertova, Michal Hrones and Martin Dancak describe the plant, a mycoheterotroph called Thismia neptunis. An orchid that never blooms More information: MICHAL SOCHOR et al. Rediscovery of Thismia neptunis (Thismiaceae) after 151 years, Phytotaxa (2018). DOI: 10.11646/phytotaxa.340.1.5 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. T. neptunis was first discovered back in 1866 by botanist Odoardo Beccari. He drew pictures of it in his notebook. The plant was not seen by other researchers until the team from the Czech Republic came across it last year, and took what are believed to be the only pictures of it ever captured.The plant, the team reports, is small, with a flower just 9 centimeters across. It grows in wet dirt along a river in a rainforest in Matang Massif, Borneo. It is also a member of the mycoheterotrophic family, which means it is not capable of photosynthesis, but instead survives as a parasite. It has no leaves, but its flower is unique, shaped like a bulb with three antennae-looking appendages that stick straight up into the air. The bulb itself is described as pale-colored with red stripes and an opening on top. The bulb is suspended on a whitish smooth stem. The plant’s features are similar to others in the genus Thismia, which collectively have been given the unofficial name of fairy lanterns. The team reports that they found dead flies inside one of the plants, suggesting a means for pollination. They noted also that Beccari did a remarkably good job of capturing what the plant looks like in his drawings.Prior research on other mycoheterotrophs has shown that they are tropical plants with more structure underground than above—the flower is, of course, used as a means of reproduction. They survive by absorbing fluids from underground fungi and typically only bloom for a few weeks at a time over the course of a year. They do not always bloom, though, which suggests the find by the Czech team was quite lucky.Beccarri, the researchers note, also discovered two other plant species in the area—they are hoping to rediscover those as well. Explore further Thismia neptunis: flowering plants (A, B), bud (C), detail of flower (D), section of floral tube and outer view of connective tube (E), detail of inner perianth lobe. Credit: Phytotaxa (2018). DOI: 10.11646/phytotaxa.340.1.5 Citation: Tropical plant rediscovered after 150 years (2018, March 6) retrieved 18 August 2019 from https://phys.org/news/2018-03-tropical-rediscovered-years.htmllast_img read more

What the 10Year Challenge Might Say About You and Me

first_imgI didn’t mind the white lies, but I also felt like something of an impostor. Nothing in my post mentioned my Botox injections, my regular use of Retin-A and vitamin C serum. Nor did it note the major life transitions I’d navigated in the past decade: the deaths of my parents, a divorce, the passing of my cocker spaniel, my sister’s cancer diagnosis. Somewhat reluctantly, I gave in and posted my then-and-now photos with the caption: “Okay, okay.” The feedback was fast and fine. “Hunky then, and more so NOW!” “U haven’t aged at all.” “You are positively ageless, not to mention ultra handsome.” “You wear glasses now. That’s the only difference I can see.” It was fun to watch, especially considering how good many of my friends looked. I posted on their feeds. “Ageless!” “Gorgeous X2.” And, “Which is which?” The whole exercise seemed harmless, if a bit self-involved, despite some concerns about privacy. But as the photos and comments continued to pour in, the challenge soon became a barometer of our views about aging, of how we define beauty, even of what it means to live a purposeful life. Earlier this month out of nowhere came the “How Hard Did Aging Hit You Challenge” that flooded Instagram and Facebook. The game, better known as the “10-Year Challenge,” couldn’t have been easier: Simply post two photos side by side — an early profile photo from 2009 next to a recent one — as proof positive of how you’ve aged. Or, in many cases, miraculously not aged. Kevin LaBar, associate director at Duke University’s Center for Cognitive Neuroscience, said that two opposing forces might be at play in motivating someone to join the challenge. One he called “age defying.” Positive call outs would appeal to a person’s “pure vanity, with a superficial, narcissistic, ageist bent.” The other he called “celebrating aging,” or embracing an older self, wrinkles be damned. For those people, comments like “older and wiser” might resonate most. Read the whole story: The New York Timeslast_img read more

The wall for Nobel

The wall for Nobel

first_imgHow well do you know about India’s Nobel Laureates? If you don’t,  the Sweden-India Nobel Memorial Week 2014  is here, especially for you. The Embassy of Sweden commemorates the Indian Nobel Laureates at the Nobel Memorial Wall at the Rajiv Chowk Metro Station, in the capital, from 26 October to 03 November.The Nobel Wall is the Embassy’s initiative to spread awareness and  knowledge about all the Nobel Laureates from India whilst paying a tribute to their contribution to ‘those who, during the preceding year, shall have conferred the greatest benefit on mankind.’ Also Read – ‘Playing Jojo was emotionally exhausting’While last year the Wall celebrated the 100-year anniversary of Rabindranath Tagore’s Nobel Prize in Literature, this year is special with the addition of India’s second Peace Prize Laureate,  Kailash Satyarthi. The wall will showcase  Nobel Laureates Rabindranath Tagore, CV Raman, HarGobind Khurana, Mother Teresa, Subramanyan Chandrashekhar, Amartya Sen, Venkatraman Ramakrishnan and the recent laureate Kailash Satyarthi.When:  26 October – 3 November Where :  Rajiv Chowk Metro Stationlast_img read more

