Loeselia campechiana (Polemoniaceae) una especie rara y amenazada de Campeche (México)

CELSO GUTIERREZ BAEZ RODRIGO STEFANO DUNO PEDRO ZAMORA CRESCENCIO (2023, [Artículo])

Loeselia campechiana C. Gut. Báez & R. Duno (Polemoniaceae), es una especie descrita del estado de Campeche (México) en el año 2015. Es una especie rara, se conoce solamente de una localidad de selva mediana subcaducifolia en el ejido de Mucuychakán. Esta especie se distingue por tener brácteas florales cortas, el tubo de la corola recto, los filamentos y el estilo también cortos. Con relación a su estado de conservación, la especie se considera en Peligro Crítico (CR por sus siglas en inglés).

ERICALES PENINSULA DE YUCATAN SELVA MEDIANA SUBCADUCIFOLIA TREN MAYA BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA VEGETAL (BOTÁNICA) ECOLOGÍA VEGETAL ECOLOGÍA VEGETAL

Aproximación de señales acústicas a través de funciones polinomiales

Approximation of acoustic signals through polynomial functions

Andrea Cruz Rojas (2023, [Tesis de maestría])

Las señales acústicas presentan diversas características, como la frecuencia, amplitud y duración. Existen varias formas de representar una señal acústica, siendo la representación en el dominio del tiempo la más común. Esta representación permite visualizar la variación de la amplitud a lo largo del tiempo, analizar la duración, la forma de onda y los cambios rápidos o lentos en la amplitud. Sin embargo, las señales acústicas pueden contener un gran número de elementos, lo que resulta en archivos digitales de gran tamaño que dificultan su envío y almacenamiento. En este trabajo, se llevó a cabo un estudio de aproximación de señales acústicas utilizando diversas funciones polinomiales, como las funciones Zernike, Bessel y Jinc para reducir la cantidad de datos necesarios para representar la señal acústica, lo que simplifica la manipulación de dichos datos. El objetivo es identificar qué polinomio y cuántos coeficientes ofrecen un mejor rendimiento, es decir, una mejor señal acústica. Este estudio se basa en una evaluación objetiva y subjetiva de la reconstrucción de las señales acústicas, lo cual, hasta donde tenemos conocimiento, no se ha estudiado utilizando ambas metodologías en conjunto.

Acoustic signals have various characteristics, such as frequency, amplitude and duration. There are several ways to represent an acoustic signal, with time domain representation being the most common. This representation allows you to visualize the variation of the amplitude over time, analyze the duration, the waveform and the fast or slow changes in the amplitude. However, acoustic signals can contain a large number of elements, resulting in large digital files that make them difficult to send and store. In this work, an approximation study of acoustic signals was carried out using various polynomial functions, such as the Zernike, Bessel and Jinc functions to reduce the amount of data necessary to represent the acoustic signal, which simplifies the manipulation of said data. The objective is to identify which polynomial and how many coefficients offer better performance, that is, a better acoustic signal. This study is based on an objective and subjective evaluation of the reconstruction of acoustic signals, which, to the best of our knowledge, has not been studied using both methodologies together.

Calidad de audio, Compresión de señal acústica, Polinomios ortogonales, Pruebas objetivas y subjetivas. Audio quality, Acoustic signal compression, Orthogonal polynomials, Objective and Subjective Tests INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE LAS TELECOMUNICACIONES ELECTROACÚSTICA ELECTROACÚSTICA

Multiple approaches to understanding the taxonomic status of an enigmatic new scorpion species of the genus Tityus (Buthidae) from the biogeographic island of Paraje Tres Cerros (Argentina)

Andres Alejandro Ojanguren Affilastro (2017, [Artículo])

