1,721,050 research outputs found
Contrasti e convivenze lungo la Salaria
No full textNella valle del Tronto, spazi e popolazioni rinnovano relazioni responsabili di mutare continuamente i caratteri di riconoscibilità del territorio. I quartieri produttivi di fondovalle, gli insediamenti residenziali lungo la Salaria, le piastre della logistica, gli sviluppi incrementali lungo le strade provinciali di crinale sono alcuni dei modi con cui l’uomo ha mediato il suo rapporto con il territorio. In questi contesti, la varietà e l’eterogeneità di pratiche e usi ci restituiscono volti diversi della città contemporanea. La ricerca ha provato a costruire un profilo di questo territorio, nel tentativo di farne emergere i suoi tratti fisici riconoscibili, gli ordini spaziali fondanti e le più rappresentative dinamiche socio-economiche
Walking the shrinkage. 21 parole chiave e 5 temi per descrivere la contrazione in cammino
Full text linkIl libro indaga alcune questioni legate alla pianificazione dei territori in contrazione
attraverso la presentazione degli esiti delle ricerche condotte in occasione della Summer
School RecycLand: camminare nei territori in contrazione (29 agosto - 6 settembre
2021). L’attività ha visto 20 studentesse e studenti di diverse provenienze geografiche
e disciplinari camminare da Biella a Torino, con il proposito di osservare e descrivere le
dinamiche di contrazione, dismissione e i processi di mutamento, gli usi temporanei e le
rioccupazioni incrementali degli spazi del lavoro nel biellese e nell’eporediese.
Il volume è articolato in tre parti. La prima parte offre un glossario di 21 parole chiave
legato ai due temi portanti della Summer School, la contrazione e il camminare. Il
proposito dei piccoli saggi che compongono questa parte è quello di restituire al lettore
un terreno di riflessioni utili a ragionare sulle implicazioni spaziali della contrazione
e sui risvolti metodologici del camminare quale preciso punto di vista attraverso il
quale osservare e rintracciare i segni dello svuotamento e della dismissione nei territori
contemporanei. La seconda parte offre un saggio fotografico di Daniele Cinciripini
e Serena Marchionni realizzato durante la Summer School, che intende descrivere
il paesaggio attraversato come palinsesto, evocandone lo stato potenziale. La terza ed
ultima parte presenta una panoramica delle ricerche condotte dalle studentesse e dagli
studenti partecipanti all’attività formativa attraverso una selezione dei materiali inclusi
negli elaborati finali, introdotti da brevi saggi di inquadramento scritti dai tutor che
hanno seguito il lavoro dei gruppi
Development and Longevity: Cellular and Molecular Determinants - A Mini-Review
Full text linkAcross species, development and longevity are tightly linked. We discuss the relevant literature and suggest that the root for this stringent relationship is the rate of development. The basis for the relationship between rate of development and longevity lies in adaptations that have occurred through evolution at multiple levels of biological complexity: organism, organ, cellular, and molecular. Thus, the analysis of the relationship is of interest for multiple fields of biology
Temporaneità
No full textIl saggio riflette sul tema della Temporaneità considerata, ormai, prassi strettamente connessa a quello dell’urban shrinkage, condizione centrale nel dibattito scientifico quanto nell’agenda politica di diverse città europee. Dagli anni ’90 a livello globale, nelle città e nei territori abbondano i luoghi dell’abbandono e dell’inutilizzato che ci restituiscono uno scenario di progressiva contrazione non solo demografica ma anche economica e sociale. In questo controverso quadro di mutazione strutturale delle città e dei territori si stanno sperimentando strategie, strumenti e schemi di governance efficaci per governare la decrescita e l’abbandono il cui comun denominatore è il ricorso all’uso temporaneo. Tale modalità d’uso dello spazio è diventato un vero e proprio trend urbano rivestendo, contestualmente, sempre più centralità tanto nel dibattito scientifico quanto in quello politico, traducendosi in innumerevoli pratiche che stanno ridisegnando i paesaggi dell’abbandono. Tali esperienze possono essere considerate occasioni per ridefinire gli immaginari urbani? O per sperimentare nuove forme di produzione di pubblico e restituire centralità alle comunità locali nei processi di riconversione e trasformazione urbana? Il saggio si propone di dare una risposta a tali quesiti.The essay reflects on the theme of Temporariness considered a practice closely related to that of urban shrinkage, a central condition to the scientific debate and into the political agenda of several European cities. Since the 1990s globally, places of abandonment have abounded in cities, returning us to a scenario of progressive shrinkage not only demographic but also economic and social. In this controversial framework of structural mutation of cities and territories effective strategies, tools and governance schemes are being experimented with to govern degrowth and abandonment whose common denominator is the recourse to temporary use. This mode of space use has become a real urban trend, contextually holding increasing centrality in both scientific and political debate, translating into countless practices that are reshaping the landscapes of abandonment. Can such experiences be considered opportunities to redefine urban imaginaries? Or to experiment with new forms of public production and to restore centrality to local communities in processes of urban redevelopment and transformation? The essay aims to provide an answer to these questions
Shoshonite and sub-alkaline magmas from an ultrapotassic volcano: Sr-Nd-Pb isotope data on the Roccamonfina volcanic rocks, Roman Magmatic Province, Southern Italy
