La neosporosis es una parasitosis que afecta el rendimiento económico con pérdidas importantes para la industria pecuaria al ocasionar abortos y mortalidad neonatal. El objetivo del presente estudio fue determinar la seroprevalencia de la infección por Neospora caninum en bovinos de una granja lechera, ubicada en el distrito de La Molina, departamento de Lima, en el año 2005. Se evaluaron 56 muestras de suero sanguíneo, recolectadas de vacas Holstein, mediante la prueba de inmunofluorescencia indirecta (IFI). El 69.64 % de los animales presentaron anticuerpos contra el parásito. Se encontró evidencia de transmisión vertical y horizontal; la edad no representó un factor de riesgo, pero existe la predisposición de que el animal adquiera la enfermedad conforme avanza la edad. Estos resultados corroboran la presencia de N. caninum en bovinos lecheros de la cuenca de Lima.

Los objetivos de la investigación fueron: 1) comparar la tasa de fertilidad y preñez en vacas Holstein obtenidas con el protocolo de Inseminación Artificial a Tiempo Fijo (IATF) Ovsynch o con la Inseminación Artificial a Celo Detectado (IACD), y 2) calcular el valor actual neto (VAN) del uso del Ovsynch y de la IACD. Los animales experimentales fueron del establo lechero de la Unidad Experimental de Zootecnia (UEZ)-Facultad de Zootecnia de la Universidad Nacional Agraria La Molina (UNALM). El protocolo Ovsynch consistió en: 0.02 mg (i.m.) de buserelina (GnRH) en el día 0, 1.25 mg (i.m.) de cloprostenol (PGF2α) en el día 7, y una segunda dosis de buserelina (0.02 mg/i.m.) en el día 9. Entre las 16 y 18 horas después del último tratamiento, se realizó la IATF. Las vacas diagnosticadas no preñadas después de la IATF fueron inseminadas a CD. En el programa IACD, las vacas recib...

The leaching of valuable metals from mineral ores is the basis of several extractive economies around the world, but the strategies employed often need to rely on dangerous compounds such as cyanides. Due to the complex nature of most ores, leaching processes are slow and have a low efficiency in noble metal extraction, which is usually improved by fine-milling the mineral. In this manuscript, we consider this strategy, demonstrating that it may increase the amount of silver leaching, but at the expense of a higher consumption of cyanide, which renders the process inefficient (only 2% of consumed cyanide is employed to complex silver). The increase in the yield of the desired product without the smarter use of dangerous compounds is shown as a paradigm of the need to insert green chemistry principles in industrial processes. We further present the result of two potential strategies for g...

In the present research, we have evaluated the effect of Lupinus mutabilis Sweet's seed, as watery and methanolic extracts on the gastric mucous of rats, following the Lee's method. Indometacin in doses higher than 50 mg per kg of weight causes lineal lesions, enlarging and dilatation of small intestine; partial obstruction, acute and chronic transmural granulomatous inflamation; abscess in the intestine's crypts and fibrosis. 2000 mg/kg of weight of the watery extract of the Lupinus was administered by mouth and 400 mk/kg of the methanolic extract by the same way.We use four groups of ten male rats each one with 250 g of weight approximately that were previously conditionated in our laboratory supplying food and water ad libitum. The animals were distributed in four groups in aleatory way and they received saline solution, ranitidine, watery extract of Lupinus and methanolic extract of ...

In the investigation carried out in the seed of Lupinus mutabilis Sweet it has been possible to identify by means of a Screening Phitochemistry the present biologically active principIes in the watery extract in boiled, being determined the total alkaloids.The acute toxicity has been evaluated (LD50) so much of the watery extract as of the obtained total alkaloids of the seed.In the watery extract of the seeds the activity antiinflammatory has been evidenced (acute and subchronicle) in experimental models, being administered the Lupinus for oral route to a dose of 2000 mg/Kg of weight. The inflammation was evaluated by different techniques using the technique of Granuloma of Pouche with trementin in rats (Inflammation sub-chronicle) and inflammatory to plant with formol to 1 % and ovoalbúmina to 50% in S.S.I. in mice, following the standard techniques of the CYTED, being obtained the ma...

Este trabajo de investigación fue desarrollado durante noviembre y diciembre de 2004 y entre enero y marzo de 2005, en las comunidades de Muñani (Región natural Suni) y Suatía (Región natural Puna) de la provincia de Lampa, Región Puno. El objetivo fue determinar las especies vegetales y el uso alimenticio, medicinal y biocida en ambas comunidades. Para determinar la riqueza se aplicaron cuadrantes de 1 m2 al azar y para determinar su uso, se realizó entrevistas a los pobladores de mayor de edad. Comparando la riqueza vegetal en ambas comunidades, el índice de diversidad de Shannon – Weaner expresó 2.2963 para la comunidad de Suatía y 2.4964 para Muñani. Aplicando la prueba de significancia, se encontró diferencia significativa entre ambas comunidades (P < 0.05). Se recopiló información sobre el uso de la flora etnobotánica, encontrándose 15 especies aliment...

Leaching of polymetallic sulfides is often challenging due to the complexity of these systems. The main issues are related to the formation of surface by-products or to the presence of different metals that require a greater consumption of chemicals compared to that needed to extract the target metal during leaching. This latter case is followed in the present work using X-ray photoelectron spectroscopy (XPS) during the leaching of a silver-containing polymetallic (Mn-Fe-Pb) sulfide under three different cyanidation procedures: (1) conventional leaching, (2) ultrasound-assisted leaching, and (3) leaching of a sample pretreated in alkaline media. In all cases, leaching results in the build-up of Pb compounds (oxides/hydroxides) on the surface of the minerals, suggesting a mechanism in which Pb is first leached by hydroxide and cyanide and later is re-adsorbed as an external layer on the m...