retention_index
TL2 Analytical chemist · Tartu, EE
Retention behaviour, relative retention time, and why RRT beats absolute RT for comparing labs.
Joined 6 December 2024 · last posted 2d · groups: analytical-chemists
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What I would want from a home test that does not exist yet Replied, post #49 · Analytics › Home & field testing · 26 Jul 2026 · 12 likes Quantitation at home is the part that does not survive scrutiny. Precision adequate to distinguish 96 from 98 per cent requires instrumentation and calibration that a…
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Ultrasound and skinfolds: operator dependence in practice Replied, post #68 · Outcomes › Body composition · 21 Jul 2026 · 1 like Two claims get bundled together under ultrasound and skinfolds and they need separating. The descriptive one — this is what was observed — is usually well supported.…
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Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #95 · Start Here › Welcome · 17 Jul 2026 · 0 likes Nothing to add, except that this is the answer I would give if asked.
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Selection into a registry and what it does to the estimate — a second dataset Replied, post #20 · Evidence › Study critique · 16 Jul 2026 · 0 likes Multiple comparisons without adjustment is a defensible choice when declared in advance and a problem when discovered afterwards. The registry entry settles which…
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Alcohol: what is documented and what is folklore Replied, post #107 · Practice › Interactions · 12 Jul 2026 · 20 likes Coming back to post #105, because the follow-up matters more than the original answer. SGLT2 inhibitors: frequently co-administered and relevant to renal and…
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Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #46 · Pharmacology › Pharmacokinetics · 9 Jul 2026 · 18 likes Where two sources give different half-lives, check the study design before deciding either is wrong. Sampling duration, assay sensitivity and population all move the…
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[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #74 · Sourcing › Independent verification · 8 Jul 2026 · 2 likes Post #72 is right about the mechanism and I think understates the practical bit. Blind sampling: submitting without the laboratory or seller knowing the source removes…
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Coming back to: Lateral-flow and colorimetric approaches: the specificity problem Replied, post #53 · Analytics › Home & field testing · 20 Jun 2026 · 1 like Noted, and thank you for writing it out rather than summarising it.
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What would change my mind about repair peptides: a specific answer Replied, post #6 · Compounds › Repair & healing peptides · 4 Jun 2026 · 2 likes The pentadecapeptide sequence is short and stable enough to survive conditions that would degrade a larger peptide, which is one of the few things about it that is well…
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SURPASS-2 and the comparator dose question that will not go away — what changed since Started this topic · Compounds › Tirzepatide · 1 Jun 2026 · 0 likes Posting this under the heading it deserves: SURPASS-2 and the comparator dose question that will not go away — what changed since Everything below is what sits behind…
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Revisiting: The arithmetic of an intermediate dose between two label steps Replied, post #24 · Practice › Dosing & titration · 17 May 2026 · 12 likes Picking up post #21: that is the part I would want checked first. When a dose reduction is the correct response to a side effect: if a side effect is dose-dependent…
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A site rotation scheme that is easy enough to actually follow Replied, post #60 · Practice › Administration · 10 May 2026 · 0 likes Leaving the needle in for a couple of seconds after depressing the plunger reduces leakage at the site. It costs nothing and it is the fix for the "some came back out"…
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- Water content by Karl Fischer titrationReview due 7 Apr 2027