Harmonic analysis and reduction of the scattered field from electrically large cloaked metallic cylinders

In this paper, an analysis of the spectral composition of the scattered field from coated metallic cylinders is performed, focusing particularly on the cloaking of electrically large structures. An expression of the scattering coefficients is derived, considering both a dielectric and a metasurface coating. Modeling the metasurface as a surface impedance boundary condition, the surface impedance, which annuls one harmonic of the scattered field, is formulated in a closed and compact form. Moreover, in the case of cylinders with radius comparable with the wavelength of interest, it is demonstrated that a reduction of the scattering is possible by using a homogeneous metasurface coating, which presents a positive surface reactance. In particular, a reduction of the scattering width of 4 dB is achieved for a cylinder radius of a = 0.917λ0

5-(carbamoylmethylene)-oxazolidin-2-ones as a promising class of heterocycles inducing apoptosis triggered by increased ROS levels and mitochondrial dysfunction in breast and cervical cancer

Oxazolidinones are antibiotics that inhibit protein synthesis by binding the 50S ribosomal subunit. Recently, numerous worldwide researches focused on their properties and possible involvement in cancer therapy have been conducted. Here, we evaluated in vitro the antiproliferative activity of some 5-(carbamoylmethylene)-oxazolidin-2-ones on MCF-7 and HeLa cells. The tested compounds displayed a wide range of cytotoxicity on these cancer cell lines, measured by MTT assay, exhibiting no cytotoxicity on non-tumorigenic MCF-10A cells. Among the nine tested derivatives, four displayed a good anticancer potential. Remarkably, OI compound showed IC50 values of 17.66 and 31.10 µM for MCF-7 and HeLa cancer cells, respectively. Furthermore, we assessed OI effect on the cell cycle by FACS analysis, highlighting a G1 phase arrest after 72 h, supported by a low expression level of Cyclin D1 protein. Moreover, mitochondrial membrane potential was reduced after OI treatment driven by high levels of ROS. These findings demonstrate that OI treatment can inhibit MCF-7 and HeLa cell proliferation and induce apoptosis by caspase-9 activation and cytochrome c release in the cytosol. Hence, 5-(carbamoylmethylene)-oxazolidin-2-ones have a promising anticancer activity, in particular, OI derivative could represent a good candidate for in vivo further studies and potential clinical use

Effect of Aqueous Ozone on the NF-κB System

Ozone has been proposed as an alternative oral antiseptic in dentistry, due to its antimicrobial power reported for gaseous and aqueous forms, the latter showing a high biocompatibility with mammalian cells. New therapeutic strategies for the treatment of periodontal disease and apical periodontitis should consider not only antibacterial effects, but also their influence on the host immune response. Therefore, our aim was to investigate the effect of aqueous ozone on the NF-κB system, a paradigm for inflammationassociated signaling/transcription. We showed that NF-κB activity in oral cells stimulated with TNF, and in periodontal ligament tissue from root surfaces of periodontally damaged teeth, was inhibited following incubation with ozonized medium. Under this treatment, IκBalpah proteolysis, cytokine expression, and κB-dependent transcription were prevented. Specific ozonized amino acids were shown to represent major inhibitory components of ozonized medium. In summary, our study establishes a condition under which aqueous ozone exerts inhibitory effects on the NF-κB system, suggesting that it has an antiinflammatory capacity

Reply: Is CD1a involved in antitumour immune responses during carcinogenesis?

© 2004 Cancer Research UKPresents a response by the authors to a letter to the editor about their article "Is CD1a involved in antitumour immune responses during carcinogenesis?," published in the February 23, 2004 issue of the "British Journal of Cancer"B.J. Coventry and S. Heinze

Ideal Magnetic Dipole: Scattering and Mantle Cloaking Effects

Artificial magnetic response is one of the recent research topics that is receiving significant attention. Nevertheless, because of the difficulties in exciting not only the magnetic moment but also multipoles of different order, and the presence of losses, the efficiency of its generation is strongly compromised. On the other hand, the presence of a cloaking phenomena can be described in terms of anapole mode, which consists in the compensation of the scattering due to the moment of the electric dipole with the toroidal one. Because of this effect, the remaining part of the field will exhibit a strong(er) magnetic dipole moment response. In the present study, the response of a cloaking device based on a real-life geometry is therefore analysed with particular focus the anapole mode excitation and ideal magnetic dipole behaviour

Needles in the EST Haystack: Large-Scale Identification and Analysis of Excretory-Secretory (ES) Proteins in Parasitic Nematodes Using Expressed Sequence Tags (ESTs)

