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March 31, 2008

A burner by any other name...

In case you didn't know, today is National Bunsen Burner day.* Let the partying begin!!

A celebration of Bunsen's contribution to the scientific lab does beg the question, though (with apologies to Shakespeare): Would a burner by any other name burn as hot? Would it be as useful for melting things in test tubes, or making spotters from pipettes? With more apologies to Bunsen, I'm going to venture a 'yes' on that one, but this could just be because my last Bunsen burner was not very useful (too sensitive to drafts), so I can't imagine how things could get much worse.

On a somewhat related note, when I was in graduate school, we received word that the EPA would be coming through the lab to make sure we were obeying all the rules about proper handling and disposal of chemicals. While of course we were completely in compliance with these rules already, we wanted to be absolutely certain that we were following the EPA guidelines to the fullest extent, in particular in regards to the extent to which things needed to be named (or labeled) throughout the research space. As a result, we spent a fair amount of time labeling anything that had previously escaped our notice, such as chairs ('Chair'), doors ('Door'), walls ('Wall')... you get the idea. In the end, the EPA was very happy with us (and the chemistry department in general). Phew! Actually, the only group on campus that got any significant fines was the art department, who were happily throwing oil-based paint down the drain. Oops...

Anyway, back to the main idea: what are you going to do to celebrate such an exciting holiday? Adjust your Bunsen burner's air vents? Sterilize/dry some flasks? Cook dinner by burner? Let me know if you think up any good ideas.

Catherine (associate editor, Nature Chemical Biology)


* An especially funny quote from the description of the holiday reads:

Spend a few minutes today to appreciate the value of this important scientific tool. We will let you determine how many minutes to spend in reflection.

It's nice that I am allowed to determine my own actions. Thank you, holiday write-up person, for empowering me.

March 28, 2008

Reactions - Phil Gale

1. What made you want to be a chemist?

It was the influence of three people. I went to Gateacre Comprehensive in Liverpool and had an excellent chemistry teacher called Dave Lutner. He was inspirational - I really enjoyed his classes. In those days, health and safety hadn’t taken over the world and we were treated to some fun demonstrations and had the chance to do a fair amount of practical work ourselves. Then, at university in the early 1990s I hadn’t found my niche until I started as an undergraduate student (doing a whole year of full time research) in Paul Beer’s group in Oxford. Paul is a supramolecular chemist and, at the time, was working on bis-crown ether molecules containing bipyridyl groups that could be used to control the conformation of the molecule via coordination to a transition metal. I found the idea that you could think of molecules as molecular machines absolutely fascinating and that was it – I was hooked! I did a PhD for Paul working on calixarene chemistry and then moved on to Jonathan Sessler’s group in Austin, Texas. I was very fortunate both to have the chance to work with Jonathan, who is an inspirational mentor, and to work on a project which resulted in the discovery of an important new class of anion receptor.

2. If you weren’t a chemist and could do any other job, what would it be - and why?

I’ve become increasingly interested in publishing and have had the opportunity to contribute to a number of journals on editorial boards and as editor. I’ve really enjoyed the experience and think it would be an interesting challenge to work full time in science publishing. With the potential rise of open access journals in chemistry and the general proliferation of journals I think the battle ahead will be to maintain quality. I think working towards that would be a really worthwhile goal.

3. How can chemists best contribute to the world at large?

I think chemists already make significant contributions to the world at large but these often go unrecognized by the public. We can fix this by engaging with groups outside the chemistry community – whether they be school children or politicians. We can’t complain that chemistry has a bad reputation amongst the public if we’re not prepared to put some effort into fixing the situation.

4. Which historical figure would you most like to have dinner with - and why?

Adolph von Baeyer – in the latter half of the 19th Century he started a lot of the chemistry that I’ve worked on over my career but without the aid of NMRs, crystal structures and HPLCs etc. I’d like to talk to him about his work and his mentor Kekulé.

5. When was the last time you did an experiment in the lab - and what was it?

If molecular modeling counts, then about three hours ago!

