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  • Author or Editor: M. Sakr x
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Two field experiments were carried out to investigate the role of seed soaking with spermine (Spm, 10 mg/l) and the foliar application of mineral nutrients (K and Zn), alone or in combination, in improving the tolerance of sunflower ( Helianthus annuus L.) to calcareous and salinity stress conditions. Both the individual treatments and the interaction increased the stem diameter, shoot fresh and dry weights, yield, yield components and oil yield, as well as the concentrations of K, Ca, P and Zn and the K/Na ratio, whereas they decreased the Na concentration in the two growing seasons. The best results were obtained with the K+Zn+Spm treatment in both seasons.It could be concluded that seed soaking with Spm and the foliar application of K and Zn might alleviate the harmful effects of calcareous and salinity stress and enhance the ability of sunflower plants to tolerate these adverse conditions.

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Abstract  

Portland cement was mixed with kaolinite clay and epoxy polymer at different ratios to immobilize radioactive waste ions. The physical and mechanical properties of the mixtures in presence and in absence of some chemicals were investigated. Thermal analysis and infrared spectra of each mixture were also determined. The release of radioactive ions from cement, kaolinite clay, polymer mixture was studied. The presence of 7.5% kaolinite and 6% epoxy polymer increased the mechanical strength of cement mixed by 40% water, and decreased leachability of ions from mixture. Studies were also performed on a mixture of cement and 7.5% kaolinite cubes coated with a layer of epoxy polymer. Leachability of ions from these samples was decreased. A proposed container was designed to prevent release of ions from the immobilized matrix to the environment.

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Abstract  

Meropenem was successfully radiolabeled with 99mTc in high labeling yield (92 ± 2%) and stability (~6 h). 99mTc–meropenem showed high accumulation in tumor hypoxic tissue (4.193% injected dose/g organ). 99mTc–meropenem showed high ability to differentiate the tumor tissue from inflamed or infected tissues in different mice models as its T/NT ratio ~4 in case of tumor mice model while T/NT ratio ~1 in case of inflamed mice model. So, 99mTc–meropenem showed high selectivity in comparison with FDG-PET and 99mTc-nitroimidazole analogues. Thus, 99mTc–meropenem could be used as a selective potential imaging agent for diagnosis of tumor hypoxia.

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Gastric ulcer is a common gastrointestinal disease. One suggested mechanism is increased oxidative stress. Puplished data showed that dehydroepiandrosterone (DHEA) may limit oxidative stress and lipid peroxidation.

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