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414 topics · page 2 of 14

Topic	Participants	Replies	Views	Activity
What a reversed-phase purity number actually is Analytics › HPLC & UHPLC HPLC system suitability data table peak integration Solved The question in the title: What a reversed-phase purity number actually is I will give what I have already checked below so nobody repeats it. I would like to understand what this number means before I repeat…	+87	101	27k	4h
Reused chromatograms across lots: how to spot it Analytics › COA interpretation batch & lot numbers amino acid analysis documentation quality certificate of analysis On the subject in the title: Reused chromatograms across lots: how to spot it Working notes rather than a conclusion. Something about reused chromatograms across lots does not reconcile and I would like a…	+53	60	9.5k	4h
When a network meta-analysis is defensible and when it is not Evidence › Meta-analyses effect size heterogeneity publication bias Solved When a network meta-analysis is defensible and when it is not I have a specific reason for asking rather than idle curiosity, and the context is below. Network meta-analysis, from the point of view of someone…		2	27k	4h
How the vendor documentation pages are maintained, and by whom Sourcing › Vendor reports certificate of analysis Janoshik Analytical batch & lot numbers documentation quality Solved How the vendor documentation pages are maintained, and by whom I have a specific reason for asking rather than idle curiosity, and the context is below. Vendor documentation pages keeps being re-asked here…		2	6k	4h
Mobile reading experience on long topics Meta › Site feedback site feedback moderation guidelines Mobile reading experience on long topics Writing it up because I had to work it out twice and would rather nobody else did. Process question, and I have read the guidelines before asking. I understand the…		2	14k	4h
Named, unnamed and unspecified impurities as regulatory categories — the long version Analytics › Impurities & related substances HPLC data table forced degradation counter-ion content Wiki Named, unnamed and unspecified impurities as regulatory categories — the long version — setting out what I have, and where I think it stops being reliable. Two reports on the same lot, and I would like help…	+112	120	7.6k	5h
Repeatability versus intermediate precision — what changed since Analytics › Method validation recovery precision & repeatability linearity system suitability Posting this under the heading it deserves: Repeatability versus intermediate precision — what changed since Everything below is what sits behind that. What changes if the standard account of Repeatability…		4	21k	5h
Chain of custody for a sample you posted yourself Sourcing › Independent verification PeptideMeter third-party testing Janoshik Analytical blind sampling Chain of custody for a sample you posted yourself Writing it up because I had to work it out twice and would rather nobody else did. I was wrong about chain of custody in a thread last spring and I would like…		2	7.3k	5h
Sleep quality changes during weight loss Wellbeing › Sleep heart rate obstructive sleep apnoea fatigue On the subject in the title: Sleep quality changes during weight loss Working notes rather than a conclusion. Asking about sleep quality changes during weight on behalf of the question I keep seeing asked…	+27	31	555	5h
What other technical communities get right that we do not Lounge › Off topic beginner friendly long read Wiki What other technical communities get right that we do not — that is the question, and I have not found it answered plainly anywhere I have looked. A digression I have been saving for the right category. It is…	+2	6	23k	5h
About the Mass spectrometry category Analytics › Mass spectrometry LC-MS high-resolution MS mass error (ppm) Pinned Wiki LC-MS and high-resolution MS, charge states, mass accuracy in ppm, and what identity confirmation does and does not establish. This post is a community wiki: any member at trust level 3 or above can edit it,…	+5	9	19k	6h
What TRIUMPH is designed to answer, and why we should not pre-empt it Compounds › Retatrutide retatrutide effect size TRIUMPH programme preprint Solved What TRIUMPH is designed to answer, and why we should not pre-empt it I have a specific reason for asking rather than idle curiosity, and the context is below. TRIUMPH keeps being re-asked here and I think…	+4	8	142	6h
Second pass at: Orforglipron as a non-peptide: what changes when the molecule is small Compounds › Oral incretins PIONEER programme orforglipron randomised trial SOUL trial Second pass at: Orforglipron as a non-peptide: what changes when the molecule is small Writing it up because I had to work it out twice and would rather nobody else did. Posting a small dataset on…		2	17k	6h
Sulfonylureas: the interaction most worth taking seriously Practice › Interactions needs a source metformin insulin Sulfonylureas: the interaction most worth taking seriously Writing it up because I had to work it out twice and would rather nobody else did. An honest uncertainty about sulfonylureas rather than a disguised…	+4	8	38k	6h
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Analytics › HPLC & UHPLC HPLC system suitability gradient method Detection wavelength and why 214 nm and 280 nm disagree — setting out what I have, and where I think it stops being reliable. I would like to disagree carefully with the settled view on Detection wavelength,…	+69	76	920	6h
