b.kowalski

TL2 Moderator · Oulu

Contributes reviews on supplier material. Based in Oulu.

Joined 28 September 2024 · last posted 12d

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The most useful thing you learned here that was not the answer you came for Replied, post #59 · Lounge › Off topic · 16 Jul 2026 · 0 likes Community norms: if you want to discuss how the community should work (not moderation decisions, which go in Meta) the Lounge is a place for that casual discussion.
What a certificate commits its issuer to Replied, post #29 · Analytics › COA interpretation · 14 Jul 2026 · 28 likes Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide content independent of chromatographic purity. Very…
Revisiting: The best-written scientific paper you have read Replied, post #77 · Lounge › Off topic · 8 Jul 2026 · 4 likes Coming back to post #75, because the follow-up matters more than the original answer. Humour: light, relevant humour is welcome. Cruel humour targeting individuals or…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #98 · Devices › Syringes & needles · 7 Jul 2026 · 22 likes Worth separating two things that post #94 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #39 · Analytics › Mass spectrometry · 6 Jul 2026 · 7 likes Mass accuracy is expressed in parts per million. It is the difference between observed and theoretical mass divided by theoretical mass, multiplied by a million. A…
Revisiting: Protein density versus volume when you cannot eat much Replied, post #36 · Nutrition & Training › Protein & intake · 6 Jul 2026 · 2 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #65 · Evidence › Journal club · 28 Jun 2026 · 6 likes SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight reduction for a pharmacological intervention at publication. Read the categorical…
What a reversed-phase purity number actually is Replied, post #6 · Analytics › HPLC & UHPLC · 27 Jun 2026 · 6 likes Column chemistry and particle size: smaller particles (1.7 μm) give better resolution and higher efficiency than larger particles (3.5 μm or 5 μm), at the cost of…
Programming during a large energy deficit Replied, post #25 · Nutrition & Training › Resistance training · 26 Jun 2026 · 0 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #83 · Practice › Reconstitution · 14 Jun 2026 · 32 likes The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common arithmetic error in this subcategory. The habit that catches it:…
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #48 · Analytics › Home & field testing · 12 Jun 2026 · 24 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Injecting into an area that has become firm: why not to Replied, post #42 · Practice › Administration · 9 Jun 2026 · 0 likes A genuinely late dose: the labelling generally says that if the next dose is more than a couple of days away, take it as soon as you notice. If the next dose is close,…