Tori embedded in S³ with dense asymptotic lines

In this paper are given examples of tori T² embedded in S³ with all their asymptotic lines dense.

Evaluation of capillaries with different inner coatings for DNA analysis using dilute polymer solutions by capillary electrophoresis

In this work three capillary columns, one with uncoated inner wall and two with covalently-bound internal coatings - poly(vinyl alcohol) (PVA) and poly(dimethylacrylamide) (PDMA) - both covalently covered - were used to separate DNA fragments and compared to DNA separation using replaceable polymer solutions. The separations were performed using hydroxyethylcellulose (HEC) (90-105 kDa) in concentrations ranging from 0.00 to 2.00% m/v. The results indicated that the separation efficiency was higher in the PVA capillary than in the PDMA in all evaluated concentrations of HEC. In addition, higher resolution was also observed in PVA-coated capillary since in PDMA the shape of the peaks was not reproducible when subsequent runs were performed. Contrary to what has previously been reported in the literature, no reasonable separation was possible in bare fused silica.

Qualidade da água para consumo humano e concentração de fluoreto

O artigo visa analisar a concentração de fluoreto na água para consumo humano, considerando o balanço entre benefícios e riscos à saúde, e produzir subsídios para atualização da legislação brasileira. Estudos de revisão sistemática, documentos oficiais e dados meteorológicos foram examinados. As temperaturas nas capitais brasileiras indicam que o fluoreto deveria variar de 0,6 a 0,9 mg/L para prevenir cárie dentária. Concentração de fluoreto natural de 1,5 mg/L é tolerável para consumo no Brasil se não houver tecnologia de custo-benefício aceitável para ajuste/remoção do seu excesso. A ingestão diária de água com fluoreto em concentração > 0,9 mg/L representa risco à dentição em menores de oito anos de idade e os consumidores deveriam ser expressamente informados desse risco. Considerando a expansão do programa nacional de fluoretação da água para regiões de clima tipicamente tropical, deve-se revisar a Portaria 635/75, relacionada ao fluoreto adicionado às águas de abastecimento público.

Biomarkers of oxidative stress and endothelial dysfunction in glucose intolerance and diabetes mellitus

Objectives: To evaluate biomarkers of endothelial dysfunction and oxidative stress in glucose intolerance (GI) compared to overt diabetes (DM2). Design and methods: 140 volunteers including 96 with DM2, 32 with GI and 12 controls (C) were Studied. NO metabolites, NO synthase inhibitors. thiols and N-acetyl-beta-glucosaminidase (NAGase) activity were analyzed by chemiluminescence, capillary electrophoresis, ELISA and colorimetric assay, respectively. Results: (center dot)NO metabolites were higher in GI (NOx: P=0.03 S-nitrosothiols: p=0.001) and DM2 (p=0.006; p=0.0006) groups in relation to group C, while nitrotyrosine was higher only in the DM2 group in comparison 10 the other groups. NAGase activity was elevated in GI (p=0.003) and DM2 (p=0.0004) groups in relation to group C, as well as, ADMA (p=0.01: p=0.003) and GSSG (p=0.01 p=0.002). Conclusions: (center dot)NO metabolites. (center dot)NO synthase inhibitors. thiols and NAGase are biomarkers Suitable to indicate endothelial dysfunction and oxidative stress in the early stages of impaired response to insulin. (c) 2008 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved.