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 Zebrafish, unsurprisingly, have striped bodies, reminiscent of zebras. But how does its biology decide to create the stripped patterns, and how does it make it come about? Research by the team in Japan, may be about to provide an answer.Scientists have wondered about how animals get their stripes or spots for years. Are they hard-coded in DNA, the same way that an organism is able to produce an arm or leg, or is there some other mechanism at work? Oddly, Alan Turing, the famous math and computer visionary asked himself this very question back in the 1950’s, and it turns out his theory may turn out to be closer than anyone expected. He came up with a mathematical model that described the interactions between two molecules—one that causes a pattern to appear and one that attempts to stop it. In this new research, it’s not molecules, but whole cells that appear to be doing something similar.To find out what’s going on with the zebrafish’s stripes, the researchers placed a single yellow pigment cell (xanthophore) in a Petri dish and watched it wander around aimlessly. They did the same with a black pigment cell (melanophore) and found it behaved in much the same way. But when they placed both in a Petri dish, they discovered the yellow cell (using finger-like projections) actually chased the black cell around. They noted the black cells were able to move slightly faster, which meant there was a constant game of near catch and run. 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 Computer simulation explains why zebras have stripes PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Citation: Study of zebrafish skin patterns shows cells chasing other cells around (w/ video) (2014, January 21) retrieved 18 August 2019 from https://phys.org/news/2014-01-zebrafish-skin-patterns-cells-video.html 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 © 2014 Phys.org Explore further Play Credit: PNAS, doi/10.1073/pnas.1315416111 Play Credit: PNAS, doi/10.1073/pnas.1315416111 Play Credit: PNAS, doi/10.1073/pnas.1315416111 The researchers can’t prove it, at least not yet, but they suspect the game of catch and run exhibited by the two cells is what results in the stripes seen on a whole fish. If there were hundreds, or thousands of such cells all playing catch and run with each other, they suggest, it’s possible that the end result would be a corralling of the black cells, resulting in a shape that to us looks like long black stripes. 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. More information: “In vitro analysis suggests that difference in cell movement during direct interaction can generate various pigment patterns in vivo,” by Hiroaki Yamanaka and Shigeru Kondo. www.pnas.org/cgi/doi/10.1073/pnas.1315416111 (Phys.org) —A team of researchers at Osaka University in Japan has discovered that one type of zebrafish pigment cell chases another around in a Petri dish possibly explaining how they fish gets its stripes. The team has published its findings in Proceedings of the National Academy of Sciences. Journal information: Proceedings of the National Academy of Sciences Play Credit: PNAS, doi/10.1073/pnas.1315416111 Much more work will have to be done in this area, of course, but for now, it appears possible that some animals at least, get their coloring as the result of physical actions taken by cells, rather than genetic imprinting.
The narwhal tusk has inspired a lot of theories regarding its reason for existing (for use as a weapon, water tester or even as a means of conjuring magic) but thus far, most remain just that because of the lack of study done on the whales in their native environment. In this latest effort the research team set out to learn more about both narwhal and beluga whales, specifically their mating practices, because they would like to better understand how both whales might react to global warming.To learn more about the whales, the researchers obtained data collected between the years 1997 to 2008 by Inuits who are allowed to hunt the whales. The data consisted mainly of measurements, which included the reproductive tracts of every whale caught, and the length and girth of narwhal tusks. In studying the measurements, the team found what appears to be a very clear correlation between testes mass in narwhals, and tusk length—the more massive the testes, the longer the tusk. This, the team claims, indicates that the tusk is used by the males to attract females, or conversely, it’s a sign females use to determine which males will likely be the most fertile.The team also reports that they found no significant differences between narwhal and beluga reproductive tract length for males or females, though the beluga whale had much larger testes relative to body size than narwhals, suggesting that beluga males have more female sexual partners.Thus far the research group doesn’t appear to have found any evidence to suggest how either whale species might respond to global warming (which will mean warming sea temperatures), but they do conclude that because of the different mating strategies used by the whales, they likely will respond differently to climate change. More information: Mating ecology of beluga (Delphinapterus leucas) and narwhal (Monodon monoceros) as estimated by reproductive tract metrics, Marine Mammal Science, 2014. DOI: 10.1111/mms.12165AbstractNarwhal and beluga whales are important species to Arctic ecosystems, including subsistence hunting by Inuit, and little is understood about their mating