Encapsulation of Azotobacter vinelandii ATCC 12837 in Alginate-Na Beads as a Tomato Seedling Inoculant.

Encapsulation is an immobilization method characterized by restricting microbial cells to a delimited area while preserving their metabolic viability. This technique represents an alternative to improve the adaptive capacity of bacteria in the face of interactions with native microorganisms and environmental factors that limit their inoculation. This study aimed to evaluate the effect of Azotobacter vinelandii ATCC 12837 encapsulated in alginate-Na beads as an inoculant of tomato (Solanum Lycopersicum L) seedlings. Two inoculation treatments were carried out: liquid and encapsulated, and the control without microorganisms. Physiological variables, microbial viability, and the presence of A. vinelandii were determined by qPCR. Inoculation with A. vinelandii in liquid and encapsulated form favored seedling growth. Plants with the encapsulated inoculum significantly increased germination percentage (20%), stem diameter (38%), seedling height (34%), root length (69%), NO3 concentration (41%), and Na (30%); compared to the control. Encapsulation of A. vinelandii in alginate-Na macrocapsules allowed its establishment in the rhizosphere and was corroborated by viable count and molecular methods. The viability of the bacteria was maintained for 28 days using both inoculation methods, and not detected in the control treatment.

Traditional Fermented Foods and Beverages from around the World and Their Health Benefits.

Traditional fermented foods and beverages play an important role in a range of human diets, and several experimental studies have shown their potential positive effects on human health. Studies from different continents have revealed strong associations between the microorganisms present in certain fermented foods (e.g., agave fructans, kefir, yeats, kombucha, chungkookjang, cheeses and vegetables, among others) and weight maintenance, reductions in the risk of cardiovascular disease, antidiabetic and constipation benefits, improvement of glucose and lipids levels, stimulation of the immunological system, anticarcinogenic effects and, most importantly, reduced mortality. Accordingly, the aim of this review is to corroborate information reported in experimental studies that comprised interventions involving the consumption of traditional fermented foods or beverages and their association with human health. This work focuses on studies that used fermented food from 2014 to the present. In conclusion, traditional fermented foods or beverages could be important in the promotion of human health. Further studies are needed to understand the mechanisms involved in inflammatory, immune, chronic and gastrointestinal diseases and the roles of fermented traditional foods and beverages in terms of preventing or managing those diseases.

Effect of the Intake of a Traditional Mexican Beverage Fermented with Lactic Acid Bacteria on Academic Stress in Medical Students.

Dysbiosis of the gut microbiota has been associated with different illnesses and emotional disorders such as stress. Traditional fermented foods that are rich in probiotics suggest modulation of dysbiosis, which protects against stress-induced disorders. The academic stress was evaluated in medical students using the SISCO Inventory of Academic Stress before and after ingestion of an aguamiel-based beverage fermented with Lactobacillus plantarum, Lactobacillus paracasei and Lactobacillus brevis (n = 27) and a control group (n = 18). In addition, microbial phyla in feces were quantified by qPCR. The results showed that the consumption of 100 mL of a beverage fermented with lactic acid bacteria (3 × 108 cfu/mL) for 8 weeks significantly reduced academic stress (p = 0.001), while the control group (placebo intervention) had no significant changes in the perception of academic stress (p = 0.607). Significant change (p = 0.001) was shown in the scores for environmental demands, and physical and psychological factors. Consumption of the fermented beverage significantly increased the phyla Firmicutes and Bacteroidetes but not Gammaproteobacteria. No significant changes were found in the control group, except for a slight increase in the phylum Firmicutes. The intake of this fermented beverage suggest a modulation of gut microbiota and possible reduction in stress-related symptoms in university students, without changing their lifestyle or diet.

Growth, respiratory activity and chlorpyrifos biodegradation in cultures of Azotobacter vinelandii ATCC 12837.

