j.petrov

TL2 Moderator · Kuopio

Contributes reviews on supplier material. Based in Kuopio.

Joined 9 July 2025 · last posted 13h · groups: translators

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[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #76 · Analytics › HPLC & UHPLC · 27 Jul 2026 · 32 likes Detection wavelength: 214 nm detects the peptide bond and is relatively insensitive to composition. 280 nm detects aromatic residues and is strongly…
The anatomy of a question that gets answered within an hour Replied, post #124 · Start Here › How to Ask · 24 Jul 2026 · 7 likes Units. Everything needs units. This is why we ask every single time. I have seen the same arithmetic done three different ways depending on whether the person was…
Immortal time bias in a claims-database study — one year on Replied, post #30 · Evidence › Study critique · 18 Jul 2026 · 24 likes I read post #28 twice before replying, because I had assumed the opposite. Generalisability: do the inclusion/exclusion criteria narrow the population so much that…
Reading a rodent study on a secretagogue without over-extrapolating — the long version Replied, post #43 · Compounds › Secretagogues & GH axis · 16 Jul 2026 · 12 likes Coming back to post #41, because the follow-up matters more than the original answer. Why this subcategory is stricter about sourcing than most: the evidence base is…
Second pass at: Leak-back after withdrawal and whether you lost a meaningful dose Replied, post #23 · Practice › Administration · 3 Jul 2026 · 31 likes Injecting into an area that has become firm: lipohypertrophy — thickened fatty tissue from repeated injection in one area — changes local tissue absorption. Avoid…
Why we ask for units every single time, with three examples of what goes wrong Replied, post #91 · Start Here › How to Ask · 2 Jul 2026 · 3 likes Coming back to post #89, because the follow-up matters more than the original answer. The specific question in the title is more useful than you might think. A title…
Spreadsheets: an appreciation — what changed since Replied, post #88 · Lounge › Off topic · 2 Jul 2026 · 10 likes Personal stories: if you want to talk about what led you to this compound, your journey, or how the change has affected your life, the Lounge is the place for that.
Why we ask for units every single time, with three examples of what goes wrong Replied, post #74 · Start Here › How to Ask · 26 Jun 2026 · 8 likes This follows post #71 rather than contradicting it. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still…
The headache that turns out to be dehydration — the long version Replied, post #51 · Nutrition & Training › Hydration & electrolytes · 15 Jun 2026 · 21 likes Water intoxication: drinking excessive water (more than a few liters per day for extended time) without electrolyte replacement can cause hyponatremia. This is rare but…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #73 · Compounds › Semaglutide · 7 Jun 2026 · 1 like The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument…
Request: a per-category review queue Replied, post #19 · Meta › Feature requests · 4 Jun 2026 · 27 likes post #18 is right about the mechanism and I think understates the practical bit. I disagree with the reply above, and I think the disagreement is substantive rather…
Second pass at: Absence of evidence and evidence of absence Replied, post #14 · Research Methods › Statistics · 3 Jun 2026 · 20 likes Power and sample size: a study might be too small to detect a real effect (low power). Sample size calculations help determine how many participants are needed to…