I been watching proceedings at the Republican National Convention in Florida. If you think it's annoying for most liberal Americans, imagine what it's like for us furriners!
Coincidentally, we watched the last episode of The Newsroom a few days ago then decided to re-watch all ten episodes. It's one of the best shows on television. Makes me sad that The West Wing was cancelled. It's not a show that Republicans will enjoy.
Here's the clip from the first episode that sets the tone for a new kind of TV news show. The hero, Will McAvoy, is a cable news anchor who wants to tell it like it is instead of chasing ratings. The excerpt is from a town hall meeting at Northwestern University. A student has just asked why America is the greatest country in the world. (The student shows up again in Episode #10 when she wants to become a "greater fool.")
Friday, August 31, 2012
Creationist "Science Guys" Respond to Bill Nye
The short video by Bill Nye ("The Science Guy") attracted a lot of attention [Bill Nye: Creationism Is Not Appropriate For Children ].
Not to be outdone, Ken Ham and the Creation Museum have taped a response ...
Not to be outdone, Ken Ham and the Creation Museum have taped a response ...
We are [responding to Nye] today with a video rebuttal featuring our “science guys” — Dr. David Menton and Dr. Georgia Purdom of our AiG and Creation Museum staff. These two PhD scientists were asked to reply to Mr. Nye, whose academic credentials do not come close to Drs. Menton and Purdom.I present this for your amusement. I feel a bit sorry for Georgia Purdom since there's a high probability that some of her grandchildren are going to reject creationism. I wonder how she'll deal with that?
How Could We Have Been So Stupid Back in 1976?
Actually it's not as bizarre as you might think. Lot's of people don't understand the ideas that Dawkins was pushing. He was mostly pointing out that evolution is a phenomenon that takes places at the level of genes and populations. Dawkins tweets that Rafford "gets it" in his review.
Lovely retrospective review of The Selfish Gene by Tim Radford, the Guardian's distinguished science writer. He gets it.Read more »
Thursday, August 30, 2012
What Kind of Knowledge Does Philosophy Discover?
Jerry and I (and many others) have reached the tentative conclusion that much of what passes for modern philosophy is a house of cards. It doesn't tell us anything. It doesn't produce knowledge, or truth.
Read more »
Wednesday, August 29, 2012
Thinking Like an Administrator
In recognition of the need to periodically revisit practices related to the evaluation of teaching, the Course Evaluation Working Group was formed in the Fall 2009 (Appendix B) and was asked to:This sounds like a good idea. As you know, I am very skeptical about student evaluations [On the Significance of Student Evaluations]. It's abut time that universities took a long hard look at the process with a view to abolishing student evaluations or drastically revising them and reviewing their importance in promotion and tenure decisions. It's even more important to revise the policy on using student evaluations to judge the effectiveness of part-time lecturers and teaching assistants. At the very least, their role in determining teaching awards should be critically examined.
- Review current course evaluation practices across the University of Toronto and at peer institutions;
- Review current research on course evaluation policies and practices;
- If necessary, make recommendations to improve existing policies and practices.
If I were in charge of this project I would pick a committee composed almost entirely of the following groups:
- front-line lecturers in introductory classes, including tenured faculty, untenured faculty, full-time lecturers, and part-time lecturers
- teaching assistants (graduate students)
- undergraduates
I would avoid having any administrators on the committee since the purpose of the committee was to evaluate existing university policy. In general, administrators are reluctant to make radical changes and they have trouble thinking outside the box. Furthermore, most of them don't have time to think seriously about the issue.
Administrators think differently than I do. Here's how they constructed the committee (see Course Evaluation Working Group.
- Edith Hillan (Vice-Provost, Faculty and Academic Life; Co-Chair)
- Jill Matus (Vice-Provost, Students; Co-Chair)
- Grant Allen (Vice-Dean, Undergraduate, Faculty of Applied Science and Engineering)
- Gage Averill (Dean and Vice-Principal, Academic, UTM)
- Cleo Boyd (Director, Robert Gilliespie Academic Skills Centre, UTM)
- Corey Goldman (Associate Chair [Undergraduate], Department of Ecology & Evolutionary Biology, Faculty of Arts & Science)
- Pam Gravestock (Associate Director, Centre for Teaching Support & Innovation)
- Emily Greenleaf (Faculty Liaison & Research Associate, Centre for Teaching Support & Innovation)
- Jodi Herold-McIlroy (Wilson Centre, Faculty of Medicine)
- Glen Jones (Associate Dean, Academic, OISE) Helen Lasthiotakis (Director of Academic Programs and Policy)
- Marden Paul (Director, Planning, Governance & Assessment)
- Cheryl Regehr (Vice-Provost, Academic Programs)
- Carol Rolheiser (Director, Centre for Teaching Support & Innovation)
- Jay Rosenfield (Vice-Dean, Undergraduate Medical Education, Faculty of Medicine)
- John Scherk (Vice-Dean, UTSC)
- Elizabeth Smyth (Vice-Dean, Programs, School of Graduate Studies)
- Suzanne Stevenson (Vice-Dean, Teaching & Learning, Faculty of Arts & Science)
That's what thinking like an administrator looks like.
I don't think my university is unusual. We have thousands of very smart students and teachers but all the important committees seem to be composed of people with heavy administrative responsibilities. Does anyone understand the logic here?
Tuesday, August 28, 2012
More Creationist Objections to Unguided Evolution
Sometimes you even see articles that are close to being scientifically correct and I've even seen articles that recognize the existence of modern evolutionary theory (i.e. not Darwinism).
The good articles are still quite rare but I'm encouraged by the fact that they are listening.
The latest contribution is by Stephen A. Batzer, a contributor to Evolution News & Views since May 10, 2012. Batzer has a Ph.D. in Mechanical Engineering (see The Salem Conjecture). He's responding to an earlier post of mine where I attempted to explain to Casey Luskin why he was wrong about evolutionary theory [Is "Unguided" Part of Modern Evolutionary Theory?]. Recall that Luskin was saying that the "unguided" nature of evolution was a core part of the theory of Darwinian evolution.
Read more »
The Flying Spaghetti Monster Steals Meatballs (What's the Purpose of Philosophy?)
As far as I know this is a perfectly valid philosophical argument. If you accept the premises then it's quite possible that meatballs are disappearing from kitchens and restaurants without us ever being aware of the problem.
I'm not a philosopher but I strongly suspect that there aren't any papers on the possible existence of the Flying Spaghetti Monster in the philosophical literature. I doubt that there are any Ph.D. theses on the topic.
Read more »
Monday, August 27, 2012
Monday's Molecule #183
This week's molecule is a lot less complicated although it's rather strange looking. This molecule has a very specific use. Name the molecule—the common name will do—and describe its use.
