Results 51 to 60 of about 549,270 (251)

Six Outbursts of Comet 46P/Wirtanen

The Planetary Science Journal, 2021
Cometary activity is a manifestation of sublimation-driven processes at the surface of nuclei. However, cometary outbursts may arise from other processes that are not necessarily driven by volatiles.
Michael S. P. Kelley, Tony L. Farnham, Jian-Yang Li, Dennis Bodewits, Colin Snodgrass, Johannes Allen, —, Eric C. Bellm, Michael W. Coughlin, Andrew J. Drake, Dmitry A. Duev, Matthew J. Graham, Thomas Kupfer, Frank J. Masci, Dan Reiley, Richard Walters, Zwicky Transient Facility Collaboration, M. Dominik, U. G. Jørgensen, A. E. Andrews, N. Bach-Møller, V. Bozza, M. J. Burgdorf, J. Campbell-White, S. Dib, Y. I. Fujii, T. C. Hinse, M. Hundertmark, E. Khalouei, P. Longa-Peña, M. Rabus, S. Rahvar, S. Sajadian, J. Skottfelt, J. Southworth, J. Tregloan-Reed, E. Unda-Sanzana, MiNDSTEp Collaboration   +37 more
doaj   +1 more source

The Composition of Dust in Jupiter-Family Comets as Inferred from Infrared Spectroscopy

, 2008
We review the composition of Jupiter-family comet dust as inferred from infrared spectroscopy. We find that Jupiter-family comets have 10 micron silicate emission features with fluxes roughly 20-25% over the dust continuum (emission strength 1.20-1.25 ...
Kelley, Michael S., Wooden, Diane H.
core   +1 more source

Early neuronal accumulation of DNA double strand breaks in Alzheimer's disease. [PDF]

, 2019
The maintenance of genomic integrity is essential for normal cellular functions. However, it is difficult to maintain over a lifetime in postmitotic cells such as neurons, in which DNA damage increases with age and is exacerbated by multiple neurological
Adame, Anthony, Evans, Mark D, Mao, Wenjie, Masliah, Eliezer, Mucke, Lennart, Nana, Alissa L, Rissman, Robert A, Seeley, William W, Shanbhag, Niraj M   +8 more
core   +2 more sources

Light‐Switched Mesenchymal Stem Cells for In Situ Exosome Amplification in Craniofacial Bone Defect Reconstruction

Advanced Science, EarlyView.
Light‐switchable MSCs (MSC‐UCNPs) were constructed by intracellular incorporation of UCNPs. Upon 980 nm irradiation, UCNPs emitted localized ultraviolet light (365 nm), activating the ROS/HEXB/LAMP1 signaling pathway to suppress lysosome–multivesicular body fusion and thereby enhance exosome biogenesis. Embedded within an injectable hydrogel, MSC‐UCNPs
Tingting Wu, Yajing Liu, Shuman Wang, Xiaoming Bai, Luyun Zhang, Yuwei Liu, Zhiwen Fu, Chen Shi   +7 more
wiley   +1 more source

Local manifestations of cometary activity [PDF]

, 2019
Comets are made of volatile and refractory material and naturally experience various degrees of sublimation as they orbit around the Sun. This gas release, accompanied by dust, represents what is traditionally described as activity.
El-Maarry, Ramy, Farnham, Tony, Keller, Horst Uwe, Kührt, Ekkehard, Marschall, Raphael, Oklay, Nilda, Skorov, Yuri, Vincent, Jean-Baptiste   +7 more
core   +2 more sources

Hepatotoxicity of Nonesterified Fatty Acids to Dairy Cows: Pathophysiological Mechanisms and Prospective Solutions

Animal Research and One Health, EarlyView.
Unregulated inflammation increases non‐esterified fatty acids (NEFAs), and triggers multi‐pathway hepatocyte damage including oxidative stress, mitochondrial dysfunction, and metabolic disorders in dairy cows. ABSTRACT Circulating concentrations of nonesterified fatty acids (NEFAs) are elevated due to lipid mobilization from adipose tissue in ...
Siqing Mao, Yuan Tian, Dan Li, Lei Tian, Hang Yu, Ziling Liu, Xin Gao, Yanqiong Wen, Fachun Wan, Zuo Wang, Weijun Shen, Xinwei Li, Lei Liu   +12 more
wiley   +1 more source

Evaluation of genotoxic activity of maleic hydrazide, ethyl methane sulfonate, and N-nitroso diethylamine in Tradescantia

Salud Pública de México, 2001
Objective. To assess the genotoxic activity of N-nitroso diethylamine (NDEA), maleic hydrazide (MH), and ethyl methane sulfonate (EMS) using two systems: the comet assay on nuclei from Tradescantia, and the pink mutation test on Tradescantia staminal ...
Alvarez-Moya Carlos, Santerre-Lucas Anne, Zúñiga-González Guillermo, Torres-Bugarín Olivia, Padilla-Camberos Eduardo, Feria-Velasco Alfredo   +5 more
doaj  

Comet Nuclei Composition and Evolution

Thanks to Rosetta orbiter's and Philae lander's data our knowledge of cometary nuclei composition has experienced a great advancement. The properties of 67P/CG nucleus are discussed and compared with other comets explored in the past by space missions.
Filacchione, Gianrico, Ciarniello, Mauro, Fornasier, Sonia, Raponi, Andrea   +3 more
openaire   +2 more sources

Visualizing Specific Tubulin Isotypes and Pathogenic Variants in Cellular Microtubule Arrays

Cytoskeleton, EarlyView.
ABSTRACT Eukaryotic cells depend on dynamic microtubule arrays to execute a wide range of functions vital for life. These microtubule filaments are formed through the polymerization of α/β‐tubulin proteins, which can be generated from numerous tubulin genes, or isotypes.
Sareen Fiaz, Benjamin Powers, Jayne Aiken   +2 more
wiley   +1 more source

Hubble Space Telescope Observations of the Interstellar Interloper 3I/ATLAS

The Astrophysical Journal Letters
We present high-angular-resolution observations of the third known interstellar interloper, 3I/ATLAS, from the Hubble Space Telescope. The object is clearly active at 3.8 au preperihelion, showing dust emitted from the hot, Sun-facing side of the nucleus
David Jewitt, Man-To Hui, Max Mutchler, Yoonyoung Kim, Jessica Agarwal   +4 more
doaj   +1 more source