This study aimed to evaluate the growth, respiratory activity, and biodegradation of chlorpyrifos in cultures of Azotobacter vinelandii ATCC 12837. A strategy based on the modification of culture media and aeration conditions was carried out to increase the cell concentration of A. vinelandii, in order to favor and determine its tolerance to chlorpyrifos and its degradation ability. The culture in shaken flasks, using sucrose as a carbon source, significantly improved the growth compared to media with mannitol. When the strain was cultivated under oxygen-limited (5.5, 11.25 mmol L-1 h-1) and no-oxygen-limited conditions (22 mmol L-1 h-1), the growth parameters were not affected. In cultures in a liquid medium with chlorpyrifos, the bacteria tolerated a high pesticide concentration (500 ppm) and the growth parameters were improved even under conditions with a reduced carbon source (sucrose 2 g L-1). The strain degraded 99.6% of chlorpyrifos at 60 h of cultivation, in co-metabolism with sucrose; notably, A. vinelandii ATCC 12837 reduced by 50% the initial pesticide concentration in only 6 h (DT50).

Anaerobic biodegradability and inhibitory effects of some anionic and cationic surfactants.

The anaerobic biodegradability and inhibitory effects on the methane production of three different surfactants, two anionic: sodium lauryl sulfate (SLS) and sodium dodecylbenzene sulfonate (SDBS), and a cationic surfactant: trialkyl-methylammonium chloride (TMAC), were evaluated with two different anaerobic sludges, granular and flocculent. Five different concentrations of the surfactants, 5, 50, 100, 250 and 500 mg/L, were tested. SLS was biodegraded at concentrations of 5, 50 and 100 mg/L with flocculent sludge and at 100 and 250 mg/L with granular sludge. However an inhibitory effect on methane production was observed in both sludges at 500 mg/L. The results indicate that SDBS was not biodegradable under anoxic conditions. TMAC was slightly degraded 50 and 100 mg/L with the flocculent sludge, and from 100 to 500 mg/L with the granular sludge.

Use of waste canola oil as a low-cost substrate for rhamnolipid production using Pseudomonas aeruginosa.

Rhamnolipids are glycolipid biosurfactants that are primarily produced by Pseudomonas aeruginosa that have gained a great deal of interest for their numerous industrial applications and environmentally friendly properties. In this study, we explored the potential of waste canola oil as a low-cost and environmentally friendly substrate for the production of rhamnolipids by P. aeruginosa. Four different 23 full factorial designs were used to assess the effect of three independent factors on rhamnolipid production, including carbon source (canola oil and waste canola oil), nitrogen source [(NH4)2SO4 and NaNO3] and production time (7 and 14 days). The highest observed yield was 3585.31 ± 66.24 mg/L when P. aeruginosa was cultured for 14 days with 3% v/v waste canola oil and 4 g/L of NaNO3. The nitrogen source proved to be a crucial factor, as the use of NaNO3 rather than (NH4)2SO4 led to a 30-fold increase in production yield. The observed yield when waste canola oil was used was similar to, and even slightly higher than, that obtained using canola oil. Our results showed that waste canola oil has great potential for use as a carbon source for rhamnolipid production by P. aeruginosa, thus paving the way for the development of a low-cost, efficient, and environmentally friendly bioprocess for the production of rhamnolipids.

[Evaluation of genetic damage and eating habits in children with normal weight and obesity in school age]. / Evaluación del daño genético y de los hábitos alimentarios en niños con normopeso y obesidad en edad escolar.

INTRODUCTION: Introduction: obesity is a worldwide problem that predisposes to other health conditions. A direct relationship has been shown between obesity and genetic damage; the late is considered as an early marker of cancer in some cases. Objective: to evaluate the genetic damage and eating habits of children with obesity and normal weight. Methods: cross-sectional study conducted in school-age children. Genetic damage was assessed from buccal epithelial mucosal cells, through the quantification of nuclear abnormalities such as micronuclei, karyorrhexis, caryolysis, pyknosis and the presence of two nuclei. The nutritional evaluation was carried out through the analysis of weight, height and the evaluation of their diet through nutritional clinical records. Results: no significant differences were found in the number of nuclear abnormalities between the groups studied. However, some children with obesity showed higher number of nuclear abnormalities compared with children with normal weight. Regarding their eating habits, a positive correlation was found between weight and the consumption of free sugars and proteins in the diet. Conclusions: the lack of evidence that correlates micronuclei with nutritional status suggests that the presence of these abnormalities can be attributed to environmental or epigenetic factors. Special attention requires the study of diets similar to those habitually consumed by this population, in order to avoid their potential consequences. This study represents an important contribution in the evaluation of the possible health risks associated with childhood obesity.

