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Wyszukujesz frazę "Abdallah, I." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Dissipation of methomyl residues in tomato fruits, soil and water using LC-MS/MS
    Autorzy:
    El-Hefny, D.
    Abdallah, I.
    Helmy, R.
    Mahmoud, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084623.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dissipation
    LC-MS/MS
    methomyl
    tomato
    QuEChERS
    Opis:
    Tomato is an economically important vegetable crop which is attacked heavily by insect pests leading to reduction of yield and quality of the fruits. Field experiments were carried out to investigate the dissipation of methomyl (a common insecticide) used mainly on tomato fruits. LC-MS/MS coupled with the QuEChERS method were used for the determination of methomyl. The results showed that the recovery using matrix-matched standards ranged from 87.8 to 101.3%, with relative standard deviation of 2.5 to 7.5%. Kinetics equation, Log R = log R0 – 0.434 Kt, was used to calculate the rate of degradation in tomato, soil and water. Residue half-life calculated using kinetic rate ranged from 1.95 to 1.63 days in tomato and soil, respectively. From the results it was concluded that tomato fruits can be safely harvested for consumption after 15 days of application based on estimated preharvest interval (PHI). It is advisable to re-estimate the PHI regularly owing to data from the EU and Codex.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 3; 355-361
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of detoxifying enzymes in the resistance of the cowpea aphid (Aphis craccivora Koch) to thiamethoxam
    Autorzy:
    Abdallah, I.S.
    Abou-Yousef, H.M.
    Fouad, E.A.
    El-Hady Kandil, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/66085.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    detoxifying enzyme
    resistance
    cowpea aphid
    Aphis craccivora zob.cowpea aphid
    groundnut aphid zob.cowpea aphid
    black legume aphid
    true bug
    Aphididae
    synergism
    thiamethoxam
    insecticide
    Opis:
    The cowpea aphid (Aphis craccivora Koch) is considered a serious insect pest attacking several crops. We carried out biochemical studies to elucidate the role of the metabolising enzymes in conferring resistance to thiamethoxam, in two strains (resistant and susceptible) of the cowpea aphid. Bioassay experiments showed that the thiamethoxam selected strain developed a 48 fold resistance after consecutive selection with thiamethoxam for 12 generations. This resistant strain also exhibited cross-resistance to the tested carbamates; pirimicarb and carbosulfan, organophosphorus (malathion, fenitrothion, and chlorpyrifos-methyl), and the neonicotinoid (acetamiprid). Synergism studies have indicated that S,S,S-tributyl phosphorotrithioate (DEF), a known inhibitor for esterases, increased thiamethoxam toxicity 5.58 times in the resistant strain compared with the susceptible strain. Moreover, the biochemical determination revealed that carboxylestersae activity was 30 times greater in the resistant strain than in the susceptible strain. In addition, the enzyme activity of glutathione S-transferase (GST) and mixed function oxidases (mfo) increased only in the resistant strain 3.7 and 2.7 times, respectively, in relation to the susceptible (the control). Generally, our results suggest that the higher activity of the detoxifying enzymes, particularly carboxylesterase, in the resistant strain of the cowpea aphid, apparently have a significant role in endowing resistance to thiamethoxam, although additional mechanisms may contribute.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lookahead selective sampling for incomplete data
    Autorzy:
    Abdallah, L.
    Shimshoni, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/330278.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    selective sampling
    missing values
    ensemble clustering
    próbkowanie selektywne
    brakujące wartości
    grupowanie zespołowe
    Opis:
    Missing values in data are common in real world applications. There are several methods that deal with this problem. In this paper we present lookahead selective sampling (LSS) algorithms for datasets with missing values. We developed two versions of selective sampling. The first one integrates a distance function that can measure the similarity between pairs of incomplete points within the framework of the LSS algorithm. The second algorithm uses ensemble clustering in order to represent the data in a cluster matrix without missing values and then run the LSS algorithm based on the ensemble clustering instance space (LSS-EC). To construct the cluster matrix, we use the k-means and mean shift clustering algorithms especially modified to deal with incomplete datasets. We tested our algorithms on six standard numerical datasets from different fields. On these datasets we simulated missing values and compared the performance of the LSS and LSS-EC algorithms for incomplete data to two other basic methods. Our experiments show that the suggested selective sampling algorithms outperform the other methods.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2016, 26, 4; 871-884
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of TiAlV Films Prepared by Vacuum Arc Deposition: Effect of Substrate Temperature
    Autorzy:
    Abdallah, B.
    Mrad, O.
    Ismail, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400306.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    87.85.jf
    Opis:
    Three TiAlV films have been prepared by vacuum arc discharge technique at different substrate temperatures (50, 300, and 400°C). The depositions were carried out from aluminum, vanadium and titanium elemental targets. The temperature effects on the crystalline quality and texture have been investigated by means of X-ray diffraction. Two phases have been identified and the grain size has been found to increase with temperature. The composition of the films has been determined by proton induced X-ray emission technique. The Ti ratio was found to increase with temperature. The microhardness, measured by the Vickers indentation method was found to decrease with temperature. X-ray photoelectron spectroscopy was used to study the chemical composition of the passive layer formed on the films by analyzing high resolution spectra of Al 2p, Ti 2p and V 2p. This layer was mainly composed of $TiO_2$ with a small participation of other oxidation and metallic states of Ti, Al and V.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 76-79
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serological cross-sectional survey of equine infectious anemia in Saudi Arabia
    Autorzy:
    Kasem, S.
    Hashim, O.
    Alkarar, A.
    Hodhod, A.
    Elias, A.
    Abdallah, M.
    Al-Sahaf, A.
    Al-Doweriej, A.
    Qasim, I.
    Abdel-Moneim, A.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539306.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    equine infectious anaemia
    equine
    ELISA
    Saudi Arabia
    seroprevalence
    Opis:
    The equine infectious anaemia virus (EIAV) is one of the most serious equine diseases worldwide. There is scarce information on the epizootiology of equine infectious anaemia (EIA) in Saudi Arabia. Given the importance of the equine industry in Saudi Arabia, this cross- -sectional study aims to provide information about the prevalence of EIAV based on serological surveillance of the equine population in the country. A total of 4728 sera samples were collected (4523 horses and 205 donkeys) between December 2017 and November 2019. All samples were tested using commercially available EIAV ELISA. All tested samples showed negative results for EIAV antibodies with a 95% confidence interval. The results provided evidence that Saudi Arabia’s equine populations (horses and donkeys) are currently free of EIAV. The results also suggest the need for continuous monitoring of EIAV and strict regulation when importing horses from other countries.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 3; 365-368
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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