Situated learning through local stories: positioning socio-ecological concerns, knowledge and practices in school

Rosa Guadalupe Mendoza Zuany Juan Carlos A. Sandoval Rivera Paula Martínez Bautista (2023, [Artículo, Artículo])

The article analyzes the importance of the local stories, which contain concerns, knowledge and practices to look after the socio-ecological environment, to trigger situated and pertinent teaching and learning processes in primary education in rural and indigenous contexts in Veracruz, Mexico. In particular, it focuses on the stories about care in the framework of a deep socio-ecological crisis in two Nahua communities of the Huasteca region. Interview-conversations were carried out with community actors in the two communities in which 32 stories emerged. The analysis allowed the identification of socio-ecological concerns of the community, characteristics of the stories that show their potential in the learning processes, as well as types of knowledge and practices that are rarely considered in the classroom, which are capable of being linked to curricular content, in order to contribute to reflection and action on the socio-ecological crisis of the communities.

aprendizaje narración de historias medio ambiente ambiente socio-cultural escuela rural CIENCIAS SOCIALES; HUMANIDADES Y CIENCIAS DE LA CONDUCTA CIENCIAS SOCIALES HUMANIDADES Y CIENCIAS DE LA CONDUCTA Learning story telling environment socio-cultural environment rural school

Preliminary dissection of grain yield and related traits at differential nitrogen levels in diverse pre-breeding wheat germplasm through association mapping

Achla Sharma Juan Burgueño Prashant Vikram Nitika Sandhu Satinder Kaur Parveen Chhuneja (2023, [Artículo])

Plant Nitrogen Use Efficiency Pre-Breeding Lines Genome-Wide Association Study Marker Trait Association CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA WHEAT PRE-BREEDING BREEDING LINES NITROGEN LANDRACES GENETIC MARKERS

Optimization of N dose in rice under conservation agriculture with sub-surface drip fertigation

C.M. Parihar Hari Sankar Nayak Renu Pandey Avinash Kumar ML JAT (2021, [Artículo])

Biological Yield Economic N Dose Yield Attributes CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA YIELDS NITROGEN ZERO TILLAGE DIRECT SOWING RICE

Low nitrogen narrows down phenotypic diversity in durum wheat

Tesfaye Geleta Aga Bekele Abeyo (2023, [Artículo])

Clusters Durum Wheat Nitrogen Efficiency CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA HARD WHEAT GENETIC DIVERGENCE NORMALIZED DIFFERENCE VEGETATION INDEX NITROGEN PRINCIPAL COMPONENT ANALYSIS

The contribution of strong and weak ties to resilience: The case of small-scale maize farming systems in Mexico

Tania Carolina Camacho Villa Ernesto Adair Zepeda Villarreal Julio Díaz-José Roberto Rendon-Medel Bram Govaerts (2023, [Artículo])

Social Network Analysis Farm Typologies Social Ties Strong Ties CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA INNOVATION NETWORKS PERSISTENCE SOCIAL NETWORK ANALYSIS MAIZE FARMING SYSTEMS

A Novel Technique for Classifying Bird Damage to Rapeseed Plants Based on a Deep Learning Algorithm.

Ali Mirzazadeh Afshin Azizi Yousef Abbaspour_Gilandeh José Luis Hernández-Hernández Mario Hernández Hernández Iván Gallardo Bernal (2021, [Artículo])

Estimation of crop damage plays a vital role in the management of fields in the agricultura sector. An accurate measure of it provides key guidance to support agricultural decision-making systems. The objective of the study was to propose a novel technique for classifying damaged crops based on a state-of-the-art deep learning algorithm. To this end, a dataset of rapeseed field images was gathered from the field after birds¿ attacks. The dataset consisted of three classes including undamaged, partially damaged, and fully damaged crops. Vgg16 and Res-Net50 as pre-trained deep convolutional neural networks were used to classify these classes. The overall classification accuracy reached 93.7% and 98.2% for the Vgg16 and the ResNet50 algorithms, respectively. The results indicated that a deep neural network has a high ability in distinguishing and categorizing different image-based datasets of rapeseed. The findings also revealed a great potential of Deep learning-based models to classify other damaged crops.

