Stefan Ruhl

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Stefan Ruhl

Stefan Ruhl

@Ruhl_Lab

We study how #glycans in #saliva make #bacteria stick to #teeth

University at Buffalo, NY, USA 加入时间 Eylül 2016
231 关注372 粉丝
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Ann Gibbons
Ann Gibbons@evolutionscribe·
Another gift from Neanderthals and Denisovans: DNA from ancient bones reveals how Indigenous Americans got their mucus | Science | AAAS science.org/content/articl…
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John Hawks
John Hawks@johnhawks·
Published this week was one of the best evolutionary stories I’ve seen in a while. In a game of “genetic telephone” a 72-kb chunk of Denisovan DNA introgressed to Neanderthals, then slid into modern humans. And it makes mucus. johnhawks.net/p/the-gene-fro…
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Stefan Ruhl
Stefan Ruhl@Ruhl_Lab·
Dear Friends, Colleagues, and Followers, I have reached a stage where I decided to take a break from the Twitter/X media platform. I will reconsider my decision after an extended period of time, but if I don't miss anything by then, I will cancel my account. // Stefan
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Stefan Ruhl
Stefan Ruhl@Ruhl_Lab·
@johnhawks Could it have come from some adornment held ox fixated between the teeth that was wiggling back and forth during movements of the body? I am sure you must have thought of all these possibilities. I think a lot of repetitive friction must have caused these grooves.
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John Hawks
John Hawks@johnhawks·
Not necessarily severe but repetitive. However I also would not rule out the use of the teeth for shaping of stems or sticks as probes, or making stems pliable for weaving. The hangup with this is the location of the grooves near the gingiva between teeth, which is a bit different from most recent people who have used teeth in crafting.
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John Hawks
John Hawks@johnhawks·
The most substantial skeleton attributed to Homo habilis, extremely fragmented, is OH 62—around 1.8 million years old from the FLK site at Olduvai Gorge. Two teeth have grooves reflecting the individual's habitual use of toothpicks, among the oldest known. #FossilFriday
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Stefan Ruhl 已转推
Ann Gibbons
Ann Gibbons@evolutionscribe·
Sugars to feed the brain? If these dates are correct, humans were able to digest more sugars in starch when our ancestors' brains went through a significant expansion: How humans evolved a starch-digesting superpower long before farming | Science | AAAS science.org/content/articl…
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