This work was carried out with the purpose to optimize physical chemical parameters obtain a microbial biomass from Kluyveromyces marxianus NRRL –Y-1109 y Candida pseudotropicalis BT-UNMSM_6 . The yeasts were grown on sweet whey crude and deproteinized, supplemented with nitrogen and vitamins sources. The optimization of fermentation parameters was obtained applying a Taguchi´s factorial design. It was established as optimal conditions: An pH 4.5; Temperature 30 °C and an aeration rate of 1.475 VVM; Agitation speed 600 RPM, Lactose concentration 5 g/L; (NH4)2S04 6 g/L; Yeast extract 1.5 g/L . The average biomass yield obtained was 0.56 g/g lactose and 0.54 g/g Lactose for K. marxianus and C. pseudotropicalis respectively grown on sweet whey deproteinized diluted 50%, and Cellular yield 0.405 g/g with K. marxianus NRRL-Y-1109 and Yx/s 0.38 g/g with Candida pseudotropicalis grown on sw...

It was developed a biotechnological process to reduce chemical oxygen demand (COD) & Biochemical Oxygen Demand (BOD) from industrial waste water, simultaneously, it was evaluated the potential bioconversion of some yeast into Food yeast & ethanol production. It was produced a reduction of the Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) of potatoes starchy processing industry from 22,5000 Chemical Oxygen Demand (COD) and Biochemical Oxygen demand (BOD) of COD to 1480 mg O2/ L and 26,400 mg O2/L BOD to 2100 mg O2/ L BOD with an aerobic mixed culture of Candida tropicalis BT-UNSM 124 and LIpomyces sp BT-UNMSM-145. It was produced a reduction of Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (DBO) of dairy effluent diluted from 22,100 mg O2/ L COD to 1280 mg O2/ L and 17,500 mg O2 / L BOD to 1100 mg O2/ L of BOD with an aerobic culture of Kluyveromyce...

The biological control of pests & mites on peruvian agriculture was characterized by the intensive use of chemical pesticides. However, the decrease on yield and the emergence of resistance to pesticides have obligated to farmers to increase chemical pesticide use for plague control. This has caused environmental pollution, benefical insects death, persistence chemicals residues on fruits, acute and chronic toxicity risks, moreover an increase on production costs. The objectives of this research were to isolate and to characterize B. thuringiensis native strains, and) to evaluate entomotoxic potential against Spodoptera frugiperda. Were isolated 54 natives strains of Bacillus thuringiensis from peruvian agricultural soils. Microscopic morphology showed parasporal crystals characteristic of B. thuringiensis diversity. The strains were evaluated and confirmed with biochemistry and grow...

The biological control of pests & mites on peruvian agriculture was characterized by the intensive use of chemical pesticides. However, the decrease on yield and the emergence of resistance to pesticides have obligated to farmers to increase chemical pesticide use for plague control. This has caused environmental pollution, benefical insects death, persistence chemicals residues on fruits, acute and chronic toxicity risks, moreover an increase on production costs. The objectives of this research were to isolate and to characterize B. thuringiensis native strains, and) to evaluate entomotoxic potential against Spodoptera frugiperda. Were isolated 54 natives strains of Bacillus thuringiensis from peruvian agricultural soils. Microscopic morphology showed parasporal crystals characteristic of B. thuringiensis diversity. The strains were evaluated and confirmed with biochemistry and grow...

This work was carried out with the purpose to optimize physical chemical parameters obtain a microbial biomass from Kluyveromyces marxianus NRRL –Y-1109 y Candida pseudotropicalis BT-UNMSM_6 . The yeasts were grown on sweet whey crude and deproteinized, supplemented with nitrogen and vitamins sources. The optimization of fermentation parameters was obtained applying a Taguchi´s factorial design. It was established as optimal conditions: An pH 4.5; Temperature 30 °C and an aeration rate of 1.475 VVM; Agitation speed 600 RPM, Lactose concentration 5 g/L; (NH4)2S04 6 g/L; Yeast extract 1.5 g/L . The average biomass yield obtained was 0.56 g/g lactose and 0.54 g/g Lactose for K. marxianus and C. pseudotropicalis respectively grown on sweet whey deproteinized diluted 50%, and Cellular yield 0.405 g/g with K. marxianus NRRL-Y-1109 and Yx/s 0.38 g/g with Candida pseudotropicalis grown on sw...

It was developed a biotechnological process to reduce chemical oxygen demand (COD) & Biochemical Oxygen Demand (BOD) from industrial waste water, simultaneously, it was evaluated the potential bioconversion of some yeast into Food yeast & ethanol production. It was produced a reduction of the Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) of potatoes starchy processing industry from 22,5000 Chemical Oxygen Demand (COD) and Biochemical Oxygen demand (BOD) of COD to 1480 mg O2/ L and 26,400 mg O2/L BOD to 2100 mg O2/ L BOD with an aerobic mixed culture of Candida tropicalis BT-UNSM 124 and LIpomyces sp BT-UNMSM-145. It was produced a reduction of Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (DBO) of dairy effluent diluted from 22,100 mg O2/ L COD to 1280 mg O2/ L and 17,500 mg O2 / L BOD to 1100 mg O2/ L of BOD with an aerobic culture of Kluyveromyce...

Se aislaron 18 cepas nativas de Bacillus thuringiensis y 3 cepas de Bacillus sphaericus con potencial mosquitocida, de 175 muestras de aguas estancadas y suelos agrícolas de diferentes partes del país. Las observaciones microscópicas de colonias características, mostraron la presencia de cristales parasporales típicos de B thuringiensis. Los bioensayos realizados mostraron a las cepas BT-UNMSM-112 y BT-UNMSM-118 como las de mayor capacidad entomocida frente a los primeros estadios de Anopheles pseudopunctipennis y B. sphaericus - Bs-UNMSM 107 mostró la mayor efectividad frente a Culex spp. Se determinó los niveles de susceptibilidad, en el laboratorio, de esta especie a Bacillus thuringiensis var. Israelensis y Bacillus sphaericus, encontrándose una CL50 de 0.215 y 0.360 ìg /mL y CL90 0.236 y 0.428  ìg/ mL para B. thuringiensis BT-UNMSM 112 y BT-UNMSM 118 respectivamente y...

Se aislaron 18 cepas nativas de Bacillus thuringiensis y 3 cepas de Bacillus sphaericus con potencial mosquitocida, de 175 muestras de aguas estancadas y suelos agrícolas de diferentes partes del país. Las observaciones microscópicas de colonias características, mostraron la presencia de cristales parasporales típicos de B thuringiensis. Los bioensayos realizados mostraron a las cepas BT-UNMSM-112 y BT-UNMSM-118 como las de mayor capacidad entomocida frente a los primeros estadios de Anopheles pseudopunctipennis y B. sphaericus - Bs-UNMSM 107 mostró la mayor efectividad frente a Culex spp. Se determinó los niveles de susceptibilidad, en el laboratorio, de esta especie a Bacillus thuringiensis var. Israelensis y Bacillus sphaericus, encontrándose una CL50 de 0.215 y 0.360 ìg /mL y CL90 0.236 y 0.428  ìg/ mL para B. thuringiensis BT-UNMSM 112 y BT-UNMSM 118 respectivamente y...