Monday, November 24, 2008

Extraodinary Nobelists II: Koichi Tanaka

1. Koichi Tanaka shared the Nobel Prize in Chemistry in 2002 for his contribution in the use of mass spectrometry to analyse biological macromolecules.

2. The unique thing about Tanaka is that he, unlike most Nobel laureates, did not have a Ph.D.. He also did not have formal training in chemistry, unlike most Nobelists. When he won the prize, his age was 43, considered very young given that most Chemistry laureates in the last two decades were considerably older and more experienced.

3. He graduated BS in Electrical Engineering, and worked for Shimadzu Corporation, a reknowned Japanese company that manufactures scientific instruments.

4. From his autobiography on www.nobel.se, one gets an impression that he was not a famous scientist prior to winning the Nobel. Nonetheless, the Nobel committee decided to acknowledge his contributions.

5. One also gets an impression that he never dreamed of winning the Nobel. To me, he seemed like a scientist in the purest sense: hardworking, creative, curious and dedicated to the intellectual knowledge.

6. Scientists are afterall humans, and sometimes seek recognition and fame in addition to the intellectual satisfaction. Koichi Tanaka appeared to be an exception.

7. Disclaimer: I have never met him, but I'd love it if I ever get the chance.

Thursday, November 6, 2008

Extraodinary Nobelists: Robert B Woodward.

1. R.B Woodward was, in my opinion, the smartest chemist of the 20th century. He won the 1965 Nobel Prize in Chemistry for bringing advancement to the field of organic synthesis.

2. He also co-authored with Geoffrey Wilkinson the seminal paper on the structure of ferrocene. Wilkinson went on to win the Nobel in 1973 (with Ernst Otto Fisher) for the work on ferrocene, but Woodward was left out. He complained, to no effect.

3. Woodward is also known for the Woodward-Hoffman rules, which were a unifying theory that governed a class of important reactions, the pericyclic reactions. Hoffman received a Nobel in 1980 (with Kenichi Fukui), but Woodward had passed away.

4. Woodward also worked on the cyclization of squalene oxide, the first step in the biosynthesis of cholesterol. His collaborator Konrad Bloch won the Nobel in Physiology in 1964.

Sunday, October 19, 2008

Natural vs Synthetic Food and Vitamins

1. I noticed that the general public sometimes have a phobia towards the word "synthetic" when it comes to food and vitamins. Perhaps this is the intended result of food companies that over-advertise their products as "natural". Or perhaps the mass media tends to portray synthetic supplements as a negative thing.

2. I'll discuss this topic using menthol as an example. Menthol was first obtained from peppermint, and has found use as the active ingredient or flavor ingredient in cough medicine, chewing gum, and cigarettes.

3. Menthol is a small molecule with 10 carbons, 20 hydrogens and one oxygen. The structure of menthol contains one ring, and three stereogenic centers. Menthol can be synthesized from petroleum-derived material. Presently, menthol is manufactured on a 3000 tonne by Takasago International Co., using the method invented by Ryoji Noyori.

4. What is the difference between peppermint "natural" menthol and Takasago's "synthetic" menthol?

5. To be continued.

Monday, October 6, 2008

Sexism in Science in the 80s: The case of Barbara McClintock


Barbara McClintock won the Nobel Prize in Medicine in 1983, but some historians compared her award to the Francois Jacob's and Jacques Monod's 1965 Nobel Prize in Medicine.

McClintock was awarded "for her discovery of mobile genetic elements", while Jacob and Monod (and Lwoff) were awarded "for their discoveries concerning genetic control of enzyme and virus synthesis"

Although McClintock's work were performed on maize and were published in the 1950s, while Jacob-Monod's work were performed on bacteria (which is academically more popular and important than maize) in the 1960s, the scientific community en masse began noticing the importance and relevance of McClintock's contribution only after Jacob-Monod's discovery. Some historians questioned why McClintock's work had to depend on Jacob-Monod's discovery to gain appreciation and acknowledgements, and suggested that McClintock was a victim of gender discrimination.

McClintock was inducted to the National Women Hall of Fame in 1986, and passed away in 1992 at the age of 90; she never married and never had any children. She was the biographic subject of several writings.

The info for this post were taken from Wikipedia (keyword Barbara McClintock) and the Nobel Foundation (www.nobel.se, keyword McClintock). McClintock's image is taken from the Nobel Foundation.

Ethics in Chemistry: Fradulent cases.

1. These are several actual cases that I can remember. The reader can google the keywords for additional info.

The case of Bengu Sezen vs Dalibor Sames.
The case of G.Buono, brought to light by Scott Denmark.
The case of Imanishi-Kari and David Baltimore.
Hwang Woo-Suk and the much publicized fraudulent cloning experiments.