6. If exiled on a desert island, what one book and one CD would you take with you?

As a reminder of my youth, the CD would have to be New Order’s Substance. I’d need a large book for swatting mosquitoes on this island (I’m allergic to them) so I think I’d take the Lord of the Rings which has always been a favourite.

Phil Gale is in the School of Chemistry at the University of Southampton, UK, and works on supramolecular chemistry and particularly the binding, sensing and transport of anionic species.

March 27, 2008

Beating nature to save the planet

It's been a while since I blogged here - apologies. I haven't been neglecting chemistry though - far from it. I've been ferreting away on a feature article, just out in Nature this week.

It's all about trying to find ways to copy the processes in photosynthesis to split water and produce a fuel - hydrogen. Yes yes, I know it is already possible to split water, but the latests efforts have a longer-term goal of finding sustainable, friendly materials to do the job. And it is a lot harder than it might sound.

Nature uses catalysts to drive complex multielectron processes, but exactly what the molecular nature of these catalysts are isn't known. So trying to directly copy them is challenging. And finding a completely different system that works as well, nay, better, is harder still.

A recent paper in Angewandte Chemie has a catalyst that can perform half the job, and impressive it is too, working as it does at room temperature and with reasonable turnovers. But still, it is a tetra ruthenium compound. Not likely to come in as an economic competitor to fossil fuels, unfortunately.

There will be a session at the ACS, organised by UCLA graduate students, called NanoPOWER that will likely address many of the challenges remaining for power, and fuel production. I'm hoping to be there to see what alternatives chemists can offer.

March 25, 2008

Journal journeys: Day 54, Housekeeping

Sorry it's been a while since the last JJ post - recruitment, portal and website issues have conspired to stop me from blogging about Nature Chemistry for a little while... but there are a few things I would like to mention:

1. Nature Chemistry is looking for another associate editor, to be based in Tokyo - here is an excerpt from the job ad:

As part of NPG's expanding publishing programme in chemistry we are now seeking an additional Associate Editor, to be based in our Tokyo office, to work on Nature Chemistry and a number of publishing projects based in the Asia-Pacific region.

2. Nature Chemistry now has a Facebook page. I'm sure that half of the Sceptical Chymist readers have just groaned and the other half have let out some little whoop of joy (I'm just guessing at 50:50, for all I know it could be 99:1). Anyhow, consider it an experiment of some kind - let's see where it goes... why not join and come along for the ride?

3. I will start the obligatory - "Is anyone in blogo-land going to the ACS meeting in New Orleans?" thread. I am, and a few other NPG-types are, and there's always the possibility of a blogger get-together of some sort...

Stuart


Stuart Cantrill (Chief Editor, Nature Chemistry)

March 21, 2008

Reactions - Gary Siuzdak

1. What made you want to be a chemist?

My career in mass spectrometry derived from its practical applications as it is such a diverse technology. This interest primarily comes from my enjoyment of mathematics, innovative physics technology and that mass spectrometry draws these things together allowing it to be applied to many areas of science.

2. If you weren’t a chemist and could do any other job, what would it be - and why?

A coastal surveyor in Alaska from May to August and a carpenter during the off months in Mulege, Baja.

3. How can chemists best contribute to the world at large?

Develop a room temperature, high current capacity, superconductor energy storage device.

4. Which historical figure would you most like to have dinner with - and why?

Luigi Amedeo, Duke of the Abruzzi (adventurer), with what, by our standards would be the crudest traveling means, he explored the world and his own physical existence. Or perhaps Samuel Johnson (English writer) for pure entertainment value.

5. When was the last time you did an experiment in the lab - and what was it?

1999, a set of metabolomics experiments designed, with a visiting high school student, on the effect of Krispy Kreme donuts on skin composition... the changes were very substantial and interesting. Among the many observations, we saw that in some individuals there was a dramatic increase in skin cholesterol almost immediately.

6. If exiled on a desert island, what one book and one CD would you take with you?

The Lesson (book) and the Squirrel Nut Zippers (CD).

