Periodycal – The Compound Interest Newsletter

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Periodycal #4

compoundchem.substack.com

Periodycal #4

2022 chemistry news summary, atomic models, and milk

Andy Brunning
Jan 3
5
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Periodycal #4

compoundchem.substack.com

Happy New Year! And welcome to the first Periodycal newsletter of 2023. If you had a break over the Christmas period, I hope it was more restful than mine. A couple of weeks dealing with round 2 of COVID and kids with chickenpox and strep A put a bit of a dampener on the celebrations here!

This issue has a bit of a review of 2022 flavour, with a look back at some of the most significant chemistry news stories of the year and a summary of which graphics on the site proved most popular. There’s also the opportunity to weigh in on whether or not I should tweak the Ci logo as the website heads into its tenth year.


2022’s biggest chemistry stories

Infographic summarising twelve significant chemistry stories from 2022. More detail on each is provided in the text of the post below.
Click to view and download on the Ci site

It’s become a yearly custom for me to summarise the chemistry news stories over the previous year, so here’s this year’s overview. There’s more detail and links to relevant articles for each in the accompanying post on the website.

I particularly like that there are several call-backs to stories that made the summary last year, such as the stories on protein folding predictions and sustainable jet fuels, showing the additional progress that has been made. The theme of sustainability, and measures to tackle the climate crisis, also runs through a number of the stories featured.

As with every year I do this, the stories selected are skewed towards the more general interest, and may omit some more specialised chemistry news of no less significance. If you’re after more of the latter, you could do worse than checking out C&EN’s Year in Chemistry summary.

Got a key news story you think I missed? Let me know in the comments below!

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The most popular Ci graphics of 2022

An infographic history of the atom. Dalton identified that atoms of a particular element differ from those of other elements. Thomson discovered the electron and described the 'plum pudding' model of the atom: electrons scattered throughout a cloud of positive charge. Rutherford identified that the positive charge was concentrated in the nucleus of the atom. Bohr modified Rutherford's model by stating that elelctrons move in orbits of fixed sizes and energies. Schrödinger stated that electrons do not move in paths around the nucleus but in waves.
Click to view and download on the Ci site

For the fourth year in a row, this graphic on the history of theories of the atom was the most viewed on the website. It’s probably not surprising as the topic is a staple of intro-level chemistry curricula, and it continues to rack up more views than many of the other graphics combined.

Other graphics making up the top five in 2022 were:

  • A brief guide to the twenty common amino acids

  • Organic functional groups chart — expanded edition

  • A brief overview of classes of antibiotics

  • The chemical structure of DNA

Due to various commitments, I put together comparatively fewer new graphics last year, but I’m hoping to have some slightly more regular new graphics over the coming months. Subscribers to site updates might have already noticed a slight uptick in new graphics over December before our various family illnesses hit!

Thanks for reading Periodycal – The Compound Interest Newsletter! Subscribe for free to receive new posts and support my work.


National milk day: Dairy milk vs plant milk

Infographic on the chemistry of cow's milk. Milk is an emulsion of fat in water, and a colloidal suspension of proteins. Other compounds are dissolved in the solution. Droplets of fat, with an average diameter of 3-4 micrometres, consist of triglycerides and contain fat-soluble vitamins. Milk proteins form micelles which scatter light, making milk appear white. Lactose, a sugar found in milk, cannot be digested by those who are lactose intolerant.
Click to view and download graphic on the Ci site

January 11 is National Milk Day, so here are a couple of relevant graphics from the archives. The above graphic on cow’s milk looks at its composition, why it’s white, and what causes it to turn sour when it goes off. Then there’s the below graphic on plant milk which looks at how they compare to dairy milk in terms of environmental impact and nutrition.

Three-column Infographic on how plant milks compare to dairy milk. The first column highlights how plant milks are made: plant materials are either soaked and milled or dry milled, filtered to remove fibrous components, then formulated with water and other additions. They are then homogenised, heat treated, and packaged. The second column highlights the environmental impact of cow's milk, which has higher carbon emissions, land use and water use per litre produced compared to all plant-based milks. The final column highlights nutritional differences. Plant milks are fortified with calcium, and some are fortified with iodine, both found naturally in cow's milk. Protein content for plant milks is lower than for cow's milk.
Click to view and download graphic on the Ci site

Time for a logo change?

I like tinkering with things, as evidenced by the recent change to the infographics template, so with Compound Interest heading towards turning 10 years old later this year, I’ve been eyeing up the logo as the next possible change.

The current logo has barely changed since I started the site, with the only real change being the addition of the yellow colour to the green of the outer circle a year or so back. I’m not going for a huge change, but pondering switching the logo to the one above on the right, featuring the same molecule design that I previously used for Chemunicate.

I feel like the site could use a logo which says ‘chemistry’ more than the current one does, but I’m open to opinions. There’s a poll below where you can let me know which of the logos you prefer, or you can drop your thoughts in the comments below.

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Chemistry news & features

  • Illuminating toilet spray — This week in ‘news you didn’t really want to know’, scientists have used lasers to illuminate just how far the splash from a flushing toilet can reach. Thanks, science.

  • Blood test for Alzheimer’s disease developed — The new blood test method is a lot easier than the current testing methods of either brain scans or taking samples of cerebrospinal fluid, though it still needs to be validated in a broader range of patients.


That’s all for this fortnight!

2022 saw this newsletter reach almost 3000 subscribers. We’re not many short, and it’d be great to hit that milestone in the coming month, so please do share the newsletter with anyone else you feel may find it interesting and/or useful.

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Thanks for reading,

Andy

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Periodycal #4

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