Helen Mitchell

Essex girl in exile. I draw molecules on whiteboards for a living. "We thank you Lord for the twin pillars of civilization: Christianity and cricket."

[Helen Mitchell @HJMitchell69]

@SagarH62 Kim Hughes?

[Helen Mitchell @HJMitchell69]

@tubemapper Baker Street!

[Helen Mitchell @HJMitchell69]

@SpencerTracyFan This is such wonderful news, Amy! Wishing you and your son every blessing and joy, now and always ❤️

[Helen Mitchell @HJMitchell69]

@tubemapper Of course, it's Newbury Park! What a bus shelter!

[Helen Mitchell @HJMitchell69]

@tubemapper Happy New Year, Luke!

Here's to another year of your fab photos brightening up our kitchen!

[Helen Mitchell @HJMitchell69]

@tubemapper Merry Christmas, Luke!

[Helen Mitchell @HJMitchell69]

This is fab!

[Londonist @Londonist]

Major update to our map of Anglo-Saxon London... we've now added etymologies for each place name... so you can find out what your bit of London used to be called.... and why. (High-res version on link.) https://t.co/ngxyZXCumo

[Mr Benn @thebowlerhatman]

Would you like an early Christmas present?
Would you like these pin badges?
All you have to do is RT this tweet & I will select a winner one week from today.
Good Luck.

[Helen Mitchell @HJMitchell69]

@tubemapper Stratford?

[The Cultured Chemist ⚗️🧐 @CulturedChem]

As #autumn days get shorter and cooler, deciduous leaves break down their green chlorophyll to let other pigments shine! 🍃💨🍂

Reds and purples from anthocyanins like cyanin and its derivatives such as chysanthemin. These molecules also lend their colors to many species of flowering plants. Their colors are adjusted by modifications to the groups substituted on the molecule.

Other reds come from lycopene, familiar as an antioxidant in tomatoes. Many oranges and yellows originate from the same class of molecules called the carotenoids. Xanthophylls like zeaxanthin provide the yellows and beta-carotene gives the oranges (also in carrots and pumpkins).

Get out and experience some leaf chemistry today!

[Helen Mitchell @HJMitchell69]

@DeputyGrocott Yes! According to Just One Thing on Radio 4 last night, taking a nap has a lot of health & cognitive benefits:

https://t.co/bRmZO75KbF

[Helen Mitchell @HJMitchell69]

@bbctms Ravi Bopara has played 235 matches in the #T20Blast and has played every year since the tournament began in 2003.
What a legend!

[Helen Mitchell @HJMitchell69]

@brinatello Happy birthday!!

[Helen Mitchell @HJMitchell69]

@RetirementTales This is wonderful news! Welcome back!!

[Helen Mitchell @HJMitchell69]

@tubemapper Stratford!

[Helen Mitchell @HJMitchell69]

@tubemapper Hatton Cross

[Helen Mitchell @HJMitchell69]

@DimensionsInJen @sharintaint @Loribzzz The ratings in Tom Baker's last season were also poor. People preferred to watch ITV's new US import Buck Rogers instead. The BBC responded by casting a younger actor (with dyed blond hair), moving away from the Saturday teatime slot & having 3 companions in the TARDIS...

[Helen Mitchell @HJMitchell69]

@BBCSteveR Bravo, Steve!

[The Cultured Chemist ⚗️🧐 @CulturedChem]

Eighteen(!!)-year-old William Henry Perkin, born #OnThisDay in 1838 (Mar 12), accidentally synthesized the first commercial organic synthetic dye while attempting to make quinine from coal tars. #chemistry

The procedure for mauveine, its name originating from the French for the mallow flower, was fairly simple. An acidic mixture of aniline, o-toluidine, and p-toluidine are oxidized to a bright purple solution of a mixture of dye molecules.

His discovery caused an explosion of new dyes that revolutionized the fashion and synthetic organic chemistry industries. In his honor, two journals and a medal of the Royal Society have been named after him.

Follow for more of the human side chemistry and science ⚗️🧐

Painting credit:
William Henry Perkin - Pioneer in Synthetic Organic Dyes
Jerry Alison

[Helen Mitchell @HJMitchell69]

@tubemapper @FionaFeyMusic What a fabulous photo!
Thank you!!