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71.
Dias Marcela França Leroy-Freitas Deborah Machado Elayne Cristina da Silva Santos Leticia Leal Cintia Dutra da Rocha Fernandes Gabriel de Araújo Juliana Calábria 《Environmental science and pollution research international》2022,29(24):36088-36099
Environmental Science and Pollution Research - Wastewater tertiary treatment has been pointed out as an effective alternative for reducing the concentration of antibiotic resistant bacteria and... 相似文献
72.
Fernando Bonilla-Musoles Luis E. Machado Newton G. Osborne Elkin A. Muñoz Francisco Raga Javier Blanes Francisco Bonilla Jr 《黑龙江环境通报》2001,21(8):622-626
A comparison between two-dimensional (2D), and three-dimensional (3D) ultrasonography was made in four fetuses diagnosed with neural tube defect (NTD) in the first half of pregnancy. 3D ultrasonography (orthogonal and multiplanar systems) proved to be an excellent complement to 2D, particularly when using orthogonal planes. When using the 3D multiplanar surface imaging system, excellent images of the malformations can be rapidly obtained. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
73.
Sandro Froehner Marcell Maceno Karina Scurupa Machado 《Environmental monitoring and assessment》2011,174(1-4):135-145
The presence of polycyclic aromatic hydrocarbon (PAH) compounds in sediment and water samples collected in the estuary area of Paranagua, southern Brazil, was investigated. There is a lot of port activity in the region. Recreational fishing is widespread; thus, there is concern about possible contamination by PAHs. The 16 priority PAHs were investigated, and only eight were found. The total concentration of PAHs ranged from 40.8 to 406.8 ng/g. High molecular weight were the most abundant, while PAHs with a low molecular weight were absent. There are suspicions that the main source of PAHs is combustion, but some uncertainties exist, and there may even be the presence of PAHs resulting from accidental spills of crude oil. Although the sediments contain PAHs, the amount is below the maximum concentrations allowed by the Brazilian environmental legislation, as well as the maximum levels at which adverse effects are observed. From the analytical results, a probable bioaccumulation was assessed in the local trophic chain using a mathematical model (Arnot and Gobas, Environ Toxicol Chem 23(10):2343?C2355, 2004). The model showed that there is a possibility of biomagnification along the food chain selected. Three fishes with high local consumption were selected, and the concentration of some PAHs could be found in those fishes. 相似文献
74.
Mariane de Fátima Yukie Maeda Maria de Lourdes Brizot Maria Augusta Bento Cicaroni Gibelli Silvia Maria Ibidi Werther Brunow de Carvalho Mara Sandra Hoshida Clarisse Martins Machado Ester Cerdeira Sabino Lea Campos de Oliveira da Silva Thomas Jaenisch Maria Cássia Jacintho Mendes-Correa Philippe Mayaud Rossana Pulcinelli Vieira Francisco HC-FMUSP-Obstetric COVID Study Group 《黑龙江环境通报》2021,41(8):998-1008
75.
de Araujo Helder F. P. Machado Célia C. C. Alves Ana Carolina Flores da Costa Lima Mônica da Silva José Maria Cardoso 《Mitigation and Adaptation Strategies for Global Change》2022,27(8):1-18
Mitigation and Adaptation Strategies for Global Change - All Clean Development Mechanism (CDM) projects are designed to contribute to the sustainable development of the host country. Livelihood is... 相似文献
76.
Brood desertion is a life history strategy that allows parents to minimize costs related to parental care and increase their future fecundity. The harvestman Neosadocus maximus is an interesting model organism to study costs and benefits of temporary brood desertion because females abandon their clutches periodically and keep adding eggs to their clutches for some weeks. In this study, we tested if temporary brood desertion (a) imposes a cost to caring females by increasing the risk of egg predation and (b) offers a benefit to caring females by increasing fecundity as a result of increased foraging opportunities. With intensive field observations followed by a model selection approach, we showed that the proportion of consumed eggs was very low during the day and it was not influenced by the frequency of brood desertion. The proportion of consumed eggs was higher at night and it was negatively related to the frequency of brood desertion. However, frequent brood desertion did not result in higher fecundity, measured both as the number of eggs added to the current clutch and the probability of laying a second clutch over the course of the reproductive season. Considering that harvestmen are sensitive to dehydration, brood desertion during the day may attenuate the physiological stress of remaining exposed on the vegetation. Moreover, since brood desertion is higher during the day, when egg predation pressure is lower, caring females could be adjusting their maternal effort to the temporal variation in predation risk, which is regarded as the main cost of brood desertion in ectotherms. 相似文献
77.
