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Cosimo Pallavicini 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1982,175(4):249-252
Summary Changes in peptides and their amino-acid composition that take place during the plastein reaction carried out with immobilized-chymotrypsin as a catalyst and with the low-molecular weight peptide fraction of alfalfa (Medicago sativa) leaf protein hydrolyzate as substrate were studied. By thin-layer fingerprint chromatography the substrate and the plastein reaction product exhibited five and six peptide species, respectively. The analysis of their amino-acid composition indicated that the substrate peptides in two cases gave rise to plastein peptides by slight apparent compositional changes, in the other cases instead they underwent more pronounced modifications.
This work was supported by the Consiglio Nazionale delle Ricerche, Roma, Italy 相似文献
Veränderungen einiger Peptide aus Luzerneblattproteinen als Ergebnis einer Plastein-Reaktion mit immobilisiertem -Chymotrypsin
Zusammenfassung Es wurden Veränderungen der Peptide und deren Aminosäuren-Zusammensetzung im Laufe der Plastein-Reaktion erforscht, die mit Hilfe von als Katalysator wirkenden immobilisiertem -Chymotrypsin und einer Peptid-Fraktion mit niedrigem Molekulargewicht aus einem Hydrolysat von Luzerneproteinen (Medicago sativa) als Substrat durchgeführt wurde. Durch Dünnschichtfingerabdruck-Chromatographie zeigten Substrat und Produkt der Plastein-Reaktion fünf bzw. sechs Peptide. Die Analysen ihrer Aminosäuren-Zusammensetzung zeigte in zwei Fällen, daß die Substratpeptide in Plasteinpeptide übergingen, bei scheinbar geringen Veränderungen in der Zusammensetzung. In den übrigen Fällen ergaben sich tiefgreifendere Veränderungen.
This work was supported by the Consiglio Nazionale delle Ricerche, Roma, Italy 相似文献
3.
Francesco Merola Simonetta Grilli Sara Coppola Veronica Vespini Sergio De Nicola Pasquale Maddalena Cosimo Carfagna Pietro Ferraro 《Advanced functional materials》2012,22(15):3267-3272
Investigation on the behavior of nematic liquid crystals on functionalized polar dielectric crystal substrates is accomplished. Very interesting effects can be observed in maneuvering liquid crystal droplets on the substrate surface, driven by electric fields generated by pyroelectric effect. Reversible drops fragmentation and self‐assembling in different configurations can be achieved. The dynamics of the observed phenomena is studied and the repeatability of the process is full assessed. 相似文献
4.
Modern cloud data centers rely on server consolidation (the allocation of several virtual machines on the same physical host) to minimize their costs. Choosing the right consolidation level (how many and which virtual machines are assigned to a physical server) is a challenging problem, because contemporary multitier cloud applications must meet service level agreements in face of highly dynamic, nonstationary, and bursty workloads. In this paper, we deal with the problem of achieving the best consolidation level that can be attained without violating application service level agreements. We tackle this problem by devising fuzzy controller for consolidation and QoS (FC2Q), a resource management framework exploiting feedback fuzzy logic control, that is able to dynamically adapt the physical CPU capacity allocated to the tiers of an application in order to precisely match the needs induced by the intensity of its current workload. We implement FC2Q on a real testbed and use this implementation to demonstrate its ability of meeting the aforementioned goals by means of a thorough experimental evaluation, carried out with real‐world cloud applications and workloads. Furthermore, we compare the performance achieved by FC2Q against those attained by existing state‐of‐the‐art alternative solutions, and we show that FC2Q works better than them in all the considered experimental scenarios. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
5.
A computer running under a Unix operating system is an excellent host on which to develop software for target systems which have the same type of microprocessor as the host computer. Unfortunately, facilities for preparing executable modules able to be sent to an EPROM programmer or to be loaded onto a RAM portion of target memory space are lacking in standard Unix. These facilities can be improved in any version of Unix without the need for expensive software using the set of commands presented in this paper. 相似文献
6.
This paper describes the energy consumption performance of sea-going ships engaged in the EU27 seaborne trades based on data and parameters resulting from the EX-TREMIS (EXploring non road TRansport EMISsions in Europe) database. EX-TREMIS is a comprehensive database of fleet and transport activity data, specific energy consumption, emission factors and total emissions from rail, maritime and air transport in the European Union. The EX-TREMIS maritime model derives from a mixture of top–down and bottom–up approaches for estimating pollutant emissions from shipping activities. The model did not use direct observations of actual trips, but empirically derived the number of equivalent-ships. Cargo type shipments were linked to seven ship type categories for which a further segmentation by ship size (three length classes), type and age of the main engine and type of fuel was applied. 相似文献
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High genetic variability in non-aflatoxigenic A. flavus strains by using Quadruplex PCR-based assay 总被引:1,自引:0,他引:1
Aflatoxigenic Aspergillus flavus isolates always show, by using a multiplex PCR-system, four DNA fragments specific for aflR, nor-1, ver-1, and omt-A genes. Non-aflatoxigenic A. flavus strains give variable DNA banding pattern lacking one, two, three or four of these genes. Recently, it has been found and reported that some aflatoxin non-producing A. flavus strains show a complete set of genes. Because less is known about the incidence of structural genes aflR, nor-1, ver-1 and omt-A in aflatoxin non-producing strains of A. flavus, we decided to study the frequencies of the aflatoxin structural genes in non-aflatoxigenic A. flavus strains isolated from food and feed commodities. The results can be summarized as following: 36.5% of the examined non-aflatoxigenic A. flavus strains showed DNA fragments that correspond to the complete set of genes (quadruplet pattern) as found in aflatoxigenic A. flavus. Forty three strains (32%) showed three DNA banding patterns grouped in four profiles where nor-1, ver-1 and omt-A was the most frequent profile. Twenty five (18.7%) of non-aflatoxigenic A. flavus strains yielded two DNA banding pattern whereas sixteen (12%) of the strains showed one DNA banding pattern. In one strain, isolated from poultry feed, no DNA bands were found. The nor-1 gene was the most representative between the four aflatoxin structural assayed genes. Lower incidence was found for aflR gene. Our data show a high level of genetic variability among non-aflatoxigenic A. flavus isolates that require greater attention in order to design molecular experiment to distinguish true aflatoxigenic from non-aflatoxigenic A. flavus strains. 相似文献
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De Santis R Ambrogi V Carfagna C Ambrosio L Nicolais L 《Journal of materials science. Materials in medicine》2006,17(12):1219-1226
Microencapsulated paraffin based phase change material (PCM) have been incorporated into Poly(methyl-methacrylate) (PMMA)
matrix in order to enhance the thermo-mechanical properties. Calorimetric and mechanical analyses are carried out and the
thermo regulating potential of PMMA/PCM composites is investigated. Results indicate that the PCM phase has a negligible effect
on the glass transition temperature of the PMMA matrix, and the thermal regulating capability spans around body temperature
absorbing or releasing a thermal energy up to 30 J/g. One of the effect of the PCM phase into the cement is the reduction
of the peak temperature developed during the exothermal reaction. 相似文献