14 research outputs found

    Supplementary Information - Sulfate reduction rates in the sediments of the Mediterranean continental shelf from combined dissolved inorganic carbon and total alkalinity profiles

    No full text
    This dataset contains supporting information for the manuscript titled: Sulfate reduction rates in the sediments of the Mediterranean continental shelf from combined dissolved inorganic carbon and total alkalinity profile

    Technical Note: The effect of vertical turbulent mixing on gross O<sub>2</sub> production assessments by the triple isotopic composition of dissolved O<sub>2</sub>

    No full text
    The <sup>17</sup>O excess (<sup>17</sup>&Delta;) of dissolved O<sub>2</sub> has been used, for over a decade, to estimate gross O<sub>2</sub> production (G<sup>17</sup>OP) rates in the mixed layer (ML) in many regions of the ocean. This estimate relies on a steady-state balance of O<sub>2</sub> fluxes, which include air–sea gas exchange, photosynthesis and respiration but notably, not turbulent mixing with O<sub>2</sub> from the thermocline. In light of recent publications, which showed that neglecting the turbulent flux of O<sub>2</sub> from the thermocline may lead to inaccurate G<sup>17</sup>OP estimations, we present a simple correction for the effect of this flux on ML G<sup>17</sup>OP. The correction is based on a turbulent-flux term between the thermocline and the ML, and use the difference between the ML <sup>17</sup>&Delta; and that of a single data-point below the ML base. Using a numerical model and measured data we compared turbulence-corrected G<sup>17</sup>OP rates to those calculated without it, and tested the sensitivity of the GOP correction for turbulent flux of O<sub>2</sub> from the thermocline to several parameters. The main source of uncertainty on the correction is the eddy-diffusivity coefficient, which induces an uncertainty of &sim;50%. The corrected G<sup>17</sup>OP rates were 10–90% lower than the previously published uncorrected rates, which implies that a large fraction of the photosynthetic O<sub>2</sub> in the ML is actually produced in the thermocline

    Scents and sensibility

    No full text

    Hygiene habits and carriers in families with a child who has had typhoid fever Hábitos de higiene y portadores en familias que tuvieron un niño con fiebre tifoídea Hábitos de higiene e portadores em famílias que tiveram uma criança com febre tifóide

    No full text
    The relationship between asymptomatic shedding of bacterial enteropathogens and the hygiene habits of families who have had a child with typhoid fever (TF) are investigated. The sample was made up of 80 families: 40 families in which one child had had TF (Group A) and 40 in which no children or either of the parents had had a history of TF (Group B). In each group 20 families belonged to a low socieconomic status (SES) and 20 to a high SES. A structured interview was used to evaluate the SES and the hygiene habits of the child; observations were made to measure the hygiene habits of the family (toilet, kitchen and food preparation) and bacteriological studies (fecal samples and hand markers). Results show that carriers were more frequent in Group A than in Group B. The bacterial species found were significantly more numerous in Group A than in Group B (fecal samples: E. coli, the classic serotypes, Shigella ssp, and hand markers: E. coli). Families of Group A had higher carriage rates than those of Group B. Finally there exists a significantly higher association between inadequate hygiene habits and carrier families. These results show the need to teach specific habits of proper hygiene to the entire population, because the fact of belonging to the high SES does not in itself preclude inadequate hygiene habits.<br>El objetivo de este estudio fue investigar las relaciones entre la presencia de portadores de agentes bacteriales enteropatógenos y la calidad de los hábitos de higiene en familias que han tenido o no un niño con fiebre tifoídea (TF). La muestra estuvo formada por 80 familias: 40 en las que hubo un niño con FT (grupo A) y 40 en las que ni los niños y sus padres habían tenido una historia de FT (grupo B). En cada grupo 20 familias pertenecían al nivel socieconómico bajo (NSE) y 20 al NSE alto. Se usó una entrevista estructurada para evaluar el NSE, los hábitos de higiene del niño; observaciones estructuradas para medir los hábitos de higiene de la familia (baño, cocina y preparación de alimentos) y estudios bacteriológicos (muestras fecales y marcadores de mano). Los resultados señalan que los portadores fueron más frecuentes en el grupo A que en el B. Las especies bacterianas fueron significativamente más en el grupo A que en el B (muestras fecales: E. coli, serotipos clásicos, Shigella ssp, y marcadores de mano: E. coli). Las familias del grupo A tenían tasas más altas de portación que aquellas del grupo B. Finalmente existe una asociaión significativamente alta entre los hábitos inadecuados de higiene y las familias portadoras. Estos resultados muestran la necesidad de enseñar hábitos específicos de higiene adecuada a toda la población, porque el solo hecho de pertenecer al NSE alto no previene los hábitos de higiene inadecuados.<br>Objetivou-se estudar a relação entre qualidade dos hábitos de higiene e presença de portadores de agentes bacterianos enteropatogenos, em famílias que tiveram ou não, uma criança com febre tifóide (FT). A amostra esteve constituída por 80 famílias: 40 com a presença , em cada uma, de uma criança com FT (Grupo A) e 40 em que nem as crianças e seus pais nunca tiveram história de FT (Grupo B). Em cada grupo, 20 famílias pertenciam ao nível socioeconômico (NSE) baixo e 20 ao NSE alto. Para avaliar o NSE e os hábitos de higiene da criança foi utilizada entrevista estruturada; para medir os hábitos higiênicos da família (banho, cozinha e preparo dos alimentos) foram utilizadas observações estruturadas; e os estudos bacteriológicos foram realizados em amostras de fezes e marcadores de mão. Os resultados mostraram que no grupo A houve maior freqüência de portadores que no B. As espécies bacterianas foram significativamente mais freqüentes no Grupo A que no B (nas fezes: E. coli, serotipos clássicos, Shigella ssp; e em marcadores de mão: E. coli). As famílias do grupo A tiveram taxas altas de microorganismos que as do grupo B. Foi encontrada associação significativamente alta entre hábitos inadequados de higiene e as famílias portadoras. Os resultados mostraram a necessidade de ensinar hábitos específicos de higiene adequada a toda a população, pois somente o fato de pertencer ao NSE alto não previne os hábitos de higiene inadequados
    corecore