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Growth requirements for microorganisms

In reality, the fuel storage tank is a two-phase system - a fuel phase and a water bottom phase. Some bacterial cells and fungal spores can survive dormant in dry fuel for months to several years Hormoconis resinae) (Gardner, 1971). However, cells can only grow and reproduce in the water phase, primarily at the fuel/water [Pg.180]

Dissolved water is also present in the fuel. The amount of water solubility in fuel is related to the hydroearbon ehain length, the presence of an aromatic structure, and temperature. Shorter chain paraffins dissolve more water than the longer chain paraffins. Kerosene fuels are more susceptible to microbial attack because they have a greater capacity to absorb dissolved water than other fuel types. There is 1 part per million (ppm) of dissolved water in aviation kerosene fuel for every degree Celsius (C) above zero (Park, 1975). An aromatie hydroearbon ean dissolve five times more water than straight chain hydrocarbons. Chemicals used to treat fuel such as preservatives can also contribute to the dissolved water content. [Pg.180]


Incubation temperatures shall be appropriate for the specific growth requirements of microorganisms that are anticipated in the aseptic filling area. Note Environmental monitoring data can assist... [Pg.880]

There is an absolute growth requirement for polyamines in some microorganisms, mammalian cells, and higher plants. Active growth and cell division are correlated with increased rates of macromolecular and polyamine synthesis. Increased polyamine biosynthesis during the Gi phase of the cell cycle, just preceding the onset of DNA synthesis in dividing cells, appears to be a universal phenomenon in animals and plants (Slocum et al., 1984). [Pg.520]

Pyridoxal is known to catalyse racemisation of amino acids in the model systems studied by Snell and coworkers but the evidence for involvement of pyridoxal-5 -phosphate in the enzyme-catalysed reaction is indirect. Nutritional studies on S.faecalis have shown that this microorganism has a growth requirement for D-alanine, and that... [Pg.688]

Folate was discovered as a growth substance for microorganisms. The situation is complicated by the fact that some organisms require only one component of the molecule, e.g. p-aminobenzoate, and other organisms need the entire folate molecule or even N-formyltetrahydrofolate (= folinate or citrovorum factor, named after Leuconostoc citrovorum). [Pg.382]

Glutamine was first implicated in the growth requirements of microorganisms when it was identified as the active labile substance present in a variety of sources, which was required for growth of certain strains of hemolytic streptocci on a deficient medium (242). [Pg.146]

The two patents described above were particularly important in the initiation of the developments of biodesulfurization catalysts. The bioreactor arrays required for operation and growth method constituted key elements in the following developments of the area, which would condition viability and successful path to industrialization. A sulfur bioavailability assay was incorporated into the screen for monitoring the sulfur uptake by the microorganisms, and the concept formed a claim in the patents [67,91], The objective... [Pg.334]

ATP and magnesium were required for the activation of acetate. Acetylations were inhibited by mercuric chloride suggesting an SH group was involved in the reaction either on the enzyme or, like lipoic acid, as a cofactor. Experiments from Lipmann s laboratory then demonstrated that a relatively heat-stable coenzyme was needed—a coenzyme for acetylation—coenzyme A (1945). The thiol-dependence appeared to be associated with the coenzyme. There was also a strong correlation between active coenzyme preparations and the presence in them of pantothenic acid—a widely distributed molecule which was a growth factor for some microorganisms and which, by 1942-1943, had been shown to be required for the oxidation of pyruvate. [Pg.78]

A particular feature of phytoremediation is its suitability for the removal of common gaseous pollutants, such as CO2, NO2, CO and O3, which is difficult to achieve by physical methods. Since CO2 is a nutritional requirement for plant growth, elevated levels are favourable. Up to 10% of assimilated nitrogen is provided by the uptake of NO2 in certain plant species (Morikawa at el. 1999). CO is metabolized mainly by microorganisms, but to some extent also by plants (Orcutt and Nilsen 2000). Finally, O3 is taken up and removed from the environment by certain plants which have a high capacity to scavenge hydroxyl radicals, and these are the species commonly recommended for cultivation in urban areas, where this pollutant is common. [Pg.81]


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