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Discord Now Fully Linked With 420chan IRC

Anyone here got college (physical chemistry) advice?

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- Wed, 23 Oct 2019 14:28:03 EST t8vvF5gX No.79648
File: 1571855283758.jpg -(63567B / 62.08KB, 640x621) Thumbnail displayed, click image for full size. Anyone here got college (physical chemistry) advice?
I’m in a biochem degree, and I’m in my senior year (so I’d be graduating spring 2020). So far I’ve loved all my biochem classes, all the genetics and microbiology electives, organic chem, and I even wound up liking my basic physics stuff cause even though I wasn’t great at it or interested in it, I had truly great professors that I remember well and up till now I haven’t regretted a thing.

Anyway I’ve entered a point where I think I’ve Peter Principled myself. I’m in the first round of p-chem and it may honestly stop me from finishing the degree, just a semester and a half out from me finishing it. I had similar freak outs with basic physics, but like I said my professors were great, and both times I pulled a B+ out of my ass/hard effort. The troubling thing is I really like my p-chem prof too, and have no complaints about his teaching style or expectations or willingness to help or anything - I just honestly think I’m not gonna be able to fucking pass it. I did well in calculus, but it’s been 5 goddamn years since those classes. And the more time I sink into trying to get my head above water in this physical chem stuff the less time I have for analytical chem which is also no cake walk.

It’s hard to think that I might not be cut out for this, because everything I’ve done under the purview of the rest of my degree, including analytical chem and instrumentation and shit, I’ve enjoyed it and excelled at it.

Most people I talk to who have done shit like this say get out ASAP if you don’t love it. But I’ve loved all of it /except/ this class, and this may be the one to stop from getting the degree. I’m sure I’m just being petulant when I say this but it sucks all the more to think it’s the least biochem-y thing out of the whole goddamn biochem major that might knock me out of contention.

Anyway, I know I’m not the first person to struggle with p-chem, but I’m at a loss. I’m doing everything I’ve done in the past and more and I’m still projecting an F. So any advice from someone who’s gone through this? I’m obviously gonna push through the semester and do my best, but if I have to take it again I’m gonna be out of time and money, so idk what to do. What would happen if I had to quit this late in the race?
1 posts omitted. Click View Thread to read.
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Sophie Hurrysadge - Tue, 12 Nov 2019 15:15:58 EST p8HXWzcj No.79678 Reply
>>79648
A lot of people struggle with pchem. I'd focus more on doing well in analytical and just hoping for a curve. You're most likely not the only one failing atm.

Suggestions for Combinatorics

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- Sat, 19 Oct 2019 19:14:55 EST 5G0eWq+5 No.79639
File: 1571526895463.png -(261126B / 255.01KB, 968x970) Thumbnail displayed, click image for full size. Suggestions for Combinatorics
I'm a rising graduate student in Mathematica who thinks one of my interests may lie in combinatorial theory. I haven't been formally introduced to it in a lecture, so I'm looking for suggestions in resources to look into.

Firstly, does anyone have recommendations for an intro to combinatorics book that is good? Something readable but also worth the effort?

Second, if anyone could give me a rundown of what topics I need to be well versed in before getting into combinatorics, I'd love to check all those boxes first.

Thanks for any help.
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j jihad - Mon, 09 Dec 2019 14:21:10 EST bnxv8VkG No.79708 Reply
Sure, I can recommend the book they use at a top 15 US uni to teach it. I'll pull this information from the course description.

ISBN 978-981-3148-84-0
A Walk Through Combinatorics 4th edition
Author: Miklos Bona

I took the class for a few weeks but had to drop the term for some personal reasons. I think we used a different book back then, but this is what the current professor is using.

Class title is "Combinatorics and Discrete Mathematics" - not sure how strictly on-topic the book will be as a result.
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trypto - Wed, 11 Dec 2019 19:22:59 EST o3YVeS9z No.79709 Reply
>>79639
IDK, But that's fuckin awesome that you're gonna be studying combinawhatsits.

Do you know about difference equations? Just another word for recursion relations, I think. Fractals and whatnot. I think it's combinatoric-adjacent.

Discrete mathematics is the fucking shit.

