1,466 research outputs found
Imaging in bone sarcomas. the chemotherapist's point of view
No full textThe role of imaging in planning oncologic treatment and follow-up of patients with bone sarcomas is dis-cussed in the present article. Tumor staging and radiographic assessment of response to chemotherapy inbone sarcomas may be of difficult interpretation. In particular, the use of the criterion of tumor shrinkageto measure response to chemotherapy is not always applicable in bone tumors where higher calcificationrather than reduction in size is frequently observed. New techniques such as (18)F-FDG PET/CT, dynamiccontrast-enhanced computed tomography or magnetic resonance are now available allowing a moreaccurate staging of patients and adding information for the evaluation of tumor response. Innovativeapproaches aiming to evaluate vascular and metabolic response rather than mono- or bi-dimensionalchanges may be more informative and require further investigations. © 2011 Elsevier Ireland Ltd. All rights reserved
Dimer-dimer stacking interactions are important for nucleic acid binding by the archaeal chromatin protein Alba
No full textArchaea use a variety of small basic proteins to package their DNA. One of the most widespread and highly conserved is the Alba (Sso10b) protein. Alba interacts with both DNA and RNA in vitro, and we show in the present study that it binds more tightly to dsDNA (double-stranded DNA) than to either ssDNA (single-stranded DNA) or RNA. The Alba protein is dimeric in solution, and forms distinct ordered complexes with DNA that have been visualized by electron microscopy studies; these studies suggest that, on binding dsDNA, the protein forms extended helical protein fibres. An end-to-end association of consecutive Alba dimers is suggested by the presence of a dimer-dimer interface in crystal structures of Alba from several species, and by the strong conservation of the interface residues, centred on Are and Phe(60). In the present study we map perturbation of the polypeptide backbone of Alba upon binding to DNA and RNA by NMR, and demonstrate the central role of Phe(60) in forming the dimer dimer interface. Site-directed spin labelling and pulsed ESR are used to confirm that an end-to-end, dimer dimer interaction forms in the presence of dsDNA.Peer reviewe
First person – Alba Delrio-Lorenzo
No full textFirst Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Alba Delrio-Lorenzo is first author on ‘Sarcoplasmic reticulum Ca2+ decreases with age and correlates with the decline in muscle function in Drosophila’, published in JCS. Alba is a PhD student in the lab of Javier García-Sancho and María Teresa Alonso at the Instituto de Biología y Genética Molecular (IBGM), University of Valladolid, Spain, investigating the molecular mechanisms implicated in aging, particularly muscle aging.Peer reviewe
The Author/Translator Interactional Process. A Case Study
No full textSee Naples and Kill (1988) is a lively and colourful novel by the con-temporary English writer, Gregory Dowling, translated into Italian in 2015.
Following the tradition of translation studies (Venuti 2000, Bass-nett 2002, Cronin 2006), this paper analyses the rewriting process of literary translation, considering in particular the fruitful but sometimes tense and even conflictual relationship between writer and translator.
The translation of the novel See Naples and Kill was an ongoing rewriting process entailing a constant dialogue between the writer and the translator. Therefore, the study aims at answering two main ques-tions: what happens if the rewriting process of translation is constant-ly questioned by the author? What happens if the author has a good mastery of the target language and s/he is her/himself a translator?