rapeseed classification damaged crops deep neural networks INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE LOS ALIMENTOS

Assessment of resistance to cereal cyst nematodes, Heterodera avenae in Moroccan durum and bread wheat elite breeding lines

Abdelfattah DABABAT fouad mokrini (2023, [Artículo])

Durum Wheat Bread Wheat Cereal Cyst Nematodes Nematode Reproduction Factors CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA HETERODERA AVENAE HARD WHEAT SOFT WHEAT NEMATODES RESISTANCE VARIETIES SUSTAINABLE PRODUCTION CEREALS

Estudio de persistencia de la sequía en el norte y centro de México

ISRAEL VELASCO VELASCO Eduardo Alexis Cervantes Carretero DAVID ORTEGA GAUCIN (2013, [Documento de trabajo])

Tabla de contenido: Introducción – Antecedentes – Conceptos y enfoques de la proyección hidrológica a futuro: modelo autorregresivo, modelo de medias móviles, modelo autorregresivo de media móvil – Índices de estado – Índice hidrológico de sequía – Resultados – Conclusiones y recomendaciones.

En el acontecer natural hidrometeorológico, la estimación de eventos futuros tiene un elevado nivel de incertidumbre, tanto más grande en cuanto más a futuro. Sin embargo, algunos de estos fenómenos –la lluvia y el escurrimiento superficial-, pueden mostrar un cierto nivel de persistencia, entendido el término como la continuación de condiciones iguales o similares o del mismo tipo, lo cual se puede tratar con algunas técnicas estadístico-matemáticas, para intentar estimar su comportamiento futuro. Este trabajo incursiona sobre la estimación de la persistencia hidrológica, como un elemento de posible aplicación para apoyar la formulación de escenarios de sequía. Dicho trabajo tiene como fin estudiar, bajo diversos enfoques (Hurst, índices de severidad...), el fenómeno de la persistencia de las sequías y aplicarla a series hidrometeorológicas en alguna cuenca del norte y centro de México.

Introducción – Antecedentes – Conceptos y enfoques de la proyección hidrológica a futuro: modelo autorregresivo, modelo de medias móviles, modelo autorregresivo de media móvil – Índices de estado – Índice hidrológico de sequía – Resultados – Conclusiones y recomendaciones.

Sequía Fenómeno de El Niño Corrientes cálidas Corrientes frías Series hidrometeorológicas Informes de proyectos Presa Lázaro Cárdenas, Durango CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA

Optimization of the alkali-silane treatment of agave lechuguilla fibers (ixtle) for potential reinforcement in polymeric composites

NOEMI JARDON MAXIMINO MARIAMNE DEHONOR GOMEZ Rolando Villa Moreno MARIA DOLORES BAEZA ALVARADO Luis Edmundo Lugo Uribe (2023, [Artículo])

Reinforced polymeric composites with natural fibers have garnered significant interest in recent years due to the need for biomass utilization and the requirements of various industries, such as automotive and construction. Among these natural fibers, Agave lechuguilla fiber, commonly known as ixtle (FIx) or Tampico fiber, exhibits important characteristics such as length, high strength, and durability. However, there is limited literature on its conditioning, functionalization, and utilization as a reinforcing material in polymeric composites (CP). This study presents the optimization of the alkali-silane treatment of FIx, identifying the most suitable reaction conditions to enhance their thermal stability, tensile strength, and silane coupling agent (ACSi) grafting on the fiber surface. The chemical treatment with ACSi proved highly effective, resulting in a significant grafting content, which was confirmed through FTIR and SEM–EDS analyses. The high level of functionalization did not compromise the mechanical performance of the fibers, suggesting that functionalized FIx holds great potential as a reinforcing material in CP. These findings open new paths for the sustainable use of Agave lechuguilla fibers, contributing to the development of environmentally friendly and high-performance polymeric composites in various industrial applications.

