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1.
Lett Appl Microbiol ; 77(2)2024 Feb 01.
Article in English | MEDLINE | ID: mdl-38337184

ABSTRACT

This work reviews biofilm investigation techniques and highlights the benefits and drawbacks of each approach focusing especially on Pseudomonas syringae and may serve as a comprehensive guide for any early-career researchers starting with the topic of biofilm. Each approach with applications of individual microscopy and spectroscopy techniques is summarized together with characterization of Pseudomonas syringae and its role in pathogenesis.


Subject(s)
Biofilms , Pseudomonas syringae , Pseudomonas syringae/genetics , Plant Diseases
2.
Appl Spectrosc ; 77(5): 500-512, 2023 May.
Article in English | MEDLINE | ID: mdl-36898963

ABSTRACT

Biofilms of sessile Pseudomonas syringae cells formed on top of plant host's leaves or fruits allow surviving harsh environmental conditions (desiccation) and improve their resistance to antibacterial treatments of crops. A better understanding of these biofilms can help minimize their effect on harvests. In the present study, infrared attenuated total reflection spectroscopy coupled with optical and confocal laser scanning microscopy has been applied for the first time to analyze Pseudomonas syringae pathovar morsprunorum biofilm development in real time. The biofilm development was observed within a spectral window 4000-800 cm-1 under constant flow conditions for 72 h. The kinetics of representative integrated band areas (nucleic acids with polysaccharides at 1141-1006 cm-1, amino acid side chains with free fatty acids at 1420-1380 cm-1, proteins at 1580-1490 cm-1, and lipids with proteins at 2935-2915 cm-1) were analyzed with regard to the observed biofilm structure and the following P. syringae biofilm developmental stages were attributed: The inoculation phase, washing of weakly attached bacteria closely followed by recolonization of the vacated surface, the restructuration phase, and finally the maturation phase.


Subject(s)
Biofilms , Pseudomonas syringae , Fourier Analysis , Spectroscopy, Fourier Transform Infrared/methods , Proteins
3.
Lett Appl Microbiol ; 74(6): 924-931, 2022 Jun.
Article in English | MEDLINE | ID: mdl-35239229

ABSTRACT

We studied the disinfection efficacy of boron-doped electrodes on Escherichia coli-contaminated water-based solutions in three different electrolytes, physiological solution (NaCl), phosphate buffer (PB), and phosphate buffer saline (PBS). The effect of the electrochemical oxidation treatment on the bacteria viability was studied by drop and spread plate cultivation methods, and supported by optical density measurements. We have found that bacterial suspensions in NaCl and PBS underwent a total inactivation of all viable bacteria within 10 min of the electrochemical treatment. By contrast, experiments performed in the PB showed a relatively minor decrease of viability by two orders of magnitude after 2 h of the treatment, which is almost comparable with the untreated control. The enhanced bacterial inactivation was assigned to reactive chlorine species, capable of penetrating the bacterial cytoplasmic membrane and killing bacteria from within.


Subject(s)
Boron , Escherichia coli K12 , Boron/chemistry , Boron/pharmacology , Electrodes , Electrolytes/pharmacology , Escherichia coli , Oxidation-Reduction , Phosphates/pharmacology , Sodium Chloride/pharmacology
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