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Esercizi di Algebra Lineare
No full textQuesto volume raccoglie una serie di esercizi, sia svolti che proposti, che puo`risultare utile non solo agli studenti dei corsi di Laurea e di Diploma in Matematica e Ingegneria, ma anche a tutti coloro che desiderano affrontare argomenti di Algebra Lineare. In Appendice si e`presentata una selezione di temi scritti, proposti nelle sessioni d'esame dei corsi di Geometria presso le Facolta`di Scienze ed Ingegneria dell'Universita`di Modena
Analisi biomeccanica sulle superfici per il gioco del calcio in erba artificiale e analisi statistica del questionario FIFA-UEFA relativo alle valutazioni dei giocatori
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Rapid Shotgun Proteomic Liquid Chromatography-Electrospray Ionization-Tandem Mass Spectrometry-Based Method for the Lupin (Lupinus albus L.) Multi-allergen Determination in Foods
No full textAllergy to lupin is a growing food safety problem because this legume, increasingly exploited in the food industry, is one of the allergens that, according to law, must be declared on the labels of food products in the European Union. In this context, a rapid targeted proteomic approach based on liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) analysis was proposed and aimed to unequivocal confirmation and reliable determination of the major lupin allergens, i.e., conglutins, in pasta and biscuits. Detected concentrations were around 1 mg of lupin/kg of pasta and biscuits, proving the capabilities of the MS-based method in terms of the sensitive allergen screening method. Good precision was observed in terms of both intra-and interday repeatability, with relative standard deviation (RSD) lower than 23%. Recoveries from 95 +/- 10 to 118 +/- 12% and from 103 +/- 1 to 110 +/- 12% ranges were calculated for biscuits and pasta, respectively. Finally, the applicability of the devised method was investigated by analyzing market samples containing lupin and samples that may possibly contain traces of lupin deriving from cross-contamination between products and production lines
Substance P self-aggregation revised: a chromatographic and mass spectrometry analysis
No full textSize exclusion liquid chromatography and electrospray ionization mass spectrometry have been used for the
first time to analyze the possible effect of the environmental conditions on substance P (Arg-Pro-Lys-Pro-Gln-Gln-
Phe-Phe-Gly-Leu-Met-NH2) self-association. The effects of different parameters such as solvent ionic strength,
pH and polarity have been evaluated by monitoring the changes observed in aggregation forms registered by
size exclusion chromatography. Mass spectrometry has been employed with the aim of identifying the size of the
aggregation clusters formed in gaseous state. These two techniques can be considered complementary since
they allow describing the same phenomena by different points of view permitting to identify the possible role of
environmental parameters in controlling the distribution of different sized aggregates. Thus, new details can be
added to the previous results reported by other methods.
The results obtained indicate that substance P was associated under all conditions tested and that very limited
variations of the conditions under which substance P was solubilized were accompanied by perceptible changes in
the aggregation figures.
Together with existing data, the data obtained have been interpreted in terms of a bi- or multi-stage model
according to which an initial stepwise aggregation taking place through successive additions of single molecules
is followed by the coalescence of the already-formed aggregates into larger complexes. Such a model appears to
be able to explain the large variations in SP aggregation figures, and the high sensitivity of these figures to limited
modifications of environmental parameters indicated by the data obtained
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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