Microbiology

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    Protocols in Current Issue
    Primer ID Next-Generation Sequencing for the Analysis of a Broad Spectrum Antiviral Induced Transition Mutations and Errors Rates in a Coronavirus Genome
    [Abstract]

    Next generations sequencing (NGS) has become an important tool in biomedical research. The Primer ID approach combined with the MiSeq platform overcomes the limitation of PCR errors and reveals the true sampling depth of population sequencing, making it an ideal tool to study mutagenic effects of potential broad-spectrum antivirals on RNA viruses.

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    Determination of Antibacterial Activity of Film Coatings against Four Clinically Relevant Bacterial Strains
    [Abstract]

    Antibacterial coatings have currently gained great importance in biomedical technology investigations. Because of the spatial arrangement of the film coatings, evaluation of antibacterial activity presents a new challenge regarding traditional bacterial counting methods. In this protocol, four clinically relevant pathogens, Salmonella typhimurium,

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    Evaluation of Toxicity with Brine Shrimp Assay
    Authors:  Christina N. Banti and Sotiris K. Hadjikakou, date: 01/20/2021, view: 999, Q&A: 0
    [Abstract]

    The in vivo toxicity of new metallodrugs either as Small Bioactive Molecules (SBAMs) or Conjugates of Metals with Drugs (CoMeDs) or their hydrogels such as with hydroxyethyl-methacrylate (HEMA) (pHEMA@SBAMs or pHEMA@CoMeDs) are evaluated by the brine shrimp assay. Thus individuals of Artemia salina larvae are incubated in saline solutions with

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    Antimicrobial Sensitivity Assay for Bdellovibrio bacteriovorus
    Authors:  Emanuele Marine and Klaas M. Pos, date: 12/20/2020, view: 822, Q&A: 0
    [Abstract]

    Bdellovibrio bacteriovorus, an obligate predatory bacterium [i.e., bacteria that kill and feed on other bacteria (prey)], has the potential to be used as a probiotic for the disinfection of surfaces or for the treatment of bacterial infections. One option is to use this organism in combination with antimicrobials to potentiate the effectiveness of

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    Rapid Isolation and Purification of Secreted Bacteriocins from Streptococcus mutans and Other Lactic Acid Bacteria
    Authors:  Marcus Cheng, Siew-Ging Gong and Céline M. Lévesque, date: 11/20/2020, view: 1352, Q&A: 0
    [Abstract] Bacteriocins are small ribosomally synthesized antimicrobial peptides produced by some microorganisms including lactic acid bacteria (LAB), a group of Gram-positive bacteria (cocci, rods) expressing high tolerance for low pH. Bacteriocins kill bacteria rapidly and are biologically active at very low concentrations. Bacteriocins produced by LAB ...
    Construction and Validation of A Low-cost, Small-scale, Multiplex Continuous Culturing System for Microorganisms
    Authors:  Lilit Tonoyan, Freddy Guihéneuf, Ruari Friel and Vincent O’Flaherty, date: 11/05/2020, view: 881, Q&A: 0
    [Abstract]

    This protocol details the construction of a simple, low-cost, small-scale, multiplex chemostat system designed for the continuous cultivation of microorganisms in suspension (i.e., bacteria, yeast, microalgae). The continuous culture device can operate at a working volume of 25 ml and allows the run of 8 chemostats in parallel by a single person.

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    Neutrophil Extracellular Trap Killing Assay of Candida albicans
    Authors:  Sheng-Yang Wu and Betty A. Wu-Hsieh, date: 08/20/2020, view: 1676, Q&A: 0
    [Abstract] Fungal pathogen Candida albicans is one of the top leading causes of overall healthcare-associated bloodstream infections worldwide. Neutrophil is the major effector cell to clear C. albicans infection. Our study showed that mouse neutrophils utilize two independent mechanisms to kill C. albicans: one is CR3 downstream ...
    Contemporaneous Measurement of Outer and Inner Membrane Permeability in Gram-negative Bacteria
    Authors:  Bo Ma, Chao Fang, Jing Zhang, Mingzhi Wang, Xiaoxing Luo and Zheng Hou, date: 03/05/2020, view: 1921, Q&A: 0
    [Abstract] The emergence and rapid spread of multidrug resistance in bacteria have led to the urgent need for novel antibacterial agents. Membrane permeabilization is the mechanism for many antibacterial molecules that are being developed against gram-negative bacteria. Thus, to determine the efficacy of a potential antibacterial molecule, it is important to ...
    Rapid Detection of Proliferative Bacteria by Electrical Stimulation
    Authors:  Conor LA Edwards, Dmitry Malyshev, James P Stratford and Munehiro Asally, date: 02/05/2020, view: 2706, Q&A: 0
    [Abstract] Detecting live bacteria is an important task for antimicrobial susceptibility testing (AST) in the medical sector and for quality-monitoring in biological industries. Current methods for live-bacteria detection suffer limitations in speed or sensitivity. In a recent paper, we reported that electrical response dynamics in membrane potential enable ...
    Competition Assays to Quantify the Effect of Biocontrol Yeasts against Plant Pathogenic Fungi on Fruits
    Authors:  Electine Magoye, Melanie Pfister, Maja Hilber-Bodmer and Florian M. Freimoser, date: 02/05/2020, view: 1800, Q&A: 0
    [Abstract] Yeasts such as Aureobasidium pullulans are unicellular fungi that occur in all environments and play important roles in biotechnology, medicine, food and beverage production, research, and agriculture. In the latter, yeasts are explored as biocontrol agents for the control of plant pathogenic fungi (e.g., Botrytis cinerea, ...



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