Article
Physics, Multidisciplinary
Bakhtiyor Narzilloev, Ibrar Hussain, Ahmadjon Abdujabbarov, Bobomurat Ahmedov
Summary: This work investigates the optical properties of the charged-rotating-NUT-Kiselev (CRNK) black hole in the Rastall theory of gravity. The deflection angle of photons due to gravitational lensing is found to be mostly influenced by the NUT charge, parameter of the equation of state for the quintessence, and the quintessential intensity. The rest of the spacetime parameters have negligible effects on the deflection angle. The shape and size of the black hole shadow are significantly altered by the values of the spacetime parameters, with the spin parameter having little effect. Compared to the Kerr black hole, the CRNK black hole in the Rastall gravity exhibits larger black hole shadow radius and deflection angle of photons.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
Sudhakantha Girmohanta, Yu-Cheng Qiu, Jin-Wei Wang, Tsutomu T. Yanagida
Summary: We propose a model of the quintessence axion which is based on a gauged chiral U(1) symmetry and an additional flat fifth dimension. The successful implementation of the model is ensured by the brane separation. The observed cosmological constant, the size of the extra dimension, and the axion decay constant Fa are all determined, providing stability and explaining isotropic cosmic birefringence.
Article
Astronomy & Astrophysics
Daris Samart, Bhuddhanubhap Silasan, Phongpichit Channuie
Summary: This study investigates the dynamics of interacting dark energy and dark matter in viable models of f(R) gravity using a standard framework of dynamical system analysis. The results show that in models with this interaction, the dynamical profiles of the Universe in viable f(R) dark energy models are modified by the interaction term and relevant model parameters. Additionally, the correct cosmological evolution with additional constraint parameter, alpha, from the interacting dark energy is obtained.
Article
Astronomy & Astrophysics
Shinji Tsujikawa
Summary: The study focuses on ultralight scalar particles like axions forming a Bose-Einstein condensate (BEC) state and the cosmological perturbations associated with a self-interacting BEC of a complex scalar field. The analysis highlights the differences between BECs and perfect fluids, while scrutinizing the accuracy of the commonly used Newtonian treatment based on a quasistatic approximation.
Article
Physics, Particles & Fields
Patrocinio Perez, Ulises Nucamendi, Roberto De Arcia
Summary: The study applies dynamical system theory tools to examine the structure of a non-gravitational interaction between pressureless dark matter and dark energy described by a scalar field phi. It derives a coupling function that is linearly dependent on dark matter density and the kinetic term of the scalar field, and analyzes various scenarios to understand cosmological evolution. A notable finding is the emergence of a separatrix for alpha not equal to 0, which significantly modifies the phase space structure, a novel feature not previously mentioned in the literature.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Biology
Yuji Takihara, Takumi Higaki, Tomomasa Yokomizo, Terumasa Umemoto, Kazunori Ariyoshi, Michihiro Hashimoto, Maiko Sezaki, Hitoshi Takizawa, Toshihiro Inoue, Toshio Suda, Hidenobu Mizuno
Summary: This study developed an intravital imaging method to observe the migration dynamics of hematopoietic stem cells (HSCs) during bone marrow formation. Neonatal HSCs migrate from outside to inside the tibia via the blood vessels that penetrate the bone, and settle on the blood vessel wall in the bone marrow.
COMMUNICATIONS BIOLOGY
(2022)
Article
Astronomy & Astrophysics
V. C. Tavares, C. J. A. P. Martins
Summary: The study concludes that the potential in these models needs to be extremely flat, and the dark energy equation of state deviates within 95.4% confidence levels for the rolling tachyon and Chaplygin components.
Article
Biochemistry & Molecular Biology
Karin Ortmayr, Mattia Zampieri
Summary: By studying the metabolic characteristics of quiescent cancer cells, we can uncover the mechanism of cell transition between proliferation and quiescence. Inhibiting mitochondrial fatty acid beta-oxidation can induce apoptosis in quiescent cancer cells and hinder their return to proliferation. Understanding the metabolic strategies for entering, maintaining, and exiting quiescence is important for understanding cell plasticity.
