Results 71 to 80 of about 20,346,263 (306)

SDSS-V LVM: A Spatially Resolved Study of the Physical Conditions and the Chemical Abundance Discrepancy in the Lagoon Nebula (M 8)

The Astrophysical Journal
The abundance discrepancy problem refers to the systematic differences observed between chemical abundances derived from collisionally excited lines (CELs) and recombination lines (RLs) of heavy ions.
Amrita Singh, Guillermo A. Blanc, Nimisha Kumari, J. E. Méndez-Delgado, Sebastián F. Sánchez, Christophe Morisset, Enrico Congiu, Kathryn Kreckel, Alexandre Roman-Lopes, Oleg Egorov, Niv Drory, Ravi Sankrit, Alfredo Mejía-Narváez, Evgeniya Egorova, Amy M. Jones, Dmitry Bizyaev, Natascha Sattler, Evelyn J. Johnston, Dante Minniti, Rodolfo de J. Zermeño, José G. Fernández-Trincado, Juna A. Kollmeier   +21 more
doaj   +1 more source

THREE-DIMENSIONAL GEOMETRIES AND THE ANALYSIS OF H II REGIONS [PDF]

The Astrophysical Journal, 2013
10 pages, 4 figures, accepted for publication in ...
Wood, K., Barnes, J.E., Ercolano, B., Haffner, L.M., Reynolds, R.J., Dale, J.   +5 more
openaire   +4 more sources

Residual tail twisting in ascidian larvae is stabilized by asymmetric myofibrils that resist bilateral symmetry restoration

FEBS Letters, EarlyView.
Ascidian Ciona larvae initially show strong clockwise tail twisting, which is largely corrected during development. However, a small residual twist remains. This study shows that organized helical myofibrils in tail muscles mechanically stabilize this residual asymmetry, preventing complete restoration of bilateral symmetry and revealing how embryos ...
Yuki S. Kogure, Misaki K. Nishio, Satoru Okuda, Kohji Hotta   +3 more
wiley   +1 more source

SIGNALS of Giant H II Regions: A Spatially Resolved Analysis of NGC 604

The Astrophysical Journal
Observing giant H II regions at fine spatial scales uncovers detailed structures and reveals variations in ionization, abundance, and dynamical properties of ionized gas and the effect of stellar feedback.
Ray Garner III, Robert C. Kennicutt Jr., Laurent Drissen, Carmelle Robert, Laurie Rousseau-Nepton, Christophe Morisset, Philippe Amram, R. Pierre Martin, Emma Jarvis   +8 more
doaj   +1 more source

EMISSION LINE OBSERVATIONS OF H II REGIONS [PDF]

Symposium - International Astronomical Union, 1981
Optical observations provide a wealth of information on atomic abundances, the excitation (level of ionization), the kinetic temperature, and the density of the gas in H II regions. However, obscuration by dust limits optical observations of galactic H II regions to those which are nearby (within a few kpc) and which are unobscured by the molecular ...
openaire   +1 more source

The human gut microbiome across the life course

FEBS Letters, EarlyView.
Despite significant individual variation and continuous change throughout life, the human gut microbiome follows some life stage‐specific trends. This article provides a brief overview of how gut microbiome composition shifts across different phases of life. Created in BioRender. Özkurt, E. (2026) https://BioRender.com/8q4nrnc.
Alise J. Ponsero, Basak Bahcivanci, Antonietta Hayhoe, Animesh Acharjee, Ezgi Özkurt   +4 more
wiley   +1 more source

Spatially Resolved Galactic H ii Regions Observed by the LAMOST Medium-resolution Spectroscopic Survey of Nebulae (LAMOST MRS-N)

The Astronomical Journal
We present spatially resolved spectroscopic observations of 10 isolated Galactic H II regions using data from the LAMOST Medium-Resolution Spectroscopic Survey of Nebulae (LAMOST MRS-N).
Wei Zhang, Yunning Zhao, Lin Ma, Shiming Wen, Chaojian Wu, Juanjuan Ren, Jianjun Chen, Yuzhong Wu, Zhongrui Bai, Yonghui Hou, Yongheng Zhao, Hong Wu   +11 more
doaj   +1 more source

Degradation mechanism of the von Willebrand factor A2 domain by nattokinase

FEBS Letters, EarlyView.
Nattokinase, a natto‐derived protease, exhibits potent antithrombotic effects. This study demonstrates that nattokinase directly cleaves the von Willebrand factor (vWF) A2 domain in vitro. Unlike the native regulator ADAMTS13, nattokinase degrades folded vWF independently of shear stress.
Ryuichi Hyakumoto, Masatomo So, Ayako Furukawa, Kenji Sugase   +3 more
wiley   +1 more source

Investigating the Drivers of Electron Temperature Variations in H ii Regions with Keck-KCWI and VLT-MUSE

The Astrophysical Journal
H ii region electron temperatures are a critical ingredient in metallicity determinations, and recent observations have revealed systematic variations in the temperatures measured using different ions.
Ryan J. Rickards Vaught, Karin M. Sandstrom, Francesco Belfiore, Kathryn Kreckel, J. Eduardo Méndez-Delgado, Eric Emsellem, Brent Groves, Guillermo A. Blanc, Daniel A. Dale, Oleg V. Egorov, Simon C. O. Glover, Kathryn Grasha, Ralf S. Klessen, Justus Neumann, Thomas G. Williams   +14 more
doaj   +1 more source

RevMexAA (Serie de Conferencias), 9, 169-176 (2000)

, 2007
The designation \ultracompact H II region" rst appeared in the astronomical literature over 30 years ago. Since that time, of order 10 actual or candidate ultracompact (UC) H II regions have been identi ed, and no fewer than seven theoretical ...
S. E. Kurtz, Ultracompact Ii Regions
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