1,721,042 research outputs found
Serum pepsinogen I levels and HLA-B22: A genetic association in a subgroup of duodenal ulcer patients
No full textTargeted phenolic profile of radler beers by HPLC-ESI-MS/MS: the added value of hesperidin to beer antioxidants
Full text linkThe well-known health beneficial properties of beer are mainly due to phenolic antioxidants. Citrus-flavored beers represent a growing side-market in the beer industry, sparingly investigated to date. The phenolic profile of commercial radler beers (R1, R2) was investigated to evaluate the impact of the lemon juice added to beer in the industrial production. Results were compared to those obtained for opportunely chosen commercial beer (B) and lemonade (L). The study was carried out by an HPLC-MS/MS with an electrospray ionization source in selected ion recording mode, analyzing in a single chromatographic run 26 compounds belonging to the different phenolic classes of hydroxybenzoic, hydroxycinnamic and caffeoylquinic acids, flavonoids and prenylflavonoids. Different phenolic profiles were found for R1 and R2, mainly ascribed to different malt/hop/recipe used for the beer. High to very high level of hesperidin were found in the radlers, so that a major impact on phenolic antioxidants of the radlers was due to the lemon. Similarly, a major impact of the lemon aromas was found, D-limonene being the dominant peak resulting from the GC-MS analysis of the volatile fraction of the radlers. Graphical Abstract: [Figure not available: see fulltext.]
Planck constraints on cross-correlations between anisotropic cosmic birefringence and CMB polarization
Full text linkCosmic Birefringence (CB) is the in-vacuo rotation of the linear polarization direction of photons during propagation, caused by parity-violating extensions of Maxwell electromagnetism. We build low resolution CB angle maps using Planck Legacy and NPIPE products and provide for the first time estimates of the cross-correlation spectra CLαE and CLαB between the CB and the CMB polarization fields. We also provide updated CB auto-correlation spectra CLαα as well as the cross-correlation CLαT with the CMB temperature field. We report constraints by defining the scale-invariant amplitudes AαX ≡ L(L + 1)CLαX /2π, where X = α, T, E, B, finding no evidence of CB. In particular, we find AαE = (-7.8 ± 5.6) nK deg and AαB = (0.3 ± 4.0) nK deg at 68% C.L.
Alkynes as building blocks, intermediates and products in the electrochemical procedures since 2000
Full text linkElectrochemical procedures present a selective and environmentally friendly approach for fine chemicals preparation. The use of electricity instead of classical chemical reagents is economical and ecologically attractive. In fact, electricity from renewable resources can be used for electrochemical transformations with highly sustainable and desirable electrochemical applications. Alkynes triple C−C bond has a key role in many chemical transformations, and a growing attention has been recently paid to its electrochemical reactivity. The use of alkynes as building blocks or intermediates or products in electrochemical synthesis is presented in this minireview
Electrogenerated NHCs in organic synthesis: ionic liquids vs organic solvents effects
No full textIn the last twenty years, N-heterocyclic carbenes (NHCs) have been extensively studied for their application as organocatalysts in stereoselective synthesis as well as ligands for transition metals-promoted synthetic methodologies. Derived mainly from azolium salts, NHCs have demonstrated exceptional versatility in their generation usually performed by deprotonation or reduction (chemical or electrochemical). In particular, the generation of NHC under electrochemical conditions, starting from azolium-based ionic liquids, has proven to be a successful green approach and demonstrated wide applicability in organic synthesis. In this Personal Account, the application of electrogenerated NHCs in organic synthesis will be discussed, with a particular attention to the different reactivity in ionic liquids compared to classical organic solvents
Relazione tra deficit di forza in fase acuta e sviluppo di spasticità all’arto superiore nell’ictus cerebrale
No full textDai risultati ottenuti si evidenzia come il riscontro di una migliore prestazione motoria in fase acuta di ictus cerebrale correli significativamente con un minore sviluppo di ipertonia muscolare a carico dei diversi distretti articolari dell’arto superiore ad un anno di distanza dall’evento ictale. Da un esame della letteratura emerge come bassi punteggi ottenuti alle scale di valutazione per l’outcome motorio in fase acuta di ictus si associno ad una maggiore probabilità di sviluppare spasticità nelle fasi successive di malattia3,4,8. Nel presente studio sono stati utilizzati per la valutazione clinica i sub-items relativi all’arto superiore dell’ESS in cui, a differenza delle scale di valutazione utilizzate in precedenti studi3,4 viene richiesta al paziente l’esecuzione attiva di compiti semplici, quali l’elevazione di spalla, l’estensione attiva di polso ed il gesto di “pinza”. Tali movimenti possono essere facilmente esaminati dal clinico, entrando così a far parte della metodica di valutazione quotidiana insieme ad altri segni predittivi del recupero motorio dell’arto superiore, quale per esempio l’estensione attiva delle dita10. È importante sottolineare come la presenza di spasticità a carico di un particolare distretto articolare si associ in modo significativo allo sviluppo di ipertono a carico delle altre articolazioni del medesimo arto. A tale proposito emerge dalla letteratura che la presenza delle sinergie di movimento (descritte da Brunnstrom), nel primo periodo di malattia, correla con la presenza di spasticità e conseguentemente con la disabilità dei pazienti affetti da esiti di ictus cerebrale9. È quindi fondamentale possedere degli strumenti di valutazione clinica in grado di individuare in modo affidabile i soggetti che più facilmente andranno incontro allo sviluppo di spasticità al fine di definire ed instaurare precocemente un percorso riabilitativo che comprenda trattamenti mirati sia di tipo farmacologico che fisioterapico. Il presente studio ha evidenziato come la presenza di un deficit stenico riscontrato all’arto superiore entro una settimana dall’ictus correli significativamente con lo sviluppo di ipertonia muscolare a distanza di un anno. È possibile proporre l’elevazione di spalla, l’estensione attiva del polso ed il gesto di “pinza” della mano come dei validi indici predittivi di sviluppo della spasticità all’arto superiore nel paziente in fase acuta di ictus. Ulteriori studi su campioni più ampi di soggetti sono necessari per giungere a conclusioni più certe
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
