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Papers by Ahmed El-Khatib

Egyptian Journal of Botany, 2020

Hoagland's solution to study its eco-physiological response to Cd and Ni toxicity. The plants wer... more Hoagland's solution to study its eco-physiological response to Cd and Ni toxicity. The plants were exposed to 10 or 25mg/L Cd or Ni over 7 days before harvesting for analysis. The findings of this study provided better understanding of stress adaptation in S. nigrum under Cd and Ni stress. The photosynthetic pigments and activities of antioxidant enzymes were estimated in the plant leaves. Chlorophyll content and carotenoids decreased progressively with increasing concentrations of both metals. Activities of the antioxidant enzymes POD, APX, CAT, and SOD in the leaves increased significantly by exposure to the high levels for both metals. The plant responses was varied with both metal and tested concentrations, reflecting the potentiality of using S. nigrum as phytoremediator of Cd and Ni polluted water in hydroponic culture system.

Studien Zur Altagyptischen Kultur, 2009

Journal of Environmental Studies, Dec 20, 2010

Three common tree species in the areas nearby Assiut Superphosphate Fertilizer Plant were selecte... more Three common tree species in the areas nearby Assiut Superphosphate Fertilizer Plant were selected to monitor the airborne particle pollutants along the physical year 2009-2010. The relative percentage value of the leaf deposit particles depends on the interaction between seasons, sites and tree species, where highly significant effects (P<0.001) were recorded in between. Morphological analysis by SEM of the leaf deposit confirms the presence of different particle species of PM2.5, PM10 and PM50. Quantitatively, PM2.5 dominated other particle types, reflecting the importance of the anthropogenic source, like Superphosphate Fertilizers Plant emission, in the air pollution status prevailing in the study area. The chemical analysis of the leaf particulate deposits exhibited a significant correlation with chemic indicator species to the fertilizers manufacture, where the particulate mass of the leaf deposit samples showed correlation with foliar Fe (r = 0.542), Cd (r = 0.528), Ca (0.805) and PO4 (r = 0.605), reflecting the possibility of using tree species as bio-monitors for the air particulate matter pollution.

The sixth season of fieldwork in the ancient necropolis of Asyut (Gebel Asyut al-gharbi) focused ... more The sixth season of fieldwork in the ancient necropolis of Asyut (Gebel Asyut al-gharbi) focused on L evel 7 including the forecourt of Tomb Nl 3.1, Tomb V, Tomb Nl 1.1, the Tomb of the Dogs, surveying Level 3 to 5 (from Tomb I up to Tomb HI) and the mapping of the necropolis. From 19 th August to 25 th September 2008 the Egyptian-German joint mission of Sohag University and the Johannes Gutenberg-Universitat Mainz conducted its sixth season of fieldwork 1 in the ancient necropolis of Asyut situated in the western mountains (Gebel Asyut al-gharbi). 2 In addition, the mission studied objects in the magazine at Shutb from 19 th August to 25 th September 2008. 3 Fieldwork focused on Level 7 including the forecourt of Tomb N13.1, Tomb V, Tomb N11.1, the Tomb of the Dogs, surveying L evel 3 to 5 (from Tomb I up to Tomb III) and the mapping of the necropolis. Mapping of the necropolis (Fig. 1) continued surveying the middle part of Gebel Asyut algharbi. The survey helped clarify the position of a dogs' tomb which was mentioned by early travelers (cf. below). In addition, a small concentration of cat bones on Level 5 was observed. Work also continued in Tomb V. While carrying away more than four metres of standing debris, small parts of wall decoration were detected. Tomb Nl 1.1 was partly cleaned for use as a magazine for the mission's equipment after closing the gebel. Tomb Nl 1.1 consists of a row of three pillars and five shafts as well as an unfinished shaft. Based on a naming mistake by H. W. Muller, this undecorated tomb was erroneously named Tomb of Iti-ibi in Egyptology. 4 ' During the fieldwork we received full cooperation and encouragement from the Supreme Council of Antiquities.

