Results 241 to 250 of about 55,884 (262)

Genetics of Proteolysis in Lactococcus lactis

2003
Genetic and biochemical research over the past 15 years on milk protein degradation by Lactococcus lactis has resulted in a detailed picture of how casein is broken down into its sub-fragments and used for cellular growth. Starting with the action of an extracellular but cell-wall-located proteinase, milk protein is degraded into oligopeptides that are
Jan Kok, Girbe Buist
openaire   +2 more sources

Fermented soymilk with a monoculture of Lactococcus lactis

International Journal of Food Microbiology, 2003
Lactococcus lactis strain (LL3) isolated from mothers' milk was used to produce fermented soymilk. The strain survived at levels of over 7 log cfu/ml for 3 weeks in the fermented soymilk. A consumer survey was carried out to compare the acceptability of the fermented product with a similar product made with L.
Hely Tuorila, Shea Beasley, Per E. J. Saris   +2 more
openaire   +3 more sources

Restriction-modification systems in lactococcus lactis

Gene, 1995
Several restriction-modification (R-M) systems have been identified in Lactococcus lactis. Most of the systems have been plasmid encoded and function as phage-resistance mechanisms. At least five different type-II R-M systems, LlaAI, LlaBI, LlaCI, LlaDI and LlaEI, were identified in isolates from a mixed Cheddar starter culture.
Niels Randel Nyengaard, Finn K. Vogensen, Jytte Josephsen   +2 more
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Heterologous Protein Expression by Lactococcus lactis

2011
This chapter describes the use of Lactococcus lactis as a safe and efficient cell factory to produce heterologous proteins of medical interest. The relevance of the use of this lactic acid bacterium (LAB) is that it is a noncolonizing, nonpathogenic microorganism that can be delivered in vivo at a mucosal level. The use of strains of L.
Oscar P. Kuipers, Julio Villatoro-Hernandez, Roberto Montes-de-Oca-Luna, Odila Saucedo-Cárdenas   +3 more
openaire   +4 more sources

Dynamics of pyruvate metabolism in Lactococcus lactis

Biotechnology and Bioengineering, 2001
AbstractThe pyruvate metabolism in the lactic acid bacterium Lactococcus lactis was studied in anaerobic cultures under transient conditions. During growth of L. lactis in continuous culture at high dilution rate, homolactic product formation was observed, i.e., lactate was produced as the major end product.
Claus Rix Melchiorsen, Niels Bang Siemsen Jensen, Kirsten Væver Jokumsen, John Villadsen, Bjarke Bak Christensen   +4 more
openaire   +3 more sources

Microencapsulation of Lactococcus lactis subsp. cremoris

Journal of Microencapsulation, 1994
Lactococcus lactis subsp. cremoris was microencapsulated within alginate/poly-L-lysine (alg/PLL), nylon or crosslinked polyethyleneimine (PEI) membranes. Toxic effects were observed with solvents and reagents used in nylon and PEI membrane formation. Alg/PLL encapsulation resulted in viable and active cell preparations which acidified milk at a rate ...
B. C. Larisch, Denis Poncelet, Ronald J. Neufeld, Claude P. Champagne   +3 more
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Regulation of carbon catabolism in Lactococcus lactis

2000
The Lactococcus lactis IL1403 is a lactose negative, plasmid free strain. Nevertheless, it is able to hydrolyze lactose in the presence of cellobiose.In this work we describe identification of a gene involved in this process. The gene was found to be homologous to the sugar catabolism regulator, ccpA.
Jan Kok, Magdalena Kowalczyk, T Aleksandrzak, Jacek Bardowski   +3 more
openaire   +3 more sources

Optimization of Nisin Production by Lactococcus lactis

2002
The production of nisin by batch culture of Lactococcus lactis ATCC 11454 in MRS broth (pH 6.5), as treated in 30 assays, that were set up by a fractional factorial design of two levels (2[4-1]), was improved. The minimum and maximum concentrations of sucrose (5.0-12.5 g/L), asparagine (7.5-75 g/L), potassium phosphate (6.0-18.0 g/L), and Tween-80 (1.0-
Thereza Christina Vessoni Penna, Dante Augusto Moraes   +1 more
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Bacteriocins Produced By Lactococcus Lactis Strains [PDF]

, 1994
The ability of some lactococci to produce inhibitory substances other than organic acids has been known for quite some time. These substances include the well-known bacteriocins nisin (Hurst, 1981; Rayman & Hurst, 1984) and diplococcin (Davey & Pearce, 1982), the lactostrepcins (Kozak et al., 1978) and lactococcins (Van Belkum et al., 1989, 1991, 1992)
openaire   +2 more sources

Membrane Protein Expression in Lactococcus lactis

2015
The Gram-positive bacterium Lactococcus lactis has many properties that are ideal for the overproduction of membrane proteins in a functional form. Growth of lactococci is rapid, proceeds to high cell densities, and does not require aeration, which facilitates large-scale fermentation.
Martin S. King, Christoph Boes, Edmund R.S. Kunji   +2 more
openaire   +3 more sources