Tityus curupi n. sp., belonging to the bolivianus complex, is described from the biogeographically distinct area of Paraje Tres Cerros in north-eastern Argentina. We also present a molecular species delimitation analysis between Tityus curupi n. sp. and its sister species Tityus uruguayensis Borelli 1901 to confirm species integrity. Furthermore, a cytogenetic analysis is presented for these two species which contain different multivalent associations in meiosis, as a consequence of chromosome rearrangements, and the highest chromosome numbers in the genus. © 2017 Ojanguren-Affilastro et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Argentina, chromosome analysis, chromosome rearrangement, genus, human, meiosis, sister, species, anatomy and histology, animal, Argentina, chemistry, chromosome, classification, ecosystem, fluorescence in situ hybridization, genetics, geography, isl BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA DE INSECTOS (ENTOMOLOGÍA) BIOLOGÍA DE INSECTOS (ENTOMOLOGÍA)

Dual function of EDTA with silver nanoparticles for root canal treatment–A novel modification

JUAN MANUEL MARTINEZ ANDRADE (2018, [Artículo])

The chelating and antimicrobial capacity of a novel modification of 17% EDTA with silver nanoparticles (AgNPs) (EDTA-AgNPs) was evaluated in-vitro for root canal treatment (RCT). The EDTA-AgNPs solution was characterized by UV-Vis spectroscopy, ?-potential and high-resolution transmission electron microscopy (HRTEM). Antimicrobial capacity was evaluated against Candida albicans and Staphylococcus aureus in planktonic and biofilm cells by broth macrodilution (24 h) and XTT assays, (1, 10 and 30 min) respectively. The chelating capacity of EDTA-AgNPs was assessed indirectly (smear layer removal) and directly (demineralizing effect) in bovine dentin at two silver concentrations, 16 and 512 ?g/ ml at 1 and 10 minutes of exposure time. Smear layer removal was evaluated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The demineralizing effect was determined by atomic absorption spectroscopy (AAS), microhardness test (MH) and X-ray diffractometer (XRD). Synthesized AgNPs were quasi-spherical in shape with an average size of 13.09 ± 8.05 nm. 17% EDTA-AgNPs was effective to inhibit C. albicans and S. aureus in planktonic and biofilm cultures. The smear layer removal and demineralizing effect were similar between 17% EDTA-AgNPs and 17% EDTA treatments. The 17% EDTA-AgNPs solution proved to be an effective antimicrobial agent, and has a similar chelating capacity to 17% EDTA alone. These in-vitro studies strongly suggest that EDTA-AgNPs could be used for effective smear layer removal, having an antimicrobial effect at the same time during RCT. © 2018 Martinez-Andrade et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

edetic acid, silver nanoparticle, edetic acid, metal nanoparticle, silver, antibacterial activity, antibiotic sensitivity, antifungal activity, antimicrobial activity, Article, atomic absorption spectrometry, atomic force microscopy, biofilm, bovine, BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA MICROBIOLOGÍA MICROBIOLOGÍA

La flora electrónica de México “eFloraMEX”: un sueño para los botánicos

MARIA VICTORIA SOSA ORTEGA Diego Angulo (2023, [Artículo])

La flora electrónica de México “eFloraMEX” documenta las especies de plantas vasculares nativas. Para iniciarla, se publicó en su portal la lista florística con aproximadamente 29,000 especies, representando el punto de partida del proyecto. La flora electrónica de México contendrá información e imágenes sobre las especies, así como claves de identificación y tratamientos taxonómicos. Taxónomos especialistas en grupos de plantas colaborarán en su desarrollo, coordinados por los comités editorial, ejecutivo y bioinformático. La eFloraMEX es un esfuerzo conjunto, por lo que cualquier taxónomo o institución interesada podrá participar.

