|
A philosopher [i.e., scientist] should be a man willing to listen to every suggestion but determined to judge for himself. He should not be biased by appearances, have no favourite hypothesis, be of no school and in doctrine have no master. He should not be a respecter of persons, but of things. Truth should be his primary object. If to these qualities be added industry, he may indeed hope to walk within the veil of the temple of nature. | |||||||||||||||
| ||||||||||||||||
|
||||||||||||||||
|
Cassini to Rewrite Textbooks on Saturn 06/30/2004 Hundreds of scientists and engineers are waiting with eager anticipation for SOI: Saturn Orbit Insertion, as the schoolbus-sized Cassini spacecraft races for its closest approach to the ringed planet tonight. Just before closest approach, Cassini will fire its main engine for 96 minutes to slow down the spacecraft and allow Saturn to capture it in orbit (see guide to SOI and diagram on the Cassini website). Right after the burn, for about 75 minutes, Cassini will be flying high over the rings at close range. The instruments will gather as many measurements and pictures as it can, because it will never again be this close to the rings or to Saturn. Scientists do not predict that the high-resolution cameras will be able to resolve individual ring particles from this range the best resolution will be about 50 meters per pixel, and most particles are much smaller than 10 but it may detect wakes, waves and streams that will provide clues to the dynamic evolution of ring particles over time. There should be good sample images of all three main rings, C, B, and A, as well as the narrow F ring. After downloading its data during the night, Cassini will point to Titan for its first of 45 encounters. Saturn has already provided Cassinis instruments with a puzzle: the rotation rate appears to be slowing down. According to Cassinis radio and plasma wave detectors, Saturn is rotating about 1% slower than when Voyager made measurements in 1981. (This is determined by timing radio pulses in the planets magnetic field, which is presumed to originate from deep within the fluid planets interior.) Jupiters rotation rate has been rock solid for 50 years of measurements, so why Saturn should show this change is without explanation at this time. The principal investigator for the radio and plasma wave instrument suspects it has something to do with the fact that Saturns polar and magnetic field axes are almost perfectly aligned, to within 0.2 degree a characteristic unique to Saturn. All other planets with magnetic fields show an offset of 10 degrees or more. It is that offset that generates the magnetic dynamo, according to favored models; these models, however, cannot account for a field on an axisymmetric body. How Saturn can have a magnetic field with a negligible offset is a major puzzle Cassini scientists hope to solve. Update Stupendous success! The orbit insertion burn occurred flawlessly. Cassini followed its trajectory exactly as predicted, and then turned to capture the data and images. Relieved scientists and engineers expressed their enthusiasm at the performance of the spacecraft. Now the four-year adventure begins. Some of the first science results will be posted in the July issue as soon as available. We hope to be able to bring you findings and analyses that the media will miss or misinterpret. For instance, the media will always interpret phenomena in terms of the Sacred Parameter A, the age of the solar system (4.5 billion years), a figure invariably assumed without question, even when apparently young phenomena are being observed.Babies Walk in the Womb 06/29/2004 New vivid ultrasound imaging technologies reveal a nursery of activity inside the womb, reports the BBC News. Click the link to see the amazingly clear pictures. Unborn babies have been observed stretching, kicking and leaping from 12 weeks, before the mother is aware, and From 26 weeks, they appear to exhibit a whole range of typical baby behaviour and moods, including scratching, smiling, crying, hiccuping, and sucking, the article states. Until recently it was thought that smiling did not start until six weeks after birth. To think that these cute, innocent, vulnerable human beings, with all their emotions and capabilities, are subject to the most brutal executions is heart-rending. Would not a being able to smile be capable of feeling pain? This technology may be a powerful method to reduce abortions if we can just get people to watch. A plain picture is worth a thousand loaded words.Key to Evolution of Culture Suggested 06/28/2004 Visualize chimpanzees exercising their antics in the jungle: grooming, screeching at one another, chasing off rivals. Now shift the scene to human activities in a large city: fans cheering their team at a stadium, an audience applauding a concert, kids screaming on an amusement park roller coaster, a congregation singing hymns at church, students taking notes in a university classroom, a crowd cheering a speech at a political rally. Darwinians believe a chain of biological events in the genes and in the social interactions of our alleged ape-like ancestors produced capabilities that led to the development of our modern human culture with all its rich and varied accoutrements. Two Spanish researchers publishing in PNAS1 think they know how. They have suggested a key event that must have been the turning point in the evolution of culture among early hominids: the capacity of parents to approve or disapprove of their offsprings behavior. Cultural transmission in our species works most of the time as a cumulative inheritance system allowing members of a group to incorporate behavioral features not only with a positive biological value but sometimes also with a neutral, or even negative, biological value. Most of models of dual inheritance theory and gene-culture coevolution suggest that an increase, either qualitative or quantitative, in the efficiency of imitation is the key factor to explain the transformation of primate social learning in a cumulative cultural system of inheritance as it happens during hominization. We contend that more efficient imitation is necessary but not enough for this transformation to occur and that the key factor enabling such a transformation is that some hominids developed the capacity to approve or disapprove their offsprings learned behavior. This capacity to approve or disapprove offsprings behavior makes learning both less costly and more accurate, and it transformed the hominid culture into a system of cumulative cultural inheritance similar to that of humans, although the system was still prelinguistic in nature.