The Signal Report // LAB SCIENCE
Lab Science.
The methods behind the headline result, and where the press release outran the paper. All reports →
29 in this beat · page 1 of 3
What an RNA integrity number measures
The RIN on your sequencing report feels like a measurement. It is a small neural network trained in 2006 to imitate how experts graded 1,208 ribosomal RNA traces. A good tool, but in a controlled test, blood samples still averaging RIN 7.9 had already shifted 4% of their genes. How to use the number without letting it be the judge.
Read the report → Report 175 · Lab Science · 2026-10-03 · 5 minWhat "99% pure by HPLC" means
The purity line on a certificate of analysis usually reports the main peak as a share of what a UV detector could see. Water, salts and silica make no peak, and impurities are weighted by how strongly they absorb. One catechin standard read 100.0% by HPLC and 95.8% by quantitative NMR.
Read the report → Report 169 · Lab Science · 2026-09-30 · 7 minHow a molecule is found in space
The first individual PAHs found in interstellar space (2021) were detected by stacking hundreds of radio lines that were each buried in noise; for one molecule, not a single line was visible. It only worked because a lab had measured the spectra to about a kilohertz, and the authors showed the detection collapses when the frequencies are slightly wrong.
Read the report → Report 163 · Lab Science · 2026-09-26 · 8 minWhen Beer's law breaks down
A = εcl is taught as a law of nature. A 2020 ChemPhysChem review argues it is a limiting law like the ideal gas law: excellent for dilute solutions in thick cuvettes, and wrong by tens of percent for thin films, reflective substrates, ATR and concentrated or patchy samples, even with a perfect instrument. The authors suggest renaming it the ideal absorption law.
Read the report → Report 157 · Lab Science · 2026-09-22 · 8 minAn R² of 0.999 is not a linearity test
"Linear, R² = 0.999" is how most calibration curves get defended. That number measures how tightly points hug a line, not whether a line is the right shape. Cadmium AAS curves with r above 0.997 still failed lack-of-fit, and ICH and Eurachem both point to the residuals instead.
Read the report → Report 151 · Lab Science · 2026-09-19 · 10 minWhat a DLS particle size actually is
Dynamic light scattering never images a particle. It times a flickering speckle pattern and infers a diameter, weighted by the sixth power of size, so one aggregate can move the answer. ISO 22412's own definition says the exact nature of the number depends on which algorithm you ran, and a NIST study found the polydispersity index that everyone leans on to be completely unreliable.
Read the report → Report 145 · Lab Science · 2026-09-13 · 10 minWhat a Brillouin microscope actually measures
Brillouin maps of cells get captioned as stiffness. The instrument reads out a frequency shift and a linewidth in gigahertz, and turning those into a modulus needs refractive index and density it usually assumes. The result is a longitudinal modulus, gigapascals where AFM reports kilopascals, and in wet samples water sets most of it. What the 2025 consensus statement says to report, and how to read the figure.
Read the report → Report 140 · Lab Science · 2026-09-10 · 14 minFour errors, one retracted Nature paper
Nature retracted a widely cited drought paper in September 2026, and the note names exactly four problems. A global average computed without weighting grid cells by area, an old version of a dataset left in one figure, a date-parsing bug in a subsetting step, and a mask applied to one panel but not the next. None of them is about climate. All four are about the plumbing between the data and the number, and peer review could not have caught any of them.
Read the report → Report 134 · Lab Science · 2026-09-07 · 10 minIs science really becoming less disruptive?
A 2023 Nature paper reported that papers and patents had grown steadily less disruptive. Records listing zero references score as perfectly disruptive by construction, and older records are likelier to be missing their references. The critique published this August puts 93 percent of the decline down to that artefact. The original authors replied the same day.
Read the report → Report 128 · Lab Science · 2026-09-04 · 9 minYour 260/280 Is Measuring Your Buffer
The gap between "pure DNA" at 1.8 and "pure RNA" at 2.0 is 0.2. Solution pH is worth 0.2 to 0.3 on its own. Two spectrophotometers that both meet a 1 nm wavelength specification can disagree by 0.4 on the same tube. And every template has its own correct answer, because the five bases do not share a ratio. All of it is documented, by the instrument makers, in the bulletins that ship with the method.
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