Revival of tourism our govts top priority says Harish Rawat

Revival of tourism our govts top priority says Harish Rawat

first_imgFlagging revival of tourism which was hit hard by 2013 flash floods as his top priority, Chief Minister Harish Rawat on Tuesday said a number of initiatives have been taken by the state government to give the message of a safe Uttarakhand to the outside world so that the tourism industry in the state could be put back on track.”Tourism is the mainstay of our economy. Our efforts are directed towards its revival. Giving the message of a safe Uttarakhand to the outside world is necessary for this. Hence we are focusing as of now on the Char Dham and Mansarovar pilgrimages. Also Read – Need to understand why law graduate’s natural choice is not legal profession: CJI”Once we succeed in achieving our priorities, we will shift our attention to the redressal of?the problems of employees, ” Rawat said addressing the sixth session of technical and field employees association of Uttarakhand Jal Sansthan here.Noting that employees can contribute significantly towards putting tourism and the state’s economy back on track, Rawat asked them to prepare an atmosphere conducive to the state’s rise on the growth trajectory over the next six months.He said the state has not been able to benefit from a number of central schemes due to its incapacity for increased spending.last_img read more

All about women

All about women

first_imgOn the occasion of International Women’s Day, Bharatiya Mahila Bank Limited has organised Hastkala Utsav from March 7 to 15  at Dilli Haat, Janakpuri, in the Capital. Addressing the gathering at the inaugural function Usha Ananthasubramanian, Chariman and Managing Director Bharatiya Mahila Bank Limited said that the objective of the Utsav is to provide a unique platform to women artisans both individuals as well as Self Help Groups (SHGs) to display their talents. The Bank is happy in being part of bringing out the talents of women, she added. The Hastkala Utsav, an exhibition-cum-sale of handicrafts and handloom artifacts, created by women artisans was inaugurated by Lalitha Kumaramangalam, Chairperson National Commission for Women, on March 7.S.M. Swathi, Executive Director, Bharatiya Mahila Bank Limited, said that the Utsav, being organised in collaboration with Consortium of Women Entrepreneurs of India (C.W.E.I) will have about 50 stalls and will help in encouraging Indian Handicrafts. Groups from across the country will be participating in the Utsav.last_img read more

AB de Villiers gives South Africa fighting chance

AB de Villiers gives South Africa fighting chance

first_imgAB de Villiers hit a rapid 64 to lift South Africa to a competitive total of 283 for seven in the series-deciding third and final one-day international against New Zealand on Kingsmead on Wednesday.The South African captain was the only batsman who made batting look easy against a steady New Zealand bowling attack on a pitch which offered the New Zealand bowlers good bounce and some sideways movement.De Villiers hurried to a half-century off 38 balls before being bowled by Doug Bracewell after a 48-ball innings which included eight fours and a six. Also Read – A league of his own!When De Villiers was on 19 he reached 8000 runs in one- day internationals in his 182nd innings – the fastest to the milestone. The previous record was held by Sourav Ganguly of India, who took 200 innings.After a poor batting performance in the second match in Potchefstroom, where they were bowled out for 204, South Africa fulfilled their objective of making a solid start as Morne van Wyk (58) and Hashim Amla (44) put on 89 for the first wicket.But the scoring rate was languishing until De Villiers and David Miller (36) put on 86 off 65 balls for the fourth wicket. Left-arm opening bowler Ben Wheeler took three wickets but conceded 71 runs, while medium-pacer Grant Elliott bowled ten overs in an unbroken spell and took two for 41.last_img read more

Day of Hungarian culture

Day of Hungarian culture

first_imgThe Embassy of Hungary and the Hungarian Information and Cultural Centre in association with the Sree Arts commemorated the Day of Hungarian Culture with a bouquet of events on January 30. It touched the fields of art, music and dance and literature. In the presence of dignitaries and eminent artists, ‘Dreams of the mind’ presented by two contemporary Hungarian artists Csilla Babinszky and Zsuzsa Moizer commenced. The chief guests for the evening included Mr Gyula Petho, Ambassador of Hungary, Dr Alka Pande, Curator and Art Consultant, Visual Arts Gallery and Dr Alka Raghuvanshi, eminent artist, curator and critic with Mr Sandeep Marwah, Mr Vijendra Sharma and Mr Jitendra Padam Jain as the Guests of Honour and Mr Qazi Raghib as the special guest. Also Read – Add new books to your shelfThe two Hungarian contemporary artists Csilla Babinszky and Zsuzsa Moizer applied traditional themes and forms through a unique personal discourse by using a contemporary approach and spirit. Babinszky’s large-scale, mixed technique paper series “Strange Angels” explores the female being in the universal context, inspired by and at the same time questioning the beauty and its major appearance. These collage-like drawings use several instruments like gold gouache and silver graphite, aquarelle, colored pencils, acrylic. She says, “Art for me is connection. Staying connected with the genuine question’s conceptual and visual outcome.” Also Read – Over 2 hours screen time daily will make your kids impulsiveMoizer’s intimate human figures and zoomorphic creatures are exploring the human existence, fragility and evanescence within the natural environment and social context. The new series of water colour paintings are realistic forms of nature towards lyrical compositions, which refers to a subjective landscape instead of a real world. The best approach to her characteristically tender images is probably through the topics of women’s search for identity, and gender roles.last_img read more