Coca: A Full Alk Extraction

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- Wed, 30 Oct 2019 03:36:42 EST xA5UZy5x No.79661
File: 1572421002001.jpg -(178853B / 174.66KB, 750x550) Thumbnail displayed, click image for full size. Coca: A Full Alk Extraction
Sup /chem/ of /stem/

How hard would it be for a person to perform an extraction on coca leaves but instead of refining to cocaine hcl you just pulled the plant's entire alkaloid profile together? Basically if someone wanted the less jagged rush you get from chewing coca (as opposed to just coke) but in a compact easier to dose form.

The notes I found on cocaine extraction don't seem too bad but I don't know enough about chemistry to know what steps are necessary and which are too far. Would an acid base extraction work? I did a couple cactus extractions that way a long time ago. Like would just giving the leaf powder a limonene bath then mixing with vinegar do the trick? Could you just soak in alcohol and make a tincture of it? What would be the better ways to go about this?

And just as a side question, how hard would it be to create an extract that retained not only the alkaloids, but the flavor in concentrated form as well? If someone wanted to make beverages or something.
7 posts omitted. Click View Thread to read.
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Simon Gapperwell - Sun, 10 Nov 2019 18:28:12 EST F918uikB No.79674 Reply
>>79673
No, I always knew erowid had some random stuff here and there about synth but not an entire section. I'll look at it, most of my resources back in the day came from nexus.
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trypto - Sun, 10 Nov 2019 22:01:46 EST ih85T/wB No.79675 Reply
>>79674
It's not really a erowid synthesis section. It's an archive of an old website/forum called rhodium (I mentioned it earlier). It has a lot of good info, though in general it's outdated. It's all like 20 years old. Of course, coca extraction hasn't changed much, so it's cool.

blah

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- Sun, 27 Oct 2019 05:23:43 EST iMHTaTjh No.79652
File: 1572168223249.jpg -(20203B / 19.73KB, 470x251) Thumbnail displayed, click image for full size. blah
Is it possible to extract Hydroxy alpha sanshool from szechuan pepper and if so how?
Doesn't have to be particularly pure, I'd just like to be able to have a better concentration of it for cooking than you typically get from the peppers themselves.
8 posts and 1 images omitted. Click View Thread to read.
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trypto - Sat, 09 Nov 2019 01:56:06 EST ih85T/wB No.79669 Reply
>>79668
Also, you could definitely try an extraction with plain vodka. Try to get a high proof (surely your country has 50% vodka?!)
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Edwin Tootman - Fri, 29 Nov 2019 04:51:56 EST iMHTaTjh No.79699 Reply
>>79670
I'll probably try this as the other options are mad rare or expensive. Thanks all.

A. muscaria - complete decarboxylation of ibotenic acid to muscimol

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- Thu, 17 Mar 2016 12:28:40 EST ge3zUrSE No.77751
File: 1458232120013.jpg -(80063B / 78.19KB, 511x487) Thumbnail displayed, click image for full size. A. muscaria - complete decarboxylation of ibotenic acid to muscimol
I have a chemistry related question for you.

I've read in two separate sources that it is possible to decompose all the ibotenic acid in the muscarias to muscimol by boiling it in a very low pH solution (2.7). One source seems to have used HCl to achieve this. I was wondering if this would be possible to achieve using household vinegar or citric acid.

5% household vinegar seems to have a pH of 2.4, but acetic acid has a low vapour pressure, so boiling vinegar would vapourize acetic acid with water. apart from making your house smell, vapourising acetic acid would drive the pH of the solution higher, so you might need to add more vinegar to the pot regularly.

However, attempting the same with citric acid seems to be more straightforward since citric acid doesn't vapourise as readily. You can just add water to the boiling solution to cover for evaporation losses and be fine. Lemon juice is said to have a pH around 2, and you can calculate the pH of a solution from the amount of citric acid you add so it should work.

After 2.30 - 3 hours of boiling, you can just add some sodium carbonate to neutralize the pH in order to make it more palatable, and filter to remove leftover carbonate/mushroom pieces, and drink. I'm pretty certain this step wouldn't alter the structure of muscimol.

