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11.
Irma Dervišević Duško Minić Željko Kamberović Vladan Ćosović Mirjana Ristić 《Environmental science and pollution research international》2013,20(6):4278-4292
In this paper, we have analyzed parts of printed circuit board (PCB) and liquid crystal display (LCD) screens of mobile phones and computers, quantitative and qualitative chemical compositions of individual components, and complete PCBs were determined. Differential thermal analysis (DTA) and differential scanning calorimetry (DSC) methods were used to determine the temperatures of phase transformations, whereas qualitative and quantitative compositions of the samples were determined by X-ray fluorescence spectrometry (XRF), inductively coupled plasma optical emission spectrometry (ICP-OES), and scanning electron microscopy (SEM)-energy dispersive X-ray spectrometry (EDS) analyses. The microstructure of samples was studied by optical microscopy. Based on results of the analysis, a procedure for recycling PCBs is proposed. The emphasis was on the effects that can be achieved in the recycling process by extraction of some parts before the melting process. In addition, newly developed materials can be an adequate substitute for some of the dangerous and harmful materials, such as lead and arsenic are proposed, which is in accordance with the European Union (EU) Restriction of the use of certain hazardous substances (RoHS) directive as well as some alternative materials for use in the electronics industry instead of gold and gold alloys. 相似文献
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13.
Rosas Pérez I Serrano J Alfaro-Moreno E Baumgardner D García-Cuellar C Martín Del Campo JM Raga GB Castillejos M Colín RD Osornio Vargas AR 《Chemosphere》2007,67(6):1218-1228
Previous studies have used particle mass and size as metrics to link airborne particles with deleterious health effects. Recent evidence suggests that particle composition can play an important role in PM-toxicity; however, little is known about the specific participation of components (individually or acting in groups) present in such a complex mixture that accounts for toxicity. This work explores relationships among PM(10) components in order to identify their covariant structure and how they vary in three sites in Mexico City. Relationships between PM(10) with cell toxicity and geographical location were also explored. PM(10) was analyzed for elemental composition, organic and elemental carbon, endotoxins and the induction of inhibition of cell proliferation, IL-6, TNFalpha and p53. PM(10) variables were evaluated with principal component analysis and one-way ANOVA. The inhibition of cell proliferation, IL-6 and TNFalpha were evaluated with factorial ANOVA and p53 with the Welch test. The results indicate that there is heterogeneity in particle mass, composition and toxicity in samples collected at different sites. Multivariate analysis identified three major groups: (1) S/K/Ca/Ti/Mn/Fe/Zn/Pb; (2) Cl/Cr/Ni/Cu; and (3) endotoxins, organic and elemental carbon. Groups 1 and 3 showed significant differences among sites. Factorial ANOVA modeling indicated that cell proliferation was affected by PM concentration; TNFalpha and IL-6 by the interaction of concentration and site, and p53 was different by site. Radial plots suggest the existence of complex interactions between components, resulting in characteristic patterns of toxicity by site. We conclude that interactions of PM(10) components determine specific cellular outcomes. 相似文献
14.
Herrera-Moreno José Francisco Medina-Díaz Irma Martha Bernal-Hernández Yael Yvette Ramos Kenneth S. Alvarado-Cruz Isabel Quintanilla-Vega Betzabet González-Arias Cyndia Azucena Barrón-Vivanco Briscia Socorro Rojas-García Aurora Elizabeth 《Environmental science and pollution research international》2019,26(15):15124-15135
Environmental Science and Pollution Research - Gene-specific changes in DNA methylation by pesticides in occupationally exposed populations have not been studied extensively. Of particular concern... 相似文献
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16.
