1,721,058 research outputs found
Patologia Sinusale Jatrogena. Approccio terapeutico
No full textL’ “incidente” sinuso-antrale in corso di procedure endodontiche, chirurgia exo-dontica od implantare rappresenta una temibile evenienza, che ha come substrato anatomico gli intimi rapporti di vicinanza, e talora di continuità, tra il settore alveolo-dentale premolare-molare superiore ed il seno mascellare. Inadeguata valutazione diagnostica ed errori di tecnica costituiscono le principali cause riportate in letteratura. Denominatore comune è la penetrazione endosinusale di “corpi estranei” ed il realizzarsi di Comunicazioni Oro-Antrali, basi fisiopatologiche per l’instaurarsi di processi flogistici sinusali, che talora evolvono in polisinusiti etmoido-mascellari o nei più gravi quadri di pansinusite. Tali situazioni richiedono un trattamento adeguato e tempestivo. Gli AA riportano la loro esperienza in 12 casi di patologia sinusale iatrogena, 7 soggetti di sesso maschile e 5 di sesso femminile, di età com-presa tra 37 e 53 anni. I pazienti sono pervenuti alla osservazione per complicanza sinusale dopo essere stati sottoposti in altra sede a terapia estrattiva (3 casi) ed endodonzia (7 casi) di molari sup.; 2 pazienti a chirurgia implantare. In tutti i casi erano presenti i segni clinici di una sinusite mascellare e si rilevava C.O.A.. Lo studio radiologico eseguito documentava la presenza endosinusale di residui apico-radicolari, materiali endodontici, impianti; sinusite mascellare in 8 casi, polisinusite etmoido-mascellare (3 casi), pansinusite (1 caso). I pazienti sono stati sottoposti ad intervento chirurgico con approccio di Caldwell-Luc mod. (riscontro transetmoidale con controapertura meatale), per il trattamento della patologia sinusale e la rimozione dei materiali penetrati nel seno; chiusura della C.O.A., mediante allestimento di lembi di rotazione palatali (7 casi), lembi di scorrimento vestibolari (3 casi),combinati (2 casi). Il follow-up ha mostrato in tutti i casi la risoluzione della patologia con restitutio ad integrum stabile nel tempo. Il risultato è da attribuire alla chiusura della comunicazione ed al contestua- le ed adeguato trattamento “open” della patologia flogistica sinusale
Divergencia citogenética y regulación del ciclo celular en poblaciones naturales de hedeoma multiflora Benth (Lamiaceae): más allá del número cromosómico
No full textPosterHedeoma multiflora es una especie aromática medicinal con amplia distribución en Argentina.
La variación cromosómica en poblaciones naturales refleja procesos evolutivos adaptativos, donde la regulación del ciclo celular controla tanto la proliferación como el desarrollo vegetativo.
Este estudio investiga la relación entre variación citogenética y características fenotípicas en poblaciones naturales de H. multiflora, evaluando si representan estrategias adaptativas diferenciadas.Instituto de Recursos BiológicosFil: Peralta, Patricia Angelica. Universidad de Morón. Escuela Superior de Ciencias Exactas y Naturales; Argentina. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; ArgentinaFil: Marcucci, C. Universidad de Morón. Escuela Superior de Ciencias Exactas y Naturales; Argentina.Fil: Baruzzi, G. Universidad de Morón. Escuela Superior de Ciencias Exactas y Naturales; Argentina
Occurrence of actinosporean stages (Myxozoa) in the Nera River system (Umbria, central Italy)
No full textWe investigate the oligochaetes populations in the Nera River systems (central Italy) in order to highlight the occurrence of actinosporean stages in this natural environment. The survey was carried out during 2 years of monitoring 24 stations upstream and downstream the 12 trout farm along the rivers. In four of the 24 sites, oligochaetes releasing Echinactinomyxon and Aurantiactinomyxon types spore were collected. The actinospores
observed were described morphologically, by transmission
electron microscopy and by molecular analysis. Histological
observations of the infected oligochaetes were carried
out. A single morphotype of the collective group Echinactinomyxon
were detected showing the presence of branches
at the distal end of the caudal processes. The morphological
and morphometrical characters showed that the Echinactinomyxon
type herein described is a novel phenotype. This
data has to be confirmed by the molecular comparison with
sequences not yet available in GenBank. The molecular
analysis of the Aurantiactinomyxon type, showed high
genetic similarity (99.8%) with the two alternate stages of
Chloromyxum truttae even if our type showed some
differences in morphology stressing the importance of
combining the two methods to avoid misidentifications.
This is the first survey carried out in natural environment in
Italy. Further analyses on fish population are required in
order to detect myxosporean stage in the vertebrate hosts
and confirm the molecular data
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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