1,721,022 research outputs found
«La cetra sua gli porse...»: studi offerti ad Andrea Comboni dagli allievi
No full textIl volume contiene nove studi offerti dagli allievi ad Andrea Comboni in occasione dei suoi primi vent’anni di insegnamento. Essi riguardano alcuni versanti della nostra storia letteraria: la ricerca delle tradizioni sommerse (la cerva bianca, Tessa); l’edizione e la riflessione teorica sull’edizione; l’attenzione per la materialità della nostra letteratura (le stampe, i manoscritti) e per i suoi aspetti più tecnici e misurabili (la metrica, la musica); i procedimenti di rielaborazione, i casi di riuso, i rifacimenti; le correnti esterne al mainstream della storia della letteratura (gli autori radicati nelle tradizioni locali); l’applicazione della letteratura a fini didattici e l’affermazione del suo valore formativo
The Multiple Facets of Oxalate Dianion in Photochemistry
Full text linkOxalate salts are cheap and available reagents used in organic photochemistry as C1-synthons, single-electron transfer (SET) reductants, and hole scavengers. Relying on these multiple roles, a critical comparison of recent applications provides a roadmap to the diverse reductive functionalizations, highlighting the unmet challenges and the future developments
Chronic intractable lumbosacral radicular pain, is there a remedy? Pulsed radiofrequency treatment and volumetric modifications of the lumbar dorsal root ganglia
No full textPurpose Evaluation of clinical and radiological effects of the therapeutic outcome of CT-guided pulsed radiofrequency (PRF)
treatment adjacent to the lumbar dorsal root ganglion (DRG) for patients with chronic intractable lumbosacral radicular pain
in a single-center prospective longitudinal study in order to evaluate predictive factors of safety and therapeutic success.
Materials and methods Thirty patients, from 2016 to 2018, were enrolled (age: 42–80 aa, 66.7% men and 33.3% females)
with low back pain, lumbosciatalgia and/or lumbocruralgia, resistant to previous medical and physical treatments for a period
not < 3 months, failure of surgical and chemiodiscolysis with ozone oxygen therapy. Each patient was subjected to a clinical
evaluation (antalgic walking, sensitive deficit, interviews with specific questionnaires: ODI, RDQ,VAS) and to a radiological
evaluation with MRI examination, before and 30 days after the CT-guided PRF treatment. Measurements of the thickness
of the involved and not involved DRG were taken using common postprocessing software of MRI examinations in order to
have measurement parameters for comparison. We analyzed the clinical course using the paired samples T test in order to
evaluate modification for each clinical and radiological parameter (statistical significance p < 0.05).
Results Significant improvements of the clinical outcomes with a good resolution of the pain symptoms (VAS evaluation: The
score fell from 68.47 to 39.17 with a difference of 29.3 and a reduction of the 42.79% in the perceived pain, p = 0.00000152).
The thickness of DRG falls from an average media of 0.586–0.448 cm (p = 0.000085), with a difference of 0.138 cm and a
percentage reduction of 22.30%.
Conclusions PRF treatment of the DRG may be considered for patients with chronic severe lumbosacral radicular pain
refractory to conventional medical management when other noninvasive or surgical procedures fail. It is minimally invasive,
inexpensive and simple to perform with no complications
Exploiting the Different Nucleophilicity of the Isocyano Group: A Strategy for the Isocyanide Functionalization
No full textBy exploiting the different nucleophilicity of aromatic and aliphatic isocyanides, we selectively react aliphatic isocyano groups while preserving aromatic ones in Passerini and Ugi multicomponent reactions. This simple approach allows the synthesis of alpha-acyloxy carboxamides or alpha-acylamino carboxamides possessing one or two isocyanide groups, which are challenging to achieve through traditional formylation and dehydration protocols. These analogues have the potential to serve as valuable building blocks with diverse applications
Each Interruption is an Opportunity: Novel Synthetic Strategies Explored Through Interrupted Click Reactions
No full textThe particular and unique mechanism of the copper-catalyzed reaction between azides and alkynes (CuAAC) has not only allowed for the efficient synthesis of 1,2,3-trisubstituted 1,4-triazoles in excellent yields and under mild conditions, becoming the quintessential click reaction, but it has also enabled the straightforward formation of a metallocycle intermediate, the copper triazolyl. This, under suitable reaction conditions able to suppress its protonolysis, can be used either for the creation of new bicyclic triazolyl structures or for the generation of novel three or four-component reactions. The aim of this review is to rationalize and unify all these transformations, which are collectively referred to as "interrupted click reactions".The copper-catalyzed reaction between azides and alkynes, known as CuAAC, has allowed for the efficient synthesis of 1,2,3-trisubstituted 1,4-triazoles and the formation of a metallocycle intermediate. This intermediate can be used for creating new structures or generating multi-component reactions, collectively referred to as "interrupted click reactions" imag
Un copista per passione e la riscrittura creativa di un canzoniere: studio del ms. Bart.45 (Udine, Biblioteca Bartoliniana)
No full textIl saggio presenta uno studio completo del manoscritto 45 della biblioteca Bartoliniana di Udine: un insolito esempio di antologia-canzoniere nella quale le tessere di poesie altrui vengono riutilizzate e spesso modificate per dar vita a un nuovo organismo testuale. Accanto al riconoscimento degli autori delle poesie contenute e della probabile fonte dalla quale sono stata tratte, il contributo presenta in edizioni critica i testi poetici rimasti anonimi
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
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