Mystery

[Mohit Pandey]

I was passing near an Air Force station where I saw some vehicles often used to carry oil. The curious thing I saw was that " NO naked light within 100 metres" was written on it.

The vehicles were empty as containers on them were open. Iam just wondering what might be inside that was so sensitive.;)

[Thunderbird]

Bio-weapons?

Light-sensitive azides pose problems

 

18 September 2007

 

Organic azides, which have recently become important compounds in organic synthesis, have been found to unexpectedly decompose under light.

Organic azides consist of a carbon chain attached to a row of three nitrogen atoms, and have in recent years become valuable compounds in organic chemistry, not least due to their versatility in reactions, such as the 'click' reaction of azides and alkenes. They have also been used as biochemical labels and as drug components.

Now, a team of bioscientists have found that certain organic azides can decompose when exposed to light. Previously, such decomposition was only known to occur under strong heating or intense ultraviolet irradiation. This could raise issues for the future use of these azides in chemical and biochemical applications, say the researchers.

 

David Fairlie and colleagues at the University of Queensland, Brisbane, Australia, left an azide derivative of an amino acid in a clear glass vial exposed to light, and found that it decomposed at the rate of about one percent a day to give an aldehyde and an amine, which they isolated by chromatography. The aldehyde is known to be much more biologically active than the azide, meaning that even trace amounts could have profound effects, said Fairlie. Summarising, he said that this decomposition has 'very important ramifications for the storage, chemical reactivity, and biological properties of azides'.

Stefan Bräse, professor of organic chemistry at the University of Karlsruhe, Germany, is fascinated by the results. 'Organic azides are always good for surprises,' he said, 'but the discovery that laboratory light might convert azides into bioactive compounds poses both problems and opportunities in the future in biochemistry and chemical biology.'

David Barden

 

http://http://www.emedicine.com/emerg/topic909.htm

 

 

 

 

 

[snoopy]

I was passing near an Air Force station where I saw some vehicles often used to carry oil. The curious thing I saw was that " NO naked light within 100 metres" was written on it.

The vehicles were empty as containers on them were open. Iam just wondering what might be inside that was so sensitive.;)

 

If the containers were empty there would be still vapours from the fuel present and this vapour is easily ignitable more so than if they were full.

 

I dont think it would be bio weapons.

 

Peace

;)

[Qfwfq]

I was passing near an Air Force station where I saw some vehicles often used to carry oil. The curious thing I saw was that " NO naked light within 100 metres" was written on it.

The vehicles were empty as containers on them were open. Iam just wondering what might be inside that was so sensitive.;)

It is a precaution against fire or explosion. As it is a safety measure, they typically establish limits with ample margin; the actual danger depends very much on the breeze too. If the naked flame is exactly downwind in the right kind of gentle breeze, 100 m can even be a quite necessary precaution. Instead of giving so many details and letting the average Joe use his own judgement, they just set a rule for good measure.