Desigualdades sociales urbano-rurales en la mortalidad por siniestros viales en Colombia, 1998-2019

Introducción: Anualmente se pierden 1,35 millones de vidas por causa de siniestros viales; su ocurrencia se ha relacionado, además de factores comportamentales, con desigualdades sociales. Objetivo: Analizar las desigualdades sociales urbano-rurales en la mortalidad por siniestros viales en Colombia para el periodo 1998-2019. Materiales y métodos: Estudio ecológico a partir del análisis de las tasas de mortalidad ajustadas de los grupos poblacionales urbanos y rurales estratificados por sexo. Se hicieron análisis con regresión de Joinpoint y se calcularon medidas de desigualdad simple absoluta y relativa. Resultados: Se registraron 139 323 muertes por siniestros viales, en Colombia la tasa de mortalidad por esta causa se ha venido reduciendo. En contraste con las áreas rurales, en las áreas urbanas esta reducción es más significativa. Existen desigualdades en la mortalidad entre las áreas urbanas y rurales que han venido estrechándose. No obstante, en el caso de hombres y mujeres ha venido incrementándose. Discusión: La reducción de la tasa de mortalidad por siniestros viales sugiere que las intervenciones en seguridad vial han sido efectivas. La mayor mortalidad en hombres puede explicarse a partir de factores comportamentales. Las desigualdades urbano-rurales pueden estar relacionadas con las dinámicas de desarrollo. Conclusiones: Se registra una reducción en la tasa de mortalidad por siniestros viales, la cual es más significativa en áreas urbanas. Existen desigualdades urbano-rurales en la mortalidad por esta causa. Las políticas de seguridad vial deben partir de un enfoque integrador vinculado con otras agendas políticas.

Introduction: Annually, 1,35 million lives are lost due to road accidents; their occurrence has been related, in addition to behavioral factors, to social inequalities. Objective: To analyze urban-rural social inequalities in mortality from traffic accidents in Colombia from 1998-2019. Methods and materials: Ecological study based on the analysis of standardized mortality rates adjusted for age and sex of urban and rural population groups stratified by sex. Joinpoint regression analyses were performed, and absolute and relative simple inequality measures were calculated. Results: There were 139.323 deaths from road accidents; in Colombia mortality rates from this cause has been decreasing. In urban areas, the reduction is more significant than in rural areas. Disparities in mortality between urban and rural areas have been narrowing, however, in the case of men and women, they have been increasing. Discussion: Reducing the mortality rate from road accidents suggests that road safety interventions have been effective. Behavioral factors can explain the higher mortality in men. Urban-rural inequalities can be related to development dynamics. Conclusions: There is a significant reduction in the mortality rate due to road accidents in urban areas. There are urban-rural inequalities in mortality from this cause. Road safety policies must be based on an integrative approach linked to other political agendas.

Enhancing Osteoblastic Cell Cultures with Gelatin Methacryloyl, Bovine Lactoferrin, and Bioactive Mesoporous Glass Scaffolds Loaded with Distinct Parsley Extracts.

The increasing interest in innovative solutions for addressing bone defects has driven research into the use of Bioactive Mesoporous Glasses (MBGs). These materials, distinguished by their well-ordered mesoporous structure, possess the capability to accommodate plant extracts with well-established osteogenic properties, including bovine lactoferrin (bLF), as part of their 3D scaffold composition. This harmonizes seamlessly with the ongoing advancements in the field of biomedicine. In this study, we fabricated 3D scaffolds utilizing MBGs loaded with extracts from parsley leaves (PL) and embryogenic cultures (EC), rich in bioactive compounds such as apigenin and kaempferol, which hold potential benefits for bone metabolism. Gelatin Methacryloyl (GelMa) served as the polymer, and bLF was included in the formulation. Cytocompatibility, Runx2 gene expression, ALP enzyme activity, and biomineralization were assessed in preosteoblastic MC3T3-E1 cell cultures. MBGs effectively integrated PL and EC extracts with loadings between 22.6 ± 0.1 and 43.6 ± 0.3 µM for PL and 26.3 ± 0.3 and 46.8 ± 0.4 µM for EC, ensuring cell viability through a release percentage between 28.3% and 59.9%. The incorporation of bLF in the 3D scaffold formulation showed significant differences compared to the control in all assays, even at concentrations below 0.2 µM. Combinations, especially PL + bLF at 0.19 µM, demonstrated additive potential, with superior biomineralization compared to EC. In summary, this study highlights the effectiveness of MBGs in incorporating PL and EC extracts, along with bLF, into 3D scaffolds. The results underscore cytocompatibility, osteogenic activity, and biomineralization, offering exciting potential for future in vivo applications.

