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Related Concept Videos

Bacterial Flora of the Large Intestine01:29

Bacterial Flora of the Large Intestine

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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
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Anatomy of the Intestines01:23

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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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The stomach comprises several layers that work together to facilitate digestion and protect the organ. The outermost layer is called the serosa, which provides support and protection to the stomach. The muscularis externa layer is responsible for the mechanical breakdown of food by contracting and moving the stomach. The submucosa layer, located beneath the muscularis externa, contains connective tissue, blood vessels, nerves, and glands that secrete mucus and other substances essential for...
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Assessment of the Rectum and Anus01:25

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Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
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Related Experiment Video

Updated: Aug 1, 2025

Visualization of Gut Microbiota-host Interactions via Fluorescence In Situ Hybridization, Lectin Staining, and Imaging
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The gut microbiome-Does stool represent right?

Orly Levitan1,2, Lanying Ma3, Donato Giovannelli4,5

  • 1Hygieacare Inc., Norfolk, VA, USA.

Heliyon
|April 27, 2023
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Summary
This summary is machine-generated.

Stool samples inadequately represent the inner-colonic microbiome. Inner-colonic lavage samples reveal distinct microbial communities, crucial for future gut health research and personalized medicine.

Keywords:
16S rRNABiogeographyBowel PrepBowel prepColonoscopyDrug designGut microbiomeInnovationMicrobiomeNGSPersonalized medicinePrepStratificationWGS

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Area of Science:

  • Microbiome research
  • Gastroenterology
  • Molecular biology

Background:

  • Stool microbiome studies are common but may not accurately reflect the inner-colonic environment.
  • The hypothesis posits that stool is an insufficient proxy for the in-situ colonic microbiome.

Purpose of the Study:

  • To analyze inner-colonic microbiota obtained non-invasively via colonic lavage.
  • To compare inner-colonic microbiota with traditional stool samples.
  • To investigate differences across colonic segments (ascending, transverse, descending).

Main Methods:

  • Prospective clinical study involving up to 20 patients undergoing colonic lavage.
  • Non-invasive collection of inner-colonic samples from different colon regions.
  • Analysis using 16S rRNA and shotgun metagenomic sequencing.

Main Results:

  • Distinct biogeographic gradients were observed in the inner-colonic microbiota.
  • Significant differences were found between inner-colonic and stool samples, particularly in the proximal colon.
  • A high percentage of unique microbial information was identified exclusively in inner-colonic samples.

Conclusions:

  • Inner-colonic lavage provides a more accurate representation of the colonic microbiome than stool.
  • The method of sample collection is critical for preserving microbial signatures.
  • Inner-colonic samples are essential for developing novel biomarkers, targeted therapies, and personalized medicine approaches.