Dentists, as well as other dental personnel are constantly exposed to a number of specific occupa... more Dentists, as well as other dental personnel are constantly exposed to a number of specific occupational hazards. These cause the appearance of various ailments, specific to the profession, which develop and intensify with years. Despite numerous technical advances in recent years, many occupational health problems still persist in modern dentistry. These include percutaneous exposure incidents (PEI), exposure to infectious diseases, radiation, dental materials, musculoskeletal disorders (MSD), dermatitis, respiratory disorders, eye injuries and psychological problems. PEI remains a particular concern, as there is an almost constant risk of exposure to serious infectious agents. Aside from biological hazards, dentists continue to suffer a high prevalence of MSD, especially of the back, neck and shoulders. Awareness regarding these occupational hazards and implementation of preventive strategies can provide a safe working environment for all the dental personnel. There is also a need ...
ABSTRACT This paper deals with the synthesis and the characterization of reverse osmosis membrane... more ABSTRACT This paper deals with the synthesis and the characterization of reverse osmosis membranes reached by barium titanium oxide nanoparticles. A composite membrane containing BaTiO3 nanoparticles (NPs) was prepared by the in situ interfacial polymerization (IP) process on porous polysulfone supports. Aqueous m-phenyl diamine (MPD) and organic trimesoyl chloride (TMC)-NPs mixture solutions were used in the IP process. BaTiO3 NPs with a size between 100-200 nm were used as the fillers to fabricate nanocomposite membranes at concentrations ranging from 0.001% to 0.01% wt%. The membranes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscope (AFM) and contact angle technique. Their performances were evaluated based on the water permeability and salt rejection. Results indicated that the BaTiO3 nanoparticles are well dispersed in polyamide (PA) layer and improved membrane performance under optimal concentrations. By changing the content of filler, hydrophilicity and roughness of the composite membranes were increased. Notably, the permeate water flux increased from 26 to 42 L/m2h at BaTiO3 concentration of 0.009% with the maintaining of Sodium chloride (NaCl) high salt rejection of 98%. These results were obtained with initial NaCl concentration of 2000 ppm and under pressure of 225 psi. For the hydrophilicity, the contact angle was decreased from 73° to 24°.
Philosophical transactions of the Royal Society of London. Series B, Biological sciences, Jan 5, 2016
Although modern techniques such as two-photon microscopy can now provide cellular-level three-dim... more Although modern techniques such as two-photon microscopy can now provide cellular-level three-dimensional imaging of the intact living brain, the speed and fields of view of these techniques remain limited. Conversely, two-dimensional wide-field optical mapping (WFOM), a simpler technique that uses a camera to observe large areas of the exposed cortex under visible light, can detect changes in both neural activity and haemodynamics at very high speeds. Although WFOM may not provide single-neuron or capillary-level resolution, it is an attractive and accessible approach to imaging large areas of the brain in awake, behaving mammals at speeds fast enough to observe widespread neural firing events, as well as their dynamic coupling to haemodynamics. Although such wide-field optical imaging techniques have a long history, the advent of genetically encoded fluorophores that can report neural activity with high sensitivity, as well as modern technologies such as light emitting diodes and ...
Polyacrylic acid (PAA) is an important industrial chemical, which has been extensively applied in... more Polyacrylic acid (PAA) is an important industrial chemical, which has been extensively applied in various fields, including for several biomedical purposes. In this study, we report the synthesis and modification of this polymer with various phenol imides, such as succinimide, phthalimide and 1,8-naphthalimide. The as-synthesized derivatives were used to prepare polymer metal composites by the reaction with Zn(+2). These composites were characterized by using various techniques, including NMR, FT-IR, TGA, SEM and DSC. The as-prepared PAA-based composites were further evaluated for their anti-microbial properties against various pathogens, which include both Gram-positive and Gram-negative bacteria and different fungal strains. The synthesized composites have displayed considerable biocidal properties, ranging from mild to moderate activities against different strains tested.