ecology. Reproductive tract metrics vary across species in relation to mating strategy, and have been used to infer mating ecology. Reproductive tracts from beluga and narwhal were collected between 1997 and 2008 from five beluga stocks and two narwhal stocks across the Canadian Arctic. Tract length for males and females, relative testes mass for males, and tusk length for male narwhal were measured. We assessed variation relative to species, body size, stock, maturity, and season. Significant variation was found in testes mass across month and stock for beluga, and no significant difference between stock or date of harvest for narwhal. Beluga had significantly larger testes relative to body size than narwhal, suggesting they were more promiscuous than narwhal. A significant relationship was found between narwhal tusk length and testes mass, indicating the tusk may be important in female mate choice. No significant differences were found between narwhal and beluga reproductive tract length for males or females. The mating systems suggested for narwhal and belugas by our results mean the two species may respond differently to climate change. Narwhales. Credit: Glenn Williams, public domain Citation: Narwhal tusk length linked to testes mass suggesting its purpose is for attracting females (2014, September 23) retrieved 18 August 2019 from https://phys.org/news/2014-09-narwhal-tusk-length-linked-mass.html Journal information: Marine Mammal Science (Phys.org) —A team of researchers studying narwhal and beluga whales in their native Arctic ecosystem has found what appears to be a correlation between testes mass and tusk length in narwhals—suggesting the horn-like appendage exists as a means for males to attract females. In their paper published in Marine Mammal Science, the team describes how they obtained narwhal anatomy measurements and why they believe the tusk serves mostly as a fertility draw. Explore further Unicorn-like narwhal studied for sensory use of tusks © 2014 Phys.org 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.
(Phys.org)—A small team of researchers at California Institute of Technology has found a way to use visible blue light to induce copper-catalyzed C-N cross-couplings. In their paper published in the journal Science, the team describes the technique and why they believe the work may lead to bigger things. Michael Greaney with the University of Manchester offers a Perspectives piece on the work done by the team in the same journal issue outlining the process and explaining why the use of visible light to effect photochemical transformations has become so important in recent years. More information: Asymmetric copper-catalyzed C-N cross-couplings induced by visible light, Science 12 Feb 2016: Vol. 351, Issue 6274, pp. 681-684, DOI: 10.1126/science.aad8313 , https://sp2.img.hsyaolu.com.cn/wp-shlf1314/2020/IMG8183.jpg” alt=”last_img” />
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Programmable disorder: Random algorithms at the molecular scale Particles self-assemble into these networks, which produce Archimedean tilings when lines are drawn between the particle centers. Credit: Stephen Whitelam “The simplest way of tiling a plane is to cover it with triangles, or with squares, or with hexagons. These patterns are called the Platonic or regular Archimedean tilings. Other authors have shown that particles with certain geometric properties—with sticky patches at certain angles—can spontaneously form the networks that are equivalent to these tilings, meaning that if you draw lines between particle centers, then the picture you get looks like a tiling. “The next simplest way to cover a surface is with combinations of two or three regular polygons, and these patterns are called the semi-regular Archimedean tilings (often just Archimedean tilings). Other researchers have used simulations to show that particles with the correct geometry alone probably can’t self-assemble into such structures. My work confirms this fact, but shows that what does work is if the particle interactions are chemically specific, meaning that the sticky patches only stick to certain other sticky patches. In this way, particles avoid making lots of binding mistakes, and manage to find their way to the correct structure.” Interestingly, chemical selectivity is also used to control the interparticle interactions among biological particles, such as proteins and DNA.”One aspect of this result is already widely known: researchers who use DNA nanotechnology routinely use DNA-mediated chemically specific interactions to make structures as complex or more complex than the Archimedean tilings,” Whitelam said. “What surprised me is 1) that you need this strategy even for the Archimedean tilings (among the most simple regular structures), and 2) that all you need is this strategy (that is, chemical specificity is both ‘necessary and sufficient’). I wanted to emphasize this fact because it did not seem obvious to me that one should need chemical specificity to make the networks equivalent to the Archimedean tilings.”Whitelam expects that the minimal positive design strategy should also work for self-assembling particles into other types of arrangements besides Archimedean tilings. The ability to self-assemble particles into various patterns could provide a tool for fabricating future nanoscale devices. “Researchers would like to be able to control the patterns of molecules on surfaces for several reasons,” Whitelam said. “One is that if you can control what sits on a surface and how it is organized then you can