Results 31 to 40 of about 2,895,298 (310)

Limits of the energy - momentum tensor in general relativity [PDF]

Classical and Quantum Gravity, 1998
A limiting diagram for the Segre classification of the energy-momentum tensor is obtained and discussed in connection with a Penrose specialization diagram for the Segre types. A generalization of the coordinate-free approach to limits of Paiva et al. to include non-vacuum space-times is made.
Paiva, F. M., Rebouças, M. J., Hall, G. S., MacCallum, M. A. H.   +3 more
openaire   +2 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

Modelling stem cell differentiation related processes—A practical overview for biologists

FEBS Letters, EarlyView.
Stem cell differentiation is complex and difficult to control experimentally. This review introduces suitable computational modelling approaches that can support stem cell research, from mechanistic ODE and abstract models to multiscale and deep learning methods.
Ricco Zeegelaar, Xinqi Yan, Lucas F. Jansen Klomp, Stefano Schivo, Janine N. Post   +4 more
wiley   +1 more source

Rotary Burnishing of Cylindrical Surfaces: Kinematic Layout, Relative Curvature Tensor, and Contact-Conformity Classification

Mathematical and Computational Applications
Rotary and vibro-rotary burnishing create regular arrays of imprints whose geometric interaction depends on the pitch, indentation depth, and relative curvature of the tool–workpiece pair. This paper develops a unified kinematic–curvature model that maps
Kirill A. Bashmur, Alexander V. Zagulyaev, Ivan S. Nekrasov   +2 more
doaj   +1 more source

Diffusion Tensor Imaging: on the assessment of data quality - a preliminary bootstrap analysis [PDF]

, 2003
In the field of nuclear magnetic resonance imaging, diffusion tensor imaging (DTI) has proven an important method for the characterisation of ultrastructural tissue properties.
Heim, Stefan, Heim, Susanne, Hahn, Klaus R., Auer, Dorothee P., Hahn, Klaus   +4 more
core   +1 more source

Paclitaxel induces NM2‐dependent cellular contraction through GEF‐H1 dissociation from microtubules and RhoA/ROCK activation in cancer cells

Molecular Oncology, EarlyView.
Taxanes are widely used chemotherapeutics whose effects on cellular mechanics remain poorly understood. We show that paclitaxel induces rapid cellular contraction by promoting GEF‐H1 dissociation from microtubules and non‐muscle myosin II activation through RhoA/ROCK.
Gloria Asensio‐Juárez, Rafael Pérez‐Díaz, Hugo Ramos‐Solano, Marina Garrido‐Casado, Vanessa C. Talayero, Miguel Vicente‐Manzanares   +5 more
wiley   +1 more source

Estimation of brain tissue response by electrical stimulation in a subject-specific model implemented by conductivity tensor imaging

Frontiers in Neuroscience, 2023
Electrical stimulation such as transcranial direct current stimulation (tDCS) is widely used to treat neuropsychiatric diseases and neurological disorders.
Nitish Katoch, Youngsung Kim, Bup Kyung Choi, Sang Woo Ha, Tae Hoon Kim, Eun Ju Yoon, Sang Gook Song, Jin Woong Kim, Hyung Joong Kim   +8 more
doaj   +1 more source

Ionomycin suppresses cancer cell growth by disrupting mitochondrial transcription

FEBS Open Bio, EarlyView.
In this study, we identify a new function for the selective Ca2+ ionophore, ionomycin, as an inhibitor of mitochondrial transcription. Both total and nascent RNA analyses revealed that ionomycin treatment reduces the transcription of mitochondrial genes.
Lishen Wang, Mingqiang Deng, Dongmei He, Diqin Lai, Dongjun Liu, Dengyong Zhu, Zhenhua Zhang, Peng Tang, Chuanman Zhou, Menghui Yin, Xichen Bao   +10 more
wiley   +1 more source

A Modified Higher-Order Singular Value Decomposition Framework With Adaptive Multilinear Tensor Rank Approximation for Three-Dimensional Magnetic Resonance Rician Noise Removal

Frontiers in Oncology, 2020
The magnetic resonance (MR) images are acknowledged to be inevitably corrupted by Rician distributed noise, which adversely affected the image quality for diagnosis purpose.
Li Wang, Di Xiao, Wen S. Hou, Wen S. Hou, Wen S. Hou, Xiao Y. Wu, Xiao Y. Wu, Xiao Y. Wu, Lin Chen, Lin Chen   +9 more
doaj   +1 more source

Using geometric algebra to represent curvature in shell theory with applications to Starling resistors [PDF]

Royal Society Open Science, 2017
We present a novel application of rotors in geometric algebra to represent the change of curvature tensor that is used in shell theory as part of the constitutive law. We introduce a new decomposition of the change of curvature tensor, which has explicit
A. L. Gregory, A. Agarwal, J. Lasenby
doaj   +1 more source