Results 71 to 80 of about 5,149 (236)

The Extremely Low Mechanical Force Generated by Nano‐Pulling Induces Global Changes in the Microtubule Network, Nuclear Morphology, and Chromatin Transcription in Neurons

Small, Volume 21, Issue 38, September 25, 2025.
Nano‐pulling induces stabilization, reorganization, and reorientation of the microtubule network. The nucleus of stretched cells experiences increased lateral tension, becomes more spherical, and develops surface grooves. At the level of gene expression regulation, changes in nuclear morphology induce global chromatin remodeling, leading to reduced ...
Alessandro Falconieri, Lorenzo Da Palmata, Valentina Cappello, Tiziana Julia Nadjeschda Schmidt, Pietro Folino, Barbara Storti, Ranieri Bizzarri, Vittoria Raffa   +7 more
wiley   +1 more source

Galaxy Merging and the Fundamental Plane of Elliptical Galaxies [PDF]

, 2006
We present preliminary results of numerical simulations of dissipationless merging of stellar systems, aimed at exploring the consequences of merging between gas free, spheroidal systems. In particular, we study the dynamical and structural characteristics of hierarchical merging between equal mass stellar systems, and we compare the properties of the ...
Carlo Nipoti, Pasquale Londrillo, Luca Ciotti   +2 more
openaire   +3 more sources

Reassessing the Relationship Between Meteor Radio Afterglows and Optical Persistent Trains

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract Meteor radio afterglows (MRAs) and optical persistent trains (PTs) are two types of long‐lived phenomena which are occasionally observed following the occurrence of a meteor. Both phenomena are thought to be produced by intrinsic emission mechanisms; PTs have been associated with chemiluminescent reactions between meteoric metals and ...
L. E. Cordonnier, K. S. Obenberger, G. B. Taylor, J. M. Holmes, J. Dowell, D. Vida   +5 more
wiley   +1 more source

Can We Discover Physical Models Using Machine Learning? A Case Study of Galaxy Sizes

The Astrophysical Journal
We explore the ability of machine learning methods to discover underlying equations of physics by searching for the equations governing galaxy size in a semianalytic model. This case study allows us to evaluate the process as we know the ground truth. We
Festa Buçinca-Çupallari, Ariyeh H. Maller, Viviana Acquaviva, Austen Gabrielpillai, Rachel S. Somerville   +4 more
doaj   +1 more source

Surface Photometry of Spiral Galaxy NGC 5005 and Elliptical Galaxy NGC 4278

مجلة بغداد للعلوم, 2018
Two galaxies have been chosen, spiral galaxy NGC 5005 and elliptical galaxy NGC 4278 to study their photometric properties by using surface photometric techniques with griz-Filters. Observations are obtained from the Sloan Digital Sky Survey (SDSS).
Baghdad Science Journal
doaj   +1 more source

Galactic Structures from Gravitational Radii

Galaxies, 2018
We demonstrate that the existence of a Noether symmetry in f ( R ) theories of gravity gives rise to an additional gravitational radius, besides the standard Schwarzschild one, determining the dynamics at galactic scales.
Salvatore Capozziello, Duško Borka, Vesna Borka Jovanović, Predrag Jovanović   +3 more
doaj   +1 more source

Dynamical Models of Elliptical Galaxies [PDF]

Symposium - International Astronomical Union, 1975
Self-consistent dynamical models of elliptical galaxies have been constructed using a modification of the Prendergast-Tomer algorithm. They reproduce many of the observed properties of elliptical galaxies.
openaire   +3 more sources

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research, Volume 6, Issue 6, June 2025.
This article uses an optical lens to emulate the gravitational lensing effect and observe the Einstein ring (ER) patterns. The symmetry‐breaking ER, i.e., Einstein cross, is observed utilizing a rotation‐symmetry‐breaking hemi‐ellipsoid lens. Deformed Einstein cross patterns induced by noncollinearly alignment of the light source–lens–observer are ...
Jun‐Liang Duan, Wen Xiao, Minyong Guo, Tong Liu, Huanyang Chen, Jin‐Hui Chen   +5 more
wiley   +1 more source

A unified linear intrinsic alignment model for elliptical and disc galaxies and the resulting ellipticity spectra

The Open Journal of Astrophysics
Alignments of disc galaxies were thought to result from tidal torquing, where tidal field of the cosmic large-scale structure exert torquing moments onto dark matter haloes, determining their angular momentum and ultimately the orientation of galactic ...
Basundhara Ghosh, Kai Nussbaumer, Eileen Sophie Giesel, Björn Malte Schäfer   +3 more
doaj   +1 more source

A Photometric Study of Giant Ellipticals and Their Stellar Halos With VST

Galaxies, 2017
Observations of diffuse starlight in the outskirts of galaxies are thought to be a fundamental source of constraints on the cosmological context of galaxy assembly in the Λ CDM model.
Marilena Spavone, Massimo Capaccioli, Nicola R. Napolitano, Enrichetta Iodice, Aniello Grado, Luca Limatola, Andrew P. Cooper, Michele Cantiello, Duncan A. Forbes, Maurizio Paolillo, Pietro Schipani   +10 more
doaj   +1 more source