INTRODUCCIÓN: Introducción: la obesidad es un problema mundial que predispone a otras complicaciones de salud. Se ha demostrado que existe una relación directa entre obesidad y daño genético, lo que se considera en algunos casos como un marcador temprano de cáncer. Objetivo: evaluar el daño genético y los hábitos alimentarios de niños con obesidad y con normopeso. Métodos: estudio transversal realizado en niños en edad escolar. Partiendo de células de la mucosa del epitelio bucal, se evaluó el daño genético a través de la cuantificación de anormalidades nucleares tales como micronúcleos, cariorrexis, cariolisis, picnosis y presencia de dos núcleos. La evaluación nutricional se realizó mediante el análisis de peso, talla y la valoración de su alimentación por medio de historias clínicas nutricionales. Resultados: no se encontraron diferencias significativas en el número de anormalidades nucleares entre los grupos, aunque algunos niños con obesidad mostraron mayor número de anormalidades nucleares en comparación con niños con normopeso. En cuanto a sus hábitos alimentarios, se encontró una correlación positiva entre peso y el consumo de azúcares libres y proteínas en la dieta. Conclusiones: la falta de evidencia que correlacione los micronúcleos con el estado nutricional sugiere que la presencia de estas anormalidades se puede atribuir a factores ambientales o epigenéticos. Especial atención requiere el estudio de dietas similares a las consumidas habitualmente por esta población, con la finalidad de evitar sus potenciales consecuencias. Este estudio representa una contribución importante en la evaluación de los posibles riesgos para la salud asociados con la obesidad infantil.

Conocimiento etnobotánico sobre el uso de plantas medicinales en la Sierra Negra de Puebla, México / Ethnobotanical knowledge on the use of medicinal plants in the Sierra Negra de Puebla, Mexico

Medicinal plants are very useful for man and is the result of the experience that has accumulated for generations. The aim of the study was to obtain information on the use of medicinal plants used in indigenous communities of the Sierra Negra de Puebla, Mexico. A semi-structured interview was applied to 635 people; 79.5% women and 20.5% men. The use of 43 species divided into 21 families was reported. The most used families were Asteraceae (8 spp.), Lamiaceae (4 spp.) And Rutaceae (4 spp.), The species with higher frequency and use value were Matricaria recutita and Mentha piperita, the main affections treated were; stomach pain, cough and flu. The leaves were the most used (55%) the main form of preparation (30.2%) was maceration, most (65%) grow the plants in orchards. In indigenous communities, women have a preponderant role in the use of medicinal plants.

Las plantas medicinales son de gran utilidad para el hombre y es resultado de la experiencia que ha acumulado por generaciones. El objetivo del estudio fue obtener información sobre el uso de las plantas medicinales utilizadas en comunidades indígenas de la Sierra Negra de Puebla, México. Se aplicó una entrevista semiestructurada a 635 personas; 79.5% mujeres y 20.5% hombres. Se reportó el uso de 43 especies divididas en 21 familias. Las familias más utilizadas fueron Asteraceae (8 spp.), Lamiaceae (4 spp.) y Rutaceae (4 spp.), las especies con mayor frecuencia y valor de uso fueron Matricaria recutita y Mentha piperita, las principales afecciones tratadas fueron; dolor estomacal, tos y gripa. Las hojas fueron la parte más utilizada (55%) la principal forma de preparación (30.2%) fue maceración, la mayoría (65%) cultiva las plantas en huertos. En comunidades indígenas la mujer tiene un papel preponderante en el uso de las plantas medicinales.