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          Moody’s upgradation of Pakistan outlook affirms sound financial policies: Finance Ministry

          Moody’s upgradation of Pakistan outlook affirms sound financial policies: Finance Ministry

          Gold up by Rs400 to Rs123,900 per tola

          Gold soars to all-time high of Rs132,000 per tola

          The Asian Development Bank’s COVID-19 response reaches $9.3 billion to end July 2020

          The Asian Development Bank’s COVID-19 response reaches $9.3 billion to end July 2020

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          Financial close of Thar Block-2 Power Plant in Sept end, says Asim Saleem Bajwa

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          Over 70 held in Melbourne after protest against lockdown

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              Stingless Tetragonula Bees build their combs like a crystal

              Online Desk by Online Desk
              29/07/2020
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              Stingless Tetragonula Bees build their combs like a crystal
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              According to a new study led by University of Cambridge researchers, the processes that drive atoms or molecules to aggregate as a crystal have the same mathematical structure as the processes that drive stingless bees of the genus Tetragonula when making their combs. Tetragonula is a genus of over 30 species in the tribe Meliponini (stingless bees) found in Australia, New Guinea, Indonesia, The Philippines, the Solomon Islands, Malaysia, Thailand, Sri Lanka and India. These bees are black or dark brown but they have dense white fur on their faces and sides. They measure between 3 and 4 mm in length and are stingless and so are harmless to humans.

              Tetragonula bees are highly social, with a ratio of one queen to up to 10,000 workers, and have strict hierarchies. They naturally nest in hollow trunks, tree branches and rock crevices. They pollinate several key tropical crops and store honey and pollen in honeycomb cells. “Various species of the genus Tetragonula construct brood combs with open 3D structures consisting of terraces built one on top of another,” said lead author Professor Silvana Cardoso and her colleagues from the University of Cambridge, the Universidad de Granada and the Messerli Research Institute at the University of Veterinary Medicine Vienna. “Worker bees add new cells to the edges of each terrace, each of which is then filled with an egg and closed before repeating the process.” “The resulting morphology is similar to what we see in crystal growth, where crystals grow in terraces of atoms or molecules one on top of another.”

              “Likewise, although bees are free to move across and between the terraces — the levels are open so that the bees can get between them like a multi-storey car park — bees are found concentrated at the terraces in these 3D structures.” Combs of Tetragonula carbonaria: (left) the open structure is like a multi-storey car park or, in this case of a spiral ramp, like the Guggenheim museum in New York; (right) worker bees are observed to spend time clustered at the growing edges of terraces. Image credit: Tim Heard. Combs of Tetragonula carbonaria: (left) the open structure is like a multi-storey car park or, in this case of a spiral ramp, like the Guggenheim museum in New York; (right) worker bees are observed to spend time clustered at the growing edges of terraces. Image credit: Tim Heard.

              Professor Cardoso and co-authors aimed to investigate how Tetragonula bees create such complex brood comb structures.

              The researchers examined the bee nests and found a variety of structures that can be classified into: target (i.e. bull’s eye-shaped) patterns, spirals, double spirals and more disordered terraces.

              They then used mathematical modeling to simulate the construction of the Tetragonula combs.

              “Our model shows the minimal complexity necessary — the minimal amount of information a bee needs — to be able to construct such a structure,” they explained.

              “It has been considered that bees might be using some overall plan set down — for example — by diffusing chemicals. But our model demonstrates that they do not need such an overall plan if they have the small set of behavioral rules to follow.”

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              “Thus bee behavior is determined by something: pressure measurements, chemical measurements or dimension/flatness measurements. Bees sense something in their environment, make some sort of computations and then do something.”

              “But what is fundamentally different between one view and the other is that in one case only local information is available; in the other view global information is available, albeit sampled locally.”

              The team’s model shows that Tetragonula bee comb construction, like crystal construction, can be the result of self-organization.

              “Crystal growth and bee comb construction are two systems operating within very different spheres of science,” the scientists said.

              “So what leads to the similar structures? This is the beauty of the applicability of mathematics to nature.”

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              “It turns out, so often, that similar laws and similar principles govern the formation of very different systems in different areas of science, and thus are describable by the same mathematics. And this is one of those cases.”

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              “Both crystal growth and this bee comb construction are describable within the mathematical framework of excitable media.”

              “Crystals, slime molds, the brain, the heart, chemical oscillators, forest fires and many other systems can function as excitable media. And, in this instance, bees making their combs too.”

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