The objective of this work was to prepare and characterize a new and highly efficient modified me... more The objective of this work was to prepare and characterize a new and highly efficient modified membrane by in situ interfacial polymerization on porous polysulfone supports. The process used m-phenylenediamine and trimesoyl chloride in hexane, incorporating silver oxide Ag 2 O nanoparticles of varied concentrations from 0.001 to 0.1 wt%. Ag 2 O nanoparticles were prepared at different sizes varying between 20 and 50 nm. The modified membranes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), transmission electron microscopy (TEM), and contact angle measurement. The results showed a smooth membrane surface and average surface roughness from 31 to 74 nm. Moreover, hydrophilicity improved and the contact angle decreased to 41° at 0.009 wt% silver oxide. The performances of the developed membranes were investigated by measuring permeate fluxes and salt rejection capability by passing NaCl solutions (2000 ppm) through the membranes at 225 psi. The results showed that the flux increased from 26 to 40.5 L/m 2 h, while the salt rejection was high, at 99 %, with 0.003 wt% Ag 2 O nanoparticles.
In this paper the preparation of 5-[(2-aminophenyl)imino]-3,3-dimethylcyclohexanone and 5-[(4-ami... more In this paper the preparation of 5-[(2-aminophenyl)imino]-3,3-dimethylcyclohexanone and 5-[(4-aminophenyl)imino]-3,3-dimethyl cyclohexanone in the ethanolic medium. The structures of these compounds were characterized by elemental analysis, FT-IR,1H-NMR and13C-NMR. The antibacterial and antifungal activity of these compounds has been investigated by agar disc diffusion method using Gram-negative and Gram-positive bacterial strain and four kinds of fungi.
The synthesis of 2,6-bis(hydroxy(phenyl)methyl)cyclohexanone 1 is described. The molecular struct... more The synthesis of 2,6-bis(hydroxy(phenyl)methyl)cyclohexanone 1 is described. The molecular structure of the title compound 1 was confirmed by NMR, FT-IR, MS, CHN microanalysis, and X-ray crystallography. The molecular structure was also investigated by a set of computational studies and found to be in good agreement with the experimental data obtained from the various spectrophotometric techniques. The antimicrobial activity and molecular docking of the synthesized compound was investigated.
Recently, green reduction of graphene oxide (GRO) using various natural materials, including plan... more Recently, green reduction of graphene oxide (GRO) using various natural materials, including plant extracts, has drawn significant attention among the scientific community. These methods are sustainable, low cost, and are more environmentally friendly than other standard methods of reduction. Herein, we report a facile and eco-friendly method for the bioreduction of GRO using Salvadora persica L. (S. persica L.) roots (miswak) extract as a bioreductant. The as-prepared highly reduced graphene oxide (SP-HRG) was characterized using powder X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron (XPS) spectroscopy, and transmission electron microscopy (TEM). Various results have confirmed that the biomolecules present in the root extract of miswak not only act as a bioreductant but also functionalize the surface of SP-HRG by acting as a capping ligand to stabilize it in water and other ...
An efficient and selective method was developed for the first time with 10% Ni/SiO2 catalytic sys... more An efficient and selective method was developed for the first time with 10% Ni/SiO2 catalytic system for acylation of benzyl alcohol to benzyl acetate with 98% conversion using acetonitrile solvent under reflux with acetic anhydride. In this method, we used aromatic alcohols like 4-chlorobenzyl alcohol and 4-nitrobenzyl alcohol, respectively. Ni species formed on silica surface demonstrates that Ni silica catalyst is active, while the calcined 2%, 5% and10% Ni/SiO2 were less active compared with uncalcined 2%, 5% and 10% Ni/SiO2 catalysts, which were active for the title reaction. 10% Ni/SiO2 catalysts were characterized by XRD, IR, BET, SEM, and UVDRS analyses. The catalysts showed remarkable reusability of 3 cycles, there is no leaching of catalysts, and finally blank reaction was also tested. The method of acylation is superactive, economic, and environmentally benevolent.