Journal of Environmental Studies, 2012

Comparisons were made between the anatomical and morphological changes in olive tree leaves from ... more Comparisons were made between the anatomical and morphological changes in olive tree leaves from a site with relatively clean air (Al-Khadra area), and two sites (al-Khums and Zelatin) near to cement factories in the area east to Tripoli, Libya. Olive tree leaves exhibited marked variations in their morphological and anatomical characteristics, in relations to variations in the site cement dust air pollution load. Under high pollution load, leaf visible injuries were recorded. In addition, stomata appeared in higher density and smaller size than those of control. The anatomical characteristics of olive leaf including cuticle, epidermis, palisade tissue, mesophyll tissue, and elements of vascular cylinder (xylem and phloem) reflected the deteriorate effects of cement dust air pollutants, the subject which recommend their using as bio indicators.

magnetic monitoring air pollution urban trees

DESALINATION AND WATER TREATMENT, 2017

The ability of aquatic macrophytes to bioaccumulate toxic metals relative to the concentrations o... more The ability of aquatic macrophytes to bioaccumulate toxic metals relative to the concentrations of these metals in wastewater has led to their use as phytoremediators. Lead (Pb) is among the most serious environmental contaminants. This study assesses the gibbous duckweed (Lemna gibba L.) as a bioaccumulator and bioindicator of Pb pollution. The plant recovery from a 12-d exposure period in terms of re-releases of Pb from its tissues, and recovery of pigmentation was monitored. Duckweed was exposed to Pb-contaminated water by adding PbCO 3 at concentrations from 10 to 100 mg/L. At 2-d intervals, bioaccumulation, contaminant removal efficiency, pigment content, and bleaching were assessed. The efficiency of Pb removal after 12 d reached nearly 50% at the lowest Pb treatment (10 mg/L), but decreased at higher levels of Pb up to 100 mg/L. The highest bioconcentration factors (BCF) were achieved at low Pb treatment of 10 mg/L, which increased from nearly 200 mg/L after 2 d, to 943 mg/L after 12 d of exposure. Recovery from bleaching was around 50% for all photosynthetic pigments in plants exposed to 10-40 mg/L concentrations of Pb. The response of duckweed to Pb treatment and recovery from stress suggest its possible use as biosensor or biomonitor of Pb pollution, considering that active uptake, rather than low concentration gradient, is driving the absorption of Pb from the water medium.

International Journal of Phytoremediation, 2013

In view of their potential bioaccumulation of heavy metals, Ceratophyllum demersum and Myriophyll... more In view of their potential bioaccumulation of heavy metals, Ceratophyllum demersum and Myriophyllum spicatum was studied under hydroponic cultures enriched by different Pb concentrations (25, 50, 75 mg/l) for 1-7 days. Both species exerted remarkable capabilities to concentrate Pb in their tissues as compared to control. The highest accumulation value of Pb (164.26 mg/g x dw) was recorded in C. demersum and the most of metal (91.72 mg/g dw) accumulated after 1 d. Significant reduction in photosynthetic pigments and appearance of morphological symptoms such as chlorosis and fragmentation of leaves were evident after 7d at 75 mg/l. The activity of POX and APX, carotenoids and proline showed induction at lower concentration and duration followed by decline. Major re-shuffle in protein patterns appeared as a tolerant mechanism, which both species developed under Pb toxicity. Results suggest that both species responded positively to Pb concentration and accumulated high amount of metal. Due to metal accumulation coupled with detoxification potential, both species appear to have potential for use as phytoremediators and the developed responses can be used as reliable biomarkers for Pb water pollution.

atmospheric pollution biomonitoring anatomy

Acta Agronomica Hungarica

ABSTRACT

... 【Key Words】： tulip bulb low ... 2, WANG Peng,LIAN Yong,JIN Liping(Institute of Vegetables a... more ... 【Key Words】： tulip bulb low ... 2, WANG Peng,LIAN Yong,JIN Liping(Institute of Vegetables and Flowers,Chinese Academy of Agricultural Sciences,Beijing100081,China);The Research on the Regulation of Enzymes During Dormancy and Dormancy Releasing[J];Acta ...

The physiological response of Eucalyptus rostrata due to exposure to heavy metal air pollutants w... more The physiological response of Eucalyptus rostrata due to exposure to heavy metal air pollutants was investigated. The heavy metals Cu, Cd, Fe, and Pb were applied to the above ground parts of the plants, under greenhouse conditions. The metal contents were proportional to the metal concentration in the sprayed solutions. Increasing sprayed metal concentrations was found to have an important effect to develop phytotoxicity signs with Cu, Cd and Pb. With the metal concentration increment, a sharp increase in the specific leaf area (P<0.05) from control was detected. The dry mass and leaf water content showed narrow variations among the different concentrations of the same metal and metal species varied significantly in their effects. The metal-pigment analysis showed a significant pigment reduction (P<0.01) with increasing metal concentration in the sprayed solution.

ABSTRACT allelopathy cleome xerophytes