Search

Copyright of Neutrosophic Computing & Machine Learning is the property of Multimedia Larga and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The biofixation capacity of carbon dioxide by the Chlorella vulgaris and Scenedesmus obliquus species cultivated in photobioreactors was evaluated in a 12:12 h photoperiod. A completely randomized experimental design was used, whose sources of variation were: microalgal species and CO2 dosage (0.36, 11.44 and 22.62 g.d-1). The photobioreactors were plastic units with 3.8 L of culture medium (NPK solution + micronutrients), and artificial lighting with a 4400 lumens fluorescent lamp. The following variables were estimated: biomass productivity using the dry weight methodology, CO2 biofixation by numerical method and CO2 removal efficiency in percentage. The results were subjected to the analysis of variance and Tukey's mean tests (p <0.05). Higher biomass productivity and CO2 biofixation were recorded in C. vulgaris compared to S. obliquus. The highest biofixation of CO2 by C. vulgaris and S. obliquus was recorded at the dose of 11.44 gd-1 with 161.79 ± 4.72 and 55.31 ± 0.73 mg.L-1d-1, respectively. The CO2 removal efficiency was significantly higher with the 0.36 g.d-1 dose, registering values of 49.80 ± 3.16 and 39.13 ± 0.57 % for C. vulgaris and S. obliquus respectively. These results suggest the possibility of scaling up low-cost photobioreactors for biofixation of CO2 emissions in industrial fixed fonts, thus contributing to the mitigation of greenhouse gases. [ABSTRACT FROM AUTHOR]

Copyright of Pacha: Revista de Estudios Contemporáneos del Sur Global is the property of PACHA REVISTA DE ESTUDIOS CONTEMPORANEOS DEL SUR GLOBAL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Nitrogen (N) and Sulfur (S) are nutrients that have a strong uptake interaction. Therefore, the addition of these nutrients in the right ratio has a positive influence in plant development. This work is aiming to assess the effects of the interaction between NH4+ and SO42- at different concentrations, on the growth, physiology, and macronutrient concentration in Lisianthus (Eustoma grandiflorum (Raf.) Shinn.) cv. Dark Pink ABC 1-2. The trial treatments included three concentrations of NH4+ (0, 2.5 and 5 meq L-1) and two concentrations of SO42- (7 y 10 meq L-1). The different concentrations of SO42- y NH4+ were based on Steiner’s nutrient solution modifications. We used 10-liter black polyethylene containers and perlite substrate with particles size of 0.2-0.5mm in diameter. The results showed that the stem diameter and dry biomass production of roots, stems, flowers, and total biomass were higher with 5 meq L-1 of NH4+ and 7 meq L-1 of SO42-. On the other hand, total leaf dry weight and plant height were higher with 2.5 meq L-1 of NH4+ and 7 meq L-1 of SO42-. The plants showed the same behavior in terms of photosynthesis, transpiration, and stomatal conductance. We obtained the highest concentration of N and P by applying 2.5 meq L-1 of NH4+ with 10 meq L-1 of SO42. Furthermore, Mg, and S concentrations were higher when we supplied 2.5 meq L-1 of NH4+ with the two concentrations of SO42; while K and Ca were higher when we increased the concentration of NH4+ with 7 meq L-1 of SO42-. We obtained the best growth rate, biomass production and nutrient concentration (K and Ca) in Lisianthus plants with 5 meq L-1 of NH4+/ 7 meq L-1 of SO42-; while physiological activity improved with 2.5 meq L-1 of NH4+ / 7 meq L-1 of SO42- ratio. [ABSTRACT FROM AUTHOR]

Objectives: To determine the prevalence of chronic urticaria in patients diagnosed with an allergic pathology; to know the most affected sex and age group. Methods: A descriptive, observational, and retrospective cross-sectional study. Clinical records of patients diagnosed with chronic urticaria in Unidad de Medicina Integral (Integrated Care Unit) of Tehuacan, Puebla were reviewed. They were selected by age, sex, and diagnosed allergic pathology. Results: In the period of January 1st, 2015, to December 31st, 2020, 373 patients were diagnosed with chronic urticaria, with a prevalence of 10.5%. The average age of the population was 26.05 years. Women were the most prevalent, with 59.5% of the total studied population. Conclusions: The results reflect a prevalence of 10.5%, with a higher frequency in women at a ratio of 1.4: 1 with regard to males. The prevalence of chronic urticaria has increased significantly in recent years and especially in young patients (infants, preschoolers, and school-age children). [ABSTRACT FROM AUTHOR]

Copyright of Dilemas Contemporáneos: Educación, Política y Valores is the property of Dilemas Contemporaneos: Educacion, Politica y Valores and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Ciencia Administrativa is the property of Universidad Veracruzana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The objective of this work was to determine the average annual increment (IMA) of KhayanyasicaStapf Ex Baker F in plantations, being one of the species with the greatest contribution in the economy of the agroforestry company Ciénaga de Zapata for the volume of wood that contributes to the secondary processing industry of wood. To develop the work we used the data from 37 plots of which 3 were permanent sampling (PPM), which have made possible to determine the increments in diameter and height where the species has developed satisfactorily in soilsfrom carbonate pardos to red ferralitic The obtained results show that the Khayanyasica have good development in the site conditions of the study area, which guarantees to continue promoting the species due to its growth in diameter and height for its use in the industry. [ABSTRACT FROM AUTHOR]

