k.pereira

TL2 · Kraków

Contributes reviews on supplier material. Based in Kraków.

Joined 13 March 2025 · last posted 2d

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Semaglutide and alcohol: what is actually documented Replied, post #19 · Compounds › Semaglutide · 25 Jul 2026 · 0 likes Solutions of semaglutide can look faintly opalescent without anything being wrong. Visible particulate, fibres or frank cloudiness are a different observation entirely…
Immortal time bias in a claims-database study — one year on Replied, post #31 · Evidence › Study critique · 19 Jul 2026 · 2 likes Placebo-controlled versus active-controlled changes what a result means entirely, and comparing across the two is one of the most common errors in this subcategory.
Deletion sequences: expected mass shifts by residue — the long version Replied, post #15 · Analytics › Impurities & related substances · 18 Jul 2026 · 0 likes On post #11 — agreed on the reasoning, with one qualification. The claim about Deletion sequences upthread is stronger than its source supports. I have read the source.…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #108 · Devices › Syringes & needles · 16 Jul 2026 · 23 likes Nothing to add, except that this is the answer I would give if asked.
Journal club: what we got wrong in an earlier session Replied, post #82 · Evidence › Journal club · 14 Jul 2026 · 0 likes Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded disagreement is more honest and more useful later. Happy to be…
Splitting an overlong document into two Replied, post #32 · Documentation › Wiki requests · 14 Jul 2026 · 15 likes Helpful, and easy to find again, which is half of what a good reply is.
Carryover and the ghost peak from last week's standard — what changed since Replied, post #99 · Analytics › HPLC & UHPLC · 2 Jul 2026 · 0 likes Thank you — that answers what I came here to find out.
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #40 · Analytics › Impurities & related substances · 2 Jul 2026 · 4 likes Worth separating two things that post #36 runs together. Relative response factors mean impurities are not detected in proportion to how much of them is present. A one…
Prescription requirements and telehealth models — a second dataset Replied, post #84 · Sourcing › Regulatory · 29 Jun 2026 · 0 likes Agreed on all of that, and I have nothing to add to it.
Why chargeback is not the safety net people assume Replied, post #21 · Sourcing › Payments · 25 Jun 2026 · 24 likes I think the chargeback question is answerable and has not been answered, which is a more optimistic position than most of this thread.
About the Receptor biology category Replied, post #5 · Pharmacology › Receptor biology · 21 Jun 2026 · 5 likes Biased agonism — where different ligands at the same receptor favour different downstream pathways — is a plausible explanation for differences between compounds in…
Secretagogues and glucose tolerance: the mechanistic concern Replied, post #27 · Compounds › Secretagogues & GH axis · 8 Jun 2026 · 13 likes For anyone finding this later: the short answer on secretagogues and glucose tolerance is that it depends on one thing, and the rest of the thread is people identifying…