ar.petrov

TL2 · Tampere

Contributes reviews on supplier material. Based in Tampere.

Joined 13 November 2024 · last posted 6h

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About the Mass spectrometry category Replied, post #10 · Analytics › Mass spectrometry · 28 Jul 2026 · 24 likes Picking up post #7: that is the part I would want checked first. Positional isomers and epimers are mass-identical. Any argument that a mass result rules them out is…
Second pass at: Absence of evidence and evidence of absence Replied, post #53 · Research Methods › Statistics · 24 Jul 2026 · 0 likes I disagree with the framing of Absence of evidence above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it can be…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #107 · Analytics › Impurities & related substances · 24 Jul 2026 · 9 likes Disulfide formation: if a peptide contains cysteine, it can form disulfide bonds with itself or with other molecules. Under oxidising conditions multiple species…
Primary endpoint hierarchies and why order matters — one year on Replied, post #57 · Evidence › Trials · 23 Jul 2026 · 33 likes Noted, and thank you for writing it out rather than summarising it.
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #69 · Evidence › Journal club · 16 Jul 2026 · 1 like What I want from this SUSTAIN 6 thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #96 · Data & Tools › Datasets · 15 Jul 2026 · 13 likes Picking up post #93: that is the part I would want checked first. What I want from this community side-effect dataset thread is the list of things that would need to be…
Request: a per-category review queue Replied, post #93 · Meta › Feature requests · 10 Jul 2026 · 0 likes Request: an export of my own posts. Not for any dramatic reason — I want to search my own history offline, and site search is optimised for finding other people's…
A widely repeated interaction claim that turns out to be unsupported — what changed since Replied, post #79 · Practice › Interactions · 6 Jul 2026 · 0 likes The most defensible general position in this subcategory: identify the plausible mechanism, check whether it has been studied, and where it has not, say that rather…
Research-use-only status: what it means legally and practically Replied, post #69 · Compounds › Other compounds · 4 Jul 2026 · 0 likes Speaking only to research-use-only status as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread…
Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #34 · Practice › Reconstitution · 30 Jun 2026 · 7 likes Post #33 answers the question as asked. The question underneath it is different. One caution on Reconstituting a multi-strength kit: everything above assumes the…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #101 · Evidence › Journal club · 29 Jun 2026 · 14 likes If you are new and reading this thread for the answer to indirect comparison: the answer is conditional, the conditions are in the third reply, and the rest of the…
A revision dispute resolved on the topic rather than in the history Replied, post #10 · Meta › Wiki maintenance · 27 Jun 2026 · 0 likes Post #8 answers the question as asked. The question underneath it is different. Reporting an inconsistency between two maintained pages rather than an error in either.…