La tecnología hierro valente cero, aplicada al presente trabajo de investigación, se ha complementado con citrato y radiación solar. La fuente de hierro y citrato fueron la lana de acero comercial y el limón del mercado local de Tacna, los cuales son insumos de bajo costo y de fácil acceso, constituyéndose en una alternativa de solución a nivel domiciliario. La tecnología fue aplicada al agua del río Sama (sector las Yaras). Se planteó un diseño experimental factorial 22, más tres puntos centrales con el fin de determinar el dicto de los factores: Cantidad de hierro (g) y limón (gotas), con ese propósito se mantuvo constante el tiempo de radiación solar y el tiempo de sedimentación. Los resultados obtenidos en el área de exploración indicaron que el único factor significativo es la cantidad de hierro, el comportamiento del proceso fue lineal con un r2 = 75.63 % y la ma...

The objectives of this research were to identify and quantify potentially marketable added value metals, if recovered or extracted, in two rivers called Salado; one located in the Locumba basin (Salado-Locumba) and the other in the Sama basin (Salado-Sama). In addition, perform a correlation analysis of the arsenic (As) and boron (B) contents present in 14 sampling points located in different water sources throughout the two basins. Total and dissolved metals (49) in samples were analyzed using ICP-MS. Robust statistical methods were applied in the correlation, association and reduction analysis of variables. The identified value-addedmetals were: Li, Rb, Cs and Ge in concentrations of 1,818±0,415 mg/L, 0,248±0,048 mg/L, 0,361±0,104 mg/L and 0,005±0,002 mg/L in the Salado-Locumba river, and 1,950±0,544 mg/L, 0,343±0,090 mg/L, 0,401±0,096 mg/L and 0,005±0,002 mg/L in the Salado-Sa...

In the clarification treatment of the water from the Sama river water with moringa seeds from La Yarada Los Palos, an efficient removal of turbidity was achieved as a consequence of the removal of the suspended particles contained in the water of the Sama river in the rainy season. Therefore, the objective of the investigation was to determine the conditions for the treatment with moringa seeds in the clarification of the water of the Sama river using the test method of jugs with moringa seeds doses of 0,1 and 0,2 g/L; flocculation speed of 20 and 30 rpm and flocculation time of 20 and 30 minutes. The best operating conditions required for water treatment were: moringa seeds doses (coagulating agent) 0,2 g/L, flocculation speed 30 revolutions per minute (rpm) and a flocculation time of 30 minutes. Settling time of 90 minutes was established with water from the Sama River with turbidity l...

Para determinar la población bacteriana autóctona del río Maure (Perú) tolerante o que utiliza el arsénico (As) y que en un futuro podrían emplearse en procesos de biorremediación, se realizaron seis muestreos entre agosto y octubre de 2007, aislándose dieciocho (18) morfotipos coloniales con una sola morfología celular: bacilos Gram positivos, tolerantes a diferentes concentraciones de As (arsenito de sodio: 100, 120, 200, 400 y 600 mg/mL). Cuatro de los morfotipos: MA3, MA6, MA9, y MA10, crecieron quimioautotróficamente, en medio M9 + NaAsO2 (600µg/mL) a diferentes velocidades por lo que se trataría de especies diferentes. Para el Perú este constituiría un primer reporte de bacterias acuáticas autóctonas que utilizan As como fuente de energía.

El objetivo de la presente investigación fue proponer una alternativa de solución al problema de falta de horas de abastecimiento de agua subterránea para consumo humano del distrito de Ite, realizando el tratamiento con cloruro férrico para la remoción de arsénico (0,4930±0,0642 mgL-1) de origen natural del río Locumba; que será utilizado como fuente adicional de agua. Metodología: se utilizó un equipo probador de jarras para el estudio de las condiciones de operación. Se aplicó un análisis factorial fraccionado y luego un análisis de superficie respuesta para estudiar en las variables de operación: su influencia, linealidad y las condiciones adecuadas de operación. Adicionalmente se realizó la especiación y el análisis del arsénico(As+3) utilizando la extracción por fase sólida (EFS) y voltamperometría. Resultados: Se logró reducir el número de variables de op...

The aim of the following review is to describe the seasonal reproductive behavior in male and female ungulates, and identify the determinants of reproductive synchrony. Intrinsic and extrinsic factors that influence the reproductive seasonality of ungulates analyzed. Intrinsic factors are related to the same individual such as genotypic and phenotypic characteristics, and implies that the reproductive aspects can not be extrapolated between species and breeds, and are modified by the action of external factors such as photoperiod, availability of food, temperature, latitude, among others. Among these factors are identified primarily photoperiod and food availability. The photoperiod and food availability are the main signals that determine melatonin levels, and this modulates the reproductive function. Photoperiod is related to the intensity of light and darkness that animals are exposed...

The aim of the following review is to describe the seasonal reproductive behavior in male and female ungulates, and identify the determinants of reproductive synchrony. Intrinsic and extrinsic factors that influence the reproductive seasonality of ungulates analyzed. Intrinsic factors are related to the same individual such as genotypic and phenotypic characteristics, and implies that the reproductive aspects can not be extrapolated between species and breeds, and are modified by the action of external factors such as photoperiod, availability of food, temperature, latitude, among others. Among these factors are identified primarily photoperiod and food availability. The photoperiod and food availability are the main signals that determine melatonin levels, and this modulates the reproductive function. Photoperiod is related to the intensity of light and darkness that animals are exposed...

La toxicidad del boro sigue siendo de conocimiento  limitado, aunque estudios experimentales indican efectos en el sistema reproductivo de manera que, el conocimiento sobre sus concentraciones en agua potable es de prioridad para la regulación ambiental. El propósito de este estudio fue determinar los niveles de boro en reservorio de agua potable de la cuenca hidrográfica Locumba, Región Tacna-Perú. Se realizó un muestreo probabilístico aleatorio en los meses de agosto y noviembre del 2016, encontrándose concentraciones de boro (8,681 y 4,148 mg.L-1) por encima al valor regulado (2,4 mg.L-1). La prueba t-Student indicó diferencias estadísticamente significativas (p≥0.05) entre los valores determinados. Se concluyó que, las concentraciones de boro en el reservorio de agua potable durante los meses de agosto y noviembre son un riesgo para la salud humana.

The aim of the following review is to describe the seasonal reproductive behavior in male and female ungulates, and identify the determinants of reproductive synchrony. Intrinsic and extrinsic factors that influence the reproductive seasonality of ungulates analyzed. Intrinsic factors are related to the same individual such as genotypic and phenotypic characteristics, and implies that the reproductive aspects can not be extrapolated between species and breeds, and are modified by the action of external factors such as photoperiod, availability of food, temperature, latitude, among others. Among these factors are identified primarily photoperiod and food availability. The photoperiod and food availability are the main signals that determine melatonin levels, and this modulates the reproductive function. Photoperiod is related to the intensity of light and darkness that animals are exposed...

The aim of the following review is to describe the seasonal reproductive behavior in male and female ungulates, and identify the determinants of reproductive synchrony. Intrinsic and extrinsic factors that influence the reproductive seasonality of ungulates analyzed. Intrinsic factors are related to the same individual such as genotypic and phenotypic characteristics, and implies that the reproductive aspects can not be extrapolated between species and breeds, and are modified by the action of external factors such as photoperiod, availability of food, temperature, latitude, among others. Among these factors are identified primarily photoperiod and food availability. The photoperiod and food availability are the main signals that determine melatonin levels, and this modulates the reproductive function. Photoperiod is related to the intensity of light and darkness that animals are exposed...