In this article, the types of renewable energies and the environmental effects of consuming these energies are studied. Energy is one of the things necessary for economic and social development and improving the quality of life, and the presence of continuous and sustainable economic energy is essential for any economic development and growth. Humankind has been aware of renewable energies such as biomass and geothermal energy for a long time and has used these energies as heat sources for shelter. With the beginning of the extraction of fossil fuels such as oil and coal and unlimited access to these products, the use of renewable energy sources, except in remote places and forest areas, has become limited and forgotten. Currently in Iraq, fossil fuels such as oil and gas are the most consumed sources of energy, and due to the limited fossil energy resources in addition to the problems caused by the consumption of these types of fuels, one must look for a place to use renewable energy and new energies for future generations. Iraq has many opportunities related to the use of rich sources of renewable and new energy such as wind energy, geothermal energy, hydroelectric energy, and solar energy. The use of these renewable energy sources not only reduces the use of limited fossil fuel resources but also prevents the harmful effects of greenhouse gases in the atmosphere and global warming. In this article, renewable and new energies such as solar energy, wind energy, geothermal energy, biomass, biogas, hydropower, and hydrogen are introduced. The technology used to harness renewable and new energies were discussed in addition to its environmental impacts, Iraq's talents, and the possibility of using these energy sources. A review of renewable and new energies shows that the development and use of renewable energies are very suitable alternatives to fossil fuels and the use of some renewable energy sources such as the sun and wind can help maintain the health of the environment.
(10)
(2)
(1)
(4)
(3)
Background: A great dental and biomedical interest had been paid to silver nanoparticles because of their antimicrobial activity. Objective: To evaluate the antimicrobial and cytotoxic activity of a newly developed Nano-silver fluoride that was synthesized from moringa oleifera leaf extract against S. mutants. Material and method: The green synthesis method was used to prepare Nano-silver fluoride from moringa oleifera leaf extract. The minimum inhibitory concentration and the minimum bactericidal concentration were evaluated using brain heart infusion plates, while the cytotoxicity was evaluated by the hemolytic activity. Results: Nano-silver fluoride had a bactericidal and bacteriostatic effect (MIC was 60 ppm a
... Show More
(8)
(5)
Abstract
A series of new 4(3H)-quinazolinone derivatives (S1-S4) were synthesized and characterized by FTIR,1HNMR and 13CNMR .Their cytotoxic activity against a set of human cancer cell lines MCF-7 (breast) and A549 (lung) was evaluated using MTT assay. To detect their selectivity toward cancer cells, the compounds were also tested against epithelial cells derived from normal human fibroblast (NHF). Methotrexate (MTX) was used as a reference for comparison . All the tested compounds exhibited toxicity against the normal cells lower than cancer cells. All the tested compounds displayed higher cytotoxicity against lung cancer cell line (A549) than MTX with the most
... Show More
(11)
(4)
(116)
(116)
Background: This in vitro study compares a novel calcium-phosphate etchant paste to conventional 37% phosphoric acid gel for bonding metal and ceramic brackets by evaluating the shear bond strength, remnant adhesive and enamel damage following water storage, acid challenge and fatigue loading. Material and Methods: Metal and ceramic brackets were bonded to 240 extracted human premolars using two enamel conditioning protocols: conventional 37% phosphoric acid (PA) gel (control), and an acidic calcium-phosphate (CaP) paste. The CaP paste was prepared from β-tricalcium phosphate and monocalcium phosphate monohydrate powders mixed with 37% phosphoric acid solution, and the resulting phase was confirmed using FTIR. The bonded premolars were exp
... Show More
(19)
(13)