Although studies classify the polygynous mating system of a given species into female defense polygyny (FDP) or resource defense
polygyny (RDP), the boundary between these two categories is often slight. Males of some species may even shift between these
two types of polygyny in response to temporal variation in social and environmental conditions. Here, we examine the mating
system of the Neotropical harvestman Acutisoma proximum and, in order to assess if mate acquisition in males corresponds to FDP or RDP, we tested four contrasting predictions derived
from the mating system theory. At the beginning of the reproductive season, males fight with other males for the possession
of territories on the vegetation where females will later oviposit, as expected in RDP. Females present a marked preference
for specific host plant species, and males establish their territories in areas where these host plants are specially abundant,
which is also expected in RDP. Later in the reproductive season, males reduce their patrolling activity and focus on defending
individual females that are ovipositing inside their territories, as what occurs in FDP. This is the first described case
of an arachnid that exhibits a shift in mating system over the reproductive season, revealing that we should be cautious when
defining the mating system of a species based on few observations concentrated in a brief period.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
78.
Alexandre da Silveira Gerzson Denise Cantarelli Machado Rafaela Radomski da Silva Cristhiane Alvim Valente Rogério Miranda Pagnoncelli 《Journal of Polymers and the Environment》2018,26(3):906-912
Developing a biomaterial that functions as a scaffold (osteoconductor), combined with a growth factor (osteoinductor), is of great interest for clinical application in oral and maxillofacial surgery. Growth hormone (GH) is a good candidate, as it is a major regulator of postnatal bone growth and remodeling. Pure PLGA and 70/30 PLGA/PCL matrices were prepared by the solvent evaporation method, combined or not with GH, and tested for toxicity and cell viability using an MTT assay with NIH3T3 mouse cells (ATCC). Cell toxicity was assessed at 24, 48, 72 h, and 7 days of biomaterial exposure to culture medium. All polymers had high cell viability rates. However, from 48 h onwards, the groups with GH-polymer combinations had better results than the polymer groups without association with GH when compared to the control group. At 7 days of culture, only the pure PLGA matrix showed a significant difference from the control group. These results may suggest a preference of cells for the presence of GH in the biomaterial in culture medium, especially in the PLGA matrix. GH appeared to contribute to the increase in cell viability observed at some assessment time points, especially when combined with PLGA as compared to pure PLGA. 相似文献
79.
Priscilla Araújo Victor Sílvia Belém Gonçalves Fabricio Machado 《Journal of Polymers and the Environment》2018,26(5):1755-1774
A modified sequential mass-suspension polymerization was employed to ensure adequate dispersion of lignin into the monomeric phase. Due to its complex macromolecular structure and low compatibility with styrene, eucalyptus wood-extracted lignin, via a modified Kraft method, was esterified with methacrylic anhydride to ensure organic phase homogeneity into the reaction medium. Infrared spectroscopy showed a decrease in the hydroxyl band, a characteristic of natural lignin (3200–3400 cm?1) and an increase in the characteristic ester band (1720–1740 cm?1) whereas nuclear magnetic resonance measurements exhibited intense peaks in the range from 1.7 to 2.05 ppm (–CH3) and 5.4 to 6.2 ppm (=CH2), related to methacrylic anhydride. Comparatively, the esterified lignin also displayed an increase of its glass transition temperature for 98?°C, related to natural lignin, whose T g was determined to be equal to 91?°C. Styrene/lignin-based polymers exhibited higher average molar masses in comparison to the values observed for polystyrene synthesized with similar amounts of benzoyl peroxide, due to the ability of lignin to act as a free-radical scavenger. Composites obtained with styrene and natural or esterified lignin were successfully synthesized, presenting regular morphology and proper lignin dispersion. Based on a very simple polymerization system, it is possible to enhance the final properties of polystyrene through the incorporation of lignin, which represents an important platform for developing attractive polymeric materials from renewable resources. 相似文献
80.
Silveira Elizandro Oliveira Moura Daiane Rieger Alexandre Machado Ênio Leandro Lutterbeck Carlos Alexandre 《Environmental science and pollution research international》2017,24(25):20469-20478
Environmental Science and Pollution Research - The present study investigated the performance of an integrated system, combining the sequential use of microalgae (MA) and vertical flow constructed... 相似文献