Abstract:
Methylotrophic micro-organisms are cultivated in known manner on the carbon substrate, methanol, using continuous measuring and secondary feeding processes in order to restrict the methanol concentration to very low values. According to the invention, a cultivation method comprising a plurality of cultivation stages is carried out in agitated and aerated bioreactors, the average methanol concentration decreasing from one stage to the next owing to suitable feeding methods. To that end, the methanol fed in during the cultivation stage (k-2) is proportional to the alkaline solution added in metered amounts during the regulation of the pH, in the cultivation stage (k-1), as the specific dosage, and in the final cultivation stage (k) first as the specific and then as the pO2-regulated dosage. This method prevents an accumulation of toxic intermediates and avoids the need to measure and regulate the methanol concentration during the entire cultivation period, such that costs are considerably reduced, in particular when the method is applied on an industrial scale.
Abstract:
The present invention is directed to methods and media for the growth, enrichment, isolation, and presumptive identification of enteric pathogens such as E. coli 0157:H7 and Salmonella. In particular, the organisms commonly associated with gastrointestinal infections of humans and other animals are distinguished based on their growth, colonial morphology and color. The present invention is also directed to methods and media for the growth, enrichment, isolation and presumptive identification of enteric pathogens such as E. coli 0157:H7 and Salmonella isolated from food, water, dairy, and environmental samples.
Abstract:
Carboxylic acids and glycerine are made by a continuous splitting process which involves the formation of a presplitting mixture by separately adding the glyceride, and effective lipase in an amount sufficient to produce partial splitting of the glyceride, and water. The water used in the formation of the presplitting mixture is water that has been separated from the glycerine-water effluent stream from the pressure splitter and recycled. The next step involves the pressure splitting which entails mixing the partially split glyceride from the presplitter with water and heating under conditions of temperature and pressure effective to substantially complete the splitting of the glyceride into component fatty acids and a glycerine-water stream. The water is then separated from the glycerine-water stream and the water is recycled to the presplitter.
Abstract:
Methods using in vitro processes are disclosed for inducing or enhancing expression of enteric bacterial antigens or virulence factors. The methods, therefore, produce antigenically enhanced enteric bacteria. Also methods for using the antigenically enhanced bacteria are also disclosed, as well as vaccines containing the enteric bacteria. Specifically, a whole enteric bacteria or components thereof are provided by Helicobacter species. Also there are other enteric bacteria which are useful for the disclosed invention. One type, Campylobacter jejuni is graphically depicted wherein the results of high-performance liquid chromatography of monosaccharides from surface extract hydrolysates of C. jejuni are shown.
Abstract:
A microbial fertilizer that constitutes a symbiotic association of several recombinant microbial species is described. The fertilizer contains four streptomyces strains (5 and 8) and two yeast strains (H4 (1) and H7 (3)). The streptomyces strains include a nitrogen fixing strain, a phosphorus decomposer, a potassium decomposer and a coal waste decomposer. The yeast strains produce growth factors and energy required by the streptomyces.
Abstract:
A method of bleaching pulp using a microbe SKB-1152 strain, which is a lignin-decomposing bacterium having a high lignin-decomposing activity and a high activity of high-temperature pulp bleaching, or a product of culturing the microbe. The above method can be performed by the conventional biobleaching process without the necessity for employing special culture conditions. This strain can be obtained from a declorated zone formed in the medium prepared by inoculating a sample strain in a medium containing lignin and/or pulp wherein lignin remains.
Abstract:
Microbial biomass cells wherein at least one metal cationic species is attached to the surface of said cells in an amount sufficient to render the said cells effective to bind anions thereto, and wherein at least one anionic species is also bound to the surface of said cells. The invention also provides a method of making microbial biomass cells as claimed in any preceding claims which comprises: providing biomass cells within a culture medium, removing said cells from said medium and washing them, suspending the cells in a buffer medium, adding a quantity of the required cationic species in aqueous solution optionally to saturation of the binding sites therefor on the cell wall, adding a quantity of the required anionic species in aqueous solution optionally to saturation of the binding sites therefor on the cell wall, removing the treated biomass and washing, and drying the cells to form a solid product. A digestible, mineral-containing composition is also provided which contains biomass cells. For environmental clean-up applications there is also provided a method of reducing the concentration of at least one anionic species in an aqueous composition containing said species, which comprises bringing said aqueous composition into intimate contact with microbial biomass cells, to which at least one metal cationic species has been bound in a quantity sufficient to render said biomass cells receptive to bind said at least one anionic species, and optionally causing the said biomass cells to become regenerated with the same or different metal cationic species after anionic species have become bound to said biomass.
Abstract:
Human neurotumor cells capable of being grown in culture and having a specific high-affinity glutamate/aspartate transport system are provided. Further, is a clonal derivation cell line SH-EP having a flat epithelial morphology and has a specific high-affinity Glutamate/Aspartate transport system. Methods are provided for deriving the SH-EP cells and for using SH-EP cells to detect agonists and antagonists for a glutamate/aspartate transport system. The transport and pharmacological characteristics of this cell line are described.
Abstract:
Novel bacterial isolates of B. thuringiensis are having enhanced toxicity with respect to previously resistant or insufficiently susceptible insect species, including, but not limited to, Plutella xylostella, Spodoptera frugiperda and Spodoptera exigua, as well as certain secondary pests such as Trichoplusia ni. Such isolates may be characterized by their possession of a particular subset of the genes coding for the various B. thuringiensis delta -endotoxin proteins and by a characteristic plasmid profile, or array, known to be associated therewith. Also disclosed are a method for the efficient identification of such bacterial isolates utilizing generalized or, alternatively, gene-specific DNA probes; cloned or synthesized nucleotide sequences which are useful in the preparation of those probes; compositions containing an insecticidally effective amount of a bacterial isolate of the invention in combination with an acceptable carrier; and a method for the use thereof in the control or eradication of insect pests.
Abstract:
A fused protein for use in an enzyme immunoassay system. The protein comprises an enzymatically active beta -galactosidase fused, at its C terminus, to an immunologically active peptide. The protein is produced using a plasmid containing a complete beta -galactosidase gene fused, at its 3' end, with an oligonucleotide coding for the peptide. The fused protein is designed for use in a solid-phase enzyme immunoassay system, based on immunospecific binding of the fused protein to a solid support, or in a homogeneous enzyme immunoassay system, based on enzyme inhibition resulting from immunospecific binding of an antibody to the protein.