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Title: A Rapid and High Throughput MIC Determination Method to Screen Uranium Resistant Microorganisms

Abstract

The assessment of minimum inhibitory concentration (MIC) is a conventional technique used for the screening of microbial resistance against antibiotics, biocides, and contaminants such as heavy metals. However, as part of our ongoing work, we have observed biases associated with using traditional liquid MIC method to screen microbial heavy metal resistance, including both bacterial and fungal strains. Specifically, the addition of uranium into synthetic media causes immediate precipitation prior to the initiation of microbial growth, thus hampering the optical density measurements, and the obtained MIC values are thus flawed and inaccurate. To address this discrepancy, we report the optimization and development of a serial-dilution-based MIC method conducted on solid growth media supplemented with uranium, which is more accurate, relative to the testing of MICs performed in liquid cultures. Notably, we report on the efficacy of this method to screen not only bacteria that are resistant to uranium but also demonstrate the successful application to yeast and fungal isolates, for their ability to resist uranium, is more accurate and sensitive relative to the liquid method. We believe that this newly developed method to screen heavy metal resistance, such as uranium, is far superior to the existing liquid MIC method and proposemore » replacing the liquid assay with the solid plate MIC reported herein.« less

Authors:
; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1602598
Grant/Contract Number:  
[#DE-AC09-08SR22470 [Task Order Agreements (TOAs) 0000403081 and 0000403082]]
Resource Type:
Published Article
Journal Name:
Methods and Protocols
Additional Journal Information:
[Journal Name: Methods and Protocols Journal Volume: 3 Journal Issue: 1]; Journal ID: ISSN 2409-9279
Publisher:
MDPI AG
Country of Publication:
Country unknown/Code not available
Language:
English

Citation Formats

Agarwal, Meenakshi, Rathore, Rajesh Singh, and Chauhan, Ashvini. A Rapid and High Throughput MIC Determination Method to Screen Uranium Resistant Microorganisms. Country unknown/Code not available: N. p., 2020. Web. doi:10.3390/mps3010021.
Agarwal, Meenakshi, Rathore, Rajesh Singh, & Chauhan, Ashvini. A Rapid and High Throughput MIC Determination Method to Screen Uranium Resistant Microorganisms. Country unknown/Code not available. doi:10.3390/mps3010021.
Agarwal, Meenakshi, Rathore, Rajesh Singh, and Chauhan, Ashvini. Tue . "A Rapid and High Throughput MIC Determination Method to Screen Uranium Resistant Microorganisms". Country unknown/Code not available. doi:10.3390/mps3010021.
@article{osti_1602598,
title = {A Rapid and High Throughput MIC Determination Method to Screen Uranium Resistant Microorganisms},
author = {Agarwal, Meenakshi and Rathore, Rajesh Singh and Chauhan, Ashvini},
abstractNote = {The assessment of minimum inhibitory concentration (MIC) is a conventional technique used for the screening of microbial resistance against antibiotics, biocides, and contaminants such as heavy metals. However, as part of our ongoing work, we have observed biases associated with using traditional liquid MIC method to screen microbial heavy metal resistance, including both bacterial and fungal strains. Specifically, the addition of uranium into synthetic media causes immediate precipitation prior to the initiation of microbial growth, thus hampering the optical density measurements, and the obtained MIC values are thus flawed and inaccurate. To address this discrepancy, we report the optimization and development of a serial-dilution-based MIC method conducted on solid growth media supplemented with uranium, which is more accurate, relative to the testing of MICs performed in liquid cultures. Notably, we report on the efficacy of this method to screen not only bacteria that are resistant to uranium but also demonstrate the successful application to yeast and fungal isolates, for their ability to resist uranium, is more accurate and sensitive relative to the liquid method. We believe that this newly developed method to screen heavy metal resistance, such as uranium, is far superior to the existing liquid MIC method and propose replacing the liquid assay with the solid plate MIC reported herein.},
doi = {10.3390/mps3010021},
journal = {Methods and Protocols},
number = [1],
volume = [3],
place = {Country unknown/Code not available},
year = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.3390/mps3010021

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