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Antimicrobial and Catalytic Activities of Green Synthesized Silver Nanoparticles Using Bay Laurel (<i>Laurus nobilis</i>) Leaves Extract 被引量:1
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作者 abdulaziz yahya al-ghamdi 《Journal of Biomaterials and Nanobiotechnology》 2019年第1期26-39,共14页
In this study, bay laurel extract (BLE) used as a reducing and capping agent for the synthesis of silver nanoparticles (AgNPs). The green-prepared AgNPs investigated using UV-visible spectroscopy, Fourier-transform in... In this study, bay laurel extract (BLE) used as a reducing and capping agent for the synthesis of silver nanoparticles (AgNPs). The green-prepared AgNPs investigated using UV-visible spectroscopy, Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX) and Transmission electron microscopy (TEM). Formation of AgNPs monitored at ambient temperature by a change in color from the starting solution to dark brown. Green synthesis AgNps were investigated for antimicrobial activity. The microorganisms employed were E. coli, K. pneumoniae, B. cereus, S. aureus, C. lbicans and Aspergillus. The susceptibility of microorganisms against the six AgNPs solutions was determined using the disk diffusion method. The catalytic activity of the prepared AgNPs (sample, d) for basic brown 1 dye was investigated. The results showed the characteristic surface plasmon resonance peak of the AgNPs appeared at approximately 415 - 440 nm. XRD revealed peaks at 38.2, 44.16, 64.24 and 77.22 &#415;, and the intensity of these peaks enhanced when using microwave curing compared to ambient temperature. SEM and TEM results showed that the silver nano particles have a spherical shape and the particle size for samples is less than 34 nm. FTIR spectroscopy measurements showed the binding of organic compounds on the surface of the silver nanoparticles. Highest antibacterial activity was enhanced with increasing of AgNPs dose and with increasing of extract ration against most of microorganisms except. Removal of basic brown 1 dye by the prepared AgNPs indicated complete dye removal after 8 h. 展开更多
关键词 Green Synthesis AGNPS Removal Basic BROWN 1 Biological Activity
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Antibacterial Activity of Green Synthesis Silver Nanoparticles Using Some Wild Edible Plants Commonly Used in Al Baha, Saudi Arabia
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作者 abdulaziz yahya al-ghamdi 《Advances in Microbiology》 2018年第12期938-949,共12页
In the present study, aqueous extract of Cissus rotundifolia (Wild edible plants) was used as a reducing and capping agent in the formation of silver nanoparticles (AgNPs). UV-visible spectroscopy (Uv-Vis) was used to... In the present study, aqueous extract of Cissus rotundifolia (Wild edible plants) was used as a reducing and capping agent in the formation of silver nanoparticles (AgNPs). UV-visible spectroscopy (Uv-Vis) was used to monitor the formation of AgNPs in the aqueous medium. The green-prepared AgNPs investigated using Fourier-transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). The morphology and size of the benign silver nanoparticles were carried out by the transmission electron microscope (TEM) and field emission scanning electron microscope (FE-SEM). The susceptibility of bacteria strains against the green synthesis AgNPs was determined using the disk diffusion method. The microorganisms employed were E. coli, K. pneumoniae, B. cereus, S. aureus, C. lbicans and Aspergillus. The results showed the characteristic surface plasmon resonance peak of the AgNPs appeared at approximately 418 - 446 nm. XRD revealed peaks at 38.2, 44.16, 64.24 and 77.22 θ, and the intensity of these peaks enhanced when using microwave curing compared to ambient temperature. SEM and TEM results showed that the silver nanoparticles have a spherical shape and the particle size for samples is less than 37 nm. FTIR spectroscopy measurements showed the binding of organic compounds on the surface of the silver nanoparticles. The highest antibacterial activity was enhanced with increasing of AgNPs dose and with increasing of extract ration against most of microorganisms. 展开更多
关键词 Green Synthesis AGNPS FTIR XRD SEM-EDX & TEM Biological Activity
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Soil Microbial Biomass of Pea (<i>Pisium sativum</i>cv. Little Marvel) in Response to Three Atmospheric Air Regimes at Al Baha Region, KSA
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作者 abdulaziz yahya al-ghamdi 《American Journal of Climate Change》 2017年第4期607-621,共15页
This study was conducted to determine the effect of atmospheric air on soil health in pots involving the growth of pea under two soil moisture regimes. Twelve pots were treated with three air quality treatments of urb... This study was conducted to determine the effect of atmospheric air on soil health in pots involving the growth of pea under two soil moisture regimes. Twelve pots were treated with three air quality treatments of urban, suburban and rural sites. In situ soil respiration increased under urban and suburban while it decreased little under rural site atmospheric conditions. These data support the relationships between the number of microorganisms in soils and carbon dioxide fluxes. Microbial biomass, metabolic quotient and crop yields or biomass were found most sensitive indicators of soil quality, which significantly varied in response to air quality and soil moisture regimes. The soil microbial biomass, metabolic quotient, and basal respiration were the most practical quality index variables;however, when using only a single predicator, microbial biomass was the most sensitive indicator of the soil quality. 展开更多
关键词 Microbial Biomass Atmospheric Sites PEA CULTIVARS Moisture Regimes
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