BIODIVERSIDAD PLANTAS NATIVAS PLANTAS VASCULARES TAXONOMIA BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA VEGETAL (BOTÁNICA) TAXONOMÍA VEGETAL TAXONOMÍA VEGETAL

Factores determinantes en la estructuración de la comunidad de murciélagos en la Sierra de Omoa, Honduras

ALEX EMILIO VALLEJO HAM (2023, [Tesis de maestría])

BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA ANIMAL (ZOOLOGÍA) ECOLOGÍA ANIMAL ECOLOGÍA ANIMAL

Análisis isotópico en plumas del Charrán mínimo (Sternula antillarum) para inferir su ecología trófica

Isotope analysis in feathers of the Least Tern (Sternula antillarum) to infer its trophic ecology

Andehui Danay Morales Flores (2024, [Tesis de maestría])

El análisis isotópico de plumas primarias utilizando las razones isotópicas δ13C y δ15N permitió estimar la amplitud y superposición del nicho trófico de los conjuntos de las colonias reproductivas de adultos y volantones del charrán mínimo. Se infirió la amplitud del nicho por medio del área de la elipse estándar estimada por métodos Bayesianos (SEAB), se encontró que existen diferencias entre el nicho trófico de adultos y volantones, pues los adultos tienen valores de la media SEAB de 16.3‰2 hasta 28.4‰2 y los volantones de 44.8‰2 hasta 75.5‰2, esto podría ser debido a diferencias en cuanto a las presas seleccionadas y la ubicación geográfica de los adultos durante la muda de las primarias. Por otro lado, la superposición del nicho indicó la similitud entre los adultos de diferentes colonias, por lo cual, se consideró que los adultos de algunas colonias podrían compartir un sitio de invernada o bien la temporalidad en la muda de las primarias. Además, se cumplió con el objetivo de caracterizar la variabilidad de las firmas isotópicas de carbono y nitrógeno durante el crecimiento secuencial de las plumas primarias por medio de los modelos aditivos generalizados y se observó la variabilidad entre las primarias utilizando las anomalías respecto a la media local de cada colonia, lo cual permitió diferenciar estrategias de alimentación específicas para ciertos conjuntos y la variabilidad en la dieta. La búsqueda bibliográfica de los sitios potenciales de migración en invierno más los mapas de gradientes isotópicos de δ13C permitió determinar que el Océano Pacífico Oriental Tropical es la región geográfica relacionada con la distribución δ13C en plumas primarias del charrán mínimo y es el sitio más probable de invernada.

The isotopic analysis of primary feathers using the isotopic ratios of δ13C and δ15N allowed the estimation of the breadth and overlap of the trophic niche of adult and fledgling least terns. Niche breadth was inferred through the standard ellipse area (SEAB) estimated by Bayesian methods. We found differences between the trophic niche of adults and fledglings, as adults presented mean SEAB values from 16.3‰2 to 28.4‰2 and fledglings from 44.8‰2 to 75.5‰2. This could be due to differences in the prey selected and the geographical location of the adults during the molt of the primaries. The overlap of these values among adults indicates similarity in prey selection and location between the adults of different colonies. Therefore, it was considered that the adults of some colonies could share a wintering site during the period of molt of the primary feathers. We characterized the variability of carbon and nitrogen isotopic signatures during the sequential growth of primary feathers through generalized additive models and the variability between primaries using the anomalies of these signatures and the local mean for each colony. This allowed us to differentiate specific feeding strategies of individual least terns and the variability in their diet. The bibliographic search for potential migration and wintering sites found published maps of δ13C isotopic gradients in the Tropical Eastern Pacific Ocean that correspond to the δ13C distribution in primary feathers of the least tern, indicating a potential wintering area for this species.

isótopos, carbono, nitrógeno, ave marina, ecología trófica isotopes, seabird, nitrogen, carbon, trophic ecology BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA VEGETAL (BOTÁNICA) ECOLOGÍA VEGETAL ECOLOGÍA VEGETAL

Corrigendum: The sole DNA ligase in Entamoeba histolytica is a high-fidelity DNA ligase involved in DNA damage repair

