Bacterial evolution


	Bacterial evolution

annkottner

6-30-2008 3:33 PM

87 views

tags:

evolution

annkottner says:

Clear evidence of evolution at work

Add a Comment

Login to Comment. Not a member yet? Sign up

Related Clips

The Cultural Evolution Of Religion

What Is a Strength?

The God delusion

Is Aging an Accident of Evolution? Scient...

Heathen Tv

"Tnnel of Love" -beautiful !

Who is Left?

Today's Top Clips

visit the Top Clips page

View the Top Clips from June 30, 2008

Embed This Clip In Your Site...

<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/9817d9b8-088d-4d93-99d3-2810395d3ac9/F5D46D88-A344-4056-8C2D-F7ADABA49A3B/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://arstechnica.com/articles/culture/conservapedias-evolutionary-foibles.ars" href="http://arstechnica.com/articles/culture/conservapedias-evolutionary-foibles.ars" style="font-size: 11px;">arstechnica.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://arstechnica.com/articles/culture/conservapedias-evolutionary-foibles.ars">Ars <A href="http://arstechnica.com/journals/science.ars/2008/06/04/tracking-adaptation-as-bacteria-evolve">covered</A> the research earlier this month, when <A href="http://www.pnas.org/cgi/content/abstract/105/23/7899">a paper</A> reporting it was first published in the <EM>Proceedings of the National Academies of Science</EM>.
Richard Lenski and his colleagues have been conducting a long-term
experiment in bacterial evolution, one that has encompassed over 30,000
generations of bacteria going back over 20 years. Many of the bacteria
have evolved the ability to better utilize the sugar available in their
cultures, but one strain underwent at least three distinct changes (at
generation 27,000, 31,000 and 33,000) that enabled them to access
citrate present in the medium—something their parents were incapable
of. Lenski saved samples of every culture at intervals of 500
generations, and his paper suggested his lab was going back and
sequencing the genomes of the intermediaries to try to find out the
genetic basis for the evolution of this new trait.
</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/F5D46D88-A344-4056-8C2D-F7ADABA49A3B/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

Clipmarks: Home; New Clips; Top Clips; Dashboard

Popular Topics: News; Life; Science; Technology; Entertainment

Get Started: Sign Up; Install Clipping Tool; How Clipping Works; Clip-to-Blog™; ClipSearch

Tools and Resources: FAQ; ClipWeek; Top Clippers; Top Tags; Site Map

About Clipmarks: About Us; Contact; Blog; Copyright; Privacy; EULA

Search Options

Related Clips

Today's Top Clips