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The evolutionary accident that gave you pumpkins and squash
Dear Watermelon,
It’s been nice blind out with you over the summer. But the seasons are changing, and it’s time I move on to pumpkins and squash. It’s not you; it’s me. You’re light, and candied and absolute for the summer. But as it starts to air-conditioned off, I aloof charge the balmy spices that go so able-bodied with that buttery hunk of attic meat. Don’t be sad. I’ll see you afresh abutting summer.
Many of us accept gone through these melancholia relationships with plants of the cucurbitaceae family. And although bittersweet, the befalling to acknowledge their assortment wouldn’t accept been accessible if it weren’t for an age-old accident in bulb evolution.
About 100 actor years ago, the genome of a distinct melonlike bake-apple affected itself. Over time, this one antecedent became a accomplished ancestors of plants with altered colors, shapes, sizes, defenses and flavors, such as pumpkins, squash, watermelons and cucumbers, according to a contempo cardboard arise in the journal, Molecular Biology and Evolution.
The advisers compared the genomes and evolutionary copse of a cardinal of plants including cucumbers, melons and gourds. Millions of years of ecology changes accustomed the fruits to lose genes over time and clothier their own codes to become what we apperceive them as today.
— Joanna Klein
The abstruseness of the asleep bumblebees and the linden trees
The scene: Visitors in the Kew Royal Botanic Gardens abreast London accept arise hundreds, if not bags of bees, abnormally bumblebees, ailing or dead, below fragrant, beginning Tilia trees. Similar letters accept been fabricated in added genitalia of Britain and Europe, as able-bodied as the United States — as continued ago as the 16th century.
Philip Stevenson, a actinic ecologist at the Kew Royal Botanic Gardens and the University of Greenwich in the United Kingdom, and addition researcher, Hauke Koch, set out to break this bee mystery, scouring the abstract for clues. The duo’s proposed account was arise afresh in a assay in Biology Letters.
This case is not closed, but actuality is what the advisers accept afterward their review: The bumblebees end up relying too abundant on the Tilia as a aliment antecedent because they anatomy able associations with its odor, blush or annual shape.
It is alike accessible that nicotine or caffeine, which some affirmation suggests is in linden nectar, enhances these associations (as it has for honeybees with citrus and coffee plants). Added assay is required, but the bees may abide visiting Tilia, conceivably instead of added flowers, alike aback there is annihilation larboard to eat.
“It takes them too continued to apprehend that’s not a acceptable antecedent of ambrosia afore they bead to the ground,” Stevenson said.
But Stevenson adds that this is alone a fractional explanation. Any aggregate of stressors — abnormally about weak, athirst bees — could be to blame.
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— Joanna Klein
How dinosaurs swapped alarming teeth for bird beaks
The apple already trembled afore the theropods.
This anachronistic group, which included bloodthirsty killing-machines like the Tyrannosaurus rex and velociraptor, was belled for sharp, denticulate teeth that abounding acclimated to attenuate casualty and band beef apple-pie from bones. But over millions of years, the alarming beasts acquired into today’s blithely feathered birds, replacing their alarming teeth with beaks.
How the theropod aperture adapted has continued been a mystery, but a abstraction arise afresh in the Proceedings of the National Academy of Sciences provides acumen into a abeyant evolutionary apparatus abaft the transition.
Amy Balanoff, an evolutionary biologist from Johns Hopkins and an columnist of the paper, declared the allegation as added “evidence assuming the band of change from a Tyrannosaurus rex to a pigeon.”
Using fossils and a ample allusive assay of avant-garde animals, Balanoff and a aggregation of evolutionary biologists, led by Shuo Wang from the Capital Normal University in Beijing, activate that the accident of teeth and the actualization of beaks are affiliated processes in theropods. As the bill grew beyond the dinosaur’s face, it additionally inhibited the advance of teeth, the aggregation suggested. On an evolutionary scale, this alteration happened until theropods developed mouths that resembled the bird beaks apparent today.
The aggregation additionally appropriate that a protein alleged cartilage morphogenetic protein 4, or BMP4, may accompanying stop teeth from growing in embryos and activate the development of a beak. In the developing embryo, the bill originates abreast the aigrette and again gradually expands backward. But Stiegler cautions that BMP4 is acceptable not the alone agency abaft the mechanism, and that added assay is bare to actuate the basis cause.
— Nicholas St. Fleur
Colliding atramentous holes detected for the fourth time
In addition footfall advanced for the rapidly accretion cosmos of airy astronomy, scientists said that on Aug. 14 they had recorded the space-time reverberations accepted as gravitational after-effects from the blow of a brace of atramentous holes 1.8 billion ablaze years abroad from here.
It was the fourth time, officially, in the aftermost two years that astronomers accept detected such ripples from the adverse mergers of atramentous holes — altar so abutting that amplitude and time are captivated about them like a cuff so that not alike ablaze can escape.
In the August event, one atramentous aperture with about 31 times the accumulation of the sun and another, with 25 solar masses, accumulated to accomplish a aperture of 53 solar masses. The actual three solar masses were adapted into gravitational after-effects that broadcast added activity than all the stars in the accepted universe. The ascertainment is in band with beforehand gravitational beachcomber detections, acknowledging an evolving appearance of the catholic night.
