Gnotobiotic Bag System
Gnotobiotic Bag System - Related Videos
06:09
Establishment and Maintenance of Gnotobiotic American Cockroaches (Periplaneta americana)
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Cited by 6 •
2021
This protocol is used in establishing and maintaining gnotobiotic American cockroaches (Periplaneta americana) by surface sterilizing the egg cases (oothecae) prior to hatching. These gnotobiotic insects contain their vertically transmitted Blattabacterium endosymbionts but have axenic guts.
09:34
Rearing the Fruit Fly Drosophila melanogaster Under Axenic and Gnotobiotic Conditions
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Cited by 123 •
2016
A method for rearing Drosophila melanogaster under axenic and gnotobiotic conditions is presented. Fly embryos are dechorionated in sodium hypochlorite, transferred aseptically to sterile diet, and reared in closed containers. Inoculating diet and embryos with bacteria leads to gnotobiotic associations, and bacterial presence is confirmed by plating whole-body Drosophila homogenates.
09:32
Isolation of Human Monocytes by Double Gradient Centrifugation and Their Differentiation to Macrophages in Teflon-coated Cell Culture Bags
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Cited by 94 •
2014
We present a simple and efficient protocol for the generation of human macrophages. Buffy coats are processed by double density gradient centrifugation and isolated monocytes are then differentiated to macrophages in Teflon-coated cell culture bags. This maximizes macrophage yields and facilitates cell harvesting for subsequent experiments.
07:51
A Gnotobiotic System for Studying Microbiome Assembly in the Phyllosphere and in Vegetable Fermentation
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Cited by 2 •
2020
A method of growing germ-free Napa cabbages has been developed which enables researchers to evaluate how single microbial species or multispecies microbial communities interact on cabbage leaf surfaces. A sterile vegetable extract is also presented which can be used to measure shifts in community composition during vegetable fermentation.
07:47
Assembly and Use of a Plant Gnotobiotic Growth System for Plant–Microbe Interaction Studies in Cereals
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2026
This protocol describes the assembly and use of a new plant gnotobiotic growth system designed to accommodate cereals and validated in wheat and maize. This plant gnotobiotic system enables controlled plant–microbe experiments by providing sterile growth conditions, irrigation management, and compatibility with diverse soil-based substrates.
FAQs
The system combines a sealed plastic enclosure with controlled transfer of sterilized food, bedding, air, and equipment. These entry procedures reduce contact with external microorganisms, helping maintain the intended biological conditions around the animals. Because the microbial environment remains restricted, researchers can better distinguish effects caused by selected microbes from effects associated with uncontrolled microbial exposure.
Germ-free animals are maintained without the microorganisms that would otherwise be present, whereas defined-microbiota animals receive selected microbes introduced into the enclosed system. This distinction lets investigators compare responses in the absence of microbial exposure with responses produced by a known bacterial species or community, supporting more precise analysis of host–microbe relationships.
Limiting microbial variables makes it easier to connect a particular microorganism or community with a physiological or disease-related outcome. In less controlled conditions, differences in naturally occurring microbes could complicate interpretation. The bag system therefore supports comparisons in which microbial composition is a deliberate experimental factor, allowing biological responses to be linked more directly to that factor.
Researchers place sterilized food, bedding, air, and equipment into the enclosed environment through controlled transfer procedures. After the animals are housed under these conditions, selected microbes can be introduced to establish a defined community. The sequence is important because both the incoming materials and the microbial inoculation determine which biological conditions are maintained during the study.
The system is useful for investigating host–microbe interactions, immune development, infection, nutrition, and the effects of specific bacterial species. It is especially valuable when researchers need to examine how one microorganism or a defined community influences the host. By narrowing microbial variation, the approach can reveal relationships that are difficult to isolate in broader biological settings.
Outcomes from animals carrying no microbes, a selected bacterium, or a defined microbial community can help associate microbial conditions with physiological and disease-related changes. This provides a controlled framework for examining whether particular organisms or communities correspond to altered host responses. Such comparisons strengthen interpretation of microbial contributions without requiring researchers to treat the entire microbial environment as unknown.