Dentists, as well as other dental personnel are constantly exposed to a number of specific occupa... more Dentists, as well as other dental personnel are constantly exposed to a number of specific occupational hazards. These cause the appearance of various ailments, specific to the profession, which develop and intensify with years. Despite numerous technical advances in recent years, many occupational health problems still persist in modern dentistry. These include percutaneous exposure incidents (PEI), exposure to infectious diseases, radiation, dental materials, musculoskeletal disorders (MSD), dermatitis, respiratory disorders, eye injuries and psychological problems. PEI remains a particular concern, as there is an almost constant risk of exposure to serious infectious agents. Aside from biological hazards, dentists continue to suffer a high prevalence of MSD, especially of the back, neck and shoulders. Awareness regarding these occupational hazards and implementation of preventive strategies can provide a safe working environment for all the dental personnel. There is also a need ...
ABSTRACT This paper deals with the synthesis and the characterization of reverse osmosis membrane... more ABSTRACT This paper deals with the synthesis and the characterization of reverse osmosis membranes reached by barium titanium oxide nanoparticles. A composite membrane containing BaTiO3 nanoparticles (NPs) was prepared by the in situ interfacial polymerization (IP) process on porous polysulfone supports. Aqueous m-phenyl diamine (MPD) and organic trimesoyl chloride (TMC)-NPs mixture solutions were used in the IP process. BaTiO3 NPs with a size between 100-200 nm were used as the fillers to fabricate nanocomposite membranes at concentrations ranging from 0.001% to 0.01% wt%. The membranes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscope (AFM) and contact angle technique. Their performances were evaluated based on the water permeability and salt rejection. Results indicated that the BaTiO3 nanoparticles are well dispersed in polyamide (PA) layer and improved membrane performance under optimal concentrations. By changing the content of filler, hydrophilicity and roughness of the composite membranes were increased. Notably, the permeate water flux increased from 26 to 42 L/m2h at BaTiO3 concentration of 0.009% with the maintaining of Sodium chloride (NaCl) high salt rejection of 98%. These results were obtained with initial NaCl concentration of 2000 ppm and under pressure of 225 psi. For the hydrophilicity, the contact angle was decreased from 73° to 24°.
Philosophical transactions of the Royal Society of London. Series B, Biological sciences, Jan 5, 2016
Although modern techniques such as two-photon microscopy can now provide cellular-level three-dim... more Although modern techniques such as two-photon microscopy can now provide cellular-level three-dimensional imaging of the intact living brain, the speed and fields of view of these techniques remain limited. Conversely, two-dimensional wide-field optical mapping (WFOM), a simpler technique that uses a camera to observe large areas of the exposed cortex under visible light, can detect changes in both neural activity and haemodynamics at very high speeds. Although WFOM may not provide single-neuron or capillary-level resolution, it is an attractive and accessible approach to imaging large areas of the brain in awake, behaving mammals at speeds fast enough to observe widespread neural firing events, as well as their dynamic coupling to haemodynamics. Although such wide-field optical imaging techniques have a long history, the advent of genetically encoded fluorophores that can report neural activity with high sensitivity, as well as modern technologies such as light emitting diodes and ...
Polyacrylic acid (PAA) is an important industrial chemical, which has been extensively applied in... more Polyacrylic acid (PAA) is an important industrial chemical, which has been extensively applied in various fields, including for several biomedical purposes. In this study, we report the synthesis and modification of this polymer with various phenol imides, such as succinimide, phthalimide and 1,8-naphthalimide. The as-synthesized derivatives were used to prepare polymer metal composites by the reaction with Zn(+2). These composites were characterized by using various techniques, including NMR, FT-IR, TGA, SEM and DSC. The as-prepared PAA-based composites were further evaluated for their anti-microbial properties against various pathogens, which include both Gram-positive and Gram-negative bacteria and different fungal strains. The synthesized composites have displayed considerable biocidal properties, ranging from mild to moderate activities against different strains tested.