(By negative biological value, they mean that humans sometimes engage in cultural activities that decrease evolutionary fitness for the individual, even though such behaviors might have adaptive value for the group.) It is not clear in an evolutionary sense, the authors admit, how cultural transmission has improved human adaptability, especially when other primates with well developed social learning abilities show comparably restricted ranges. Their interest in the questions of what types of changes occurred during the hominization process that transformed typical social learning in primates into a cumulative cultural inheritance system similar to that of humans and what was the adaptive advantage that made these changes possible formed the basis for their study. They feel that imitation theory of Boyd and Richardson is incomplete. Imitation is a necessary, but not sufficient, ingredient to generate culture, they say, because it does not by itself reward innovative capacity. Their hypothesis adds another ingredient: We suggest that the transformation of primitive hominid social learning, which was probably rather similar to that of todays chimpanzees (i.e., based on indirect social learning mechanisms and rudimentary imitative abilities), into a human cultural transmission system required that our hominid ancestors developed the capacity to approve or disapprove of offsprings learned behavior. Our thesis holds that the simultaneous presence of both capacities in our hominid ancestors, imitation and approval/disapproval of offsprings learned behavior, represented a radical change in the rudimentary cultural transmission of first hominids. Individuals with both abilities, which we call assessors, generated a cultural inheritance system in a strict sense, because by approval/disapproval, they constrained the behavior that offspring incorporated into their repertoire.The offspring has a lower cost of learning by profiting from the parents experience, without having to evaluate all the alternatives. This speeds up adaptation of the learned behavior faster than natural selection can work. The authors provide some differential equations to show that their model works better than the old. But why is the development of culture rare among animals? They answer with explanations of why the emergence of assessors is rare: it is costly to the parent, and also requires the development of a complex brain with symbolic memory, reentrant signaling, a mechanism for categorizing behavior and a strong link between the cortical and limbic systems, among other things. The ability to approve or disapprove of offsprings learned behavior seems completely absent in primates. Probably the evolution of this capacity would require the previous development of the capacity to conceptually categorize learned behavior. The conceptual capacity to categorize is defined as the ability to categorize ones own and others learned behavior in terms of values, i.e., positive or negative, or good or bad.This, they feel, was the beginning of teaching. Experiments show that chimpanzee parents are unable to categorize their offsprings behavior as good or bad when taking the offsprings interest into account. Human children are very sensitive to parental approval, whereas chimpanzee young brought up as human children remain quite wild and troublesome. Because human children are sensitive to approval and disapproval, they are authority acceptors, and have a tendency to accept social influence. The authors feel their hypothesis holds promise for explaining other defining aspects of human social behavior: Finally, it is worth emphasizing that the hypothesis above about the evolution of culture could have interesting implications on the evolution of other typical traits of the human species. For example, we have proposed that conceptual classification of behavior in terms of positive/negative (good/bad) involves, according to its natural origin, a feeling of duty toward those positive behaviors, and this behavioral categorization and the feeling of must are the developmental roots of the ethical capacity. We have also shown that the adaptive advantage that implies the improvement of the assessor cultural transmission could be a key factor in the evolution of language. 1Castro and Toro, The evolution of culture: From primate social learning to human culture, Proceedings of the National Academy of Sciences USA, 10.1073/pnas.0400156101, published online June 24, 2004. Put this one in the basket of quasi-erudite papers that will be laughed at some day when the Darwinian idol collapses. Despite the equations, it is a collage of elitist, ivory-tower, pseudoscientific speculation with a sprinkling of magic to hold it all together. Somehow, somewhere, random mutations appeared on cue to provide symbolic memory, reentrant signaling, a mechanism for categorizing behavior and a strong link between the cortical and limbic systems to allow an ape to express approval to its baby. Maybe a lucky cosmic ray hit Bonzo and the lights went on. He mated and learned to shriek disapproval at his offspring. Simultaneously, the kid got hit with another cosmic ray and understood what disapproval meant. And so a few million years later, Shakespeare emerged.Milky Way Center Bathed in Unexplainably Hot X-Rays 06/25/2004 The Chandra X-Ray Observatory found more heat at the center of the Milky Way than astronomers can explain. Astronomers observed a tiny angle around the Milky Ways center for 170 hours. After subtracting out known sources, a diffuse gas cloud remains that is radiating X-rays at 100 million degrees. Star counts capable of heating the gas are short by an order of magnitude; There is no known class of objects that could account for such a large number of high-energy X-ray sources at the Galactic center, said a co-author of the study released this week. Furthermore, what sustains the cloud is a mystery. Known gravitational sources are insufficient to hold onto this gas, which should have escaped by now. The escape time would be about 10,000 years, a small fraction of the 10-billion-year lifetime of the Galaxy, states the press release. This implies that the gas would have to be continually regenerated and heated. But three suggestions for maintaining this gas at such a high temperature all have problems. Space.Com added, A paper will describe the study in the Sept. 20, 2004 issue of the Astrophysical Journal. Maybe by then somebody will figure out what it means. Since this is a work in progress, any judgments on tentative interpretations would be premature. Its good to discern, however, attempts to force uncooperative data into preconceived notions about time scales and evolutionary theories. That fault is endemic in the biological sciences.Biochemists Mutate Protein, Make a Catalyst 06/25/2004 Enzymes are among the most proficient catalysts known, wrote three Duke University scientists, and they catalyze a wide variety of reactions in aqueous solutions under ambient conditions with exquisite selectivity and stereospecificity. The team set out to rationally design their own enzyme. Their work is reported in the June 25 issue of Science.1 Building on a non-enzymatic ribose-binding protein, they introduced 18 to 22 mutations at specific points, imitating the active site of triose phosphate isomerase (TIM). They succeeded in getting a million-fold increase in catalytic activity, and showed their NovoTim invention to be biologically active in E. coli bacteria. To them, not only does this demonstrate scientists ability to understand and imitate naturally evolved enzymes, but the introduction of TIM activity into RBP is therefore equivalent to convergent evolution by computational design. Their enzyme was less thermally stable than the wild type, however, and the reaction rate was 220 times lower. 