Entomopathogenic Bacteria Testing
Entomopathogenic Bacteria Testing - Related Videos
11:28
A Reference Broth Microdilution Method for Dalbavancin In Vitro Susceptibility Testing of Bacteria that Grow Aerobically
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Cited by 33 •
2015
Here, we present a protocol for determination of dalbavancin susceptibility of clinically relevant Gram-positive bacteria using a broth microdilution reference methodology.
05:35
A Broth Microdilution Method for Antibiotic Susceptibility Testing of Gram-Positive Bacteria
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2025
Source: Koeth, L. M., et. al., A Reference Broth Microdilution Method for Dalbavancin In Vitro Susceptibility Testing of Bacteria that Grow Aerobically. J. Vis. Exp. (2015).This video demonstrates the broth microdilution method for determining the minimum inhibitory concentration (MIC) of a lipoglycopeptide antibiotic against Gram-positive bacteria. It covers bacterial colony isolation, dilution, inoculation of microplate wells with varying antibiotic concentrations, and verification of culture...
07:17
Culturing and Genetically Manipulating Entomopathogenic Nematodes
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Cited by 7 •
2022
Entomopathogenic nematodes live in symbiosis with bacteria and together they successfully infect insects by undermining their innate immune system. To promote research on the genetic basis of nematode infection, methods for maintaining and genetically manipulating entomopathogenic nematodes are described.
10:05
Colorimetric Detection of Bacteria Using Litmus Test
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Cited by 5 •
2016
We describe a protocol for colorimetric detection of E. coli using a modified litmus test that takes advantage of an RNA-cleaving DNAzyme, urease, and magnetic beads.
07:47
Anxiety Testing
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2023
Anxiety is a commonly observed behavioral disorder that stems from fear. It is described as increased restlessness, or unpleasant feelings of fear over anticipated events. Experimenters often use rodent models to better understand anxiety disorders in humans. They use different paradigms, like exposing rodents to bright spaces or loud sounds, which are known to induce fear. These tests combined with other interventions such as surgery or drug-administration may assist researchers in pinpointing...
FAQs
Defined bacterial doses allow researchers to compare strains under controlled conditions rather than attributing differences to unequal exposure. Insects are then monitored for survival, infection progression, and disease symptoms. The resulting patterns help distinguish highly virulent strains from weaker candidates and reveal how host susceptibility changes the outcome of bacterial infection.
Several interacting mechanisms can determine infection success. Toxin production may damage the host, while gut invasion allows bacteria to move beyond the initial entry site. If bacteria evade or withstand systemic immune responses, infection can progress throughout the insect. Examining these mechanisms connects visible disease and mortality with specific stages of host-pathogen interaction.
Virulence describes how effectively a bacterial strain produces disease, whereas susceptibility reflects how readily a particular insect host is infected or harmed. Testing defined strains and doses while recording survival, symptoms, and infection progression helps separate these influences. Comparing outcomes across bacterial candidates and host responses supports a more precise interpretation of pathogenic performance.
A controlled bioassay begins by exposing insects to a defined bacterial dose. Researchers then follow the insects over time, recording survival, disease symptoms, and the progression of infection. These observations can be paired with examination of toxin production, gut invasion, and systemic immune responses, creating a linked view of exposure, mechanism, and biological outcome.
Survival data indicate whether exposure is associated with lethal infection, while disease symptoms and infection progression provide additional evidence about how the condition develops. Together, these measurements help characterize microbial virulence and identify biologically active strains. They also prevent mortality from being considered in isolation, since clinical signs and infection patterns add mechanistic context.
Insects provide a tractable host-pathogen model for examining how bacteria interact with host defenses, including systemic immune responses. The same testing framework can also guide the identification of microbial biocontrol agents. Thus, results contribute both to fundamental infection biology and to efforts to reduce reliance on chemical insecticides through biologically active bacterial strains.