This article belongs to the Special Issue Natural Fibers for Advanced Materials: Addressing Challenges).

Supplementary materials: The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/fib11100086/s1, Figure S1: Optical microscope image of ixtle fibers at a magnification of 50 (a) untreated and (b) alkaline treated (FIx-5); Table S1: FTIR signal assignment for alkaline treated FIx; Table S2: FTIR Signal assignment for silane treated FIx.

Author contributions: Conceptualization, N.J.-M. and L.E.L.U.; methodology, N.J.-M., M.D.G., R.V.M., M.D.B.-A. and L.E.L.U.; validation, N.J.-M. and L.E.L.U.; formal analysis, N.J.-M., M.D.G. and L.E.L.U.; investigation, N.J.-M. and L.E.L.U.; data curation, N.J.-M., M.D.G., R.V.M. and M.D.B.-A.; writing—original draft preparation, N.J.-M. and L.E.L.U.; writing—review and editing, N.J.-M., M.D.G., R.V.M., M.D.B.-A. and L.E.L.U.; visualization, N.J.-M., M.D.G. and L.E.L.U.; supervision, L.E.L.U.; project administration, N.J.-M. and L.E.L.U.; funding acquisition, N.J.-M. and L.E.L.U. All authors have read and agreed to the published version of the manuscript.

Funding: This research was funded by CONAHCYT, “Estancias postdoctorales por México”, grant umber CVU425480.

Data availability statement: Data supporting the findings of this study are available within the article and upon request from the corresponding author.

Acknowledgments: The authors express their gratitude towards Rene Diaz Rebollar and Jazmin Gomez Sara for their technical assistance in conducting the chemical reactions presented in this current study. Additionally, the assistance provided by Luis Alberto Caceres Diaz in the execution of XRD analyses is also acknowledged. Furthermore, N.J.M. extends sincere recognition to CIATEQ A.C. for their provision of essential resources and infrastructure crucial to the advancement of this research. The support rendered by CONAHCYT through the “Estancias postdoctorales por México” program is also gratefully acknowledged, as it has contributed financial backing to the project. Conflicts of Interest: The authors declare no conflict of interest.

Agave lechuguilla Natural fiber Silane coupling agent INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS OTRAS OTRAS

Variabilidad estacional de la productividad primaria y su relación con la estratificación vertical en la bahía de La Paz, BCS

Seasonal variability of primary productivity and its relation to the vertical stratification in La Paz, BCS

RAFAEL CERVANTES DUARTE RUBEN ANTELMO MORALES PEREZ JOSE EDUARDO VALDEZ HOLGUIN (2003, [Artículo])

Se estimó la productividad primaria (pp) vía fluorescencia natural en la bahía de La Paz durante octubre de 1996, marzo, abril, mayo, junio, julio, septiembre, noviembre de 1997, y enero de 1998. simultáneamente a los registros de pp se realizaron perfiles verticales de temperatura (CTD) para determinar la estructura de la columna de agua, y de los cuales se estimó el índice de estratificación (_) de 0 a 100 m de profundidad. Durante primavera se observaron los valores promedio más altos de pp (16 mg C m-3 h-1) y valores bajos de _ (50 J m-3) que corresponden a una columna de agua casi homogénea. En contraste, en las subsecuentes estaciones (verano y otoño), la pp decreció a valores mínimos (2 y 5 mg C m-3 h-1), mientras que _ se incrementó significativamente (249 y 347 J m-3). Los resultados indican que existe una dependencia lineal de la pp y la mezcla en la columna de agua (r2 = 0.62, p<0.05) durante los meses de verano. Periodos con una alta estratificación tienden posiblemente a inhibir la fertilización de la capa superficial, mientras que una columna de agua bien mezclada facilita el proceso de fertilización. Por lo tanto, es evidente que en la Bahía de La Paz la estratificación asume un papel importante como mecanismo que controla la pp y explica parcialmente la variabilidad estacional observada en la bahía.

Materia orgánica Producción primaria La Paz Fluorescencia natural BIOLOGÍA Y QUÍMICA