The conversion from ibotenic acid to muscimol seems to be dependent on pH, so I think it should be possible, but I don't have enough chemistry knowledge to say or certain. What do you think?

If this works, this could be used as a very easy homemade tek for preparing Amanitas.

Pic related, ibotenic acid converts to muscimol after boiling at low pH.

This is the paper;

http://onlinelibrary.wiley.com/doi/10.1111/j.1471-4159.1985.tb04052.x/abstract

just copy and paste that link to sci-hub.io to get the full text.

and this is a patent on the same topic

https://www.google.com/patents/US20140004084
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trypto - Thu, 31 Oct 2019 22:18:24 EST pZgexHYG No.79664 Reply
>>77751
>but acetic acid has a low vapour pressure, so boiling vinegar would vapourize acetic acid with water.
Not as low as water's vapor pressure. Just throw a lid on, and it should be fine. Although your house still might smell.

>The conversion from ibotenic acid to muscimol seems to be dependent on pH, so I think it should be possible, but I don't have enough chemistry knowledge to say or certain. What do you think?
I think you're correct. It just needs some protons and heat to decarbozylate. But surely other people have done this recreationaly? Aren't there teks for using Amanita? I think you're right, but I'd still search for more info. IDK anything Amanita


>>79663
While it's probably fine, I think it's a good rule of thumb to use food-grade shit when it's available.

disintegration

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- Thu, 24 Oct 2019 19:05:56 EST 0yyEhULd No.79649
File: 1571958356672.jpg -(104117B / 101.68KB, 820x820) Thumbnail displayed, click image for full size. disintegration
if you were pulled apart one atom at a time, would you feel any pain?
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Edwin Bockletodge - Mon, 28 Oct 2019 02:57:59 EST LsZEr5KY No.79655 Reply
>>79649
depends on where you started, if it was from the outside in I think it would be extremely painful as your nerve receptors receive signals that things are starting to go missing and want you to fix it. if it was from the inside out you would definitly be dead before it start to hurt too badly as we don't have next to any pain receptors internally
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Sophie Nicklespear - Mon, 11 Nov 2019 03:57:17 EST HoJCWjh0 No.79676 Reply
>>79649
No. You would notice. We have atoms gone all the time. We're huge atom shredders. Colossal ones, honestly. lol At that level things are not really sensible. It's a delicate field and additions are just not a small thing by any means. The field of micro biology I guess this would fall into, I'm telling you you're not gonna feel a thing in this context. If you have atoms interacting, changes will certainly go on and they'll unsettle situations. If you're inserting something to remove atoms that's gonna change things. Adding and taking away atoms makes a difference. In practical terms, you won't think anything is going on. You will be the poster boy of unphasedness. lol Based.
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trypto - Tue, 12 Nov 2019 15:15:02 EST dxPy+pHf No.79677 Reply
>>79655
Yup. Inside-out? Some blood vessel would burst, you'd bleed internally without pain until you lose consciousness and die. Then you'd slowly disappear, while everybody around you is wondering WTF is happening.

If it's outsiide-in? Then you'd get extremely hot as a burning sensation pours over your entire body. You'd probably also lose blood very quickly at this point, but not before excrutiating pain. Best case scenario, for some reason you don't lose blood, and you have a few seconds/minutes as a screaming skeletal muscle anatomy lesson.

Cybersecurity Youtube

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- Mon, 26 Aug 2019 23:18:05 EST TiALbS4B No.79566
File: 1566875885337.gif -(4538245B / 4.33MB, 350x420) Thumbnail displayed, click image for full size. Cybersecurity Youtube
sup /stem/

looking for good youtube channels for background listening- but not like tutorials. like news roundup, or modern topic discussion. just wanna be up to date while i study the basics.

thanks yall
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Edwin Pishfield - Wed, 23 Oct 2019 09:14:29 EST XEIQ/mPL No.79645 Reply
https://www.nature.com/nature/articles?type=nature-podcast
https://www.sciencefriday.com/podcast/
https://www.alieward.com/ologies/
https://www.bbc.co.uk/programmes/p04d42rc
https://www.wnycstudios.org/podcasts/radiolab

Those are some science podcasts. The first two cover the most recent science. Ologies in interviews with experts in a ton of different disciplines. Then the last two look at interesting science-related questions.
>>
Edwin Pishfield - Wed, 23 Oct 2019 13:00:43 EST XEIQ/mPL No.79646 Reply
>>79645
Oh wait. I just noticed the topic is cybersecurity, not science. Ummm. I got nothing for cybersecurity.

