Results 101 to 110 of about 8,064,980 (248)

JWST and Gemini Observations of the Active Centaur 450P/LONEOS: Nucleus and Coma Characterizations

The Planetary Science Journal
Between 2019 and 2024, we used the Gemini-N and JWST observatories to conduct a detailed case study of the active Centaur 450P/LONEOS, whose orbit was significantly altered by a close Saturn encounter in 1992.
Charles A. Schambeau, Michael S. P. Kelley, Maria Womack, Eva Lilly, Theodore Kareta, Sara Faggi, Olga Harrington Pinto, Marco Micheli, Dominique Bockelée-Morvan, Yanga R. Fernández, Adam McKay, Noemi Pinilla-Alonso, Javier Licandro, Aren Beck, Geronimo L. Villanueva, James Bauer, Lori Feaga, Michael A. DiSanti, Kacper Wierzchos   +18 more
doaj   +1 more source

A new activity index for comets [PDF]

, 1991
An activity index, AI, is derived from observational data to measure the increase of activity in magnitudes for comets when brightest near perihelion as compared to their inactive reflective brightness at great solar distances.
Whipple, Fred L.
core  

Simulating observable comets

, 2002
This is the first of a series of papers presenting an attempt to reproduce the mechanisms acting currently on the Oort cloud of comets and producing the observed long-period comets.
P. A. Dybczyński
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

A description of dental microanatomy and implantation geometry in Chamaeleonidae

Journal of Anatomy, EarlyView.
A reassessment of the dental histology in adult chamaeleons reveals the presence of periodontal ligament. Alongside alveolar bone and cementum, these tissues together constitute a compacted and remodelled tripartite periodontium. Our findings include the novel observation of plicidentine‐like protuberances of dentine within underlying bone.
Giles D. Sukkert, Ilaria Paparella, Michael R. Doschak, Aaron R. H. LeBlanc, Michael W. Caldwell   +4 more
wiley   +1 more source

The investigation of precision by Everhart method of orbital evolution of the asteroids Apollo, Amur, Aten groups and short-period comets

Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2008
: Investigation of evolution of the orbits 190 asteroids having closely approach with Earth is carried. The results of calculations with other investigators are compared.
A. A. Zausaev, A. F. Zausaev
doaj   +1 more source

Reconstructing the major skull myology of the giant stem‐amphibian Mastodonsaurus: A case study for early tetrapods

Journal of Anatomy, EarlyView.
We reconstruct the major cranial musculature of the giant stem amphibian Mastodonsaurus giganteus, revealing a differentiated jaw‐adductor system, a probable sesamoid pulley, and previously unrecognised muscles. This EPB‐based case study establishes an anatomical framework for modelling feeding in early tetrapods and supports interpretations of ...
Daniel Schwarz, Stephan Lautenschlager, Florian Witzmann, Raphael Moreno, Eudald Mujal, Rainer R. Schoch   +5 more
wiley   +1 more source

Dust Production Rates in Jupiter-family Comets: A Two Year Study with ATLAS Photometry

The Planetary Science Journal
Jupiter-family comets (JFCs) exhibit a wide range of activity levels and mass loss over their orbits. We analyzed high-cadence observations of 42 active JFCs with the wide-field Asteroid Terrestrial-impact Last Alert System (ATLAS) in 2020–
A. Fraser Gillan, Alan Fitzsimmons, Larry Denneau, Robert J. Siverd, Ken W. Smith, John L. Tonry, David R. Young   +6 more
doaj   +1 more source

Profile of Neonates Admitted With Hypoxic‐Ischemic Encephalopathy and Early Neurodevelopment Outcomes: A Retrospective Cohort Study

Journal of Paediatrics and Child Health, EarlyView.
ABSTRACT Objective To evaluate contemporary clinical profiles and early neurodevelopmental outcomes of neonates admitted with hypoxic–ischemic encephalopathy (HIE) in an Australian tertiary perinatal unit. Study Design A retrospective cohort study (2019–2025) of neonates born ≥ 35 weeks' gestation admitted with a diagnosis of HIE.
Visothpong Chhoam, Nicole Ng, Abdul Razak, Vathana Sackett, Annie Bourke, Pramod Pharande, Rod W. Hunt, Lindsay Zhou, Atul Malhotra   +8 more
wiley   +1 more source

Enhancing or Transcending the Pipeline? How Incumbents Transition Toward Marketplace Platforms

Journal of Product Innovation Management, EarlyView.
ABSTRACT Business‐to‐business incumbents whose value creation rests on pipeline business models increasingly launch their own marketplace platforms. Yet how these business model transitions toward marketplace platforms unfold, and what they imply for the pipeline model, remains poorly understood.
Alexander Engelmann, Georg Reischauer, Annabelle Gawer   +2 more
wiley   +1 more source