scholarly journals Particulate malate oxidation in strictly aerobic bacteria

1970 ◽  
Vol 118 (2) ◽  
pp. 27P-28P
Author(s):  
M Jones ◽  
H K King
Keyword(s):  
Aerobic Bacteria ◽  
Strictly Aerobic ◽  
Malate Oxidation

Isolation and Identification of Ammonibacteria and Ammoniation Characteristic Analysis

2011 ◽  
Vol 340 ◽  
pp. 280-286 ◽  
Author(s):  
Wen Yi Zhang ◽  
Fang Yuan Tan ◽  
Ting Ting Zhao ◽  
Li Qiao Lu ◽  
Ning Han
Keyword(s):  
Organic Nitrogen ◽  
Ph Value ◽  
Ammonia Nitrogen ◽  
Aerobic Bacteria ◽  
Strictly Aerobic ◽  
High Concentration ◽  
Characteristic Analysis ◽  
Isolation And Identification ◽  
Suitable Temperature ◽  
Biochemistry Test

Two strains of T1, Z1 ammonibacterium were isolated from the biofilm of the BAF reactor. According to the morphologic observation and physiological biochemistry test, the strains T1, Z1 were preliminarily identified asProteusandMicrococcus respectively. The research of the strains T1, Z1 for ammoniation characteristics indicated that the suitable temperature was 30°C, the suitable pH value was 7.0 and the best inoculum quantity was 5%. The strain T1 was strictly aerobic bacteria and Z1 was facultative aerobic bacteria. In these operating parameters, two strains of T1, Z1 were good of the degradation of organic nitrogen and the growth rate of ammonia nitrogen could respectively reach up to 86.91% and 69.98%. The strains T1, Z1 had a certainly practical value for treating the waste water with the high concentration of organic nitrogen.

Changes in sediment viral and bacterial abundances with hypolimnetic oxygen depletion in a shallow eutrophic Lac Brome (Quebec, Canada)

2000 ◽  
Vol 57 (6) ◽  
pp. 1284-1290 ◽  
Author(s):  
Mahaut Ricciardi-Rigault ◽  
David F Bird ◽  
Yves T Prairie
Keyword(s):  
Microbial Community ◽  
Oxygen Depletion ◽  
Aerobic Bacteria ◽  
Strictly Aerobic ◽  
Incubation Experiment ◽  
Population Densities ◽  
Viral Lysis ◽  
P Content ◽  
Hypolimnetic Oxygen ◽  
Oxygen Status

Two studies were conducted to examine changes in sediment viral and bacterial abundances following hypolimnetic oxygen depletion. Both studies, a spatiotemporal field study and a core incubation experiment set under controlled conditions, demonstrated that bacterial and viral abundances decreased significantly (43-48% for bacteria and 36-38% for viruses) and in a nearly identical pattern when submitted to changes in the oxygen status of their milieu. The consistency of the results strongly suggests that the shift in both population densities is essentially caused by the onset of anoxia, either directly or indirectly. We suggest that the decline in abundance is due to the disappearance of strictly aerobic bacteria and their associated viruses and not due to stress-induced viral lysis. We also show that the P content of the lysed microbial community can represent an important source of P released from the sediments.

Microbiological purity of syringes containing composites in the context of cross-infection prevention in dental practices

2020 ◽  
Vol 33 (2) ◽  
pp. 102-105
Author(s):  
Joanna Bialowska ◽  
Witold Bojar ◽  
Tomasz Zareba ◽  
Stefan Tyski ◽  
Barbara Tymczyna-Borowicz
Keyword(s):  
Infection Prevention ◽  
Dental Materials ◽  
Cross Infection ◽  
Aerobic Bacteria ◽  
Filling Material ◽  
Bodily Fluids ◽  
Dental Office ◽  
Dental Practices ◽  
Dental Offices ◽  
Aerobic And Anaerobic

AbstractCross-infection involves the transmission of microorganisms through secretions, bodily fluids and excreta, as well as undisinfected surfaces and medical equipment. In the dental office, diseases are transmitted via various routes, e.g. from patient to dentist or other member of dental team, from doctor or dental team member to patient, from patient to another patient, from dental office to community and from community to patient. The study was conducted to evaluate the effectiveness of infection control in dental practices based on the qualitative and quantitative assessment of microbiological contaminants detected on the surface of filling material packaging used in dental offices. The material for research were 9 packages containing dental materials during their use in 3 dental settings. The packages were placed in sterile flasks and rinsed to wash microorganisms from the surfaces. The washes were filtered through membrane filters and cultured under proper aerobic and anaerobic conditions, and at elevated CO2 concentration. Microbial growth on TIO and TSB media was observed. The contamination of most samples remained low as indicated by the growth from one to a maximum of five colonies on TSA. The contamination remained at the level of 10-50 CFU/package, i.e. <100 CFU/single package. The tests evaluating the contamination of dental package surfaces with aerobic bacteria confirmed high hygiene standards observed in dental offices from which the packages were brought.

Use of a dynamic gassing-out method for activity and oxygen diffusion coefficient estimation in biofilms

1998 ◽  
Vol 37 (4-5) ◽  
pp. 171-175
Author(s):  
Artem Khlebnikov ◽  
Falilou Samb ◽  
Paul Péringer
Keyword(s):  
Diffusion Coefficient ◽  
Oxygen Uptake ◽  
Oxygen Diffusion ◽  
Fixed Bed ◽  
Biofilm Reactor ◽  
Strictly Aerobic ◽  
Comamonas Testosteroni ◽  
Respiration Activity ◽  
Oxygen Diffusion Coefficient ◽  
Biofilm Development

p-toluenesulphonic acid degradation by Comamonas testosteroni T-2 in multi-species biofilms was studied in a fixed bed biofilm reactor. The polypropylene static mixer elements (Sulzer Chemtech Ltd., Switzerland) were used as a support matrix for biofilm formation. Biofilm respiration was estimated using the dynamic gassing-out oxygen uptake method. A strong relation between oxygen uptake and reactor degradation efficiency was observed, because p-toluenesulphonate degradation is a strictly aerobic process. This technique also allowed us to estimate the thickness of the active layer in the studied system. The mean active thickness was in order of 200 μm, which is close to maximum oxygen penetration depth in biofilms. A transient mathematical model was established to evaluate oxygen diffusitivity in non-steady-state biofilms. Based on the DO concentration profiles, the oxygen diffusion coefficient and the maximum respiration activity were calculated. The oxygen diffusion coefficient obtained (2 10−10-1.2 10−9 m2 s−1) is in good agreement with published values. The DO diffusion coefficient varied with biofilm development. This may be, most likely, due to the biofilm density changes during the experiments. The knowledge of diffusivity changes in biofilms is particularly important for removal capacity estimation and appropriate reactor design.

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