Results 51 to 60 of about 10,930 (306)

Michelson-Morley Experiment and The Second Postulate of STR [PDF]

open access: yes, 2003
This note discusses the fact that the Second Postulate in the Special Theory of Relativity (STR) is an absolute statement which implicitly acknowledges, despite the claim in [3] to the contrary, the existence of what was known as "ether".
Noninski, Vesselin
core  

Lectures on faster-than-light travel and time travel

open access: yesSciPost Physics Lecture Notes, 2019
These lecture notes were prepared for a 25-hour course for advanced undergraduate students participating in Perimeter Institute's Undergraduate Summer Program.
Barak Shoshany
doaj   +1 more source

Relative morsification theory

open access: yesTopology, 2004
In this paper we develope a Morsification Theory for holomorphic functions defining a singularity of finite codimension with respect to an ideal, which recovers most previously known Morsification results for non-isolated singulatities and generalize them to a much wider context.
openaire   +4 more sources

An unexpected alternative viologen electron mediator site in tungsten‐containing formate dehydrogenase

open access: yesFEBS Letters, EarlyView.
An unexpected alternative interaction site for ethyl viologen was identified in formate dehydrogenase 1 from Methylorubrum extorquens. Combined mutagenesis, kinetic analysis, and docking revealed that aromatic residues near an iron–sulfur cluster enable flavin mononucleotide‐independent electron transfer, offering a framework for engineering improved ...
Eleni G. Poloniataki, Yong Hwan Kim
wiley   +1 more source

Aristotle’s law of contradiction and Einstein’s special theory of relativity

open access: yes, 2019
Objective: The aim of this study is to re-evaluate the relationship between Aristotle’s law of contradiction and Einstein’s special theory of relativity.
Barukčić, Ilija
core   +1 more source

Conformal Relativity versus Brans–Dicke and Superstring Theories

open access: yesEntropy, 2012
We show how conformal relativity is related to Brans–Dicke theory and to low-energy-effective superstring theory. Conformal relativity or the Hoyle–Narlikar theory is invariant with respect to conformal transformations of the metric.
David B. Blaschke, Mariusz P. Dąbrowski
doaj   +1 more source

Cell geometry and membrane protein crowding constrain Escherichia coli growth rate, overflow metabolism, respiration, and maintenance energy

open access: yesFEBS Letters, EarlyView.
The physical dimensions and shape of bacterial cells define the surface area available to acquire nutrients and the volume available for synthesizing proteins and DNA. Here, we use computational systems biology to decode the importance of cell geometry as a major determinant of prokaryotic phenotype, including growth rate and metabolic efficiency. This
Ross P. Carlson   +6 more
wiley   +1 more source

New Coordinate Vacuum Solution in Cosmological General Theory of Relativity

open access: yes, 2021
In the general relativity theory, we discover new vacuum solution by Einstein’s gravity field equation. We investigate the new coordinate in cosmological general theory of relativity (CGTR)
Sangwha Yi
core   +1 more source

A física clássica de cabeça para baixo: como Einstein descobriu a teoria da relatividade especial

open access: yesRevista Brasileira de Ensino de Física
Albert Einstein por duas vezes alterou de maneira profunda nossos conceitos de espaço e tempo com a sua teoria da relatividade: primeiro no âmbito da teoria especial de 1905 e depois com a teoria geral de 1915.
Jürgen Renn
doaj   +1 more source

Microbiome−host proteostasis crosstalk—An emerging perspective on mechanisms and interventions toward healthy longevity

open access: yesFEBS Letters, EarlyView.
Proteostasis and the gut microbiota play a key role in shaping host physiology. Microbiota‐derived metabolites, vitamins, and RNA modulate host proteostasis. Findings from model systems, including C. elegans, indicate microbes can either stabilize or disrupt host proteostasis.
Abhishek Anil Dubey, Maria Ermolaeva
wiley   +1 more source

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