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261.
Pietro Tundo Stefano Raccanelli Laila A. Reda Mohamed Tawic Ahmed 《Chemistry and Ecology》2004,20(4):257-265
Lake Temsah is one of the main wetlands in the Suez Canal region, and the main source for fish for the area. The lake is the end-point of several wastewater effluents. In the present study, residues of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), dioxin-like polychlorinated biphenyl (PCB) and polycyclic aromatic hydrocarbons (PAH) were monitored in the sediment of the lake. Samples were collected from six different sampling stations around the lake using a box-corer sampler, then kept frozen. Samples were extracted and cleaned up before residue determination was conducted using an HRGC/HRMS. An HP 6890 plus gas chromatograph was coupled to a Micromass Autospec Ultima mass spectrometer operating in EI mode at 35 eV and with a resolution of 10.000 (5% valley). PCDDs and PCDFs were detected in all sediment samples collected from various sampling stations. Results showed some progressive increase in PCDDs concentrations relevant to increase in chlorination. In the PCDD group of congeners, 1, 2, 3, 4, 6, 7, 8, 9 octa-CDD had the highest detected concentrations in all samples, while 2, 3, 7, 8 tetra-CDD showed the lowest concentrations. The World Health Organization toxicity equivalents ranged from 0.387 to 11.20 ng kg-1 d.w. For PCDD homologues, hexa-CDD was the most dominant homologue in all sediment samples analysed. Regarding dioxin-like PCBs, results showed that IUPAC No. 118 congener, 2, 3, 4, 4, 5, pentachlorobiphenyl was the most concentrated of all detected congeners, with concentrations ranging between 0.039 and 43.201 µg kg-1. For polycyclic aromatic hydrocarbons, benzo(b+k+j)fluoranthene had the highest concentrations in almost all sampling stations. However, fluorene was the smallest detected concentration in almost all stations. This result would indicate that PAH contamination of the lake seems to be coming from one main source in all sampling stations. The present work is the first record of PCCDs, PCCFs, and dioxin-like PCBs in the Temsah lake. The concentrations of the contaminants monitored in this study, especially those of PAHs, are rather alarming. Efforts should be made to stop point sources that contaminate the lake. 相似文献
262.
The population structure of 4 species of porcellanid crabs, including 2 species of Petrolisthes (P. boscii and P. rufescens) and 2 of Pachycheles (P. tomentosus and P. natalensis) was investigated. Sex ratios deviated from the expected 1:1 distribution in some size classes of the 4 species, but conformed in general to this pattern on the entire population basis. Probability curves developed from sex ratios differ markedly in shape and slope and resemble Wenner's (1972) anomalous and intermediate types. Ovigerous females of Petrolisthes boscii occurred for 9 months, of P. rufescens for 11 months; those of Pachycheles tomentosus and P. natalensis occurred throughout the year. In every size class, a considerably higher number of female Pachycheles tomentosus and P. natalensis became ovigerous than in Petrolisthes boscii and P. rufescens. Size-frequency distributions of the 4 species were unimodal, indicating that recruitment to crab populations was gradual. Juveniles of Petrolisthes boscii and P. rufescens were most abundant towards the commencement of the southwest monsoon season, in June–July; juveniles of Pachycheles tomentosus and P. natalensis were most abundant during the premonsoon month of March. Thirteen percent of Pachycheles natalensis were infected by a bopyrid parasite; the bopyrid also infected 5.2% of Petrolisthes rufescens and 0.6% of P. boscii. The latter two species were also infected by a rhizocephalan parasite, the infection rates being inverse to those by the bopyrid, i.e., 0.3 and 6.4%, respectively. 相似文献
263.
Ahmed S. Moursy 《Environment international》1983,9(2):107-111
A survey of oil and grease along the Nile River indicated the presence of variable concentrations of these pollutants. It was found that some stations along the Nile are more polluted than others. These are located mostly at lake Nasser port (Aswan segment); oil distribution centers and ship waiting areas (Assiut segment); boat docks, a ship yard, and an electric power station (Cairo segment); and at factory areas (Rossetta segment). The level of oil and grease decreased significantly when moving downstream. In addition, the level of oil and grease along the river was lower in summer than in winter and spring. This may be attributed to the decrease of activities and increase of vaporization processes. 相似文献
264.
265.
The capabilities of some building materials used in Jordan to attenuate gamma radiation were tested. Measurements of the attenuation coefficients of limestone, bricks and concrete have been carried out using a HPGe-spectrometer. Narrow beam technique was used, with a multiple gamma radiation source of different energy lines. Results indicate that variations in the attenuation coefficient for all limestone samples, at the same energy line, are within the experimental uncertainties. On the basis of the results achieved, an empirical formula mu(m)=AE(-0.44) was proposed to calculate attenuation at various incident energies. Limestone of average thickness 7cm was found to stop 75% of a gamma beam of energy 662keV. Meanwhile a brick of effective thickness 7cm was found to stop 60% of the same beam. The total attenuation coefficient of concrete calculated at 1333keV was 11.2m(-1), which is less than that of limestone and bricks. 相似文献
266.
267.
Farghali Mohamed Osman Ahmed I. Umetsu Kazutaka Rooney David W. 《Environmental Chemistry Letters》2022,20(5):2853-2927
Environmental Chemistry Letters - The Ukraine conflict has put critical pressure on gas supplies and increased the price of fertilisers. As a consequence, biogas has gained remarkable attention as... 相似文献
268.
Behl Tapan Gupta Amit Sehgal Aayush Singh Sukhbir Sharma Neelam Garg Madhukar Bhatia Saurabh Al-Harrasi Ahmed Aleya Lotfi Bungau Simona 《Environmental science and pollution research international》2022,29(24):35643-35656
Environmental Science and Pollution Research - Diabetes is one of the most comprehensive metabolic disorders and is spread across the globe. The data from IDF Diabetes Atlas and National Diabetes... 相似文献
269.
Liu Dong Xie Yuantao Hafeez Muhammad Usman Ahmed 《Environmental science and pollution research international》2022,29(20):29746-29755
Environmental Science and Pollution Research - This study examines the role of financial inclusion on the environment-economic performance in the top five Asian emerging economies. The data used... 相似文献
270.
Kalra Sunishtha Banderwal Rittu Arora Kaushal Kumar Sandeep Singh Govind Chawla Pooja A. Behl Tapan Sehgal Aayush Singh Sukhbir Bhatia Saurabh Al-Harrasi Ahmed Aleya Lotfi Dhiman Anju 《Environmental science and pollution research international》2022,29(12):16786-16798
Environmental Science and Pollution Research - Traumatic brain injury (TBI) is a neurological disorder which represents a major health issue worldwide. It causes mortality and disability among all... 相似文献