Gary Siuzdak is at the Scripps Center for Mass Spectrometry, The Scripps Research Institute, California, and works on developing and applying new mass spectrometry technologies for metabolomics.

March 20, 2008

Chemiotics: The vanishing simplicity of chemical pathways in the cell

Posted on behalf of Retread

So nat'ralists observe, a flea
Hath smaller fleas that on him prey,
And these have smaller fleas that bite 'em,
And so proceed ad infinitum.

– Jonathan Swift

Is anything like this going on in the cell? Consider mitogen activated protein kinase kinase kinase (abbreviated MAPKKK) — shades of Major Major Major in Catch-22. Recall that a kinase is an enzyme which attaches a phosphate group to (phosphorylates) one of the 3 amino acids with hydroxyls on their side chains — serine, threonine and tyrosine. A phosphate ester is formed in the process adding a significant amount of negative charge and some local bulk to the protein (and if the protein is an enzyme often significantly altering its activity).

And what is the target that MAPKKK phosphorylates? Why MAPKK, another kinase which itself phosphorylates MAPK (yet another kinase — I'm not making this up). MAPK phosphorylates a variety of proteins, among them transcription factors which turn on various genes.

All quite linear (sequential) and comprehensible. There is a nice chain of causality from the agent outside the cell (the mitogen) to the receptor for it, to MAPKKK and so on to a particular set of genes whose level of expression is altered with the net result being cellular proliferation (e.g., mitosis).

Discovering this pathway took a lot of hard work on the ras protein, which is mutated in 30% of all cancers. Just the steps from the mitogen binding to its receptor to ras and thence to MAPKKK are quite complex. It was a hard slog, one (linear) step at a time. But what if all this work was like the drunk looking under the street light for his key because that's where the light was. Suppose far more than that is going on.

Instead of teasing out pathways one protein at a time, suppose you just threw a mitogen (in this case epidermal growth factor — EGF ) at a cell (OK, a cancer cell — the Hela cell — the workhorse of cancer research) and looked at every protein to see what was phosphorylated and what was not. Using advanced mass spectroscopy and some other cutting edge techniques [Cell vol. 127 pp. 635–648, 2006] did just that. Some 6,600 distinct phosphorylation sites on 2,244 different proteins were found. 924/6,600 sites showed more than a twofold change in the phosphorylated to unphosphorylated ratio.

In addition, the work was repeated at several time points within 30 minutes of EGF application, allowing the time course of phosphorylation at each site to be determined. The time courses of phosphorylation varied from site to site. Many proteins had more than one site phosphorylation. Even on the same protein the time course of phosphorylation depended on the site studied. At least 46 distinct regulators of gene transcription showed a greater than twofold variation in phosphorylation. It doesn't take much imagination to see that adding a lot of negative charge would alter the ability of a transcription factor to approach DNA (which has one phosphate per nucleotide).

Where this leaves our notion of causality (which really is quite linear) and whether our minds are strong enough to comprehend these events is the subject of the next post.

Retread

March 18, 2008

I've got the whole issue in my hands...

First things first: our April issue is now online. This is (as always, duh) a great one, including a comparison of cryogenic crystals conveying complex and coordinated connectivity in conduits, a synthetic sugar system to screen symptoms of severe sickness, and a pair of protocols to prepare and prove proper Phytophthora products.

We've also included a few photos from our recent symposium, and summarized some of our thoughts from and experiences at the meeting in our editorial this month.

On the topic of scientific gatherings, I thought it might be interesting to hear from you all about conferences you look forward to. For example, in contrast to my recent question about conferences that are a bit scary, what are your favorite conferences, and why? Is it all about the content, or have different ways of getting your daily recommended allowance of science made a big impression on you? What would you most like to do at a conference, if you could plan one yourself? We're in the midst of planning our next symposium, so we'd love to hear any fun ideas you've got tucked away...

Catherine (associate editor, Nature Chemical Biology)

March 14, 2008

Reactions - Tom Welton

1. What made you want to be a chemist?

I only took A-level chemistry because it completed a sensible set of three. Then, the first thing that we learned about was atomic structure. I can remember thinking that this was the most interesting thing that I had ever heard. From then on, I was hooked.

