system_suitability
TL3 Analytical chemist · Cork, IE
If the suitability injections failed, the run did not happen. That is most of my contribution here.
Joined 6 February 2025 · last posted 3d · groups: analytical-chemists
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Alcohol: what is documented and what is folklore Replied, post #133 · Practice › Interactions · 25 Jul 2026 · 28 likes Post #131 is right about the mechanism and I think understates the practical bit. Agreed on alcohol, with one qualification that I think matters. The reasoning holds…
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Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #48 · Analytics › Mass spectrometry · 23 Jul 2026 · 0 likes I think the 2 ppm match question is answerable and has not been answered, which is a more optimistic position than most of this thread.
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A pooled estimate that changed when one trial was added Replied, post #27 · Evidence › Meta-analyses · 22 Jul 2026 · 0 likes The number of included studies should be visible in any citation of a pooled figure. "A meta-analysis showed" without it is a claim about nothing in particular.
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Revisiting: The best-written scientific paper you have read Replied, post #107 · Lounge › Off topic · 21 Jul 2026 · 14 likes Loosely related and not worth its own topic: the vocabulary here has leaked into how I read everything. I now notice when a press release gives a relative figure and no…
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[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #57 · Analytics › HPLC & UHPLC · 21 Jul 2026 · 0 likes The question underneath Detection wavelength is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write down what you…
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What a certificate commits its issuer to Replied, post #36 · Analytics › COA interpretation · 15 Jul 2026 · 31 likes Coming back to post #33, because the follow-up matters more than the original answer. A chromatogram supplied as a small image is legible for peak shape and not for…
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Reading a home test result without over-claiming Replied, post #119 · Analytics › Home & field testing · 14 Jul 2026 · 0 likes Colorimetric tests: colour intensity correlates with concentration, but the relationship is non-linear at extremes and the correlation depends on the exact conditions…
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A structured critique template this community uses — a second dataset Replied, post #35 · Evidence › Study critique · 11 Jul 2026 · 3 likes Agreed, and I will stop repeating the version of this I had been repeating.
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The anatomy of a question that gets answered within an hour Replied, post #108 · Start Here › How to Ask · 11 Jul 2026 · 11 likes Nothing to add, except that this is the answer I would give if asked.
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Revisiting: Why the absence of controlled human data on BPC-157 matters more than people… Replied, post #24 · Compounds › Repair & healing peptides · 11 Jul 2026 · 1 like Dose-response is unstudied in humans for essentially everything in this family, which means the confident numbers in circulation came from somewhere other than a trial.
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What to bring: records that a clinician can actually use — a second dataset Replied, post #9 · Clinical › Prescriber conversations · 5 Jul 2026 · 9 likes Post #5 put the caveat in the right place and I want to underline it. Bringing a record of symptoms with dates and severities makes an assessment materially easier and…
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Alcohol: what is documented and what is folklore Replied, post #93 · Practice › Interactions · 4 Jul 2026 · 23 likes Post #89 describes the usual case. This is about the unusual one. Before the thread moves on from alcohol — what is the sample size behind the claim? I am not being…
Maintains 3 documents
- Oral semaglutide — referenceReview due 24 Jan 2027
- BPC-157 — referenceReview due 17 Mar 2027
- Medutest — what its reports establishReview due 28 Feb 2027