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Related Concept Videos

Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
Block Diagram Reduction01:22

Block Diagram Reduction

The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
The first step in this process is the identification and relocation of a branch point. A branch point, where a...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Rationalizing Substitutions01:29

Rationalizing Substitutions

Integrals involving non-rational functions are often difficult to evaluate using standard techniques, especially when radicals appear in the integrand. Rationalizing substitution provides a systematic method for simplifying such integrals by converting them into rational forms that are easier to handle.Consider a rod whose linear mass density depends on a constant linear density, a characteristic length, and the distance from the left end of the rod. Determining the total mass requires...
Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.

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Related Experiment Videos

ALC: automated reduction of rule-based models.

Markus Koschorreck1, Ernst Dieter Gilles

  • 1Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstr, 1, 39106 Magdeburg, Germany. koschorreck@mpi-magdeburg.mpg.de

BMC Systems Biology
|November 1, 2008
PubMed
Summary

Automated Layer Construction (ALC) simplifies modeling complex cellular signaling pathways using a layer-based approach. This tool generates reduced, modular models, enabling the study of previously inaccessible biological systems.

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Area of Science:

  • Computational Biology
  • Systems Biology
  • Biophysics

Background:

  • Cellular signal transduction modeling faces combinatorial complexity due to numerous protein interactions.
  • The layer-based approach offers an accurate, approximative method to reduce model complexity and enhance modularity.
  • This approach enables the modeling of biological systems previously intractable due to their complexity.

Purpose of the Study:

  • To introduce Automated Layer Construction (ALC), a software tool designed to facilitate the creation of layer-based reduced models.
  • To simplify the process of building modular models for complex biological systems.

Main Methods:

  • ALC utilizes a rule-based syntax supporting modularity and macrostates for model definition.
  • The software performs automated consistency checks on the defined models.
  • ALC generates ready-to-run simulation files in various formats (C MEX, MATLAB, Mathematica, SBML).

Main Results:

  • ALC significantly simplifies the generation of layer-based reduced models.
  • The tool outputs models in multiple formats, streamlining simulation and analysis.
  • Additional documentation is provided to aid in model publication and presentation.

Conclusions:

  • ALC enables straightforward, rule-based generation of layer-based reduced models.
  • The generated model files are directly usable for simulations across different platforms.