Post your answers as a comment. I'll hold off releasing any comments for 24 hours. The first one with the correct answer wins. I will only post mostly correct answers to avoid embarrassment. The winner will be treated to a free lunch.
There could be two winners. If the first correct answer isn't from an undergraduate student then I'll select a second winner from those undergraduates who post the correct answer. You will need to identify yourself as an undergraduate in order to win. (Put "undergraduate" at the bottom of your comment.)
Some past winners are from distant lands so their chances of taking up my offer of a free lunch are slim. (That's why I can afford to do this!)
In order to win you must post your correct name. Anonymous and pseudoanonymous commenters can't win the free lunch.
Winners will have to contact me by email to arrange a lunch date. Please try and beat the regular winners. Most of them live far away and I'll never get to take them to lunch. This makes me sad.
UPDATE: The molecule is raltitrexed, also known as Tomudex. It's an inhibitor of the enzyme thymidylate synthase, the enzyme responsible for converting dUMP to dTMP. The drug is effective as an anti-cancer agent since it prevents cell division by blocking DNA synthesis. The winner is Raul A. Félix de Sousa (again).
Winners
Nov. 2009: Jason Oakley, Alex Ling
Oct. 17: Bill Chaney, Roger Fan
Oct. 24: DK
Oct. 31: Joseph C. Somody
Nov. 7: Jason Oakley
Nov. 15: Thomas Ferraro, Vipulan Vigneswaran
Nov. 21: Vipulan Vigneswaran (honorary mention to Raul A. Félix de Sousa)
Nov. 28: Philip Rodger
Dec. 5: 凌嘉誠 (Alex Ling)
Dec. 12: Bill Chaney
Dec. 19: Joseph C. Somody
Jan. 9: Dima Klenchin
Jan. 23: David Schuller
Jan. 30: Peter Monaghan
Feb. 7: Thomas Ferraro, Charles Motraghi
Feb. 13: Joseph C. Somody
March 5: Albi Celaj
March 12: Bill Chaney, Raul A. Félix de Sousa
March 19: no winner
March 26: John Runnels, Raul A. Félix de Sousa
April 2: Sean Ridout
April 9: no winner
April 16: Raul A. Félix de Sousa
April 23: Dima Klenchin, Deena Allan
April 30: Sean Ridout
May 7: Matt McFarlane
May 14: no winner
May 21: no winner
May 29: Mike Hamilton, Dmitri Tchigvintsev
June 4: Bill Chaney, Matt McFarlane
June 18: Raul A. Félix de Sousa
June 25: Raul A. Félix de Sousa
July 2: Raul A. Félix de Sousa
July 16: Sean Ridout, William Grecia
July 23: Raul A. Félix de Sousa
July 30: Bill Chaney and Raul A. Félix de Sousa
Aug. 7: Raul A. Félix de Sousa
Aug. 13: Matt McFarlane
Aug. 20: Stephen Spiro
Aug. 27: Raul A. Félix de Sousa
The Ethics of Genome Analysis
Lots of people are having their genomes sequenced or otherwise analyzed for specific alleles. Those people should get all the information that comes out of the analyses although, hopefully, it will be scientifically correct information and any medical relevance will be explained by experts.1
There's another group of people who submit their genomes for research purposes only and they usually sign consent forms indicating that their name will not be associated with the results. Under those circumstances, the researchers should never have access to the individual's name or any circumstances that are not relevant to the study.
Apparently that simple ethical rule is not always standard practice. Gina Kolatea writes about some ethical issues in the New York Times: Genes Now Tell Doctors Secrets They Can’t Utter.
Here's an example from her article ...
Most of the "ethical problems" in the article are of this type. They involve researchers who are supposed to be concentrating on research and not on the treatment of individual patients. Those researchers have no idea whether the patients already know which alleles they carry or whether they are already undergoing medical treatment. That's just as it should be. If a DNA donor doesn't want to be contacted then it's ethically wrong for the researchers to violate that contract no matter how justified they think they are being. Furthermore, it should be impossible for them to find out the name and address of the donor so the issue should never come up.
John Hawks thinks this is an interesting ethical problem and he wants his students to discuss it in his classes [Grasping the genomic palantir].
There's another group of people who submit their genomes for research purposes only and they usually sign consent forms indicating that their name will not be associated with the results. Under those circumstances, the researchers should never have access to the individual's name or any circumstances that are not relevant to the study.
Apparently that simple ethical rule is not always standard practice. Gina Kolatea writes about some ethical issues in the New York Times: Genes Now Tell Doctors Secrets They Can’t Utter.
Here's an example from her article ...
One of the first cases came a decade ago, just as the new age of genetics was beginning. A young woman with a strong family history of breast and ovarian cancer enrolled in a study trying to find cancer genes that, when mutated, greatly increase the risk of breast cancer. But the woman, terrified by her family history, also intended to have her breasts removed prophylactically.This is a rather simple case of the researchers violating a standard protocol. They should not have known the identity of the patient and they should not have known what she intended to do.
Her consent form said she would not be contacted by the researchers. Consent forms are typically written this way because the purpose of such studies is not to provide medical care but to gain new insights. The researchers are not the patients’ doctors.
But in this case, the researchers happened to know about the woman’s plan, and they also knew that their study indicated that she did not have her family’s breast cancer gene. They were horrified.
Most of the "ethical problems" in the article are of this type. They involve researchers who are supposed to be concentrating on research and not on the treatment of individual patients. Those researchers have no idea whether the patients already know which alleles they carry or whether they are already undergoing medical treatment. That's just as it should be. If a DNA donor doesn't want to be contacted then it's ethically wrong for the researchers to violate that contract no matter how justified they think they are being. Furthermore, it should be impossible for them to find out the name and address of the donor so the issue should never come up.
John Hawks thinks this is an interesting ethical problem and he wants his students to discuss it in his classes [Grasping the genomic palantir].
That case is ethically straightforward compared to others, because the researchers could make a difference to an immediate medical decision. On the other hand, how many risk-free research participants went ahead with prophylactic mastectomies because researchers didn't know about their plans?What will students learn from discussing issues like these? What controls are in place to make sure that students are informed about all the ethical issues? Will they be told that standard scientific protocols were violated once the researchers knew what the patient intended to do?
I think the article will be a good one for prompting student discussions in my courses, and I'll likely assign it widely. But I think the central ethical problem discussed in the article is temporary.
1. "Experts" do NOT include employees of any for-profit company that took money for sequencing the genome.
Thinking Critically About Graphs
Jeff Mahr is trying to teach his students how to think critically so he asked them a question about a graph. Check it out to see if you would pass his course: Clearly Critical Thinking?.
Wednesday, August 22, 2012
For All Those People Who Like to Take Pictures of Their Food Using Their iPhone
You know who you are!