2. There is a very good fictional story about a fraudulent scientist winning the Nobel Prize, entitled Cantor's Dilemma, written by Carl Djerassi. I recommend this to any interested readers.

3. I write this posting with the following point in mind: science is a noble profession, but scientists are after all humans. Some of them get seduced by the dark side, but most of them are good.

Sunday, October 5, 2008

Chemistry and Mathematics, reversibility, reproducibility, executability.

1. I am a chemist but along my academic journey, I learned some mathematics and simple programming. I love chemistry, but I don't hate mathematics.

2. Chemical operations are usually irreversible; mathematical operations, on the other hand are reversible.

3. Consider the operation of adding sugar to coffee as a representation of a chemical operation. If the chemist made an unintentional mistake and accidentally added salt instead of sugar, then that cup of coffee is pretty much irreversibly ruined, and there is pretty much little or no way to "fix" the mistake. Likewise in a chemical plant, if a mistake happens, then it might not be salvagable. Not all mistakes are unfixable, it all depends on the exact nature of the system.

4. In mathematics, most mistakes are reversible. If one accidentally entered the wrong number into an equation, he or she can simply click the "UNDO" button on his software, and correct his mistake. Even if there is no "UNDO" function, one can SAVE the mistake under a different filename, close the file, and RELOAD the original file.

5. In mathematics, operations are usually if not always reproducible. One can add two numbers 100 times and get the same result everytime. In chemistry, this is only true if a system has been fully optimized.

6. A mathematician wanting to test (execute) his idea usually needs only a computer, software, and access to the literature. An organic chemist wanting to execute (test) his idea needs the whole physical infrastructure-- ingredients, instruments and apparati.

7. The inherent features of chemistry that I described above-- irreversibility, reproducibility, and executability are also reasons that chemistry is unique. One such uniqueness is the possibility of unintentional discovery.

8. James Sumner made a careless irreversible mistake when he unintentionally left a flask of enzyme solution near the window during the winter of 1926, to unexpectedly find that the enzymes crystallized from solution. He went on to win the Chemistry Nobel Prize in 1946

8. Sir Alexander Fleming discovered penicillin, the world's first antibiotic, by accident. It saved the lifes of many Allied soldiers during World War II. The discovery of penicillin is a historical moment in medicine.

9. I write this post to highlight a point: there are two types of science. The first is very logical, reproducible, reversible, predictable and computable. Mathematics and computer programmming belong to this class. The scientists in this group are theoreticians, and deal mostly with ideas and theories.

10. The second type is what I call wet science: where the scientist deal with the physical tangible things. The scientists in this group are experimentalists. They are also logical, but they usually have an intuition about irreproducibility and unpredictability of what they do.

11. Interestingly enough, there is a branch of chemistry called computational chemistry aka theoretical chemistry where the chemist uses a computer to study and predict the behavior of chemicals.

Liquid Helium, NMR and Chemistry

1. Liquid Helium is a very useful material. It is the coldest substance on Earth (~5 Kelvin).

2. One of its uses is to cool superconducting cryomagnets.

3. Cryomagnets are used in Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI)

4. NMR is widely used in qualitative analysis. You can think of it as the chemist's "eye". Using NMR, we can "see" things, without it, we work in the dark.

5. For example, would you know the difference between regular sugar (sucrose), glucose, fructose and aspartame (an artificial sweetener)? If you were to use all five of your senses, would you know the difference?

6. This problem is quite easy if one knows NMR. Of course, chemists use NMR to tackle tougher problems, e.g. to solve the identity of a newly discovered, previously unknown formula of an experimental cancer drug.

7. Without NMR, life is very difficult for the chemist. Without liquid Helium, NMR is useless.

8. A friend once told me a story that the government of Pakistan was given an NMR machine for free in the 1980s. It was the country's first NMR instrument, and previously their chemists had to work in the "dark".

9. However, the NMR sat idly and was not used. The Pakistanis didn't have liquid Helium.

10. Most of us are familiar with Helium GAS, which is used in balloons. Helium GAS is a common industrial chemical, but LIQUID helium is quite troublesome. When shipped from the US to Asia, half of the liquid helium would have evaporated and escaped, according to the same friend.

11. Helium is very light. Once it escapes into the atmosphere, it would leave the planet into outerspace, as it is so light that the Earth's gravity couldn't hold it in the atmosphere. It is not a renewable resource.

12. Helium is obtained from mining. Natural gas sometimes contain a little bit of helium, besides methane and other petroleum gases. United States is the largest supplier of Helium in the world.