MOLECULAR SYSTEMS BIOLOGY
(2022)
Article
Cell Biology
Flavie Gautheron, Aleksandra Georgievski, Carmen Garrido, Ronan Quere
Summary: Extracellular vesicles (EVs) released by cells in the bone marrow (BM) play an important role in regulating hematopoietic stem cells (HSC) through the transport of bioactive phosphorylated Smad2 (p-Smad2). We found that the EV inhibitor Calpeptin significantly affected the production of p-Smad2-carrying EVs in mouse BM, leading to alterations in HSC quiescence and maintenance. Our study also revealed that p-Smad2 is necessary for the ex vivo maintenance of HSC, as EVs lacking p-Smad2 failed to support HSC survival.
CELL DEATH DISCOVERY
(2023)
Article
Physics, Multidisciplinary
Xiang-Qian Li, Bo Chen, Li-Li Xing
Summary: In this study, we investigated black hole solutions in the presence of modified Chaplygin gas as a cosmic background, and found that the spacetime structure could be either asymptotically anti-de Sitter or de Sitter. For asymptotically anti-de Sitter black hole, we observed small/large black hole phase transition, while for asymptotically de Sitter black hole, there was no criticality or phase transition.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Plant Sciences
Michael J. Considine, Christine H. Foyer
Summary: Quiescence is an important survival mechanism in cells, where cell division is temporarily repressed. Recent studies have shown that quiescence is an actively monitored process influenced by environmental stimuli, contrary to its previous perception as an inactive state. This article provides a perspective on the quiescent state and discusses the regulation of this process by energy, nutrient and oxygen status, as well as the pathways involved in sensing and transmitting these signals. It highlights the role of canonical regulators, signaling mechanisms, mitochondrial functions, and reactive oxygen species in the orchestration of quiescence.
Article
Cell Biology
Bertrand Daignan-Fornier, Damien Laporte, Isabelle Sagot
Summary: The ability to reproduce and survive is crucial for all forms of life. In the evolution process, organisms develop specific adaptation strategies such as quiescence. Through the formation of a microenvironment by neighboring cells, quiescence may enable cell differentiation and specialization.
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
(2021)
Article
Astronomy & Astrophysics
Gongjun Choi, Weikang Lin, Luca Visinelli, Tsutomu T. Yanagida
Summary: Using the reported non-zero rotation angle of the cosmic microwave background (CMB) linear polarization as a hint, a new model for quintessence dark energy is proposed and speculated based on experimental results, aiming to predict the equation of state of dark energy and distinguish it from the cosmological constant for future testing.
Article
Multidisciplinary Sciences
Cosmin Andrei, Anna Ijjas, Paul J. Steinhardt
Summary: In this paper, we investigate how short the remaining period of expansion can be given current observational constraints on dark energy, and discuss how this scenario fits naturally with cyclic cosmologies and recent conjectures about quantum gravity.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Chao Wang, Ruben Rabadan Ros, Paloma Martinez-Redondo, Zaijun Ma, Lei Shi, Yuan Xue, Isabel Guillen-Guillen, Ling Huang, Tomoaki Hishida, Hsin-Kai Liao, Estrella Nunez Delicado, Concepcion Rodriguez Esteban, Pedro Guillen-Garcia, Pradeep Reddy, Juan Carlos Izpisua Belmonte
Summary: Short-term systemic expression of reprogramming factors Oct-3/4, Sox2, Klf4, c-Myc (OSKM) rejuvenates aging cells and promotes tissue regeneration. Myofiber-specific expression of OSKM accelerates muscle regeneration by reducing secretion of muscle stem cell quiescence promoting Wnt4.
NATURE COMMUNICATIONS
(2021)