177,688 research outputs found
Light rays having extreme points with the same spatial coordinates
No full textAbstractIn this paper we deal with lightlike geodesics in Lorentzian manifolds which are closed with respect to the spatial coordinates. We consider the case where the initial point is fixed or moves on a level of a given time function. The case where the initial point is free is also considered, under a periodicity condition on the metric
GLI ANTICORPI ANTITIROIDE: UN EPIFENOMENO DELLE AUTOIMMUNOPATIE IN CORSO DI MALATTIA CELIACA. STUDIO DELLA PREVALENZA IN ETA’ PEDIATRICA
No full textAcute effects induced by verbal instructions in the biomechanics of the drop vertical jump performed from different drop heights
No full textOn a Class of Geodesically Connected Lorentzian Manifolds
No full textAbstractIn this paper we study the geodesical connectedness of Lorentzian manifolds. We consider a connected manifold M=M0×R, where M0is a complete Riemannian manifold endowed with a Lorentzian metricgof splitting type. We prove that, under suitable hypotheses on the coefficients of the metricg,Mis geodesically connected
L.) cultivar from Southern Italy
No full textThis paper presents a comprehensive analytical methodology, based on 'in-time' and 'in-space' tandem mass spectrometry (MS) techniques, to identify and quantify flavonoid compounds in a typical Italian sweet cherry cultivar (cv. Ferrovia). Five anthocyanins, four flavan-3-ols and nine flavonols were determined by means of hyphenated high-performance liquid chromatography - multi-stage MS (HPLC-MSn) analyses (MSn up to MS4), among which quercetin-3-O-rutinoside-7-O-glucoside, kaempferol-3-O-rutinoside-7-O-glucoside, quercetin-3-O-galactosyl-rhamnoside and quercetin-3-O-coumaroylglucoside were tentatively identified in sweet cherries for the first time. Ultrafast HPLC and tandem MS (UHPLC-MS/MS) analyses through multiple reaction monitoring experiments showed that cyanidin-3-O-rutinoside and cyanidin-3-O-glucoside were the main anthocyanins of cv. Ferrovia at maturity. Moreover, consistent levels of catechin and epicatechin as well as quercetin-3-O-rutinoside and kaempferol-3-O-rutinoside were also found. Because flavonoids have been ascribed as potential health-promoting compounds, gathered findings provide new insight into the knowledge of the quali-quantitative profile of these phytochemicals into a widespread fruit such as sweet cherry
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Assignment of the TRB@ locus encoding the T-cell receptor beta chain to sheep, cattle, goat and river buffalo chromosomes by in situ hybridization
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