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21.
The aim of this work has been to assess the accumulation of copper, zinc, cadmium and lead by a test alga, Scenedesmus obliquus, under nongrowth conditions. The results provide an evidence that metals can be readily accumulated by algae and that accumulation is a function of the metal-to-algae exposure ratio. When the metals were added in combination in equimolar concentrations, the following order of affinity to algal surface was detected Zn > Cu ? Cd > Pb. However, when EDTA was added to the test water, metal accumulation was greatly retarded. Moreover, when algae loaded with one of the metals were washed with EDTA solution the major part of the accumulated metal was mobilized, indicating that EDTA had stronger metal binding affinity than any ligands liable to exist on algal surface. Metal accumulation by algal cells isolated from a culture in the logarithmic growth phase was of much higher magnitude than that displayed by cells isolated from a culture in the decline phase. 相似文献
22.
The purpose of this paper is to apply a stress model drawn from the literature to the relief and social service workers who have been active in refugee camps for a prolonged period of time. Working in difficult environments, social service workers deliver essential services to refugee populations around the world. A model of four work-stress determinants--tasks, management, appreciation and collaboration--was tested on 274 social workers in five regions of the Middle East (Jordan, Lebanon and Syria, as well as the occupied Palestinian territories of the Gaza Strip and the West Bank). Statistical fit indices were adequate but two relationships were statistically insignificant. The collaboration variable was dropped to create a modified model with tasks indirectly and management and appreciation directly affecting work-related stress. The five direct relationships and two indirect relationships of this modified model are consistent with stress theory, and all relationships--direct and indirect--are statistically significant. 相似文献
23.
Eshraq Ahmed Abdullah Abdul Halim Abdullah Zulkarnain Zainal Mohd Zobir Hussein Tan Kar Ban 《环境科学学报(英文版)》2012,24(10):1876-1884
A modified hydrophilic penta-bismuth hepta-oxide nitrate (Bi5O7NO3) surface was synthesized via a precipitation method using TiO2 and Ag as modified agents. The synthesized product was characterized by different analytical techniques. The removal efficiency was evaluated using mono-and di-sulphonated azo dyes as model pollutants. Different kinetic, isotherm and diffusion models were chosen to describe the adsorption process. X-ray photoelectron spectroscopy (XPS) results revealed no noticeable differences in the chemical states of modified adsorbent when compared to pure Bi5O7NO3;however, the presence of hydrophilic centres such as TiO2 and Ag developed positively charged surface groups and improved its adsorption performance to a wide range of azo dyes. Dyes removal was found to be a function of adsorbent dosage, initial dye concentration, solution pH and temperature. The reduction of Langmuir 1,2-mixed order kinetics to the second or first-order kinetics could be successfully used to describe the adsorption of dyes onto the modified adsorbent. Mass transfer can be described by intra-particle diffusion at a certain stage, but it was not the rate limiting step that controlled the adsorption process. Homogenous behavior of adsorbent surface can be explored by applying Langmuir isotherm to fit the adsorption data. 相似文献
24.
The cytotoxicity of the fungicides benalaxyl, metalaxyl, and triadimefon was evaluated in vitro using the Chinese hamster ovary (CHO-K1) cell line. The midpoint cytotoxicity values of neutral red (NR) incorporation (NRI50), total cellular protein content (TCP50), and the methyl tetrazolium assay (MTT50) were estimated. Benalaxyl was the most cytotoxic fungicide, followed by metalaxyl and triadimefon. Fetal calf serum (10%) caused a reduction in benalaxyl, metalaxyl, and triadimefon cytotoxicity by factors of 1.8, 1.3, and 1.3. The effects of sublethal concentrations (NRI25) of the three fungicides on the glutathione redox cycle components glutathione S-transferase, glutathione reductase, glutathione peroxidase, and total glutathione content were studied. The ameliorative effects of extracellular glutathione (1 mmol L?1), vitamin C (70 µmol L?1), and vitamin E (30 µmol L?1) were also investigated. The three antioxidants led to significant effects on the glutathione redox cycle components. 相似文献
25.
The adsorption of some heavy metals onto the walls of harvested, washed, and dried non-living biomass cells of different Pseudomonas strains was studied at optimum experimental conditions using a simplified single component system. The Langmuir adsorption model was found to be a suitable approach to describe the system via multi-step processes. Isotherms measured at 30.0°C and pH 5.5 with [M]total?=?10–100 mM for tight, reversible Cr6+(aq), Ni2+(aq), Cu2+(aq) and Cd2+(aq) binding by the cell walls of the investigated biomass fit the Langmuir model and give the pH-independent stoichiometric site capacities ν i and equilibrium constants K i for metal binding at specific biomass sites i?=?A, B, C, and D. Tight binding sites A, B, and D of the non-living biomass are occupied by CrVI, sites A and C by NiII, sites A and D by CdII, and only site B by CuII. It is concluded that ν i is a stoichiometric parameter that is independent of the magnitude of K i for binding site i and that the studied heavy metals selectively and tightly bind at different biomass sites. 相似文献
26.
