What'sNEW November–December 201024 December 2010We do see substitutes, what level of substitution, we're not sure; we're not clear about that. — Felisa Wolfe-Simon, following the announcement that certain bacteria can substitute arsenic for phosphorus. ...Discoverer of Arsenic Bacteria, in the Eye of the Storm, interview by Elizabeth Pennisi, ScienceNow, 20 Dec 2010. Scientists from Arsenic Bacteria Paper Respond to Criticisms by Nancy Atkinson, Universe Today, 16 Dec 2010. Some bacteria can substitute arsenic for phosphorus is our first notice of this story, 2 Dec, with followup, 8 Dec 2010. Bacteria: The Space Colonists is the main related local webpage. Thanks, Larry Klaes. 23 December 2010 Our data support the idea that a primordial xyloglucan-like polymer emerged in streptophyte algae as a pre-adaptation that allowed plants to subsequently colonize terrestrial habitats. This comment comes from two Brazilian geneticists who conducted a detailed phylogenetic analysis of the xyloglucan-related enzymatic machinery in green plants. In cosmic ancestry, genetic programs precede the phenotypic expression of themselves. Therefore, we are not surprised by another example of a genetic program that was apparently available before there was any opportunity on Earth for mutation-and-natural-selection to affect it. But how does darwinism account for "pre-adaptation"?
Luiz Eduardo V Del Bem and Michel GA Vincentz, "Evolution of xyloglucan-related genes in green plants" [abstract], doi:10.1186/1471-2148-10-341, n341 v10, BMC Evolutionary Biology, online 5 Nov 2010. In cosmic ancestry, life can neither originate from nonlife, nor compose genetic programs for higher life forms. Therefore, life must come from the eternal past. In the standard big bang theory, of course, the past is finite, not eternal. Logically, therefore, we must question this limitation of the big bang theory. Fortunately, we are not the only ones with questions about the standard big bang. The authors of the new CCC scenario do not specify how life could persist through a big bang. But they are well-credentialed cosmologists, challenging the prevailing belief that there was only one big bang, with nothing before it. Good. V.G.Gurzadyan and R.Penrose, "Concentric circles in WMAP data may provide evidence of violent pre-Big-Bang activity" [abstract], arXiv:1011.3706v1 [astro-ph.CO], submitted 16 Nov 2010."Going round in circles" [html], The Economist, 2 Dec 2010. "In contradiction to most cosmologists' opinions, two scientists have found evidence that the universe may have existed for ever." "Q&A: Roger Penrose" [html], doi:10.1038/4681039a, p1039 v468, Nature, 23/30 Dec 2010. "...My own fantastical scheme that the entire history of the Universe is just one stage in a succession." Penrose claims to have glimpsed universe before Big Bang, PhysicsWorld.com, 19 Nov 2010. Thanks, Marcy Stone and Bob Lee. The End and the Big Bang is a local webpage with related discussion and links. Comparing Darwinism, Creationism/ID and Cosmic Ancestry is a related local webpage. Rebuttal, 14 Dec | Other Cosmologists..., 20 Dec 2010. Gabriel Manzotti sends some related links, 23 Dec 3010. 11 December 2010 Our results clearly show that class I RNRs [ribonucleotide reductases] have spread to archaea and eukaryotes via transfers from the bacterial domain.... These enzymes are essential for the production of DNA. If the genes for enzynmes so fundamental can be acquired by transfer, we would doubt that any gene is ineligible to be transferred. In cosmic ancestry, horizontal gene transfer (HGT) is the way species acquire new genetic programs. In strict darwinism, HGT is a surprise. Daniel Lundin et al., "Ribonucleotide reduction - horizontal transfer of a required function spans all three domains" [abstract], doi:10.1186/1471-2148-10-383, n383 v10, BMC Evolutionary Biology, 10 Dec 2010. Viruses and Other Gene Transfer Mechanisms is the main related local webpage. What'sNEW about HGT | 8 December 2010
Not everyone is convinced that the arsenate-consuming bacteria gathered from Mono Lake, California, are as different as claimed. Maybe they are merely taking up arsenate and sequestering it in the large vacuoles they contain. It's a great story about adaptation, but it's not ET, says biochemist Gerald Joyce of the Scripps Research Institute in La Jolla CA. So far, the authors of the original paper have not responded.