Frankenstein needs a motor

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- Wed, 21 Aug 2019 16:40:16 EST JQda6AyJ No.79547
File: 1566420016760.jpg -(86174B / 84.15KB, 750x563) Thumbnail displayed, click image for full size. Frankenstein needs a motor
That produces as much or more torque and has at least as much dynamic control as an 120 AV personal massager for female masturbation. The idea isn't actually to target the clitoris specifically as other grinders have discovered as the entire penis and forward pelvis can serve as a vibrator if done properly.

The problem is the intensity, I want to achieve the same amount of penetrating vibratory force as the machine, but since the volume of the surface that is vibrating is different, depending on the motor position a precise copy of the other motor may not be the right choice.

Essentially, you just have to make sure you can still get erect. According to another grinder who did this, it's actually quite pleasurable for the dude to turn it on as well as the woman.

The issue is putting any kind of 120v circuit in an implant is pretty much absurd but I want to test the limits of what can be. The motor is a "The motor SN3658–220-GHSF is a 6600 RPM, high voltage brush motor made by Igarashi Motors USA." I think the motor voltage is actually a bit higher like 170v.

So.. we have a willing guinea pig, and I know of a piercer who will put inside me, and I know I'll need medical grade bioinert titanium as well as sterile silicone. The other big problem is where to put the battery, but it can actually be located elsewhere as long as a wire can be run to it, but that also seems annoying.

I'm going to try to run up some basic ratios on motor torque vs battery life vs the kind of inductive charging PCB stuff you can get off shelf. The easiest part is the remote, which can probably just be made using an android integration kit for DIY electronics from amazon.
9 posts and 2 images omitted. Click View Thread to read.
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TRYPTO - Mon, 30 Sep 2019 22:50:08 EST 3N1MYSJB No.79597 Reply
1569898208901.jpg -(81546B / 79.63KB, 1125x569) Thumbnail displayed, click image for full size.
Thist is the second dick fatality on 420chan this year. Remember there was the dude with the dickbox on /b/? His dick got stomped on, then infected and now he's dead. Then there's this vibro dick dude. he's clearly dead.

That's wild. Two dick deaths in like 3 months.
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Clara Clayshit - Sun, 20 Oct 2019 07:34:14 EST W+fNKKVr No.79642 Reply
>>79597
i bet the jews did this Because they are obviously jelly about foreskin

guys guys

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- Sun, 25 Aug 2019 06:19:39 EST V+dVnopD No.79564
File: 1566728379724.jpg -(17123B / 16.72KB, 450x291) Thumbnail displayed, click image for full size. guys guys
so let's make a conscious computer
let's do it by modeling the lexical decision making part on the forebrain and the lowe rparts on input (like raw text input or other input) from the internet
but here's the thing, we have to make sure, however we make my artificial human dude, we have a way to artificially get him stoned, otherwise it's not ethical

Living past 122.

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- Tue, 09 Jul 2019 16:35:39 EST MjqcGRw1 No.79486
File: 1562704539144.jpg -(127598B / 124.61KB, 1280x720) Thumbnail displayed, click image for full size. Living past 122.
So far, humanity's all time high score for living is 122 years and 164 days.
That's using the old fashion technique of health, wealth and happiness.

What I want to know is, if we cheated nature a bit with current or future technology, how long could we live?
16 posts omitted. Click View Thread to read.
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James Chirringfoot - Thu, 26 Sep 2019 10:34:54 EST W+fNKKVr No.79592 Reply
>>79580
Holy shit, i didn't now that? Sure that obesity isn't a cause? It seems so likely when i see all them whales wobling around
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Beatrice Denkinshaw - Thu, 26 Sep 2019 12:04:23 EST cbqxINXZ No.79593 Reply
>>79592
Well, sometimes fat people hate themselves for being fat, which can lead to drugs (OD) and depression (suicide).
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Therm0ptic !cyBOrG7t12 - Fri, 04 Oct 2019 03:19:46 EST uEs3Hpo/ No.79615 Reply
>>79579
>>79587
Wtf my diet consists of home cooked meals made with organic and grass fed ingredients and all that shit, either grown in the garden or bought from local co-ops. I also walk daily. Plus i'm not an alcoholic, I don't even drink much really.

