GLPHubglpresearchhub.com
Read-only archive. GLP Research Hub is a static community record — nothing here is for sale, no account is needed, and no vote you cast is counted. Why?
MA

u/mass_spec_maggie

LC-MS/MS is my day job. Peptide mapping is my hobby. Both are the same job.

long-standing contributor · MS · joined 19 Jan 2024

16,066post karma
15,704comment karma
5submissions
100comments

Comments — page 3 of 3

comment on genuine question about HPLC that I am slightly embarrassed to ask in c/hplc · 1.1k points · 1 year ago

Trace posted without axis labels — asked for a relabelled version rather than removing it.

permalink

comment on dose history — my 20-week log, condensed into one table in c/dosinglogs · 0 points · 1 year ago

Contemporaneous records do not drift; reconstructed ones do, and the drift is systematic rather than random because memory smooths.

marit_laurent is right about blanks. Silent gaps make the series lie.

permalink

comment on how much of what we believe about gradient actually comes from purity threads in c/hplc · 348 points · 1 year ago

Trace posted without axis labels — asked for a relabelled version rather than removing it.

permalink

comment on help me understand method development, I have read the wiki twice in c/hplc · 26 points · 2 years ago

Left up. The integration disagreement in this thread is the most useful thing on the board this week.

permalink

comment on why does nobody talk about waist in c/dosinglogs · 59 points · 2 years ago

Why contemporaneous beats reconstructed, with the failure mode.

Memory smooths. Reconstructing a fortnight from recollection produces a series that is more regular, more consistent with your current beliefs, and quietly wrong in a direction that flatters the story you are already telling.

I found this out by reconstructing six weeks and later finding order receipts that contradicted my own entries. The log was not a little wrong; it was wrong in exactly the direction that made my narrative work. Write it down on the day, even the boring days, especially the boring days.

permalink

comment on how much of what we believe about weekly update actually comes from tracking threads in c/dosinglogs · 11 points · 2 years ago

Why contemporaneous beats reconstructed, with the failure mode.

Memory smooths. Reconstructing a fortnight from recollection produces a series that is more regular, more consistent with your current beliefs, and quietly wrong in a direction that flatters the story you are already telling.

I found this out by reconstructing six weeks and later finding order receipts that contradicted my own entries. The log was not a little wrong; it was wrong in exactly the direction that made my narrative work. Write it down on the day, even the boring days, especially the boring days.

permalink

comment on nobody warned me about constipation and I would have liked the warning in c/sideeffects · -11 points · 2 years ago

The pattern almost everyone here describes, written out once so it can be linked.

A step up is followed by a rough window — commonly muscle cramps arriving the day after the shot and easing by day four, worst in the first fortnight, then flattening out. At a stable dose it usually settles further. Constipation and fatigue tend to track intake and fluid rather than the compound directly, which is why the unglamorous answers work.

What sits outside that pattern: severe pain, symptoms that appear from nowhere weeks into a stable dose, or anything getting worse rather than better over a month. None of that is a board question and none of us can answer it for you.

permalink

comment on my hs-CRP moved and I cannot work out whether dose stretching is why in c/maintenancephase · 22 points · 2 years ago

the habits are the part that has to outlive the dose

permalink

comment on [Lab] KP cagri — VendorInvestigate came back 98.1% against a claimed 97.5% in c/hplc · 1 points · 2 years ago

This. A shoulder that does not baseline-resolve is a question, not a quantity.

permalink

comment on genuine question about reflux that I am slightly embarrassed to ask in c/sideeffects · 340 points · 2 years ago

Agreed. Slowing down at meals did more for my reflux than everything I bought to fix it, which was embarrassing to discover.

permalink

comment on [Question] is 94.2% actually fine or am I being sold a rounding error in c/hplc · 86 points · 2 years ago

Careful — you are treating retention time as identity. Two things can co-elute and the trace will not tell you.

permalink

comment on [Question] how do you actually verify gradient in c/hplc · 819 points · 2 years ago

Method questions stay here; supplier claims go to c/vendorvetting with a document attached.

permalink

comment on small win: fatigue stopped being a problem at week 82 in c/sideeffects · 835 points · 2 years ago

Severe or persistent abdominal pain sits outside the pattern this board can usefully discuss. The honest answer there is that it needs someone who can examine you.

permalink

comment on chromatogram is the most under-discussed thing on this board in c/hplc · 247 points · 2 years ago

Method questions stay here; supplier claims go to c/vendorvetting with a document attached.

permalink

comment on [Meta] the method development rule is doing its job and people should stop complaining in c/hplc · 1.1k points · 2 years ago

Retention time shifted 0.4 minutes and I assumed the worst. It was the column temperature.

permalink

comment on genuine question about goal weight that I am slightly embarrassed to ask in c/maintenancephase · 1 points · 2 years ago

Adding one thing — decide what maintenance looks like before you arrive at it.

This reframing is the most useful thing on the board for anyone approaching this phase.

permalink

comment on integration — 17 things I got wrong before I got it right in c/hplc · 6 points · 2 years ago

Trace posted without axis labels — asked for a relabelled version rather than removing it.

permalink

comment on gradient — 17 things I got wrong before I got it right in c/hplc · 27 points · 2 years ago

Retention time shifted 0.4 minutes and I assumed the worst. It was the column temperature.

permalink

comment on [Discussion] heart rate is doing more work than we give it credit for in c/sideeffects · 677 points · 2 years ago

Hair shedding after significant weight loss is a telogen effect that follows the rate of loss. It is not specific to these compounds and it resolves.

permalink

comment on nobody warned me about fatigue and I would have liked the warning in c/sideeffects · 147 points · 2 years ago

hair shedding follows the weight loss, not the drug, and it stops

permalink

Trophy case
Posted a Chromatogram Top Contributor
Cake day 19 Jan 2024
Sponsored

Sigma-Aldrich Standards

Certified reference materials for peptide identity and purity work.

sigmaaldrich.com
Where they post
Before you read on

Several compounds discussed on GLP Research Hub are sold for research use only and are not approved for human use anywhere. Nothing here is medical advice and none of it is written by your clinician. If a post reads like an instruction, treat it as a description of what one stranger did.