Could the three established domains of life - eukaryotes, bacteria and archaea - be joined by a fourth?
posted by Artw on Mar 25, 2011 - 53 comments

Bobby Dunbar was a four year-old boy that vanished in 1912, while on a fishing trip with his family in a Louisiana swamp. For weeks, searchers combed the area looking for him. The lake where he went missing was dynamited. Alligators were captured and had their bellies slit open to see if the body was inside. Nothing was found except a set of child's footprints leading to an old railroad trestle. Eight months later, the police found Bobby in the company of a drifter with a horse-drawn cart. He protested his innocence but was arrested and charged with kidnapping. Another woman came forward and claimed Bobby was, in fact, her son. But she was an unmarried fieldworker, and her claims were dismissed. The crime became a nationwide media event and the boy was returned to his parents, and their hometown held a parade in his honor. Bobby returned to his life. Ninety-one years later, Bobby Dunbar's granddaughter uncovered the truth.
posted by smoothvirus on Mar 19, 2008 - 78 comments

Scientists have built the first synthetic genome by stringing together 147 pages of letters representing the building blocks of DNA.
posted by geeknik on Jan 26, 2008 - 18 comments

The origin of life?! I heard from an authority in molecular biology today that a group of researchers funded by the Carnegie Institution and NASA believe they've discovered the origin of RNA, and with that, the origin of life. This new discovery grew out of NASA's Deep Impact mission to study the composition of comets. Specifically, they started investigating a kind of carbon that forms in layers, with each layer slighly offset from the previous one in a helix shape. Significantly, the thickness of these carbon layers corresponds with the thickness of each twist in a strand of RNA. It turns out that the individual building blocks of RNA are capable of bonding to this layered carbon when exposed to UV radiation. Once this has happened, apparently formaldehyde can then bond to the building blocks of RNA on the carbon "pattern", allowing the bonded RNA to slough off into the primordial soup. Over time, some of these RNA strands could fold and bond to themselves, forming DNA. Formaldehyde, the initial bonding material, would eventually be replaced by a more chemically sophisticated substance, creating the chemical bond that we observe today in DNA. Expect a paper on it to be released in approximately three months with all the details.
posted by insomnia_lj on Nov 6, 2005 - 66 comments