A kinetic approach to homogeneous Ziegler type polymerization. Transient state

In this paper we present a kinetic approach to the analysis of transient-state homogeneous Ziegler-Natta polymerization activity data. The main features of the experimental data are discussed and fitted to transient kinetic models.info:eu-repo/semantics/publishedVersio

Polymerization of ethylene using metallocene and aluminoxane systems

This paper describes ethylene polymerization using a number of metal-locene and aluminoxane catalyst systems, Cp2MR2 and methylaluminoxane [M = Zr, W, Nb; R = Cl, CH3]. Two types of methylaluminoxane, MAO (1) and MAO (2), were used as cocatalysts. The polymerization activities of the complexes Cp2WCl2 and Cp2NbCl2 were compared with that of Cp2ZrCl2. The Nb and W complexes were found to be less active than the Zr complex. Polyethylene characterization was also carried out by the following methods: gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR).info:eu-repo/semantics/publishedVersio

Homogeneous Ziegler-Natta polymerisation: A kinetic approach .2. Transient-state kinetics

An integrated view is presented of several possible mechanisms applicable to the interpretation of homogeneous Ziegler-Natta polymerisation. In this paper, the transient aspects related to the kinetics of Ziegler-Natta polymerisation are investigated. Extensive data are used to construct kinetic profiles (rM vs. t) from a theoretical approach. Special attention is given to the duration of the transient period as a function of the different kinetic parameters. The kinetic models developed are fitted to experimental data, either directly obtained by the authors or published in the literature. These general models have a broad range of application.info:eu-repo/semantics/publishedVersio

Impact of micronutrients supplementation on bone repair around implants: microCT and counter-torque analysis in rats

The use of natural substances and micronutritional approaches has been suggested as a therapeutic alternative to benefit the bone healing associated with no side effects. Nevertheless, the influence of micronutritional interventions with therapeutic propr2414551sem informaçãosem informaçã

Las problemáticas en la diferenciación entre madres e hijas: un estudio de caso

Este trabajo pretende investigar cómo la dinámica psicológica de las relaciones entre madres e hijas, como base de la perspectiva psicoanalítica. Más específicamente, pretendemos comprender los problemas que pueden surgir en una relación altamente indiferenciada entre madre e hija. Por lo tanto, se pretende proporcionar una mejor comprensión de la relación simbiótica con una madre y sus consecuencias para la constitución psíquica de las niñas. A partir de este estudio de caso, se lleva a cabo una discusión en línea con nuestros conceptos teóricos constructivos que diferentes autores del psicoanálisis han realizado sobre el tema de la transmisión de la feminidad entre madres e hijas.       O presente trabalho visa investigar as dinâmicas psicológicas das relações entre mães e filhas, utilizando como base a perspectiva psicanalítica. Mais especificamente, buscou-se compreender as problemáticas existentes quando há um grau elevado de indiferenciação entre a menina e sua mãe. Para isso, realizou-se uma articulação entre um estudo de caso e conceitos da psicanálise que fundamentam as cenas clínicas apresentadas. O estudo de caso concretizou-se a partir de um atendimento psicológico de uma criança que apresentava importantes sofrimentos oriundos de uma dificuldade de separação da figura materna. Assim, pretende-se fornecer uma melhor compreensão a respeito das vicissitudes de uma relação simbiótica com a mãe e as consequências de tal para a constituição da vida psíquica da mulher.This work aims to investigate how the psychological dynamics of relations between mothers and daughters, as a basis the psychoanalytic perspective. More specifically, we intend to comprehend the problems that may emerge in a highly undifferentiated relationship between mother and daughter. Thus, it is intended to provide a better understanding of the symbiotic relationship with a mother and its consequences for the the girls psychic constitution. Departing from this case study, a discussion is carried out in line with our constructive theoretical concepts that different authors of psychoanalysis have made on the subject of the transmission of femininity between mothers and daughters.                                                                                                        &nbsp

A survey for maintenance of virulent newcastle disease virus-free area in poultry production in Brazil

