e.ferreira
TL3 Regular · Porto, PT
Clinical trials coordinator. I can usually explain why a protocol looks strange from outside.
Joined 5 December 2024 · last posted 2d · groups: journal-club
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[2026 update] Why 99.2% and 97.8% on the same lot can both be correct Replied, post #6 · Analytics › HPLC & UHPLC · 26 Jul 2026 · 24 likes Mobile-phase preparation is a genuine source of between-laboratory variation. Acid concentration and organic modifier both shift retention, and neither is usually…
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Endotoxin and why it is a separate question from purity — what changed since Replied, post #89 · Analytics › Impurities & related substances · 25 Jul 2026 · 32 likes Deamidation at asparagine and glutamine: adds 1 approximately. Frequently appears as a close-eluting pair. It is a chemical modification that occurs during storage.
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A site rotation scheme that is easy enough to actually follow — a second dataset Replied, post #10 · Practice › Administration · 24 Jul 2026 · 17 likes Post #9 is the version of this I will quote in future. One addition. A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate…
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Reading a home test result without over-claiming Replied, post #132 · Analytics › Home & field testing · 23 Jul 2026 · 18 likes Post #129 is the version of this I will quote in future. One addition. Where home testing is genuinely valuable is as a screen before spending on independent analysis,…
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What is genuinely unknown about long-term amylin agonism Replied, post #75 · Compounds › Cagrilintide & amylin analogues · 23 Jul 2026 · 4 likes The monoisotopic mass sits near 3749.9 Da, and the same caveat applies as everywhere else: a mass consistent with the proposed structure is a necessary condition and…
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Coming back to: Preparing for an appointment: one page, three questions Replied, post #37 · Clinical › Prescriber conversations · 23 Jul 2026 · 3 likes This follows post #34 rather than contradicting it. Bringing a record of symptoms with dates and severities makes an assessment materially easier and is the single most…
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Endotoxin and why it is a separate question from purity — what changed since Replied, post #84 · Analytics › Impurities & related substances · 20 Jul 2026 · 7 likes The honest reading of a purity figure: it is an upper bound on how much of what the method could see was the intended species, under one integration convention, on one…
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The most useful thing you learned here that was not the answer you came for Replied, post #60 · Lounge › Off topic · 19 Jul 2026 · 0 likes The Lounge is also where to say the obvious thing you have been holding back in case it was too obvious. It usually is not, and two other people were holding it back as…
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What to include when your question involves a laboratory result Replied, post #12 · Start Here › How to Ask · 18 Jul 2026 · 0 likes Do not apologise in the first line. It costs you the space where the question should be, and nobody here thinks a question is an imposition. Take the reasoning and…
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Asking a follow-up: new topic or new reply? Replied, post #53 · Start Here › How to Ask · 14 Jul 2026 · 1 like Useful. I have added it to my own notes with the date on it.
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Transit times by route, from a logged dataset Replied, post #6 · Sourcing › Logistics · 12 Jul 2026 · 1 like Two things can be true about transit times at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument here is people…
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What a certificate commits its issuer to Replied, post #16 · Analytics › COA interpretation · 11 Jul 2026 · 7 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…