2. If you weren’t a chemist and could do any other job, what would it be - and why?

I had always thought that I would be an aeronautical engineer. I had always loved aeroplanes.

3. How can chemists best contribute to the world at large?

Aside from the obvious contributions in terms of the products of the chemicals industries and understanding how the world works, I think that most chemists are well grounded, practical people who like to proceed on the basis of evidence. These qualities seem to be surprisingly rare in today's world. Keeping these in the public discourse is really important.

4. Which historical figure would you most like to have dinner with - and why?

This is the question that I have found the most difficult to answer. Do you go for someone who has had huge impact on the world, a person of great beauty or famous charm or a damn good comedian? I don't know.

5. When was the last time you did an experiment in the lab - and what was it?

If you mean to have finished an experiment, it's so long in the past that I can't remember. I can remember very clearly when my two most experienced PhD students came to my office one day to speak to me on behalf of the group. They told me that whenever I came into the lab to do some practical work, I left things half completed and that they had no idea of what to do with the mess that I left behind and that I was slowing their progress. So, I stopped.

6. If exiled on a desert island, what one book and one CD would you take with you?

The CD is easy, it would be the complete collection of Round the Horne. I've always quite fancied reading the Mahabharata - at least it's good and long.

Tom Welton is in the Department of Chemistry at Imperial College London and works on the effects of solvent-solute interactions on chemical reactivity, particularly in room-temperature ionic liquids.

March 13, 2008

Materials Girl: Then and now

Posted on behalf of Materials Girl

Freshman year passed in [what is now] a blur. I mostly recall slaving over o-chem labs, studying relentlessly, and pondering a major in chemistry. Adaptation to university life was immediate and painless, apart from coping with the much heightened level of academics.

For instance, semi-brainless writing was an A+ in community college (during high school), while just scratching an A- at the university level. It went from simply using proper grammar and sounding vaguely intelligent, to really having to analyze and think things through to create new ideas. Science and math also seem to follow that route – going from primarily plug & chug on multiple-hour exams to 50 minutes of where-the-hell-did-this-come-from?!

So, returning from the tangent of academic discrepancies, I struggled during the first year of university, but never despaired for longer than a day. If anything, it was always o-chem causing stress...

Speaking of which, upper-division lab begins next quarter and I haven’t dealt with o-chem for over two years – it’s all been inorganic and physical since freshman year. My labwork has barely involved chemicals or spectroscopy, and even less of hot plates, TLC, separatory funnels*, etc... In essence, my doom is waiting around the corner and I’ll be re-studying like a madwoman. What do you consider the main tenets of o-chem book-knowledge and laboratory technique? What should I focus on?

*Granted, after hearing a good number of professors recount horror stories on the misuse of sep funnels, it’s hard to forget, say, shaking one without holding it closed. Still, it sounds terribly amusing to see someone else’s reaction propel a stopper across the room…

March 12, 2008

Chemiotics: The decline of the master gland and the rise of feedback

Posted on behalf of Retread

Endocrinology was pretty simple in med school back in the 60s. All the target endocrine glands (ovary, adrenal, thyroid, etc.) were controlled by the pituitary; a gland about the size of a marble sitting an inch or so directly behind the bridge of your nose. The pituitary released a variety of hormones into the blood (one or more for each target gland) telling the target glands to secrete, and secrete they did. The master gland ruled.

Things became a bit more complicated when it was found that a small (4 grams or so out of 1500) part of the brain called the hypothalamus sitting just above the pituitary was really in control, telling the pituitary what and when to secrete. Subsequently it was found that the hormones secreted by the target glands (ovary, etc.) were getting into the hypothalamus and altering its effects on the pituitary. Estrogen is one example. Any notion of simple control vanished into an ambiguous miasma of setpoints, influences and equilibria. Goodbye linearity and simple notions of causation.

