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Angle of Twist - Elastic Range01:13

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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...
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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...
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Residual Stresses in Circular Shafts01:10

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
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Magnetic Tweezers for the Measurement of Twist and Torque
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A twist in the tail.

Karen Guillemin1, Annah S Rolig

  • 1Karen Guillemin is at the Institute of Molecular Biology, University of Oregon, Eugene, United States guillemin@molbio.uoregon.edu.

Elife
|March 6, 2014
PubMed
Summary
This summary is machine-generated.

The bacteria Vibrio fischeri releases lipopolysaccharide molecules via flagellar rotation, signaling its host, the Hawaiian bobtail squid, to prepare for colonization.

Keywords:
LPSVibrioanimal-microbe interactionscholeraefischeriflagella

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Area of Science:

  • Microbiology
  • Marine Biology
  • Symbiotic Interactions

Background:

  • The Hawaiian bobtail squid (Euprymna scolopes) hosts the symbiotic bacterium Vibrio fischeri.
  • Bacterial motility and molecular signaling are crucial for establishing symbiotic relationships.

Purpose of the Study:

  • To investigate the role of lipopolysaccharide (LPS) released by Vibrio fischeri in host-microbe interactions.
  • To understand the host's response to bacterial molecular cues during symbiosis initiation.

Main Methods:

  • Analysis of molecular components released by Vibrio fischeri during flagellar activity.
  • Observational studies on Hawaiian bobtail squid behavior in response to bacterial stimuli.

Main Results:

  • Lipopolysaccharide (LPS) molecules were identified as key signaling components released by Vibrio fischeri.
  • The presence of LPS triggers a preparatory response in the Hawaiian bobtail squid.

Conclusions:

  • Lipopolysaccharide acts as a crucial signal for the Hawaiian bobtail squid to anticipate the arrival of Vibrio fischeri.
  • This molecular communication facilitates the establishment of the symbiotic relationship between the squid and the bacterium.