[The University of Osaka] The truth is out there – but identifying signs of life in space involves an intense search for biosignatures within our solar system and beyond. However, […]
Biochemistry & Organic Chemistry
Posted inGenomics, Proteomics, Bioinformatics
Generating Eukaryotic Reference Genome Assemblies: Earth BioGenome Project Quality Standards And Recommendations
[q-bio.GN] Reference genome assemblies are foundational resources across the biological sciences as they begin to expose the fundamental building blocks of each species and the molecular toolkits vital for adaptation […]
![Color maps showing statistical uncertainties on the line-of-sight CH3CN Doppler shifts, for four epochs (2016-08-19 to 2022-08-01). Titan’s wireframe grid is shown for each epoch, with the spatial resolution (elliptical beam FWHM) indicated lower left.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Temporal-Variability.png?resize=1200%2C735&ssl=1)
Posted inTitan
Temporal Variability of Titan’s Middle-Atmospheric Zonal Winds from Southern Fall to Late Winter (2016-2023)
[astro-ph.EP] Previous ALMA observations have revealed unexpectedly strong and rapid variations in Titan’s high-altitude equatorial zonal winds, which present a challenge to our understanding of this moon’s atmospheric dynamics.
Posted inAstrochemistry
The JWST Proto-PAH Project: Aromatic Backbones With Extensive Aliphatic Substitution Account For Both The Aromatic And Aliphatic mission
[astro-ph.GA] We find that the aromatic and aliphatic emission bands in four carbon-rich post-asymptotic giant branch stars with class D emission arise from a single carrier population: extensive aliphatic decoration […]
![Schematic representation of the evolution of sulfur in light of our experiments. The diagram provides a conceptual overview of sulfur depletion driven by visual extinction.-- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Thermally.png?resize=1200%2C719&ssl=1)
Posted inAstrochemistry
Thermally Irreversible Sulfur Chemisorption On Silicate Grains As A Major Sulfur Reservoir In Molecular Clouds
[astro-ph.GA] Sulfur (S) chemistry in the interstellar medium remains poorly constrained due to the longstanding “missing sulfur” problem, where a significant fraction of cosmic sulfur in molecular clouds remains unidentified.
![Initial 𝑎c–𝑒c distribution of the 32,000 comets used in each end-to-end calculation. Dashed lines mark the semimajor axes of P7 and P8. The circular and eccentric planet calculations use identical comet initial states.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Planetary.png?resize=1200%2C604&ssl=1)
Posted inComets and Asteroids
Planetary Eccentricity Enhances Inward Comet Transport But Suppresses Gentle Impacts
[astro-ph.EP] Comets can supply volatile and prebiotic material to rocky planets, but survival of fragile molecules depends on atmospheric entry and impact. Compact planet chains can transfer comets inward at […]
![Illustration of the different size averages for Renazzo (after the data of Ebel et al. (2024)) on a back-scattered electron image of polished section 719sp3 of the Muséum national d’Histoire naturelle collection (Jacquet et al., 2012).-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Chondrule.png?resize=1200%2C720&ssl=1)
Posted inAstrogeology
Chondrule Size Averaging In Two And Three Dimensions
[astro-ph.EP] Chondrule sizes are an important discriminant of chondrite groups and chondrule formation theories. Yet most studies report 2D sizes without attempting the somewhat tedious corrections to 3D proposed in […]
![Transmission spectra of TRAPPIST-1 c from the four JWST/NIRSpec PRISM epochs (4-pixel bins, 0.8–5.0 𝜇m), offset vertically by 200 ppm per epoch for clarity and colour-coded by date, with the inverse-variance-weighted mean spectrum (black, plotted at its true depth). Grey bands mark the stellar H2O features near 1.4 and 1.85 𝜇m. The dotted line marks 2.0 𝜇m, the boundary of the region where the contamination is strongest (Section 3). The 2023 November 8 visit contains a flare during transit and the 2024 July 9 visit shows activity outside transit (Section 2.5). -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Detecting.png?resize=1200%2C716&ssl=1)
Posted inAstronomy & Telescopes
Detecting Atmospheres In The Presence Of Stellar Contamination: An Empirically Calibrated Framework Applied To Four JWST/NIRSpec PRISM Transits Of TRAPPIST-1c
[astro-ph.EP] Transmission spectroscopy of rocky exoplanets orbiting late M dwarfs is limited by stellar contamination rather than photon noise.
![The per-tile processing chain, applied to the Detector-4 tile of Fig. 1. (a) After flag masking and zodiacal-light subtraction, the input to the stellar subtraction. (b) After fitting and subtracting the empirical PSF at every catalogued source above the magnitude limit, with the saturated cores of the brightest stars masked. (c) After the median filter and the Gaussian smoothing to 2.6 ′ , which is what is coadded into the HEALPix maps. All three panels share a single histogram-equalised colour scale. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/A-Full-Sky.png?resize=1200%2C637&ssl=1)
Posted inAstrochemistry
A Full-Sky SPHEREx Map of Integrated 3.3 And 3.4 μm PAH Emission
[astro-ph.GA] Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the interstellar medium and are among its smallest carbonaceous grains.
Posted inGenomics, Proteomics, Bioinformatics
Chemical Structure Of RNA With Thiophosphate-modified Linker
[Tokyo Metropolitan University] Original source (Japanese) https://kyodonewsprwire.jp/release/202609246495 Points We discovered that the linkers (connection points) between ribosomal RNA (rRNA) and transfer RNA (tRNA) in archaea, microorganisms that inhabit high-temperature environments, […]