Tomoko Ohta and Nearly Neutral Theory
You should know who she is but in case you don't, here's part of the brief bio ...
In 1973, she presented her first major paper entitled ‘Slightly deleterious mutant substitutions in evolution’. This theory was an expansion of Kimura's ‘neutral theory’, which Ohta called the ‘nearly neutral theory’ of molecular evolution. Her theory emphasizes the importance of interaction of drift and weak selection, and hence the role of slightly deleterious mutations in molecular evolution. With the accumulation of genome data, some of the predictions of the nearly neutral theory have been verified. The theory also provides a mechanism for the evolution of complex systems. Her other subject is to clarify the mechanisms of evolution and variation of multigene families. She has received several honors, including the foreign membership of the National Academy of Sciences, USA and Person of Cultural Merit, Japan.It's very important to understand the essence of Nearly Neutral Theory since it explains the relationship between fitness and population size. Everyone needs to understand that Ohta demonstrated how slightly deleterious alleles can be fixed in a population. Her work showed that an allele can become effectively neutral in small populations even though it may actually lower the fitness of an individual. It's a way of explaining the limits of natural selection and of extending the Neutral Theory of Kimura.
She describes what happened when she joined Kimura's group at Tokyo.
At that time, Kimura was thinking of combining the theory of stochastic population genetics, the field he had been working on, with biochemical data on the nature of the genetic material. He proposed his now famous ‘neutral theory of molecular evolution’ in 1968. The ‘neutral theory’ proposed that most evolutionary changes at the molecular level were caused by random genetic drift rather than by natural selection. Note that the neutral theory classifies new mutations as deleterious, neutral, and advantageous. Under this classification, the rate of mutant substitutions in evolution can be formulated by the stochastic theory of population genetics. Kimura's theory was simple and elegant, yet I was not quite satisfied with it, because I thought that natural selection was not as simple as the mutant classification the neutral theory indicated, and that there would be border-line mutations with very small effects between the classes. I thus went ahead and proposed the nearly neutral theory of molecular evolution in 1973. The theory was not simple, and much more complicated, but to me, more realistic, and I have been working on this problem ever since.This has nothing to do with Darwinism even though it's a fundamental part of modern evolutionary theory. You can't have an intelligent discussion about genome evolution, adaptationism, molecular evolution, or junk DNA without a firm grasp of Nearly Neutral Theory.
It's a shame there's no Nobel Prize for evolution.
Tuesday, August 21, 2012
Designing a New Biochemistry Curriculum
There is a growing acknowledgement that STEM education, at all levels, is not producing learners with a deep understanding of core disciplinary concepts [1]. A number of efforts in STEM education reform have focused on the development of ‘‘student-centered’’ active learning environments, which, while believed to be more effective, have yet to be widely adopted [2]. What has not been nearly as carefully considered, however, is the role of the curriculum itself as perhaps the most persistent obstacle to effective science education. It is now time to examine not only how we teach, but also what we teach and how it affects student learning.This is an important point. Most of the science education reforms that are being proposed these days focus on style rather than substance.
In the long run, it really doesn't matter whether you are employing the very latest pedagogical techniques if what you are teaching is crap.
But we also need to recognize that there's a relationship between what we teach and how we teach it. If you want to teach scientific thinking—as opposed to memorizing pathways—then there may be superior ways to do it.
Recognizing how challenging it is to build scientific understanding requires that we recognize that scientific thinking, in and of itself, is by no means easy and is certainly not ‘‘natural.’’ We are programmed by survival based and eminently practical evolutionary processes to ‘‘think fast’’ [8]. In contrast, scientific thinking is slow, hard, and difficult to maintain. If students are not exposed to environments where they must practice and use the skills (both metacognitive and procedural) that they need to learn, they may fall back on fast, surface level answers, and fail to recognize what it is that they do not understand.Scientific thinking (and critical thinking) have to be experienced and practiced. That means you have to make time for that in your course.
Klymkowsky, M.W. and Cooper, M.M. (2012) Now for the hard part: The path to coherent curricular design. Biochemistry and Molecular Biology Education 40:271–272. [doi: 10.1002/bmb.20614]
Origin Stories
Here's a podcast on the origin of life. Check out the website to see who's talking [Origin Stories].
For some strange reason the show begins with Greek mythology. Then it moves on to real science. There are three origin of life scenarios ...
The second half of the show features soundbites suggesting that the origin of complex organic molecules on Earth is a problem but they could form in interstellar space. But this is exactly the "problem" that Metabolism First tries to explain so it's puzzling that there was no advocate of this view on the show.
This is a complicated topic that is not compatible with the format of this show. How do you, dear readers, think it rates as science journalism? Is this a good way to get the general public interested in science?
The blurb on the website suggests that the series is highly rated by fellow journalists.
For some strange reason the show begins with Greek mythology. Then it moves on to real science. There are three origin of life scenarios ...
- Darwin's warm little pond ... equivalent to primordial soup.
- Panspermia ... which doesn't solve anything.
- Hydrothermal vents ... which aren't explained
The second half of the show features soundbites suggesting that the origin of complex organic molecules on Earth is a problem but they could form in interstellar space. But this is exactly the "problem" that Metabolism First tries to explain so it's puzzling that there was no advocate of this view on the show.
This is a complicated topic that is not compatible with the format of this show. How do you, dear readers, think it rates as science journalism? Is this a good way to get the general public interested in science?
The blurb on the website suggests that the series is highly rated by fellow journalists.
A show that explores the bigger questions. Winner of "Top New Artists" and "Most Licensed by Public Radio Remix" awards at PRX's 2011 Zeitfunk Awards.
Monday, August 20, 2012
Pseudogenes Are Pseudogenes and They Are Almost Always Junk
Naturally, lawyer Casey Luskin is all over this: Paper Rebuffs Assumption that Pseudogenes Are Genetic "Junk," Claims Function Is "Widespread". And just as naturally, the folks at Uncommon Descent (probably lawyer Barry Arrington) jump on the bandwagon: Junk DNA: Yes, paper admits, it WAS thought to be junk.
The authors of the paper, including Templeton Prize winner Francisco J Ayala, claim that pseduogenes exhibit two puzzling properties: (a) similar processed pseudogenes occur in mouse and humans suggesting that they are conserved, and (b) many pseudogenes are transcribed.
Processed pseudogenes arise when mRNA transcripts are reverse transcribed and inserted back into the genome. They usually come from genes that are highly expressed in germ line cells. Such genes tend to be highly conserved in related species. Mammals are closely related on the scale that were talking about. It's not surprising that a few new pseudogenes in such lineages are very similar in sequence. They're still pseudogenes. The vast majority of known pseudogenes are evolving at a rate that approximates the rate of mutation indicating that they are not constrained by negative selection.
