[Discussion] we are measuring concentration at the wrong time and calling it noise
Posting this as a discussion rather than a claim: we are measuring concentration at the wrong time and calling it noise. Why "more water" keeps confusing people, including me for a month. The vial contains a fixed amount of peptide. Water changes nothing about that amount. What it changes is concentration, and…
Spent 9 weeks confused about this until somebody drew the table for me. 15mg, 3mL, 5mg/mL, 2mg is 40 units. That is the whole thing.
Research-use-only material is not approved for human use, so treat everything in this thread as arithmetic about solutions rather than instructions for a person.
Reconstituted at 2mL when I meant to use a different volume. Caught it because the units looked wrong on the barrel. Now I write 5mg/mL on the glass before I put the cap back.
Yes, and the dead-space point is worth repeating: it is small, it is real, and it is the same for every draw.
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Are you accounting for the powder volume, or is that where the confusion is?
I keep a laminated card in the drawer with the arithmetic on it. Looks ridiculous. Has never once let me draw the wrong volume.
This. Showing the working is the fastest way for somebody else to spot the mistake.