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Related Concept Videos

Weighted Mean00:57

Weighted Mean

While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
ER Retrieval Pathway01:45

ER Retrieval Pathway

In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
Indirect Motor Pathways01:22

Indirect Motor Pathways

The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
Randomized Experiments01:13

Randomized Experiments

The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
Apparent Weight01:09

Apparent Weight

True weight is the measure of the gravitational force acting on an object. However, if the object accelerates, its measured weight is different from its true weight. Similar observations can be made when the object is submerged in water. An object's weight in water is its apparent weight, which is equal to the difference between its true weight and the buoyant forces.
Consider a person standing on a bathroom scale inside an elevator. If the scale is accurate at rest, its reading equals the...
Regression Toward the Mean01:52

Regression Toward the Mean

Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when researchers try to extrapolate results...

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Related Experiment Videos

The reweighted path ensemble.

Jutta Rogal1, Wolfgang Lechner, Jarek Juraszek

  • 1Interdisciplinary Centre for Advanced Materials Simulation, Ruhr University Bochum, 44780 Bochum, Germany.

The Journal of Chemical Physics
|November 9, 2010
PubMed
Summary
This summary is machine-generated.

We developed a new reweighting method for path ensembles in transition interface sampling. This technique enhances analysis of free energy landscapes and committor probabilities using any collective variables, aiding reaction coordinate optimization.

Related Experiment Videos

Area of Science:

  • Computational chemistry
  • Molecular dynamics
  • Statistical mechanics

Background:

  • Transition interface sampling (TIS) is a powerful enhanced sampling method for molecular simulations.
  • Analyzing free energy landscapes and committor probabilities is crucial for understanding molecular processes.
  • Current methods may have limitations in analyzing complex systems or arbitrary collective variables.

Purpose of the Study:

  • To introduce a novel reweighting scheme for path ensembles within the TIS framework.
  • To enable the analysis of free energy landscapes and committor projections in any collective variable space.
  • To demonstrate the utility of the reweighting scheme for optimizing reaction coordinates.

Main Methods:

  • Development of a reweighting scheme for path ensembles in TIS.
  • Application of the reweighting scheme to a 2D potential with a nonlinear reaction coordinate.
  • Illustration on a realistic simulation of the Trp-cage folding process.

Main Results:

  • The reweighting scheme successfully analyzes free energy landscapes and committor projections.
  • Demonstrated applicability in both simplified and complex molecular systems.
  • The method allows for analysis in arbitrary collective variable spaces.

Conclusions:

  • The proposed reweighting scheme offers a flexible and powerful tool for analyzing molecular dynamics simulations.
  • It facilitates a deeper understanding of complex molecular processes by enabling analysis in user-defined collective variables.
  • The reweighted path ensemble can guide the optimization of nonlinear reaction coordinates for enhanced sampling.