Kirby Bauer Method
Kirby Bauer Method - Related Videos
04:30
A Flame-Free Method for Sterilizing C. elegans Picks, Spatulas, and Scalpels
0 Views •
Cited by 1 •
2022
This article describes a method for sterilizing worm picks, spatulas, and scalpels using a micro-incinerator in place of an open flame.
12:03
Antimicrobial Synergy Testing by the Inkjet Printer-assisted Automated Checkerboard Array and the Manual Time-kill Method
0 Views •
Cited by 42 •
2019
Antimicrobial synergy testing is used to evaluate the effect of two or more antibiotics used in combination and is typically performed by one of two methods: the checkerboard array or the time-kill assay. Here, we present an automated, inkjet printer-assisted checkerboard array synergy technique and a classic time-kill synergy study.
10:04
Using Fluorescent Proteins to Monitor Glycosome Dynamics in the African Trypanosome
0 Views •
Cited by 4 •
2014
Glycosome dynamics in African trypanosomes are difficult to study by traditional cell biology techniques such as electron and fluorescence microscopy. As a means of observing dynamic organelle behavior, a fluorescent-organelle reporter system has been used in conjunction with flow cytometry to monitor real-time glycosome dynamics in live parasites.
01:29
Methods of Sterilization I: Physical Methods
0 Views •
2025
As used in a healthcare facility, sterilization destroys all microorganisms through physical or chemical methods. The physical method includes steam, dry heat, boiling water, and radiation. Steam sterilization uses non-toxic, low-cost moist heat in the form of saturated steam under pressure, which is fast, microbicidal, and sporicidal, and quickly warms and penetrates fabrics. Autoclaves, or steam sterilizers, expose each item to direct steam contact for a predetermined time at the necessary...
01:30
Methods of Sterilization II: Chemical Methods
0 Views •
2023
In healthcare, the chemical method of sterilization uses chemical sterilants to treat surgical instruments and medical supplies to help prevent the transmission of infectious pathogens to patients. Due to heat sensitivity, most medical supplies and equipment should not be exposed to high temperatures. These parts include rubber, plastic, glass, and other similar elements. Using chemical sterilization rather than heat to clean out equipment is recommended. It eradicates and removes all bacteria,...
FAQs
Standardization makes results comparable between bacterial isolates and experiments. The assay uses a standardized bacterial suspension, a defined Mueller-Hinton agar medium, antibiotic-impregnated disks, and interpretive standards. Controlling these elements helps ensure that differences in zone size primarily reflect the isolate’s response to the tested antimicrobial agents rather than inconsistent testing conditions.
After the disks are placed on the inoculated agar, antimicrobial compounds diffuse outward through the medium. Where the local drug concentration suppresses bacterial growth, a clear zone forms around the disk. The measured diameter reflects the combined effect of diffusion and susceptibility, so zone measurements must be interpreted with established standards rather than viewed as drug activity alone.
A zone of inhibition is an observed measurement, not an interpretation by itself. Comparing its diameter with interpretive standards allows the isolate to be classified as susceptible or resistant to the selected agent. This classification gives the result practical meaning for antimicrobial selection and prevents researchers from relying on arbitrary visual differences between zones.
The workflow begins by preparing a standardized suspension of the bacterial isolate and spreading it across Mueller-Hinton agar. Antibiotic-impregnated disks are then applied to the inoculated surface, followed by incubation. After growth and diffusion occur, investigators measure the inhibition zones and compare those values with interpretive standards to assign susceptibility classifications.
Mueller-Hinton agar provides the defined medium on which the bacterial suspension is spread and through which antimicrobial agents diffuse. Its role is therefore central to producing measurable inhibition zones under the assay conditions. Using the specified medium supports consistent comparisons among tested agents and isolates, which is essential for interpreting susceptibility results.
The resulting classifications can inform antimicrobial selection for a bacterial isolate, support surveillance of resistance patterns, and help evaluate pathogen responses to treatment. In immunology and infection research, repeated testing can connect susceptibility findings with broader investigations of how infectious organisms respond when exposed to selected antimicrobial agents.