ELISA IRENE AZUARA LICEAGA Abigail Betanzos CESAR SALVADOR CARDONA FELIX ELIZABETH JACQUELINE CASTAÑEDA ORTIZ HELIOS CARDENAS HERNANDEZ ROSA ELENA CARDENAS GUERRA GUILLERMO PASTOR PALACIOS GUILLERMINA GARCIA RIVERA DAVID HERNANDEZ ALVAREZ CARLOS HUMBERTO TRASVIÑA ARENAS Corina Diaz Quezada Esther Orozco Luis Gabriel Brieba de Castro (2022, [Artículo])

"A Corrigendum on

The soleDNA ligase in Entamoeba histolytica is a high-fidelity DNA ligase involved in DNA damage repair

By Azuara-Liceaga E, Betanzos A, Cardona-Felix CS, Castañeda-Ortiz EJ, Cárdenas H, Cárdenas-Guerra RE, Pastor-Palacios G, García-Rivera G, Hernández-Álvarez D, Trasviña-Arenas CH, Diaz-Quezada C, Orozco E and Brieba LG (2018) Front. Cell. Infect. Microbiol. 8:214. doi: 10.3389/fcimb.2018.00214"

EhDNAlig Protozoan DNA insults Ligation Repairing 8-oxoG adduct NER and BER pathways BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA MICROBIOLOGÍA MICROBIOLOGÍA

Review of Nationally Determined Contributions (NCD) of China from the perspective of food systems

Tek Sapkota (2023, [Documento de trabajo])

China is the largest emitter of greenhouse gases (GHG) and one of the countries most affected by climate change. China's food systems are a major contributor to climate change: in 2018, China's food systems emitted 1.09 billion tons of carbondioxide equivalent (CO2eq) GHGs, accounting for 8.2% of total national GHG emissions and 2% of global emissions. According to the Third National Communication (TNC) Report, in 2010, GHG emissions from energy, industrial processes, agriculture, and waste accounted for 78.6%, 12.3%, 7.9%, and 1.2% of total emissions, respectively, (excluding emissions from land use, land-use change and forestry (LULUCF). Total GHG emissions from the waste sector in 2010 were 132 Mt CO2 eq, with municipal solid waste landfills accounting for 56 Mt. The average temperature in China has risen by 1.1°C over the last century (1908–2007), while nationally averaged precipitation amounts have increased significantly over the last 50 years. The sea level and sea surface temperature have risen by 90 mm and 0.9°C respectively in the last 30 years. A regional climate model predicted an annual mean temperature increase of 1.3–2.1°C by 2020 (2.3–3.3°C by 2050), while another model predicted a 1–1.6°C temperature increase and a 3.3–3.7 percent increase in precipitation between 2011 and 2020, depending on the emissions scenario. By 2030, sea level rise along coastal areas could be 0.01–0.16 meters, increasing the likelihood of flooding and intensified storm surges and causing the degradation of wetlands, mangroves, and coral reefs. Addressing climate change is a common human cause, and China places a high value on combating climate change. Climate change has been incorporated into national economic and social development plans, with equal emphasis on mitigation and adaptation to climate change, including an updated Nationally Determined Contribution (NDC) in 2021. The following overarching targets are included in China's updated NDC: • Peaking carbon dioxide emissions “before 2030” and achieving carbon neutrality before 2060. • Lowering carbon intensity by “over 65%” by 2030 from the 2005 level. • Increasing forest stock volume by around 6 billion cubic meters in 2030 from the 2005 level. The targets have come from several commitments made at various events, while China has explained very well the process adopted to produce its third national communication report. An examination of China's NDC reveals that it has failed to establish quantifiable and measurable targets in the agricultural sectors. According to the analysis of the breakdown of food systems and their inclusion in the NDC, the majority of food system activities are poorly mentioned. China's interventions or ambitions in this sector have received very little attention. The adaptation component is mentioned in the NDC, but is not found to be sector-specific or comprehensive. A few studies have rated the Chinese NDC as insufficient, one of the reasons being its failure to list the breakdown of each sector's clear pathway to achieving its goals. China's NDC lacks quantified data on food system sub-sectors. Climate Action Trackers' "Insufficient" rating indicates that China's domestic target for 2030 requires significant improvements to be consistent with the Paris Agreement's target of 1.5°C temperature limit. Some efforts are being made: for example, scientists from the Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences (IEDA-CAAS) have developed methods for calculating GHG emissions from livestock and poultry farmers that have been published as an industrial standard by the Ministry of Agriculture and Rural Affairs, PRC (Prof Hongmin Dong, personal communication) but this still needs to be consolidated and linked to China’s NDC. The updated Nationally Determined Contributions fall short of quantifiable targets in agriculture and food systems as a whole, necessitating clear pathways. China's NDC is found to be heavily focused on a few sectors, including energy, transportation, and urban-rural development. The agricultural sectors' and food systems' targets are vague, and China's agrifood system has a large carbon footprint. As a result, China should focus on managing the food system (production, processing, transportation, and food waste management) to reduce carbon emissions. Furthermore, China should take additional measures to make its climate actions more comprehensive, quantifiable, and measurable, such as setting ambitious and clear targets for the agriculture sector, including activity-specific GHG-reduction pathways; prioritizing food waste and loss reduction and management; promoting sustainable livestock production and low carbon diets; reducing chemical pollution; minimizing the use of fossil fuel in the agri-system and focusing on developing green jobs, technological advancement and promoting climate-smart agriculture; promoting indigenous practices and locally led adaptation; restoring degraded agricultural soils and enhancing cooperation and private partnership. China should also prepare detailed NDC implementation plans including actions and the GHG reduction from conditional targets.

