Twist Inducible Model
Twist Inducible Model - Related Videos
11:41
Magnetic Tweezers for the Measurement of Twist and Torque
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Cited by 16 •
2014
Magnetic tweezers, a powerful single-molecule manipulation technique, can be adapted for the direct measurements of the twist (using a configuration called freely-orbiting magnetic tweezers) and torque (using a configuration termed magnetic torque tweezers) in biological macromolecules. Guidelines for performing such measurements are given, including applications to the study of DNA and associated nucleo-protein filaments.
01:13
Angle of Twist: Problem Solving
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2024
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...
01:13
Angle of Twist - Elastic Range
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2024
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
01:13
Induced-fit Model
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2019
Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon. Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
07:58
Methods to Characterize Spontaneous and Startle-induced Locomotion in a Rotenone-induced Parkinson's Disease Model of Drosophila
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Cited by 10 •
2014
Parkinson’s disease is a neurodegenerative disorder that results from the degeneration of dopaminergic neurons in the central nervous system, causing locomotion defects. Rotenone models Parkinson’s disease in Drosophila. This paper outlines two assays that characterize both spontaneous and startle-induced locomotion deficiencies caused by rotenone.
FAQs
Changing Twist activity at defined times helps separate immediate responses from changes that emerge later. Researchers can examine early shifts in gene expression or cell state and then follow longer-term effects on migration or differentiation. Reversibility adds another comparison: returning Twist toward its prior state can help assess whether observed changes depend on continued Twist activity.
Restricting Twist manipulation to selected cells or tissues helps connect the factor’s activity with effects in a particular biological context. This design can distinguish cell-intrinsic changes from broader tissue-level consequences and supports more focused interpretation of altered gene expression, cell state, migration, or differentiation. It is especially useful when Twist functions differently across developmental or tumor environments.
Several outcomes provide complementary evidence: gene-expression changes indicate regulatory effects, altered cell state reflects shifts in cellular identity, and changes in migration can indicate modified motile behavior. Differentiation provides another endpoint. In cancer studies, these measurements can be considered together with epithelial–mesenchymal transition and tumor invasion to connect Twist activity with broader changes in cell behavior.
A time-controlled design allows observations at different stages after Twist activation or suppression, rather than relying on a single endpoint. Early measurements can capture direct or rapid responses, while later measurements reveal accumulated effects on cell state, migration, differentiation, or gene expression. Comparing these stages helps clarify which outcomes track closely with Twist manipulation and which develop over time.
These models support investigations of developmental processes, epithelial–mesenchymal transition, tumor invasion, and cancer progression. They can show how changing Twist activity influences cellular behavior within a controlled time window. Because the system can also be reversible, researchers can examine whether effects persist after the manipulation changes, providing context for interpreting Twist-dependent pathways and possible therapeutic targets.
By linking controlled Twist changes with gene expression, cell state, migration, differentiation, or invasion-related outcomes, the model helps identify biological effects associated with this transcription factor. Temporal control is valuable because it can distinguish responses that follow Twist activity from longer-term consequences. That information can guide evaluation of Twist-related pathways as potential therapeutic targets in cancer research.