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277 results on '"Hassan, Enas"'

12. Lossless EEG Data Compression Using Delta Modulation and Two Types of Enhanced Adaptive Shift Coders

Author

Hadi, Hend A., George, Loay E., Hassan, Enas Kh., Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Al-Bakry, Abbas M., editor, Al-Mamory, Safaa O., editor, Sahib, Mouayad A., editor, George, Loay E., editor, Aldhaibani, Jaafar A., editor, Hasan, Haitham S., editor, and Oreku, George S., editor

Published
2021
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18. Phosphoric Acid Pretreatment and Saccharification of Paper Sludge as a Renewable Material for Cellulosic Fibers.

Author

El-Mekkawi, Samar, Abou-Elseoud, Wafaa, Fadel, Shaimaa, Hassan, Enas, and Hassan, Mohammad

Subjects
PAPER recycling, RESPONSE surfaces (Statistics), ACETIC acid, LACTIC acid, PHOSPHORIC acid, FURFURAL
Abstract

Recycling of paper sludge waste is crucial for establishing a sustainable green industry. This waste contains valuable sugars that can be converted into important chemicals such as ethanol, poly hydroxybutyrate, and lactic acid. However, the main challenge in obtaining sugars in high yield from paper sludge is the high crystallinity of cellulose, which hinders hydrolysis. To address this, pretreatment using phosphoric acid was optimized using response surface methodology to facilitate cellulose hydrolysis with minimal energy and chemicals. The created prediction model using the response surface method considered factors such as acid concentration (ranging from 60% to 85%), consistency (ranging from 4% to 10%), temperature (ranging from 25°C to 80°C), and time (ranging from 0.5 to 4 h). The results revealed that the model's significant factors affecting the yield were acid concentration, reaction time, temperature, and the product of acid concentration and temperature, while the model's significant factors affecting the crystallinity were the consistency, the temperature, and their product. The results showed that the optimum conditions for pretreatment were using an acid concentration of 64%, temperature of 25°C, consistency of 10%, and time of 30 min. The hydrolysis of the conditionally pretreated paper sludge resulted in a weight loss of 42%, compared to only 18% weight loss in non-pretreated paper sludge. Furthermore, the optimized conditions led to low levels of furfurals and acetic acid, which are undesirable by-products that can interfere with sugar fermentation. The total sugar obtained under the optimized conditions was 0.43 g glucose/g sample (10.46 g/L), while the contents of methyl furfural, furfural, and acetic acid were 21.65, 235.7, and 4.57 mg/L, respectively. This study demonstrates the potential of phosphoric acid for pretreatment and hydrolysis of paper sludge, enabling efficient saccharification and the production of sugars with minimal undesired by-products. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Development of amine functional hydrogels for corneal regeneration

Author

Hassan, Enas, MacNeil, Sheila, and Rimmer, Stephen

Subjects
620
Abstract

The aim of this thesis was to develop a synthetic polymethacrylate based hydrogel capable of regenerating a corneal epithelium for the purposes of treating blindness caused by limbal stem cell deficiency. Deficiency of limbal epithelial cells (LECs) causes conjunctival epithelial cells to move over the cornea, resulting in painful scaring, vascularisation and corneal opacity. Unilateral defects can be treated using LEC cultured from the unaffected eye, transplanting them to the affected cornea after scar tissue is removed. The underlying wound bed is often damaged, however, hence the need to develop a corneal inlay to aid in corneal re-epithelialisation, while replacing damaged stromal tissue. Transparent epoxy-functional polymethacrylate networks were synthesised using a combination of glycerol monomethacrylate, ethylene glycol dimethacrylate, lauryl methacrylate and glycidyl methacrylate that produced different bulk hydrogel compositions or “Bases” with different equilibrium water contents (EWC) (Base 0, 1 and 2) and different quantities of epoxy functionality (Bases 1.B, 1.15, 1.20 and 1.30). Sets of amine-functional hydrogels were produced following reaction of the epoxide groups with excesses of ammonia, 1,2-diamino ethane, 1,3-diamino propane, 1,4-diamino butane or 1,6- diamino hexane. The gels were assessed for their capacity to support the growth and proliferation for both rabbit limbal fibroblasts (rLFs) and rabbit limbal epithelial cells (rLECs). Overall no series of hydrogels supported the proliferation of rLFs irrespective of amine functionalisation, however gels functionalised with longer alkyl amines supported the adhesion and proliferation of rLECs, particularly when functionalised with 1,4-diamino butane. With Base 1 hydrogels (less so with Bases 0 and 2) a vigorous epithelial outgrowth was seen from small limbal explants and a confluent epithelial layer was achieved in vitro within 6 days. The data in this thesis support the development of hydrogels capable of selectively regenerating corneal epithelium with minimal stromal cell contamination.

Published
2014

42. Additional file 1 of Optimizing the synthesis of yeast Beta-glucan via response surface methodology for nanotechnology application

Author

Atta-Allah, Alshimaa A., Ahmed, Rania F., Shahin, Azza A. M., Hassan, Enas A., El-Bialy, Heba Abd-Alla, and El-Fouly, Mohie Z.

Abstract

Additional file 1: Figure (S1). Plot of significance effects and Pareto chart of the variables influencing β-glucan biosynthesis by Kluyveromyces lactis. Figure (S2). Plot of significance effects and Pareto chart of the variables influencing β-glucan biosynthesis by Meyerozyma guilliermondii. Figure (S3). Response optimization plots of the most significant variables affecting β-glucan biosynthesis. A: Minerals and vitamins concentration for Kluyveromyces lactis. B: Nitrogen and Phosphate concentrations for Meyerozyma guilliermondii. Figure S4. Phylogenetic tree showing the relationship of the selected yeast Kluyveromyces lactiswith other related fungal species relatives from Genbank based on their sequence homology of 18S rRNA. Figure S5. Phylogenetic tree showing the relationship of the selected yeast Meyerozyma guilliermondii with other related fungal species relatives from Genbank based on their sequence homology of 18S rRNA.

Published
2023
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