Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Este documento expresa como la representación escrita en forma analítica de un teorema del conjunto de los números reales, acompañada de un gráfico geométrico, confirma la veracidad y validez de la demostración además de mostrarla de una manera visual.

ResumenObjetivos: Evaluar el efecto del tipo de piso en la jaula de parición y número del parto sobre el rendimiento e incidencia de diarrea en lechones. Metodología: Se utilizaron registros de 105 partos de marranas de la línea Camborough 29 de una granja comercial. Para evaluar el efecto de dos tipos de piso en la jaula de parición (polipropileno y concreto) y número del parto (1o, 2o, 3o, 4o, 5o y 6o) sobre el peso al destete de los lechones (PD) y el índice de crecimiento de la camada (ICC), se utilizó el análisis de la varianza de un diseño multifactorial. Los casos de diarreas (CD) por tipo de piso y número del parto se evaluaron mediante la prueba de Kruskal-Wallis. Resultados: El piso de polipropileno mejoró el PD (6,12 ± 0,65 vs. 5,69 ± 0,64) y el ICC (2,42 ± 0,19 vs. 2,21 ± 0,20) en comparación al piso de concreto (P < 0,05), pero no influyó en la incidencia de CD (P ˃ 0,05). El número del parto tuvo efecto sobre el PD, ICC y en la incidencia de CD (P < 0,05). Conclusiones: La jaula de parición con piso de polipropileno mejoró el PD e ICC y no influyó en la incidencia de CD y el número del parto influyó en el PD, ICC y en la incidencia de CD.Palabras clave: Lechón, peso destete, índice de crecimiento, diarrea, jaulas de parición

Objetivos: Determinar el contenido de polifenoles y la capacidad antioxidante de algunos tipos de cervezas artesanales e industriales. Metodología: Se utilizaron un total de diez tipos de cerveza, dos de origen industrial y ocho del tipo artesanal que se expenden y se consumen con mayor frecuencia en la provincia de Huaral, Lima- Perú. El contenido de polifenoles totales se realizó por el método Folin Ciocalteu y la capacidad antioxidante por el método del radical libre 2,2-diphenyl-1-picrylhydrazyl DPPH, utilizando un espectrofotómetro UV–Visible. Para el análisis de los datos, el análisis de la varianza de un diseño completamente al azar y la prueba de Scott- Knott para la comparación de medias fueron utilizados. Resultados: El promedio de polifenoles totales (0,96 vs. 0,53 mg EAG mL ) y la capacidad antioxidante (3,63 vs. 1,16 μMol DPPH mL ) fueron mayores en las cervezas artesanales en comparación a las industriales (P < 0,05). Conclusiones: Las cervezas artesanales contienen mayor concentración de polifenoles y poseen mayor capacidad antioxidante que las cervezas industriales.Palabras clave: Cerveza artesanal, polifenoles, capacidad antioxidante

AbstractObjectives: To determine the effect of the time and the number of lower leaves defoliated, on the productivity of hybrid corn (Zea mays L.). Methodology: Randomized complete blocks design was used, with arrangement of split plot and four replications, using the hybrid cultivar DK 7088. The plots corresponded to the defoliation times: 0, 14 and 28 days after pollination (DAP) and the subplots, number of defoliated leaves (DL): zero, two,four and six. The leaves were defoliated just below the ear, from top to the bottom. The total number of treatments was 12. Scott-Knott statistical test with a level of 5 % was used for the comparison of means. The traits studied were grain weight per ear, ear weight and grain yield per hectare. Results: The interaction between defoliation time and number of lower defoliated leaves was significant (P < 0.05) for grain weight per ear, ear weight andgrain yield. The defoliation of two, four and six leaves during pollination reduced the grain weight per ear, weight per cob and grain yield, being significantly lower than the no defoliated plants. At 14 and 28 days after pollination, defoliation did not affect significantly (P > 0.05) grain yield, but grain weight per ear and ear weight decreased (P< 0.05). Conclusions: The defoliation of lower leaves made during the pollination, reduces the grain weight per ear, ear weight and grain yield, while defoliation 14 days after pollination did not affect significantly the grain yield per hectare.Keywords: Zea mays, defoliation, leaves, grain yield

Este número de la revista SJP está dedicado a recoger diferentes perspectivas sobre los fósiles y los yacimientos paleontológicos desde el punto de vista del patrimonio. El patrimonio paleontológico comprende aquellos yacimientos y fósiles a los que se ha otorgado un valor cultural, sea de tipo científi co, educativo o recreativo. Como tal patrimonio, el paleontológico tiene algunos rasgos específi cos entre los que destacan el hecho de estar constituido a la vez por elementos muebles (fósiles) e inmuebles (yacimientos), y el gran atractivo que ejercen los fósiles entre el público general, una cualidad que es parcialmente responsable del elevado riesgo de degradación que presenta por expolio. Otro rasgo de este patrimonio es que en España se encuentra vinculado a dos normativas diferentes: las derivadas de la Ley 16/1985, de 25 de junio, del Patrimonio Histórico Español, y las vinculadas a la Ley 42/2007, de 13 de diciembre, del Patrimonio Natural y de la Biodiversidad (y de su modifi cación en la Ley 33/2015 de 21 de septiembre). Es importante señalar que, a pesar de esta duplicidad legislativa, el paleontológico es uno de los patrimonios más amenazados en nuestro país, ya que en la práctica ninguna de estas legislaciones ha asegurado la conservación de los yacimientos y el uso responsable de sus fósiles.

