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Friction: Problem Solving01:17

Friction: Problem Solving

Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
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Updated: Jun 28, 2026

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community
11:28

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community

Published on: May 28, 2007

33.1K

A 'devil' of a problem.

Victoria L Hansen1, Robert D Miller2

  • 1Animal Biosciences and Biotechnology Laboratory, United States Department of Agriculture/Agricultural Research Service, Beltsville, United States.

Elife
|August 15, 2018
PubMed
Summary
This summary is machine-generated.

A second contagious cancer, Devil Facial Tumor Disease 2 (DFTD2), was discovered in Tasmanian devils. This finding offers new insights into how transmissible cancers emerge and spread in wildlife populations.

Keywords:
MHCMHC-1Sarcophilus harrisiiTasmanian devilcancer biologycontagious cancerimmune escapeimmunologyinflammation

Related Experiment Videos

Last Updated: Jun 28, 2026

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community
11:28

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community

Published on: May 28, 2007

33.1K

Area of Science:

  • * Conservation Genetics
  • * Wildlife Epidemiology
  • * Cancer Biology

Background:

  • * Tasmanian devils are endangered by Devil Facial Tumor Disease (DFTD), a transmissible cancer.
  • * The emergence of novel contagious cancers poses a significant threat to wildlife conservation efforts.

Purpose of the Study:

  • * To report the discovery and initial characterization of a second distinct transmissible cancer in Tasmanian devils.
  • * To investigate the evolutionary origins and potential spread of this new cancer, DFTD2.
  • * To understand the factors contributing to the emergence of contagious cancers in isolated populations.

Main Methods:

  • * Genomic sequencing and phylogenetic analysis of tumor and host tissues.
  • * Epidemiological data collection and spatial analysis of disease distribution.
  • * Comparative analysis of DFTD and DFTD2 genetic and morphological characteristics.

Main Results:

  • * Confirmation of a second, independent transmissible cancer, designated DFTD2, in Tasmanian devils.
  • * Genomic data suggests DFTD2 arose from a different cell lineage than DFTD.
  • * DFTD2 exhibits distinct genetic markers and a different geographical distribution compared to DFTD.

Conclusions:

  • * The discovery of DFTD2 highlights the propensity for contagious cancers to emerge and evolve in vulnerable wildlife.
  • * Understanding the drivers of DFTD2 emergence is crucial for developing effective conservation and management strategies.
  • * This finding underscores the importance of ongoing surveillance for novel transmissible diseases in endangered species.