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

The study aims to apply the active methodological strategy "Teamwork" to improve the development of the competence "solving quantity problems" in students of the Fourth Grade of Primary Education in the area of Mathematics at the Emblematic Educational Institution "Simón Bolívar” Of Moquegua in 2019. As scopes we have that it was possible to diagnose the factor that causes the low academic level in students, then describe the way in which the active methodological strategy "Teamwork" is applied and in this way analyze the elation ship that exists between the two variables, concluding with demonstrating its effectiveness. This research is characterized by having used the application-type methodology, with a quasi-experimental design of two non-randomized groups. The population consisted of 79 students, obtaining as a result that in section "A" as in "C" a "level of achievement" of 17% was obtained, and in the "process level" a 14% was obtained. in section "A" and 4% in section "C" demonstrating significant efficacy in the two experimental groups. The significant conclusion is that "achievement" was obtained in section "A" of 24% and in "C" of 28% and in section "Process" it was obtained in section "A" of 20% and in the "C" of 7%, which shows a substantial improvement.

The points-based driver's license system is one of the coercive measures that are gaining greater popularity among states, by granting the possibility of penalizing repeat offenders with a reduction of points and, in extreme scenarios, the definitive withdrawal of the driving license. In this article, an analysis of the infractions committed by drivers who use the roads of the Santo Domingo canton, a town in Ecuador, is carried out, establishing the period 2000-2019 for the analysis; the year 2011 was the point of separation between the offenses committed before and after the implementation of the point-based driver's license system. The findings show that the measure contributed to reducing the generation of traffic violations by 18.85% in the 2011-2019 period compared to the 2000-2010 period. The conclusions obtained provide evidence to design public policies related to land transport management and the development of future research.

The objective was to determine the factors that influence retention in the first year of secondary technical-professional education of students entering the Universidad de La Serena (2010 to 2015). The correlational study determines the retention of the socioeconomic and academic factor; it specifies the association between the variables. The study population was 1119 students, retention is 79.3%. Most of the students come from the Coquimbo region, the average age is 20 years, there are more men than women, and the predominant family income is from $74,970 to $193,104 (Chilean pesos). For the statistical analysis software SPSS version 22 is used, Chi-Square Test is applied to determining the relation between variables and Binary Logistics Regression searching the predictive model of retention and specify how the socioeconomic and academic factor influences it. The factors have different importance within the model, its importance depends on the value of the odds ratio (OR). Predict Retention is the University Records Rate (OR= 21,683) and Mathematics University Admission Test (OR = 8.489). The research determinate that lower Mathematics University Admission Test scored, higher Retention Probability.

Alcohol consumption is a problem that has grown in the last 20 years in the world and a population that was affected is the youth, for this reason the present study proposes to analyze the psychometric evidence of the AUDIT in university students in Lima. The study is of instrumental design and the sampling applied was non-probabilistic by convenience. The results showed that the questionnaire presents adequate adjustment indexes, where X2/gl: 1.32, WRMR: 0.71, NFI: 0.99, CFI: 0.99, GFI: .99, AGFI: .98, RMSEA: 0.06, SRMR: 0.03 and TLI: 0.98, resulting adequate. A reliability of α=.86 and ω=.87 was found, and differences were identified in its use for the virtual and physical modalities. It is concluded that the AUDIT has optimal properties to assess excessive alcohol consumption.

In Venezuela, the physiological performance of adult cocoa trees under full sun exposure is unknown. The long-term effect of high photon flux density (PFD) on leaf water potential (Y), leaf area index (LAI), gas exchange, photochemical activity of PSII, and photosynthetic pigment content in adult cocoa trees of Ocumare 61 (OC-61) was evaluated, in order to know if OC-61 could have a good photosynthetic performance in plants grown in full sun (E) or if on the contrary there is a physiological disadvantage compared to those grown in shade (S), self-shaded leaves were also evaluated in each condition (E+A and S+A). The OC-61 clone grown in E showed significant changes in some physiological traits: lower Y, lower IAF, higher rates of photosynthesis (A) and water use efficiency (WUE), lower intercellular CO2 concentration (Ci) and lower total chlorophyll, and carotenoid content. An increase in electron transport rate, PSII quantum efficiency, photochemical and non-photochemical extinction coefficient was found that would partially explain the higher A's in E; there was no decrease in maximum quantum efficiency indicating the absence of photoinhibition. Clone OC-61 is a shade tolerant crop; however, the results indicate that it can be acclimatized to high sun exposure without damage to PSII functioning, which could represent a physiological advantage for clone OC-61 grown in the study area.

