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When analyzing a beam subjected to various loads, it is crucial to understand the internal forces and moments generated within the structure. These internal forces can be broadly classified into normal forces, shear forces, and bending moments. To determine these forces and moments, we use the method of sections and apply a specific sign convention based on their direction and the side of the section being analyzed.
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Related Experiment Video

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Gnotobiotic and Conventional Mouse Systems to Support Microbiota Based Studies.

Richard Lavin1, Nicholas DiBenedetto1, Vladimir Yeliseyev1

  • 1Massachusetts Host-Microbiome Center, Department Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts.

Current Protocols in Immunology
|July 17, 2018
PubMed
Summary

Mouse models are crucial for studying host-microbiota interactions and their impact on health and disease. Gnotobiotic mice enable precise colonization studies to understand microbial roles in development and illness.

Keywords:
germfreegnotobiotichost-microbiomemicrobiotamurine models

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Area of Science:

  • Microbiology
  • Immunology
  • Genetics

Background:

  • Host-microbiota interactions are critical for health and disease pathogenesis.
  • Mouse models are widely used for pre-clinical research, including microbiome studies.
  • Understanding microbial roles is key for developing therapeutics and biomarkers.

Purpose of the Study:

  • To highlight the importance of animal models, specifically mice, in dissecting host-microbiota interactions.
  • To outline the utility of gnotobiotic mice for colonization studies.
  • To provide guidance on designing robust host-microbiome experiments.

Main Methods:

  • Utilizing genetically tractable mouse models.
  • Employing gnotobiotic (germfree) conditions for controlled colonization.
  • Incorporating microbial consortia and environmental perturbations.

Main Results:

  • Mice serve as valuable models to define microbial contributions to homeostasis and disease.
  • Gnotobiotic mice allow for specific *in vivo* colonization studies.
  • Experimental designs can identify causal effects of microbiota.

Conclusions:

  • Mouse models, particularly gnotobiotic mice, are indispensable for advancing microbiome research.
  • Controlled experiments are essential for elucidating the *in vivo* impact of microbial communities.
  • This framework supports the identification of microbial roles in health and disease.