Results 81 to 90 of about 263,310 (323)

Discrete Symmetries Underlying Some Continuous Ones: Two Examples From Gravity And Particle Physics [PDF]

open access: yes, 2002
Two examples, not connected at present, from author's papers (Nuovo Cim., 1992, v.105A, p.77 [hep-th/0207210] and GRG, 1999, v.31, p.1431 [gr-qc/0207017]) are considered here in which a physical model has discrete symmetries and additional non-observable
Ivanov, Michael A.
core   +1 more source

Uniformly expanding vacuum: a possible interpretation of the dark energy

open access: yes, 2016
Following the spirit of the equivalence principle, we take a step further to recognize the free fall of the observer as a method to eliminate causes that would lead the perceived vacuum to change its original state.
Huang, Peng, Yuan, Fang-Fang
core   +1 more source

Observer study-based evaluation of a stochastic and physics-based method to generate oncological PET images [PDF]

open access: green, 2021
Ziping Liu   +7 more
openalex   +1 more source

The role of histone modifications in transcription regulation upon DNA damage

open access: yesFEBS Letters, EarlyView.
This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley   +1 more source

Mechanisms of parasite‐mediated disruption of brain vessels

open access: yesFEBS Letters, EarlyView.
Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira   +3 more
wiley   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

open access: yesFEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo   +2 more
wiley   +1 more source

Initial states and infrared physics in locally de Sitter spacetime

open access: yes, 2012
The long wavelength physics in a de Sitter region depends on the initial quantum state. While such long wavelength physics is under control for massive fields near the Hartle-Hawking vacuum state, such initial states make unnatural assumptions about ...
A. Polyakov   +6 more
core   +1 more source

The Experimental Flesh: Incarnation in Terms of Quantum Measurement and Phenomenological Perception

open access: yesPhenomenology & Practice, 2011
What is the relation of the human to the world and the things in it? Do the various forms of human interrogation of the world discover things, and with them, a world?
Will Johncock
doaj   +1 more source

The newfound relationship between extrachromosomal DNAs and excised signal circles

open access: yesFEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

How unitary cosmology generalizes thermodynamics and solves the inflationary entropy problem

open access: yes, 2011
We analyze cosmology assuming unitary quantum mechanics, using a tripartite partition into system, observer and environment degrees of freedom. This generalizes the second law of thermodynamics to "The system's entropy can't decrease unless it interacts ...
A. A. Starobinsky   +18 more
core   +1 more source

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