The systematizing of a design method developed by Relalliok W.B. (1981) is presented, for the calculation of the basic dimennsions of a catalytic incinerator of mixed channel, taking like reference the theorical development and case mentioned by Benitez J. (1993).

In the present study, 24 native supernatants isolated from enterotoxemia fatalities were evaluated to characterize lecitinase, hemolytic, in vitro cytotoxicity, and in vivo enterotoxicity activities of the phospholipase C (Cp-PLC) exotoxin. The lecitinase activity was monitored in microplates using egg white emulsifications, the hemolityc and perfringolisine in microplates using sheep and equine eritrocytes respectively, the cytotoxic activity was tested on HEp-2 cells and the enterotoxicity by inoculating within intestinal loops of rabbits. At the molecular level, all the isolates (12 vegetative and 12 sporulated) were found to contain the cpa gene (genotype A), while six also contained cpb2 gene but none had the cpe gene. These isolates were classified, according the lecitinase activity, as high, medium and low producer strains. Most of the vegetative (66.6%) isolates had high and medi...

Se reportan evaluaciones de sobrenadantes bacterianos (nativos) crudos obtenidos de 24 aislados de C. perfringens de casos fatales de enterotoxemia buscando caracterizar propiedades lecitinasas, hemolíticas, citotóxicas in vitro y enterotóxicas in vivo de la exotoxina fosfolipasa C (Cp-PLC). Los aislados (12 en estados vegetativos y 12 esporulados) contenían el gen cpa (genotipo A), y seis de ellos tenían además el gen cpb2, pero todos carecían del gen de la enterotoxina (cpe). Las actividades lecitinasas fueron evaluadas, en microplacas, usando emulsiones de yemas de huevo; las hemolíticas y perfringolisina en microplacas, usando eritrocitos de carnero y de equino respectivamente; las citotóxicas, en células HEp-2; y las enterotóxicas en conejos inoculados intraintestinalmente. Los aislados fueron clasificados, de acuerdo a los niveles de la actividad lecitinasa, en cepas de ...

The systematizing of a design method developed by Relalliok W.B. (1981) is presented, for the calculation of the basic dimennsions of a catalytic incinerator of mixed channel, taking like reference the theorical development and case mentioned by Benitez J. (1993).

Daphnia magna is proposed as a bioindicator to establish the minimum concentration capable of controlling pests before performing toxicity tests. This study uses the proposed pest control extracts of two Peruvian species, Clibadium peruvianum Poepp. (seeds) and Petiveria alliacea L. (leaves). The toxicological effects of the plant extracts were evaluated with D. magna, using five neonates over a period of 24–48 h. A lack of mobility or the absence of heart rhythm for 15 s under a stereomicroscope was considered to indicate mortality. Organic extracts were discarded due to their higher toxicity when compared with the aqueous extracts of C. peruvianum and P. alliacea, which had LC50 = 460.74 mg/L and LC50 = 711.18 mg L−1 at a concentration of 10 mg L−1, respectively. Using this Daphnia-safe concentration, toxicity tests were performed on the third instar larvae of Musca domestica (ho...

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En este trabajo se realiza un estudio comparativo de los métodos de voltametría cíclica y stripping CO, aplicados para la determinación de área superficial en catalizadores de PtCr3 soportados en carbono vulcan de elevada pureza. La voltametría cíclica es una técnica sencilla y rápida en comparación al stripping de CO, siendo así se realizó un estudio de comparación en la determinación de áreas superficiales de catalizadores con la finalidad de aprovechar esta técnica, lo cual brinda un aporte importante para evaluar el comportamiento catalítico superficial de las nanopartículas de PtCr3. Los resultados mostraron que la voltametría cíclica también puede ser utilizado como técnica para la determinación de área superficial ya que presentó valores muy próximos en comparación con los resultados obtenido por el método de stripping, que es una técnica más común e...

En este trabajo se realiza un estudio comparativo de los métodos de voltametría cíclica y stripping CO, aplicados para la determinación de área superficial en catalizadores de PtCr3 soportados en carbono vulcan de elevada pureza. La voltametría cíclica es una técnica sencilla y rápida en comparación al stripping de CO, siendo así se realizó un estudio de comparación en la determinación de áreas superficiales de catalizadores con la finalidad de aprovechar esta técnica, lo cual brinda un aporte importante para evaluar el comportamiento catalítico superficial de las nanopartículas de PtCr3. Los resultados mostraron que la voltametría cíclica también puede ser utilizado como técnica para la determinación de área superficial ya que presentó valores muy próximos en comparación con los resultados obtenido por el método de stripping, que es una técnica más común e...

This work has been supported by BAYLAT, project nr. 914-20.1.1. T.F. and W.P. have been supported by the DFG, project nr. PO-1337/3-1. J.J.P. acknowledges funding by the Dirección de Gestión de la Investigación at PUCP, through grant DGI-2015-3-0026. N.C.V. has been supported by CienciActiva-CONCYTEC Grant 026-2015. We also acknowledge the financial support of PUCP DARI Groups Research Fund 2016. We would especially like to thank O. A. Díaz in the Dirección de Tecnologías de Información at PUCP, for implementing the code within the LEGION system.

Aviculture is forced to find alternatives to replace antibiotic-type growth promoters to reduce antimicrobial resistance. Among these alternatives we have bacteriophages that are the natural predators of bacteria; however, research point out to their use as therapeutics and not as growth promoters. For this reason, this review article focuses on discussing and projecting the use of lithic bacteriophage cocktails as growth promoters in commercial breeding of broilers, laying hens and quails. Evaluating its effects on production parameters, its application in drinking water and food, phage protection strategies on gastrointestinal pH changes and high pelleting temperatures, strategies against phage-resistance, its effects on the intestinal microbiota, and the use of autophages versus commercial products. It is concluded that the optimal use of bacteriophages in aviculture is through mixed ...

