k.perrin
TL2 · Galway
Contributes reviews on supplier material. Based in Galway.
Joined 7 December 2024 · last posted 2d
84Posts here
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Muscle cramps: the ordinary causes before the exotic ones Replied, post #21 · Practice › Side effects · 14 Jan 2026 · 31 likes Worth separating two things that post #17 runs together. Adding a reference point for muscle cramps. Mine is a single case, collected without controls, and I am posting…
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Journal club: STEP 4 and what a withdrawal design can prove Replied, post #64 · Evidence › Journal club · 26 Jun 2025 · 29 likes The confident answers on STEP 4 and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this category.
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Mass error in ppm: the arithmetic and the caveat Replied, post #39 · Analytics › Mass spectrometry · 13 Feb 2026 · 27 likes Sample preparation for mass spectrometry can itself introduce modifications, particularly oxidation. A finding at trace level may be telling you about the preparation…
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"Greater than or equal to 99%" as a specification rather than a result Replied, post #67 · Analytics › COA interpretation · 8 Nov 2025 · 27 likes Worth separating two things that post #65 runs together. A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is enough…
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What I would want from a home test that does not exist yet — what changed since Replied, post #65 · Analytics › Home & field testing · 23 Jun 2026 · 26 likes Ultraviolet absorbance at 280 nanometres estimates concentration for peptides containing aromatic residues and gives nothing for peptides that do not. Knowing which…
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How to read a forest plot, properly, from scratch Replied, post #77 · Evidence › Trials · 28 Dec 2025 · 25 likes Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the practical magnitude. The event rate in each arm and the difference between…
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