Unfortunately i'll actually probably die super ugly due to mouth cancer from non-stop cigar and pipe smoking. Shame it can't be prevented.

Home-made Dynamite / Making A Bomb

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- Wed, 11 Apr 2018 03:23:05 EST ynVJ73wC No.79055
File: 1523431385404.gif -(1601367B / 1.53MB, 256x192) Thumbnail displayed, click image for full size. Home-made Dynamite / Making A Bomb
Hypothetically speaking, I am curious
Having rewatched Fight Club recently what with the home-made dynamite there
How would /chem/ recommend making a bomb, hypothetically speaking?
Asking for a friend. Like, not a huge bomb, but, you know.
27 posts and 9 images omitted. Click View Thread to read.
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Bombastus !uYErosQbLM!!Mybq1UbK - Tue, 04 Jun 2019 14:26:43 EST taPIkFWF No.79443 Reply
>>79440
honestly if you need me to tell you that nitric acid is required for safe pyrotechnics, then you probably didn't plan to survive in the first place.............

I don't understand the problem in making sustainable fusion happen

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- Tue, 23 Apr 2019 11:30:45 EST LIARuhXT No.79377
File: 1556033445586.gif -(2481121B / 2.37MB, 480x303) Thumbnail displayed, click image for full size. I don't understand the problem in making sustainable fusion happen
Explain it to me a lay person.
The issue is they don't have enough energy to:
A) Create and sustain a reaction long enough
B) Also power the containment of the whole reaction at the same time
C) Generate this whole reaction not at some massive net loss of energy.

Maybe I'm stupid or over simplifying this. Why not hook one of these big fancy Chinese reactors directly to say a gigantic hydroelectric dam (or other renewable resources) that more or less generates infinite huge amounts of energy and use those to power reactors?

Pretty stoned.
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Hugh Tillingstone - Sat, 24 Aug 2019 16:34:50 EST zCQgmjjm No.79563 Reply
>>79559
Regarding a "hydro" power "battery"
It's feasible to think about a torridal container in which a superfluid slushes around friction-less. If the walls of the container are strong enough the momentum, or speed of the superfluid could be increased by arbitrary amounts.

Where it breaks down is of course we know of no superfluid that remains stable without constant cooling and no materials to build the container out of.
Furthermore every conceivable method of extracting or putting in energy from/into the fluid will have losses.
But I suppose if we can use superconductors all over the process those losses would just amount to imperfections and quantum fluctuations.

The question in OP while interesting doesn't make sense to me without some creative interpretations.
Also congrats OP of being able to continue your stoned train of thought at a later date, I'm jealous.
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James Randi - Tue, 27 Aug 2019 07:06:59 EST REIva1py No.79567 Reply
>>79563
Thanks, I feel like I learned something.

Thats why I love this site, I can have a stoned thought and follow it here for a fucking year.


Taking P.Chem

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- Wed, 21 Aug 2019 19:28:24 EST 7Sqs7hoy No.79553
File: 1566430104693.jpg -(44904B / 43.85KB, 746x564) Thumbnail displayed, click image for full size. Taking P.Chem
Any advice on how to study it?
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Martha Fadgewill - Wed, 21 Aug 2019 22:29:36 EST 5Zffhqtf No.79555 Reply
>>79553

Atkins->wikipedia->smoke->wikipedia+you draw diagrams high
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Martha Fadgewill - Wed, 21 Aug 2019 22:37:08 EST 5Zffhqtf No.79557 Reply
And after all that, read atkins again
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Thomas Mublingnug - Fri, 23 Aug 2019 05:58:50 EST 5Fcvu2ce No.79560 Reply
>>79554
Eyyy! We're like twins!

OP, there's only like two equations you need to know for p.chem, just memorize them. After that, you just need to be good at calculus.

Study calculus.

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