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2019
Abdelsalam, E., O. Hijazi, M. Samer, I. H. Yacoub, A. S. Ali, R. H. Ahmed, and H. Bernhardt, "Life cycle assessment of the use of laser radiation in biogas production from anaerobic digestion of manure", Renewable Energy, vol. 142, pp. 130-136, 2019. AbstractWebsite

Recent advancement was the use of laser radiation to photobiostimulate the methanogenic bacteria in order to increase the biogas and methane production from the anaerobic digestion (AD) of livestock manure. However, the environmental impact of using the laser radiation as anaerobic bacteria stimulator still not evaluated. The objective of this paper is to conduct a comparative environmental impact evaluation of manure treatment with different laser radiation times for biogas production. A life-cycle assessment (LCA) methodology was implemented for this purpose. The treatments under evaluation were 0.5 h, 1h and 2 h of laser irradiation compared to 1 h incandescent lighting and the control (neither laser irradiation nor light was used). The highest biogas yield, methane content and overall Energy were achieved with 0.5 h laser irradiation and were 335251 m3, 63.1% and 2043353 kWh, respectively. The results were presented in the form of the specific impacts on global warming and greenhouse gas (GHG) emissions mitigation of producing and utilizing biogas as an energy source. It was concluded that the photobiostimulation of anaerobic bacteria using laser irradiation has no negative environmental impact compared to the control, where no irradiation was applied.

2018
Ahmed, R. H., M. H. Badawi, A. S. Ali, and M. Fayez, "Growth performance of rhizobacteria on water hyacinth (Eichhornia crassipes) juices and dehydrated powder", The Egyptian Journal of Aquatic Research, vol. 44, no. 1, pp. 1 - 7, 2018. AbstractWebsite

In the present study, juice of water hyacinth (Eichhorina crassipes), either crude or from its successive dilutions (1:1, 1:10, 1:30, 1:50 v/v) supported the in vitro development of Bacillus megaterium, Bacillus subtilis, Azotobacter chroococcum and Rhizobium leguminosarum biovar Phaseoli with doubling time (23.1–63.0 min) which was comparable if not shorter, to that calculated using the standard laboratory -synthetic media (nutrient, N-deficient mannitol and yeast extract agar media; 48.0–64.8 min). Rhizospheric microorganisms of legume and non-legume plants successfully grew on surface-inoculated agar plates of crude and diluted juices of the macrophyte. Tea bags filled with the dehydrated powders (5 and 10 g l−1) of water hyacinth supported the in situ recoverability of total rhizobacteria in population densities (3 × 107 - >108 cfu.g−1), which were found to be comparable, if not excessive, to those enumerated on the recommended culture media. Morpho-physiological identification of some isolates that had developed on the plant juice and tea bag culture media, revealed that they are not akin to those cultured on the chemically-synthetic culture media; they possibly represent a portion of recommended media - unculturables.

2012
Ahmed, R. H., "Microalgae as a future key challenge to climate protection. (Poster and oral presentation)", 3rd International Conference for Prospective Leaders in Climate Protection and Resource Conservation on "Global Climate Change – Approaches to International Collaboration", Bonn, Germany, 2012.
2009
Ahmed, R. H., O. S. Barakat, and H. M. A., "Possible Toxicity of Drinking Water by Cyanotoxins in River Nile, Great Cairo", 1st International Joint Conference on Materials Science, Nanotechnology and Biotechnology- MNB 09- Future Challenges, National Research Centre (NRC). Giza, Egypt, 4-6 January 2009.
2008
Barakat, O. S., R. H. Ahmed, and H. M. A., "Biological and Chemical Evaluation of Some Drinking Water Sites on River Nile, Egypt", Bulletin of the Faculty of Agriculture of Cairo University, vol. 59, pp. 132-141, 2008.
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