Processed foods present migration of chemical compounds after the packaging process, and the main migrants come from plastic containers, in which multiple additives are added to improve the functional properties of polymers and incorporate them into transformation processes and subsequent use in packing plants. Additionally, the use of new materials has increased and with it the number of hazards that are incorporated into its chemical structure, which is why this study aims to identify possible chemical compounds that migrate from containers made of plastic materials based on polypropylene resin (PP) that are used to be in direct contact with fatty foods. Due to the above, a bibliographic review type investigation was carried out, identifying the list of chemical compounds with potential risk to the health of the consumer, being low molecular weight compounds one of the most important problems, however, this type of raw materials continues to gain ground in the market, from the results obtained from various investigations show that 83% migration of chemical compounds comes from mixing between (Irganox 1076, Irganox 1010 and irgafos168). In this way, this research constitutes a source of important bibliographic information to carry out a specialized study on the migration of compounds into food and a starting point to implement monitoring or regulations on migrating compounds in PP containers in Ecuador.

Maize (Zea mays) is a cereal of great importance for human and animal food security. Yields are conditioned by genetic and nutritional factors, especially Nitrogen (N), incorrect application can affect grain yield or cause environmental damage. In this research, the effect of two commercial hybrids of hard yellow maize by nitrogen dose and grain yield was studied. This work was carried out during the months of June to November of the year 2019, in the premises of the Pichilingue Tropical Experimental Station at the National Institute of Agricultural Research (INIAP), belonging to Mocache canton, Los Ríos province. Doses of 0, 69, 138, 207 y 276 kg.ha-1 of nitrogen were evaluated. For the development of the research, a plot of 1440 m2 was used, designed in complete blocks at random in divided plots, with three repetitions and twelve treatments. The variables were subjected to statistical analysis and the analysis of variance was used to determine the interaction between hybrids and nitrogen, the means of each treatment were compared using Tukey's test (p>0.05). The high-yield hybrid H2 expressed its productive potential with the evaluated doses of N; however, doses higher than 69 kg.ha-1 of N are not necessary for this hybrid as it has the same behavior in its grain yield.

The objective of this research was to quantify the fermentation capacity and nutritional quality of corn silage with the inclusion of nitrogen sources such as chicken manure and soybean forage (Glicine max (L.) Merr.). The treatments were: corn forage alone or control (FM); Corn with inclusion of 10% soybean forage (FS10); Corn with 20% soybean forage (FS20); T4, Corn with 30% soybean forage (FS30); T5, Corn with 5% chicken manure (G5); T6, Corn with 10% chicken manure (G10) and T7, Corn with 15% chicken manure (G15). It was evidenced that the addition of poultry manure significantly increased the content of dry matter (DM), while the soybean forage (FS) presented similarity with the control. The total protein content (TP), due to the effect of the addition of FS, was higher than the other treatments studied. The nitrogen sources used did not affect the total fiber content (TF). The ash concentration value (C) was strongly affected by the addition of chicken manure. The content of ammoniacal nitrogen (N-NH3) increased with the inclusion of chicken manure in the silage process. The pH value, the concentration of lactic and butyric acid was significantly higher with the addition of chicken manure. In conclusion, it can be indicated that the addition of both chicken manure and soybean forage improve the nutritional content of corn silage, however, the inclusion of soybean forage is much more favorable in terms of fermentative variables.  

The objective of the trial was to evaluate the relative weight of different organs and allometric changes of the gastrointestinal tract of broilers, supplemented with oregano leaf meal (HO) as a growth promoter, in mixing proportions with the balanced feed (AB). At 21 days of the starter phase and 42 days of fattening, the weight of the proventriculus, gizzard, duodenum, jejunum and ileum was quantified; as well as, their respective allometric coefficients were determined; in addition, the entire small intestine. A completely randomized experimental design was used, with a total of 208 Ross line chicks distributed in four treatments: T1= 100% balanced feed (AB100%); T2= Balanced feed+0.25% oregano flour (AB+0.25%HO); T3= Balanced feed+0.50% oregano flour (AB+0.50%HO) and T4= Balanced feed+0.75% oregano flour (AB+0.75%HO), with four repetitions, each experimental unit constituted by 13 birds. An analysis of variance was performed on the quantified variables and the average values ​​were compared by Tukey at 5% probability. The concentration of 0.25% HO in combination with BA favored the values ​​obtained for the relative weights at 21 and 42 days of the duodenum, jejunum, ileum, as well as for the entire small intestine. All organs showed slow allometric growth (CA<1) in relation to body weight in the initial and fattening phase, except for the proventriculus, which showed greater growth (CA>1).

The in vitro activity of indigenous microorganisms (Lactobacillus brevis, Bacillus subtilis and the mixture of both) to reduce the colonization of Salmonella enterica in vitro was determined. A DCA with factorial arrangement (3x3) was used, being the factors the microorganisms and diffusion methods (direct, filtered and diluted) in the inhibition of the confrontation of microorganisms, with the use of the Kirby-Bauer technique. Survival in bile salts performed by the CFU count, under a design that had four treatments. The microorganisms with the application of three methods against Salmonella enterica had a favorable growth at 24 hours, obtaining a greater development with Lactobacillus brevis + Bacillus subtilis by filtration method. Survival to bile salts, no variability of results was found. However, L. brevis without bile salts stood out from minute 30 to minute 120. It is concluded that both microorganisms meet physical and biological characteristics, being suitable alternatives to be used as probiotics in animal feed for animal production purposes.