Results 111 to 120 of about 136,231 (311)

Photometrıc Observatıons of Symbıotıc Star AG PEG

East European Journal of Physics
In the article, using the AAVSO (American Association of Variable Star Observers) photometric database of the AG Pegasi symbiotic star, a light curve was constructed in the Vis filter for a period of 68 (1954-2022) years.
Kh.M. Mikailov, R.T. Mammadov, A.B. Rustamova, L.R. Mammadova   +3 more
doaj   +1 more source

Towards an Understanding of the Of?p star HD 191612: Optical Spectroscopy [PDF]

, 2008
We have acquired extensive optical spectroscopy of the early-type magnetic star HD 191612 (O6.5f?pe-O8fp). The Balmer and HeI lines show strongly variable emission which is extremely reproducible on a well-determined 538-d period.
Lennon, D. J., Nazé, Yaël, Howarth, I. D., Walborn, N. R., Puls, J.   +4 more
core  

Biophysical approaches for studying viral entry

FEBS Letters, EarlyView.
Viruses infect all living organisms and have been responsible for major epidemics and pandemics. Their ongoing evolutionary battle with host defenses creates a constant need for improved tools to study viral behavior. Advancing methods to probe viral attachment, fusion, and genome release deepen our understanding of how infections begin and support the
Inbar Yosibash, Raya Sorkin
wiley   +1 more source

Hα Variability of AB Aur b with the Hubble Space Telescope: Probing the Nature of a Protoplanet Candidate with Accretion Light Echoes

The Astronomical Journal
Giant planets generate accretion luminosity as they form. Much of this energy is radiated in strong H α line emission, which has motivated direct imaging surveys at optical wavelengths to search for accreting protoplanets.
Brendan P. Bowler, Yifan Zhou, Lauren I. Biddle, Lillian Yushu Jiang, Jaehan Bae, Laird M. Close, Katherine B. Follette, Kyle Franson, Adam L. Kraus, Aniket Sanghi, Quang Tran, Kimberly Ward-Duong, Ya-Lin Wu, Zhaohuan Zhu   +13 more
doaj   +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

FQ Circini: An Ordinary Nova with a High-mass B1 V(n)(e) Companion Whose Decretion Disk Transfers Mass to the White Dwarf via Roche–Lobe Overflow

The Astrophysical Journal
FQ Cir was an ordinary fast He/N classical nova, peaking at V = 10.9. The pre-eruption and post-eruption counterpart was at V = 14.0, making this the smallest known classical nova amplitude, 3.1 mag.
Bradley E. Schaefer, Andrew Pearce, Tom Love, Michael M. Shara, Lee Townsend, Simon J. Murphy, Christopher J. Corbally   +6 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

Classification of Periodic Variable Stars from TESS

The Astrophysical Journal Supplement Series
The number of known periodic variable stars has increased rapidly in recent years. As an all-sky transit survey, the Transiting Exoplanet Survey Satellite (TESS) plays an important role in detecting low-amplitude variable stars.
Xinyi Gao, Xiaodian Chen, Shu Wang, Jifeng Liu   +3 more
doaj   +1 more source

Variable Star Astronomy Education & Public Outreach Initiative

, 2008
The American Association of Variable Star Observers (AAVSO) published a comprehensive variable star curriculum, “Hands-On Astrophysics, Variable Stars in Science, Math, and Computer Education” in 1997.
Young, Donna L.
core  

CCD polarimetry as a probe of regions of recent star-formation [PDF]

, 1988
Chapter 1 of this thesis details the incorporation of a Charged Coupled Device (CCD) detector system with the Durham Imaging Polarimeter. The details include the physical characteristics of the device and the electronics and software associated with the ...
Draper, P, Draper, P.W, Draper, Peter Walter   +2 more
core