Posts Tagged ‘tweet’

The Thermodynamic Sinks of this World » American Scientist

Wednesday, June 26th, 2013

Thermodynamic sinks: oxides, alkaline cation + molecular anion, fluorides, dissolved salts #chemistry
by Nobel Laureate Roald Hoffmann

Let’s use some simple chemistry to get a feeling for the thermodynamic sinks of this world. …. Here is the first principle of stability, one we have already seen in the reaction forming water: Form oxides. ….The prescription is obvious: Form oxides, form solid state, ionic compounds. The elements don’t stand a chance, except for the early noble gases …. one finds that all carbonates are very stable, as are most salts containing nitrate (NO3-), sulfate (SO42-), phosphate (PO43-) and silicate ions…..
There is a pattern emerging in the nature of the more stable compounds: It’s not simply ionic bonding (Na+Cl-, Li+H-), but ionic bonding between an alkali or alkaline earth cation and a molecular anion (CO32-, SiO44-). Of course, within each molecular ion there lurks ionicity… Ions within ions!
But there are compounds more stable than oxides, and these are fluorides—for example, CaF2, fluorite, or Na3AlF3, cryolite. In these even more ionicity is provided than in oxides. ….
Also, in the temperature range where water is a liquid, a good number of salts, hardly all, dissolve in water with a negative Gibbs energy of solution….
So my tentative answer to the question posed at the beginning is not romantic. The final product (at P = 1 atmosphere and 298 kelvin) will be a messy soup of cations of the less electronegative elements (including the transition metals) with molecular anions, in water. “

The Scientific 7-Minute Workout –

Tuesday, June 25th, 2013 MT @herstoryhere The Scientific 7-Minute Workout But how long to warmup and cooldown? #exercise

The Obama Campaign’s Digital Masterminds Cash In –

Monday, June 24th, 2013

But there was the potentially politically explosive matter of privacy. Unlike Facebook, where users were at least giving the campaign explicit permission to collect personal data even if they had not read the fine print, television watchers were making no such agreement. To address this, the campaign and Rentrak hired a third party to “anonymize” the data so that they would only know that the information was coming from a set-top box of somebody on the persuadable list; identifying information would be stripped away.

What if they didn’t hire a 3rd party ? Is this something the government can do ?

Determine who the swing voters are & what they’re watching, so you can target pol ads. Impressive mining but a little scary from privacy perspective

Find swing voters & what they watch to target pol ads. Impressive #mining but a little #privacy scary

N.S.A. Leak Puts Focus on System Administrators –

Monday, June 24th, 2013

Can IT staff be trusted ? MT @nytimes: N.S.A. Leak Puts Focus on System Administrators Say Hello to the 100 Trillion Bacteria That Make Up Your Microbiome

Friday, June 21st, 2013 Say Hello to the 100 Trillion Bacteria That Make Up Your Microbiome BY MICHAEL POLLAN
Medicine used to be obsessed with eradicating the tiny bugs that live within us. Now we?re beginning to understand all the ways they keep us healthy.
Our processed-food diets just feed the upper GI via @kellynicola: M POLLAN on the microbiome #health

Leave the Driving to It » American Scientist

Thursday, June 20th, 2013 Sketches an incredible future of computer-aided driving where the daily commute includes a nap! #driving

Mutational heterogeneity in cancer and the search for new cancer-associated genes : Nature : Nature Publishing Group

Monday, June 17th, 2013

Accounting for mutational heterogeneity in identifying cancer genes… MutSigCV by @broadinstitute via @notSoJunkDNA: doi:10.1038/nature12213

PRISM metadata analysis: Paul Revere identified by his connections to other Colonial terrorists. – Slate Magazine

Sunday, June 16th, 2013

Great primer on network theory MT @russskinner PRISM… analysis: Paul Revere identified by his connections to others

You Are Here: A Whole-Sky Time-Lapse of the Galactic Center – Rebecca J. Rosen – The Atlantic

Saturday, June 15th, 2013

Amazing #photo of what the night sky should look like MT @TheAtlantic: whole-sky time-lapse of the galactic center

John Colapinto: A Surgeon Helps Singers Sing Again : The New Yorker

Saturday, June 15th, 2013

The elasticity of vocal cords, the difficulty of operating on them & the story of a surgeon doing this #medicine