Many pseudogenes are derived from gene duplications followed by mutations in one of the copies that make them incapable of producing a functional product. There's no reason to suspect that the first of these debilitating mutations will prevent transcription; therefore, one expects that many pseudogenes will be transcribed.
Some pseudogenes have been co-opted to provide a different function. There aren't very many examples but that doesn't stop the IDiots from making the fantastic leap from 0.0001% to 100%. (Pseudogenes represent about 1% of the genome [What's in Your Genome? ] so even if we assume that every single pseudogene is not a pseudogene, it hardly makes a dint in the amount of junk DNA.)
I discussed all this when I reviewed Jonathan Well's book The Myth of Junk DNA. The relevant chapter is Chapter 5 [Junk & Jonathan: Part 8—Chapter 5]. That review was posted in May 2011. It seems clear that the lawyers on the IDiot websites haven't read it.
Here's what one of them says on Uncommon Descent.
Darwin’s followers considered junk DNA powerful evidence for their theory, which is really a philosophy (often a cult), and that they often expressed that view, often triumphantly. Others insist it is true anyway.I'm not even going to bother pointing out how stupid that is. If you're reading Sandwalk, chances are high that you could detect the lies1 with your eyes closed.
The problem they hope to suppress is that if lots of junk in our DNA is such powerful evidence for their theory, then little junk throws it into doubt. That is, if it is such a good theory, why was it wrong on a point that was announced so triumphantly?
So it is a good thing that the science-minded public is reminded of the historical fact that Darwinism was supported by junk DNA. And it will be fun when the squirming editorials come out in science mags, warning people not to read too much into this, Darwin is still right.
1. Yes, "lies." At this point there's no other explanation.
Wen, Y-Z., Zheng, L-L., Qu, L-H., Ayala, F.J., and Lun, Z-R. (2012) Pseudogenes are not pseudo any more. RNA Biology 9: 27 - 32. [doi: 10.4161/rna.9.1.18277]
Monday's Molecule #182
This week's molecule is one of the most important enzymes in the known universe. What is it?
Post your answers as a comment. I'll hold off releasing any comments for 24 hours. The first one with the correct answer wins. I will only post mostly correct answers to avoid embarrassment. The winner will be treated to a free lunch.
There could be two winners. If the first correct answer isn't from an undergraduate student then I'll select a second winner from those undergraduates who post the correct answer. You will need to identify yourself as an undergraduate in order to win. (Put "undergraduate" at the bottom of your comment.)
Some past winners are from distant lands so their chances of taking up my offer of a free lunch are slim. (That's why I can afford to do this!)
In order to win you must post your correct name. Anonymous and pseudoanonymous commenters can't win the free lunch.
Winners will have to contact me by email to arrange a lunch date. Please try and beat the regular winners. Most of them live far away and I'll never get to take them to lunch. This makes me sad.
UPDATE: The molecule is complex III or ubiquinol:cytochrome c oxidoreductase, the enzyme responsible for the Q-cycle and the transport of proton across the plasma membrane of bacteria and the inner mitochondrial membrane in eukaryotes. This week's winner is Stephen Spiro.
Winners
Nov. 2009: Jason Oakley, Alex Ling
Oct. 17: Bill Chaney, Roger Fan
Oct. 24: DK
Oct. 31: Joseph C. Somody
Nov. 7: Jason Oakley
Nov. 15: Thomas Ferraro, Vipulan Vigneswaran
Nov. 21: Vipulan Vigneswaran (honorary mention to Raul A. Félix de Sousa)
Nov. 28: Philip Rodger
Dec. 5: 凌嘉誠 (Alex Ling)
Dec. 12: Bill Chaney
Dec. 19: Joseph C. Somody
Jan. 9: Dima Klenchin
Jan. 23: David Schuller
Jan. 30: Peter Monaghan
Feb. 7: Thomas Ferraro, Charles Motraghi
Feb. 13: Joseph C. Somody
March 5: Albi Celaj
March 12: Bill Chaney, Raul A. Félix de Sousa
March 19: no winner
March 26: John Runnels, Raul A. Félix de Sousa
April 2: Sean Ridout
April 9: no winner
April 16: Raul A. Félix de Sousa
April 23: Dima Klenchin, Deena Allan
April 30: Sean Ridout
May 7: Matt McFarlane
May 14: no winner
May 21: no winner
May 29: Mike Hamilton, Dmitri Tchigvintsev
June 4: Bill Chaney, Matt McFarlane
June 18: Raul A. Félix de Sousa
June 25: Raul A. Félix de Sousa
July 2: Raul A. Félix de Sousa
July 16: Sean Ridout, William Grecia
July 23: Raul A. Félix de Sousa
July 30: Bill Chaney and Raul A. Félix de Sousa
Aug. 7: Raul A. Félix de Sousa
Aug. 13: Matt McFarlane
Aug. 20: Stephen Spiro
Sunday, August 19, 2012
Green T4 Bacteriophage Earrings
This year it's a sure thing. I worked on bacteriophage T4 as a graduate student and she helped me type my thesis. It's the perfect gift. [NEW - Green T4 Bacteriophage Earrings]
Right?
A Question for Anthropologists
The author is Robert M. Sapolsky, a professor of biology and neurology at Stanford University in California (USA). Stanford is a pretty good school so he probably knows his stuff.
Here's how Sapolsky starts off ...
Sit down with an anthropologist to talk about the nature of humans, and you are likely to hear this chestnut: “Well, you have to remember that 99 percent of human history was spent on the open savanna in small hunter-gatherer bands.” It's a classic cliché of science, and it's true. Indeed, those millions of ancestral years produced many of our hallmark traits—upright walking and big brains, for instance.This doesn't make sense.
Let's assume that our ancestors left Africa only 50,000 years ago. If that represents 1% of our evolutionary history then it means that our species and it's immediate direct ancestors lived on the African open savannah for 4,950,000 years.
Setting aside the "main line," we now have good evidence that modern Homo sapiens acquired alleles from Neanderthals, Denisovans, and, perhaps more ancient Homo erectus. All three spent substantial time evolving in places that looked nothing like the open savannah in Africa. The proportion of the "invading" alleles may be only 10% or less but that's still significant.
Do we know for sure that all of the important features of modern humans came from alleles that were fixed by adaptation on the savannah? What if some of the more important behavioral alleles came from Neanderthals and became fixed because they were so much fitter than the savannah alleles?
Take the alleles that make women like to shop, for example. Maybe they arose in the Denisovans because they have access to better trade routes in central China? Maybe the women on the savannah preferred to store their cash in elephant tusks?
