排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
Panagiotou Constantinos F. Stefan Catalin Papanastasiou Panos Sprenger Christoph 《Environmental science and pollution research international》2023,30(6):14424-14438
Environmental Science and Pollution Research - A quantitative microbial risk assessment was conducted to assess the health risks associated with the exposure of agricultural workers to tertiary... 相似文献
2.
Simona Caprarescu Mihai Cosmin Corobe Violeta Purcar Catalin Ilie Spataru Raluca Ianchis Gabriel Vasilievici Zina Vuluga 《环境科学学报(英文版)》2015,35(9):27-37
Heterogeneous membranes were obtained by using styrene-acrylonitrile copolymer (SAN) blends with low content of ion-exchanger particles (5 wt.%). The membranes obtained by phase inversion were used for the removal of copper ions from synthetic wastewater solutions by electrodialytic separation. The electrodialysis was conducted in a three cell unit, without electrolyte recirculation. The process, under potentiostatic or galvanostatic control, was followed by pH and conductivity measurements in the solution. The electrodialytic performance, evaluated in terms of extraction removal degree (rd) of copper ions, was better under potentiostatic control then by the galvanostatic one and the highest (over 70%) was attained at 8 V. The membrane efficiency at small ion-exchanger load was explained by the migration of resin particles toward the pores surface during the phase inversion. The prepared membranes were characterized by various techniques i.e. optical microscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and differential thermal analysis and contact angle measurements. 相似文献
3.
Fabiola?G.?Arcos Ilie?S.?Racotta Elena?Palacios Ana?M.?IbarraEmail author 《Marine Biology》2005,148(2):339-346
Besides some mammals and a few model organisms, the presence of genetic variation in ovary or gonad development at ages before that of reproduction has not been established for marine oviparous species nor has the correlation with reproductive traits at maturity. In this investigation, ovary development was evaluated for genetic variability in a full-sib family structured population of subadult shrimp. The numbers of each oocyte type that were present were counted, measured, and used to evaluate the following traits: total oocyte number, mean oocytes diameter, and ovary maturity (OM). The total ovary area was also measured for each female. Genetic variation was assessed through the estimation of the parameter ‘heritability’. The heritability (h
2) of total number of oocytes was zero, but large heritability values were seen for mean oocytes diameter (h
2=0.57±0.27) and OM (h
2=0.71±0.26). Family means correlations between traits in subadults with traits measured in their full-sibs when adults (days to first spawn, total number of spawns, total fecundity, and fecundity at first spawn) indicated the existence of some significant associations between reproductive traits at the two ages. These findings point toward an early genetic determination of reproductive capacity in this crustacean. 相似文献
4.
Monitoring pollution in River Mureş, Romania, part II: metal accumulation and histopathology in fish
Triebskorn R Telcean I Casper H Farkas A Sandu C Stan G Colărescu O Dori T Köhler HR 《Environmental monitoring and assessment》2008,141(1-3):177-188
As a part of an exposure and effect monitoring conducted along the river Mureş, Western Romania in 2004, the health status
of two indigenous fish species, sneep (Chondrostoma nasus) and European chub (Leuciscus cephalus) was investigated upstream and downstream the city of Arad. In fish, histopathology was assessed in liver and gills, and
heavy metals (cadmium, copper, lead and zinc) were analyzed in liver samples. In both fish species, histopathological reactions
in the gills (epithelial lifting, focal proliferation of epithelial cells of primary and secondary lamellae and resulting
fusion of secondary lamellae, hyperplasia and hypertrophy of mucous cells, focal inflammation and necrosis of epithelial cells)
were most severe at the two sampling sites upstream Arad city, which were shown to be polluted by copper, cadmium, faecal
coliforms and streptococci in a parallel study. At these two sites, also histopathology in the liver of L. cephalus was more prominent than at the two downstream sites. In C. nasus, symptoms in the liver (focal inflammation with lymphocytic infiltrations, macrophage aggregates and single cell necrosis)
were also highly pronounced at the sampling site located directly downstream the municipal sewage treatment plant of Arad.
With the exception of copper accumulation in L. cephalus caught at the most upstream sampling site, in both fish species cadmium and copper accumulation were exceptionally high and
did not differ significantly between the four sampling sites. 相似文献
5.
