Results 71 to 80 of about 329,629 (202)

Multiple Outbursts of Halley-type Comet 12P/Pons–Brooks

The Astronomical Journal
We present optical observations of the Halley-type comet 12P/Pons–Brooks (12P) on its approach to perihelion. The comet was active even in the first observations at ∼8 au.
David Jewitt, Jane Luu
doaj   +1 more source

Genotoxicity of nitroso compounds and sodium dichromate in a model combining organ cultures of human nasal epithelia and the comet assay [PDF]

, 2001
Genotoxic effects of xenobiotics are a possible step in tumor initiation in the mucosa of the upper aerodigestive tract. Using the comet assay, detecting genotoxicity in human tissue has been restricted to single incubations in vitro, but in vivo most ...
Bergner, Albrecht, Kastenbauer, Ernst R., Gamarra, Fernando, Kleinsasser, Norbert H., Harréus, Ulrich A., Huber, Rudolf M., Wallner, Barbara C., Juchhoff, Jutta   +7 more
core   +1 more source

Compromised DNA replication in gut cells underlies sensitivity to genotoxic stress in the tardigrade Hypsibius exemplaris

The FEBS Journal, EarlyView.
DNA damage in the tardigrade Hypsibius exemplaris elicits distinct cellular outcomes depending on replication status. While non‐replicating cells tolerate genotoxic stress, constitutively replicating cells undergo irreversible replication failure upon DNA damage, leading to loss of tissue homeostasis, fat depletion, sterility, and organismal death ...
Gonzalo Quiroga‐Artigas, Pauline Fontanié, Benjamin Lacroix, Maria Dolores Molina, María Moriel‐Carretero   +4 more
wiley   +1 more source

Spin-dependent μ→e conversion

Physics Letters B, 2017
The experimental sensitivity to μ→e conversion on nuclei is expected to improve by four orders of magnitude in coming years. We consider the impact of μ→e flavour-changing tensor and axial-vector four-fermion operators which couple to the spin of ...
Vincenzo Cirigliano, Sacha Davidson, Yoshitaka Kuno   +2 more
doaj   +1 more source

3SD: Rotational symmetry single‐shot denoising in fluorescence microscopy

Journal of Microscopy, EarlyView.
Abstract Image noise is a fundamental problem in fluorescence microscopy analysis, especially in live cell imaging applications where the number of detected photons is limited due to low power of excitation lasers to prevent phototoxicity during extended imaging experiments.
Tijmen H. de Wolf, Pleun Engbers, Justine Perrin, Julie Nonnekens, Ihor Smal   +4 more
wiley   +1 more source

Syrinx anatomy and vocalizations in New World vultures (Aves: Cathartidae): Implications for avian vocal evolution

Journal of Anatomy, EarlyView.
New World vultures are the only avian clade proposed to lack a syrinx and have been described as non‐vocal. Using dissection, diceCT, and histology, we demonstrate that cathartid vultures have novel syringeal features that form a syrinx and vocal characterization reveals that they produce more complex vocalizations than previously reported.
Bradley A. Ibarra, Carmen A. Urban, Lucas J. Legendre, Julia A. Clarke   +3 more
wiley   +1 more source

Contemporaneous Optical and Near-infrared Observations of the Interstellar Comet 3I/ATLAS Pre- and Postperihelion

The Astronomical Journal
Interstellar objects provide a unique view into the formation of other star systems. Here we present spectroscopic observations of the recently discovered interstellar object 3I/ATLAS between a heliocentric distance of 3.7–1.8 au on either side of its ...
Kyle Medler, Willem B. Hoogendam, Christopher Ashall, Bin Yang, James J. Wray, Benjamin J. Shappee, Karen J. Meech, Michael A. Tucker, Katie Auchettl, Dhvanil D. Desai, Jason T. Hinkle, Andrew M. Hoffman, Mark E. Huber, David O. Jones, Ruining Zhao   +14 more
doaj   +1 more source

DNA damage induced by mutagens in plant and human cell nuclei in acellular comet assay.

Folia Histochemica et Cytobiologica, 2006
Higher plant cells have a long tradition of use in the studies on environmental mutagenesis in situ, especially in relation to human health risk determination.
Jolanta Maluszynska, Agnieszka Gnys, Jolanta Juchimiuk   +2 more
doaj   +1 more source

Observational constraints on surface characteristics of comet nuclei

, 2002
Direct observations of the nuclear surfaces of comets have been difficult; however a growing number of studies are overcoming observational challenges and yielding new information on cometary surfaces. In this review, we focus on recent determinations of

core  

A search for a muon to electron conversion in COMET

, 2023
The COMET experiment at J-PARC, Japan, aims to search for muon to electron conversion with aluminium nuclei, achieving a sensitivity four orders of magnitude higher than the current upper limit at a 90% confidence level. The proton beam line has recently
Fujii, Yuki
core