The evolutionary psychologists have developed awesome explanations for human behavior based on their detailed understanding of the social structure of hunter-gatherer groups living on the savannah for millions of years. What if our genetic ancestors lived elsewhere? The bad news is that all those just-so stories will be wrong. The good news is that they can publish a completely different set of stories and get twice as many publications.
Saturday, August 18, 2012
Atheists Have to Address the Social and Emotional Needs of People (or the Church Wins)
Watch the video. Hemant makes the point that large churches in the USA provide a number of social services that, apparently, aren't available anywhere else. He points out that asking someone to give up their religion is asking them to give up all kinds of other things like volunteer groups, daycare, and support groups. Hemant thinks that atheists need to create "churches" that will fill these needs.
This is the same argument made by another prominent American atheist, Dan Dennett [What Should Replace Religion?].
I don't get it. Why should atheists have to form their own "churches"? In Canada these services are provided by local community centres—there are four within a short drive of were I live. The one within walking distance is called South Common Community Centre. It has a swimming pool (see photo above), a public library, many gyms and exercise rooms, and meeting rooms. There's daycare and classes of various sorts, dozens of volunteer organizations and support groups, swimming lessons for adults and children and lots more. The community centres are funded by civic government and paid for by taxes. They are open to everybody.
Some of them rent out space for church services on Sundays but they are definitely secular. They are not atheist centres.
The best way to provide the services that people need has already been invented. It's called socialism. It's wrong to assume that the only solution is competing services supplied by various religious churches plus one non-religious church.
Is it impossible to work in America toward the goal of secular social services for all? Is that why the only solution seems to be for atheists/humanists to form their own competing religion to provide those services for nonbelievers?
Friday, August 17, 2012
What Would Disprove Jerry Coyne's Version of Evolution?
Based on his version of evolution, he then offers some examples of what it would take to disprove evolution.
I was tempted last month to challenge his views but I kept putting it off. Now, Ryan Gregory has done the job, and it's an admirable job.
Please leave comments on Ryan's site.
Disproving Evolution
Here's what I said on Facebook ...
The statement is untrue. If we discover that a given species is older than we thought then we will just revise our view of the history of life on Earth. It will not disprove the fact of evolution and it will have no effect on evolutionary theory. It is a mistake to link the truth of evolution to our current understanding of the history of life. That history can be easily changed without threatening evolution.
Thursday, August 16, 2012
R. Elsiabeth Cornwell Talks About Social Networks
R. Elisabeth Cornwell is Executive Director of the Richard Dawkins Foundation (US). She has a Ph.D. in psychology and her day job is Professor at the University of Colorado at Colorado Springs.
Here's Cornwell giving a talk at TAM2012. It makes me cringe but is it just me? Apparently not if you read the comments at YouTube.
She talks a lot about bullies and their presumed psychiatric problems but she doesn't give any examples. Who is she thinking about? Jonathan Wells? PZ Myers? Margaret Thatcher? Rush Limaugh? Stephen Jay Gould? Jerry Falwell? Ken Miller? Ann Coulter? Christopher Hitchens? Thomas Huxley? Rachel Maddow? Richard Dawkins?
It would have been nice to see the difference between pre-internet "bullies" and those on the internet. Are there any example of people who were "civilized" before they got on the internet but became bullies once they started a blog?
Here's Cornwell giving a talk at TAM2012. It makes me cringe but is it just me? Apparently not if you read the comments at YouTube.
She talks a lot about bullies and their presumed psychiatric problems but she doesn't give any examples. Who is she thinking about? Jonathan Wells? PZ Myers? Margaret Thatcher? Rush Limaugh? Stephen Jay Gould? Jerry Falwell? Ken Miller? Ann Coulter? Christopher Hitchens? Thomas Huxley? Rachel Maddow? Richard Dawkins?
It would have been nice to see the difference between pre-internet "bullies" and those on the internet. Are there any example of people who were "civilized" before they got on the internet but became bullies once they started a blog?
Stipends for Graduate Students
Biochemistry Graduate Student Stipends for 2012-2013
M.Sc. students
Domestic Students
$17,000 living allowance plus tuition ($7,160.00) and incidental fees ($1,241.52) = $25,401.52
International Students
$17,000 living allowance plus tuition ($16,886.00) and incidental fees ($1,241.52) AND UHIP ($684.00) = $35,811.52
Ph.D. students
Domestic Students
$19,000 living allowance plus tuition ($7,160.00) and incidental fees ($1,241.52) = $27,401.52
International Students
$19,000 living allowance plus tuition ($16,886.00) and incidental fees ($1,241.52) AND UHIP ($684.00) = $37,811.52
(UHIP is the University Health Insurance Plan)
My graduate student stipend in 1968 was $3000, which is $19,500 in 2012 dollars. I don't remember how much tuition and the health plan cost. We lived in subsidized housing, The rent was $56 per month.
We have about 140 graduate students in our department. Many of them are in the photo along with several much older "students" who earn a lot more money.
Wednesday, August 15, 2012
Donald E. Nicholson (1916 - 2012)
Nicholson was a professor of biochemistry at the University of Leeds in the United Kingdom. He started drawing metabolic charts back in 1955 and they gradually evolved into the works of art that you have seen in all the textbooks and on the walls of labs in offices in biochemistry departments around the world. I doubt that there's a single biochemist that hasn't studied these charts at some time during their undergraduate experience.
Lately his metabolic charts have been the property of the International Union of Biochemistry and Molecular Biology (IUBMB) but many of them have been marketed by Sigma-Aldrich [Metabolic Pathways].
Recent additions have included several minimaps of specific pathways such as those involved in lipid metabolism, glycolysis, the urea cycle etc. It's sad that we won't see any additions to this collection or any updates.
A Sophisticated Theologian Explains Why You Should Believe in God
Whenever we ask for those "sophisticated" arguments for the existence of god(s) we are directed to various Courtier's Replies discussing how to rationalize the properties of various gods. They all begin with the assumption that god(s) exist. As I pointed out earlier, there's no reason why an atheist should care about things like the problem of evil. It makes about as much sense as debating the cut of the Emperor's new clothes or the stylishness of his new hat.
Alvin Plantinga is one of these "sophisticated" theologians. Listen to him explain why atheists should believe in god(s). Is this really the best they can do?
1. The second most common complaint is that we don't even have good arguments for atheism—at least not as good as those thinkers of the 20th century who were full of angst over not having a god to believe in. Apparently modern atheists aren't very sophisticated unless they are contemplating suicide.
[Hat Tip: Jerry Coyne: Plantinga on why he believes in God, dislikes the New Atheists, and finds naturalism and evolution incompatible.]
Monday, August 13, 2012
Monday's Molecule #181
This week's molecule is a lot more complicated. You need to identify the specific type of molecule. Defective metabolism of this molecule is associated with a famous disease. Name the disease.
