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nuevos cultivares en la Empresa Azucarera “5 de septiembre”, el objetivo general consistió en realizar el estudio de B80250, C86-156 y C97-445, para mejorar la estructura de dichos cultivares. El experimento se estableció en marzo de 2021 en la localidad La Julia (N 22º 25' 2,2064” W -80º 30’ 1,152”), suelo Pardo con carbonatos y las evaluaciones correspondieron a la cosecha de planta con 12 meses, en las que se tuvo en cuenta el rendimiento agrícola, contenido azucarero y otros indicadores de la eficiencia industrial. Quedó corroborado que C97-445 y C86-156 por sus potenciales agroindustriales y seguridad fitosanitaria, pueden ser la solución de la riesgosa explotación actual de C86-12 y C90-469. Se recomienda dar continuidad al trabajo en otras cosechas y a partir de la experiencia implementar estudios similares con otros cultivares y ambientes. El enfoque teórico asumido es de carácter cuantitativo, con el empleo de una metodología experimental y se dan a conocer los resultados de la investigación.

Uncertainty in ecosystem restoration can be mitigated by information on drivers of variability in restoration outcomes, especially through experimental study. In southeastern USA pine savannas, efforts to restore the perennial bunchgrass wiregrass (Aristida beyrichiana) often achieve variable outcomes in the first year. Although ecotypic differentiation and competition with other native vegetation are known to influence wiregrass seedling establishment and growth, to our knowledge, no studies have examined interactions between these drivers. We experimentally quantified individual and interactive effects of competition, seed source, and soil type on wiregrass density, size, and flowering culm production in the field. We sowed seeds from dry and wet sites reciprocally into dry and wet soils and weeded half of the plots. We found that competition removal resulted in significantly larger plants and a greater proportion of flowering plants with more culms on average, regardless of seed source or soil type. Seeds sourced from a wet site resulted in more plants per plot than seeds from a dry site, which might have been influenced by the greater number of filled seeds from the wet site. After seedlings become established, competition contributes to variation in growth and reproduction. Although competition removal could help start wiregrass populations, the necessity of mitigation depends on fire management needs. [ABSTRACT FROM AUTHOR]

We researched how the transition to remote learning during the COVID-19 pandemic affected the development of mathematical thinking and reading comprehension skills of high school students based on the analysis of the results of a standardized test for higher education admission. The total number of participants was N = 17,942, out of which N1 = 10,611 were pre-pandemic applicants and N2 = 7,331 were post-pandemic applicants. The pre-pandemic group took into consideration the exam results from September 2016 to June 2020. The post-pandemic group took into consideration the exam results from September 2020 up to May 2023. We conclude that emergency remote teaching decreased the average mathematical competence of incoming university students by 12.8%. Similarly, emergency remote teaching decreased the average reading achievement of students entering university by 8%. Therefore, the impact of emergency remote teaching was greater on mathematics skills than on reading achievements. [ABSTRACT FROM AUTHOR]

Introduction: Despite its crucial role in Epidermal Growth Factor Receptor (EGFR) activation, and the resulting impact on the health‐disease process, epidermal growth factor (EGF) is an underexplored molecule in relation to how its serum concentrations relate to other analytes and clinical variables in pathological contexts. Objective: To clarify the possible correlation between EGF and clinical and analytical variables in the context of COVID‐19. Methods: Cross‐sectional observational and analytical study, in patients with virological and clinical diagnosis of COVID‐19, selected by simple random sampling, admitted between August and September 2021. UMELISA‐EGF commercial kits were used. Results: Differences in overall EGF values were observed between groups (566.04 vs. 910.53 pg/ml, p =.0430). In COVID‐19 patients, no notable correlations were observed for neutrophil, platelet, triglyceride or liver enzyme values (p >.05). Significant correlations were observed with the neutrophil‐lymphocyte indicator (r = 0.4711, p =.0128) as well as with the platelet‐lymphocyte index (r = 0.4553, p =.0155). Statistical results of multivariate regression analysis suggest NLR (β =.2232, p =.0353) and PLR (β =.2117, p =.0411) are predictors of inflammation in patients with COVID‐19. Conclusions: Serum EGF concentrations in COVID‐19 correlate positively with prognostic inflammatory markers of severity and could presumably act as an independent risk factor for the development of inflammation in response to new severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2). [ABSTRACT FROM AUTHOR]

This study evaluates the antimicrobial efficacy of chitosan nanoparticles (CNPs), varying in size, against clinical isolates of Mycobacterium tuberculosis (MTB), E. coli, S. aureus, E. faecalis, and C. albicans, as well as the antimicrobial effects of aqueous extracts and lyophilized powders of Allium (garlic) species. CNPs were synthesized through ionotropic gelation and characterized by Z potential, hydrodynamic diameter (dynamic light scattering, DLS), and SEM. Aqueous garlic extracts were prepared via decoction. We assessed antimicrobial activity using disk diffusion and broth microdilution methods; in addition, a modified agar proportion method in blood agar was used for antimicrobial activity against MTB. CNPs inhibited MTB growth at 300 μg for 116.6 nm particles and 400 μg for 364.4 nm particles. The highest antimicrobial activity was observed against E. faecalis with nanoparticles between 200 and 280 nm. Allium sativum extract produced inhibition for C. albicans at 100 μg. The results indicate that CNPs possess significant antimicrobial properties against a range of pathogens, including MTB, at high concentrations. On the other hand, aqueous Allium sativum extracts exhibited antimicrobial activity. Nonetheless, due to their instability in solution, the use of lyophilized Allium sativum powder is preferable. [ABSTRACT FROM AUTHOR]

El comportamiento del cultivar C86-12 se validó en la Unidad Básica de Producción Cooperativa “La Josefa”, de la provincia Cienfuegos. Se consideraron los resultados cinco cosechas, la dinámica de maduración desde noviembre hasta abril y el monitoreo fitosanitario de roya, carbón y el virus del amarillamiento foliar, respecto al control C1051-73; de dos experimentos de primavera de ciclo largo y frío, que se tuvieron en cuenta en la fase de discusión participativa de la propuesta del Servicio de Variedades y Semilla. Se emplearon técnicas estadísticas de análisis de varianza, comparación múltiple de medias y regresión polinómica de segundo orden, en el procesamiento de los datos. Se corroboró que C86-12 posee las cualidades en cuanto a rendimiento agrícola, azucarero, maduración temprana y seguridad fitosanitaria para contribuir a la preservación de C1051-73, mediante su reemplazo en los agroecosistemas de mayor vulnerabilidad y riesgo al virus del amarillamiento foliar, por lo que se proyectó un incremento de desarrollo hasta el año 2022, para ubicarse como la segunda variedad en importancia en dicha unidad.