Anonymous at Mon, 1 Apr 2024 02:26:09 UTC No. 16107199

we are so alone, it's never been more over

Anonymous at Mon, 1 Apr 2024 04:00:20 UTC No. 16107307

>>16105953
I'm working on d13C of CO and d18O od CO. I used to work with an old Thermo Delta V, lsodat was kinda jank but somehow workable. Now I'm using a Delta Q and Qtegra is absolute shambles, Thermo is absolute shambles

Anonymous at Mon, 1 Apr 2024 15:36:09 UTC No. 16107854

cool shit OP
I looked up delta 13 C and delta 15 N; I learned something new (I've only done a couple Gen. Chemistry classes; which covered some organic and maybe mentioned a thing or two about Carbon isotopes)

What insights do you get by visualizing the "% d25N" as a function of d13C?
Oh holdup that's not the usual percent sign ‰, kek I don't even know how to interpret this

Lake trout seems like a stoic well balanced guy
Speckled dace is intent on pushing into new frontiers
>*huffs fumes*

Anonymous at Mon, 1 Apr 2024 23:16:10 UTC No. 16108483

>>16107854
hey fren! I can give you the basic rundown of some insights you can glean from the isotope data (keep in mind I'm certainly not an expert) Basically, we measure predictable variation in natural isotope abundances as markers to answer various questions. There's a pretty significant amount of information you can get from specifically δ15N and δ13C, for instance the nitrogen component sees a stepwise enrichment as you ascend the trophic levels in a food web, so you can determine trophic subsistence, while with δ13C you can determine something like the photosynthetic pathway of plants, i.e whether or not they're operating on a C3 or C4 system or even if they're CAM plants. My interest are primarily in the Arctic, so for me C4 plants aren't a concern so δ13C can instead be used to sometimes differentiate between primary producers like phytoplankton and sea ice algae, but mostly to differentiate between general marine vs terrestrial organisms based on how terrestrial plants typically intake CO2 atmospherically through their stomata, while something like sea ice algae intakes carbon through CO2 diffusion. Generally, this is all facilitated by isotopic fractionation, which is the division of isotope abundances between two substances that have undergone a reaction, or when a reactant product has undergone a phase transition. Thats mass dependant fractionation, and it's predictable since at this level the lighter isotope is more reactive. Technically there's also mass independent fractionation but idk how it works and I don't care to find out right now lmao, I present this all as cut and dry but there are absolutely some complications strewn about

Anonymous at Tue, 2 Apr 2024 00:32:52 UTC No. 16108592

Hydrogen-1 is the only stable isotope according to the standard model of particle physics because of anomalous violation of baryon number conservation by multiples of 3.