[Social inequalities related to road traffic mortality]. / Desigualdades sociales relacionadas con la mortalidad por accidentes de tráfico.

OBJECTIVE: To synthesize the social inequalities related to mortality from traffic accidents reported in scientific publications. METHOD: A scoping review following the PRISMA-ScR guide was carried out. Using the MesH vocabulary, we systematically searched for articles in English, Portuguese and Spanish published in the EBSCO, Scielo, Scopus, Ovid, and PubMed databases. RESULTS: We identified 47,790 records in the initial search, of which 35 articles met the selection criteria. Nine out ten publications are in high-income countries; there is a greater interest in analyzing mortality in occupants and drivers of vehicles and motorcyclists. Half of the publications use race-ethnicity and geolocation as socioeconomic position variables. The articles included in this review indicate that groups of people with low socioeconomic positions have higher mortality due to traffic accidents. CONCLUSIONS: The highest mortality from traffic accidents occurs in people with low socioeconomic positions which suggests the development of road safety actions from a comprehensive, integrative perspective and linked to other political agendas to reduce their incidence by 2030. Although road traffic fatalities are higher in low and middle-income countries, few publications are available in these countries. It is necessary to strengthen the research capacities in these countries.

Desigualdades sociales relacionadas con la mortalidad por accidentes de tráfico / Social inequalities related to road traffic mortality

Objetivo: Sintetizar las desigualdades sociales relacionadas con la mortalidad por accidentes de tráfico reportadas en publicaciones científicas. Método: Se realizó una revisión exploratoria de la literatura siguiendo la guía PRISMA-ScR. Utilizando el vocabulario MesH se hizo una búsqueda sistemática de artículos publicados en inglés, portugués y español en las bases de datos EBSCO, Scielo, Scopus, Ovid y PubMed. Resultados: Se identificaron 47.790 registros en la búsqueda inicial, de los cuales 35 artículos cumplieron los criterios de selección. Nueve de cada diez publicaciones son de países de altos ingresos y existe un mayor interés en el análisis de la mortalidad en ocupantes y conductores de automotores. La mitad de las publicaciones utilizan la raza, la etnia y la geolocalización como variables de posición socioeconómica. Los artículos incluidos en esta revisión indican que las agrupaciones de personas de baja posición socioeconómica presentan una mayor mortalidad por accidentes de tránsito. Conclusiones: La mayor mortalidad por accidentes de tránsito se presenta en personas de baja posición socioeconómica, lo que sugiere el desarrollo de acciones de seguridad vial que estén vinculadas con otras agendas políticas a fin de reducir su incidencia para 2030. A pesar de que la mortalidad por accidentes de tránsito es mayor en los países de medianos y bajos ingresos, son pocas las publicaciones realizadas en ellos, por lo que se requiere fortalecer las capacidades de investigación en tales países.(AU)

Objective: To synthesize the social inequalities related to mortality from traffic accidents reported in scientific publications. Method: A scoping review following the PRISMA-ScR guide was carried out. Using the MesH vocabulary, we systematically searched for articles in English, Portuguese and Spanish published in the EBSCO, Scielo, Scopus, Ovid, and PubMed databases. Results: We identified 47,790 records in the initial search, of which 35 articles met the selection criteria. Nine out ten publications are in high-income countries; there is a greater interest in analyzing mortality in occupants and drivers of vehicles and motorcyclists. Half of the publications use race-ethnicity and geolocation as socioeconomic position variables. The articles included in this review indicate that groups of people with low socioeconomic positions have higher mortality due to traffic accidents. Conclusions: The highest mortality from traffic accidents occurs in people with low socioeconomic positions which suggests the development of road safety actions from a comprehensive, integrative perspective and linked to other political agendas to reduce their incidence by 2030. Although road traffic fatalities are higher in low and middle-income countries, few publications are available in these countries. It is necessary to strengthen the research capacities in these countries.(AU)

Antimicrobial and antioxidant activity of proteins isolated from Melipona beecheii honey.