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA GREENHOUSE GAS EMISSIONS CLIMATE CHANGE FOOD SYSTEMS LAND USE CHANGE AGRICULTURE POLICIES DATA ANALYSIS FOOD WASTES

Los médicos costarricenses formados en México durante el cardenismo: retorno e inserción laboral (1934-1961)

Costa Rican doctors trained in Mexico during the Cardenismo: return and labor insertion (1934-1961)

Marco Calderón-Blanco (2021, [Artículo])

El presente trabajo analiza el retorno de los estudiantes costarricenses que viajaron a México durante el cardenismo para cursar la carrera de medicina, con el fin de determinar su inserción laboral en el sistema de salud costarricense entre las décadas de 1940 y 1960. Se exploran las circunstancias que giraron alrededor del retorno y la inserción laboral de dichos profesionales. Al respecto, se evidencia que la integración a la fuerza de trabajo en el Hospital San Juan de Dios permitió un rápido ascenso en el escalafón médico. Esta dinámica posibilitó que un número considerable de los médicos tratados en el presente estudio ocupara puestos de poder en instituciones de salud costarricenses, situación que llevó a que se integraran al proceso de creación de la Escuela de Medicina de la Universidad de Costa Rica, la cual entró en funciones en el año de 1961.

The present work analyzes the return of Costa Rican students who traveled to Mexico during the cardenismo period to study medicine, in order to determine their labor insertion in the Costa Rican health system between the 1940s and 1960s. The circumstances surrounding the return and work insertion of these professionals are explored. In this regard, it is evident that the integration to the workforce of the San Juan de Dios Hospital allowed a rapid ascent in the medical ladder. This dynamic made it possible for a considerable number of the doctors treated in this study to hold positions of power in Costa Rican health institutions, a situation that led to their integration into the process of creating the University of Costa Rica’s School of Medicine, which became operational in 1961.

HUMANIDADES Y CIENCIAS DE LA CONDUCTA Medicina social Médicos costarricenses Cardenismo Retorno Inserción laboral Social medicine Costa Rican doctors Lázaro Cardenas government Return Labor insertion