This paper reviews a recent strand of research emphasizing how the present institutions of the knowledge economy may be jeopardizing the very promise of growth and prosperity that the increased use of knowledge is generally reported to bring about. The excessive privatization of knowledge generates self-reinforcing vicious and virtuous circles of accumulation of intellectual property and investment in human capital, which increase global inequality. The present institutions of the global economy entail also a reduction of global investment opportunities that is one of the causes of the present global depression. Absent spontaneous antidotes to these phenomena, economic and science policies should aim at redressing the balance between public and private knowledge. Because of the distortion of incentives, stemming from uncompensated knowledge externalities at the international level, these policies should necessarily be coordinated at global level. [ABSTRACT FROM AUTHOR]

Copyright of Observatorio Medioambiental is the property of Universidad Complutense de Madrid and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The availability of microorganism strains with growth promoting effect on economically important species is one of the main aspects for elaborating bio-products, contributing to the sustainability of the production systems. The aim of this research was to select effective strains of Mesorhizobium sp to increase the yield of chickpea (Cicer arietinum. L), due to the variability shown by the INIFAT GR-1 strain over the last years, which is recommended in the technical instructions for this cultivar. Positive strains were purified and performed to conduct a morphological, physiological and biochemical characterization of the isolates, allowing the inclusion of two of them in the Mesorhizobium genre. The strain metabolic characterization showed its superiority with respect to INIFAT GR-1, as indicated by the increase in the phosphorus solubilization halo of 0,18 cm, and an increase of indol acetic acid (IAA) production ranging between 7-12 μgmL-1. Its compatibility in vitro with Azotobacter chroococcum, Bacillus megatherium var phosphaticum, and Bacillus subtilis, as well as, with pesticides as Poncho, Celest Top, Gaucho FS-60, Gaucho MT, Yunta, Celest, TMTD, Cropstar and Apron Star was tested. Regarding the effects under field conditions, both strains promotes chickpea growth, development and yield (pods and grains), with values statistically superior to the pattern employed. They were growth in shaker conditions at 200 r.p.m. and 32 0C of temperature with a final concentration of 1011 UFC.mL-1. The uses of the better strains produce the increase of Nacional-29 variety yield in 42 %, in comparison with no treated plants. [ABSTRACT FROM AUTHOR]

The research was conducted in the seasonally dry forest Algodonal, Macará canton, province of Loja. A permanent plot of one hectare established in 2006, to understand the dynamics of growth of woody species bought itself. D1,30m, data were recorded overall height, including the new income individuals or ≥ 5 cm D1,30 m. With data from 2006 and 2014, the dynamism of the forest was determined; growth and annual periodic increment of diameter, height and volume were determined. Year 2014, 1113 individuals were found/ha belonging to 24 species of 23 genera in 14 families. A mortality of 130 individuals/ha and recruitment of 137 individuals/ ha was determined; obtaining a buoyant 1,5 % a year. The forest in 2006 had a total volume of 60,20 m3 /ha; and, in 2014, 62,49 m3 /ha. In regard to growth average diameter of 1,63 cm/ha, height 2,33 m/ha, basal area of 0,0065 m2 /ha and a volume growth of 0,0683 m3 /ha. The forest reached a regular annual increase in diameter of 0,2545 cm/ha/year, up 0,2916 m/ha year, the basal area 0,0008 m2 /ha/ yr and volume of 0,0085 m3 /ha/year a period of eight years. The species of greatest growth in the period of eight years are: in D13,0 m Zanthoxylum sp. and Ceiba trichistandra, in height: Salacia sp. and Colicodendron scabridum, in basal area: Cochlospermun vitifolium and Ceiba trichistandra; in volume: Ceiba trichistandra and Erythrina velutina. [ABSTRACT FROM AUTHOR]

Copyright of Observatorio Medioambiental is the property of Universidad Complutense de Madrid and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The tomato cultivation is the great economical importance on the world. In the present work the use of the mycorrhizal fungi and the nitrogenated fertilization in the growth, nutrition and yield of tomato (Solanum lycopersicum, Lin.) variety Vyta were carried out. The experiment in field with a randomly blocks design with 8 treatments and 4 replicate at Cautillo's locality in Jiguaní municipality belonging Granma province were executed. In this experiment was combined Glomus fasciculatum with the 60 % and 75 % of nitrogen indicated for this cultivation aside from the use phosphorus and potassium a fixed bottom. The results evidenced the effectiveness of G. fasciculatum over yields. The system optimization with the reduction of 40 % of the nitrogen and a yield increase over of the doses taken as reference. [ABSTRACT FROM AUTHOR]