Validade e reprodutibilidade de receptores para o GPS em relação à distância percorrida Validez y reproducibilidad de receptores GPS en relación de la distancia recorrida

ResumenObjetivoEl presente estudio evaluó la validez y reproducibilidad de dos modelos de receptores para el Global Positioning System (GPS). La validez fue evaluada comparando la distancia registrada por los receptores con la distancia conocida de estos trayectos.MétodoSeis jóvenes tenistas (177,6±6,2cm; 76,6±3,2kg) recorrieron tres trayectos: 1) 100m en la pista de atletismo (número de “disparos” = 120); 2) 400m en la pista de atletismo (número de “disparos” = 60) y 3) 100m con cambios de dirección (número de “disparos” = 120), utilizando los equipos Garmin© Forerunner 405 y Polar© RS800.ResultadosEn los trayectos sin cambios de dirección (100 y 400m), a través de la ANOVA two way (distancia y velocidad) no se detectaron diferencias entre la distancia conocida y las distancias registradas por los receptores analizados (p>0,05). En el trayecto de 100m con cambios de dirección, se observaron diferencias entre la distancia conocida y las registradas tanto por el Polar© RS800 como por el Garmin© Forerunner 405 (p<0,05). También se verificó la diferencia en las distancias registradas por el Polar® RS800 y por el Garmin© Forerunner 405 para el trayecto realizado con cambios de dirección (p<0,05).ConclusiónA través de los datos, se puede afirmar que los receptores para GPS evaluados presentaron un nivel aceptable de precisión para distancias recorridas sin cambios de dirección, sin embargo, la precisión de estos equipos en trayectos con cambios de dirección fue limitada.AbstractObjectiveThe present study evaluated the reproducibility and validity of two models of receivers for the Global Positioning System (GPS). Validity was assessed by comparing the distance recorded by the GPS receivers with the known distance.MethodSix young players (177.6±6.2cm; 76.6±3.2kg) performed three routes with different characteristics: 1) 100m in the athletics track (number of “sprints” = 120); 2) 400m in the athletics track (number of “sprints” = 60) and 3) 100m with changes of direction (number of “sprints” = 120), using equipment Garmin© Forerunner 405 and Polar© RS800.ResultsRegarding linear routes (100 and 400m), no differences were detected using ANOVA two-way (distance and speed) between the known distance and distance recorded by GPS receivers analyzed (p>0.05). Regarding non-linear route of, significant differences were observed between the known distance and recorded distance by the GPS receivers (p<0.05). There was also a significant difference between the distance recorded by Polar© RS800 and Garmin© Forerunner 405 for the non-linear route (p<0.05). Analysis of the limits of agreement reinforces the limitation of equipment in relation to accuracy for the non-linear route.ConclusionThese data suggest that the GPS receivers evaluated showed acceptable level of accuracy for linear routes, however, the accuracy of such devices on non-linear routes was limited

Thermal Diffusivity Measurements In Vegetable Oils With Thermal Lens Technique

The thermal lens technique to measure the thermal diffusivity in vegetable oils was discussed. The Amazonian species and olive oils were used as samples. The time resolved spectra were measured using an automatic system and the obtained data were used to solve the thermal property of each oil.741 II697699Gordon, J.P., Leite, R.C.C., Moore, R.S., Porto, S.P.S., Whinery, J.R., (1965) J. Appl. Phys., 36, p. 3Andrade, A.A., Tenorio, E., Catunda, T., Baesso, M.L., Cassanho, A., Jenssen, H.P., (1999) J. Opt. Soc. Am. B, 16, p. 395Baesso, M.L., Bento, A.C., Andrade, A.A., Sampaio, J.A., Pecorato, E., Nunes, L.A.O., Catunda, T., Gama, S., (1998) Phys. Rev. B, 57, p. 10545Brown, S.M., Baesso, M.L., Shen, J., Snook, R.D., (1993) Anal. Chim. Acta, 282, p. 711Bento, A.C., Palangana, A.J., Evangelista, L.R., Baesso, M.L., Pereira, J.R.D., Da Silva, E.C., Mansanares, A.M., (1996) Appl. Phys. Lett., 68, p. 3371Pereira, J.R.D., Mansanares, A.M., Palangana, A.J., Baesso, M.L., (1999) Mol. Cryst. Liq. Cryst. Sci. Technol., Sect. A, 332, p. 3079Shen, J., Love, R.D., Snook, R.D., (1992) Chem. Phys., 165, p. 385Baesso, M.L., Shen, J., Snook, R.D., (1992) Chem. Phys. Lett., 197, p. 25