The objective of this work was to prepare and characterize a new and highly efficient modified me... more The objective of this work was to prepare and characterize a new and highly efficient modified membrane by in situ interfacial polymerization on porous polysulfone supports. The process used m-phenylenediamine and trimesoyl chloride in hexane, incorporating silver oxide Ag 2 O nanoparticles of varied concentrations from 0.001 to 0.1 wt%. Ag 2 O nanoparticles were prepared at different sizes varying between 20 and 50 nm. The modified membranes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), transmission electron microscopy (TEM), and contact angle measurement. The results showed a smooth membrane surface and average surface roughness from 31 to 74 nm. Moreover, hydrophilicity improved and the contact angle decreased to 41° at 0.009 wt% silver oxide. The performances of the developed membranes were investigated by measuring permeate fluxes and salt rejection capability by passing NaCl solutions (2000 ppm) through the membranes at 225 psi. The results showed that the flux increased from 26 to 40.5 L/m 2 h, while the salt rejection was high, at 99 %, with 0.003 wt% Ag 2 O nanoparticles.
In this paper the preparation of 5-[(2-aminophenyl)imino]-3,3-dimethylcyclohexanone and 5-[(4-ami... more In this paper the preparation of 5-[(2-aminophenyl)imino]-3,3-dimethylcyclohexanone and 5-[(4-aminophenyl)imino]-3,3-dimethyl cyclohexanone in the ethanolic medium. The structures of these compounds were characterized by elemental analysis, FT-IR,1H-NMR and13C-NMR. The antibacterial and antifungal activity of these compounds has been investigated by agar disc diffusion method using Gram-negative and Gram-positive bacterial strain and four kinds of fungi.
The synthesis of 2,6-bis(hydroxy(phenyl)methyl)cyclohexanone 1 is described. The molecular struct... more The synthesis of 2,6-bis(hydroxy(phenyl)methyl)cyclohexanone 1 is described. The molecular structure of the title compound 1 was confirmed by NMR, FT-IR, MS, CHN microanalysis, and X-ray crystallography. The molecular structure was also investigated by a set of computational studies and found to be in good agreement with the experimental data obtained from the various spectrophotometric techniques. The antimicrobial activity and molecular docking of the synthesized compound was investigated.
Recently, green reduction of graphene oxide (GRO) using various natural materials, including plan... more Recently, green reduction of graphene oxide (GRO) using various natural materials, including plant extracts, has drawn significant attention among the scientific community. These methods are sustainable, low cost, and are more environmentally friendly than other standard methods of reduction. Herein, we report a facile and eco-friendly method for the bioreduction of GRO using Salvadora persica L. (S. persica L.) roots (miswak) extract as a bioreductant. The as-prepared highly reduced graphene oxide (SP-HRG) was characterized using powder X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron (XPS) spectroscopy, and transmission electron microscopy (TEM). Various results have confirmed that the biomolecules present in the root extract of miswak not only act as a bioreductant but also functionalize the surface of SP-HRG by acting as a capping ligand to stabilize it in water and other ...
An efficient and selective method was developed for the first time with 10% Ni/SiO2 catalytic sys... more An efficient and selective method was developed for the first time with 10% Ni/SiO2 catalytic system for acylation of benzyl alcohol to benzyl acetate with 98% conversion using acetonitrile solvent under reflux with acetic anhydride. In this method, we used aromatic alcohols like 4-chlorobenzyl alcohol and 4-nitrobenzyl alcohol, respectively. Ni species formed on silica surface demonstrates that Ni silica catalyst is active, while the calcined 2%, 5% and10% Ni/SiO2 were less active compared with uncalcined 2%, 5% and 10% Ni/SiO2 catalysts, which were active for the title reaction. 10% Ni/SiO2 catalysts were characterized by XRD, IR, BET, SEM, and UVDRS analyses. The catalysts showed remarkable reusability of 3 cycles, there is no leaching of catalysts, and finally blank reaction was also tested. The method of acylation is superactive, economic, and environmentally benevolent.
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Papers by Mohammed Shaik