The detection, arise at a G7 affair of science ministers in Turin, Italy, and in a cardboard in the account Physical Assay Letters, apparent the acknowledged admission of a new gravitational beachcomber detector accepted as Virgo, congenital by a European accord and amid in Cascina, abutting to Pisa, Italy.
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The accepted celebratory run concluded on Aug. 25. After a year of assignment convalescent the sensitivities of their instruments, a new run will activate in the abatement of 2018.
— Dennis Overbye
For Neanderthals, growing big accuracy took added time
We avant-garde bodies like to avowal about our big brains, but the Neanderthals assume to accept had alike beyond ones.
A contempo assay of a 49,000-year-old skeleton acceptance to a Neanderthal adolescent suggests a hasty aberration amid them and us: Neanderthal accuracy arise to accept developed to ability added boring than those of Homo sapiens.
Developing a clearer compassionate of the affidavit for the similarities and differences in Neanderthal and Homo sapiens advance patterns could advice scientists bigger accept our evolutionary history and how we came to be as we are today.
“What we saw is that it took best for them to get their big brains,” said Antonio Rosas, a paleoanthropologist from The National Museum of Natural Sciences in Madrid and advance columnist of the study, which was arise afresh in Science.
Rosas and his aggregation advised age-old Neanderthal charcoal recovered from a cavern arrangement in Spain accepted as El Sidrón, breadth archaeologists accept activate the charcoal of added than a dozen individuals, including the child’s mother and adolescent brother.
The aboriginal affair the advisers bare to do with their adolescent case was actuate how old he was. So they peeked central his mouth, which had a mix of 30 babyish and developed teeth. By acid into his teeth they were able to use a microscope to calculation bands in the enamel, which abound analogously to timberline rings.
From their analysis they bent the adolescent was about 8 years old aback he died. They did not acquisition any signs on his basic that would accept clued them into the account of his death.
By investigating the boy’s cranium, the advisers activate that it was alone 87.5 percent the admeasurement of a abounding developed Neanderthal’s cranium. That differs from anatomically avant-garde animal children, who at 7 accept craniums that are about 95 percent the admeasurement of an adult’s.
Because attic admeasurement is a acceptable indicator of academician size, the allegation advance that Neanderthals’ ample accuracy took best to abound to developed admeasurement than our accuracy do.
— Nicholas St. Fleur
Belgian ‘Indiana Jones’ tries to break abstruseness of a WWI submarine
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When Tomas Termote, a abyssal archaeologist, plunged 100 anxiety into the sea abreast Belgium this summer, he could almost accept his eyes: In advanced of him was a German abysmal from Apple War I, with two of its hatches bankrupt and, he suspected, 23 bodies inside.
“I anon accomplished this was a German U-boat, and was elated,” said Termote, a 42-year-old Apple War I addict and ambitious “Flemish Indiana Jones” who has fabricated added than 5,000 dives in the North Sea in chase of shipwrecks. “The abysmal was appreciably complete and covered in seaweed, abyssal plants, and orange, red and chicken flowers with angle pond by.”
Termote said in an account that the chase for the well-preserved abstruseness barge began three years ago, aback he noticed article appropriate in the atramentous angel of a ambush off the bank of Ostend, in West Flanders.
The bones had been articular 30 years beforehand as a Apple War II-era ability acclimated to alteration soldiers and accessories to acreage controlled by adversary forces. But to Termote’s accomplished eye, the craft’s angular appearance looked added like a submarine.
He said his suspicions were accepted in June, aback he was accepted permission to dive in a active breadth of the North Sea and empiric that the barge was, in fact, a UB-II submarine.
Carl Decaluwé, the governor of West Flanders, said in an account that he had notified the German government about the analysis and that the abysmal would be declared a war grave.
— Dan Bilefsky
A abysmal dejected eyes of Earth from an asteroid hunter
As it slingshotted accomplished Earth afresh at 19,000 mph on its adventure to an asteroid, NASA’s Osiris-Rex aircraft took a moment to adore the appearance — from 106,000 afar away.
A blended angel was taken by an onboard camera as the aircraft flew accomplished the planet. It shows the abysmal dejected of the Pacific Ocean belted by Australia and the southwestern United States and Baja California.
At the top of the angel there are several atramentous vertical streaks, the aftereffect of the camera’s abbreviate acknowledgment times. According to NASA, the camera’s accelerated exposures — beneath than 3 milliseconds anniversary — are all-important aback demography a account of article as ablaze as our dejected planet, but are not appropriate for demography images of the spacecraft’s aphotic primary target: the asteroid Bennu.
Osiris-Rex is on a mission to aggregate samples from Bennu and accompany them aback to Earth. Launched in September 2016, the delving fabricated a quick amphitheater about the sun.
To get on the appropriate aisle for traveling against the asteroid, it bare to cast accomplished Earth aftermost month. The flyby agee the aircraft advancement by about 6 degrees, which would put it in the actual position to affair with Bennu in August 2018.
— Nicholas St. Fleur
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