Ilie S. Racotta Elena Palacios Ana M. Ibarra José Luis Ramírez Fabiola Arcos Olivia Arjona 《Marine Biology》2008,153(6):1245-1256
Induction of triploidy in aquatic organisms has increased worldwide in the last two decades, mostly because triploids have
better growth than diploids. According to a physiological hypothesis, partial or total sterility of triploids allows the accumulation
of reserves in muscle and other tissues instead of being transferred to the gonad. The present study analyzes lipid, protein,
carbohydrate, and fatty acid levels in muscle and gonads of Nodipecten subnodosus triploids and diploids over 18 months from June 2001 to December 2002. An important increase in gonadosomatic index of diploids
scallops was observed from May to June 2002 reaching the highest values in August. Such increase was not observed in triploid
scallops. Changes in biochemical composition in female gonad were in general related to the accumulation of reserves during
gonad development of diploid scallops. This accumulation was lower for triploid scallops, in accordance to their sterility,
especially for carbohydrates and acylglycerides. Adductor muscle index as well as protein and carbohydrate levels in muscle
increased in both ploidy groups during the reproductive period indicating no mobilization of reserves to sustain gonad development
in both ploidy groups. These results partially support the physiological hypothesis on the advantage of triploids: in a rich
food locality no mobilization of reserves is needed to sustain gametogenesis. This, together with a possible lower efficiency
of energy assimilation at high food concentration for triploids, may be the reason for an apparent lack of superiority of
N. subnodosus triploids in terms of adductor muscle growth. Only the levels of particular highly unsaturated fatty acids levels (namely
20:4n-6 and 20:5n-3) in muscle of diploid and triploid decreased during the reproductive period, indicating a possible transfer of selected
fatty acids to gonads, even in triploids. The muscle of triploids has a slightly but significantly higher proportion of 22:6n-3 compared to diploids, which can have implications for the nutritional and commercial value of triploid adductor muscle. 相似文献
6.
Prabu Arulraj Simon Chithambaram Venkatesan Bennet Maria Anto Shanmugan Sengottaiyan Pruncu Catalin Iulian Lamberti Luciano Elsheikh Ammar Hamed Panchal Hitesh Janarthanan Balasundaram 《Environmental science and pollution research international》2022,29(11):15863-15875
Environmental Science and Pollution Research - The unavailability of sunlight during nighttime and cloudy weather condition has limited the usage of solar cookers throughout the day. This study... 相似文献
7.
8.
Comparison of advanced oxidation processes and identification of monuron photodegradation products in aqueous solution 总被引:2,自引:0,他引:2
The photodegradation of monuron (3-(4-chlorophenyl)-1,1-dimethylurea) in aqueous solutions under simulated solar irradiation has been conducted by different advanced oxidation processes (UV/H(2)O(2), UV/H(2)O(2)/Fe(2+), UV/H(2)O(2)/TiO(2), UV/TiO(2), dark H(2)O(2)/Fe(3+)). The degradation rates were always higher for the homogeneous catalysis in photo-Fenton reactions (UV/H(2)O(2)/Fe(2+)) compared to the heterogeneous photocatalytic systems (TiO(2)/UV and UV/H(2)O(2)/TiO(2)). Optimal concentrations of Fe(2+) and H(2)O(2) for the abatement of the herbicide in the photo-Fenton system were found to be 1 mM Fe(II) and 10 mM H(2)O(2). Several intermediary products were identified using large volume injection micro-liquid chromatography with UV detection (mu-LC-UV), mu-LC-MS and GC-MS techniques and a degradation mechanism has been proposed. 相似文献
9.
Viorel?BlujdeaEmail author David?Neil?Bird Gerald?Kapp Martin?Burian Ilie?Silvestru?Nuta Liviu?Ciuvat 《Mitigation and Adaptation Strategies for Global Change》2011,16(4):463-476
Initiatives for reducing anthropogenic greenhouse gas emissions from deforestation and degradation require transparent and
robust methodologies for the estimation of emissions reduction or removal. Although carbon (C) stock change in degradation
and devegetation by remote sensing are becoming increasingly powerful, the drivers of degradation, wood collection and harvest
dynamics, cannot be understood without “on the ground” sampling. A methodological tool for the quantitative and qualitative
analysis of forest degradation is proposed as developed based on a research on the stump history in the black locust degrading
stands sampled in southwest Romania. Based on the survey of stumps, the cutting regime and wood extraction is determined over
a past period of some 15 years. Stump age classification comprises multiple qualitative criteria (i.e. bark features; adherence
of sprouts; cut edge features; etc.). The method allows for a quantitative assessment of wood removal over time, and is suitable
for the development of a dynamic baseline and monitoring of degradation avoidance activities. 相似文献
10.