Olalekan S. Fatoki Hussein K. Okoro Folahan A. Adekola Bhekumusa J. Ximba Reinette G. Snyman 《The Environmentalist》2012,32(1):48-57
Heavy metal concentrations in black mussels (Mytilus
galloprovincialis) collected from Cape Town Harbour were determined using energy dispersive X-ray fluorescence (EDXRF) and inductively coupled
plasma-mass spectrometry (ICP-MS). EDXRF showed that tissue portions of the mussels contained K, Ca, Fe, Cu, Zn, Si, Sr, Al
and Au, while the shell portion contained K, Ca, Fe, Cr, Zn, Si and Sr. In addition to these metals, EDXRF also revealed the
presence of Al in the shells of the largest mussels. Highest concentrations of Cu and Zn were recorded in the tissues of the
smallest mussels. Due to poorer detection limits of EDXRF, ultra-trace elements (Mn, Pb, As, Hg, V, Cr, Sn, Cd, Ni and Co)
were determined in mussels using ICP-MS. The average metal concentrations found in the mussels are as follows; Pb (7.30 ± 0.67),
Cd (1.98 ± 0.13), Hg (4.92 ± 0.60), As (6.94 ± 0.04), Sn (2.63 ± 0.13), Ni (1.88 ± 0.05), Cr (3.54 ± 0.05), V (4.17 ± 0.23),
Co (0.74 ± 0.01) and Mn (35.20 ± 1.46). ANOVAs, Pearson correlation and principal component analysis (PCA) were employed in
data analysis. The order of the abundance of metals in the mussels is Mn > Pb > As > Hg > V > Cr > Sn > Cd > Ni > Co. The
average metal concentrations found in the mussels were higher than the permissible Food and Agriculture Organization (FAO)
limits and other international guidelines. 相似文献
27.
Seddeek MK Sharshar T Ragab HS Badran HM 《Journal of environmental monitoring : JEM》2005,7(8):767-770
Natural radioactivity concentrations due to the coal mining in Gabal El-Maghara, North Sinai, Egypt, were determined using gamma-ray spectroscopy. Coal, water and soil samples were investigated in this study. The (226)Ra, (232)Th and (40)K activity concentrations in coal before extraction were 18.5 +/- 0.5, 29.5 +/- 1.2 and 149.0 +/- 8.4 Bq kg(-1), respectively. These concentrations were reduced to 18-22% after extraction due to the clay removal of the coal ore. The activity contents of the water and soil samples collected from the surrounding area did not show any evidence of enhancement due to the mining activities. Absorbed dose rate and effective dose equivalent in the mine environment were 29.4 nGy h(-1) and 128.0 microSv a(-1), respectively. The measured activity concentrations in the mine environment and the surrounding areas (5 km away from the mine) are similar to that found in other regions in North and South Sinai. Based on the measurements of gamma-ray emitting radionuclides, the mine activity does not lead to any enhancement in the local area nor represents any human risk. 相似文献
28.
Luswaga Hussein Nuppenau Ernst-August 《Environment, Development and Sustainability》2022,24(10):11651-11675
Environment, Development and Sustainability - Despite the importance of forests to the communities in rural Tanzania, information is scarce regarding the contribution of non-timber forest products... 相似文献
29.
Elfadadny Ahmed El-Husseiny Hussein M. Abugomaa Amira Ragab Rokaia F. Mady Eman A. Aboubakr Mohamed Samir Haney Mandour Ahmed S. El-Mleeh Amany El-Far Ali H. Abd El-Aziz Ayman H. Elbadawy Mohamed 《Environmental science and pollution research international》2021,28(36):49447-49466
Environmental Science and Pollution Research - Cancer, a major public health problem, is one of the world’s top leading causes of death. Common treatments for cancer include cytotoxic... 相似文献
30.
Giuseppe Mascaro Abdinur Hussein Aubrey Dugger David J. Gochis 《Journal of the American Water Resources Association》2023,59(1):49-70
The National Water Model (NWM) will provide the next generation of operational streamflow forecasts across the United States (U.S.) using the WRF-Hydro hydrologic model. In this study, we propose a strategy to calibrate 10 parameters of WRF-Hydro that control runoff generation during floods and snowmelt seasons, and due to baseflow. We focus on the Oak Creek Basin (820 km2), an unregulated mountainous sub-watershed of the Salt and Verde River Basins in Arizona, which are the largest source of water supply for the Phoenix Metropolitan area. We calibrate the model against discharge observations at the outlet in 2008–2011, and validate it at two stream gauging stations in 2012–2016. After bias correcting the precipitation forcings, we sequentially modify the model parameters controlling distinct runoff generation processes in the basin. We find that capturing the deep drainage to the aquifer is crucial to improve the simulation of all processes and that this flux is mainly controlled by the SLOPE parameter. Performance metrics indicate that snowmelt, baseflow, and floods due to winter storms are simulated fairly well, while flood peaks caused by summer thunderstorms are severely underestimated. We suggest the use of spatially variable soil depth to enhance the simulation of these processes. This work supports the ongoing calibration effort of the NWM by testing WRF-Hydro in a watershed with a large variety of runoff mechanisms that are representative of several basins in the southwestern U.S. 相似文献