A huge amount of textile dyes are released as industrial waste into the environment each year, wh... more A huge amount of textile dyes are released as industrial waste into the environment each year, which alters the water’s natural appearance and causes toxicity and carcinogenicity in the human body. Peanut husk is considered an agro-waste and contains many valuable compounds, such as cellulose. Different concentrations of cellulose were extracted from peanut husk and then loaded with bio-silver nanoparticles, which were fabricated using neem leaves (Azadirachta indica) as a reducing agent to form Ag-cellulose nanocomposites (Ag-Cell-NCMs). Different devices were used to characterize Ag-Cell-NCMs. The TEM images displayed that the size of Ag-Cell-NCMs ranged between 13.4 and 17.4 nm after dye adsorption. The Ag-Cell-NCMs were used to adsorb toxic dyes such as crystal violet (CV). Different parameters were applied, such as the ratio of cellulose to Ag-NPs, pH, contact time, adsorbent dose, dye concentration, and the temperature required to reach the optimization conditions to remove CV...
Nosocomial bacteria's ability to produce biofilms helps them survive in a variety of environm... more Nosocomial bacteria's ability to produce biofilms helps them survive in a variety of environments, such as hospitals, wounds, and medical devices. Cellulases can destroy cellulose, one of the major structural components of biofilms, representing an important part of the bacterial biofilm matrix. Bacterial strains were obtained from diabetic foot hospital patients and tested for their ability to produce biofilms in vitro. Isolates were identified as Staphylococcus aureus, Acinetobacter baumannii, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Escherichia coli using a standard set of biochemical assays commonly used at hospital laboratory. Biofilm degradation by CMCase enzyme was evaluated through in vitro tube method, microscopic observation and crystal violet assay. CMCase had a high effectiveness in eliminating P. aeruginosa biofilms and a modest capacity to remove biofilms of other strains used in this study. Light microscopy demonstrated fully disseminated cells of P. aeruginosa biofilm exposed to CMCase. Besides, Using CMCase dramatically eliminated 87.5% of the carbohydrate content of its biofilm matrix.
Microalgae are a diverse group of microorganisms, the majority of which are photosynthetic in nat... more Microalgae are a diverse group of microorganisms, the majority of which are photosynthetic in nature. Microalgae have different applications, the most important of which is the biological treatment of wastewater. Microalgae grow in various types of wastewater, such as wastewater polluted by Azo dyes, due to microalgae using wastewater as a culture medium, which contains many nutrients like nitrogen, phosphate, and carbon sources. Microalgae grow in various types of wastewater, such as wastewater polluted by Azo dyes, due to microalgae using wastewater as a culture medium, which contains many nutrients like nitrogen, phosphate, and carbon sources. So, microalgae are used for bioremediation of wastewater due to the efficiency of growing in wastewater and for the high production of lipids followed by trans-esterification to biodiesel. Face-centered central composite design (FCCCD) was used to determine the factors that have the most significant impact on the simultaneous decolorization...
A huge amount of textile dyes are released as industrial waste into the environment each year, wh... more A huge amount of textile dyes are released as industrial waste into the environment each year, which alters the water’s natural appearance and causes toxicity and carcinogenicity in the human body. Peanut husk is considered an agro-waste and contains many valuable compounds, such as cellulose. Different concentrations of cellulose were extracted from peanut husk and then loaded with bio-silver nanoparticles, which were fabricated using neem leaves (Azadirachta indica) as a reducing agent to form Ag-cellulose nanocomposites (Ag-Cell-NCMs). Different devices were used to characterize Ag-Cell-NCMs. The TEM images displayed that the size of Ag-Cell-NCMs ranged between 13.4 and 17.4 nm after dye adsorption. The Ag-Cell-NCMs were used to adsorb toxic dyes such as crystal violet (CV). Different parameters were applied, such as the ratio of cellulose to Ag-NPs, pH, contact time, adsorbent dose, dye concentration, and the temperature required to reach the optimization conditions to remove CV...
Nosocomial bacteria's ability to produce biofilms helps them survive in a variety of environm... more Nosocomial bacteria's ability to produce biofilms helps them survive in a variety of environments, such as hospitals, wounds, and medical devices. Cellulases can destroy cellulose, one of the major structural components of biofilms, representing an important part of the bacterial biofilm matrix. Bacterial strains were obtained from diabetic foot hospital patients and tested for their ability to produce biofilms in vitro. Isolates were identified as Staphylococcus aureus, Acinetobacter baumannii, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Escherichia coli using a standard set of biochemical assays commonly used at hospital laboratory. Biofilm degradation by CMCase enzyme was evaluated through in vitro tube method, microscopic observation and crystal violet assay. CMCase had a high effectiveness in eliminating P. aeruginosa biofilms and a modest capacity to remove biofilms of other strains used in this study. Light microscopy demonstrated fully disseminated cells of P. aeruginosa biofilm exposed to CMCase. Besides, Using CMCase dramatically eliminated 87.5% of the carbohydrate content of its biofilm matrix.
Microalgae are a diverse group of microorganisms, the majority of which are photosynthetic in nat... more Microalgae are a diverse group of microorganisms, the majority of which are photosynthetic in nature. Microalgae have different applications, the most important of which is the biological treatment of wastewater. Microalgae grow in various types of wastewater, such as wastewater polluted by Azo dyes, due to microalgae using wastewater as a culture medium, which contains many nutrients like nitrogen, phosphate, and carbon sources. Microalgae grow in various types of wastewater, such as wastewater polluted by Azo dyes, due to microalgae using wastewater as a culture medium, which contains many nutrients like nitrogen, phosphate, and carbon sources. So, microalgae are used for bioremediation of wastewater due to the efficiency of growing in wastewater and for the high production of lipids followed by trans-esterification to biodiesel. Face-centered central composite design (FCCCD) was used to determine the factors that have the most significant impact on the simultaneous decolorization...
Uploads
Papers by Ragaa Hamouda