In 2003, Brazil was recognized as a pathogenic Newcastle Disease Virus (NDV) strain-free country for commercial poultry. This research was conducted in Brazil between December 2003 and March 2005 to verify the maintenance of this virulent NDV-free status. Serum samples from 5,455 flocks for commercial poultry farms were collected, comprising 81,825 broiler chickens. The farms were located in nine states of the country, grouped in three geographic regions. Serological evidence of NDV infection was detected in 28.8% of the surveyed farms. However, all fifteen viruses isolated and identified as Newcastle Disease Virus (NDV) were characterized as nonpathogenic strains, based on the Intracerebral Pathogenicity Index. These results showed that Brazil preserves the virulent NDV-free status for commercial flocks.368375Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Prevalence of newcastle disease virus in broiler chickens (Gallus gallus) in Brazil

This study was carried out during 2002/2003, aiming to determine the prevalence of virulent Newcastle disease virus strains (NDV) in Brazilian commercial poultry farms. Clinical samples were obtained from the Southeastern, Southern and Central-Western regions, which comprise the main area of the Brazilian poultry production. Serum samples and tracheal and cloacal swabs of 23,745 broiler chickens from 1,583 flocks, including both vaccinated chickens and those with no vaccination information, were tested for NDV using a diagnostic ELISA kit. The seropositivity was 39.1%, and the isolation percentage by flock varied from 1.0 to 7.6%, and by region from 6.5 to 58.4%. Higher isolation rates (74.3-83.3%) were obtained after three passages in embryonated chicken eggs. All isolates preliminarily identified as NDV were characterized as nonpathogenic strains, as their Intracerebral Pathogenicity Index (ICPI) was below 0.7. Based on results of this study, Brazil can claim a virulent NDV-free status for commercial flocks.349357Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Evaluation Of The Use Of Systemic Antimicrobial Agents By Professionals For The Treatment Of Periodontal Diseases

