فهرست مطالب مسعود مظفری

In this study, manganese oxide nanoparticles were synthesized by thermal decomposition process using organometallic compounds. Manganese acetylacetonate precursor was used for synthesis of MnO nanoparticles. The effect of oleic acid and oleylamine surfactants and dibenzyl ether and octadecene solvents on the size and morphology of the synthesized nanoparticles was studied. The effect of different heating rate of of 2 ◦C/min and 20 ◦C/min on the size and morphology of the synthesized nanoparticles was also investigated. X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analysis was used to evaluate the phase and morphology of the synthesized MnO nanoparticles. The results showed that the best conditions for achieving the smallest nanoparticles with uniform size and morphology was the heating rate of 20 °C/min, dibenzyl ether solvent and oleic acid surfactant. The results showed that the size of the MnO nano particles was about 10 to 20 nm with spherical morphology.

In this research diamond-like carbon (DLC) films were deposited on AISI316L stainless steel by plasma enhanced chemical vapor deposition (PECVD) method. In order to improve adhesion of the coating, plasma nitrocarbuizing method was performed on substrates before DLC deposition. Raman spectra of the coating showed that sp3 fraction of the film was 39%. Biological properties of the uncoated, plasma nitrocarburized and DLC coated samples were analyzed. MTT results showed that 316L stainless steel didn?t have appropriate biocompatibility and nitrocarburizing process and DLC deposition improved the biocompatibility of the samples due to preventing the release of toxic elements such as nickel. Cell viability of the uncoated, plasma nitrocarburized and DLC coated samples was about 29%, 40% and 71% respectively.

Medicinal plants are used in treating diseases as low-risk، available and inexpensive natural materials with higher consumption by people comparing to synthetic antimicrobial drugs. Excessive use of antimicrobial drugs led to medicinal resistance against different antibiotics in most bacteria. In this empirical experimental study، the antimicrobial effects of methanolic extracts of 14 medicinal plants species were examined comparing to conventional therapeutic antibiotics against standard bacterial strains. The plant species were collected from dashti of Bushehr province. The methanolic extract of the cultivations broths were prepared in different concentrations (0/25%، 0/5%، 1%، 2% and 4%) dissolved in DMSO/ Methanolic solution and their antibacterial potency respected on the inhibition zone using the disc diffusion assay. The maximum effects on Escherichia coli belonged to Arundo donax and the least effects belonged to Calotropis procera. The maximum effects on Staphylococcus aureus belonged to Lawsonia inermis and the least effects belonged to Calotropis procera. The maximum effects on Micrococcus luteus belonged to Phoeniex doctylifera and the least effects belonged to Oligomeris baccatus. The maximum effects on Klebsiella pneumonia belonged to mnocarpos decander and the least effects belonged Oligomeris baccatus. The maximum effects on pseudomonas aeroginosa belonged to Arundo donax. The maximum effects on Bacillus subtilis belonged to Astragalus arbusculinus. The antimicrobial effects of 4% methanolic extracts of Arundo donax were comparable to Cephalotin (30mcg)، Piperacilin (30mcg) and Amikacin (30mcg) against Escherichia coli and pseudomonas aeroginosa. The antimicrobial effects of %4 extracts of Lawsonia inermis were similar to Amikacin (30mcg) and Chloramphenicol (30mcg) against Klebsiella penumoniae.