O157:H7 Shiga Toxin-Producing Escherichia coli Strains Associated with Sporadic Cases of Diarrhea in São Paulo, Brazil

Inst Adolfo Lutz Registro, Sao Paulo, BrazilLab Anal Clin Dr Joao Antonio Vozza, Campinas, SP, BrazilUniv Fed Sao Paulo, Escola Paulista Med, Sao Paulo, BrazilUniv Fed Sao Paulo, Escola Paulista Med, Sao Paulo, BrazilWeb of Scienc

β-Lactam antibiotics and vancomycin inhibit the growth of planktonic and biofilm Candida spp.: An additional benefit of antibiotic-lock therapy?

AbstractThe aim of this study was to evaluate the effects of cefepime, meropenem, piperacillin/tazobactam (TZP) and vancomycin on strains of Candida albicans and Candida tropicalis in planktonic and biofilm forms. Twenty azole-derivative-resistant strains of C. albicans (n=10) and C. tropicalis (n=10) were tested. The susceptibility of planktonic Candida spp. to the antibacterial agents was investigated by broth microdilution. The XTT reduction assay was performed to evaluate the viability of growing and mature biofilms following exposure to these drugs. Minimum inhibitory concentrations (MICs) ranged from 0.5mg/mL to 2mg/mL for cefepime, TZP and vancomycin and from 0.5mg/mL to 1mg/mL for meropenem and the drugs also caused statistically significant reductions in biofilm cellular activity both in growing and mature biofilm. Since all of the tested drugs are commonly used in patients with hospital-acquired infections and in those with catheter-related infections under antibiotic-lock therapy, it may be possible to obtain an additional benefit from antibiotic-lock therapy with these drugs, namely the control of Candida biofilm formation

Emerging Enteropathogenic Escherichia coli Strains?

Escherichia coli strains of nonenteropathogenic serogroups carrying eae but lacking the enteropathogenic E. coli adherence factor plasmid and Shiga toxin DNA probe sequences were isolated from patients (children, adults, and AIDS patients) with and without diarrhea in Brazil. Although diverse in phenotype and genotype, some strains are potentially diarrheagenic

Destacadas de soja (Glycine max (L.) merril absorção de cálcio e fósforo por raízes var. IAC-2)

This paper deals with experiments designed to study the influence of several external factors on the uptake both of Ca+² and H2PO4 - by excised soybean roots. The main conclusions are as follows: 1) Ca uptake does not follow the usual Michaelian kynetics, the evidence suggesting the operation of passive mechanism; 2) R uptake is metabolic, a single mechanism being in operation; 3) pH has a strong effect both on Ca and R absorption; 4) The use both of lower temperature (O0C) and of respiratory poisons (cyanide) inibited phosphate uptake but had no effect on calcium absorption. 5) The obsorption of Ca+2 was lowered in the presence of Mg+² but not in that of K+; nitrate ions had no detrimental or sinergistic offect on the absorption of phosphate.A absorção do cálcio e do fósforo por raízes destacadas da soja var. IAC-2 foi estudada com ajuda de traçadores. Foram verificados os efeitos da concentração iônica externa do tempo, do pH, da temperatura, da aeração e de venenos respiratórios. Os dados sugerem que a absorção do cálcio tenha se dado passivamente, sendo ativa a do fósforo. A absorção cresceu com o pH e a temperatura. Os valores das constantes de Michaelis encontrados concordam com os da literatura