🎓 Doc Freemo 🇳🇱 @freemo@qoto.org

lol, truth.

#science #biology #funny #humour #humor #meme

Why is it so hard to get a good Role-model for climate change activism.

I used to be fairky active about climate change but now that Greta came along I had to distance myself from most organizations as many seem to praise or support her. It is such a shame we cant have role models in climate change we can look up to.

#climatechange #climate #science #enviroment #greta #gretathurnberg

Me as Santa Clause

#science #SantaClause #Christmas

If you like pretty colors, lots of graphs, and astronomy, check this out: https://www.solarham.net/

#science #astronomy #space #ham #hamradio

For all those writing their #Science term papers right now...

Here is a free book (Draft) I am writing (slowly) explaining how to analyze AC electrical circuits in the frequency domain.

Anyone who wants to learn the math behind electronics and specifically AC or RF circuits should download it and check it out,

https://discourse.qoto.org/t/frequency-domain-circuit-analysis-tutorial/41

#electronics #EE #science #rf #circuits #ElectricalEngineering #HAM #science #AC

If I did a write up explaining the difference between complex number representation of vectors vs Matrix/Linear algebra representations would anyone be interested in reading that?

I feel it would be useful to explain why and how multiplication is different between the two and why division on matrix vectors is forbidden but allowed in complex form and the repercussions of that.

Might also be useful to go into some explanation as to how to intuitively know when to use one or the other (something even i struggle with from time to time).

#science #math #maths #mathematics

Never forget your coordinate fields and unit circle. Probably one of the most important things to know as an engineer.

#science #math #maths #mathematics #euler #vectors #LinearAlgebra

Lololol.....

#Science #physics #joke #jokes #funny #humor #humour #meme

Soooo cool!

#space #iss #science #APOD

Selfie time!

#science #humor #joke #humour #jokes #meme

Interesting fact of the day: The color of a turkeys head changes drastically from a ocean blue to a bright red depending on the turkeys mood.

#science #biology #conservation #turkey #thanksgiving

Woooaaa sleeping octopus is dreaming:

https://www.indy100.com/article/octopus-dreaming-colour-change-film-amazing-9124281

#science #nature #ocean #octopus #dreaming

For todays #FollowFriday I'm going to do something a bit different. We have a lot of new users, one of the biggest surges we have seen in a while. As such a lot of new users are looking for high quality, long-standing, accounts to follow. Similarly many of the new users need some help getting attention and making new friends.

As such I am going to do this #FF in a few parts. One for old users I have mentioned in previous posts, as well as some of the new users who have been making quality posts and been active for at least a week now. Hopefully this will be more helpful.

Also a section for some bots might be useful.

I will use a persons profile description here as I dont want to misrepresent anyone.

New Mentions

@design_RG - Books, Bicycles & Cats, Life is Good. Books, #hardcover. Bikes, #Classic sport ones. Cats, any colour or size. #Aquarius with Virgo rising. House of Ravenclaw.

@Karthikdeva - Always a Student, Nano-Technologist, Bookworm?, and basically I don't know anything, so I might be asking some agonizing questions.

@_lunawinters - Just a human , living on a rock called Earth, floating in a giant space.

@VidyaKrishnan - Independent journalist, S. Asia

@Shamar

@yantrajaal - Engineer by education, teacher by profession, programmer by passion and imagineer by intention

@susi123 - வாசிப்பையும்
நேசிப்பையும்
மறந்தவள்,,,..

@Full_marx - I am a मस्त डॉन on Mastadon. I wish to build something that can be of good use to as many people as possible. Social Sciences: Propaganda Science, Social Engineering, Behavioural Science, Advertising STEM: Human-Computer Interaction Design, Web Dev, Cyber Security Noob. Multimedia: Motion Graphics, Video Production, Electronic Music Production, Abstract Film, Writing Politics: Left, Right and Center. Whichever ideology leaves the people with the most amount of Dignity, sign me up for that one.

@raining_night - I love women, food, thriller/sci-fi/slasher movies and series, astro physics, superbikes, nature and animals ❤️ not in any specific order Trying out Veganism.

@shibaprasad - Master's student. Football Fan.

@ppmanik - Believe in free speech and data privacy. Interested in physics and science in general and future of Semiconductors and related devices in particular.

Old mentions

@jump_spider - #ActuallyPsychotic <> programming autodidact and polyglot <> meditation enthusiast

@chris - Developer focusing on #WordPress, #Privacy and the #OpenWeb. Also a speaker, teacher, blogger, and pilot doing my best to make the world a better place.

@SecondJon - I'm interested in being just not civil, but excellent in interacting with others of different viewpoints in an online world where we can so viciously defend our echo chambers and be so dismissive of other perspectives. I rarely log onto the bird site of FB anymore because the interactions are unproductive about anything meaningful. I'm a #Dad, #Husband, #Christian, #Anglican, Unaffiliated #conservatarian, Software #Developer, #Coloradan, Reader of paper #books, Card and BoardGamer, #tea drinker, solving problems for co-workers and partners primarily with and integrating with the #Salesforce/SFDC platform.

@sandfox - #PHP and #Ruby developer

@cwebber@octodon.social - User freedom activist, ActivityPub co-editor, parenthesis enthusiast, occasional artist.

