TL;DR: The in vitro antibacterial activity of the essential oils was studied against 12 bacteria strains using disc diffusion and broth microdilution methods and exhibited strong zone of inhibitions against some bacteria such as S. faecalis and S. macrcescens.
Abstract: The chemical composition and the antibacterial activity of the essential oils obtained by hydrodistillation from the leaves of Callistemon citrinus and Callistemon viminalis were analyzed by GC and GC/MS. Twenty-four and twelve components were identified for C. citrinus and C. viminalis, representing 92.0% and 98.3% of the total oils. The major components of C. citrinus and C. viminalis were 1,8-cineole (61.2% and 83.2%) and α-pinene (13.4% and 6.4%), respectively. The in vitro antibacterial activity of the essential oils was studied against 12 bacteria strains using disc diffusion and broth microdilution methods. The oils exhibited strong zone of inhibitions against some bacteria such as S. faecalis (20.3-24.0 mm), both strains of S. aureus (23.0-26.3 mm), B. cereus (17.3-19.0 mm) and S. macrcesens (11.3-23.7 mm) when compared to standard antibiotics gentamycin and tetracycline used as controls. Expect for P. aeruginosa and S. macrcescens, the MIC values of both essential oils ranged from 0.31-2.50 mg/mL.
TL;DR: In this paper, the main physical properties of single-phase pure α-Cr2O3 nanoparticles synthesized by a facile, rapid and eco-friendly process using Callistemon viminalis extract as an effective oxidizing/reducing agent were reported.
Abstract: This contribution reports for the first time on the synthesis and the main physical properties of single-phase pure α-Cr2O3 nanoparticles synthesized by a facile, rapid and eco-friendly process using Callistemon viminalis flower's extract as an effective oxidizing/reducing agent. These crystalline nanoparticles exhibit a cubic-like platelet shape with sharp edges with an average particle diagonal size of ∼92.2 nm. The room temperature physical properties of these pure highly crystalline Eskolaite α-Cr2O3 nanoparticles were carried out using complementary techniques such as high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), XRD, FTIR-ATR, Raman and XPS.
TL;DR: In this paper, the authors demonstrated the possibility of synthesizing Sm2O3 nano-scaled particles as small as 21.9 ± 5nm using an entirely new green process.
TL;DR: The results indicate that the biogenic and magnetic Fe2O3 can be used for diverse biomedical applications.
Abstract: Aqueous floral extracts of Callistemon viminalis were used to synthesize Fe2O3 nanoparticles (IONPs) which were intensively characterized through UV–vis, X-ray diffraction, HR-SEM/HR-TEM, Fourier- ...
TL;DR: Onebert et al. as mentioned in this paper proposed a framework for the NANOAFNET-NANO-NET (Nanosciences African Network) Africa Chair in Nanoscience/Nanotechnology, College of Graduate Studies, University of South Africa.