influence the chemical and physical properties of the surface. Another is that networks in two dimensions can be used to ‘host,’ or position, other molecules: imagine putting particles (such as metal nanoparticles, potentially useful in next-generation electronics devices) in the pores of the networks. It is important to be able to control the relative positions of such particles; being able to assemble any of the Archimedean tilings, or indeed any network you desired, would be a good way of doing this.”In the future, Whitelam plans to work with other scientists who come to The Molecular Foundry at Berkeley Lab, which is a US Department of Energy User Facility for nanoscience. “My aim is to build on this work in order to collaborate with Foundry Users—scientists who come to the Foundry to do collaborative nanoscience—who make DNA-linked particles,” he said. “We would like to work out how to design such particles in order to make new nanostructures ‘to order.’ Explore further More information: Stephen Whitelam. “Minimal Positive Design for Self-Assembly of the Archimedean Tilings.” Physical Review Letters. DOI: 10.1103/PhysRevLett.117.228003 Stephen Whitelam, a researcher at the Molecular Foundry at Lawrence Berkeley National Laboratory, has published a paper on the minimal positive design strategy for self-assembling Archimedean tilings in a recent issue of Physical Review Letters.Previously, researchers have successfully self-assembled particles into Platonic tilings, which are simpler arrangements consisting of regular periodic arrays of a single shape, such as squares, triangles, or hexagons. To do this, researchers use a strategy called positive design, in which the desired structure is promoted based on the particle geometry. When the particles are combined and cooled, they spontaneously self-assemble into Platonic tilings due to a variety of underlying chemical, physical, and thermodynamic interactions.Self-assembling particles into the next-simplest arrangement, Archimedean tilings, is much more difficult. Archimedean tilings are composed of two or three different shapes, and only one type of vertex (so if you zoomed in on the intersection points, they would all look the same, having the same angles in the same order). There are eight types of Archimedean tilings, and the new design strategy can construct all eight of them.The novel aspect of the new design strategy is the “minimal” element, which refers to chemical selectivity. Whitelam found that if you identify all of the interparticle interactions involved in a desired arrangement, and then select particles with only those interactions and no others, then under a simple cooling protocol the particles will self-assemble into the desired structure. The “positive” aspect of the strategy is that it works by promoting the desired structure, and does not require suppressing all of the many possible undesired structures.The simulations also showed that, if chemical selectivity is not accounted for, then particles do not self-assemble into the Archimedean tilings, showing that the chemical selectivity is critical to realizing these structures. “The results show that you need ‘chemical specificity’ of interactions to self-assemble certain simple, regular structures,” Whitelam told Phys.org. “I wanted to write a paper about the amount of ‘information’ that you need to ‘program’ into a particle in order to allow it to self-assemble, in the presence of many copies of itself, into a desired structure. (Phys.org)—For the first time, researchers have simulated particles that can spontaneously self-assemble into networks that form geometrical arrangements called Archimedean tilings. The key to realizing these structures is a strategy called minimal positive design, in which both the geometry and the chemical selectivity of the particles is taken into account. The process has applications in molecular self-assembly, which could one day be used to build a variety of nanoscale technologies. © 2016 Phys.org Citation: Particles self-assemble into Archimedean tilings (2016, December 8) retrieved 18 August 2019 from https://phys.org/news/2016-12-particles-self-assemble-archimedean-tilings.html Journal information: Physical Review Letters
Where did the ambition to become an artist come from? Were you always interested in art?I always had interest in sketching and loved playing with colours. So one can say that I was always interested in the arts.What are the themes you prefer to work with?I paint to express my internal feelings. Being a woman I love to work on women-centric or sentimental themes like love etc. What is your medium of choice in art?I have tried water colour and oil colours in the past but I am very comfortable with the acrylic medium. Also Read – ‘Playing Jojo was emotionally exhausting’Tell us a bit about your childhood and initial years. What role did art play in those years?I had a normal childhood. I used to sketch. Art was my favorite pastime. However after my marriage it got stopped for a while as there was hardly any time to do these. Now that the kids are grown up I have again find time to follow my passion in art.What plans for 2013?After this solo show I have few group exhibitions lined up in the latter part of this year. There is a lot to look forward to. How does Delhi feature in your works?Delhi per se does not feature in my work as my paintings are based on themes of love and women specifically. However, it is only after coming in Delhi in 2010 that I decided to become a full time professional painter and there was no looking back.
