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Cell Has Automatic Jam-Clearing Proofreading Machinery

Findings at Rockefeller University have scientists excited.  DNA copying machines work on a “sliding clamp” that can hold two repair machines at the same time.  One is a low-fidelity repair tool, the other a high-fidelity repair tool.  Usually, the high-fidelity one is active, but when it needs a bigger hammer that is perhaps more effective […]

Reader Project: Calculate the Speed of Plant Package Delivery

Get out your pencil and hand calculator.  A team of Swedish and French scientists measured the velocity of a message traveling on the intraplant internet (see 08/12/2005, 11/09/2004, 10/04/2004 and 07/13/2001 entries).  Publishing in Science,1 they believe they have witnessed a signaling molecule, in the form of a messenger-RNA (mRNA; see yesterday’s entry) moving through […]

RNA Research Uncovers a Previously Ignored Universe of Genetic Information

A slow revolution is occurring in the study of genetic information.  Until recently, the only interesting items in DNA sequences were the genes – the genetic codes for proteins.  Since these usually represented only a small fraction of an organism’s genome, it was assumed the rest of the material was “junk DNA” – sequences that […]

Men Aren’t Going Extinct – Yet

Not long ago, evolutionary biologists were predicting the demise of manhood (see 11/01/2001, 03/31/2004).  The idea was that the Y chromosome, with no redundant copy (unlike the female’s two X chromosomes, and all others) appeared to be shriveling up and mutating itself out of existence.  Now that the chimpanzee genome has been published (see 09/01/2005 […]

Chimpanzee Genome Published: Is There a Monkey in Your Genes?

Nature’s cover story September 1 is about the publication of the chimpanzee genome.  Evolutionists are digging through the data for evidence of human common ancestry.  Have they found it?  The results, as usual, are mixed: MSNBC News states the situation concisely: “Genome comparison reveals many similarities – and crucial differences.”  Here is the gist of […]

What Do You Get When You Cross a Lion with a Tiger?

A liger, that’s what.  No kidding: you get a big cat with a mane and faint stripes that likes to play in the water.  National Geographic News has a special article, with photos, about ligers. This is offered without much comment, just for those who want to learn about something unusual in the animal kingdom, […]

What Is Really Known About the Genetic Basis of Evolution?

Now that the genomes of a variety of plants and animals have been published, is there a clear picture of evolution emerging?  Sean Carroll (Howard Hughes Medical Institute) wrote a review in PLoS Biology,1 in which he explored the current thinking about the evolution of anatomy at the genetic level.  The thing to watch for […]

More Evidence the Molecular Clock is Broken

“We live in interesting times,” grinned David Penny in Nature,1 reporting on how estimates of evolutionary past based on comparative genomics (the molecular clock) is producing confusing results.  Apparently, evolutionary geneticists are going to have to make use of the theory of relativity – i.e., that how fast the clock ticks depends on the viewpoint […]

The Death of the Concept of “Junk DNA”

“God don’t make no junk” has been a slogan for the self-esteem movement, and now no less than Science Now is providing support at the genetic level.  “Don’t call it junk” the article announces, indicating that stretches of non-coding DNA are apparently not useless regions of material as previously believed, but vital to the regulation […]

Cell Wonders Accelerate

Scientific papers on cell biology continue to uncover amazing things as techniques improve to peer into the workings of these units of life.  Here are our Top Ten from the last few weeks: Immunity Tunes:  A press release from Johns Hopkins talked about how, unlike other cells, immune cells undergo a “dizzying loop of activity” […]

Descendants Can Overcome Parental Mutations

Bad genes from both parents may not spell doom in all cases.  Scientists at Purdue University found that if two parents have bad mutations, the child can sometimes reconstruct the correct gene from the grandparents.  “Our genetic training tells us that’s just not possible,” said Bob Pruitt, co-researcher on the team that ran the experiment […]

Eugenics Documentary Opens at Holocaust Museum

Michael Ollove at the Baltimore Sun reports on a new exhibit at the U.S. Holocaust Museum entitled Deadly Medicine: Creating the Master Race.  The exhibit shows a 1937 Nazi propaganda film that invokes the law of natural selection as support for weeding out the unfit.  Ollove writes, The narrator declares that “we humans have sinned […]

Evolution As Assumption

51; Reasoning requires premises: axioms or truths taken for granted.  Notice the premise of reasoning stated in a recent article on Science Daily: “Because all living organisms inherit their genomes from ancestral genomes, computational biologists at MIT reasoned that they could use modern-day genomes to reconstruct the evolution of ancient microbes.”  They used an evolutionary […]

Human-Ape Gap Quadruples

Remember that old truism that humans and chimpanzees share 98.5% of their genes?  Try 94% instead.  That’s a new estimate by Matthew Hahn (Indiana U) and a team who published in a new online journal, PLoS One.1  J.R. Minkel, writing for Scientific American, said “The 6 percent difference is considerably larger than the commonly cited […]

Stem Cell Breakthrough

Stem cells from skin cells: it’s all over the news – see EurekAlert 1, EurekAlert 2, EurekAlert 3, EurekAlert 4, National Geographic News, BreitBart.com, BBC News 1, BBC News 2, MSNBC and and PhysOrg for sample reports.  Two teams working independently, one in Japan and one in America, were able to tinker with just four […]
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