The type of DNA extracted and analysed is that stored in mitochondria - the "powerhouses" of cells. This mitochondrial DNA (mtDNA) is passed down from a mother to her offspring, providing a unique record of maternal inheritance. Using technology pioneered in the study of DNA from Neanderthal bones, they were able to distinguish between ancient genetic material from the Kostenki male and contamination from modern people who handled the bones, or whose DNA reached the remains by some other means.
Using technology pioneered in the study of DNA from Neanderthal bones, they were able to distinguish between ancient genetic material from the Kostenki male and contamination from modern people who handled the bones, or whose DNA reached the remains by some other means.
Future studies like the one in Current Biology could help shed light on whether the humans living in Europe 30,000 years ago are the direct ancestors of modern populations or whether they were replaced by immigrants who introduced farming to the continent several thousand years ago.
I've been really pissed at The Obama Administration (and President Obama) lately, which has made it difficult for me to see the good things that he's been doing. This week, the Obama Administration did two things that were more than just good. They were great.First, the Obama Administration will restore those millions of missing Bush emails.
The second thing was President Obama issued an executive order declaring that "no information may remain classified indefinitely, " and which was done "as part of a sweeping overhaul of the executive branch's system for protecting classified national security information."
Click on this NASA web site and download the 2010 ISS Calendar. Notice something odd about the dates? Did January 1, 2010 start on a Wednesday? Does February have 30 days? Does March have 31 days? Does April have 31 days? And December 1, 2010 is New Years Day. That's as far as I went. Doesn't anyone check these things before putting them on their web site? WOW! Must be the same group that mixed up miles and kilometers.
ScienceDaily (Jan. 3, 2010) -- Scientists from The Scripps Research Institute have determined for the first time that prions, bits of infectious protein devoid of DNA or RNA that can cause fatal neurodegenerative disease, are capable of Darwinian evolution.> The study from Scripps Florida in Jupiter shows that prions can develop large numbers of mutations at the protein level and, through natural selection, these mutations can eventually bring about such evolutionary adaptations as drug resistance, a phenomenon previously known to occur only in bacteria and viruses. These breakthrough findings also suggest that the normal prion protein -- which occurs naturally in human cells -- may prove to be a more effective therapeutic target than its abnormal toxic relation. The study was published in the December 31, 2009 issue of the journal Science Express, an advance, online edition of the journal Science. "On the face of it, you have exactly the same process of mutation and adaptive change in prions as you see in viruses," said Charles Weissmann, M.D., Ph.D., the head of Scripps Florida's Department of Infectology, who led the study. "This means that this pattern of Darwinian evolution appears to be universally active. In viruses, mutation is linked to changes in nucleic acid sequence that leads to resistance. Now, this adaptability has moved one level down -- to prions and protein folding -- and it's clear that you do not need nucleic acid for the process of evolution."
ScienceDaily (Jan. 3, 2010) -- Scientists from The Scripps Research Institute have determined for the first time that prions, bits of infectious protein devoid of DNA or RNA that can cause fatal neurodegenerative disease, are capable of Darwinian evolution.>
The study from Scripps Florida in Jupiter shows that prions can develop large numbers of mutations at the protein level and, through natural selection, these mutations can eventually bring about such evolutionary adaptations as drug resistance, a phenomenon previously known to occur only in bacteria and viruses. These breakthrough findings also suggest that the normal prion protein -- which occurs naturally in human cells -- may prove to be a more effective therapeutic target than its abnormal toxic relation.
The study was published in the December 31, 2009 issue of the journal Science Express, an advance, online edition of the journal Science.
"On the face of it, you have exactly the same process of mutation and adaptive change in prions as you see in viruses," said Charles Weissmann, M.D., Ph.D., the head of Scripps Florida's Department of Infectology, who led the study. "This means that this pattern of Darwinian evolution appears to be universally active. In viruses, mutation is linked to changes in nucleic acid sequence that leads to resistance. Now, this adaptability has moved one level down -- to prions and protein folding -- and it's clear that you do not need nucleic acid for the process of evolution."
... Now, this adaptability has moved one level down -- to prions and protein folding -- and it's clear that you do not need nucleic acid for the process of evolution."
Just boned up on prions in my Lehninger text. I think this author is full of shit. But anything for a publication, right? In the end, might makes right. Nothing has changed since the caveman.
Reporting from Nairobi, Kenya - In a year as a "freelance" slum electrician, Francis Otieno has been shocked five times. Three of the accidents were "not so bad," just enough to throw him across the room. Two nearly killed him. "I just cried out. I didn't know what was going on. I passed out," he says. "For two days, I didn't know where I was." But he was luckier than his best friend, who had the job before him: He was killed when he jumped on a roof to fix a short, unaware that the roof was live because a rat had nibbled at a wire. If people here in the Kibera slum outside Nairobi, the capital, waited for the government to connect every mud hut and corrugated iron shack to electricity, they'd never have light. It's DIY or do without.
Gordon Brown outlines new airport security regime but opinions remain mixed as to whether scanners can detect liquids
New full-body scanners are already being ordered by the British Airports Authority, the prime minister said this morning as he outlined a new regime of tightened airport security. Speaking on BBC One's Andrew Marr programme, Gordon Brown pre-empted the findings of his own review by saying future passengers must expect to be scanned by the controversial scanners. The devices have received mixed appraisals on whether they are suitable to detect the new type of explosive that 23-year-old Nigerian Umar Farouk Abdulmutallab is accused of using in an attempt to blow up a plane over Detroit on Christmas Day.
Speaking on BBC One's Andrew Marr programme, Gordon Brown pre-empted the findings of his own review by saying future passengers must expect to be scanned by the controversial scanners. The devices have received mixed appraisals on whether they are suitable to detect the new type of explosive that 23-year-old Nigerian Umar Farouk Abdulmutallab is accused of using in an attempt to blow up a plane over Detroit on Christmas Day.
The education-specific channel of its iTunes Store, launched in 2007, has reached a new milestone, recording more than 100 million downloads, Apple told CNET on Friday. According to Apple, one of the most popular areas of iTunes U has been that of the United Kingdom-based Open University (iTunes link),
The education-specific channel of its iTunes Store, launched in 2007, has reached a new milestone, recording more than 100 million downloads, Apple told CNET on Friday.
According to Apple, one of the most popular areas of iTunes U has been that of the United Kingdom-based Open University (iTunes link),