Post your answers as a comment. I'll hold off releasing any comments for 24 hours. The first one with the correct answer wins. I will only post mostly correct answers to avoid embarrassment. The winner will be treated to a free lunch.
There could be two winners. If the first correct answer isn't from an undergraduate student then I'll select a second winner from those undergraduates who post the correct answer. You will need to identify yourself as an undergraduate in order to win. (Put "undergraduate" at the bottom of your comment.)
Some past winners are from distant lands so their chances of taking up my offer of a free lunch are slim. (That's why I can afford to do this!)
In order to win you must post your correct name. Anonymous and pseudoanonymous commenters can't win the free lunch.
Winners will have to contact me by email to arrange a lunch date. Please try and beat the regular winners. Most of them live far away and I'll never get to take them to lunch. This makes me sad.
UPDATE: The molecule is ganglioside GM2. Defects in ganglioside synthesis are responsible for a number of genetic diseases in humans including Tay-Sachs disease. This is the same molecule featured in Monday's Molecule #162 back on March 19, 2012. There was no winner that time.
This week's winner is Matt McFarlane, an undergraduate. He lives in Canada but he's quite far away and probably won't make it for lunch.
Winners
Nov. 2009: Jason Oakley, Alex Ling
Oct. 17: Bill Chaney, Roger Fan
Oct. 24: DK
Oct. 31: Joseph C. Somody
Nov. 7: Jason Oakley
Nov. 15: Thomas Ferraro, Vipulan Vigneswaran
Nov. 21: Vipulan Vigneswaran (honorary mention to Raul A. Félix de Sousa)
Nov. 28: Philip Rodger
Dec. 5: 凌嘉誠 (Alex Ling)
Dec. 12: Bill Chaney
Dec. 19: Joseph C. Somody
Jan. 9: Dima Klenchin
Jan. 23: David Schuller
Jan. 30: Peter Monaghan
Feb. 7: Thomas Ferraro, Charles Motraghi
Feb. 13: Joseph C. Somody
March 5: Albi Celaj
March 12: Bill Chaney, Raul A. Félix de Sousa
March 19: no winner
March 26: John Runnels, Raul A. Félix de Sousa
April 2: Sean Ridout
April 9: no winner
April 16: Raul A. Félix de Sousa
April 23: Dima Klenchin, Deena Allan
April 30: Sean Ridout
May 7: Matt McFarlane
May 14: no winner
May 21: no winner
May 29: Mike Hamilton, Dmitri Tchigvintsev
June 4: Bill Chaney, Matt McFarlane
June 18: Raul A. Félix de Sousa
June 25: Raul A. Félix de Sousa
July 2: Raul A. Félix de Sousa
July 16: Sean Ridout, William Grecia
July 23: Raul A. Félix de Sousa
July 30: Bill Chaney and Raul A. Félix de Sousa
Aug. 7: Raul A. Félix de Sousa
Aug. 13: Matt McFarlane
An Example of "Directed" Mutation and an Idiotic "Gotcha"
There's nothing in modern evolutionary theory that allows for mutations that arise specifically because they will produce a future benefit. That's why we say that mutations are "random" with respect to outcome.
There's nothing in the known history of life that suggests it has a purpose or direction. In particular, there's nothing to suggest that 3.5 billion years of evolution were just advanced preparation for the appearance of Home sapiens. That's why we say that evolution appears unguided and purposeless [Is "Unguided" Part of Modern Evolutionary Theory?]. And that's why anyone who says that life shows evidence of purpose is not being scientific.
Creationists aren't happy about this so they will go to extraordinary lengths to wiggle out of the inescapable conclusion based on solid evidence. The usual excuse is to postulate that god is very sneaky. He/she/it makes a huge effort to hide his/her/its manipulations so that it only appears that evolution is unguided and purposeless. The clever creationists aren't fooled by this sneaky god; they can detect its deception, but scientists can't.
Read more »
There's nothing in the known history of life that suggests it has a purpose or direction. In particular, there's nothing to suggest that 3.5 billion years of evolution were just advanced preparation for the appearance of Home sapiens. That's why we say that evolution appears unguided and purposeless [Is "Unguided" Part of Modern Evolutionary Theory?]. And that's why anyone who says that life shows evidence of purpose is not being scientific.
Creationists aren't happy about this so they will go to extraordinary lengths to wiggle out of the inescapable conclusion based on solid evidence. The usual excuse is to postulate that god is very sneaky. He/she/it makes a huge effort to hide his/her/its manipulations so that it only appears that evolution is unguided and purposeless. The clever creationists aren't fooled by this sneaky god; they can detect its deception, but scientists can't.
Read more »
Sunday, August 12, 2012
C.H. Cosgrove, An Ancient Christian Hymn with Musical Notation
CHARLES H. COSGROVE
An Ancient Christian Hymn with Musical Notation
Papyrus Oxyrhynchus 1786: Text and Commentary
In this book, Charles Cosgrove undertakes a comprehensive examination of Papyrus Oxyrhynchus 1786, an ancient Greek Christian hymn dating to the late third century that offers the most ancient surviving example of a notated Christian melody. The author analyzes the text and music of the hymn, situating it in the context of the Greek literary and hymnic tradition, ancient Greek music, early Christian liturgy and devotion, and the social setting of Oxyrhynchus circa 300 C.E. The broad sweep of the commentary touches the interests of classical philologists, specialists in ancient Greek music, church historians, and students of church music history.
Text and Commentary
2011. XI, 232 pages. STAC 65
ISBN 978-3-16-150923-0
sewn paper € 69.00
An Ancient Christian Hymn with Musical Notation
Papyrus Oxyrhynchus 1786: Text and Commentary
Text and Commentary
2011. XI, 232 pages. STAC 65
ISBN 978-3-16-150923-0
sewn paper € 69.00
J.H.F. Dijkstra, Syene I: The Figural and Textual Graffiti from the Temple of Isis at Aswan
25.06.2012;
239 Seiten, mit 36 s/w Tafeln und einer CD; 26,5 x 35cm; Gebunden; Englisch;
ISBN 978-3-8053-4395-4
Saturday, August 11, 2012
Humanities Aren't Science? More's the Pity
Whenever investigators in the humanities discover new knowledge it turns out that they have been using a scientific approach. They've been thinking like a scientist. What else could they be doing?
Maria Konnikova is a graduate student in psychology at Columbia University. She writes in Scientific American that Humanities aren’t a science. Stop treating them like one.
Well, it's certainly true that many disciplines in the humanities are very unscientific—evolutionary psychology comes to mind—but this is one of the first times I've ever heard someone be proud of the fact that they don't think scientifically. Why in the world would she say that?
