ABSTRACT
This work applied environmental isotope techniques to validate the results of previous studies on recharge sources in a rural area in central Chile (34.3° S and 71.3° W) and discern the origin of nitrate contamination in wells. Stream water and groundwater samples were taken during three surveys, two during spring snowmelt and one in low-water conditions. Chemical analyses included major cations and anions, isotope analyses included 18O-H2O; 2H-H20; 3H-H20; 18O-NO3 - and 15N-NO3 -. The stable isotope data show that surface water and deep groundwater present depleted isotope values associated with recharge from the Andes Mountains and that shallow groundwater has more enriched isotope values that reflect the contribution of local recharge from rainwater infiltration. Depleted isotope values observed in shallow groundwater show the effect of recirculated river water used for irrigation. These results are consistent with the conceptual groundwater model developed in previous studies. Some wells have nitrate concentrations above the allowable limit for drinking water. The stable nitrogen isotopes indicate that nitrate is associated mainly with urea and ammoniacal fertilizers, and nitrate is attenuated by denitrification. The results of this study are relevant to improving management of groundwater resources used for drinking water.
Subject(s)
Environmental Monitoring/methods , Groundwater/chemistry , Nitrates/analysis , Nitrogen Isotopes/analysis , Rivers/chemistry , Water Pollutants, Chemical/analysis , Agriculture , Chile , Drinking Water/standards , Fertilizers/analysis , Seasons , Water Cycle , Water WellsABSTRACT
BACKGROUND: Keratocystic odontogenic tumor (KCOT) is a rare, benign, intraosseous tumor of odontogenic origin with a potential of aggressive and infiltrative behavior. It shows specific histopathological features, and has a high recurrence rate. CASE DETAILS: The presented case was of a 30 years old man from South Ethiopia, with a giant keratocystic odontogenic tumor of the mandible. CONCLUSIONS: Although the occurrence of KCOT is rare, attention should be given during its clinical diagnosis. In this report, we presented the aggressive surgical management of a KCOT in a 30 years old patient with no evidence of recurrence within six monthsof follow-up.
Subject(s)
Mandibular Neoplasms/pathology , Odontogenic Cysts/pathology , Odontogenic Tumors/pathology , Adult , Diagnosis, Differential , Humans , MaleABSTRACT
Se realizó un estudio descriptivo y transversal de 106 escolares de 5 a 6 años de la escuela primaria "José de la Luz y Caballero", del municipio de Contramaestre, desde noviembre de 2010 hasta enero de 2011, con vistas a valorar la influencia de la lactancia materna en la aparición de maloclusiones, para lo cual se analizaron variables de interés para la investigación. En la serie predominaron el sexo femenino, la lactancia materna combinada, así como la lengua protáctil y la succión digital como hábitos bucales deformantes. Se concluye que la lactancia materna combinada ocasionó la aparición de dichos hábitos, lo que unido al poco desarrollo transversal de los maxilares podría relacionarse con el origen de las maloclusiones.
A descriptive and cross-sectional study of 106 school children with 5-6 years from "José de la Luz y Caballero" primary school, Contramaestre municipality was carried out from November, 2010 to January, 2011, with the objective of evaluating the influence of breast feeding in the occurrence of malocclusions, for which variables of interest were analyzed for the investigation. Female sex, the combined breast feeding, as well as the protactile tongue and the digital suction as deforming oral habits prevailed in the series. It is concluded that combined breast feeding caused the occurrence of these habits, what could be related to the origin of the malocclusions, together to the small traverse development of upper and lower jaws.
Subject(s)
Breast Feeding , Dental Care , MalocclusionABSTRACT
Se realizó un estudio descriptivo y transversal de 106 escolares de 5 a 6 años de la escuela primaria José de la Luz y Caballero, del municipio de Contramaestre, desde noviembre de 2010 hasta enero de 2011, con vistas a valorar la influencia de la lactancia materna en la aparición de maloclusiones, para lo cual se analizaron variables de interés para la investigación. En la serie predominaron el sexo femenino, la lactancia materna combinada, así como la lengua protáctil y la succión digital como hábitos bucales deformantes. Se concluye que la lactancia materna combinada ocasionó la aparición de dichos hábitos, lo que unido al poco desarrollo transversal de los maxilares podría relacionarse con el origen de las maloclusiones(AU)
A descriptive and cross-sectional study of 106 school children with 5-6 years from José de la Luz y Caballero primary school, Contramaestre municipality was carried out from November, 2010 to January, 2011, with the objective of evaluating the influence of breast feeding in the occurrence of malocclusions, for which variables of interest were analyzed for the investigation. Female sex, the combined breast feeding, as well as the protactile tongue and the digital suction as deforming oral habits prevailed in the series. It is concluded that combined breast feeding caused the occurrence of these habits, what could be related to the origin of the malocclusions, together to the small traverse development of upper and lower jaws(AU)