As soon as feedback (or simultaneous influence) enters the picture it becomes like the three body problem in physics, where 3 objects influence each other's motion at the same time by the gravitational force. As John Gribbin (former science writer at Nature and now prolific author) said in his book ‘Deep Simplicity’, "It's important to appreciate, though, that the lack of solutions to the three-body problem is not caused by our human deficiencies as mathematicians; it is built into the laws of mathematics." The physics problem is actually much easier than endocrinology, because we know the exact strength and form of the gravitational force.

Organic chemists dearly love linearity. Nothing is more linear and causal than a multistep synthesis. We always search for conditions producing just what we want in high yield with as few unwanted products as possible, thank you. Le Chatelier's principle is used again and again to force reactions to go just the way we want. It is a type of thinking that will not help us understand what is going on within our cells.

At one time it was thought that we had about 100,000 genes coding for proteins. The best current estimates are around 20,000. These genes code for structural proteins (like those of muscle and bone) and enzymes which do things like metabolize sugar or build the components of structural proteins (amino acids) or of DNA and RNA (nucleotides). We are gradually finding out that a lot of our genes function as controlling elements.

For instance, we have 478 genes for enzymes called kinases which form phosphate esters on the hydroxyls of threonine, serine and tyrosine of proteins, radically altering their function usually (the phosphate group adds a lot of negative charge). We have 107 genes for enzymes (called phosphatases) just for removing the phosphate from tyrosine (never mind serine and threonine). Another 600 or so genes code for enzymes which add (or remove) a small protein called ubiquitin from other proteins. Again feedback, control and nonlinearity.

Where this leaves the notion of causality in the cell, and worse, our ability to comprehend it -- we do think linearly after all -- will be the subject of the next post.

Retread

March 10, 2008

I (don't) believe in miracles

We've decided to have a go at growing some potatoes at home, and so the other week a trip to a garden centre was required in order to get some compost. Two large weighty bags were duly wheeled back to the car, at which point I noticed that printed in the top-left hand corner of each bag was the following declaration:

100% CHEMICAL FREE

Although the bags haven't been opened yet, I'm pretty sure that neither of them contains a perfect vacuum... and that being the case, I think there may be one or two chemicals inside. I won't say which company made the compost, but if you're curious, you may want to look again at the title of this post.

Anyway, here was my chance to post what would surely be an amusing conversation between myself and the customer service hotline at said company. So, I gave them a quick call, left my details and waited for them to phone me back... which they did.

The very helpful and polite gentleman on the other end of the phone answered my first question of, 'So, what exactly are the ingredients in [brand name of compost]?' with a comprehensive list of very 'organicky' sounding things, such as bark, leaf mulch, horse manure, etc... I then asked if any of these ingredients contained any 'chemicals' and it was at this point that my childish hopes of being incredibly sarcastic to some poor unsuspecting soul were shattered.

"Oh, everything contains chemicals," came the response, "me, you, compost, everything. What it should say is 'no synthetic chemicals' - but our marketing department like it to say '100% chemical free', but that's their problem." (He may not have used these exact words, but they were similar).

I was a little disappointed at this point - no fun for me pointing out that even water is a chemical - but at least it did make me think that there is some hope for the human race... and besides, the chemically-aware gentleman went on to give me some great potato-growing advice!

Stuart


Stuart Cantrill (Chief Editor, Nature Chemistry)

March 08, 2008

Sugar Daddy: This chemical reaction was brought to you by...

Posted on behalf of Sugar Daddy

Sorry for my extended absence. I was reading some old posts in the Skeptical Chymist for inspiration for today’s post, and I found one by Catherine that encourages us to name more chemical reactions after people. In the post, she further asks whether we would prefer to have a reaction or a football stadium bear our name. I’d like to take that one step further.

If I discovered a new reaction, I would like to sell the naming rights to a corporation. There are many benefits – good press for the company for supporting basic scientific research, excellent promotion for the inventors of the reaction, and of course, most importantly, a much-needed income supplement for the graduate student inventor so he/she can put food on his/her table. There are some good candidate reaction/company partners already available:

The Henry reaction (“O’Hungry?”)