Turns out she's confused about what science is and what it isn't. She thinks that science requires lots of quantitative data and lots of mathematics and statistics.
Sometimes, there is no easy approach to studying the intricate vagaries that are the human mind and human behavior. Sometimes, we have to be okay with qualitative questions and approaches that, while reliable and valid and experimentally sound, do not lend themselves to an easy linear narrative—or a narrative that has a base in hard science or concrete math and statistics. Psychology is not a natural science. It’s a social science. And it shouldn’t try to be what it’s not.Hmmmm ... that might explain a lot. I guess if you are seeking knowledge in the social sciences it's okay to use a non-scientific approach to gain knowledge. I wonder what approach they follow? Do they pray for guidance? Use a Ouija board? Or do they just make stuff up?
Maybe Konnikova is just saying that humanities disciplines are not chemistry, physics, biology or geology? Nah, that's too obvious. It doesn't merit an article in "Scientific" American. Maybe we'll find out what she really means when her book comes out in January. It's title is: Mastermind: How to Think Like Sherlock Holmes. Did Sherlock Holmes think like a scientist or did he think like someone in the humanities?
[Hat Tip: Mike the Mad Biologist]
Science and Christianity—Different Ways of Finding Truth?
Chris Mulherin is an Anglican Minister who studies the relationship of science and religion. In this video he claims that science and religion are compatible. Specifically, science and Christianity are compatible.
UPDATE: Eric MacDonald does an excellent job of taking down Chris Mulherin in Science and Religion Again!. MacDonald is a former Anglican priest. (Hat Tip: Jerry Coyne.
He doesn't explain how rising from the dead, miracles, souls, heaven, and a Bible full of lies are compatible with science. Instead, he concentrates on the old saw of different magisteria. Christianity answers different questions than science and discovers different truths.
Id' like to echo the challenge I made some years ago and the one Jerry Coyne issues today [Do both science and faith produce truth?]. Can anyone give us an example of a "truth" discovered by religion—one that we all recognize as genuine knowledge? Name a "why" question that religion answers in a way that we all accept as meaningful and true.1
Those who think that science and religion are compatible like to accuse us of not understanding the serious philosophical issues. I don't think that's correct but, if it is, here's a chance for the seriouscourtier theologian to set us straight.
Waiting .....
UPDATE: Eric MacDonald does an excellent job of taking down Chris Mulherin in Science and Religion Again!. MacDonald is a former Anglican priest. (Hat Tip: Jerry Coyne.
He doesn't explain how rising from the dead, miracles, souls, heaven, and a Bible full of lies are compatible with science. Instead, he concentrates on the old saw of different magisteria. Christianity answers different questions than science and discovers different truths.
Id' like to echo the challenge I made some years ago and the one Jerry Coyne issues today [Do both science and faith produce truth?]. Can anyone give us an example of a "truth" discovered by religion—one that we all recognize as genuine knowledge? Name a "why" question that religion answers in a way that we all accept as meaningful and true.1
Those who think that science and religion are compatible like to accuse us of not understanding the serious philosophical issues. I don't think that's correct but, if it is, here's a chance for the serious
Waiting .....
1. It's not good enough to say that if only Christians accept the answer as true, then Christianity has discovered truth. If that were the case then astrology and homeopathy are also valid ways of finding truth even if astologers and homeopaths are the only ones who believe the answers. I'm guessing that no serious philosopher would defend such a ridiculous position.
Is "Unguided" Part of Modern Evolutionary Theory?
An argument we are increasingly hearing from theistic evolutionists is that the "unguided" or "random" aspects of Darwinian evolution are merely "philosophical gloss" or an "add-on" promoted by new atheists who use bad philosophy. Jay Richards covered this question in his recent dialogue with Alvin Plantinga--see here, here, here, and here for the series. While many new atheists undoubtedly make poor philosophers, the "unguided" nature of Darwinian evolution is not a mere metaphysical "add on." Rather, it's a core part of how the theory of Darwinian evolution has been defined by its leading proponents. Unfortunately, even some eminent theistic and intelligent design-friendly philosophers appear unaware of the history and scientific development of neo-Darwinian theory.This is wrong in many ways.
Here's the simple explanation ... so simple that even an IDiot should be able to understand it.
Modern evolutionary theory consists of many parts including the mechanisms of evolution. The main mechanisms are natural selection and random genetic drift and those two mechanisms act on populations containing variation. The variation is due to the presence of mutations and mutations arise "randomly" with respect to ultimate purpose or goal.
There are tons of experiments proving that mutations are essentially random. (Let's not get into quibbling about the meaning of "random.")
Now let's look at the history of life on Earth. This is a completely separate subject from evolutionary theory. It's like the difference between the theory of gravity and how and when our particular solar system formed.
While it is true that evolutionary theory doesn't allow for a "guided" mechanism, it isn't true that the history of life has to be devoid of purpose or guidance. There could well be evidence that god intervened or that particular organisms were preferred over others and the history was tilted in one direction. But there's no evidence that this is the case—with the possible exception of beetles.
The history of life looks exactly like it should if it were the result of accident, contingency, and evolution. There's no evidence of god(s). That's what makes the creationists upset, not evolutionary theory.
Friday, August 10, 2012
Only Young Scientists Overthrow Old Concepts?
Max Planck once said ...
I think that what usually what happens is that a new way of thinking is promoted by well-established investigators. Gradually other scientists are convinced by the evidence to change their minds and the new scientific truth spreads within the community.
When a substantial number of scientists are converted, they start teaching the new concept in graduate and undergraduate courses. This produces a young generation who never heard of the old "truth."
If I'm correct then a new generation of scientists grows up familiar with the new scientific truth but only because the established scientists converted and started training the next generation properly.
When it comes to challenging old established concepts in a discipline I find that initially the younger scientists are often quite conservative unless they just happen to be working on that problem. This shouldn't be a surprise since our young investigators have their hands full just establishing themselves in their field. They don't have time to think about what's going on in the rest of the discipline. In fact, it might be detrimental to their careers to challenge most established concepts.
As I'm writing this I'm having trouble coming up with examples in biology. Most of the conceptual shifts that come to mind are ongoing controversies where it still isn't clear that the new scientific truth will replace the old one. I'm thinking of evo-devo, challenges to evolutionary theory, junk DNA, chemiosmotic theory, metabolism & thermodynamics, the tree of life, photosynthesis, and even new ways of teaching.
Can anyone think of examples were the shift has been completed so we can test the Max Planck hypothesis?
How about the shift from thinking that genes were proteins to genes are DNA?
A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.This does not conform to my experience in the biological sciences.
I think that what usually what happens is that a new way of thinking is promoted by well-established investigators. Gradually other scientists are convinced by the evidence to change their minds and the new scientific truth spreads within the community.
