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1
artículo
Impact of two tillage practices on selected soil properties, growth and yield of maize on an ultisol
Publicado 2022
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This study investigated the effect of two tillage practices on maize yield and growth, and selected soil properties of an Ultisol of Osun State in Nigeria. This was aimed at selecting an appropriate tillage practice for crop growth and soil maintenance. The study was divided into two experimental plots during the early and late cropping season in 2014. The first plot was manually cleared to have zero tillage while the second plot was plowed twice and harrowed once for conventional tillage. Each plot had three blocks (23.0 m x 2.5 m) with an alley of 1.0 m between blocks and 1.0 m within plots. Three seeds of the test crop were a distance of 75 cm x 50 cm per hill and each plot weeded manually at two weeks intervals till harvest. The selected soil physical and chemical properties and plant growth parameters were collected and determined using standard method after each cropping season. At...
2
artículo
Publicado 2023
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The indiscriminate use of chemical products in agriculture degrades the soil ecosystem, to mitigate this situation, it is proposed to determine the effect of organic matter on the physicochemical characteristics of the soil and the yield of purple corn (Zea mays L.), it was used the DBCA experimental design with 4 repetitions and with the following treatments: T1: INIA 615/30 t/ha EV; T2: INIA 615/40 t/ha EV; T3: INIA 615/30 t/ha ECS; T4: INIA 615/40 t/ha ECS; T5: INIA 615/200N-150P205-120K2O; T6: PMV 581/30 t/ha EV; T7: PMV 581/40 t/ha EV; T8: PMV 581/30 t/ha ECS; T9: PMV 581/40 t/ha ECS and T10: PMV 581/200N-150P205-120K2O. The analyzes showed that by incorporating organic and inorganic fertilizers the texture of the sandy loam soil remains the same, however, after a certain time, the values of the physicochemical properties of the soil increase and after sowing purple corn, thes...
3
artículo
Publicado 2022
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Thermal regulation and ultrasound affect the physical, chemical, and antioxidant properties of essential oils and hydrosols extracted by microwaves from the leaves of Tagetes elliptica S. (chincho). The leaves were conditioned by dehydration or freezing, then pre-treated with ultrasound for 15 or 30 minutes at 40 Hz to finally obtain the essential oil (AECH) and hydrolat (HCH) through microwave extraction (500 W and 30 minutes). Yields, phenolic content, antioxidant capacity, leaf structure by optical microscopy, and chemical composition by gas chromatography and mass spectrometry (GC-MS) were evaluated. The conditioning of the leaves by freezing and sonication for 30 minutes obtained the best performance, 8.86±0.1% and 67.40 ± 4.8%, phenolic content of 39.4±0.1 mg EAG/mL and 346.2 ± 13.6 mg EAG/mL, and antioxidant capacity of 35.7 μmol EqT/mg and 0.25 μmol EqT/mg equivalent, for A...
4
artículo
Publicado 2012
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The theory of the Multiple Intelligence represents an innovative vision in the field of the psychology of the education, because it offers a different mark for the best alignment in the teaching-learning process, making possible that the student identifies his strong and weak intellectual points better; and that, with this information, the or the educational one selects the resources and didactic strategies so that in work group that it develops even more the strongest and improve the weak ones, always looking for the achievement of their personal satisfaction and professional success. In this perspective, the evaluation of the multiple intelligence in a valid and reliable way acquires fundamental importance, for what we decide to elaborate one when not existing in the country instruments with these characteristics; also, also interested in the problem of the first floor school yield in ...
5
artículo
Publicado 2012
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The theory of the Multiple Intelligence represents an innovative vision in the field of the psychology of the education, because it offers a different mark for the best alignment in the teaching-learning process, making possible that the student identifies his strong and weak intellectual points better; and that, with this information, the or the educational one selects the resources and didactic strategies so that in work group that it develops even more the strongest and improve the weak ones, always looking for the achievement of their personal satisfaction and professional success. In this perspective, the evaluation of the multiple intelligence in a valid and reliable way acquires fundamental importance, for what we decide to elaborate one when not existing in the country instruments with these characteristics; also, also interested in the problem of the first floor school yield in ...
