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Torsion of Noncircular Members01:16

Torsion of Noncircular Members

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Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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Adnexal Torsion.

Oluyemisi Adeyemi-Fowode1, Kate A McCracken2, Nicole J Todd3

  • 1Division of Pediatric and Adolescent Gynecology, Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas.

Journal of Pediatric and Adolescent Gynecology
|April 14, 2018
PubMed
Summary
This summary is machine-generated.

Adnexal torsion, a twisting of the ovary or fallopian tube, requires prompt treatment to preserve fertility. This report offers clinical recommendations for adolescents, covering diagnosis and management.

Keywords:
Adnexal torsionAdolescentsOvarian torsionPediatricsSurgical managementTubal torsion

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Area of Science:

  • Gynecology
  • Reproductive Health
  • Pediatric Surgery

Background:

  • Adnexal torsion involves rotation of the ovary and/or fallopian tube on its vascular pedicle.
  • It is an uncommon gynecologic emergency with potential adverse effects on fertility if treatment is delayed.

Purpose of the Study:

  • To provide evidence-based clinical recommendations for adnexal torsion in adolescents.
  • To outline the epidemiology, clinical presentation, diagnostic strategies, and management options.

Main Methods:

  • Literature review of recent evidence on adnexal torsion.
  • Synthesis of findings to formulate clinical guidelines.

Main Results:

  • Adnexal torsion is rare but critical, especially in adolescents.
  • Timely diagnosis and intervention are key to preventing ovarian damage and preserving fertility.

Conclusions:

  • Early recognition and appropriate management of adnexal torsion in adolescents are crucial.
  • Clinical guidelines should focus on prompt diagnosis and fertility-sparing treatment strategies.