What I would want from a home test that does not exist yet Analytics › Home & field testing ELISA documentation quality LOD & LOQ Solved Pinned The question in the title: What I would want from a home test that does not exist yet I will give what I have already checked below so nobody repeats it. Two reports on the same lot, and I would like help…	+46	50	8k	6h
A supplier who responds to a discrepancy with silence — what changed since Sourcing › Red flags mislabelling disputed documentation quality underdosing Wiki A supplier who responds to a discrepancy with silence — what changed since — setting out what I have, and where I think it stops being reliable. What changes if the standard account of supplier is wrong? I…	+83	88	21k	6h
Revisiting: Drawing from a pen cartridge with a syringe: how the risk profile changes Devices › Pens & autoinjectors dead volume missed dose storage subcutaneous injection Revisiting: Drawing from a pen cartridge with a syringe: how the risk profile changes Writing it up because I had to work it out twice and would rather nobody else did. Question about a metering device rather…		2	18k	6h
[2026 update] Correlation in a self-tracked dataset: what it can support Research Methods › Statistics number needed to treat effect size worked example heterogeneity Posting this under the heading it deserves: Correlation in a self-tracked dataset: what it can support Everything below is what sits behind that. Posting a small dataset on Correlation. It is mine, it is…		2	31k	6h
SURPASS-2 and the comparator dose question that will not go away — what changed since Compounds › Tirzepatide SURMOUNT programme tirzepatide effect size 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 that. What changes if the standard…	+2	6	5.5k	7h
Compounds this community declines to help with, and why — does this still hold? Compounds › Other compounds custom synthesis research use only mislabelling Compounds this community declines to help with, and why — does this still hold? — that is the question, and I have not found it answered plainly anywhere I have looked. Putting the numbers in the first post,…	+3	7	26k	7h
Reconstituting a multi-strength kit without mixing yourself up — what changed since Practice › Reconstitution concentration maths syringe units bacteriostatic water On the subject in the title: Reconstituting a multi-strength kit without mixing yourself up — what changed since Working notes rather than a conclusion. What changes if the standard account of Reconstituting…	+42	46	1k	7h
A site rotation scheme that is easy enough to actually follow — a second dataset Practice › Administration subcutaneous injection needle gauge & length injection site rotation missed dose A site rotation scheme that is easy enough to actually follow — a second dataset Writing it up because I had to work it out twice and would rather nobody else did. Two things I would like separated before…	+6	10	1.2k	7h
Isotope patterns and why the monoisotopic peak is not the tallest — does this still hold? Analytics › Mass spectrometry charge states counter-ion content high-resolution MS mass error (ppm) Solved Isotope patterns and why the monoisotopic peak is not the tallest — does this still hold? — that is the question, and I have not found it answered plainly anywhere I have looked. Asking about Isotope patterns…		2	4.6k	7h
Reading a home test result without over-claiming Analytics › Home & field testing ELISA documentation quality LOD & LOQ third-party testing Reading a home test result without over-claiming — setting out what I have, and where I think it stops being reliable. Collecting what is known about reading a home test result in one place, because it is…	+124	137	19k	7h
Joined after a search result and stayed Lounge › Introductions beginner friendly onboarding Posting this under the heading it deserves: Joined after a search result and stayed Everything below is what sits behind that. Saying hello, and stating my interest so that it is on the record rather than…	+5	9	26k	7h
Documenting a supplier's response to a discrepancy Sourcing › Vendor reports third-party testing documentation quality batch & lot numbers Solved On the subject in the title: Documenting a supplier's response to a discrepancy Working notes rather than a conclusion. A question about how a record should be read rather than about a supplier. We have…	+44	49	589	8h
Coming back to: Why our vendor pages link the storefront and mark it sponsored Sourcing › Vendor reports third-party testing batch & lot numbers certificate of analysis documentation quality Why our vendor pages link the storefront and mark it sponsored I have a specific reason for asking rather than idle curiosity, and the context is below. Reading back through what has been written here about…		2	22k	8h
Revisiting: Body image changing more slowly than the body Wellbeing › Mental health disordered eating mood beginner friendly Solved Posting this under the heading it deserves: Revisiting: Body image changing more slowly than the body Everything below is what sits behind that. What changes if the standard account of Body image is wrong? I…	+5	9	28k	8h
The SOUL trial and oral semaglutide cardiovascular outcomes Compounds › Oral incretins orforglipron oral semaglutide SOUL trial PIONEER programme Posting this under the heading it deserves: The SOUL trial and oral semaglutide cardiovascular outcomes Everything below is what sits behind that. Collecting what is known about SOUL trial and oral…		2	7.1k	9h