6
tesis de grado
Publicado 2017
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La conjetura de Fermat fue uno de los acertijos matemáticos más misteriosos hasta 1995. El problema fue formulado en 1637 por Pierre de Fermat. Él afirmó saber cómo resolverlo, sin embargo, no podía mostrar la prueba debido a que el espacio en el margen de su copia de Arithmetica de Diofanto era insuficiente. Desde entonces mucho misticismo rodeó a la conjetura. Mientras tanto, independientemente, nuevas ramas de las matemáticas se desarrollaban. La geometría algebraica y el análisis complejo permitieron a Andrew Wiles resolver finalmente la conjetura. La solución involucra, entre otras herramientas, el uso de curvas elípticas. Esto es suficiente motivo para estudiarlas. En líneas generales las curvas elípticas son polinomios cúbicos no singulares en dos variables con un punto especial de coordenadas racionales en los que podemos establecer una estructura de grupo. Para ma...
7
tesis de grado
Publicado 2017
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La conjetura de Fermat fue uno de los acertijos matemáticos más misteriosos hasta 1995. El problema fue formulado en 1637 por Pierre de Fermat. Él afirmó saber cómo resolverlo, sin embargo, no podía mostrar la prueba debido a que el espacio en el margen de su copia de Arithmetica de Diofanto era insuficiente. Desde entonces mucho misticismo rodeó a la conjetura. Mientras tanto, independientemente, nuevas ramas de las matemáticas se desarrollaban. La geometría algebraica y el análisis complejo permitieron a Andrew Wiles resolver finalmente la conjetura. La solución involucra, entre otras herramientas, el uso de curvas elípticas. Esto es suficiente motivo para estudiarlas. En líneas generales las curvas elípticas son polinomios cúbicos no singulares en dos variables con un punto especial de coordenadas racionales en los que podemos establecer una estructura de grupo. Para ma...
8
artículo
Publicado 2024
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9
artículo
Freshwater algae are considered a very important resource within the food industry due to their high nutritional content and bioactive compounds. This review article aims to address microalgae and macroalgae as alternative/complementary protein sources and explore their potential applications in food products. The main types of freshwater microalgae (including cyanobacteria such as Arthrosporic and green algae such as Chlorella, Scenedesmus, and Haematococcus) are described, their morphology, ecological relevance, and applications (food, nutraceutical, and industrial). Likewise, the extraction and application methods of their components (conventional, ultrasonic, Soxhlet, microwave, CO2 (SFE) are detailed, comparing principles, operating parameters, yields, and benefits for the industry. The proximate and micronutrient composition of each algae (proteins, carbohydrates, lipids, ash, mois...
10
artículo
Publicado 2024
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The aim of this research was to review the psychometric properties of the Frost Multidimensional Perfectionism Scale(FMPS) in a non-clinical sample of 1,242 Mexican adults. The reliability and validity of the scale were assessed usingfactorial analyses, and Cronbach’s alpha (α) and McDonald’s omega (ω) indices were analyzed. The overall reliabilityof the scale was excellent (α = .928, ω = .928), with specific dimensions ranging from acceptable to excellent (concernover mistakes: α = .899, ω = .903; organization: α = .892, ω = .896). Exploratory factor analysis confirmed theadequacy of the data (KMO = .940, p < .001), with the final model fitting with five factors explaining 59.390% of thevariance. Confirmatory factor analysis yielded an RMSEA of .074, CMIN/DF of 7.882, GFI of .849, and CFI of .871,indicating acceptable but not excellent fit. These results suggest that the ...
