Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

9.5K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
9.5K
Responses to Gravity and Touch02:26

Responses to Gravity and Touch

42.0K
Gravitropism: Plant Responses to Gravity
42.0K
Center of Gravity00:58

Center of Gravity

6.8K
The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
6.8K
Center of Gravity01:15

Center of Gravity

2.2K
The center of gravity is the point at which an object's weight appears to be concentrated and can be used to balance the object perfectly. This point is essential in mechanics as it provides information regarding a body's stability and moments of inertia. The center of gravity does not always have to fall within the shape or boundaries of the body; it may also lie outside the body in certain cases.
To determine its location, the principle of moments can be utilized by dividing the object into...
2.2K
Histone Modification02:32

Histone Modification

16.3K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
16.3K
Work Done by Gravity01:04

Work Done by Gravity

8.8K
Gravitation is one of the four fundamental forces in nature. The force between objects on Earth and Earth itself is called gravity.
Like other forces, gravity does work on an object if it displaces it toward the Earth's center. In this case, the work done by gravity is said to be positive. If an external force acts on the object against the pull of gravity and manages to lift it away from the Earth's center, work is done against gravity. In this case, the net work done is said to be...
8.8K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

New futures for cosmological models.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2022
Same author

Modified gravity revealed along geodesic tracks.

The European physical journal. C, Particles and fields·2019
Same author

Forecast and analysis of the cosmological redshift drift.

The European physical journal. C, Particles and fields·2018
Same author

Recognizing Axionic Dark Matter by Compton and de Broglie Scale Modulation of Pulsar Timing.

Physical review letters·2017
Same author

Measuring the speed of light with baryon acoustic oscillations.

Physical review letters·2015
Same author

Constructing phantom cosmologies from standard scalar field universes.

Physical review letters·2003
Same journal

Quantitative understanding of PDF fits and their uncertainties.

The European physical journal. C, Particles and fields·2026
Same journal

Probing the Higgs portal to a strongly-interacting dark sector at the FCC-ee.

The European physical journal. C, Particles and fields·2026
Same journal

Quantifying vacuum-like jets in heavy-ion collisions: a machine learning study.

The European physical journal. C, Particles and fields·2026
Same journal

High-energy decays and weak quantum measurements.

The European physical journal. C, Particles and fields·2026
Same journal

Combined effective field theory interpretation of Higgs boson, electroweak vector boson, top quark, and multijet measurements.

The European physical journal. C, Particles and fields·2026
Same journal

A journey to ITACA: Ion Tracking with Ammonium Cations Apparatus.

The European physical journal. C, Particles and fields·2026
See all related articles

Related Experiment Video

Updated: Feb 12, 2026

Profiling of H3K4me3 Modification in Plants using Cleavage under Targets and Tagmentation
09:48

Profiling of H3K4me3 Modification in Plants using Cleavage under Targets and Tagmentation

Published on: April 22, 2022

4.5K

f(R) gravity modifications: from the action to the data.

Ruth Lazkoz1, María Ortiz-Baños1, Vincenzo Salzano2

  • 11Department of Theoretical Physics, University of the Basque Country UPV/EHU, P.O. Box 644, 48080 Bilbao, Spain.

The European Physical Journal. C, Particles and Fields
|March 27, 2018
PubMed
Summary
This summary is machine-generated.

Modified gravity models offer alternatives to General Relativity for cosmic acceleration. This study reformulates f(R) theories using redshift (z) and proposes new models, finding no statistical preference but offering a novel perspective for future gravity research.

More Related Videos

Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes
08:39

Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes

Published on: December 22, 2020

4.7K
Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis
11:02

Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis

Published on: May 17, 2016

30.5K

Related Experiment Videos

Last Updated: Feb 12, 2026

Profiling of H3K4me3 Modification in Plants using Cleavage under Targets and Tagmentation
09:48

Profiling of H3K4me3 Modification in Plants using Cleavage under Targets and Tagmentation

Published on: April 22, 2022

4.5K
Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes
08:39

Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes

Published on: December 22, 2020

4.7K
Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis
11:02

Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis

Published on: May 17, 2016

30.5K

Area of Science:

  • Cosmology
  • Modified Gravity Theories
  • General Relativity

Background:

  • Modified gravity models are potential alternatives to General Relativity for explaining the universe's accelerated expansion.
  • Distinguishing between modified gravity theories and General Relativity remains a challenge.

Purpose of the Study:

  • To reformulate f(R) theories as explicit functions of redshift, f(z).
  • To propose and test new f(z) parameterizations that deviate from the standard Lambda-CDM model.
  • To explore a novel approach for developing observationally reliable alternative gravity models.

Main Methods:

  • Reformulating f(R) Lagrangian terms into redshift-dependent functions, f(z).
  • Expressing f(R) in the Lambda-CDM context as a polynomial with constant and third-order terms.
  • Proposing various polynomial f(z) parameterizations and comparing them with observational data using Bayesian Evidence.

Main Results:

  • No statistically significant preference was found for the proposed f(z) models over the standard Lambda-CDM model.
  • Some proposed models demonstrated comparable performance to Lambda-CDM based on Bayesian Evidence comparison.
  • The study highlights the potential of the f(z) approach despite not yielding statistically superior models.

Conclusions:

  • The f(z) reformulation offers a new perspective for developing alternative gravity models.
  • While no definitive preference emerged, the approach provides a framework for future investigations.
  • Further research is needed to refine these models and their observational validation.