Representation of Nelson Algebras by Rough Sets Determined by Quasiorders

In this paper, we show that every quasiorder $R$ induces a Nelson algebra $\mathbb{RS}$ such that the underlying rough set lattice $RS$ is algebraic. We note that $\mathbb{RS}$ is a three-valued {\L}ukasiewicz algebra if and only if $R$ is an equivalence. Our main result says that if $\mathbb{A}$ is a Nelson algebra defined on an algebraic lattice, then there exists a set $U$ and a quasiorder $R$ on $U$ such that $\mathbb{A} \cong \mathbb{RS}$.Comment: 16 page

Chemical abundances of Seyfert 2 AGNs, II: N2 metallicity calibration based on SDSS

We present a semi-empirical calibration between the metallicity (Z) of Seyfert 2 active galactic nuclei and the N2 = log([N II]λ6584/H a) emission-line intensity ratio. This calibration was derived through the [OIII]λ5007/[O II]λ3727 versus N2 diagram containing observational data and photoionization model results obtained with the CLOUDY code. The observational sample consists of 463 confirmed Seyfert 2 nuclei (redshift z ≤ 0.4) taken from the Sloan Digital Sky Survey DR7 data set. The obtained Z-N2 relation is valid for the range 0.3 ≤ (Z/Z⊙) ≤ 2.0 that corresponds to -0.7 ≤ (N2) ≤ 0.6. The effects of varying the ionization parameter (U), electron density and the slope of the spectral energy distribution on the Z estimations are of the order of the uncertainty produced by the error measurements of N2. This result indicates the large reliability of our Z -N2 calibration. A relation between U and the [OIII]/[O II] line ratio, almost independent of other nebular parameter, was obtained.Fil: Carvalho, S.P.. Universidade Do Vale Do Paraiba; BrasilFil: Dors, O. L.. Universidade Do Vale Do Paraiba; BrasilFil: Cardaci, Monica Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Hägele, Guillermo Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Krabbe, Nora Cristina. Universidade Do Vale Do Paraiba; BrasilFil: Pérez Montero, E.. Instituto de Astrofísica de Andalucía; EspañaFil: Monteiro, A.F.. Universidade Do Vale Do Paraiba; BrasilFil: Armah, M.. Universidade Do Vale Do Paraiba; BrasilFil: Freitas Lemes, P.. Universidade Do Vale Do Paraiba; Brasi

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

Prevalence and risk factors for bovine leptospirosis in Mato Grosso do Sul, Brazil

Foi investigada a prevalência de anticorpos antileptospira em fêmeas bovinas com idade igual ou superior a 24 meses, provenientes de 178 rebanhos de 22 municípios do estado de Mato Grosso do Sul, bem como identificados fatores de risco associados à infecção. Foram analisadas 2.573 amostras de soro sangüíneo por meio do teste de soroaglutinação microscópica perante 10 sorovares de leptospira. Títulos iguais ou superiores a 100 para um ou mais sorovares foram detectados em 1.801 fêmeas (98,8%) de 161 (96,5%) rebanhos. O sorovar Hardjo (65,6%) foi apontado como o mais provável, seguido do sorovar Wolffi (12,3%). Os resultados demonstram que a leptospirose bovina se encontra presente em todos os municípios estudados, com alta prevalência, tanto em animais como em rebanhos. Os fatores de risco identificados neste estudo e associados à infecção por bactérias do gênero lepstopira foram o tipo de exploração pecuária de corte e a raça Zebu. _____________________________________________________________________________________________________________ ABSTRACTThe prevalence of anti-Leptospira spp. antibodies was estimated for female cattle aged 24 months or older. The sample comprised 178 herds from 22 counties in the state of Mato Grosso do Sul, Brazil. The risk factors associated with the presence of infeccion were investigated. A total of 2,573 blood serum samples were tested against 10 leptospira serovars using the microagglutination test (MAT). Titers of 100 or higher for one or more serovars were detected in 1,801 females (98.8%) from 161 herds (96.5%). Serovar Hardjo (65.6%) was the most frequent, followed by serovar Wolffi (12.3%). These results suggest that bovine leptospirosis is widespread in all the counties under study, with a high prevalence both at the animal and the herd level. Beef farms and the Zebu breed were associated to the higher risk of herd infection by leptospiras