La ley de Patrimonio Histórico Español (PHE) de 1985 después de casi 35 años de su promulgación sigue viéndose desde el ámbito de las Ciencias Naturales con escepticismo no exento de contestación. En este trabajo se revisan los orígenes y causas de la inclusión de la Paleontología y Geología en esta ley, así como las consecuencias de su aplicación. Se concluye que solo desde las universidades puede abordarse un plan conjunto que evite la fragmentación e infravaloración de las colecciones paleontológicas, mediante el desarrollo de una red nacional de colecciones paleontológicas.

Peru is currently discussing the definition of socio-economic development and its inherent elements. In that order, citizen participation constitutes a fundamental component in the construction of integral develop ment strategies and national security and defense, based on the knowledge of the processes of analysis of national problems and the definition of transformation requirements, mediated by the strengthening of the organizational capacities of the agents of the process. The main objective of this research is to determine the extent to which a National Participatory Project influences National Defense and Development. The research methodology was of a non-experimental, quantitative, descriptive and applicative design, with a sample of 116 officials from the Presidency of the Council of Ministers and the Ministry of Defense, responsible for the management of strategic projects in the country. The data collection technique applied corresponds to the survey and observation. The study concluded that the level of a National Participatory Project influences na tional development and defense, the country’s economy, social development and the country’s governance process. As a corollary, a proposal for a National Participatory Project (PNP) is presented, structured on the basis of two objectives: 1. Optimize negotiations in the management of projects with agents subject to par ticipation, 2. Optimize project management.

The main objective of the study was to determine to what extent logistics in the Armed Forces of Peru con tribute to National Defense and Development. The investigation was descriptive and the level of application, with a study population represented by 315 officers of the Logistics Command of the Peruvian Army and a sample of 172 officials. A survey-level questionnaire was used as an instrument in the empirical test, in addition to the Chi-square Test for the demonstration of the following Hypothesis: Logistics in the Peruvian Armed Forces contributes significantly to National Defense and Development. After developing the investiga tion, it was concluded that the level of logistics achieved in the Armed Forces of Peru contributes significantly to the National Defense and Development.

The participation of the Armed Forces in public security tasks is a recurring theme worldwide today, more nations are using it in support of the Police or as a direct task, because this looks absolutely surpassed or due to the increase in indications of institutional corruption. In the unique case of the Republic of Peru, the Armed Forces, specifically the army, has been participating in some tasks to support the National Police, in order to combat internal threats. Many of these tasks are covered by legal devices; however, there is a po pular clamor, in addition to requests from some sectors of the State to participate in combating organized crime and common crime, which has no legal framework. In this sense, the investigation focuses on analyzing the possibility of the army fighting organized crime, because the last three governments have failed in their attempt and their strategies have not generated the expected results; on the contrary, this scourge has in creased. Regarding the methodology, the qualitative method was used, specifically the classic hermeneutical design, because the information collected for the analysis focused on the new roles, budgets, strategies and legal framework, also considering the cases of countries such as Mexico and Colombia, in order to determine whether the participation of the army in public security tasks is a convenient alternative.

At present, the political parties have grown in number, but not in the quality of their operation, this low performance has a direct impact on the valuation of the population and the development of the country, for which reason, the research aims to: establish the relationship between the proposed reform of the political party regime and national development. The study presents a quantitative approach, correlational-explana tory modality and a non-experimental design of a Transsectional nature. The population was made up of the citizens of Lima, as shown by 68 citizens, located in markets, supermarkets and shopping centers, to which a survey and 5 technical experts in political party systems were applied to which they were interviewed for a total of 73 individuals belonging to the sample. For the analysis of the information the statistical proce dure was used by means of the codification and tabulation of the information, this process consisted of the classification and ordering in tables. It´s concluded that the design of a proposal to reform the political party regime is directly and significantly related to national development, as evidenced by the results obtained in the hypothesis test process, where the Correlation with a level of significance of 5% turned out to be signif icant at the 0.01 level (2 tails) where p <0.05; consequently, the null hypothesis (Ho) was rejected and the alternate hypothesis (Ha) was accepted.