1Dwyer, Looger and Hellinga, Computational Design of a Biologically Active Enzyme, Science, Vol 304, Issue 5679, 1967-1971, 25 June 2004, [DOI: 10.1126/science.1098432]. We hate to have to award these clever inventors the Stupid Evolution Quote of the Week prize, but listen to what they said. They just called themselves blind, deaf and dumb. Here they used intelligence, ingenuity, know-how, knowledge, and supervision to design a working enzyme, then said it was equivalent to convergent evolution, a blind, purposeless process that has none of those things. Their work has nothing to do with evolution, convergent, divergent, invergent, subvergent or otherwise. It was an exercise in reverse engineering. By emphasizing the specificity of contact points in a simple enzyme that leads to efficient catalysis, their work underscores the necessity of rational design. How come Charlie keeps getting credit for intelligent design work? Unfair.Angry Evolutionist Seeks to Revive Peppered Moth Story 06/25/2004 Michael Majerus has had it with creationists who leaped onto his 1998 book and used it for ammunition against Darwinism. He had confessed that the simplified textbook story of the peppered moth was inaccurate, but he never meant to cast doubt on evolution. Majerus (U. of Cambridge) is highlighted in a profile in the June 25 issue of Science1 by Fiona Proffitt. He is determined to get to the truth about the peppered moths. Proffitt writes, After a severe drubbing, the famous example of the peppered moth is getting refurbished. Majerus, a researcher in sexual selection and the evolution of melanism (darkening), was among several biologists who began to question the validity of Bernard Kettlewells experiments on light and dark forms of Biston betularia that adorn most biology textbooks as the most famous example of evolution in action. When he stated his reservations about the story, he set off a firestorm: Through his research, Majerus found himself embroiled in the scientific debate over the evolutionary forces behind melanism in the peppered moth. Experiments by British lepidopterist Bernard Kettlewell in the 1950s claimed to show that bird predation, coupled with pollution, was responsible for a color shift in the moth population. But problems with Kettlewells methodology led some scientists to doubt his conclusions. Majerus was not the first to point out the flaws, but by doing so, he inadvertently set off a wave of anti-evolutionist attacks. While acknowledging that Kettlewell made mistakes, Majerus believes Kettlewell was right in his conclusions and has taken it upon himself to prove it.Majerus is making thousands of moth observations with hundreds of thousands of lab-grown moth pupae to test the peppered moth story with better data and procedures. To his credit, he is seeking to really develop a feel for the moths and let them tell their own story, rather than impose a preconceived conclusion on them. Working three years on this project, he is going to great lengths to overcome the procedural errors made by Kettlewell: But doubts emerged over Kettlewells methodology in recent decades as researchers failed to replicate some of his results. His predation experiments were chiefly criticized for their artificiality: He placed the moths on exposed parts of trees in broad daylight, when they dont normally fly, rather than allowing them to settle naturally; he released them in large numbers, thereby inflating moth densities and possibly creating a magnet for predatory birds; and he used a mixture of lab-reared and wild-caught moths without checking to see whether they behaved the same way. Majerus summarized these criticisms in a book on the evolution of melanism in 1998 and stated that the simplified textbook story of the peppered moth was inaccurate, while asserting that Kettlewells conclusions were qualitatively sound. Majerus had no idea at the time what a furor his book would cause.That furor was intensified when Jerry Coyne wrote Nature in 5 November 1998 that for the time being, we must discard Biston as a well-understood example of natural selection in action, although it is clearly a case of evolution.2 Anti-evolutionists were quick to capitalize on this admission. Judith Hooper wrote a scathing account in her book Of Moths and Men, and Jonathan Wells listed it as one of 10 discredited Icons of Evolution in his book. Quoting Coyne and Majerus, creationists have been celebrating the downfall of this highly-touted example of Darwinism, even though they had long criticized its relevance to Darwinian theory. His tedious work on peppered moth ecology has another purpose; ammunition. Majerus is preparing to do battle. His defense is to resuscitate the reputation of Kettlewell; his offense is to disarm those who use doubts about peppered moths to question evolution itself. There is one group he considers particularly dangerous, and he is going to employ his widely-admired communication skill on a lecture circuit: Its a talent Majerus hopes to put to good use in defending the reputation of Kettlewell and the peppered moth in a road show, which he aims to take around Britain--and possibly the United States--later this year. He is motivated by growing concern over attacks on Kettlewells character, most notably writer Judith Hoopers scathing account of the men behind the peppered moth story in her 2002 book Of Moths and Men: The Untold Story of Science and the Peppered Moth, which helped fuel an anti-evolutionist campaign to remove Biston from school textbooks. A lot of [the campaign] is pointed at the peppered moth as being the example that Darwinism is debunked, says Majerus, who wants to make a public stand against teaching creationism and intelligent design in biology classes. To have people believe the biology of the planet is controlled by a Creator, I think thats dangerous.At this stage in his experiments, he has a hunch Kettlewell was right about bird predation being a driver of changes in peppered moth populations, but doesnt feel he has enough data to call it proof. Some of his colleagues think its too labor-intensive a task in light of other worthwhile pursuits. Majerus himself doesnt want to get stuck working on peppered moths all his life, but is determined to get a definite answer on the bird predation issue before taking his message on the road. 1Fiona Proffitt, Michael Majerus Profile: In Defense of Darwin and a Former Icon of Evolution, Science, Vol 304, Issue 5679, 1894-1895, 25 June 2004, [DOI: 10.1126/science.304.5679.1894]. 