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Related Concept Videos

Transformations of Functions I01:29

Transformations of Functions I

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A function's graph can be modified by changing its position or size without altering its overall shape. These transformations allow the graph to be moved across the coordinate plane while preserving its pattern and structure. One of the most common transformations is shifting, which repositions the graph without distorting it.When the output of a function is adjusted by adding or subtracting a constant, the graph shifts vertically. A positive value moves the graph upward, while a negative value...
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Transformations of Functions II01:29

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Transformations in mathematics alter the position or orientation of a function’s graph while preserving its fundamental shape. One important type of transformation is the horizontal shift, which involves modifying the input variable within a function’s equation. This operation affects where outputs occur along the horizontal axis but does not alter the function’s overall structure.A horizontal shift is achieved by replacing the input variable x with either x + c or x - c,...
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Transformations of Functions III01:20

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Transformations modify the graphical representation of a function without changing its fundamental form. One common transformation is reflection, which flips the graph across a designated axis. When the vertical coordinates of all points are multiplied by the negative one, the entire graph is mirrored over the horizontal axis. This transformation reverses the vertical orientation of peaks and troughs, akin to signal inversion in electrical systems, where a waveform is flipped, but the timing of...
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Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
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Three mutations in Escherichia coli that generate transformable functional flagella.

Wenjing Wang1, Zhengzeng Jiang, Martin Westermann

  • 1Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Jena, Germany.

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Mutations in Escherichia coli flagella alter their structure, changing them from left-handed to right-handed or straight forms. These modified flagella can still propel bacteria, suggesting similar adaptable structures may exist in natural environments.

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Area of Science:

  • Microbiology
  • Biophysics
  • Molecular Biology

Background:

  • Bacterial flagella are helical structures crucial for motility.
  • Hydrodynamics dictates that rotating helices generate propulsion.
  • Existing models assume bacterial flagella have fixed pitches.

Purpose of the Study:

  • To characterize flagellar structure in novel Escherichia coli mutants.
  • To investigate the functional implications of altered flagellar morphology.
  • To explore the adaptability of bacterial flagella.

Main Methods:

  • Isolation and characterization of three distinct flagellar mutants in Escherichia coli.
  • Microscopic analysis of flagellar morphology (handedness, pitch, and shape).
  • Assessment of bacterial motility and flagellar function under varying conditions.

Main Results:

  • Identified mutations leading to right-handed or straight flagellar forms.
  • Demonstrated that altered flagella retain propulsive capability.
  • Observed pH-dependent transformations in flagellar structure.

Conclusions:

  • Bacterial flagella can exhibit structural plasticity beyond fixed helical forms.
  • Mutations can alter flagellar handedness and shape while maintaining motility.
  • Transformable flagella may be advantageous and prevalent in natural bacterial populations.