1,721,069 research outputs found
Weil Representation and Metaplectic Groups over an Integral Domain
Full text linkGiven F a locally compact, nondiscrete, non-archimedean field of characteristic ≠ 2 and R an integral domain such that a non-trivial smooth character χ: F → R* exists, we construct the (reduced) metaplectic group attached to χ and R. We show that it is in the expected cases a double cover of the symplectic group over F. Finally, we define a faithful infinite dimensional R-representation of the metaplectic group analogue to the Weil representation in the complex cas
La chemioprevenzione del carcinoma mammario
No full textCol termine chemioprevenzione si indica la somministrazione di sosotanze chimiche (farmaci o costituenti della dieta) in grado di impedire lo sviluppo di unaneoplasia invasiva. Poichè un simile approccio potrebbe contribuire alla riduzione dell'incidenza del carcinoma della mammella, sono state intraprese ricerche volte ad accertarne la applicabilità. Gli interventi dietetici proposti per ridurre il rischio di carcinoma della mammella, a tutt'oggi in fase di valutazione, prevedono soprattutto la restrizione dell'apporto di grassi, mentre, per qwuanto riguarda i farmaci, quelli che hanno finora raggiunto la fase clinica di sperimentazione sono tamoxifen, fenretinide (somministrati singolarmente o in associazione) e raloxifene. L'efficacia del tamoxifen nel prevenire il carcinoma mammario, evidenziata dai risultati preliminari di un grandi trial americano, non ha finora trovato conferma nei primi dati relativi a due studi analoghi condotti in Europa. Complessivamente, la chemioprevenzione del carcinoma mammario, pur non essendo ancora un'opzione disponibile nella pratica medica quotidiana, costituisce un'area di ricerca estremamente promettente, che merita di ricevere attenzione e sforzi crescenti
Outcomes of support groups for carriers of BRCA 1/2 pathogenic variants and their relatives: a systematic review
No full textPeople tested positive for BRCA1/2 face an increased risk of cancer; to help them cope with the genetic information received, support to BRCA1/2 families should be continued after testing. Nonetheless how such support should be provided has not been established yet. As a potentially valuable option is represented by support groups, the aim of this systematic review was to assess studies exploring the outcomes of support groups for BRCA1/2 carriers. This study adhered to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and was registered in the International Prospective Register of Systematic Reviews (PROSPERO) database (CRD42021238416). Peer-reviewed papers published between January 1995 and February 2021 were searched for, using four databases. Among 1586 records identified, 34 papers were reviewed in full-text and eleven were included in the qualitative synthesis of the results. Three themes emerged as major focuses of support groups: risk management decisions, family dynamics and risk communication, and psychosocial functioning. Our findings show that support groups proved helpful in supporting women’s decision-making on risk-reducing options. Moreover, during those interventions, BRCA1/2 carriers had the opportunity to share thoughts and feelings, and felt that mutual support through interacting with other mutation carriers help them release the emotional pressure. However, no significant impact was reported in improving family communication. Overall, a high level of satisfaction and perceived helpfulness was reported for support group. The findings suggest that support groups represent a valuable tool for improving BRCA1/2 families care
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
Genetic counselling as a route to enhanced autonomy: using a sequential mixed methods research approach to develop a theory regarding presymptomatic genetic testing for young adults at risk of inherited cancer syndromes
No full textUndertaking presymptomatic or predictive genetic testing should involve a considered choice. Decisions regarding genetic testing for young adults have to be considered within the context of their key life stage, which may involve developing a career, forming partnerships and/or becoming parents. The aim of this study was to develop a theoretical model regarding the factors involved when young adults (18–30 years) undergo presymptomatic genetic testing for inherited cancer syndromes. The model evolved from synthesis of results of a sequential mixed methods study involving a systematic review, a qualitative study and a quantitative study. The resulting model shows that young adults at risk of inherited cancer syndromes are influenced by others to have testing and come to counselling with their decision already made. However, genetic counselling enhances their feelings of autonomy and integration of their genetic status into their lives. Our theoretical model could be a valid support during the genetic counselling process for young adults and their parents, as it may sensitise professionals to the specific needs of this population, including education and support to autonomous decision-making. Counselling approaches should be modified in this population: an inclusive, multi-step counselling process is needed, with timing and setting set according to the specific features of this sensitive population
Sudden shift to remote genetic counseling during the COVID-19 pandemic: Experiences of genetics professionals in Italy
No full textThe 2020 COVID-19 pandemic has rendered in-person provision of genetic counseling impossible for prolonged periods in many countries, mandating a sudden shift to remote delivery. We used qualitative thematic analysis to explore Italian genetics professionals’ experience with remote genetic counseling. Fourteen group and four individual interviews were conducted after participants had delivered one or more remote sessions via videoconference or on the telephone. Data were coded and grouped under themes. Three main themes were identified as follows: (a) technical and logistical issues, (b) communication issues, and (c) clinical content and outcome of the session. The participants acknowledged that not having to travel to the clinic saves consultands time and expense. They also highlighted that not sharing a physical space with consultands and having to rely on technology can negatively impact on effective communication, building trusting relationships, and performing accurate psychosocial assessments. Regarding the clinical content of sessions, remote genetic counseling was perceived to favor greater focus and succinct, to the point communication. However, participants also felt uncomfortable not being able to use visual aids to support the explanation of complex concepts. Moreover, demographics and the socio-cultural status of consultands emerged as factors influencing the outcome of remote genetic counseling sessions. Finally, participants reported feeling that more experience with this novel approach would improve their confidence and their ability to adapt their counseling skills as appropriate. Based on these findings, we suggest that effective, equitable provision of remote genetic counseling will require an infrastructure that is able to support video counseling, sharing of clinical documents and visual aids, and connect with a wide range of devices. Moreover, the structure of sessions should be tailored to the specific requirements of remote genetic counseling and suitable training efforts should be promoted to enhance professionals’ communication skills
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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