This work presents a brain computer interface (BCI) framework for upper limb rehabilitation of post stroke patients, combining BCI and virtual reality (VR) technology; a VR feedback is shown to the participants to achieve a greater activation of certain brain regions involved with the performing of upper limb motor task. This system uses an adaptive neuro-fuzzy inference system (ANFIS) classifier to discriminate between a motor task and rest condition, the first one classifies between extension and rest conditions; and the second one classifies between flexion and rest conditions. In the training stage, eight healthy subjects participated in the sessions, the best accuracies are 99.3% and 88.9%, as a result of cross-validation. Meanwhile, the best accuracy in online test is 89%. The methodology here presented can be straightforwardly employed as a rehabilitation system for brain repair i...

We study natural supersymmetric scenarios with light right-handed neutrino superfields, and consider the possibility of having either a neutrino or a sneutrino as a dark matter candidate. For the former, we evaluate the possibility of having SUSY corrections on the ν4→ν γ decay rate, such that the NuStar bounds are relaxed. We find that corrections are too small. For sneutrino dark matter, we consider thermal and nonthermal production, taking into account freeze-out, freeze-in, and super-weakly interacting massive particles mechanisms. For the nonthermal case, we find that the νR can reproduce the observed relic density by adjusting the R-sneutrino mass and Yukawa couplings. For the thermal case, we find the need to extend the model in order to enhance sneutrino annihilations, which we exemplify in a model with an extended gauge symmetry. © 2020 authors. Published by the American ...

Statistical data of prevalence of neoplasms and risks in canines associated to age, sex and breed are not available in Quito, Ecuador. In the present study, 13 573 medical records from 2011 to 2014 were evaluated to identify animals diagnosed by cytology and histopathology as positive for some type of neoplasm. The prevalence of tumors in the population was 4.94%, and the most frequent location was in soft tissues (39.3%), skin and annexes (24.4%) and in females, in the mammary gland (14.3%). The relative risk of developing tumors was four times higher in animals older than 6 years of age; moreover, the predisposition of males to develop tumours skin and annexes was two times higher than in females. Purebred animals older than four years of age are up to 70% more likely to develop tumors than crossbred dogs of similar age.

En Quito, Ecuador, no se dispone de información estadística sobre la prevalencia de neoplasias ni su riesgo asociado a edad, sexo y raza de los caninos. En el presente estudio, a partir de 13 573 historias clínicas recabadas entre 2011 y 2014 se identificaron los animales que fueron diagnosticados mediante citología e histopatología como positivos a algún tipo de neoplasia. La prevalencia de tumoraciones en la población fue de 4.94%, siendo más frecuente en tejidos blandos (39.3%), piel y anexos (24.4%) y en hembras, en la glándula mamaria (14.3%). El riesgo relativo de desarrollar tumores fue cuatro veces mayor en animales de seis o más años de edad; asimismo, los machos son dos veces más predisponentes que las hembras a presentar tumoraciones en piel y anexos. Los animales de razas puras y mayores de cuatro años tendrían hasta 70% mayor probabilidad de desarrollar tumores...

We investigate a scenario inspired by natural supersymmetry, where neutrino data is explained within a low-scale seesaw scenario. For this the minimal supersymmetric Standard Model is extended by adding light right-handed neutrinos and their superpartners, the R-sneutrinos. Moreover, we consider the lightest neutralinos to be Higgsino-like. We first update a previous analysis and assess to which extent does existing LHC data constrain the allowed slepton masses. Here we find scenarios where sleptons with masses as low as 175 GeV are consistent with existing data. However, we also show that the upcoming run will either discover or rule out sleptons with masses of 300 GeV, even for these challenging scenarios. We then take a scenario which is on the borderline of observability of the upcoming LHC run assuming a luminosity of 300 fb-1. We demonstrate that a prospective international e+e- li...

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Advances in research on the major causative agents of morbidity and mortality in newborn alpacas associated with enteric processes in southern Peru were reviewed. Microbiology and molecular analyses performed on intestinal samples from enterotoxemia fatalities confirmed the predominance of C. perfringens type A carrying only the gene coding for the major α exotoxin and identifiying for the first time the presence of the novel β2 toxin gene. In vitro studies have yielded three profiles for phospholipase activity (high, medium and low) with biological activity when high and medium strains were inoculated intraintestinally in mice and rabbits, but did not induce intestinal pathology in an alpaca cria. A detailed histopathological investigation has reveled that within necrotizing hemorrhagic enteritis Clostridium coexist with massive presence of Eimeria macusaniensis suggesting that primar...

Advances in research on the major causative agents of morbidity and mortality in newborn alpacas associated with enteric processes in southern Peru were reviewed. Microbiology and molecular analyses performed on intestinal samples from enterotoxemia fatalities confirmed the predominance of C. perfringens type A carrying only the gene coding for the major α exotoxin and identifiying for the first time the presence of the novel β2 toxin gene. In vitro studies have yielded three profiles for phospholipase activity (high, medium and low) with biological activity when high and medium strains were inoculated intraintestinally in mice and rabbits, but did not induce intestinal pathology in an alpaca cria. A detailed histopathological investigation has reveled that within necrotizing hemorrhagic enteritis Clostridium coexist with massive presence of Eimeria macusaniensis suggesting that primar...

Este trabajo se realizó con el apoyo financiero del Consejo Nacional de Ciencia y Tecnología (CONCYTEC) mediante convenio No. 409-2012-CONCYTEC-OAJ, así como por el convenio No. 541-FIDECOM-INNOVATE PERÚ-PIMEN-2015.