2For a later opinion by Jerry Coyne, including a link to his 1998 article, see his review of Judith Hoopers book mentioned in the 07/05/2002 headline. Darwinists, for your own good, give it up. Peppered moths are not going to help you. Yes, it was funny when Coyne described hearing the truth about Kettlewells experiments was like finding out that Santa Claus was really his dad. Yes, it was damaging to learn that Kettlewells coworkers glued peppered moths to the trunks of trees for some of the famous photographs. It was Far Side comic book material to find out this most famous example of evolution was based on flawed experiments. All that aside, even if all the experiments had been done perfectly by scientific saints, and even if bird predation actually did shift the populations of moths according to the rise and fall of industrial soot on tree trunks, so what? What does it prove? Both varieties of moths already existed. Both are members of one species, Biston betularia. The only change was in relative numbers of pre-existing dark and light moths. Kettlewells blunders are amusing in hindsight, but they have little to do with the real issue: Nothing evolved. No new structures, organs or abilities emerged. No genetic information was added. Evolutionists need far better evidence than this to convince high schoolers that humans have bacteria ancestors.ID Book Survives Nature Relatively Unscathed 06/24/2004 Considering the intemperate disdain intelligent design books usually receive from the major journals when they are even noticed (see, for example, Natures review of a book by William Dembski in the 07/11/2002 headline) a new ID book fared surprisingly well this week. In Nature1 June 24, Douglas A. Vakoch (SETI Institute) reviewed the new book by Guillermo Gonzalez and Jay Richards, The Privileged Planet (Regnery, 2004).2 This book presents the thesis that earths location seems optimized for both habitability and scientific discovery (measurability). This thesis counters the pessimism of Rare Earth by Ward and Brownlee (see 07/15/2002 headline) by proposing, optimistically, that the earth appears intelligently designed for life. Angry rejection of such a notion would seem the normal response of a member of the SETI Institute, dedicated as it is to the proposition that life is common in the universe due to the almighty power of Darwinian evolution. Maybe Vakoch is just a nice guy, or maybe Nature feels compelled once in awhile to give ID authors a semblance of civility to avoid charges of dogmatism. Or, maybe it reflects a trend. Vakoch straightforwardly summarized the main ideas of the book without ridicule. His only criticisms were that the criteria for measurability appear subjective, and that we dont yet have enough data to determine how rare earth is: So far, Earth is the only planet we know that has the privilege of bearing life that searches for signs of other intelligence whether in the form of other technological beings transmitting evidence of their existence or through patterns indicating underlying design. It may be some time, however, before we can accurately judge whether our blue dot is as planets go commonplace, unique or somewhere in between.Vakoch began and ended his review with a reference to the catch-phrase Pale Blue Dot by the champion of SETI, Carl Sagan, whose book of that name emphasized the ordinariness of earth. Vakoch entitled his review, Bright blue dot without a question mark. 1Douglas A. Vakoch, Bright blue dot, Nature 429, 808 - 809 (24 June 2004); doi:10.1038/429808b. 2Note: a documentary film based on the book is nearing completion and should be available by end of July. Gonzalez and Richards make their case accompanied by an impressive line-up of notable scientists expressing views for and against the privileged status of earth. Its refreshing to see a dispassionate, balanced treatment of a book so outside the Darwinian mainstream. The credentials of the authors cannot be denied, but that has not stopped some reviewers from unleashing venom at anyone daring to publish a science book without the Darwin Party imprimatur guaranteeing absolute and unconditional naturalism (see what Science did to theistic evolutionist Simon Conway Morris, for instance, in the 12/07/2003 headline). Whether more scientists are beginning to acknowledge the merits of ID arguments or not, its too early to tell. (It should be noted that most anthropic arguments have come from secular scientists without any Christian or creationist proclivities whatsoever, such as Brandon Carter, Paul Dirac, and Stephen Hawking.)Spiderman No Match for Real Spider 06/24/2004 National Geographic News took the occasion of the upcoming Spiderman sequel to investigate the superpowers of real spiders. If you were spidy, you could:
According to another spider story posted on National Geographic June 24, scientists are puzzling over why some spiders evolved the ability to spin symmetrical webs. Another species with this ability was recently found in Peru. One researcher from the Smithsonian said, Its interesting because it doesnt make any sense. There doesnt seem to be any advantage to having a symmetrical web, yet it evolved independently among spiders more than once. Its not possible that this is a just random drift in evolution and these spiders are stumbling into the ability to measure things. It must have evolved for a reason, but we dont know what that reason is yet. Spiders deserve more respect than we give them. We usually cant step on them fast enough. OK, so you dont want them in the house. At least live and let live outside, where they do you a lot of good (if you also despise flies). And once in awhile, from a safe distance, take a good, long look at that miniature package of superpowers. Nature is usually more entertaining and thought-provoking than a blockbuster movie. Thats a good thing for a kid to learn.Cleaners Advertise in the Fish Market 06/22/2004 The plot of this science project seems made for Disney animation, a fishy version of Aesops parable of Androcles and the lion. There are fish that will clean parasites out of the mouths and gills of their predators without getting eaten (see 01/13/2003 headline). How these cleaner fish and their clients developed this risky relationship, a classic example of mutualistic symbiosis in which both parties benefit from the transaction, has long been a puzzle. Alexandra S. Grutter (U. of Queensland) decided to do a science project on this phenomenon and published