When a substantial number of scientists are converted, they start teaching the new concept in graduate and undergraduate courses. This produces a young generation who never heard of the old "truth."
If I'm correct then a new generation of scientists grows up familiar with the new scientific truth but only because the established scientists converted and started training the next generation properly.
When it comes to challenging old established concepts in a discipline I find that initially the younger scientists are often quite conservative unless they just happen to be working on that problem. This shouldn't be a surprise since our young investigators have their hands full just establishing themselves in their field. They don't have time to think about what's going on in the rest of the discipline. In fact, it might be detrimental to their careers to challenge most established concepts.
As I'm writing this I'm having trouble coming up with examples in biology. Most of the conceptual shifts that come to mind are ongoing controversies where it still isn't clear that the new scientific truth will replace the old one. I'm thinking of evo-devo, challenges to evolutionary theory, junk DNA, chemiosmotic theory, metabolism & thermodynamics, the tree of life, photosynthesis, and even new ways of teaching.
Can anyone think of examples were the shift has been completed so we can test the Max Planck hypothesis?
How about the shift from thinking that genes were proteins to genes are DNA?
Thursday, August 9, 2012
Still Digging: Part II
Ha! You don't know why we call them IDiots!
Here's the latest contribution from
Read more »
Still Digging: Part I
Here's the problem. Jonathan Wells wrote an entire book on The Myth of Junk DNA. Wells says that back in the early 1970s a substantial number of scientists—he calls them Darwinists—said that all noncoding DNA was junk.
Read more »
"Curiosity" Driven Science
Have you been wondering about the scientific mission? The search for life is getting all the publicity but, let's face it, the chances of success are slim.
What about the other missions? Rebecca Ghent of the Dept. of Earth Sciences at the University of Toronto explains why she's interested in the data that "Curiosity" will collect [Curiosity: planetary science and the latest Mars mission].
One of the things I'm interested in is the physical characteristics of planetary regoliths - the surface layer of broken rock, dust, etc., that covers planetary surfaces. It's important to understand how this layer formed and has evolved, because it holds a record of the geological processes that have occurred on each planet. Mars has a very complex surface geological record involving the actions of wind, volcanism, impact cratering, and possibly, water; so this new information about the composition and physical characteristics of the rocks at the Curiosity landing site will provide valuable new insights into the roles of these various processes in forming Mars' surface rocks.For scientists, the best is yet to come. I hope the science journalists can keep the public focused on the real mission and the importance of the data.
Wednesday, August 8, 2012
Charles Darwin at the London 2012 Olympics
Those Brits know what's important! (They also had a picture of some other scientist, I think his name was Isaac.)
[Hat Tip: Ms. Sandwalk]
TED: Alexander Tsiaras, "It was hard not to attribute divinity to it"
Some of you aren't familiar with TED talks so the recent criticism doesn't make sense (e.g. The Trouble with TED). Here's an example of one of the problems with TED talks. This is a "gosh, gee whiz" kind of talk that's almost completely devoid of information.1
The talk has pretty pictures of the developing human embryo/fetus accompanied by the kind of music that evokes mystery and awe. The author of the video talks of the mystery and why it makes him think of divinity.
The first divinity-inspiring observation concerns collagen. Most collagen molecules form fibers (see Collagen) but those in the eye form sheets in the basal lamina. This is because the eye collagen is a different type of collagen. Here's what Wikipedia says [Collagen IV] ...
Would you pay several thousand dollars to hear this TED talk?
The talk has pretty pictures of the developing human embryo/fetus accompanied by the kind of music that evokes mystery and awe. The author of the video talks of the mystery and why it makes him think of divinity.
The first divinity-inspiring observation concerns collagen. Most collagen molecules form fibers (see Collagen) but those in the eye form sheets in the basal lamina. This is because the eye collagen is a different type of collagen. Here's what Wikipedia says [Collagen IV] ...
Type-IV collagen is a type of collagen found primarily in the basal lamina. The type IV collagen C4 domain at the C-terminus is not removed in post-translational processing, and the fibers link head-to-head, rather than in parallel. Also, type-IV lacks the regular glycine in every third residue necessary for the tight, collagen helix. This makes the overall arrangement more sloppy with kinks. These two features cause the collagen to form in a sheet, the form of the basal lamina.Does that make you think of god(s)?
Would you pay several thousand dollars to hear this TED talk?
1. Recall that the theme of TED is "Ideas worth spreading." Which ideas in this talk are worth spreading?
Tuesday, August 7, 2012
Changing Ideas About The Origin Of Life
Here are the main points—but you should read the whole thing.
- Primordial catalysts were probably not proteins nor RNA
- First Energy Source Likely Involved Proton Gradients
- Knowledge of New Bacterial Kingdoms Downplays Role of Fermentation In First Cells
While Miller and his fellow “soupists” blazed the initial paths in origins of life research, a startling new era dawned in the 80s with the discovery of potential life-sustaining factories in the most unlikely environments. The finding that life thrives in deep hydrothermal vents opened a whole new chapter in the field, again avowedly chemical. Black smoker chimneys located miles beneath the ocean have for millions of years been orchestrating a tumultuous union of hot, metal-rich, acidic chemicals arising from volcanic vents with cool alkaline waters. The unholy meeting of these two chemical opposites leads to a violent precipitation of minerals including the silicate mineral olivine, one of the most ubiquitous components of our planet’s rocky landscape. The precipitation of these minerals results in chimney like structures that can be miles high. The convecting thermal currents in these chimneys provide an abundant source of life’s sine qua non – energy. The metals can act as catalysts for simple reactions which involve sulfur, carbon monoxide and water. In recent years, because of the sheer energy hidden inside them, their capacity to catalyze key reactions like the Krebs cycle and concentrate reactants and products in microscopic pores and the uncanny resemblance of some of the iron and sulfur compounds to crucial iron-sulfur cores found in proteins, these mighty smokers have been considered by many scientists to precede or at least accompany the origin of life on the surface. Prominent among the “smokers” are scientists like Nick Lane and the patent attorney Günter Wächterhäuser who moonlights in the field as a “hobby”. These theories provide the “metabolism first” counterpart to the “replication first” camp. Together they may account for both genetic inheritance and chemical metabolism.It doesn't matter whether you're a soupist or a smoker but you'd better be aware of the controversy. Too many scientists think that the primordial soup is still the best, and only, game in town in spite of its severe problems.
Note to David Klinghoffer, When You find Yourself in a Hole, Stop Digging
Rather than simply answer the question, the IDiots circled the wagons then went into attack mode. Eventually, after a lot of pressure, they got around to answering the question; apparently there is no evidence to support their claim [And Finally the Hounding Duck Can Rest].
Of course by then they were so deep in their hole that the sun don't shine.
Read more »
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