Aim: To investigate the indication of systemic antimicrobial agents used by dental professionals for treatment of patients affected by periodontal diseases. Methods: Interviews by a questionnaire were held with 225 professionals of different dental specialties and who performed periodontal treatment. Results: Among interviewees, 94% indicated systemic antibiotics as a form of periodontal disease treatment. Their main indication was for periodontal abscesses (80%) followed by aggressive periodontitis (62%) and necrotizing diseases (45%). The most frequently used antibiotics were amoxicillin (81%) and metronidazole (57%). The medications were indicated in association with mechanical therapy by 67% of the professionals. As regards the occasion of indication, 60% indicated systemic antibiotic therapy before and after mechanical periodontal scaling and root planing. Seventy-eight percent of the professionals indicated antibiotics associated with periodontal surgery for access to scaling, and 76% indicated it before and after the surgical procedure. Among the interviewees, 99% took into account systemic involvement for drug administration. Conclusions: It was concluded that a considerable portion of professionals indicate systemic antibiotic-therapy in an incoherent manner and in situations in which there is no indication for antibiotic use, or with ineffective protocols.124285291Herrera, D., Matesanz, P., Bascones-Martínez, A., Sanz, M., Local and systemic antimicrobial therapy in periodontics (2012) J Evid Based Dent Pract., 12, pp. 50-60Matarazzo, F., Figueiredo, L.C., Cruz, S.E., Faveri, M., Feres, M., Clinical and microbiological benefits of systemic metronidazole and amoxicillin in the treatment of smokers with chronic periodontitis: a randomized placebo controlled study (2008) J Clin Periodontol., 35, pp. 885-896Cionca, N., Giannopoulou, C., Ugolotti, G., Mombelli, A., Amoxicillin and metronidazole as an adjunct to full-mouth scaling and root planing of chronic periodontitis (2009) J Periodontol., 80, pp. 364-371Sgolastra, F., Gatto, R., Petrucci, A., Monaco, A., Effectiveness of systemic amoxicillin/metronidazole as adjunctive therapy to scaling and root planing in the treatment of chronic periodontitis: a systematic review and metaanalysis (2012) J Periodontol., 83, pp. 1257-1269Mestnik, M.J., Feres, M., Figueiredo, L.C., Duarte, P.M., Lira, E.A.G., Faveri, M., Short-term benefits of the adjunctive use of metronidazole plus amoxicillin in the microbial profile and in clinical parameters of subjects with generalized aggressive periodontitis (2010) J Clin Periodontol., 37, pp. 353-365Yek, E.C., Citan, S., Topcuoglu, N., Kulekci, G., Issever, H., Kantarci, A., Efficacy of amoxicillin and metronidazole combination for the management of generalized aggressive periodontitis (2010) J Periodontol., 81, pp. 964-974Rodrigues, A.S., Louren, O.D.S., Lima Neto, L.G., Pannuti, C.M., Crespo Hirata, R.D., Hirata, M.H., Clinical and microbiological evaluation, by real-time pcr, of non-surgical treatment of aggressive periodontitis associated with amoxicillin and metronidazole (2012) J Periodontol., 83, pp. 744-752Silva, M.P., Feres, M., Sirotto, T.A., Soares, G.M., Mendes, J.A., Faveri, M., Clinical and microbiological benefits of metronidazole alone or with amoxicillin as adjuncts in the treatment of chronic periodontitis: a randomized placebo-controlled clinical trial (2011) J Clin Periodontol., 38, pp. 828-837Arweiler, N.B., Pietruska, M., Skurska, A., Doliñska, E., Pietruski, J.K., Bläs, M., Nonsurgical treatment of aggressive periodontitis with photodynamic therapy or systemic antibiotics. Three-month results of a randomized, prospective, controlled clinical study (2013) Schweiz Monatsschr Zahnmed., 123, pp. 532-544Silva-Senem, M.X., Heller, D., Varela, V.M., Torres, M.C., Feres-Filho, E.J., Colombo, A.P., Clinical and microbiological effects of systemic antimicrobials combined to an anti-infective mechanical debridement for the management of aggressive periodontitis: a 12-month randomized controlled trial (2013) J Clin Periodontol., 40, pp. 242-251Zandbergen, D., Slot, D.E., Cobb, C.M., Van der Weijden, F.A., The clinical effect of scaling and root planing and the concomitant administration of systemic amoxicillin and metronidazole: a systematic review (2013) J Periodontol., 84, pp. 332-351Haas, A.N., De Castro, G.D., Moreno, T., Susin, C., Albandar, J.M., Oppermann, R.V., Azithromycin as an adjunctive treatment of aggressive periodontitis: 12-months randomized clinical trial (2008) J Clin Periodontol., 35, pp. 696-704Sampaio, E., Rocha, M., Figueiredo, L.C., Faveri, M., Duarte, P.M., Gomes