her results in the June 22 issue of Current Biology.1 Observing fish species from the Great Barrier Reef under lab conditions, she observed some interesting behavior that she termed preconflict management strategy. It appears that with a bit of Madison-Avenue advertising skill, cleaners know how to clinch a deal in the fish market. Negotiations and compromises can result in unequal benefits, as in the fable of the contract between the man that needed a fur coat and the bear that needed a meal. In the case of cleaner fish, Grutter showed experimentally that the clients (predators) normally have no qualms about munching on their little dentists. They did eat the cleaner fish in certain situations without remorse. The cleaners also have a natural aversion to swimming right into the mouths of their biggest threats, as seen in the fact that related fish wont come near. The variables in the experiment were: the parasite load on the client, the clients hunger level, the cleaners hunger level, and the cleaners skill at preconflict management strategy. Theres nothing like a little entertainment to break the ice. Cleaner fish have mastered the feel-good commercial: they dance. Grutter observed the cleaner fish approach their dangerous clients with tactile dancing; they oscillate their tail fins and gently rub against the predators gills and body. The client, apparently appeased by this show of good will, says, OK, its a deal, opens its mouth, and both get their satisfaction. The cleaner fish seem to be able to sense when their clients are hungry, and respond by softening them up with more tactile dancing than usual. (The cartoon becomes more entertaining at this point.) But there is still a danger to the little serviceman. Grutter and others have known that client fish will sometimes exhibit posing behavior, posturing themselves in a way that suggests readiness for cleaning. How does the cleaner know it isnt a trap? It would seem the perfect ruse for a hungry predator to lie in wait, saving its energy, advertising itself that it just wants cleaning service, only to clamp its jaws shut on the do-gooders. (See 04/26/2004 story about why animals rarely lie.) Its risky to do business with ones enemies. Most surprisingly, at the end of the cleaning, the client, now in a strength position, makes no effort to take advantage of the easy, gullible snack. How did this mutualism, sometimes termed reciprocal altruism, originate? Grutter takes issue with the typical game theoretic approach (see 02/10/2004 headline). Instead, she views her results supporting another approach: The iterated prisoners dilemma has long been used to explain the evolution of cooperation between unrelated individuals, although some of its limitations have been illustrated with the cleaner fish mutualism. Recently, biological market theory, in which traders exchange goods, services, or both, was proposed as an alternative for understanding cooperation in many systems, including cleaning symbioses. Client ectoparasites and cleaning services are the main goods traded in the cleaner fish market. It takes a skilled salesperson to convince a difficult, dangerous customer that she has a win-win offer thats too good to refuse. A Disney rendition of this story, with a timid yet fast-talking cleaner fish doing its little dance to appease the mean ol predator and get it to open up, is not hard to visualize. And what hey, even tough guys need to see a dentist occasionally. Maybe they fall for the best dancer. 1Alexandra S. Grutter, Cleaner Fish Use Tactile Dancing Behavior as a Preconflict Management Strategy, Current Biology,Vol 14, 1080-1083, 22 June 2004. Personifying a phenomenon with an analogy does not explain its origin. Neither game theory nor market theory provide adequate explanations in Darwinian terms for these interesting behaviors. Fish are not capable of rational thought and market strategy. If not designed, this behavior must be reducible to genetic and developmental factors. If the predators always took advantage of the cleaners, there would be none left, and the phenomenon would disappear. But the present is not the key to the past. Obviously, cleaning symbiosis has survival value for both types of species involved, elaborated Gary Parker, a former evolutionist, in What Is Creation Science? (Master Books, p. 37). But does survival value explain the origin of this special relationship? he asked. Of course not. It makes sense to talk about survival only after a trait or relationship is already in existence.Mystery of the Left-Handed Proteins: Solved? 06/21/2004 Some molecules come in left- and right-handed forms that are mirror images of each other. All biological proteins are composed of only left-handed amino acids. How this could have come about in a primordial soup has long been a puzzle to origin-of-life researchers, since both L (levo, left-handed) and D (dextro, right-handed) forms react indiscriminately. (That biology is single-handed was first noted in the 1800s by Louis Pasteur.) For those familiar with the problem (see online book for background information), a press release from Imperial College, London is sure to draw attention. Its optimistic title proclaims, How left-handed amino acids got ahead: a demonstration of the evolution of biological homochirality in the lab. It refers to a paper in the German journal Angewandte Chemie1 by Blackmond et al., who begin their paper with a review of research on this mystery. (Terms are defined in brackets.) The origin of homochirality [one-handedness] has intrigued scientists ever since the biological importance of L-amino acids and D-sugars was first recognized. Although a theoretical basis for the evolution of high optical activity [purity of one hand rotates polarized light, thus optical activity] from a minute initial imbalance of enantiomers [each hand is an enantiomer of the other hand] was suggested more than half a century ago, experimental proof of such a concept eluded scientists until a remarkable report by Soai and co-workers in 1995. The Soai reaction offered the first, and to date the only, example of an asymmetric autocatalytic reaction employing a catalyst with a very low enantiomeric excess and ultimately yielding the catalyst with a very high enantiomeric excess catalyst as product. While the Soai reaction serves as a mechanistic model for the evolution of homochirality, the dialkylzinc chemistry involved in the reaction is unlikely to have been of importance in an aqueous prebiotic environment. Therefore speculation has continued concerning the types of transformations that might have been directly responsible for the development of high optical activity in biological systems. The area of amino acid catalysis may hold significant clues to the evolution of prebiotic chemistry.The paper presents a three-scheme model describing how, given an initial excess