The Suzuki coupling (“Driving aryl-aryl bond formation since 1979”)

The McMurry coupling (“Would you like a side of TiCl4 with that?”),

The Huisgen [3+2] cycloaddition (“Buy the LEGO “click” kit today!”),

And, of course, the Corey-Bakshi-Shibata reduction (“America’s most-watched enantioselective reduction of ketones to secondary alcohols” – I think that slogan might have to be improved, but it can’t hurt too much – they are already trailing NBC and ABC quite badly in the 6 o’clock news ratings anyway.)

Any further suggestions?

March 07, 2008

The more things change, the more they stay the same...

Just a quick thought:

I was always told that my interest in free food would wane as I moved beyond graduate school. However, our office is closing briefly for remodeling, and they have promised us free pizza today to entertain us while we pack up our stuff. In thinking about whether I could just work from home the entire day, I realized: no, I really want some free pizza. So, here I am at my desk...

Does it ever end? :)

Catherine (associate editor, Nature Chemical Biology)

Reactions - Maurizio Prato

1. What made you want to be a chemist?

When I was a teenager I used to read, rather regularly, the Italian translation of Scientific American and was fascinated by genetics. When the time came to decide where to go, I was recommended, quite wrongly but I realized it only later, to study chemistry, biochemistry and then specialize in genetics. As a matter of fact, I enrolled in chemistry and while studying, I became more and more attracted by organic chemistry until I completely fell in love with this discipline. At that time, I was also strongly influenced by my mentor in organic chemistry, in Padova.

2. If you weren't a chemist and could do any other job, what would it be - and why?

A medical doctor. Understanding how the human machine works always fascinated me. Also, saving lives makes you feel good. But, I am actually very happy to be a chemist and a scientist in general.

3. How can chemists best contribute to the world at large?

Today, the general image of chemistry in the public is totally biased and is mainly associated with pollution. Young people are therefore less and less encouraged to study and develop chemistry and instead are attracted by chemistry-based disciplines, like environmental sciences. However, the contributions of chemistry, from drugs to an infinite number of commodities, have so much improved the quality of our lives that the question of how chemistry contributes to the world at large is actually pleonastic. Maybe, we should be more aware of society-related problems and be ambassadors of the "good" chemistry among the public.

4. Which historical figure would you most like to have dinner with - and why?

The great Greek philosopher Plato. The Greek civilization was one of the most active and influential periods in Western Europe. Much of their behaviour was more pleasant and open-minded than today's lifestyle. Their culture was extremely well-developed, their mathematics very sophisticated - the Platonic Solids, for instance, are amongst the most fascinating geometrical forms for a chemist. In addition, there are many mysterious stories that are described in their books, which we still do not know about. For instance, Plato, in his dialogues Timaeus and Critias, mentions Atlantis, the legendary island, for the first time. Did actually Atlantis exist? Was it really in the Atlantic Ocean? Why did it sink into the ocean?

5. When was the last time you did an experiment in the lab - and what was it?

It was more than 15 years ago, and I cannot remember exactly what it was. At that time I used to carry out cycloaddition reactions, so I tend to believe it was one of these.

6. If exiled on a desert island, what one book and one CD would you take with you?

As a book, I would take The Magic Mountain (or The Enchanted Mountain) by Thomas Mann (original title: Der Zauberberg). The reasons one likes and remembers a book strongly depend on the historical moment of one's life when he/she read it. War and Peace by Leo Tolstoy is another one I was fascinated by when I read it. What I like in these books is the vision of life, not only love and sentiments, but also philosophy, natural sciences, history, etc. They have such an amount of interesting issues that it takes ages to digest everything. In addition to this, I would take a copy of the third act of Die Walküre, by Richard Wagner, which contains an intense and musically unparalleled dialog between Wotan and Brunnhild. I never get tired of listening to it.

Maurizio Prato is in the Dipartimento di Scienze Farmaceutiche at the University of Trieste, Italy, and works on several aspects of synthetic organic chemistry applied to materials science and medicinal chemistry.

