The stirring speed required for the culture of kefir grains was studied, to optimize its growth in a culture medium of molasses and whey. The results show that this mixture of microorganisms requires stirring to optimize its growth and can grow in a wide range of stirring speeds, from laminar flow, with Reynolds number lower than 2000, to turbulent flow with Reynolds number greater than 3500. This shows that the culture of kéfir grains, can adapt to different stirring speeds, making its culture very easy with respect to this variable

The stirring speed required for the culture of kefir grains was studied, to optimize its growth in a culture medium of molasses and whey. The results show that this mixture of microorganisms requires stirring to optimize its growth and can grow in a wide range of stirring speeds, from laminar flow, with Reynolds number lower than 2000, to turbulent flow with Reynolds number greater than 3500. This shows that the culture of kéfir grains, can adapt to different stirring speeds, making its culture very easy with respect to this variable

Se obtuvo carbón activado (CA) a partir de la cáscara de la calabaza (Cucurbita ficifolia Bouchë) por activación química, usando ácido fosfórico (H3 PO4 al 30 y 60%) y cloruro de zinc (ZnCl2 al 1%) como agentes activantes. Estos tres grupos fueron sometidos a tres distintos tiempos de activación (45, 60 y 75 minutos) para obtener nueve tratamientos. Cada tratamiento se repitió por triplicado. Se halló el rendimiento, humedad y cenizas de los nueves tratamientos. Asimismo, se evaluó la capacidad de adsorción de azul de metileno. Los resultados señalan que el agente activante influye en la capacidad de adsorción del colorante. Los carbones activados obtenidos con ácido fosfórico adsorbieron alrededor del 95%; mientras que los otros alrededor del 90%. Los mejores resultados se consiguieron con el CA AF30-60, con un rendimiento de 42%, humedad 7,73% y cenizas 4,59%. Estos res...

Oregano (Origanum vulgare L.) is an aromatic native plant originated from the Mediterranean region and it's traditionally grown in the south of Peru. The crop has adapted well over 2600 m.a.s.l. Bellow this altitude, the concentration of essential oils (thymol and carvacrol) decreases. The development of this method is essential to provide tools for decision making to identify regions where one or more ecotypes can potentially grow and produce high quality of essential oils contents of thymol and carvacrol. As part of the activities, it was necessary to develop a protocol to quantify HPLC for the oregano crop. The proposed method uses a HPLC with a fluorescence detector, isocratic mobile phase of acetonitrile and water (ACN): H O (50:50), a column Purospher® STAR rp-18e (4.6 x 2 150mm, 5µm), flow 1 ml/minute, injection volume of 20 µLand run time of 15 minutes. The present method has ...