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  • 1
    Electronic Resource
    Electronic Resource
    The accelerating effect of aLactococcus lactis subsp.lactis lactose-utilization/proteinase-deficient strain on proteolysis and flavour development (1996)
    Springer
    European food research and technology 203 (1996), S. 77-81 
    Details
    ISSN: 1438-2385
    Keywords: Lactococci ; Proteolysis ; Flavour development ; Cheese-curd slurries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract This study describes the accelerating effect exerted on proteolysis and flavour development in cheese-curd slurries by combined application ofLactococcus lactis subsp.lactis IFPL359 and high concentrations of its Lac− Prt− derivative, (i.e. that which has reduced capacity to metabolize lactose and reduced proteolytic activity, strain T1). Cells of strain T1 partially lysed by either sonication or incubation with lysozyme, were also used to ascertain how proteolysis was affected by release of intracellular enzymes in the initial stage of incubation of the strains in cheese-curd slurries. The presence of strain T1 produced higher levels of non-protein nitrogen (NPN) and amine nitrogen (AN) during the first weeks of incubation when partially lysed cells had been added. Addition of whole cells of strain T1 produced higher values of NPN and AN at the end of incubation of slurries, accelerating proteolysis by about 2 weeks with respect to the control, which only contained the parental strain IFPL359. At the end of the experimental period higher amino acid levels were detected by HPLC in the slurry containing whole T1 cells. Volatile fractions of the different cheese-curd slurries were also analysed. The higher level of proteolysis produced by addition of high levels of strain T1 appeared to be related to release of intracellular enzymes by this strain owing to its greater capacity for autolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01267774
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  • 2
    Electronic Resource
    Electronic Resource
    MEPSIM: A computational package for analysis and comparison of molecular electrostatic potentials (1993)
    Springer
    Journal of computer aided molecular design 7 (1993), S. 337-347 
    Details
    ISSN: 1573-4951
    Keywords: Molecular electrostatic potential ; Computational chemistry software ; Molecular alignment ; Molecular similarity ; Spearman coefficient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary MEPSIM is a computational system which allows an integrated computation, analysis, and comparison of molecular electrostatic potential (MEP) distributions. It includes several modules. Module MEPPLA supplies MEP values for the points of a grid defined on a plane which is specified by a set of three points. The results of this program can easily be converted into MEP maps using third-parties graphical software. Module MEPMIN allows to find automatically the MEP minima of a molecular system. It supplies the cartesian coordinates of these minima, their values, and all the geometrical relationships between them (distances, angles, and dihedral angles). Module MEPCOMP computes a similarity coefficient between the MEP distributions of two molecules and finds their relative position that maximizes the similarity. Module MEPCONF performs the same process as MEPCOMP, considering not only the relative position of both molecules but also a conformational degree of freedom of one of them. The most recently developed module, MEPPAR, is another modification of MEPCOMP in order to compute the MEP similarity between two molecules, but only taking into account a particular plane. The latter module is particularly useful to compare MEP distributions generated by π systems of aromatic rings. MEPSIM can use several wavefunction computation approaches to obtain MEP distributions. MEPSIM has a menu type interface to simplify the following tasks: creation of input files from output files of external programs (GAUSSIAN and AMPAC/MOPAC), setting the parameters for the current computation, and submitting jobs to the batch queues of the computer. MEPSIM has been coded in FORTRAN and its current version runs on VMS/VAX computers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00125507
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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