March 06, 2008

How to disappear completely

As I promised a couple of weeks ago (where does the time go?), I wanted to ask you all for input on another topic that I think about a lot.

In particular, there is obviously a great group of people who get their Ph.D.s, do postdocs, and then decide that they are crazy enough to dedicate themselves to academia.* These people then have an obvious interest in making themselves/their research known to the external world through publications, websites, conferences, etc., as this is the way they are evaluated for tenure, awards, grants, etc.

However, there is another great group of people who are highly educated and trained, but decide they are not crazy enough to become professors. For simplicity's sake, let's say they all go to industry (to big pharma, small biotechs and start-ups). These people (or their companies), in stark contrast to professors, mostly have a significant interest in not making themselves/their research known to the world. The company websites don’t list contact information. The things that do get published or presented are often projects that failed or are out of date,** or come from the rare companies doing basic research.

This is really frustrating for us because these great minds are basically disappearing into a black hole, even though we would value their input as review writers, referees (particularly when people are claiming to have a new drug or method for drug discovery), or general sources of information. And since there are so many people in industry, it would really broaden our options if we needed an expert in one particular field (where there might be only a couple of professors working on the topic) or if we just want a completely different point of view. Finally, from what I hear, it's also valuable to many industrial people to serve in these writing and refereeing capacities in term of their internal evaluations.

So the question for the day is, how can we find these non-academic scientists?? Sadly, I have no suggestions to kick this one off, so please help!

Catherine (associate editor, Nature Chemical Biology)

*I say this in the kindest way possible. You have to admit, though, it's a little crazy at times...
**And, there’s no guarantee that the person you’re searching for is the corresponding author, and no one else’s contact information is given…

March 05, 2008

Chemiotics: Is math harder than organic chemistry?

Posted on behalf of Retread

The Scandinavian Goddess I had a crush on all through high school could pick up any instrument and play it — piano, clarinet, guitar, saxophone, etc... She didn't think it was a big deal, it was just the way she was. The Hungarian uprising of '56 occurred while I was a freshman in college. A friend who already knew 12 or so languages picked up Hungarian in a week or two and went up to Camp Kilmer in New Jersey to act as a translator for the refugees. It was just something he could do. 50+ years later, the 16 year old high school student auditing an upper level college course in abstract algebra I was taking looked up occasionally from his German homework when the lecturer made an obscure point. He blitzed the course and later went on to college.

I don't think there is anything remotely like that in organic chemistry, although the rumor back then was that Woodward knew all of Beilstein before he hit puberty. Learning organic chemistry always seemed pretty easy and intuitive to me (even now when revisiting it years later). Perhaps it was playing with TinkerToys as a kid. I've found math much, much harder.

In organic chemistry you come to know carbon inside out and at least one atom of it is always present, so you can bring everything you already know (which is quite a bit) to the problem at hand. Math isn't like that at all. You are always bumping up against new definitions, concepts and theorems. Once you get past the plug and chug part of math (use the chain rule n times, integrate by parts m times to find an integral, look for a recursion formula by repeatedly differentiating) you are proving theorems. Here, you must bring everything you know about math to proving the theorem or problem at hand. You may have to create a function, a group, an ideal to solve it, reason by contradiction, think of a counterexample etc., etc...

Is anything like that in organic chemistry? Of course there is. The theorems of organic chemistry are its syntheses. Every reaction you ever heard of comes into play, new ones must be invented, mechanistic pitfalls considered, conditions carefully adjusted etc., etc... You are not asked to synthesize strychnine as a college junior but you start proving theorems in math at that point and never stop. That's why math is harder (to learn).

So math is harder to learn, but organic chemistry and math are equally hard to do. If we really understood mechanism and reactivity, we could just write out the steps and have a robot perform them. We don't because our knowledge is very incomplete. In this sense, organic synthesis is actually harder than math, because in math you are starting with a huge background of solidly proven results which are at your disposal. In chemistry you have a similarly huge background, but there is no guarantee that any of it will work on your particular problem. It's your job to figure out why something which should have worked didn't do so and a way around it as well. That's not easy at all.

