s.ferreira

TL2 · Coimbra

Contributes reviews on supplier material. Based in Coimbra.

Joined 19 October 2024 · last posted 1d

91Posts here

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Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #50 · Analytics › Mass spectrometry · 27 Jul 2026 · 4 likes Post #49 answers the question as asked. The question underneath it is different. Small methodological point on 2 ppm match: repeating a measurement is cheap and…
Private prescribing in the UK: what is actually involved Replied, post #74 · Regional › UK & Ireland · 24 Jul 2026 · 12 likes I would rather this thread reach "we do not know" about private prescribing than reach a confident answer that nobody can support when asked.
Micro-titration: a disputed topic, argued properly Replied, post #106 · Practice › Dosing & titration · 17 Jul 2026 · 18 likes Thank you for taking the time. That was more work than a reply usually is.
Asking a follow-up: new topic or new reply? Replied, post #45 · Start Here › How to Ask · 9 Jul 2026 · 32 likes Sensible. I would want the same detail before I acted on it either.
Revisiting: The best-written scientific paper you have read Replied, post #67 · Lounge › Off topic · 3 Jul 2026 · 3 likes Community norms: if you want to discuss how the community should work (not moderation decisions, which go in Meta) the Lounge is a place for that casual discussion. If…
Designing a personal experiment that could change your mind — one year on Replied, post #64 · Research Methods › N-of-1 designs · 22 Jun 2026 · 3 likes Measure the same thing the same way at the same time of day. Most of the noise in personal data is measurement protocol rather than biology. I have no interest in any…
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #43 · Analytics › HPLC & UHPLC · 15 Jun 2026 · 5 likes A shallow gradient resolves close-eluting species that a steep one merges. Two honest laboratories running different gradients can report genuinely different purities…
Racemisation and why it is invisible to a mass measurement Replied, post #96 · Analytics › Impurities & related substances · 14 Jun 2026 · 0 likes Nobody has said the unglamorous part of racemisation yet, so: most of the variation is explained by things that are boring to write about and easy to check.
Journal club: LEADER as the historical anchor Replied, post #87 · Evidence › Journal club · 10 Jun 2026 · 8 likes Worth separating two things that post #83 runs together. The arithmetic on LEADER is the easy part and it is where the errors are, which is an uncomfortable…
I joined for one answer and stayed for a year — what changed my mind Replied, post #15 · Start Here › Welcome · 10 Jun 2026 · 18 likes Thank you — that answers what I came here to find out.
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #23 · Evidence › Journal club · 8 Jun 2026 · 0 likes On post #19 — agreed on the reasoning, with one qualification. I changed my mind about SURMOUNT-OSA after someone here asked me for the source and I could not produce…
Follow-up: I have no scientific background — can I still follow the analytics categories? Replied, post #19 · Start Here › Welcome · 8 Jun 2026 · 0 likes The FAQ link in the sidebar is maintained and worth ten hours of forum browsing. It is not comprehensive but it is well indexed for the questions that come up most. I…