r.marsden
TL3 Regular · Granada, ES
Laboratory background. Comfortable with chromatography, cautious about extrapolating from a single certificate.
Joined 11 November 2024 · last posted 1d · groups: analytical-chemists
159Posts here
5Topics
0Solutions
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MS/MS sequence confirmation: what it costs and when it is worth it Replied, post #7 · Analytics › Mass spectrometry · 27 Jul 2026 · 0 likes Worth separating two things that post #3 runs together. Resolution: "high resolution" commonly means
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Stepping down deliberately, and how to do it without losing progress — what changed since Replied, post #89 · Practice › Dosing & titration · 23 Jul 2026 · 10 likes Steady state means the plasma concentration is stable from dose to dose. That happens around 4 to 5 half-lives. Before that, the concentration is rising with each dose.…
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0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #115 · Devices › Syringes & needles · 22 Jul 2026 · 19 likes Worth separating two things that post #111 runs together. Sharps disposal: needles and syringes should be disposed in a sharps container (a rigid, puncture-resistant…
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Which categories are strict and which are relaxed, honestly Replied, post #37 · Start Here › Welcome · 22 Jul 2026 · 14 likes The compound and evidence pages are updated regularly and they are worth reading when you are new. They answer the meta questions like "do we have data on this" and…
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Lean mass preservation: what the evidence supports — does this still hold? Replied, post #118 · Outcomes › Body composition · 20 Jul 2026 · 1 like I read post #116 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
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What I would want from a home test that does not exist yet — what changed since Replied, post #101 · Analytics › Home & field testing · 19 Jul 2026 · 21 likes Coming back to post #99, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
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Request: tag synonyms surfaced in search Replied, post #20 · Meta › Feature requests · 17 Jul 2026 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
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Seven-day rolling means and why weekly readings mislead Replied, post #46 · Outcomes › Progress reports · 17 Jul 2026 · 0 likes Menstrual cycle: for people who menstruate, weight can shift by several pounds across the cycle due to fluid retention and other factors. Noting cycle phase when…
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Coming back to: Payment method and the leverage it gives you, ranked Replied, post #20 · Sourcing › Payments · 14 Jul 2026 · 1 like Coming back to post #18, because the follow-up matters more than the original answer. Payment mechanics: most suppliers accept bank transfer, crypto, and some accept…
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A site rotation scheme that is easy enough to actually follow Replied, post #105 · Practice › Administration · 4 Jul 2026 · 0 likes Cold solution and stinging: warming the vial in your hands for a minute before injection reduces the stinging sensation substantially. This is the simplest thing to try…
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GHRH analogues versus ghrelin mimetics: different mechanisms, conflated discussion Replied, post #35 · Compounds › Secretagogues & GH axis · 2 Jul 2026 · 0 likes I read post #33 twice before replying, because I had assumed the opposite. Evidence quality in the secretagogue literature is honestly weaker than in the incretin…
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Carryover and the ghost peak from last week's standard — what changed since Replied, post #88 · Analytics › HPLC & UHPLC · 29 Jun 2026 · 0 likes This is why a purity figure without the underlying chromatogram is weaker evidence than it appears. It is also why two competent laboratories can report different…
Maintains 3 documents
- Semaglutide — referenceReview due 17 Apr 2027
- Counter-ion content and its consequencesReview due 18 Jun 2027
- Janoshik Analytical — what its reports establishReview due 22 Aug 2026