Marine-derived natural products are rich source of secondary metabolites with huge potentials including novel therapeutic agents. Marine algae are considered to be a good source of secondary metabolites with versatile bioactivities. During the last few decades, researches related to natural products obtained from brown algae have remarkably escalated as they contain active compounds with varied biologically activities like antimicrobial, anticancer, antioxidant, anti-inflammatory, antidiabetic, and antiparasitic properties. The main bioactive components such as phlorotannin, fucoxanthin, alginic acid, fucoidan, and laminarin have been briefly discussed here, together with their composition and biological activities. In this review, the biological function of extracts and the metabolites of brown algae as well as their pharmacological impacts with the description of the possible mechanism of their action are described and discussed. Also, this study is expected to examine the multifunctional properties of brown algae that facilitate natural algal products, including the ability to integrate these functional properties in a variety of applications.
In this study, a structure of single-phase seven-level boost DC-link cascaded multilevel inverter (BDCLCMLI) is proposed. It consists of boost converter, DC-link module and H-bridge inverter. Compared with conventional CMLI and two level H-bridge inverter configurations, the proposed system results in reduction of voltage stress across the inverter switches, reduced power switches, DC source count and gate drive requirements. DC-link switching is achieved by multicarrier sinusoidal pulse-width modulation technique which results in improved quality of obtained output AC power. Reduction in DC source and switch count makes the system more cost effective. A simulation and prototype model of seven-level BDCLCMLI system is developed and its performance is analysed for various operating conditions.
The nanoparticles are incorporated into the composite to mark their unique properties. This work investigates the hybrid epoxy nanocomposite and the impact of nanographite reinforcement. The composite was prepared by using a mechanical stirring technique. The amount of nanographite was added in different volumes, i.e., 1.0, 1.5, and 2.0 wt.%. Results of mechanical and dynamic loading properties were analyzed in accordance to the quantity of nano-G. The fiber and matrix interfacial bonding enrichments were evident in high-resolution SEM images-tensile fracture surface. Finally, the optimum content of nanoparticle which impacts the sample greatly was found to be 1.5 wt.%.
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