Shangri-La’s Eros Hotel is celebrated the ninth International Chef’s Day on 20 October 2013 to honour our culinary masters and to recognise the pivotal role chefs play in society.It is also a day for helping young chefs. Most importantly, though it is a day to recognise the very important role that chefs play in our societies because, they have a great responsibility of not feeding people, but also giving nourishment and education. Chefs are responsible for leading the way in using ingredients sensibly and responsibly. The day was planned to salute their culinary spirit and their art of crafting magic for the taste buds. Also Read – ‘Playing Jojo was emotionally exhausting’Under the helm of Executive Chef Darren Conole, the cooking masters geared up to make the day special for guests and society. Not just a brunch and lunch, the day held a cake mixing ceremony in the lobby of Shangri-La’s that brought to life the rich tradition, heralding and unveiling the spirit of the festive season in all its grandeur. Guests rolled up their sleeves and put their hands in the mixing pots to make the perfect Christmas cake. The mixture was placed in airtight bags and left to mature until around Christmas, when it will be blended with the cake batter and baked.After the traditional ceremony, the chefs took a walk to India Gate driving a noble cause of ‘Clean Delhi for a Green Future’ to pick up the trash that mars the beauty of the iconic Delhi landmark.Food, tradition and a keen foresight for the future. What better way to celebrate the power of chefs than this! Head over to Shangri-La to experience a piece of this magic.
Kolkata: A fake doctor was arrested in Sonarpur after the woman he was treating for quite some time fell sick and had to be admitted to a private nursing home.Locals beat him up and handed him over to the police. Rakesh Mondol, the fake doctor, admitted that he only has a diploma in pharmacy, which he obtained after becoming a graduate in Arts.Roma Halder, a resident of Adarshapalli in Sonarpur, was diagnosed with a tumour on the breast. She visited Mondol six months ago and had been under his treatment since then. Mondol was treating her with homeopathic medicines. The problem cropped up when Haldrer felt sick. She complained of acute pain and was taken to Mondol’s chamber. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedMondol administered five bottles of saline on her in two days.Halder’s conditions deteriorated on Tuesday evening after the fifth bottle was administered. She was taken to a private nursing home in Kolkata, after she felt critically ill. Locals became suspicious after Halder was admitted to the hospital.They went to Mondol’s chamber and asked him to show his certificates. Mondol initially refused to furnish his certificates but succumbed to the pressure. Also Read – Naihati: 10 councillors return to TMC from BJPHe confessed that he had given a false registration number on the writing pad, which was used for prescribing medicines.Though he did not have any degree, he picked up treating patients because of his interest in medicine and experience.Locals ransacked his chamber and handed him over to the police. They have demanded exemplary punishment.Halder’s mother said they were deceived by his acting. He is well-behaved and assured to cure her daughter. Initially, Halder showed signs of improvement but gradually deteriorated and finally had to be admittedto a hospital.”The doctor was treating her for the past six months. We could have taken her to a genuine doctor had he confessed to us before. But he went on treating her without any knowledge of treating a tumour,” said Halder’s mother.
Different hotel groups have indulged in the art of producing organic fruits and vegetables within their premises or nearby areas, which can be served to the guests. The pioneer of this practice is The Lalit Hotel (an enterprise of the Bharat Hotels Ltd). Their hotels in different parts of the country, are inculcating this practice with the motto ‘We serve What We Grow’.In God’s own country Kerala, The Lalit Resort & Spa Bekal, has initiated a drive to grow their own herbs, fruits and vegetables. Also Read – ‘Playing Jojo was emotionally exhausting’They proudly own the organic vegetable gardens and they use latest farming technologies. They also grow precious herbs that is used for ayurvedic treatment. Rejuve – The Spa offers ayurvedic massage therapies with honey, fresh Coconut, Sandal powder, Aloevera juice, Turmeric, Lemon grass, pure milk, medicinal rice etc. In Goa, the property which is called The Lalit Golf & Spa Resort, is endowed with lush green gardens and sprawling organic farms, spread over 88-acres. Other than the golf and spa, this resort is also famous for its scrumptious cuisines and freshness of food. Also Read – Leslie doing new comedy special with NetflixTo promote well being, they initiated a drive to grow herbs, fruits and vegetables across their hotels. They proudly say, “We serve what we grow”. The Lalit Golf & Spa Resort Goa also own organic vegetable gardens. They grow different varieties of fruits and vegetables such as coconut, mangoes, cinnamon, lemon grass, papaya, and seasonal vegetables such as chillies, brinjal, rocket leaf lettuce, raddish, okra, red spinach, tomato and pumpkin. There are about 1,250 coconut trees and the same number of mango trees that keeps the area green. A destination of inspiration and calm, The Lalit Temple View Khajuraho, is nestled in the shadow of Khajuraho —a UNESCO world heritage site. Other than the architectural delight and great services, this hotel is also famous for its scrumptious cuisines and freshness of food. The secret of The Lalit’s delectable dishes lies in the quality of its raw material. The Lalit Temple View Khajuraho overlooks nine acres of beautifully manicured vegetable gardens.They grow fruits and vegetables such as Papaya, Banana, Mango, Cherry Tomato, Cauliflower, Cabbage, Ridge Gourd, Spinach, Egg Plant, Green Chilly, Broccoli, Ice berg lettuce, Coriander, Zucchini, Red Cabbage in their gardens. Thus, the menu at the hotel boasts of aromatic and flavoursome dishes. The art of dining has been perfected by blending the finest flavours and design elements.