Proteins from Melipona beecheii honey were purified by concanavalin A (conA) affinity chromatography and eluted with a stepwise glucose gradient into fractions named F2-F5. The conA-unbound fraction (F1) was further separated by molecular exclusion into fractions named MbF1-1,2 and MbF1-3. All fractions were evaluated for antibacterial activity against foodborne pathogens and antioxidant capacity. F1 fraction possessed highest antimicrobial activity against S. aureus, L. monocytogenes, S. Typhimurium, E. coli and P. aeruginosa with MIC's 1.4 ± 0.2, 15 ± 1, 39 ± 2, 1 ± 0.1, and 75 ± 2 µg/mL, respectively. F1, MbF1-1,2 and MbF1-3 had bactericidal effect except against P. aeruginosa. When the antioxidant capacity of the fractions was determined, F2 had the highest antioxidant activity measured by DPPH radical scavenging activity (IC50 = 2.4 ± 0.4 µg/µL) and reducing power of Fe(III) (IC50 = 1.8 ± 0.2 µg/µL). We provide evidence that M. beecheii honey proteins possess broad spectrum antibacterial and antioxidant activity, the latter probably through their reducing agent and free radical scavenger properties.

Effect of plant growth-promoting bacteria on the growth and fructan production of Agave americana L

ABSTRACT The effect of plant growth-promoting bacteria inoculation on plant growth and the sugar content in Agave americana was assessed. The bacterial strains ACO-34A, ACO-40, and ACO-140, isolated from the A. americana rhizosphere, were selected for this study to evaluate their phenotypic and genotypic characteristics. The three bacterial strains were evaluated via plant inoculation assays, and Azospirillum brasilense Cd served as a control strain. Phylogenetic analysis based on the 16S rRNA gene showed that strains ACO-34A, ACO-40 and ACO-140 were Rhizobium daejeonense, Acinetobacter calcoaceticus and Pseudomonas mosselii, respectively. All of the strains were able to synthesize indole-3-acetic acid (IAA), solubilize phosphate, and had nitrogenase activity. Inoculation using the plant growth-promoting bacteria strains had a significant effect (p < 0.05) on plant growth and the sugar content of A. americana, showing that these native plant growth-promoting bacteria are a practical, simple, and efficient alternative to promote the growth of agave plants with proper biological characteristics for agroindustrial and biotechnological use and to increase the sugar content in this agave species.

Effect of plant growth-promoting bacteria on the growth and fructan production of Agave americana L.

The effect of plant growth-promoting bacteria inoculation on plant growth and the sugar content in Agave americana was assessed. The bacterial strains ACO-34A, ACO-40, and ACO-140, isolated from the A. americana rhizosphere, were selected for this study to evaluate their phenotypic and genotypic characteristics. The three bacterial strains were evaluated via plant inoculation assays, and Azospirillum brasilense Cd served as a control strain. Phylogenetic analysis based on the 16S rRNA gene showed that strains ACO-34A, ACO-40 and ACO-140 were Rhizobium daejeonense, Acinetobacter calcoaceticus and Pseudomonas mosselii, respectively. All of the strains were able to synthesize indole-3-acetic acid (IAA), solubilize phosphate, and had nitrogenase activity. Inoculation using the plant growth-promoting bacteria strains had a significant effect (p<0.05) on plant growth and the sugar content of A. americana, showing that these native plant growth-promoting bacteria are a practical, simple, and efficient alternative to promote the growth of agave plants with proper biological characteristics for agroindustrial and biotechnological use and to increase the sugar content in this agave species.

