Degradation of lineal alkylbenzene sulphonate (LAS) in an acidogenic reactor bioaugmented with a Pseudomonas aeruginosa (M113) strain

2001 ◽  
Vol 44 (4) ◽  
pp. 183-188 ◽  
Author(s):  
F. J. Almendariz ◽  
M. Meráz ◽  
G. Soberón ◽  
O. Monroy
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carbon Source ◽  
Two Stage ◽  
Acidogenic Reactor ◽  
Anaerobic System

The degradation of of lineal alkylbenzene sulphonate (LAS) was studied in a two-stage anaerobic system where the acidogenic reactor was bioaugmented with a strain of Pseudomonas aeruginosa (M113). This is a strain, which under aerobic and denitrifying conditions uses LAS as carbon source. Results show that LAS was only degraded within the acidogenic stage while in the methanogenic reactor there was no degradation and eventually there was an inhibition due to a LAS accumulation in the sludge. During the experiment, the M113 strain remained in the acidogenic conglomerate (at around 104 CFU/mL) although there is no evidence of their involvement in LAS degradation.

Rhamnolipids stabilize quorum sensing mediated cooperation in Pseudomonas aeruginosa

2020 ◽  
Vol 367 (10) ◽  
Author(s):  
Rodolfo García-Contreras ◽  
Daniel Loarca ◽  
Caleb Pérez-González ◽  
J Guillermo Jiménez-Cortés ◽  
Abigail Gonzalez-Valdez ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Quorum Sensing ◽  
Carbon Source ◽  
Public Goods ◽  
Sole Carbon Source ◽  
Regulatory Genes ◽  
Chronic Infections ◽  
Toxic Metabolites ◽  
Serial Cultivation ◽  
Selection Of

ABSTRACT Pseudomonas aeruginosa is one of the main models to study social behaviors in bacteria since it synthesizes several exoproducts, including exoproteases and siderophores and release them to the environment. Exoproteases and siderophores are public goods that can be utilized by the individuals that produce them but also by non-producers, that are considered social cheaters. Molecularly exoprotease cheaters are mutants in regulatory genes such as lasR, and are commonly isolated from chronic infections and selected in the laboratory upon serial cultivation in media with protein as a sole carbon source. Despite that the production of exoproteases is exploitable, cooperators have also ways to restrict the growth and selection of social cheaters, for instance by producing toxic metabolites like pyocyanin. In this work, using bacterial competitions, serial cultivation and growth assays, we demonstrated that rhamnolipids which production is regulated by quorum sensing, selectively affect the growth of lasR mutants and are able to restrict social cheating, hence contributing to the maintenance of cooperation in Pseudomonas aeruginosa populations.

scholarly journals Modeling rhamnolipids production by Pseudomonas aeruginosa from immiscible carbon source in a batch system

2011 ◽  
Vol 8 (3) ◽  
pp. 471-482 ◽  
Author(s):  
S. A. Medina-Moreno ◽  
D. Jiménez-Islas ◽  
J. N. Gracida-Rodríguez ◽  
M. Gutiérrez-Rojas ◽  
I. J. Díaz-Ramírez
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carbon Source ◽  
Batch System

Carbon source effects on the mono/dirhamnolipid ratio produced by Pseudomonas aeruginosa L05, a new human respiratory isolate

2017 ◽  
Vol 39 ◽  
pp. 36-41 ◽  
Author(s):  
Marco S. Nicolò ◽  
Maria G. Cambria ◽  
Giuseppe Impallomeni ◽  
Maria G. Rizzo ◽  
Cinzia Pellicorio ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carbon Source ◽  
Source Effects ◽  
Respiratory Isolate

Two-stage co-hydrolysis of rice straw by Trichoderma reesei ZM4-F3 and Pseudomonas aeruginosa BSZ-07

2009 ◽  
Vol 33 (10) ◽  
pp. 1464-1468 ◽  
Author(s):  
Qiuzhuo Zhang ◽  
Guofu He ◽  
Juan Wang ◽  
Weimin Cai ◽  
Yatong Xu
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Trichoderma Reesei ◽  
Rice Straw ◽  
Two Stage ◽  
Hydrolysis Of

Antigenic variation and increase in pathogenicity in Pseudomonas aeruginosa as a result of growth on glucose or N-hexadecane as sole carbon source

1978 ◽  
Vol 24 (6) ◽  
pp. 675-679 ◽  
Author(s):  
Robert S. Stinson ◽  
D. E. Talburt
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carbon Source ◽  
Outer Membrane ◽  
Sole Carbon Source ◽  
Antigenic Variation ◽  
Protein Composition ◽  
Cell Types ◽  
Additional Protein

When Pseudomonas aeruginosa is grown on glucose as opposed to n-hexadecane as the sole carbon source, the antigenicity, virulence, and protein composition of the outer membrane are altered. The hydrocarbon-grown cells demonstrate a 3-log increase in virulence over the glucose-grown cells (in mice). There also appears to be an additional protein present in the outer membrane of the n-hexadecane-grown cells. This protein may contribute to the observed antigenic differences between the two cell types.

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