By exploring the relationship between translation and re-creation, the research focuses on the differences and similarities between the primary creation (source text) and the secondary creation (target text), and aims to verify in which way the dialogic encounter of two different personalities and cultures does not make them merge but, by retaining their own uniqueness, leads eventually to their mutually en-riching each other. A comparative analysis of the source text and the different drafts of the translated version accompanied by the author’s comments will shed light on the tense author-translator relationship in the specific case under investigation and how both actors handle this tension in order to create a new work resulting from the (dis)agreement of the two parties
Neoadjuvant chemotherapy for osteosarcoma of the extremities in preadolescent patients: The rizzoli institute experience
No full textMedical records of 133 patients, 10 years old or younger with primary high-grade nonmetastatic osteosarcoma of the extremities treated at the Rizzoli Institute between 1983 and 1999 with neoadjuvant chemotherapy were reviewed and compared with those of 782 patients aged 11 to 40 years treated in the same period with the same chemotherapy protocols. In comparison to the older group, the younger group had more females, more patients with normal lactic dehydrogenase levels, and more non-limb-salvage procedures (amputation or rotationplasty). Five-year event-free and overall survivals were essentially the same in the two groups (63% and 71% vs. 60% and 70%) as were the patients rescued after relapse and presently event-free (18% vs. 20%). The authors conclude that there does not seem to be any indication to treat preadolescent primary high-grade nonmetastatic osteosarcoma patients by alternative and/or more aggressive therapies. © 2008 Lippincott Williams & Wilkins
Chemotherapy-related toxicity in patients with non-metastatic Ewing sarcoma: influence of sex and age
No full textInfluence of age and sex on chemotherapy-related toxicity was evaluated in children (3-9 years), adolescents (10-17 years), and adults (up to 40 years) with localized Ewing sarcoma (ES) enrolled in the ISG/SSG III protocol. Treatment was based on vincristine, doxorubicin, cyclophosphamide, ifosfamide, dactinomycin, and etoposide. High-dose chemotherapy with busulfan and melphalan was given in poor responder patients. The analysis was based on 2191 courses of standard chemotherapy and 230 patients. A lower risk of G4 leukopenia and thrombocytopenia, hospitalization, febrile neutropenia, and red blood cell (RBC) transfusions was observed in males. Use of granulocyte colony-stimulating factor (G-CSF) was more frequent in adults, while children more often received RBC transfusions. A significant correlation between sex and chemotherapy-related toxicity was observed in the study, whereas no significant differences in terms of bone marrow toxicity can be expected according to patient age. Further studies should analyse the role of pharmacokinetics, pharmacogenomics, and clinical characteristics. © 2014 Edizioni Scientifiche per l'Informazione su Farmaci e Terapia
Periosteal osteosarcoma: a single-institution experience.
No full textBackground: Periosteal osteosarcoma is a rare variant of osteosarcoma. Wide surgical removal is the mainstay of treatment, but controversy remains about the role of chemotherapy. The objective of this study was to review and analyze the clinical and treatment-related factors that influence the survival of patients with periosteal osteosarcoma who received treatment in a single institution. Methods: Thirty-three patients with periosteal osteosarcoma (19 males and 14 females) with a median age of 16 years (range, ages 6-32 years) underwent surgery (32 patients) and received radiotherapy (1 patient). Chemotherapy was received according to different regimens for high-grade osteosarcoma by 14 patients who had grade 3 tumors. Results: The 10-year overall survival rate was 84%. The only patient who did not undergo surgery died of disease after 9 months; for the remaining 32 patients the 10-year disease-free survival rate was 65%. Survival was not influenced by the receipt of chemotherapy. The patients who received chemotherapy had a 10-year overall survival rate of 86%, and those who received only local treatment had an overall survival rate of 83% (P =.73). Conclusions: The authors' experience indicated that the treatment of periosteal osteosarcoma requires only wide surgical removal of the tumor and that adjuvant chemotherapy does not improve survival. © 2010 American Cancer Society
A ALBA e a luta pela hegemonia no continente americano: uma topologia do discurso bolivariano
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas. Programa de Pós-graduação em Sociologia PolíticaO objetivo da dissertação é analisar o movimento bolivariano, liderado pela Venezuela, enquanto projeto de construção de uma nova hegemonia na América Latina e o Caribe. Tal projeto se constrói discursivamente em oposição à histórica hegemonia pan-americana liderada pelos Estados Unidos (EUA). Para isso é estudada a ALBA (Aliança Bolivariana para os Povos de nossa América) como organização internacional que facilita a alineação de países e sociedades latino-americanos em relação ao movimento bolivariano, gerando novas modalidades de construção de sentido, assim como novas vias e regras de relacionamento internacional. A pesquisa analisa os discursos de mandatários nas reuniões de Cúpula da ALBA, e, apelando à teoria do discurso de Ernesto Laclau, identifica nesse conjunto os três passos previstos pelo autor na configuração de um desafio hegemônico: (1) o estabelecimento de um antagonismo face ao imperialismo dos EUA que é identificado como o poder hegemônico institucionalizado, e a dicotomização