Lira, E.A., Clinical and microbiological effects of azithromycin in the treatment of generalized chronic periodontitis: a randomized placebo-controlled clinical trial (2011) J Clin Periodontol., 38, pp. 838-846Han, B., Emingil, G., Ozdemir, G., Tervahartiala, T., Vural, C., Atilla, G., Azithromycin as an adjunctive treatment of generalized severe chronic periodontitis: clinical, microbiological and biochemical parameters (2012) J Periodontol., 83, pp. 1480-1491Sigusch, B., Beier, M., Klinger, G., Pfister, W., Glockmann, E., A 2-step nonsurgical procedure and systemic antibiotics in the treatment of rapidly progressive periodontitis (2001) J Periodontol., 72, pp. 275-283Pradeep, A.R., Kathariya, R., Clarithromycin, as an adjunct to non-surgical periodontal therapy for chronic periodontitis: A double blinded, placebo controlled, randomized clinical trial (2011) Arch Oral Biol., 56, pp. 1112-1119Cionca, N., Giannopoulou, C., Ugolotti, G., Mombelli, A., Microbiologic testing and outcomes of full-mouth scaling and root planing with or without amoxicillin/metronidazole in chronic periodontitis (2010) J Periodontol., 81, pp. 15-23Colombo, A.P., Teles, R.P., Torres, M.C., Rosalem, W., Mendes, M.C., Souto, R.M., Effects of non-surgical mechanical therapy on the subgingival microbiota of Brazilians with untreated chronic periodontitis: 9-month results (2005) J Periodontol., 76, pp. 778-784Marsh, P.D., Dental plaque: biological significance of a biofilm and community lifestyle (2005) J Clin Periodontol., 32, pp. 7-15Feres, M., Haffajee, A.D., Allard, K., Som, S., Goodson, S., Socransky, S.S., Antibiotic resistance of subgingival species during and after antibiotic therapy (2002) J Clin Periodontol., 29, pp. 724-735Goossens, H., Causal link confirmed between antibiotic use and resistance (2007) Lancet., 369, pp. 482-90Ardila, C.M., Granada, M.I., Guzmán, I.C., Antibiotic resistance of subgingival species in chronic periodontitis patients (2010) J Periodontal Res., 45, pp. 557-563Casati, M.Z., Nociti Junior, F.H., Sallum, E.A., Toledo, S., Sallum, A.W., Evaluation of using antimicrobial agents in the therapy of periodontal diseases (1996) Periodontics., 5, pp. 335-340Herrera, D., Roldan, S., Sanz, M., The periodontal abscess: a review (2000) J Clin Periodontol., 27, pp. 377-386Lypka, M., Hammoudeh, J., Dentoalveolar infections (2011) Oral Maxillofac Surg Clin North Am., 23, pp. 415-424Herrera, D., Roldan, S., O'Connor, A., Sanz, M., The periodontal abscess (II). Short term clinical and microbiological efficacy of 2 systemic antibiotic regimes (2000) J ClinPeriodontol., 27, pp. 395-404Bermejo-Fenoll, A., Sánchez-Pérez, A., Necrotising periodontal diseases (2004) Med Oral Patol Oral Cir Bucal, 9 (SUPPL.), pp. 114-9. , 108-114Haffajee, A.D., Torresyap, G., Socransky, S.S., Clinical changes following four different periodontal therapies for the treatment of chronic periodontitis: 1 year results (2007) J Clin Periodontol., 34, pp. 243-253Albandar, J.M., Adjunctive antibiotics with nonsurgical periodontal therapy improve the clinical outcome of chronic periodontitis in current smokers (2012) J Evid Based Dent Pract., 12, pp. 63-66Mascarenhas, P., Gapski, R., Al-Shammari, K., Hill, R., Soehren, S., Fenno, J.C., Clinical response of azithromycin as an adjunct to non-surgical periodontal therapy in smokers (2005) J Periodontol., 76, pp. 426-436Angaji, M., Gelskey, S., Nogueira-Filho, G., Brothwell, D., A systematic review of clinical efficacy of adjunctive antibiotics in the treatment of smokers with periodontitis (2010) J Periodontol., 81, pp. 1518-1528Herrera, D., Alonso, B., Leon, R., Roldan, S., Sanz, M., Antimicrobial therapy in periodontitis: the use of systemic antimicrobials against the subgingival biofilm (2008) J Clin Periodontol., 35, pp. 45-66Powell, C.A., Mealey, B.L., Deas, D., McDonnell, H.T., Mortiz, A.J., Post-surgical infections: prevalence associated with various periodontal surgical procedures (2005) J Periodontol., 76, pp. 329-333Wilson, W., Taubert, K.A., Gewitz, M., Lockhart, P.B., Baddour, L.M., Levison, M., Prevention of infective endocarditis: guidelines from the American Heart Association (2007) J Am Dent Assoc, 138, pp. 739-745. , A guideline from the American Heart Association Rheumatic Fever, Endocarditis and Kawasaki Disease Committee, Council on Cardiovascular Disease in the Young, and the Council on Clinical Cardiology, Council on Cardiovascular Surgery and Anesthesia, and the Quality of Care and Outcomes Research Interdisciplinary Working Group.747-760Slots, J., Low-cost periodontal therapy (2012) Periodontol. 2000, 60, pp. 110-13