Results 41 to 50 of about 91,815 (175)

Halogens at Comet 67P/Churyumov-Gerasimenko observed by ROSINA-DFMS

, 2016
International audienceSince August 2014, the Rosetta spacecraft has been studying the coma of comet 67P/Churyumov-Gerasimenko. The Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) sensor DFMS is a double focussing mass spectrometer with
Combi, Michael R., Mall, Urs, Fuselier, Stephen, Briois, Christelle, Gibbons, Andrew, Neefs, Eddy, Calmonte, Ursina, Gunell, Herbert, Dhooghe, Frederik, de Keyser, Johan, Cessateur, Gaël, Hässig, Myrtha, Gombosi, Tamas, Marty, Bernard, Le Roy, Léna, Maggiolo, Romain, Rubin, Martin, Berthelier, Jean-Jacques, Fiethe, Björn, Altwegg, Kathrin, Equeter, Eddy   +20 more
core   +4 more sources

Observations of [O I] Emission in Comets C/2014 Q2 (Lovejoy) and C/2007 N3 (Lulin): Possible Influence of Solar Activity on Oxygen Line Ratios

The Planetary Science Journal
Observing [O i ] emission to calculate an oxygen line ratio has been proposed as a potential proxy for direct CO _2 measurement in comets. However, the photochemistry governing [O i ] release into the coma is not well understood, and using theoretical ...
Ella J. Mayfield, Adam J. McKay, Michael S. P. Kelley, Anita L. Cochran   +3 more
doaj   +1 more source

Citric‐Acid Polyester‐Modified Melamine–Formaldehyde Resins: Mechanistic Insights and Implications for Greener Decorative Laminates

Journal of Applied Polymer Science, Volume 143, Issue 40, October 20, 2026.
Driven by the need for more sustainable materials in the laminate industry, poly(glycerol citrate) was introduced as a bio‐based modifier that significantly altered the cure kinetics and structural evolution of melamine–formaldehyde resins. Correlated FTIR, DSC, TGA, and rheological analyses revealed accelerated network formation, enabling lower ...
Martina Duller, Arunjunai Raj Mahendran, Elisabeth Billich, Edith Martha Zikulnig‐Rusch   +3 more
wiley   +1 more source

Linear Viscoelastic Behavior of n‐Alkane Diluted Polyethylene Melts: Sorption, Desorption, and Oscillatory Rheometry

Journal of Applied Polymer Science, Volume 143, Issue 39, October 15, 2026.
This study systematically maps polyolefin dilution dynamics using a homologous series of n‐alkanes. Integrating gravimetric sorption, subsequent controlled desorption, and oscillatory rheometry establishes a precise framework to analyze reduction in viscosity at least for polymer diluent mixtures with polymer concentration > 35% and diluent ...
Ernst Georg Viehböck, Georg Gschwendner, Dario Pindrić, Gunnar Spiegel, Alexander Hammer, Christian Paulik, Gerald Berger‐Weber   +6 more
wiley   +1 more source

First comet observations with NIRSPEC-2 at Keck : outgassing sources of parent volatiles and abundances based on alternative taxonomic compositional baselines in 46P/Wirtanen

, 2021
A major upgrade to the NIRSPEC instrument at the Keck II telescope was successfully completed in time for near-infrared spectroscopic observations of comet 46P/Wirtanen during its exceptionally close flyby of Earth in 2018 December.
Michael A. DiSanti (16783662), Nicolas Biver (16786092), Boncho Bonev (14621714), Erika L. Gibb (16783653), Martin A. Cordiner (16786338), Jacques Crovisier (16786362), Ronald J. Vervack, Jr. (16783650), Nathan X. Roth (16783659), Emily C. Martin (16786380), Dennis Bodewits (16786386), Gregory Doppmann (16786383), Michael R. Combi (16786101), Adam McKay (14621483), Geronimo L. Villanueva (16782987), Mohammad Saki (3127134), Yinsi Shou (7356752), Younas Khan (16786335), Kumar Venkataramani (16786389), Neil Dello Russo (16783644), Anita L. Cochran (16786098), Hideyo Kawakita (16783647)   +20 more
core   +2 more sources

Boulder Migration in the Khonsu Region of Comet 67P/Churyumov–Gerasimenko

The Astrophysical Journal
The European Space Agency's Rosetta mission is the only space mission that has performed long-term monitoring of a comet at close distances. For over two years, Rosetta rendezvoused with comet 67P/Churyumov–Gerasimenko, which revealed diverse ...
Xiang Tang, Xian Shi, Mohamed Ramy El-Maarry   +2 more
doaj   +1 more source

Programming Gut Microbiome Function Through Cross‐Feeding: From Ecological Mechanisms to Live Biotherapeutics

Advanced Science, Volume 13, Issue 55, 5 October 2026.
This graphical abstract presents gut microbial cross‐feeding through a Mechanism–Technology–Application framework. It summarizes major resource‐transfer modes, the experimental and computational tools used to establish causality, and potential interventions involving dietary substrates, live biotherapeutic products, and engineered microbes.
Chuankai Sun, Teng Ma, Hao Jin, Zelong Li, Yi Cheng, Jingjin Li, Lai‐Yu Kwok, Zhihong Sun   +7 more
wiley   +1 more source

Diurnal Ejection of Boulder Clusters on Comet 67P Lasting beyond 3 au

The Astrophysical Journal Letters
Ejection of large boulder-like debris is a vigorous form of cometary activity that is unlikely induced by water ice out-gassing alone but rather associated with the sublimation of super-volatile ices.
Xian Shi, Xuanyu Hu, Jessica Agarwal, Carsten Güttler, Martin Rose, Horst Uwe Keller, Marco Fulle, Jakob Deller, Holger Sierks   +8 more
doaj   +1 more source

Traditional Uses, Phytochemistry, and Multi‐Target Pharmacological Activities of Senna alexandrina

Chemistry &Biodiversity, Volume 23, Issue 10, October 2026.
Senna alexandrina is a medicinally important plant with documented use across Traditional Chinese, Islamic, Ayurvedic, and Unani medicine systems. Phytochemical investigations have yielded 219 characterized compounds, predominantly anthraquinones, flavonoids, and polysaccharides, distributed across leaves, pods, and aerial parts.
Diana Afrina Rella, Khai‐Lin Hew, Yeun‐Mun Choo   +2 more
wiley   +1 more source

Postperihelion Coma Composition of the Interstellar Comet 3I/ATLAS from Optical Spectroscopy

The Astrophysical Journal Letters
We present multiepoch optical spectroscopy of the interstellar comet 3I/ATLAS obtained between 2025 December and 2026 January (heliocentric distances of 1.8–3.3 au), yielding postperihelion production rates and mixing ratios for CN, C _3 , C _2 , CH, and
Ruining Zhao, Xiliang Zhang, Bin Yang, Xiangyu Fan, Shu Wang, Yang Huang, Jifeng Liu   +6 more
doaj   +1 more source