Oxidative stress response of Mycosphaerella fijiensis, the causal agent of black leaf streak disease in banana plants, to hydrogen peroxide and paraquat.

Mycosphaerella fijiensis causes black leaf streak disease in banana and plantain. This fungus is usually attacked by reactive oxygen species secreted by the plant or during exposure to fungicide, however, little is known about the antioxidant response of the fungus. In this study, mycelia were observed to totally decompose 30 mmol/L of hydrogen peroxide (H2O2) within 120 min, liberating oxygen bubbles, and also to survive in concentrations as high as 100 mmol/L H2O2. The oxidative stress responses to H2O2, paraquat, and hydroquinone were characterized in terms of the activities of catalase and superoxide dismutase (SOD). Two active catalase bands were seen in native PAGE induced by H2O2. Band I had monofunctional activity and band II had bifunctional catalase-peroxidase activity. Two isozymes of SOD, distinguishable by their cyanide sensitivity, were found; CuZnSOD was the main one. The combination of H2O2 and 3-aminotriazole reduced the accumulation of biomass up to 40% compared with exposure to H2O2 alone, suggesting that catalase is important for the rapid decomposition of H2O2 and has a direct bearing on cell viability. The results also suggest that the superoxide anion formed through the redox of paraquat and hydroquinone has a greater effect than H2O2 on the cellular viability of M. fijiensis.

Identification of Actinobacillus pleuropneumoniae biovars 1 and 2 in pigs using a PCR assay.

Actinobacillus pleuropneumoniae causes swine pleuropneumonia worldwide. Previously, we described a gene sequence of approximately 800bp in A. pleuropneumoniae serotype 1 that encodes a metalloprotease of 24kDa, (Genbank accession no. AY217757). We selected primers carrying the forward and reverse 5'-terminal sequences of this region of the gene for the development of a species-specific PCR assay. The primers amplified an 800bp sequence from isolated DNA and lysed bacteria of the 13 A. pleuropneumoniae biovar 1 serotypes, with the exception of subtype 1b. The primers also amplified the sequence in nasal secretion cultures from pigs with chronic and acute experimental pleuropneumonia. No PCR products were detected when A. pleuropneumoniae serotypes of biovar 2 were used. Internal primers from this gene sequence detected biovar 2 and subtype 1b, leading to the production of a 350bp PCR product. The primers did not amplify DNA from other related species from the Pasteurellaceae family. The 800bp PCR assay was sensitive in vitro, with a detection limit of 5.5pg of extracted DNA, and an average of 120CFU. The specificity and sensitivity of this PCR assay make it a useful method for the rapid identification and diagnosis of A. pleuropneumoniae.

Aqueous crude extract of Rhoeo discolor, a Mexican medicinal plant, decreases the formation of liver preneoplastic foci in rats.

There are many plants in Mexico with medicinal properties, some of them used in alternative medicine to treat cancer, such is the case of Rhoeo discolor L. Hér Hance (Commelinaceae family); however, there are not scientific reports that validate their antitumoral property. The present study shows the protective effects of the Rhoeo discolor aqueous crude extract (ACE) against rat liver cancer using the resistant-hepatocyte model. The carcinogenesis protocol consisted on the initiation with N-diethylnitrosamine, followed by the promotion with 2-acetylaminofluorene and a partial hepatectomy. After 24 days, the gamma-glutamyl transpeptidase positive, corresponding to altered hepatocytes foci (AHF), were quantified. Additionally to discard a possible carcinogenic effect of ACE, it was first tested as promoting agent instead 2-acetylaminofluorene, and second, ACE was administered as initiator and promoter instead of the whole carcinogenic treatment. In summary, firstly, ACE administration reduced the number and area of preneoplastic lesions with dose below 20mg/kg body weight and secondly, ACE administration neither presented a promoting or initiator effects nor induced the development of AHF. Results of this investigation justify continuing with further studies of Rhoeo discolor components to develop chemoprevention strategies as an option in the treatment of cancer.