Retread

March 04, 2008

Holy science, Batman!

It turns out that today is holy experiment day. Technically, this apparently means that we're supposed to test whether God exists or will reward our desires (perhaps by praying for more places that serve yummy salsa on the East Coast, and then seeing if more appear?). However, a more fun (and nerdy) interpretation refers back to the original Batman series, in which Robin (Batman's sidekick, for you uninitiated) would continually make weird comments of the format 'Holy -insert random word here-, Batman!' Being fairly young when this show was on TV (in reruns), I thought this (and the cheesy 'Pow' and 'Blam' graphics of the fight scenes) was the highlight of the show. So, 'Holy experiment day, Batman!' just screams out to me...

The thing I wondered about is, what might inspire Robin to shout such a thing? Had he perhaps wandered into a giant science fair? Did he mistakenly go to the ACS meeting? Or was he shipwrecked on the island of Dr. Moreau?

On a related note, what's your scariest vision of a collection of scientists? For example, what conferences are you too intimidated to go to, and why?

Catherine (associate editor, Nature Chemical Biology)

CFCs: What is right?

Posted on behalf of Mushy:

One of the reasons which drew me to the physical sciences and maths was the inherent, cold, emotionless objectivity. There was right or wrong; black or white. No matter what my lecturers' views on me, all I ever had to do was write down in an exam what they'd told me in the previous year, and I'd get top marks. Easy as that. Right was right.

Fast forwarding to postgraduate studies, when armed with a clean, fully-assigned NMR and a sensible mass spec, it was a piece of cake to go into a meeting, basking in the warm, hazy glow of certainty that no matter who was in the room, the facts would speak for themselves. I had made what I intended, and woe betide anyone who differs. I was right. The facts were there for anyone to see, criticise, and then ultimately to agree with me. [In truth, none of that happened very much; I was a dreadful synthetic chemist. My NMRs were seldom clean, often shoddily-assigned, and my mass specs mostly laughable. But I digress – that’s all for a later post]. Right—for the most part—was still right.

Fast forwarding further, I found myself in the Big Wide World, and the crutch that had borne the weight of my hubris over the past eight years of university was suddenly whipped from under my shoulder. All of a sudden, right as I needed to be, potentially, it could mean nothing. With a receptive ear further up The Company Hierarchy, my words would be heard, my judgments considered, and my recommendations acted upon. If the ear was less receptive, however, I could find myself in a completely foreign place. I had never before been in the situation where I could prove conclusively that what I was saying was right, that I had a surfeit of evidence, and yet it could mean nothing. No matter what I said, or how I said it; the evidence I produced, or how I produced it, I was completely unable to prove myself right. As a recovering scientist, this was anathema to me. In all honesty, it still is. Gradually, I had to transform from being the analyst I was at university, into the salesman I needed to be in order to get across the ideas which I though were correct. I no longer dealt in cold, emotionless, fact. I was now a purveyor of warm, fuzzy, dangerous perception. Right—all of a sudden—was only what my boss perceived it to be.

Of all the culture shocks to have hit me throughout my slow and ongoing transition from scientist to whatever-it-is-I-do-now, not being able to trust just being right is the greatest, and by orders of magnitude. Being a chemist was—for the most part—great. Working in the City is—for the most part—great. In order to jump between the two, however, it has been necessary to subdue a few of the preconceptions I held dear, and to try to assimilate a whole new bunch of concepts which—useful as they are—are not as black and white.

March 03, 2008

In a spin

Just a quick plug for a new NPG 'Milestones' project headed up by Alison Wright and Andreas Trabesinger at Nature Physics.

In Alison's own words:

Nature Milestones in Spin tells the story of a physical concept that has had remarkable impact in chemistry, biology and medicine as well. The realization that elementary particles possess intrinsic angular momentum, or ‘spin’ has led to revelatory analysis techniques — NMR and MRI — and technological applications such as ‘spintronics’. The supplement is available free online for six months.

Stuart


Stuart Cantrill (Chief Editor, Nature Chemistry)

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