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5 results on '"N'Guyen MH"'

1. Besoins en phosphore des bactéries métabolisant les hydrocarbures en mer

Author

N'Guyen Mh and Petit J

Subjects
Ecology, Phosphorus, Immunology, chemistry.chemical_element, General Medicine, Bacterial growth, Biology, Applied Microbiology and Biotechnology, Microbiology, Salinity, chemistry, Ionic strength, Environmental chemistry, Genetics, Molecular Biology
Abstract

The artificial stimulation of biological purification of sea-pollutant hydrocarbons requires phosphorus supply. The concentrations, corresponding to the optimal bacterial growth, depend, in particular, on ionic strength. They range between 2 and 8 × 10−4 M for waters in which the salinity is close to the mean salinity of an oceanic environment and between 1.5 and 3 × 10−3 M when these waters receive a significant supply of freshwater or when salinity is naturally weak. Inhibition of bacterial development has been observed either with a microflora, or with pure strains for concentrations higher than the upper limits of concentrations so defined.

Published
1976

2. Isolation and characterisation of 8-hydroxy-3Z,5Z-tetradecadienoic acid, a putative intermediate in Pichia guilliermondii gamma-decalactone biosynthesis from ricinoleic acid.

Author

Iacazio G, Martini D, Faure B, and N'Guyen MH

Subjects
Chromatography, High Pressure Liquid, Fatty Acids, Unsaturated metabolism, Gas Chromatography-Mass Spectrometry, Hydroxy Acids metabolism, Nuclear Magnetic Resonance, Biomolecular, Spectrophotometry, Infrared, Spectrophotometry, Ultraviolet, Fatty Acids, Unsaturated isolation & purification, Hydroxy Acids isolation & purification, Lactones metabolism, Pichia metabolism, Ricinoleic Acids metabolism
Abstract

During a screening procedure for the discovery of a strong gamma-decalactone producer from ricinoleic acid, we observed that the yeast Pichia guilliermondii accumulated transiently 8-hydroxy-3Z,5Z-tetradecadienoic acid 1 during gamma-decalactone biosynthesis in the stationary phase of growth. The structural elucidation of 1 was based on nuclear magnetic resonance, infrared, ultraviolet and gas chromatography-mass spectrometry experiments. The occurrence of 1 is discussed in relation with previously proposed gamma-decalactone biosynthetic pathways.

Published
2002
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3. [On the taxonomy and physiology of bacteria utilizing hydrocarbons in the sea (author's transl)].

Author

Le Petit J, Bertrand JC, N'Guyen MH, and Tagger S

Subjects
Acetates metabolism, Acinetobacter metabolism, Alcaligenes metabolism, Chloramphenicol pharmacology, Oxygen Consumption, Pseudomonas metabolism, Water Microbiology, Alkanes metabolism, Arthrobacter classification, Arthrobacter isolation & purification, Arthrobacter metabolism, Gram-Negative Aerobic Bacteria classification, Gram-Negative Aerobic Bacteria isolation & purification, Gram-Negative Aerobic Bacteria metabolism, Seawater
Abstract

Using mineral media with gas oil as sole carbon source, 191 bacterial strains were isolated from the costal area of Marseille. These strains were attributed to Achromobacter, Alcaligenes, Pseudomonas, Acinetobacter and Arthrobacter genera. Amongst isolated strains there was a predominance of the Alcaligenes-Achromobacter group over others genera. Growth and respiratory activity of 5 strains were studied on hexadecane and acetate. Respiratory activity on hexadecane of 32 strains cultured on acetate has been measured. These strains could be placed in two groups. The group 1 shows an immediate respiratory activity which is not abolished by chloramphenicol. The group 2 presents either an immediate or a delayed respiratory activity which is always abolished by chloramphenicol. Maintenance or suppression of respiration by chloramphenicol is a character which is homogenously distributed amongst the species.

Published
1975

4. [Phosphorus requirements of bacteria metabolizing hydrocarbons in the sea].

Author

Petit J and N'Guyen MH

Subjects
Acetates metabolism, Acinetobacter growth & development, Acinetobacter metabolism, Alcaligenes growth & development, Alcaligenes metabolism, Osmolar Concentration, Pseudomonas aeruginosa growth & development, Pseudomonas aeruginosa metabolism, Seawater, Sodium Chloride pharmacology, Water Pollution, Chemical, Alkanes metabolism, Bacteria metabolism, Phosphorus metabolism, Water Microbiology
Abstract

The artificial stimulation of biological purification of sea-pollutant hydrocarbons requires phosphorus supply. The concentrations, corresponding to the optimal bacterial growth, depend, in particular on ionic strength. They range between 2 and 8 X 10(-4) M for waters in which the salinity is close to the mean salinity of an oceanic environment and between 1.5 and 3 X 10(-3) M when these waters receive a significant supply of freshwater or when salinity is naturally weak. Inhibition of bacterial development has been observed either with a microflora, or with pure strains for concentrations higher than the upper limits of concentrations so defined.

Published
1976

5. [Study of intervention of yeasts in biodegradation in sea of hydrocarbons].

Author

Le Petit J, N'Guyen MH, and Deveze L

Subjects
Biodegradation, Environmental, Candida metabolism, France, Mitosporic Fungi metabolism, Seawater, Water Pollution, Yeasts anatomy & histology, Yeasts growth & development, Yeasts isolation & purification, Yeasts metabolism, Hydrocarbons metabolism, Water Microbiology
Published
1970

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