Results 71 to 80 of about 15,412 (318)

Resolving asymmetries along the pulsation cycle of the Mira star X Hya

, 2015
The mass-loss process in Mira stars probably occurs in an asymmetric way where dust can form in inhomogeneous circumstellar molecular clumps. Following asymmetries along the pulsation cycle can give us clues about these mass-loss processes. We imaged the
Haubois, X., Ireland, M., Kervella, P., Mérand, A., Perrin, G., Ridgway, S. T., Scholz, M., Thiébaut, E., Wittkowski, M.   +8 more
core   +1 more source

Antibiofilm activity of a chionodracine‐derived peptide by NMR‐based metabolomics of cell‐free supernatant of Acinetobacter baumannii clinical strains

FEBS Open Bio, EarlyView.
KHS‐Cnd peptide is able to impair biofilm formation and disaggregate mature biofilms in Acinetobacter baumannii clinical isolates. Differences in extracellular metabolites reflect changes in biofilm metabolism due to KHS‐Cnd treatment. Among the differentially represented extracellular metabolites upon KHS‐Cnd treatment, the significantly altered ...
Fernando Porcelli, Enrico Landi, Francesco Maiurano, Irene Paris, Rosanna Papa, Marco Artini, Laura Selan, Stefano Borocci, Francesco Buonocore, Esther Imperlini   +9 more
wiley   +1 more source

Self-excited Pulsations and the Instability Strip of Long-period Variables: The Transition from Small-amplitude Red Giants to Semi-regular Variables

The Astrophysical Journal
We use one-dimensional hydrodynamic calculations combined with synthetic stellar population models of the Magellanic Clouds to study the onset of self-excited pulsation in luminous red giants.
Michele Trabucchi, Giada Pastorelli
doaj   +1 more source

Asteroseismic modelling of the Binary HD 176465

EPJ Web of Conferences, 2017
The detection and analysis of oscillations in binary star systems is critical in understanding stellar structure and evolution. This is partly because such systems have the same initial chemical composition and age.
Nsamba B., Monteiro M. J. P. F. G., Campante T. L., Reese D. R., White T. R., García Hernández A., Jiang C.   +6 more
doaj   +1 more source

Multimode stellar pulsations. III - Resonances

The Astrophysical Journal, 1982
We include the treatment of resonances in the formalism of multitime asymptotic techniques previously devised to treat stellar pulsation (monomode and multimode) with a slow evolution in the absence of resonances. The evolution can be followed toward and through a resonance, and the effects of resonances can be investigated.
O. Regev, J. R. Buchler, M. Barranco
openaire   +1 more source

Polarization‐resolved femtosecond Vis/IR spectroscopy tailored for resolving weak signals in biological samples using minimal sample volume

FEBS Open Bio, EarlyView.
Unique biological samples, such as site‐specific mutant proteins, are available only in limited quantities. Here, we present a polarization‐resolved transient infrared spectroscopy setup with referencing to improve signal‐to‐noise tailored towards tracing small signals. We provide an overview of characterizing the excitation conditions for polarization‐
Clark Zahn, Karsten Heyne
wiley   +1 more source

Calibration of the convective parameters in stellar pulsation hydrocodes [PDF]

, 2023
Gábor B. Kovács, J. Nuspl, R. Szabó
openalex   +3 more sources

Nuclear pore links Fob1‐dependent rDNA damage relocation to lifespan control

FEBS Open Bio, EarlyView.
Damaged rDNA accumulates at a specific perinuclear interface that couples nucleolar escape with nuclear envelope association. Nuclear pores at this site help inhibit Fob1‐induced rDNA instability. This spatial organization of damage handling supports a functional link between nuclear architecture, rDNA stability, and replicative lifespan in yeast.
Yamato Okada, Mina Iwaki, Kyosuke Hagiri, Rei Izumi, Masahiko Harata, Chihiro Horigome   +5 more
wiley   +1 more source

Multiepoch Optical Spectroscopy of the Post-AGB Star HD 161796

The Astrophysical Journal, 2022
The evolutionary rate of the pulsating post–asymptotic giant branch (post-AGB) star HD 161796 was suspected to be high. Spectra of HD 161796 acquired during a time span of 18 yr are analyzed with the main goal of determining the evolutionary increase in ...
Kārlis Puķītis, Laimons Začs, Aija Grankina   +2 more
doaj   +1 more source

Automated Nonlinear Stellar Pulsation Calculations: Applications to RR Lyrae stars. The Slope of the Fundamental Blue Edge and the First RRd Model Survey

, 2004
We describe a methodology that allows us to follow the pulsational behavior of an RR Lyrae model consistently and automatically along its evolutionary track throughout the whole instability strip. It is based on the powerful amplitude equation formalism,
Alibert, Beaulieu, Bono, Bono, Bono, Bragaglia, Buchler, Buchler, Buchler, Buchler, Buchler, Castellani, Catelan, Clement, Clementini, Cseresnjes, Demarque, Dorfi, Dorman, Feuchtinger, Gallart, Girardi, Gábor, J. R. Buchler, Jurcsik, Jurcsik, Kolláth, Kolláth, Kolláth, Kolláth, Kovács, Kovács, Kovács, Kovács, Kovács, Lee, Mizerski, Popielski, R. Szabó, Schaller, Soszynski, Soszynski, Szabó, Udalski, van Albada, Walker, Yecko, Z. Kolláth   +47 more
core   +1 more source