Tag

quantification

Articles tagged quantification. Tags group methods across clusters so a technique can be found from more than one route.

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8 articles

Gloved hands pouring acrylamide solution between glass plates in a gel casting stand

protein biochemistry

Activity assays versus abundance

Milligrams per millilitre are not enzyme units. Specific activity joins rate and mass, and a pure inactive protein differs from a crude active one.

8 October 2026 · 6 min read

protein biochemistry

Comparing quantification assays for a lysate

Bradford, BCA and absorbance at 280 nm on a dirty lysate: which interference wins, why two kits disagree, and which standard to name.

8 October 2026 · 8 min read

Gloved hand closing the lid of a benchtop PCR thermal cycler holding a strip of PCR tubes, city lights at dusk behind

pcr amplification

Digital PCR partitions and precision

Choose digital PCR when you need a presence count from partitions, and see why that precision tracks partition number and the rare-event fraction.

8 October 2026 · 8 min read

Gloved hands sealing a white qPCR plate with optical film using an applicator

pcr amplification

Endpoint PCR compared with qPCR

Trace the failure when endpoint band brightness is treated as a quantity, or a qPCR Cq is used with no standard and no reference-gene plan.

8 October 2026 · 8 min read

Gloved fingers placing a silica spin column into a collection tube beside a tube rack and pipette tips

nucleic acid purification

Fluorometric versus absorbance quantification

Choose a dye assay when double-stranded DNA must be counted, and absorbance when you need a fast check of everything that absorbs at 260 nm.

8 October 2026 · 8 min read

Mass spectrometer coupled to a liquid chromatography system with sample vials in the foreground

proteomics

From spectra to a biological claim

From a raw spectrum to a sentence a biologist may say: identification, a designed contrast, an orthogonal check, and the claim a cell study can actually support.

8 October 2026 · 7 min read

proteomics

Label-free versus labelled quantification

When a label-free fold change disagrees with a blot, or a labelled ratio looks compressed, check missing values, batch effects, shared peptides and co-isolation.

8 October 2026 · 9 min read

nucleic acid purification

Quantifying DNA with a spectrophotometer

A spectrophotometer number is a concentration only after a blank and a pathlength. Compare a pedestal with a cuvette before you trust the reading.

8 October 2026 · 8 min read