Pyocin‐mediated antagonistic interactions in Pseudomonas spp. isolated in James Ross Island, Antarctica

2021 ◽  
Author(s):  
Kateřina Snopková ◽  
Kristýna Dufková ◽  
Ivo Chamrád ◽  
René Lenobel ◽  
Darina Čejková ◽  
...  
Keyword(s):  
Pseudomonas Spp ◽  
James Ross Island ◽  
Antagonistic Interactions

scholarly journals First evidence of high-molecular-weight bacteriocin (tailocin) produced by Antarctic Pseudomonas spp.

2018 ◽  
Vol 8 (2) ◽  
pp. 178-185
Author(s):  
Kateřina Snopková ◽  
Ivo Sedláček ◽  
David Šmajs
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polar Regions ◽  
Electron Microscopic ◽  
Pseudomonas Spp ◽  
Transmission Electron ◽  
Soil Ecosystems ◽  
James Ross Island ◽  
Inhibitory Agents ◽  
Dynamic Communities

Cold-adapted soil ecosystems represent dynamic communities varying in a structure, microbial abundance and metabolic activity. To antagonize competitors, soil bacteria produce a variety of inhibitory agents. We tested production of antimicrobials in Pseudomonas spp. isolated in James Ross Island, Antarctica, and performed transmission electron microscopic analyses of selected high-molecular-weight bacteriocin particles. The dimensions of R-tailocins produced by Pseudomonas sp. P2422 were 168 ± 2.0nm (length) and 16 ± 0.8nm (width) thus representing one of the largest tailocins secreted by Pseudomonas spp. To our knowledge, this is the first evidence of tailocin production by bacteria originated from polar regions.

Allelopathic and Medicinal plant. 26. Millettia speciosa

2020 ◽  
Vol 51 (2) ◽  
pp. 125-146
Author(s):  
Nasiruddin Nasiruddin ◽  
Yu Zhangxin ◽  
Ting Zhao Chen Guangying ◽  
Minghui Ji
Keyword(s):  
Community Structure ◽  
Medicinal Plant ◽  
Gel Electrophoresis ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Wiener Index ◽  
Pseudomonas Spp ◽  
Evenness Index ◽  
Gradient Gel Electrophoresis ◽  
Rhizosphere Pseudomonas

We grew cucumber in pots in greenhouse for 9-successive cropping cycles and analyzed the rhizosphere Pseudomonas spp. community structure and abundance by PCR-denaturing gradient gel electrophoresis and quantitative PCR. Results showed that continuous monocropping changed the cucumber rhizosphere Pseudomonas spp. community. The number of DGGE bands, Shannon-Wiener index and Evenness index decreased during the 3rd cropping and thereafter, increased up to the 7th cropping, however, however, afterwards they decreased again. The abundance of Pseudomonas spp. increased up to the 5th successive cropping and then decreased gradually. These findings indicated that the structure and abundance of Pseudomonas spp. community changed with long-term cucumber monocropping, which might be linked to soil sickness caused by its continuous monocropping.

The interaction of a manganese-oxidising bacterium as part of a biofilm growing on distribution pipe materials

2000 ◽  
Vol 41 (4-5) ◽  
pp. 295-300 ◽  
Author(s):  
F. Murdoch ◽  
P.G. Smith
Keyword(s):  
Biofilm Formation ◽  
Bacterial Activity ◽  
Confocal Laser ◽  
Pipe Surface ◽  
X Ray ◽  
Pseudomonas Spp ◽  
Eds Analysis ◽  
Large Clusters ◽  
Pipe Materials ◽  
Confocal Laser Microscope

The deposition of manganese within a biofilm growing on the surface of high-density polyethlene (HDPE) and polyvinychloride (PVC) was studied over a period of four months. The manganese rich water used in the study was inoculated with a manganese oxidising Pseudomonas spp. The level of Mn2+ in the water was monitored and was found to decrease as the biofilm formation increased. This was confirmed by energy dispersive X-ray spectroscopy (EDS) analysis which showed the detection of manganese was dependent on the presence of a biofilm. After two months a 100% removal of Mn2+ was observed in all the flasks inoculated by the Pseudomonas spp. and manganese micro-nodules, the formation of which were reported in Murdoch and Smith (1999), were being formed in large clusters across the surfaces of both the HDPE and PVC. The manganese peak area from the EDS spectrum analysis of the micro-nodules was significantly larger than was measured in the biofilm when these micro-nodules were absent. The scanning confocal laser microscope (SCLM) images of three-week samples showed high bacterial activity around areas where manganese micro-nodules were starting to form on the pipe surface.

scholarly journals Mutually-antagonistic interactions in baseball networks

2010 ◽  
Vol 389 (5) ◽  
pp. 1131-1141 ◽  
Author(s):  
Serguei Saavedra ◽  
Scott Powers ◽  
Trent McCotter ◽  
Mason A. Porter ◽  
Peter J. Mucha
Keyword(s):  
Antagonistic Interactions

scholarly journals The Fennoscandian Shield deep terrestrial virosphere suggests slow motion ‘boom and burst’ cycles

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Karin Holmfeldt ◽  
Emelie Nilsson ◽  
Domenico Simone ◽  
Margarita Lopez-Fernandez ◽  
Xiaofen Wu ◽  
...  
Keyword(s):  
Antibiotic Production ◽  
Nutrient Recycling ◽  
Slow Motion ◽  
Deep Biosphere ◽  
Wide Range ◽  
Domains Of Life ◽  
Microbial Turnover ◽  
Rna Transcript ◽  
Viral Isolates ◽  
Antagonistic Interactions

AbstractThe deep biosphere contains members from all three domains of life along with viruses. Here we investigate the deep terrestrial virosphere by sequencing community nucleic acids from three groundwaters of contrasting chemistries, origins, and ages. These viromes constitute a highly unique community compared to other environmental viromes and sequenced viral isolates. Viral host prediction suggests that many of the viruses are associated with Firmicutes and Patescibacteria, a superphylum lacking previously described active viruses. RNA transcript-based activity implies viral predation in the shallower marine water-fed groundwater, while the deeper and more oligotrophic waters appear to be in ‘metabolic standby’. Viral encoded antibiotic production and resistance systems suggest competition and antagonistic interactions. The data demonstrate a viral community with a wide range of predicted hosts that mediates nutrient recycling to support a higher microbial turnover than previously anticipated. This suggests the presence of ‘kill-the-winner’ oscillations creating slow motion ‘boom and burst’ cycles.

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