@whirli - #teacher #rugby #skeptic #freesoftware #privacy #camping #hammocks #Finland #Suomi

@pschwede - #Coding #Paradigms #GraphRewriting #YPEGIDA #choas #KzU #developer #programming #philosophy #scifi #linux #sociology #luhmann #HvF #python #java #sed #awk #cis #white #freespeech #atheism #freereligion #art #drawing #pixelart #diagrammatics #symbolism #dresden #unisex

@Rovine - Born in Hong Kong, lived in Australia, working holiday in UK. #developer #programming #music #learning #frontend #gamedev

@Absinthe - The green faerie

@mngrif

@ae - #CogSec #Researcher

@metapsyche - I am a cloud of vapor. Fragmenting into ever smaller pieces to explore ever widening spaces. Web Developer by day, Pattern Hunter at night. Thinker and Tinkerer on weekends. :)

@imvectech - RESEARCH ° COOPERATE ° MONITOR ° ADAPT. Developing and teaching to implement DITO techniques for human survival between knowledge and fate.

@canonicalbrud - #Orthodox #Christian; husband and father; #biomedical #development #engineer; #crypto tinkerer; Stephen #Talbott fan, i.e. proponent of (re-)introducing #λόγος and #τέλος into #biology and thus heal the modern rifts between #philosophy, #theology, and the natural #science/s.

@david - Value people over code. I manage tech.lgbt. WordPress Maintenance fixupfox.com. On the Internet, everyone knows I'm a dog. Follows are open both ways for me if you're nice and cool!

@Algot - Words are my friends. #ArtWithOpenSource #3D #Clipart #poetry

@Curator - Curator of art from the instance

@Erik - Privacy, plants & politics Student CybSec @

Bots

@arxiv_math

@arxiv_eess - Electrical Engineering

@arxiv_physics

@arxiv_cs

@arxiv_stats

@arxiv_bio

Some sort of segmented worm, i think, we just found in some pond water. Any ideas from anyone what species i might be looking at?

#science #biology #microbiology #worm #microscope #microscopic

Some Acetobacteria under the microscope. The sample was taken from some homemade kambucha we have brewing in the house.

Took the picture with my phone through the eye-lens so rather shitty, sorry.

#science #biology #microbiology #macro #bacteria #microscope #acetobacteria

I love Guix's idea of transaction management and rollback. I look forward to see how this particular Linux Distribution is going to evolve. They are off to a good start!

http://guix.gnu.org/blog/2018/multi-dimensional-transactions-and-rollbacks-oh-my/

#Linux #Science #Technology #CS

Interesting fact of the day: despite the moon only being 1/4th the diameter of the earth it is a whole 1/80th the mass! But in terms of volume it is 1/50th the volume.

People don't realize how the relationship between diameter and volume is non linear. So it creates these very unexpected differences, especially at large scales.

#Space #science #moon #IFOD

Some cool science learned from Zebras.

https://www.realclearscience.com/quick_and_clear_science/2019/10/07/painting_zebra_stripes_on_cows_wards_off_biting_flies.html

#Science #biology

Someone asked me why DNA and RNA are acids. I am **not** an expert in chemistry but I did study the basics of organic chem and do dabble a bit so I wanted to share the answer here.

Simple answer: Anything that lowers pH is an acid, RNA and DNA lower pH, therefore it is an acid.

Complex answer:

Nucleic Acids are called acids because, well, they lower pH, as anything that is an acid would. pH is, in simplistic terms, the concentration (logarithmicly) of H+ ions in a solution.

A unrelated side note with acids that dont directly donate a H+, your Lewis Acids, they still increase H+ in an aqueous solution because it effects the balance of H+ and OH- dissociation of the water itself. As such the H+ measure is still accurate. However Nucleic acids are not a Lewis Acid, they are a Bronstead-Lowry acid, which means they directly can dissociate and provide the H+ ion directly in an aqueous solution. But I'll get to that.

The individual parts of any molecule can be either acidic and basic, but a molecule overall will usually be one or the other depending on which dominates, RNA is no different, there are three major components to RNA, I attached a picture to show them. The components are a phosphate group, a sugar, and a nitrogenous base (the part that encodes data, your citosine and guanine and shit). Here is the cool part, the word base when talking about the "bases" of a strand is specifically chosen as the the word because they are themselves bases (on their own they would raise pH). Similarly the phosphor group, is also acidic, this should be obvious by its similarity to phosphoric acid. It is a proton donor for the same reason phosphoric acid is a proton donor.

So the only question remaining is why does the acidic phosphor group dominate over the Nitrogenous Base? Well for starters the the phosphate group has a pkA of near 0 , the Nitrogenous Base has a pkB of around 9.8 (depends on the base), so already the phosphate group is going to dissociate more readily than the Nitrogenous Group. However RNA strands are actually far more acidic than the individual Nucleotides that compose them happen to be. The reason for this is that RNA folds back in on itself with the bases associating with each other much like two halves of a DNA strand would. This causes the bases to be on the interior of the molecule while leaving the phosphate groups all around the outside. Since the bases are not exposed to the aqueous solution they do not dissociate as readily as they otherwise would while the phosphate groups are free to dissociate. Thus the RNA exhibits significant acidic properties.

By the way the acidic nature of RNA and DNA is intentional and functionally important. It means that the pH of the solution can be adjusted to effect the charge on the nucleotides and thus move it around. In a neutral pH solution the phosphate groups will have a negative charge. This results in the phosphates pushing each other away. This in turn can cause them to line up on opposite sides with their bases facing each other as well as help to straighten out a strand's backbone.

#biology #science #chemistry #organicchemistry