do espaço social americano através da construção de uma fronteira entre esse poder e o resto da comunidade (América Latina e o Caribe); (2) a articulação contingente entre diversas demandas sociais, características da América Latina e do Caribe, cuja insatisfação é atribuída ao imperialismo dos EUA; e (3) a formação de um campo popular, através da expressão positiva dessas demandas numa nova identidade, no caso a identidade bolivariana. A pesquisa conclui que o movimento bolivariano consegue gerar elementos para permitir uma nova lógica de construção de sentido, configurando assim estruturalmente um campo de luta pela hegemonia. Porém, também são destacados vários problemas nessa tarefa, especialmente ligados à identificação de diversas unidades com o bolivarianismo.The dissertation research the Bolivarian Movement, headed by Venezuela, as a new hegemonic project, still under construction, at Latin America and the Caribbean. This hegemonic project is discursively constructed in opposition to the historic Pan American hegemony, led by the U.S. In this way, the Bolivarian Alliance for the Peoples of Our America (ALBA) is approached as an international organization that seeks to align the Latin American countries and societies behind the Bolivarian Movment. The ALBA generates new ways of sense-making, as well as new norms of international relations. The research analyzes the speeches at the ALBA's presidential summits, using the Ernesto Laclau's Discourse Theory, and identifying the three steps proposed by this author to the hegemonic construction: Firstly, the establishment of an antagonism against U.S. imperialism and the dicotomization of the hemispheric social space, through the definition of a boundary between the powerful country and the rest of continental community (Latina America and the Caribe). Secondly, the contingent articulation of a variety of social demands, which dissatisfaction are ascribed to the U.S. imperialism. Thirdly, the formation of a new popular field, through the positive expression on a new identity of this unified set of demands, in this case the Bolivarian identity. The dissertation concludes that the Bolivarian movement manages a new logic of sense-making, and therefore places the hegemonic struggle in a new structural field. However, it also identified some problems on this task, particularly in the difficulty to construct a Bolivarian identity shared by various social unities (countries, societies and social sectors)
Neoadjuvant chemotherapy for radioinduced osteosarcoma of the extremity: The Rizzoli experience in 20 cases
No full textEvaluate treatment and outcome of 20 patients with radioinduced osteosarcoma (RIO). Because of previous primary tumor treatment, RIO protocols were different from others we used for non-RIO. Patients and Methods: Between 1983 and 1998, we treated 20 RIO patients, ages 4-36 years (mean 16 years), with chemotherapy (two cycles before surgery, three postoperatively). The first preoperative cycle consisted of high-dose Methotrexate (HDMTX)/Cisplatinum (CDP)/Adriamycin (ADM) and the second of HDMTX/CDP/Ifosfamide (IFO). The three postoperative treatments were performed with cycles of MTX/CDP; IFO was used as single agent per cycle repeated three times. Results: Two patients received palliative treatment because their osteosarcoma remained unresectable after preoperative chemotherapy. The remaining 18 patients had surgery (7 amputations, 11 resections); histologic response to preoperative chemotherapy was good in 8 patients, poor in 10. At a mean follow-up of 11 years (range, 7-22 years), 9 patients remained continuously disease-free, 10 died from osteosarcoma and 1 died from a third neoplasm (myeloid acute leukemia). These results are not significantly different from those achieved in 754 patients with conventional osteosarcoma treated in the same period with protocols used for conventional treatment. However, this later group had an 18% 3-year event-free survival after treatment of relapse vs. 0% in the RIO group. Conclusion: Treated with neoadjuvant chemotherapy RIO seem to have an outcome that is not significantly different from that of comparable patients with conventional primary high grade osteosarcoma (5-year event-free survival: 40% vs. 60%, p = NS; 5-year overall survival 40% vs. 67%, p < 0.01)
Venezuela tra Alba e Mercosur. Un ruolo ambivalente
No full textGiacomo Pellini, "Venezuela tra Alba e Mercosur", in: Visioni LatinoAmericane, 11 (2014), pp.48-62L’autore esamina l’attivismo di Hugo Châvez nei processi di integrazione latinoamericana soffermandosi in particolare sull’Alba e il Mercosur. Mette a confronto, da una parte, la leadership esercitata dal Venezuela all’interno dell’Alba e dall’altra il ruolo di secondo piano del Venezuela all’interno del Mercosur. Evidenzia come per il Paese sia più vantaggiosa la permanenza, seppur con un ruolo meno incisivo, nel Mercosur che non la leadership nell’Alba. El autor examina el activismo de Hugo Châvez en los procesos de integración en América Latina, con especial énfasis en el Alba y en el Mercosur. Compara, por un lado, el liderazgo ejercido por Venezuela en el Alba y, por el otro, su rol secundario en el Mercosur. Muestra cómo para el Pais sea mâs ventajosa la retención, aunque con un rol de menor importancia, en el Mercosur, respecto al liderazgo en el Alba. The author examines the activism of Hugo Chàvez in the main integration processes in Latin America, Alba and Mercosur. He examines, on one hand, the leadership that Venezuela practices within the Alba and, on the other hand, the secondary role of Venezuela within Mercosur. He explains that for the country is more advantageous to remain inside the Mercosur, despite the secondary role, than to exercise the leadership within the Alba
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