11
artículo
Publicado 2024
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The aim of this research was to review the psychometric properties of the Frost Multidimensional Perfectionism Scale(FMPS) in a non-clinical sample of 1,242 Mexican adults. The reliability and validity of the scale were assessed usingfactorial analyses, and Cronbach’s alpha (α) and McDonald’s omega (ω) indices were analyzed. The overall reliabilityof the scale was excellent (α = .928, ω = .928), with specific dimensions ranging from acceptable to excellent (concernover mistakes: α = .899, ω = .903; organization: α = .892, ω = .896). Exploratory factor analysis confirmed theadequacy of the data (KMO = .940, p < .001), with the final model fitting with five factors explaining 59.390% of thevariance. Confirmatory factor analysis yielded an RMSEA of .074, CMIN/DF of 7.882, GFI of .849, and CFI of .871,indicating acceptable but not excellent fit. These results suggest that the ...
12
artículo
Publicado 2020
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The present investigation was oriented to establish the psychometric properties of the Inventory of ambivalent sexism (ASI) in young people from technical educational institutions of the Huaral district, the type of study that was used was instrumental, we worked with a census sample, which included 1000 students, from ages between 18 to 30 years. The inventory items analysis was performed, yielding values greater than 0.3, the exploratory factor analysis (EFA) was performed, where the union of 5 factors was demonstrated, which show 51.1% of the total variance. the confirmatory factor analysis (CFA) of the second order, where good adjustment indices are evident, in addition, an adequate inventory reliability was obtained, Cronbach's alpha coefficient of 0.868 and Omega coefficient of 0.869. In conclusion, it was established that the ASI has adequate psychometric properties, and it turns ...
13
artículo
Publicado 2016
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In this paper we present the study to obtain biopolymers from potato starch, for use as a food packaging, starch with acetic acid was changed to 5% yielding a polymer with a 61.76% amylose and 38.28% amylopectin. The elongation and tensile tests showed that the modified starch presented better mechanical property. Also, additives were added to the films by modified starch for to make the film improved mechanical properties and texture for this to Xathan Chitosan and were used in different ratios, determining an improved mechanical property of the biopolymer were prepared. This was corroborated by elongation and tensile tests, yielding values of 33% and 8.47 N respectively and the Infrared spectroscopy -vis made Uv showing characteristic peaks biopolymers cellulose and good transmittance of 87%. All samples were obtained following the Taguchi method.
14
artículo
The study aimed to explore the psychometric properties of research competency scales published in the scientific literature in seven databases: Scopus, Web Of Science, ERIC, Embase, EBSCO, PubMed and SciELO between 2014 and June 2023. Thirteen papers were systematized, where 11 scales were found that measured content validity using indexes such as the S-CVI, Aiken's V and item-test correlations. Similarly, the results of the exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) presented adequate fit indices such as CFI, GFI, TLI, SRMR and RMSEA, which validated the factor structure. Reliability was mostly evaluated through Cronbach's Alpha coefficient, yielding high and consistent values. In addition, coefficients such as McDonald's Omega, ordinal Omega, Guttman and Spearman Brown have been used, all reflecting a value above .70 and internal consistency in the measure...
15
artículo
Publicado 2022
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The Peruvian Altiplano presents increasing fertility losses, being susceptible to natural erosion. For many years, conventional agricultural management has generated losses of the topsoil and deterioration of soil properties, impacting in crop yields and deepening the degradation of this vulnerable ecosystem. The aim of this research was to determine the benefits of cover crops against erosion, soil health and quinoa yield. The trial was carried out in Huancarani and Cahualla towns, Mañazo district, Puno; with a randomized complete block design (RCBD) with four treatments: without cover and with clover (Medicago hispida G.), vetch (Vicia villosa) and mulch covers. We evaluated the physical, chemical, and biological characteristics of soil, the biomass of the cover crops and the quinoa yield. The results showed that the treatments with clover, mulch and vetch covers reduced soil erosion ...