No full textThe Roccamonfina Volcano is characterised by a two stage volcanic activity, divided by volcano-
tectonic collapses. Ultrapotassic leucite-bearing rocks are confined in the pre-caldera stage and display
geochemical characteristics very similar to those of other volcanoes of the Roman Province. Shoshonitic
rocks have been poured out from cinder cones and domes both within the caldera and on the external flanks
of the pre-caldera Roccamonfina volcano. On the basis of new trace element and Sr-Nd-Pb isotope data,
Roccamonfina shoshonitic rocks show differences with respect to shoshonites from Northern Roman
Province, and recall closely those of the Neapolitan volcanoes. Eventually, in the very last phases of
volcanic activity, sub-alkaline magmas are found both as enclaves in trachytic domes, and as final lavas
vented by a fracture within the Monte Santa Croce dome. Ultrapotassic rocks that built up the pre-caldera
composite volcano are plagioclase-bearing leucitites and, similarly to other Roman Provinces volcanoes, have by high levels of incompatible trace elements with an orogenic signature having troughs at Ba, Ta, Nb,
Ta, and Ti, and peaks at Cs, K, Th, U, and Pb. Initial values of 87Sr/86Sr range from 0.709261 to 0.709987,
of 143Nd/144Nd range from 0.512134 to 512195, of 206Pb/204Pb range from 18.788 to 18.851, of
207Pb/204Pb range from 15.685 to 15.701, and of 208Pb/204Pb range from 39.048 to 39.076. Shoshonites
show a larger differentiation degree but, as a whole, lower levels of incompatible trace elements with similar
pattern of incompatible trace element contents with respect to earlier ultrapotassic leucite-bearing rocks. On
the other hand, shoshonitic rocks have Sr, Nd, and Pb isotopes consistently different than pre-caldera
ultrapotassic leucite-bearing rocks. 87Sr/86Sr ranges from 0.706604 to 0.708332, 143Nd/144Nd ranges
from 0.512179 to 0.512382, 206Pb/204Pb ranges from 18.838 to 19.153, 207Pb/204Pb ranges from 15.661
to 15.694, and 208Pb/204Pb ranges from 38.999 to 39.212. High-K calc-alkaline samples have intermediate
isotopic values between ultrapotassic plagioclase leucitites and shoshonites, but the lowest levels of
incompatible trace element contents. The genesis of this uncommon association is investigated in details. It
is argued that ultrapotassic magmas have been generated in a modified lithospheric mantle after crustal-
derived metasomatism. Interaction between metasomatic agent and lithospheric upper mantle produced a
low-melting metasomatised veined network. Pure partial melting of vein mineralogy produced pre-caldera
leucite-bearing ultrapotassic magmas. Leucite-free magmas have been generated further melting, at higher
temperature, of the same meltasomatic mantle previously depleted by the ectraction of ultrapotassic rocks.
We suggest that a key role in this second episode of melting is played by little but significant addition of
astenospheric upper mantle material from foreland mantle, flowing through the corner of the Ionian present
day subducted slab during its roll-bac
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
The effectiveness of systemic antibiotic prophylaxis in preventing local complications after tooth extraction. A systematic review.
No full textAbstract
PURPOSE:
To assess the beneficial or harmful effects of systemic prophylactic antibiotics at extraction of teeth, apart from third molars, vs no antibiotic or placebo administration. Furthermore, if antibiotics are beneficial, to determine which type, dosage, duration and timing of administration is the most effective.
MATERIALS AND METHODS:
The Cochrane Oral Health Group's Trials Register (to 30 January 2016) and MEDLINE (1 January 1950 to 30 January 2016) were searched. There were no language or date restrictions placed on the searches of the electronic databases. Randomised controlled trials (RCTs) of parallel group design, with a follow-up of at least 2 weeks, comparing the administration of various prophylactic antibiotic regimens vs no antibiotics to people undergoing extraction of teeth, not including third molars, were included. Outcome measures were postoperative complications/adverse events, post-operative pain and swelling. Screening of eligible studies, assessment of the risk of bias of the trials and data extraction were conducted in triplicate by three independent review authors. Results were to be expressed as risk ratios (RRs) using a random-effects model for dichotomous outcomes, with 95% confidence intervals (CIs). Heterogeneity, including both clinical and methodological factors, was to be investigated.
RESULTS:
No relevant RCT was identified.
CONCLUSIONS:
There is no RCT to determine if the antibiotic therapy is needed at extraction of teeth, excluding third molars. Properly designed and conducted RCTs are needed to understand the role of the antibiotic therapy for tooth extraction. Conflict-of-interest statement: This systematic review was self-funded and the authors have no conflict of interests to declare
Brain RNA synthesis, long-term potentiation and depression at the perforant path-granule cell synapse in the guinea pig
No full textDati preliminari sulle reazioni immunologiche indotte dal gel di PVP
No full textSono state studiate le modificazioni immunitarie indotte dal polivinilpirrolidone in pazienti portatrici da almeno due anni di protesi mammarie contenenti tale sostanza come gel.; si à valutata la composizione delle sottopopolazioni linfocitarie, l’attivazione e la proliferazione dei linfociti e l’attività delle cellule natural killer. Sembrerebbe che, pur essendo il PVP in grado di indurre un’attivazione immunitaria paragonabile a quella indotta dal silicone, in realtà tale attivazione non si verifichi, forse a causa della rapida eliminazione della sostanza, eventualmente presente nel torrente circolatorio, per via renal
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