If it’s time to celebrate Gurudev Rabindranath Tagore’s 156th birth anniversary, Kolkata is ready with various events to commemorate the special occasion. ‘Two Poets’ is a unique musical conceived by versatile Assam based vocalist Chandrima Bhattacharya which deals a magical blend of Tagore’s songs along with compositions of the legendary poet-lyricist Gulzar. Both are poets from different times but this musical revolves around the similarities between their creative urges. Be it songs of love, Monsoon, philosophy of life, both poets connect well. It shows the way how a living legend gets inspired from another Bard of a different era. Also Read – Add new books to your shelfGulzar once said, “My first introduction to Tagore was when I came to India after partition. Tagore has this beautiful way of giving details. He wrote all by experience and living those moments. Nothing feels imaginary in his works. Being a lyricist, I’m deeply aware of sounds in poetry. People beyond Bengal don’t even know the romantic poems of his young age. They don’t even know that he wrote romantic poems. They don’t even know that he was young! People know him as the bearded man who wrote the national anthem. So people take him in the line of Mahatma Gandhi and Pandit Nehru. He was a playful young man too. One should learn about this side of him as well. Look at his poetry for the young. He wrote so much for children. It is sad that apart from a few of his writings, children today are not taught Tagore.” Also Read – Over 2 hours screen time daily will make your kids impulsiveSudarshan Chakravorty, an ace choreographer, is all set to present the musical journey, performing as a story teller for the first time. People have watched him dance, and produce big dance shows before. Chandrima Bhattacharya, who will sing the songs of Tagore and Gulzar, said, “This is happening for the first time in Kolkata. I am thrilled as this musical deals with very unusual gems from both the greats. Gulzarji’s ghazals, poetry, his personal anecdotes regarding the Bard will add a different colour to the whole venture.” Gulzar has often said that the ‘Geetanjali’ changed his life and that one whole community(Bengalis) lives on Tagore. The programme will include eleven songs in all, five from Tagore’s ‘Geetanjali’ and six from Gulzar. ‘Amare tumi ashesh korecho’ by Tagore is to be paired with Gulzar’s ‘Shyam se aankh me nami si hai/aaj phir aapki kaami si hai’, and Gulzar’s ‘Ek ekele ek shahar mei’ would be paired with ‘Amar ei path chalatei anando’ in the programme. The script has been penned by Angshuman Bhattacharya, supported by Romil and Sudipta Chanda. ‘Two Poets – Dui Kobi’ will be held on May 18 at a tea lounge in South Kolkata. A man for all seasons, Tagore’s birthday is celebrated with aplomb and a plethora of cultural ensembles in the month of May. So where and how did Tagore spend his birthdays?That is answered by ‘Jonmodine Rabindranath’ – an initiative by interdisciplinary artist Sujoy Prasad Chatterjee comprising narratives by popular film actor Sohini Sarkar, medical professional Sharmistha Ray and Sujoy himself. “Sarala Devi first started celebrating Tagore’s birthday when the poet was 27 years old. She gifted him a dhoti and a chador(shawl). This was after Satyandranath Tagore returned from abroad. There is another anecdote that Lady Ranu Mukerji (then Adhikari) gifted him a handkerchief on his 59th birthday. Another slightly tragic story would be of his elder brother Satyendranath Tagore and Rabindranath parting ways in terms of their estate on one of his birthdays. The Padma and Silaidaha were no longer part of his territory,” Chatterjee told Millennium Post.Interestingly, this show encompasses anecdotes, stories and incidents associated with the celebration of his birthdays till the very end (80 years). The chronology is maintained and the changing social and political dynamics of the country also gets reflected in the script which documents all of this through songs and stories. The songs will be presented by Srovonti Basu Bandopadhyay. The show is being organised by Highland Park Housing Society and opens on May 13 at Highland Park Club. Following the show, there would be a concert by acclaimed Rabindrasangeet vocalist Jayati Chakraborty.