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排序方式: 共有114条查询结果,搜索用时 15 毫秒
31.
Adel Abdelkader Ahmed I. Osman Samih A. Halawy Mohamed A. Mohamed 《Journal of Material Cycles and Waste Management》2018,20(3):1428-1436
The present study includes synthesis of two γ-Al2O3 samples from waste aluminum cans using a simple precipitation method. Precipitation was carried out using two different precipitating agents (i.e. NaOH and NH4OH). The two prepared alumina samples were characterized by means of X-ray diffraction (XRD) and N2 adsorption–desorption techniques. Surface acidity of γ-Al2O3 samples was measured by adsorption of two different probe molecules (i.e. pyridine and dimethyl pyridine) followed by desorption measurements using thermogravimetry (TG) and differential scanning calorimetry (DSC) techniques. Catalytic activity of the two prepared alumina samples towards the dehydration of methanol (to dimethyl ether) was studied in a fixed bed reactor at 300 °C. For comparison reasons, commercial γ-Al2O3 sample was, also, tested for the same catalytic reaction under the same conditions. Results showed that the alumina sample prepared using NaOH as a precipitating agent exhibited a better catalytic activity and stability compared with that prepared using NH4OH and showed a similar activity as the commercial γ-Al2O3 sample. 相似文献
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Persistence of carbaryl in canal water 总被引:2,自引:0,他引:2
The presence of the insecticide carbaryl (Sevin) and its decomposition product 1-napthol was confirmed in irrigation and drainage canal water. However, their residues disappeared from the water 6 days after application. 相似文献
34.
Onder Erguven Gokhan Tatar Şule Serdar Osman Yildirim Nuran Cikcikoglu 《Environmental science and pollution research international》2021,28(3):2871-2879
Environmental Science and Pollution Research - This study reveals out detoxifying and antioxidant enzyme response of Gammarus pulex exposed/polluted to chlorpyrifos-ethyl insecticide before and... 相似文献
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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
38.
3,4-Annelated coumarin-pyrimido-pyrimidine systems (7-imino-8-mercapto-7H-5-oxa-7a,9,12-triaza-benzo[a]anthracen-6-one 2 and 8-hydroxy-7-imino-10-methyl-7H-5-oxa-7a,9,12-triaza-benzo[a]anthracen-6-one 3) were synthesized by the action of 4-amino-2-mercapto-pyrimidine, 2-amino-4-hydroxy-6-methylpyrimidine, respectively, on 4-chlorocoumarin-3-carbonitrile 1. The synthesized compounds were examined for in vitro antibacterial activity against 4 bacterial cultures: Staphylococcus aureus, Streptococcus pneumonia, Escherichia coli, and Aeromonas Salmonicida. The antibacterial activity of synthesized compounds 2 and 3 was compared to antibacterial activity of novobiocin as a standard drug. 相似文献
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Apple, grape, and apple juice were analyzed for pesticides using a multireaction mode (MRM) method in samples taken from a Kosovo market. With this method it was possible to analyze about 100 pesticides in the ESI mode. In these samples some types of pesticides were found, but most of them did not exceed the maximum tolerance levels. In apple samples, six pesticides were detected but only three of them were in sufficient quantitites. Dimethoat was below the limit, while acephate and imazalil exceeded the limit. In grape and apple juice samples, all of pesticides which were found did not exceed the maximum tolerable limits. 相似文献
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Aygül Kü?ükgülmez Osman Gülnaz Mehmet Celik Yasemen Yanar A. Eslem Kadak G?zde Ger?ek 《Journal of Polymers and the Environment》2012,20(2):431-437
In the study, chitosan chemically extracted from Metapenaeus stebbingi shells obtained from shrimp processing factories and commercial chitosan were used as antimicrobial materials. Antimicrobial activities of the chitosans dissolved in acetic, lactic, formic and hydrochloric acid at different concentrations (1.00, 0.50, 0.25, 0.10 and 0.05%) were tested in vitro by using the disk diffusion method with standard microorganisms (Pseudomonas putida, Pseudomonas fluorescens, Vibrio parahaemolyticus, Staphylococcus epidermidis, Staphylococcus aureus, Escherichia coli 1, Escherichia coli 2, Listeria monocytogenes, Enterecoccus faecalis, Aeromonas caviae). On the other hand, gentamicin was used as positive control. Antimicrobial test results indicated that chitosan demonstrated different effects depending on the chitosan concentration, solvent material and bacteria type. In the present study, both the extracted and commercial chitosans were observed to have antimicrobial effects on nearly all types of the bacteria. 相似文献