Brigitte H. W. Faas Dineke Westra Sonja A. de Munnik Maartje van Rij Carlo Marcelis Sara Joosten Ingrid Krapels Vivian Vernimmen Malou Heijligers Marjolein H. Willemsen Nicole de Leeuw Tuula Rinne Rolph Pfundt Sanne P. Smeekens Sander P. A. Stegmann Merryn Macville Esther Sikkel Audrey Coumans Lia Wijnberger Irma Derks Josefa van Lent-Albrechts Tom Hofste Raoul Timmermans Janneke van den End Servi J. C. Stevens Ilse Feenstra 《黑龙江环境通报》2023,43(4):527-543
Objective
We performed a 1-year evaluation of a novel strategy of simultaneously analyzing single nucleotide variants (SNVs), copy number variants (CNVs) and copy-number-neutral Absence-of-Heterozygosity from Whole Exome Sequencing (WES) data for prenatal diagnosis of fetuses with ultrasound (US) anomalies and a non-causative QF-PCR result.Methods
After invasive diagnostics, whole exome parent-offspring trio-sequencing with exome-wide CNV analysis was performed in pregnancies with fetal US anomalies and a non-causative QF-PCR result (WES-CNV). On request, additional SNV-analysis, restricted to (the) requested gene panel(s) only (with the option of whole exome SNV-analysis afterward) was performed simultaneously (WES-CNV/SNV) or as rapid SNV-re-analysis, following a normal CNV analysis.Results
In total, 415 prenatal samples were included. Following a non-causative QF-PCR result, WES-CNV analysis was initially requested for 74.3% of the chorionic villus (CV) samples and 45% of the amniotic fluid (AF) samples. In case WES-CNV analysis did not reveal a causative aberration, SNV-re-analysis was requested in 41.7% of the CV samples and 17.5% of the AF samples. All initial analyses could be finished within 2 weeks after sampling. For SNV-re-analysis during pregnancy, turn-around-times (TATs) varied between one and 8 days.Conclusion
We show a highly efficient all-in-one WES-based strategy, with short TATs, and the option of rapid SNV-re-analysis after a normal CNV result. 相似文献17.
18.
García-Espinoza Josué Daniel Robles Irma Durán-Moreno Alfonso Godínez Luis A. 《Environmental science and pollution research international》2022,29(28):42305-42318
Environmental Science and Pollution Research - In this work, a cylindrical flow-through electro-Fenton reactor containing graphite felt electrodes and an Fe(II) loaded resin was evaluated for the... 相似文献
19.
Sophie Quérouil Jeremy Kiszka Ana Rita Cordeiro Irma Cascão Luís Freitas Ana Dinis Filipe Alves Ricardo Serrão Santos Narcisa M. Bandarra 《Marine Biology》2013,160(6):1325-1337
Short-beaked common dolphins (Delphinus delphis) and Atlantic spotted dolphins (Stenella frontalis) are the two most abundant cetacean species in the oceanic waters of Madeira and the Azores. They are of similar size, occur in similar habitats and are regularly observed in mixed-species groups to forage together. Genetic analyses suggested that, within each species, dolphins ranging around both archipelagos belong to the same panmictic population. We tested the hypotheses that (1) within each species, individuals from the two archipelagos belong to a single ecological stock; (2) between species, common and spotted dolphins have distinct trophic niches; using fatty acid (FA) and stable isotope (SI) analyses. Fatty acids and stable isotopes were analysed from 86 blubber and 150 skin samples of free-ranging dolphins, respectively. Sex-related differences were not significant, except for common dolphin FA profiles. In S. frontalis, FA and SI differences between archipelagos suggested that individuals belonged to different ecological stocks, despite the existence of gene flow between the two archipelagos. In D. delphis, differences were more pronounced, but it was not possible to distinguish between stock structure and a seasonal effect, due to differential sampling periods in the Azores and Madeira. Inter-specific comparisons were restricted to the Azores where all samples were collected during summer. Differences in FA proportions, noticeably for FA of dietary origin, as well as in nitrogen SI profiles, confirmed that both species feed on distinct resources. This study emphasizes the need for an integrated approach including both genetic and biochemical analyses for stock assessment, especially in wide-ranging marine top predators. 相似文献
20.
Alejandro Trejo 《Natural resources forum》1990,14(1):76-77
FIDEICOMISO of non-metallic minerals is a trust development fund aimed at providing credit and technical assistance for the exploitation, beneficiation and downstream processing of non-metallics. FIDEICOMISO'S funding comes from, in order of importance, the World Bank, operational revenues and federal funds. It is a second tier financial institution operating through the commercial banking system, the latter providing the retail role. In 1987 and 1988 the FIDEICOMISO approved credits for $23 million and $46 million respectively. 相似文献