Gram positive and Gram negative bacteria differ in their sensitivity to cold plasma

Mai‐Prochnow, Anne; Clauson, Maryse; Hong, Jungmi; Murphy, Anthony B.

doi:10.1038/srep38610

Cited by 462 publications

(279 citation statements)

References 47 publications

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“…10,11,14,22 The effect can be explained by two factors: (a) decreased UV irradiance at higher levels of RH ( Figure 5A can and teichoic acids than gram-negative bacteria. 29,30 The average thicknesses of cell walls are in the ranges of 30-80 nm and 8-15 nm for gram-positive and gram-negative bacteria, respectively. 31 Comparing to the gram-negative bacteria, the thicker cell wall of gram-positive bacteria could block more UV light penetrating into the cells, resulting in higher resistance to UV irradiance.…”

Section: Disinfection Efficacy Of the In-duct Uv Lampmentioning

confidence: 99%

Disinfection by in‐duct ultraviolet lamps under different environmental conditions in turbulent airflows

et al. 2020

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In this study, we investigated the effects of environmental factors such as airflow velocity, relative humidity (RH), temperature, and duct reflectance on the performance of in‐duct UVC lamps. Staphylococcus epidermidis, Pseudomonas alcaligenes, and Escherichia coli were used as the test bacteria. The UV irradiance, disinfection efficacy, and UV susceptibility constant (Z value) of the test bacteria were experimentally determined. The results showed that the UV disinfection efficacy decreased as the airflow velocity and RH increased. The maximum UV disinfection efficacy was obtained at temperature of 20‐21°C compared with the performance at lower temperature (15‐16°C) and higher temperature (25‐26°C). When the RH increased from 50% to 90%, the Z values of airborne bacteria reduced by 40%, 60%, and 38% for S epidermidis, P alcaligenes, and E coli, respectively. Besides, susceptibility constants had lower values under both cooling temperature (15‐16°C) and heating temperature (25‐26°C) compared with that under the temperature of 20‐21°C. It was observed that S epidermidis generally had the highest resistance to the UV irradiance. The results also showed that the UV disinfection efficacy was lower in the duct with a black surface than in the clean duct.

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Section: Disinfection Efficacy Of the In-duct Uv Lampmentioning

confidence: 99%

Disinfection by in‐duct ultraviolet lamps under different environmental conditions in turbulent airflows

et al. 2020

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“…Moreover, a thin layer of peptidoglycan exists on the internal membrane, on which lipoprotein structures exist, followed by the external membrane only was seen in Gram‐negative bacteria with lipopolysaccharide structures. Such structures do not exist in Gram‐positive bacteria …”

Section: Resultsmentioning

confidence: 99%

Application of copper nanoparticles containing natural compounds in the treatment of bacterial and fungal diseases

Hemmati

Kamangar

Ahmeda

et al. 2020

Applied Organom Chemis

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The development of nanotechnology has generated different nanoscale‐sized materials, with metal‐based nanomaterials being some of the most interesting and promising. Thousands of articles in various specialized journals all over the world are dedicated to different metallic nanomaterials. Metallic nanomaterials are being widely researched, with gold‐, silver‐, iron‐, and copper‐based materials showing potential in medicine. Studies have demonstrated the effect of copper nanoparticles in medicinal herbs on the prevention, control, and treatment of microbial diseases. Experiments have examined the chemical characterization and assessment of the antioxidant, cytotoxicity, antibacterial, and antifungal activities of copper nanoparticles (Cu NPs) using the aqueous extract of Stachys lavandulifolia Vahl flower. These nanoparticles were characterized by UV–visible spectroscopy, field emission scanning electron microscopy (FE‐SEM), energy dispersive X‐ray spectroscopy, transmission electron microscopy (TEM), Fourier‐transform infrared spectroscopy (FT‐IR), and X‐ray diffraction analysis. TEM and FE‐SEM images exhibited a uniform spherical morphology and diameters of 10–25 nm for the biosynthesized nanoparticles. FT‐IR results suggested polysaccharides and protein in S. lavandulifolia acted as reducing agents, reducing copper ions to Cu NPs. In vitro biological experiments indicated that Cu NPs have excellent antioxidant potential against 2,2‐diphenyl‐1‐picrylhydrazyl, antifungal effects against Candida krusei, Candida parapsilosis, Candida guilliermondii, Candida glabrata, and Candida albicans, and antibacterial activities against Staphylococcus aureus, Enterococcus faecalis, Staphylococcus saprophyticus, Bacillus subtilis, Streptococcus pneumonia, Escherichia coli O157:H7, Salmonella typhimurium, Listeria monocytogenes, Proteus mirabilis, and Pseudomonas aeruginosa. These nanoparticles did not have cytotoxicity properties against human umbilical vein endothelial cells. These results indicate that the inclusion of S. lavandulifolia extract ameliorates the solubility of Cu NPs, which leads to a remarkable enhancement in fungicidal and bactericidal effects under in vitro conditions.

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“…143,144 For example, the Grampositive Bacillus subtilis, have a cell wall of 55.4 nm, the acid-fast M tuberculosis a 20.2 nm 145 while the Gramnegative Pseudomonas aeruginosa, has a cell wall of only a 2.4 nm. 146 Interestingly, although there are important functional differences between the mycobacteria cell wall and gram-positive bacteria, the DNA-based molecular taxonomy of bacteria based on the high similarity to genes, groups the classical acid fast-mycobacteria as gram-positive bacteria. 147 But this overall generalization regarding the susceptibility Figure 3 The three most important routes of antimicrobial action of AgNPs.…”

Section: Antibacterial Effect and Mechanism Of Silver Nanoparticlesmentioning

confidence: 99%

<p>Silver Nanoparticles for the Therapy of Tuberculosis</p>

Tabaran

Matea²,

Mocan³

et al. 2020

IJN

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Rapid emergence of aggressive, multidrug-resistant Mycobacteria strain represents the main cause of the current antimycobacterial-drug crisis and status of tuberculosis (TB) as a major global health problem. The relatively low-output of newly approved antibiotics contributes to the current orientation of research towards alternative antibacterial molecules such as advanced materials. Nanotechnology and nanoparticle research offers several exciting new-concepts and strategies which may prove to be valuable tools in improving the TB therapy. A new paradigm in antituberculous therapy using silver nanoparticles has the potential to overcome the medical limitations imposed in TB treatment by the drug resistance which is commonly reported for most of the current organic antibiotics. There is no doubt that AgNPs are promising future therapeutics for the medication of mycobacterial-induced diseases but the viability of this complementary strategy depends on overcoming several critical therapeutic issues as, poor delivery, variable intramacrophagic antimycobacterial efficiency, and residual toxicity. In this paper, we provide an overview of the pathology of mycobacterial-induced diseases, andhighlight the advantages and limitations of silver nanoparticles (AgNPs) in TB treatment.

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Gram positive and Gram negative bacteria differ in their sensitivity to cold plasma

Cited by 462 publications

References 47 publications

Disinfection by in‐duct ultraviolet lamps under different environmental conditions in turbulent airflows

Disinfection by in‐duct ultraviolet lamps under different environmental conditions in turbulent airflows

Application of copper nanoparticles containing natural compounds in the treatment of bacterial and fungal diseases

<p>Silver Nanoparticles for the Therapy of Tuberculosis</p>

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