16
artículo
Publicado 2021
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The oil of debittered and dehulled grains from two Andean lupins (Lupinus mutabilis) from Peru, Andenes and Común, was extracted by expeller press. The extraction yield and the proximal composition of both varieties were assessed. The oil and the cake, as well as the defatted flour from the variety with the highest extraction yield, were characterised for physico-chemical properties, total polyphenol content and antioxidant capacity. The oil shelf-life at 25 °C was extrapolated by Rancimat test. Andenes presented an oil yield of 22.1% (vs. 18.4% of Común), CIELAB colour coordinates of L* = 36.5, a* = 2.2, b* = 20, refractive index and density at 25 ºC of 1.469 and 0.903 g/mL, acid number of 3.2 mg KOH/g, free fatty acids content of 1.6%, peroxide number of 2.7 meqO2/kg, p-anisidine number of 1.3, unsaponificable content of 58%, total antioxidant capacity 21.4 µmol TE/g and total pol...
17
artículo
Publicado 2021
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The oil of debittered and dehulled grains from two Andean lupins (Lupinus mutabilis) from Peru, Andenes and Común, was extracted by expeller press. The extraction yield and the proximal composition of both varieties were assessed. The oil and the cake, as well as the defatted flour from the variety with the highest extraction yield, were characterised for physico-chemical properties, total polyphenol content and antioxidant capacity. The oil shelf-life at 25 °C was extrapolated by Rancimat test. Andenes presented an oil yield of 22.1% (vs. 18.4% of Común), CIELAB colour coordinates of L* = 36.5, a* = 2.2, b* = 20, refractive index and density at 25 ºC of 1.469 and 0.903 g/mL, acid number of 3.2 mg KOH/g, free fatty acids content of 1.6%, peroxide number of 2.7 meqO2/kg, p-anisidine number of 1.3, unsaponificable content of 58%, total antioxidant capacity 21.4 µmol TE/g and total pol...
18
artículo
Publicado 2025
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This study explored the psychometric properties of the Spanish version of the Self-Regulation Questionnaire Reading Motivation (SRQ-Reading Motivation) in the context of academic reading, specifically, in the school library. Participants were 235 students enrolled in fourth or fifth grade at a private school in Lima. This study analyzed the internal structure of the scale by means of confirmatory factor analysis. Results yielded a two-factor model indicating autonomous and controlled reading motivation. Findings obtained from convergent and discriminant validity were consistent with those expected. The reliability of the scores obtained in the scales was also adequate. Results and implications are discussed grounded in Self-Determination Theory’s bright and dark side of motivation.
19
artículo
Publicado 2024
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El objetivo de este estudio es conocer el efecto de los abonos orgánicos sobre el crecimiento y la productividad del maíz amarillo y las propiedades del suelo salino. El experimento se llevó a cabo en la granja de Sayeed Habib Al-Khatib en la ciudad de Numaniyah a 45 km al oeste de la ciudad de Kut durante la temporada agrícola de 2024. Para estudiar 3 tipos de residuos orgánicos: vacas, F1, ovejas F2, y aves de corral F3, a continuación, una mezcla de ellos, (F1 + F2), (F1 + F3), (F2 + F3), para conocer el efecto de estos fertilizantes en el crecimiento y la producción de plantas de maíz y las propiedades del suelo. La tierra se aró, se trituró y se mezcló, después se añadieron los residuos al suelo con la capa superficial 2 t.ha-1, a continuación se plantaron los granos de maíz y se empezó a regar hasta el final del experimento. Las operaciones agrícolas y el servicio ...
20
artículo
Publicado 2016
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The potato (Solanum tuberosum) is an important source of starch which is underused in Peru, as are mainly imported potato starch, for has not been achieved yet, industrialization starch extraction is a success. This study aimed to obtain, characterize and modify chemically by acetylation, starch of a commercial potato variety, Unique. Extraction was performed with water and chemical modification was performed by acetylation using acetic anhydride at different levels (% v/w starch): 5, 10 y 15%. Native starch and modified starch were characterized: proximate composition, clear gel, apparent viscosity and stability to the freeze, also the percentage of acetyl groups (GA) was measured. The extraction yield was 16.5% and the apparent viscosity of native potato starch was 25000 mPas. Also starch modified with 15% acetylation for application in a cream ice cream because of their functional ...