Alla Katsnelson, "Microbe gets toxic response" [html], doi:10.1038/468741a, p741 v468, Nature, online 7 Dec 2010. 2 December 2010 Some bacteria can substitute arsenic for phosphorus, according to a lab that gathered samples of certain gammaproteobacteria from the bottom of Mono Lake in California and fed them a diet that was depleted in phosphorus. Phosphorus is one of the six elements believed to be absolutely essential for life as we know it, but this diet contained arsenic instead. Although arsenic is chemically similar to phosphorus, it is poisonous to most life. Amazingly, these bacteria were able to survive with little or no phosphorus, apparently by substituting the arsenic for it. We have long been impressed by the range of environments in which bacteria can survive and thrive, but this news startles even us. Life that can live without phosphorus was never observed before now. Others are apparently startled also. For example, Ed Weiler, associate administrator for NASA's Science Mission Directorate said, "The definition of life has just expanded." Indeed, lots of hype accompanies the news, released at a NASA press conference in Washington DC at 2PM EST today. Felisa Wolfe-Simon (pictured) of the NASA Astrobiology Institute and the U.S. Geological Survey was the principle researcher for the project, which also included scientists from Arizona State University, Lawrence Livermore National Laboratory, Duquesne University, and the Stanford Synchroton Radiation Lightsource. We are curious to know several things not explained in the Science article or press releases. For example, can this species survive with absolutely no phosphorus? If not, which biomolecules do, and don't, need phosphorus? How widespread among species is this capability? If phosphorus becomes newly available, do the bacteria revert to it? We will update this news article for a few hours, and post followups. Meanwhile, we now see that some bacteria have another, surprising survival capability.
Felisa Wolfe-Simon et al., "A Bacterium That Can Grow by Using Arsenic Instead of Phosphorus" [abstract], doi:10.1126/science.1197258, Science, online 2 Dec 2010.
Biologist Lum also remarks, "The things that aren't alive in there, their DNA is still preserved." If their genes have no expiration date, could they remain suitable for installation forever? All of this would be consistent with cosmic ancestry.
Researchers kick-start ancient DNA, EurekAlert!, 22 Nov 2010. "It has been known for a long while that random chemical interactions cannot produce the genetic information of the organisms we currently see on Earth.... For example, in a model of the prebiotic Earth with an appropriate complement of amino acids, random molecular interactions over a period of 500 x 10^6 yr would produce only about 194 bits of information.... This is... tiny compared to the 6 x 10^6 bits in a bacterium like E. Coli. The low gain in information I from N trials is because the two things are related by I = log2 N." The writer, astrophysicist Paul S. Wesson of the University of Waterloo, therefore considers panspermia, by logic much like ours: "There are in principle two ways to circumvent this problem. One is that life in fact evolved solely on the Earth, but by some non-random, directed molecular process. The other is that life evolved on the Earth and other planets because they were seeded by biological molecules which already had a large information content. Both of these hypotheses have objections; but in view of the near-inevitability of this process shown above, the second appears to be the more plausible. ...Natural processes do not account for the genomes of observed organisms, basically because of the slow accumulation of genetic information. By contrast, the hypothesis that some information was present at the outset, while it does not solve the problem, certainly alleviates it." He proposes a new name, necropanspermia, for the delivery of valid genetic programs by fragmented or dead cells or viruses: "The version of the standard theory wherein life restarts from technically dead but information-carrying material may be dubbed necropanspermia. It avoids the problem that random chemical processes cannot account for the information encoded in the genomes of even simple Earthly organisms." We have a few technical quibbles with him, for example, when he writes: "The potato spindle tuber viroid is among the smallest, self-replicating pathogens known...." But viruses require whole cells to carry out their replication. Also, "Life is a process that generates information, whereas many other processes generate entropy (misinformation)." Because almost anything can be called "information", the term is often misleading. We would say instead: Life is a phenomenon that requires a special kind of information, encoded programs. No natural process has been clearly shown to generate these. Wesson observes this clearly. Our quibbles are minor compared to our gratitude for his giving panspermia a probing and imaginative analysis. We especially welcome the suggestion that "some information [encoded in the genomes] was present at the outset," a radical idea to almost everyone but us. And he assigns to viruses an even greater role than we do; we thought no one did that! He also discusses in depth the survivability of viable cells, viruses and genomic fragments in space. The complete article is available online.
Paul S. Wesson, "Panspermia, Past and Present: Astrophysical and Biophysical Conditions for the Dissemination of Life in Space" [abstract | 33-page PDF], arXiv.org > astro-ph > arXiv:1011.0101v1, 30 Oct 2010; and [14-page PDF], doi:10.1007/s11214-010-9671-x, Space Science Reviews, online 14 Jul 2010. | ||
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