s.ferreira

TL2 · Coimbra

Contributes reviews on supplier material. Based in Coimbra.

Joined 19 October 2024 · last posted 1d

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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 is the version of this I will quote in future. One addition. Small methodological point on 2 ppm match: repeating a measurement is cheap and resolves most of…
Private prescribing in the UK: what is actually involved Replied, post #74 · Regional › UK & Ireland · 24 Jul 2026 · 12 likes Nothing in this subcategory is medical or legal advice, and prescribers reading here consistently say so themselves. I am describing what is, rather than arguing for…
Micro-titration: a disputed topic, argued properly Replied, post #106 · Practice › Dosing & titration · 17 Jul 2026 · 18 likes Answering the micro-titration question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how the first…
Asking a follow-up: new topic or new reply? Replied, post #45 · Start Here › How to Ask · 9 Jul 2026 · 32 likes If you are asking about a document, quote the exact wording of the line you are asking about. Paraphrasing a specification is how a discussion ends up about a document…
Revisiting: The best-written scientific paper you have read Replied, post #67 · Lounge › Off topic · 3 Jul 2026 · 3 likes Industry and supply chain: post about manufacturing, pharmaceutical economics, or market dynamics if you have something substantive to contribute. If the premise is…
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 That is a cleaner way of putting what I was circling around.
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #43 · Analytics › HPLC & UHPLC · 15 Jun 2026 · 5 likes Area percent is a proportion of absorbance, not a proportion of mass. Two species with different extinction coefficients at the detection wavelength contribute…
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 Post #83 put the caveat in the right place and I want to underline it. The arithmetic on LEADER is the easy part and it is where the errors are, which is an…
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 One thing that took me a while to notice: the search box indexes maintained documents as well as topics, and documents carry a review date. If a document and a…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #23 · Evidence › Journal club · 8 Jun 2026 · 0 likes I read post #19 twice before replying, because I had assumed the opposite. I changed my mind about SURMOUNT-OSA after someone here asked me for the source and I could…
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 Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…