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151.
Silvia H. G. Brondi Adriana N. De Macedo Gilberto B. de Souza Ana R. A. Nogueira 《Journal of environmental science and health. Part. B》2013,48(8):671-677
Analytical methods for the isolation and determination of cypermethrin in milk, based on the solid-phase microextraction (SPME) and QuEChERS methods (Quick, Easy, Cheap, Effective, Rugged, and Safe) are presented. The SPME technique was not appropriate to analyse cypermethrin in milk, even establishing the best extraction conditions, polydimethylsiloxane fiber, 60 min time extraction, 60 °C temperature extraction, addition of salt (NaCl) and stirring rate. The extraction efficiency was low probably because of the matrix constituents. The QuEChERS method involves the extraction of the analyte with acetonitrile and simultaneous liquid-liquid partitioning formed by adding anhydrous MgSO4 plus NaCl, followed by the removal of residual water and cleanup using a procedure called dispersive solid-phase extraction, in which anhydrous MgSO4 plus PSA and C18 are mixed with 1 mL of acetonitrile extract. The detection and quantification limits were 0.01 and 0.04 mg kg?1, respectively, and the percentage recovery obtained ranged from 92 to 105% with relative standard deviations below 7%. 相似文献
152.
Moral-Rodríguez Adriana I. Leyva-Ramos Roberto Mendoza-Mendoza Esmeralda Díaz-Flores Paola E. Carrales-Alvarado Damarys H. Alexandre-Franco María F. Fernández-González Carmen 《Environmental science and pollution research international》2023,30(10):25193-25204
Environmental Science and Pollution Research - The importance of the textural and physicochemical characteristics upon the adsorption capacity of the commercial activated carbons (ACs) Coconut,... 相似文献
153.
Osińska Adriana Korzeniewska Ewa Korzeniowska-Kowal Agnieszka Wzorek Anna Harnisz Monika Jachimowicz Piotr Buta-Hubeny Martyna Zieliński Wiktor 《Environmental science and pollution research international》2023,30(5):11572-11583
Environmental Science and Pollution Research - Escherichia coli bacteria are an essential indicator in evaluations of environmental pollution, which is why they must be correctly identified. This... 相似文献
154.
Environmental Economics and Policy Studies - This paper ranks two widely used command-and-control environmental instruments, in terms of relevant equilibrium variables such as output, profits,... 相似文献
155.
Kolesarova A Capcarova M Arpasova H Kalafova A Massanyi P Lukac N Kovacik J Schneidgenova M 《Journal of environmental science and health. Part. B》2008,43(7):625-632
The purpose of this study was to determine certain blood biochemical parameters in hens of Isa Brown breed (n = 20) after nickel administration. Animals were divided into four groups (K, P1, P2, P3). Experimental hens (n = 5; in each group) received nickel (NiCl2) as peroral administration in drinking water in various doses (P1 - 0.02 g NiCl2/L; P2 - 0.2 g NiCl2/L; P3 - 2.0 g NiCl2/L of drinking water) for 28 days. The last group - K (n = 5) was the control, receiving no nickel. Biochemical parameters of mineral profile (calcium; phosphorus; magnesium; sodium; potassium) and of energy and enzymatic profile [(glucose; total cholesterol; total proteins; triglycerides; alanine aminotransferase (ALT) aspartate aminotransferase (AST) gamma glutamyl transferase (GGT) and glutamatdehydrogenase (GLDH)] were analyzed in blood serum on Day 0, 7, 14, 21 and 28 of the experiment. Average levels of mineral metabolism parameters were relatively stable apart from calcium. The evaluation registered a significant decrease in calcium during the experiment mainly in the group with highest nickel concentration in drinking water. No significant differences were detected between groups in energy and enzymatic profile apart from the concentrations of ALT on Day 7. In conclusion, there were significant associations between nickel levels and calcium and ALT in blood serum of the hens. No significant differences were detected in other biochemical parameters of mineral profile (P, Mg, Na, K) and energy and enzymatic profile (glucose, total cholesterol, total proteins, triglycerides, AST, GGT and GLDH) after nickel administration. Our results may contribute to an evaluation of reference levels of analyzed parameters, to monitor the health and nutritional status of hens. In this study also the negative effect of nickel mainly on calcium metabolism was detected. 相似文献
156.
Budeanu Adriana 《Journal of Cleaner Production》2009,17(16):1385-1392
Extensive tourism developments and signals of the negative effects on destinations have put sustainability at the core of the business agenda. However, the fragmented structure of the tourism sector remains a key challenge for achieving consensus and developing coherent sustainable tourism strategies. Although supply chain strategies seem logically suitable for the interconnected nature of the tourism industry, there is limited discussion in tourism research about their adoption. In order to advance the knowledge of how sustainable tourism can become more of common practice, this article explores the adoption of environmental supply chain management (ESCM) by eight large tour operators. The results of the investigations show that in the absence of regulatory pressures and cost saving benefits, the adoption of ESCM is triggered by public pressures and its implementation is limited by organizational factors and strategic myopia. 相似文献
157.
Alessandro José Queiroz Sarnaglia Nátaly Adriana Jiménez Monroy Arthur Gomes da Vitória 《Environmental and Ecological Statistics》2018,25(4):443-469
This paper considers the modeling and forecasting of daily maximum hourly ozone concentrations in Laranjeiras, Serra, Brazil, through dynamic regression models. In order to take into account the natural skewness and heavy-tailness of the data, a linear regression model with autoregressive errors and innovations following a member of the family of scale mixture of skew-normal distributions was considered. Pollutants and meteorological variables were considered as predictors, along with some deterministic factors, namely week-days and seasons. The Oceanic Niño Index was also considered as a predictor. The estimated model was able to explain satisfactorily well the correlation structure of the ozone time series. An out-of-sample forecast study was also performed. The skew-normal and skew-t models displayed quite competitive point forecasts compared to the similar model with gaussian innovations. On the other hand, in terms of forecast intervals, the skewed models presented much better performance with more accurate prediction intervals. These findings were empirically corroborated by a forecast Monte Carlo experiment. 相似文献
158.
Understanding why a species is present in a particular location and the consequences of its presence is complex but necessary
to identify the mechanisms that generate and maintain ecological diversity. The common sea star Echinaster sepositus can be either very abundant or non-existing in nearby localities of the western Mediterranean. Yet, the factors that shape
its distribution and the impact of the sea star on natural communities remain uninvestigated. Here, we quantified multiple
biotic and abiotic factors that may affect the distribution of E. sepositus and tested whether this sea star can shape the organization of the community it inhabits. Our results showed that the distribution
of this sea star was highly contagious and positively correlated with the abundance and distribution of crustose coralline
algae from tens of meters to tens of kilometers. Despite significant differences in community composition between localities
with high or low abundance of the sea star, experimental addition of E. sepositus to natural communities failed to shift the composition of the algal community in 4 months. Overall, our results suggest that
within habitat variability in the abundance of crustose coralline algae may explain the abundance of E. sepositus at multiple geographic scales, emphasizing the need to investigate small-scale processes at larger geographic scales. 相似文献
159.
160.
dos Santos Debora Regina Lopes Silva-Sales Marcelle Fumian Tulio Machado Maranhão Adriana Gonçalves Malta Fábio Correia Ferreira Fernando César Pimenta Marcia Maria Miagostovich Marize Pereira 《Food and environmental virology》2023,15(1):21-31
Food and Environmental Virology - This study assessed the sources of contamination of water matrices in a rural area using detection of a host-specific virus (human adenovirus [HAdV], porcine... 相似文献