Results 91 to 100 of about 549,270 (251)
The study of comets, part 2 [PDF]
Flyby missions and systematic observations of comets are projected for studying comet nuclei and cometary dust tail ...
Ahearn, M. +4 more
core +1 more source
Lead-induced DNA damage in Vicia faba root cells: Potential involvement of oxidative stress [PDF]
, 2011 Genotoxic effects of lead (0–20 µM) were investigated in whole-plant roots of Vicia faba L., grown hydroponically under controlled conditions. Lead-induced DNA damage in V.
Jean, Séverine +3 more
core +2 more sources
Anhydrous minerals in asteroid Bennu: Evidence for well‐preserved primordial components
Meteoritics &Planetary Science, EarlyView.Abstract Aqueously altered carbonaceous astromaterials are dominated by secondary minerals, but a minor fraction of primary, anhydrous silicates and oxides escape alteration, offering insight into the original composition of asteroid parent bodies. We report the mineralogy, petrology, mineral chemistry, and oxygen isotopes of anhydrous minerals—50 ...
S. S. Russell +23 more
wiley +1 more source
Down But Not Out: The Case of Long-period Comet C/2021 O3 (Panstarrs)
The Astronomical JournalWe combine ground- and space-based observations of long-period comet C/2021 O3 (Panstarrs; perihelion distance 0.287 au) in order to investigate its reported near-perihelion destruction.
David Jewitt +3 more
doaj +1 more source
Photochemistry and Photobiology, EarlyView.Exposure to artificial light at night (ALAN), particularly at blue wavelengths, disrupts circadian rhythms by suppressing melatonin, thereby increasing cancer susceptibility. This systematic review consolidates evidence linking prolonged ALAN exposure to an elevated risk of breast and prostate tumors.
Gabriel Barboza +4 more
wiley +1 more source
The past year was one of tremendous activity because of the appearance of Halley's Comet. Observations of the comet were collected from a number of sources and compared with the detailed predictions of the comet thermal modeling program.
Kieffer, Hugh H., Weissman, Paul R.
core +1 more source
Direct evidence of singlet molecular oxygen [O2 (1Δg)] production from UVA excited 6‐thioguanine
Photochemistry and Photobiology, EarlyView.6‐Thioguanine (6‐TGua) is incorporated into DNA as a purine analogue, inhibiting cell replication. Patients treated with 6‐TGua are more prone to developing skin cancer due to the photoexcitation of 6‐TGua by UVA radiation (as illustrated in the Jablonski diagram). Upon exposure to UVA, the excited 6‐TGua generates 1O2.
André L. Lopes +6 more
wiley +1 more source
The Astrophysical Journal LettersWe report the detection of the nucleus of interstellar object 3I/ATLAS, using a nucleus extraction technique on Hubble Space Telescope (HST) observations taken between 2025 December and 2026 January.
Man-To Hui +4 more
doaj +1 more source
Observations of NH2, OI, CH, CO(+), CO2(+), H2O(+), and N2(+) in optical spectra of comets represent ionization and dissociation product abundances of N2, NH3, H2O, CH4, CO2, and CO.
Wyckoff, Susan
core +1 more source
International Journal of Cancer, Volume 158, Issue 12, Page 3173-3186, 15 June 2026.What's new? Errors in DNA double‐strand break (DSB) repair can lead to mutations, chromosomal instability, and ultimately cancer. Inhibitor of DNA‐binding 3 (ID3), a transcriptional repressor, is crucial to promoting DSB repair and helping maintain genome stability. Here, the authors investigated ID3 regulation of DNA repair via chromatin accessibility
Giuditta Della Corte +10 more
wiley +1 more source