It makes sense to think that the T3SS didn’t evolve into the bacterial flagellum, but that the bacterial flagellum shed some protein parts to become a T3SS.
Using near-UV spectroscopic data from the Space Telescope Imaging Spectrograph (STIS) on the NASA/ESA Hubble Space Telescope, astronomers discovered four white dwarfs orbiting nearby red dwarf stars.
Plague swept through groups of hunter-gatherers in southeastern Siberia 5,500 years ago, leaving dozens dead in its wake—with DNA from Yersinia pestis bacteria still trapped inside their teeth.
University of Oxford ancient DNA researcher Ruairidh Macleod and his colleagues recently sequenced the telltale bacterial DNA in teeth from plague victims at four ancient cemeteries in the area around Russia’s Lake Baikal. The tragedy that befell these communities is now the earliest known plague outbreak, courtesy of the oldest strain of Y. pestis ever sequenced.
Unearthing a new backstory for the plague
Until recently, scientists who study the evolution of diseases have held two fairly solid ideas about the origins of plague, the disease caused by Yersinia pestis bacteria. It's a scourge so awful that it has gone down in history as not just a plague but the plague. The first idea is that the earliest strains didn't have the right genetic traits to be really lethal. And the second is that the plague first began menacing humans when the first farmers settled in densely packed towns alongside rats and domestic animals.
Plague swept through groups of hunter-gatherers in southeastern Siberia 5,500 years ago, leaving dozens dead in its wake—with DNA from Yersinia pestis bacteria still trapped inside their teeth.
University of Oxford ancient DNA researcher Ruairidh Macleod and his colleagues recently sequenced the telltale bacterial DNA in teeth from plague victims at four ancient cemeteries in the area around Russia’s Lake Baikal. The tragedy that befell these communities is now the earliest known plague outbreak, courtesy of the oldest strain of Y. pestis ever sequenced.
Unearthing a new backstory for the plague
Until recently, scientists who study the evolution of diseases have held two fairly solid ideas about the origins of plague, the disease caused by Yersinia pestis bacteria. It's a scourge so awful that it has gone down in history as not just a plague but the plague. The first idea is that the earliest strains didn't have the right genetic traits to be really lethal. And the second is that the plague first began menacing humans when the first farmers settled in densely packed towns alongside rats and domestic animals.
Uno studio pubblicato su Nature ha scoperto che la peste era presente tra i cacciatori-raccoglitori della Siberia già circa 5.500 anni fa, rappresentando la più antica evidenza conosciuta della malattia.I ricercatori hanno analizzato resti umani dell’Età della Pietra provenienti da quattro siti lungo il fiume Angara, nei pressi del Lago Baikal. Attraverso l’analisi del DNA […]
Bien avant les grandes pandémies médiévales, la peste frappait déjà les populations humaines. En Sibérie, des chercheurs ont identifié la plus ancienne infection connue à Yersinia pestis, vieille de 5 500 ans. Une découverte qui suggère que cette maladie pouvait déjà provoquer des épidémies...
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