Topic
Study of small-molecule metabolites in biological samples, typically via mass spectrometry, to profile cellular and physiological states.
Sebastian Böcker's Jena group reports in Nature Methods a tool that predicts chromatography retention times on new lab systems without retraining. Whether that makes retention time a dependable filter for identifying unknown molecules depends on how large its prediction errors are.
Reality
University of Copenhagen researchers found blood signs of gut bacteria fermenting more protein in 52 ISS astronauts within weeks of reaching orbit. The team suspects slower digestion and says Mars crews may need countermeasures, though blood chemistry alone cannot confirm the cause.
Reality
Vladimir Boginski's Molecular Community Network connects nearly 95% of mass-spec molecules, so unknowns can take candidate identities from neighbors. Its use for biomarkers depends on how often those predictions survive lab checks, as one class of gut-microbe bile acids has.
Reality
Rather than wait for experimental libraries to fill, the Cornell and BTI tool indexes a chemical space roughly a thousand times wider. What a query returns is a candidate structure rather than a confirmed one.
Reality
Aging clocks compress a great deal into one number. A Science study that measured the same 335 women repeatedly over eight years suggests that compression is safer for gene activity than for metabolites, and that when the blood was drawn matters.
Reality