scholarly journals Tessaracoccus bendigoensis gen. nov., sp. nov., a Gram-positive coccus occurring in regular packages or tetrads, isolated from activated sludge biomass

1999 ◽  
Vol 49 (2) ◽  
pp. 459-468 ◽  
Author(s):  
A. M. Maszenan ◽  
R. J. Seviour ◽  
B. K. C. Patel ◽  
P. Schumann ◽  
G. N. Rees
Keyword(s):  
Activated Sludge ◽  
Gram Positive ◽  
Positive Coccus

scholarly journals The Effect of Asparagine on the Growth of a Gram-Positive Coccus

1961 ◽  
Vol 24 (1) ◽  
pp. 25-30 ◽  
Author(s):  
E. I. Garvie ◽  
M. E. Gregory ◽  
L. A. Mabbitt
Keyword(s):  
Gram Positive ◽  
Positive Coccus

N-methyl-2-pyrrolidone-degrading bacteria from activated sludge

2015 ◽  
Vol 71 (5) ◽  
pp. 776-782 ◽  
Author(s):  
Karel Křížek ◽  
Jan Růžička ◽  
Markéta Julinová ◽  
Lucie Husárová ◽  
Josef Houser ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Organic Compounds ◽  
Research Paper ◽  
Gram Positive ◽  
Gram Negative ◽  
Vast Array ◽  
Degrading Bacteria ◽  
Two Samples

N-methyl-2-pyrrolidone (NMP) is a widely used solvent for many organic compounds and a component found in a vast array of chemical preparations. For this research paper, NMP degrading bacteria were isolated from two samples of activated sludge. They pertained to both Gram-negative and Gram-positive members, and belong to the Pseudomonas, Paracoccus, Acinetobacter and Rhodococcus genera. All the strains utilized 300 mg/L of NMP as the only source of carbon, energy and nitrogen over several days, and they were shown to additionally be able to degrade N-acetylphenylalanine (NAP). The growth of all the isolated strains was recorded at different NMP concentrations, to a maximum of 20 g/L.

Full-scale control of Mycolata foam by FEX-120 addition

2010 ◽  
Vol 61 (10) ◽  
pp. 2443-2450 ◽  
Author(s):  
C. Kragelund ◽  
B. Nilsson ◽  
K. Eskilsson ◽  
A. M. Bøgh ◽  
P. H. Nielsen
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
No Reduction ◽  
Treatment Plant ◽  
Full Scale ◽  
Filamentous Bacteria ◽  
Gram Positive ◽  
Sludge Treatment ◽  
Scale Control

Foaming incidents in activated sludge treatment plants are a worldwide problem and occur on a regular basis in both municipal and industrial activated sludge treatment plants. Foaming is most often caused by excessive growth of filamentous bacteria, especially the gram-positive ones affiliated within the Actinobacteria, e.g. the branched Mycolata or CandidatusMicrothrix parvicella. Previous studies have shown that populations of Microthrix can be controlled by addition of certain polyaluminium compounds, but until now no effective chemicals have been identified to control other important foam formers such as the Mycolata. A new chemical (FilamentEx, FEX-120) was tested in full-scale in a Swedish wastewater treatment plant (WWTP) with immense foaming problems. In total, three different dosing events were carried out for more than 1 year. After only 8–17 weeks in each period, all foam had disappeared, and dosing of FEX-120 was stopped. Another 11 full-scale WWTPs in different countries were treated with FEX-120 because of severe Mycolata foaming on process tanks. In nine out of 11 plants, where the causative organisms were Gordonia or Skermania, a significant reduction of foam up to 100% was observed after treatment for approx. 10 weeks. In two WWTPs with unknown Mycolata organisms, no reduction was observed.

The “Nostocoida limicola” story: resolving the phylogeny of this morphotype responsible for bulking in activated sludge

2002 ◽  
Vol 46 (1-2) ◽  
pp. 105-110 ◽  
Author(s):  
R.J. Seviour ◽  
J.-R. Liu ◽  
E.M. Seviour ◽  
C.A. McKenzie ◽  
L.L. Blackall ◽  
...  
Keyword(s):  
16S Rrna ◽  
Activated Sludge ◽  
Pure Culture ◽  
Sequence Analyses ◽  
Rrna Sequence ◽  
Gram Positive ◽  
16S Rrna Sequence ◽  
Culture Studies ◽  
Gram Positive Bacteria ◽  
Morphological Variants

On the basis of 16S rRNA sequence analyses of several isolates of “Nostocoida limicola” from activated sludge plants in Australia and other countries, it is clear that “N. limicola” I, II and III are not three morphological variants of a single bacterium but at least three phylogenetically different bacteria. Data show that “N. limicola” I are members of at least two genera in the low mol% G+C Gram-positive bacteria, while some isolates of “N.limicola” II belong to the high mol% G+C Gram positive bacteria, and “N.limicola” III is a member of the Planctomycetales. Design and application of 16S rRNA targeted probes for each to biomass samples suggests that their phylogeny is more diverse than pure culture studies would suggest.

Effect of acclimating saccharides on the activated sludge bacterial population: composition abnormality of activated sludge acclimated to glucose

1998 ◽  
Vol 37 (4-5) ◽  
pp. 99-103
Author(s):  
Yuu Ubukata ◽  
Susumu Takii
Keyword(s):  
Molecular Weight ◽  
Chemical Composition ◽  
Activated Sludge ◽  
Bacterial Population ◽  
Municipal Sewage ◽  
Appreciable Amount ◽  
Low Molecular Weight ◽  
Population Composition ◽  
Gram Positive ◽  
Gram Negative

The question of whether the substitution of glucose for starch in municipal sewage as an acclimating saccharide for activated sludge (AS) in the laboratory is valid was investigated using activated sludges acclimated to glucose (G-AS) and dextrin (D-AS), since the bacteria responsible for starch (dextrin) removal in D-AS are verified to take up maltose instead of glucose during dextrin removal. In G-AS, polysaccharides are the major reserve materials, and large amounts of residual organic materials (ROM) are excreted from the AS. In contrast, in D-AS, about half of the reserve materials are low molecular weight saccharides, and no appreciable amount of ROM was detected. It is considered that most bacteria responsible for the removal of dextrin and glucose are Gram-negative and Gram-positive, respectively, based on the results of the chemical composition of AS and the type of reserve saccharide. As a result, in laboratory-scale AS processes, maltose (disaccharide) or dextrin (polysaccharide), instead of glucose (monosaccharide), should be used as a substitute for starch.

scholarly journals Gemella bacteremia: an unlikely source of an unlikely cul-prit

2017 ◽  
Vol 5 (1) ◽  
pp. 139
Author(s):  
William Li ◽  
Harvir Gambhir
Keyword(s):  
Oral Cavity ◽  
Liver Abscess ◽  
Mixed Infection ◽  
Infectious Endocarditis ◽  
Gram Positive ◽  
The Past ◽  
Positive Coccus

Gemella is an anaerobic or microaerophlic gram positive coccus generally an inhabitant of the oral cavity and gastrointestinal flora which has been associated with poor dentition and infectious endocarditis in the past along with seldom cases of meningitis and liver abscess noted in literature. Oftentimes co-existing with other bacteria as a mixed infection, we highlight the case of a bacteremic individual with gemella as a single isolated organism from a source gemella is not commonly known to inhabit.

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