Search

Copyright of Sustainability in Debate / Sustentabilidade em Debate is the property of University of Brasilia, Center for Sustainable Development 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 Ingeniería Agrícola y Biosistemas is the property of Universidad Autonoma Chapingo 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 generation of solid urban waste in Havana city with more than two million habitants reaches 20,000 m3 per day and demands efficient alternatives for its management and treatment. A considerable fraction corresponds to agricultural products residues, derived from the operation of more than 300 existing public markets, which due to their chemical nature can become a source to obtain organic matter carriers for agriculture. The biotransformation of these wastes was evaluated as an alternative treatment to avoid unfavorable environmental impacts associated to their accumulation and decomposition; the urban solid waste from the markets was composted (of fruits, vegetables, roots and tubers). The biotransformed material was evaluated for pH, electrical conductivity and the contents of organic matter, phosphorus, potassium, calcium, magnesium, copper, zinc, cadmium and lead; the germination index, basal respiration and the presence of pathogenic microorganisms (total and fecal coliforms and Salmonella sp.) were also determined. The obtained compost serves to prepare substrates for agricultural use, in mixtures with acid reaction soils. Its use does not imply contaminations by pathogenic microorganisms nor by heavy metals, according to valid international norms, which validates the selected treatment route for these residues. [ABSTRACT FROM AUTHOR]

Citrus fruits are one of the most interesting crops in the world, reaching an annual production of 102 million tons. During processing, the citrus industry generates 50% of byproducts that are important sources of biochemical phytochemicals such as carotenoids and polyphenolic compounds. The purpose of this study was the use of tangerine residues marketed in the Huasteca Potosina for the extraction and encapsulation of antioxidant polyphenols. Ultrasound equipment was used for extraction, evaluating 20, 40 and 60 min extraction with 70% ethanol. Polyphenols were quantified using the Folin Ciocalteu method and antioxidant activity by DPPH and ABTS methods. Sodium alginate 1.5% and calcium chloride 8% were used for encapsulation of compounds. The results showed that at 40 min of extraction a greater extraction of polyphenols was achieved (227 mg eq. ác. gálico/g of material). Regarding antioxidant activity, 93% and 88% of activity were observed by DPPH and ABTS respectively. Capsules of good size and consistency were obtained. The results show that tangerine residues contain phytochemicals with high antioxidant activity. [ABSTRACT FROM AUTHOR]

The energy reform in 2013 contributed to changes on the oil sector, boosting the national economy by reactivating wells. This, in turn, resulted in the generation of waste considered hazardous formaldehyde (CH2O), which is stored in tanks for final disposal, however, for cleaning the storage containers, a mixture of H2O-CH2O is generated. Therefore, this document presents the evaluation of the toxicity of H2O-CH2O from the washing of tanks located in the Pajaritos refinery. Although there are different methods of toxicological evaluation to determine the lethal dose (DL50), the ex-situ evaluation is proposed, to treat it and later take it to final disposal. The evaluation consisted of measuring and inhibiting the growth of Escherichia coli at various concentrations (7.81-1000 mg/mL), semi-quantitatively on Mueller-Hinton agar by the plate dilution method for 48 hours (h) and monitoring every 24 hours. h. Regarding the lethality test in Artemia salina, it was evaluated for 24 h. DL50 was observed to completely inhibit the microbial growth of Escherichia Coli was at 1000 mg/mL from 24 h. On the other hand, Artemia salina presented hostile effects from concentration 7.7 mg/mL to 1000mg/mL. In conclusion, the proposed concentrations of RP from CH2O have a high toxicity for Escherichia coli and Artemia salina, causing lethality in both. Keywords: Artemia saline, DL50, Escherichia coli, formaldehyde, residues, toxicity. [ABSTRACT FROM AUTHOR]

Copyright of MESO is the property of Zadruzna Stampa D.D. 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 MESO is the property of Zadruzna Stampa D.D. 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 MESO is the property of Zadruzna Stampa D.D. 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 Galician Journal of Economics / Revista Galega de Economía is the property of Universidad de Santiago de Compostela, Servicio de Publicaciones 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.)