of one hand over the other, the products from a second and a third reaction scheme might act as catalysts, producing more reactants for the first scheme. Here is their model in a nutshell: We report herein a proline-mediated reaction exhibiting an accelerating reaction rate and an amplified, temporally increasing enantiomeric excess of the product. Thus, catalysis with amino acids is implicated in an autoinductive, selectivity-enhancing process, providing the first general chemical strategy for the evolution of biological homochirality from a purely organic origin.This hypothetical self-perpetuating, autocatalytic system might generate an excess of one hand. The resulting purified mixture, if sufficiently isolated, might then contain the ingredients for primitive proteins. They used proline, the fourth-lightest amino acid, for these experiments. A textbook describes it: Proline, a cyclic secondary amino acid, has conformational constraints imposed by the cyclic nature of its pyrrolidine side group, which is unique among the standard amino acids.2 The authors seemed surprised and delighted that the desired reaction sped up. It was what they sought: a process whereby the catalyst is improving over time, as in autocatalytic or autoinductive reactions, in which the reaction product either is itself a catalyst or promotes the formation of a more effective catalyst. To them, the non-linear rate increase was the signature of an autocatalytic reaction that amplified the desired product: Amplification of the enantiomeric excess of the product is a key feature of a chemical rationalization of the evolution of biological homochirality. Despite earlier researchers linear reaction rate curves, that suggested no autocatalytic reaction, they saw a higher than expected rate increase. Rate acceleration and continuous improvement of enantiomeric excess are requisite characteristics for chemical models of the evolution of homochirality from precursors of low optical activity, they noted. Some caveats were mentioned. Cross-reactions of L- and D- reactants had to be prevented, and the environment had to be kept out of equilibrium, or it would have reverted to the mixed-handed (racemic) mixture: However, they speculate, it is important to note that such erosion of enantiomeric excess is predicted only for a closed system such as that occurring in reaction vials in the laboratory. In an open system, in which catalyst and product fluxes can exist across the system boundaries, the chemical propagation mechanism described in Scheme 1 would permit enantiomeric excess to continue to rise. Kinetic amplification of enantiomeric excess as observed in the present studies could be sustained, provided reaction rates between steps in the process are kept in favorable relation to one another, and enough free proline is available as input. One other thing: since proline might condense with itself, it is unknown whether oligomers of proline would lead to enhancement or suppression of the nonlinear effect. Other potentially damaging cross-reactions that might limit the effectiveness of the autocatalytic process are mentioned. Though limited in scope, these experiments lead the authors to believe their work is relevant to a purely mechanistic model for the origin of homochirality: The experimental observation of an unexpectedly high, accelerating reaction rate and an amplified, temporally increasing enantiomeric excess of product in the proline-mediated aminoxylation of aldehydes is consistent with a mechanistic model for a selectivity-enhancing autoinductive process as given in Schemes 1-3. This represents the first example of a purely organic reaction exhibiting characteristics that are key to a chemical rationalization of the evolution of biological homochirality. 1Mathew, Iwamura, and Donna G. Blackmond, Amplification of Enantiomeric Excess in a Proline-Mediated Reaction, Angewandte Chemie International Edition Volume 43, Issue 25, Pages 3317-3321, Published Online: June 21, 2004. 2Vogt and Vogt, Biochemistry 2nd ed., John Wiley & Sons (1995), p. 60. Since evolutionists tend to take an inch and boast a mile, we need to bring out the tape measure to keep speculation in check. In short, under very controlled, hypothetical conditions, one unique amino acid seemed to undergo chemical amplification of one hand. Does this explain the 100% purity of biological proteins? You decide.Stickleback Fish Achieve Stardom in Evolutionary Labs 06/18/2004 According to Elizabeth Pennisi in Science June 18,1 the three-spine stickleback is being studied in 100 labs as a model of evolution. Over the last century, the little fish has been the subject of some 2000 papers, seven textbooks, and a Nobel prize-winning thesis. Evolutionists have been attracted to this fish because it appears to evolve quickly; outward changes have been observed in short time scales, especially as populations migrated from marine to freshwater environments. Some studies have suggested a provocative idea that a little DNAperhaps just a single genecan control many traits that affect an organisms ability to thrive. Maybe this fish, easy to cultivate in the lab and found in a variety of natural environments, can provide evolutionists a genetic basis for rapid speciation: Since the 1930s, the prevailing view has been that evolution moves in a slow shuffle, advancing in small increments, propelled by numerous, minor genetic changes. But some have challenged this dogma, notably H. Allen Orr, an evolutionary biologist at the University of Rochester in New York. In 1992, he and his colleagues argued that just a few genes, perhaps even one, could power long-term change. Such change could rev up speciation. Lately, the Orr camp seems to be gaining ground, in part because of studies of sticklebacks, says R. Craig Albertson, an evolutionary biologist at the Forsyth Institute in Boston. He and others are finding that simple genetic changes can have profound effects.On closer inspection, however, the effects do not appear all that profound, and the genetic bases for them appear to be of questionable value for evolutionary theory. The marine species and the freshwater species supposedly branched apart 22,000 years ago as retreating glaciers trapped some populations in freshwater lakes. Yet the primary differences involve lower numbers of body plates and shorter spines on the more recently-evolved freshwater populations, as well as changes in the shape of the jaw and some other bones. From Pennisis review, here are the observations that are drawing evolutionists to the study of sticklebacks:
Bell hopes that these studies will lure even more developmental, evolutionary, and genetic biologists to the study of these fish. Evolution occurs at many levels, involving modifications of DNA sequence, alterations in development, shifts in behavior, changes in community structure, and, ultimately, survival. Its important to see how these various levels interact during natural selection. Adding molecular genetics studies to stickleback science, he predicts, will allow us to tie up everything in one neat package. 1Elizabeth Pennisi, Evolutionary Biology: Changing a Fishs Bony Armor in the Wink of a Gene, Science, Vol 304, Issue 5678, 1736, 18 June 2004 [DOI: 10.1126/science.304.5678.1736]. Sometimes we have to provide enough detail to prove we are not making this stuff up. If we just summarized this story with an opinion like Evolutionists base their belief in macroevolution on oscillatory changes within one species, someone might question that conclusion. But here it is, mostly in their own words. You just read it yourself. We just highlighted their model organism for evolutionary studies, the one they are proud of and excited about. They are calling all evolutionists to jump on the bandwagon because of the fantastic evidence it provides that humans came from amoebas. And the evidence is? They have demonstrated that some fish lost a few spines and armor plates, and got them right back again when they interbred with their marine relatives. No speciation occurred. Most of the evolution was due not to a genetic change, but a change in the expression of a gene. The genes for loss always mutated the same way in widely-distributed populations. This is not what neo-Darwinism hoped for. Random mutation was supposed to provide the raw material for novelty and innovation, not the same mutation over and over in the same gene. Despite all the hoopla, no novel, innovative feature emerged from all this so-called evolution.Editorial 06/18/2004 Writing in the Los Angeles Times June 17 (see reprint at Discovery Institute), David Klinghoffer claimed secularism is just as religious as any other religion, and is an aggressive religion competing for converts. There is a secular creation account evolution through random mutation and natural selection, a just-so story increasingly challenged by scientists, he wrote, and There is even a flood story, told in the new movie The Day After Tomorrow, wherein a modern-day Noah (played by Dennis Quaid) warns of an impending inundation brought on by global warming. As in biblical tradition, his neighbors pay no attention and subsequently perish. Next headline on: Media Bible and Theology
Comet Surface Wild and Crazy
06/18/2004 1Harold A. Weaver, Not a Rubble Pile? Science, Vol 304, Issue 5678, 1760-1762, 18 June 2004 [DOI: 10.1126/science.1100581]. 2Brownlee et al., Surface of Young Jupiter Family Comet 81P/Wild 2: View from the Stardust Spacecraft, Science, Vol 304, Issue 5678, 1764-1769, 18 June 2004 [DOI: 10.1126/science.1097899]. 3Sweet Dreams Are Made of These, Science, Vol 304, Issue 5678, 1760, 18 June 2004 [DOI: 10.1126/science.304.5678.1760a]. Everyone should be thrilled at the success of this mission of discovery, but it does point out a lesson about scientists. Since scientists know so little about things they can observe, and since they often find contradictions to their expectations, why should we trust any confident-sounding pronouncements about things they cant observe? When they talk about this comet having formed billions of years ago, how can they possibly know that?Fungi Supply Plant Communities With Underground Nutrient Pipeline 06/17/2004 Dig up a cubic yard of soil, and you may have disturbed 12,000 miles of an extensive network of passageways that supply plant roots with carbon, nitrogen, and phosphorus. This highway is made of fungi. Their secret lives in the soil rarely see the light of day, but down in their cryptic, dark, subsurface world, they support most of the thriving plant communities above ground, writes Elizabeth Pennisi in the June 11 issue of Science.1 Once considered pathogens, she begins, microscopic fungi that live in soil are shaping plant communities and aiding efforts in environmental restoration. She tells how scientists are beginning to understand that the above-ground and underground biotas form a network of symbiotic relationships. The thin mycelia (hair-like threads) of fungi, being 1/60th the diameter of roots, are able to wiggle between soil particles and extract minerals; they supply these to the plant roots, which in turn, reward their fungal partners with sugars. Usually these relationships are beneficial to both parties, although some fungi are parasitic (and some plants become freeloaders on underground welfare). Most plants, however, depend on their underground partners in a mutually beneficial way. Long difficult to study because of their cryptic environment and fragility, underground fungi called mycorrhizae are providing scientists with a new paradigm about the complex web of plant life. Pennisi lists some of the new realizations about mycorrhizae:
Furthermore, in contrast to a widely held viewsoil microorganisms arent always harmful. The world of mycorrhizal fungi is cracking wide open, leading ecologists to envision practical benefits that could be gained from understanding these relationships. Scientists are finding, for instance, that adding mycorrhizae to strip mines and toxic waste dumps allows plants to become established again, without the need for polluting fertilizers. Others are working to find the right mycorrhizal mix that will allow endangered species to become reestablished in their native environments. The discovery of this underground highway is changing the way people think about plant ecology. Results of recent investigations that portray fungi as pioneers, providers and protectors are solidifying the idea that the fungi are movers and shakers in the plant world. 1Elizabeth Pennisi, The Secret Life of Fungi, Science, Vol 304, Issue 5677, 1620-1622, 11 June 2004 [DOI: 10.1126/science.304.5677.1620]. The old Darwinian/Malthusian picture of a dog-eat-dog world, nature red in tooth and claw, each species fighting over limited resources for survival of the fittest, just took a beating with this story. This complex web of beneficial interactions looks mighty friendly. You can almost picture the scouts exploring the new territory, the carpenters following behind to build the town and string the telegraph lines and railroad tracks, the sheriff and firefighters setting up headquarters and the settlers moving in to form a thriving, interactive, responsive community all in the silent world of plants. Where Darwinists used to see selfish, harmful microorganisms trying to steal from the land plants, they now see pioneers, providers and protectors.Can Natural Processes Create a Mind? 06/16/2004 No problemo, says H. Clark Barrett (UCLA), getting a mind from mindless matter. In a review of a book by developmental psychologist Gary Marcus published in Science June 11,1 Barrett was reassured by Marcus book that evolutionary theory working within natural law is up to the task: The strengths