Advancement of materials technology has been immense, especially in the past 30 years. Ceramics has not been new to dentistry. Porcelain crowns, silica fillers in composite resins, and glass ionomer cements have already been proved to be successful. Materials used in the replacement of tissues have come a long way from being inert, to compatible, and now regenerative. When hydroxyapatite was believed to be the best biocompatible replacement material, Larry Hench developed a material using silica (glass) as the host material, incorporated with calcium and phosphorous to fuse broken bones. This material mimics bone material and stimulates the regrowth of new bone material. Thus, due to its biocompatibility and osteogenic capacity it came to be known as “bioactive glass-bioglass.” It is now encompassed, along with synthetic hydroxyapatite, in the field of biomaterials science known as “bioactive ceramics.” The aim of this article is to give a bird's-eye view, of the various uses in dentistry, of this novel, miracle material which can bond, induce osteogenesis, and also regenerate bone.
Nano-sized materials are known to play important role in basic and applied sciences thus the metal and metal oxide nanoparticles have been intensively studied in the past decade [1,2]. The metal oxides particularly exhibit fascinating properties such as electronic, catalytic, magnetic and antimicrobial activity owing to their large surface area to volume ration due to a high fraction of atoms [3,4]. Zinc oxide nanoparticles have a wide band gap of 3.3 eV at room temperature and high excitation binding energy of 60 meV, which helps it to demonstrate outstanding catalytic, optical, photochemical and electronic properties [5,6]. Zinc oxide nanoparticles are known to possess unique UV filtering, antibacterial, antifungal properties also which leads to its extensive use in cosmetic and healthcare industries [7-9]. Previous studies suggest that the strong antibacterial activity of zinc oxide nanoparticles against a variety of pathogenic Gram-positive and Gram-negative bacteria attributed to its capacity of releasing Zn 2+ ion from ZnO complex and interruption of lipid bilayer integrity, ROS generation and subsequent damage to DNA and protein of the host cell [10,11]. Chemical and physical methods of nanoparticle synthesis have
Levels of several intermediary metabolites were measured in cells grown in acetate medium in order to test the hypothesis that the glyoxylate cycle is repressed by phosphoenolpyruvate (PEP). Wild-type cells had less PEP than either isocitrate dehydrogenase - deficient cells (which had greater isocitrate lyase activity than the wild type) or isocitrate dehydrogenase - deficient, citrate synthase-deficient cells (which are poorly inducible). Thus induction of the glyoxylate cycle is more complicated than a simple function of PEP concentration. No correlation between enzyme activity and the level of oxaloacetate, pyruvate, or citrate was found either. Citrate was synthesized in citrate synthase-deficient mutants, possibly via citrate lyase.
Aim: The aim of the study was to employ cumin oil in the synthesis of silver nanoparticles and check the antioxidant activity of the cumin oil mediated silver nanoparticles. Background: The introduction of Nanoparticles (NPs) has revolutionized every field including medicine, nutrition and energy. The use of nanotechnology in medicine especially for drug delivery is shown to have various benefits. Nanoparticles are being used to reduce toxicity and side effects that drugs may impose to the patient. Cumin (Cuminum cyminum) is a common spice used for its distinct aromatic effect. Plant mediated biological synthesis of nanoparticles has been gaining importance due to its simplicity and eco friendliness. This study therefore was aimed to synthesize cumin oil mediated silver nanoparticles and assess its antioxidant activity. Materials and Methods: Cumin oil mediated silver nanoparticles were initially synthesised and characterised by UV-Visible spectrophotometer and TEM. Further the cumin oil mediated AgNPs were subjected to DPPH assay to determine the antioxidant activity. Results: Cumin oil mediated AgNPs were biosynthesised with ease and showed good antioxidant activity compared to standard. Conclusion: This study conclude that cumin seed oil mediated silver nanoparticles have the potential to be used as an effective antioxidant. Hence, it may be employed in large scale production and may be used in many medicinal applications where there is a need for antioxidant.
Nanoparticles serve to reduce toxicity, enhance bioactivity and improve targeting. Selenium nanoparticles (SeNPs) are explored because of it's unique characteristics and various known therapeutic benefits such as antioxidants activities and reducing risk of cancer. In this study, arrow root which is a starch obtained from tapioca or cassava is mediated with SeNPs and studied for it's anti-inflammatory and cytotoxic effect. The plant extract of arrow root was prepared and mixed with the sodium selenite solution. The solution is kept in a magnetic stirrer while being observed for any colour change. The synthesis of nanoparticles is observed using UV-vis spectrophotometry. Then the anti-inflammatory activity is observed using albumin denaturation assay and cytotoxic analysis conducted on brine shrimp nauplii. The results showed that there was a lower toxicity rate of SeNPs and significant anti-inflammatory activity which concludes that these nanoparticles can be used in various drug designing aspects in future.
Background: Lutein is a carotenoids vitamin rich in many fruits and vegetables and also available in multivitamin products. It is consumed for its effect on eye disease, cancer, diabetes and other health conditions. Recently, herbal preparations are increasingly used in healthcare systems and concomitant administration of synthetic medications may cause pharmacokinetic or pharmacodynamic interactions leading to very serious medical problems. Understanding the ability of herbal extracts and preparations to modulate the metabolizing enzymes can help the health system for proper treatment of patients and thereby can avoid many adverse effects associated with it. The aim of the study was to find the effect of lutein isolated from Tagetes erecta L on cytochrome P450 isoform CYP3A4. Materials and Methods: The different concentrations of lutein (5-100µg/ml), potassium phosphate buffer, CYP450 reagent and substrate 7-Benzyloxy-4-trifluoromethylcoumarin (BFC) were added to a 96-well plate. The fluorescent intensities of the products were measured by Perkin Elmer Enspire fluorescence reader using an excitation and emission wavelength of 405 nm and 460 nm, respectively to examine the effect of lutein on Cytochrome P 450 isoform CYP3A4 and the IC 50 was calculated by plotting concentrations of lutein against the corresponding percent inhibition. Results: All the tested concentrations of lutein showed potent inhibition against CYP3A4 in a dose-dependent manner. The IC 50 value was found to be 35.27µg/ml. Conclusion: The inhibitory effect of lutein indicates the possibilities of herb-drug interaction if it is co-administered with prescribed drugs that are normally metabolised by CYP3A4 enzyme.
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