Species of the genus Elsholtzia have great potential for bioactive substances. Although this species has been used a lot in traditional medicines, most of it is only used based on the experience gained or left by forerunners without much knowledge of the species scientific basis. Therefore, the investigation, research, evaluation of chemical composition and screening of potential bioactive substances from plants of the genus Elsholtzia, especially those endemic to Vietnam, will be of great scientific and practical significance, actively contributing to the rational exploitation and use of the country's natural resources, thereby orienting the application of Elsholtzia essential oil in research and develops a number of food, pharmaceutical and cosmetic products. Using the method of extracting essential oils by steam distillation and the evaluation of antibacterial activity by agar diffusion method with the following contents: Results analysis, evaluation and screening of essential oils of some species of the genus Elsholtzia with biological activity obtained in different regions. Research results on mixing ratio to create antibacterial hand sanitizer products, completing the process and calculating the cost of antibacterial hand sanitizer products.
We have used the Monte Carlo method based on theory of successive reflections and ray tracing to calculate the average normal directional effective emissivities of isothermal cylindrical-inner-cone cavities for various geometrical parameters. A simplified specular-directional diffuse reflection model was applied in our calculations for cavities working in the infrared spectral range. Our results are in good agreement comparing with what obtained by other authors. The algorithm developed by us has an advantage in simplicity and time saving of calculations. It can be used in blackbody cavity design considerations, especially in the cylindrical-inner-cone cases.
A kind of bimetallic Cu/Co zeolitic imidazole frameworks (CuCo-ZIFs) has been successfully synthesized in ethanol solvent by ultrasound method. The morphology, structural features and physicochemical properties of CuCo-ZIFs were analyzed by several techniques including powder X-ray diffraction, thermo-gravimetric analysis, Fourier-transform infrared spectroscopy,, energy-dispersive X-ray spectroscopy, scanning electron microscope, and nitrogen physisorption measurements. The results showed that CuCo-ZIFs nanocrystals demonstrated a ZIF-67-like polyhedral morphology with high thermal stability. The Brunauer-Emmett-Teller surface areas of CuCo-ZIFs were achieved approximately 1172 m2/g, while its Langmuir surfaces areas were achieved approximately 1907 m2/g.
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