of The Birth of the Mind lie in its sophisticated exposition of how genes guide development and its convincing argument that we need not hold out hope for some magical, as yet undiscovered, process to account for the brains complexity. Plain old natural processes, about which we know much already, will do. But how can a brain, composed of billions of neurons and quadrillions of connections, arise from a genome with only tens of thousands of genes? Experts have made much of the claim that 30,000 genes arent nearly enough to specify the vast number of connections in the brain (the gene shortage), he notes. The answer is in the book: With clarity and precision, Marcus, a developmental psychologist at New York University, lays to rest the rumors of a gene shortage and also rebuts the argument that minds are too complex to have been designed over evolutionary time by the process of natural selection. He shows instead that minds are built over the course of individual development by genetically regulated processes that have been molded by natural selection to build brains that are functionally organized in ways that promoted human survival and reproduction in the evolutionary past.We need to rise above the simplistic view of genes as static libraries of blueprints, he urges. Instead, we should view genes as active agents that interact in precisely orchestrated ways to build organisms The author shows us how this view allows us to understand the fantastically complex, yet fantastically well-coordinated, generation of the mind. In cognitive science, it has long been customary to think of the brain as a computer. Marcus shows that the developmental system that builds the brain can also be thought of as an algorithmic system, one that operates through frequent interactions with its internal and external environments. He likens the genome to a compressed file, and the cellular machinery with which it interacts to a decompressor. However, this developmental system is full of ingenious devices not typically found in silicon-based computers, including gradients and switches that allow its operations to be context-sensitive, feedback loops, and self-generated test patterns that allow the system to tune itself. ... As Marcus makes clear, although we are vastly more complex than desktop computers and therefore have potentially many more ways of breaking, the fact that our developmental process is relatively far less prone to crashing while booting up from the zygote has everything to do with natural selection for specific developmental outcomes.In addition, the modularity of the brains functions helps address the puzzle of the gene deficit. For example, an animal with 60 legs would not necessarily need 10 times as many genes as a six-legged animal, and although human arms and legs differ considerably, we do not require an entirely distinct set of genes for each type of limb, he explains. Further, gene duplication can provide novelty on which natural selection can act. Barrett praises Marcus for overcoming simple-minded debates about the role of genes and evolution in shaping the human mind, but he does find one weakness in The Birth of the Mind: If there is a drawback to the book, it is that the author doesnt show us exactly how a tiny number of genes builds such a complex brain, only that they can. But he is hardly to blame for this, given that we have a long way to go before we have a complete understanding of brain development. That last sentiment is reinforced in a press release from USC that says, Its amazing that after a hundred years of modern neuroscience research, we still dont know the basic information processing functions of a neuron. 1H. Clark Barrett, Human Cognition: Dispelling Rumors of a Gene Shortage, Science Vol 304, Issue 5677, 1601-1602, 11 June 2004 [DOI: 10.1126/science.1098610]. Lets get this straight. Barrett just admitted that Marcus doesnt show us exactly how a tiny number of genes builds such a complex brain, only that they can i.e., Marcus bluffed his way around a problem by making a bald, unsupported claim. Barrett lets him off the hook for this by saying we have a long way to go before anyone understands brain development. But in the very next sentence, he praises Marcus for making a sophisticated exposition of the case that plain old natural processes are sufficient to account for the brains complexity. I.e., nature built a brain, how we dont know, but my friend Marcus said so.Mars Rovers Enter New Phase of Exploration 06/16/2004 Spirit and Opportunity both still have both spirit and opportunity. Mission scientists said yesterday that the rovers have reached new locations that provide new targets for scientific research; its like starting the missions all over again, they commented. Spirit has reached the Columbia Hills, where it hopes to climb and explore rock outcrops. It has also discovered some of the same nodules and layering seen on the other side of the planet, and some unusual cusps called cobra hoods. Opportunity has made tentative downhill tracks that prove it is safe to enter Endurance Crater. It sees a geological contact ahead that looks interesting. Both rovers, with only minor glitches, are fit as a fiddle and ready to move. Since this is a work in progress, it is premature to draw conclusions; its a time to enjoy the postcards from this vicarious adventure.NASA-Ames Gives Darwin Credit for Antenna Design Project 06/16/2004 A press release from NASA-Ames Research Center claims, NASA Evolutionary Software Automatically Designs Antenna. Using artificial intelligence software, their approach converged on the best design. The article explains: The AI software examined millions of potential antenna designs before settling on a final one, said project lead Jason Lohn, a scientist at NASAs Ames Research Center, located in Californias Silicon Valley. Through a process patterned after Darwins survival of the fittest, the strongest designs survive and the less capable do not.Evolutionary software appears to be more powerful than a speeding engineer: The software also may invent designs that no human designer would ever think of, Lohn asserted. In addition, the software also can plan devices that are smaller, lighter, consume less power, are stronger and more robust among many other things characteristics that spaceflight requires, according to Lohn.The Evolutionary Software project is funded by NASAs Office of Exploration Systems and its Evolvable Systems Group. Here is a teachable moment. This story is full of logical flaws; can your kid find them? Giving Charlie credit for this accomplishment is like giving bin Laden credit for winning the war on terrorism. Charlie is the problem, not the solution; the success of this project was due not to evolution, but to intelligent design.Dinos in the News 06/15/2004 Three dinosaur finds were reported in the last month: |