Excretory-secretory (ES) proteins are an important class of proteins in many organisms, spanning from bacteria to human beings, and are potential drug targets for several diseases. In this study, we first developed a software platform, EST2Secretome, comprised of carefully selected computational tools to identify and analyse ES proteins from expressed sequence tags (ESTs). By employing EST2Secretome, we analysed 4,710 ES proteins derived from 0.5 million ESTs for 39 economically important and disease-causing parasites from the phylum Nematoda. Several known and novel ES proteins that were either parasite- or nematode-specific were discovered, focussing on those that are either absent from or very divergent from similar molecules in their animal or plant hosts. In addition, we found many nematode-specific protein families of domains “transthyretin-like” and “chromadorea ALT,” considered vaccine candidates for filariasis in humans. We report numerous C. elegans homologues with loss-of-function RNAi phenotypes essential for parasite survival and therefore potential targets for parasite intervention. Overall, by developing freely available software to analyse large-scale EST data, we enabled researchers working on parasites for neglected tropical diseases to select specific genes and/or proteins to carry out directed functional assays for demystifying the molecular complexities of host–parasite interactions in a cell

Bacterial–viral load and the immune response in stable and exacerbated COPD: Significance and therapeutic prospects

Chronic obstructive pulmonary disease (COPD) is characterized by persistent airflow limitation and an abnormal inflammatory response of the lung. Bacteria and viruses are a major cause of COPD exacerbations and may contribute to COPD progression by perpetuating the inflammatory response in the airways. Bacterial variety diminishes with increasing COPD severity. Respiratory viruses can colonize the lower respiratory tract in stable COPD, altering the respiratory microbiome and facilitating secondary bacterial infections. In this review, we present the most updated information about the role of bacteria and viruses in stable and exacerbated COPD. In our opinion, to optimize therapeutic strategies, the dynamic events involving bacterial–viral infections and related immune response in COPD phenotypes need to be better clarified. Our paper would address these points that we consider of great importance for the clinical management of COPD

Aroma characterization of mold resistant basewines for sparkling wine produced in a warm-temperate area at two different altitudes

In a recent context where consumers pay an increasing attention to sustainability and eco-friendly aspects in the decision-making process, the use of the resistant varieties in the winesector have returned to the attention. In this context, the use of mould-resistant grape varietieswould be an opportunity for sparkling wine producers as it can reduced the pesticideutilization in grape management and hence production costs. However, the use of the resistant varieties to produce the base wine may be strongly infl uenceddue to its requirements for a particular balance between sugars and acidity to ensure thequality of the fi nal product. In addition, the aromatic profi le of base wine plays a crucial rolein the perception of the quality of the sparkling wine. This work aims to study the volatile composition of base wines produced from fi ve resistantvarieties (Bronner, Solaris, Johanniter, Souvignier Gris, Vinera) cultivated in two experimentalvineyards located in Trentino (IT): one situated on the valley bottom and one in the hill. Theresults were comparing with those of Chardonnay, the main variety used in this areanowadays for this product, cultivated in the same plots. The volatiles were extracted from thebase wines and the GC-MS/MS analysis allowed to quantify the aromatic compoundsbelonging to six different chemical classes: acetates, ethyl esters, alcohols, fatty acids, terpenesand norisoprenoids. Among the varieties, Souvignier Gris was characterised by methyl salicylate and 1-hexanol,while Solaris stood out for the concentration of β-damascone, acetates and ethyl esters.Bronner showed signifi cant contents of some grape-derived metabolites, such as β-damasconeand linalool. This terpene was also present in higher quantities in Solaris and Johanniter.Regarding the location, acetates and ethyl esters were higher in base wines of the valleybottom and fatty acids, higher alcohols and terpenes in the hilly plot wines

Starter Cultures for Sparkling Wine

The sparkling wine market has expanded in recent years, boosted by the increasing demand of the global market. As for other fermented beverages, technological yeasts and bacteria selected to design commercial starter cultures represent key levers to maximize product quality and safety. The increasing economic interest in the sector of sparkling wine has also implied a renewed interest in microbial resource management. In this review, after a brief introduction, we report an overview of the main characterization criteria in order to select Saccharomyces cerevisiae strains suitable for use as starter cultures for the production of base wines and to drive re-fermentation of base wines to obtain sparkling wines. Particular attention has been reserved to the technological characterization aspects of re-fermenting phenotypes. We also analysed the possible uses of selected non-Saccharomyces and malolactic strains in order to differentiate specific productions. Finally, we highlighted the main safety aspects related to microbes of enological interest and underlined some microbial-based biotechnological applications helpful to pursue product and process innovations. Overall, the sparkling wine industry may find a relevant benefit from the exploitation of the wide resources associated with vineyard/wine microbial diversity