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Related Concept Videos

Social Exchange Theory02:06

Social Exchange Theory

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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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Social Exchange Theory01:26

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As formulated by John Thibaut and Harold Kelley, Social Exchange Theory explains human relationships as economic-like exchanges that maximize rewards and minimize costs. This theory suggests that individuals engage in relationships to gain benefits and reduce burdens, similar to economic transactions. It has been widely applied to various types of relationships, including romantic, professional, and social interactions.Rewards and Costs in RelationshipsRelationship rewards include emotional...
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Gas Exchange and Transport01:20

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Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
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The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
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Related Experiment Video

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The Replica Set Method: A High-throughput Approach to Quantitatively Measure Caenorhabditis elegans Lifespan
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Replica-Exchange Methods for Biomolecular Simulations.

Yuji Sugita1,2,3, Motoshi Kamiya4, Hiraku Oshima5

  • 1Theoretical Molecular Science Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan. sugita@riken.jp.

Methods in Molecular Biology (Clifton, N.J.)
|August 10, 2019
PubMed
Summary
This summary is machine-generated.

A novel replica-exchange molecular dynamics (REMD) method enhances computer simulations for complex systems like protein folding. This efficient technique improves sampling and is applied to N-glycan structures.

Keywords:
Detailed balance and global balanceFree-energy landscapeN-GlycansReplica exchange with solute temperingReplica-exchange molecular dynamics methodReplica-exchange umbrella samplingReweighting approaches

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Area of Science:

  • Computational Chemistry
  • Biophysics
  • Molecular Dynamics Simulations

Background:

  • Complex systems like spin glasses and protein folding present conformational sampling challenges in computer simulations.
  • Traditional molecular dynamics (MD) struggles with rugged free-energy landscapes, hindering accurate modeling.
  • The replica-exchange method was developed to address these sampling difficulties.

Purpose of the Study:

  • To present and discuss the replica-exchange molecular dynamics (REMD) method and its algorithmic enhancements.
  • To apply REMD and related techniques to simulate the conformational dynamics of N-glycans in solution.
  • To compare the sampling efficiency and free-energy convergence of various enhanced sampling methods.

Main Methods:

  • Development and application of replica-exchange molecular dynamics (REMD).
  • Integration of REMD with other sampling techniques: replica exchange with solute tempering and Gaussian accelerated MD (GaMD).
  • Simulation of N-glycan structures in solution using the GENESIS software package.

Main Results:

  • REMD and its variants demonstrate improved sampling efficiency for complex molecular systems.
  • Comparison of different enhanced sampling methods reveals variations in convergence of free-energy changes for N-glycans.
  • The study provides practical simulation protocols and analysis methods for advanced molecular simulations.

Conclusions:

  • REMD is a powerful and versatile tool for overcoming sampling limitations in molecular simulations.
  • Enhanced sampling techniques like REMD, solute tempering, and GaMD are crucial for studying biological molecules.
  • The provided protocols facilitate the application of advanced simulation methods in biophysical research.