Tunable Double Negative Band Structure from Non-Magnetic Coated Rods

A system of periodic poly-disperse coated nano-rods is considered. Both the coated nano-rods and host material are non-magnetic. The exterior nano-coating has a frequency dependent dielectric constant and the rod has a high dielectric constant. A negative effective magnetic permeability is generated near the Mie resonances of the rods while the coating generates a negative permittivity through a field resonance controlled by the plasma frequency of the coating and the geometry of the crystal. The explicit band structure for the system is calculated in the sub-wavelength limit. Tunable pass bands exhibiting negative group velocity are generated and correspond to simultaneously negative effective dielectric permittivity and magnetic permeability. These can be explicitly controlled by adjusting the distance between rods, the coating thickness, and rod diameters

Effect of sewage sludge on the incidence of corn stalk rot caused by Fusarium.

During the last decades, sewage started to be treated in order to reduce the pollution of rivers, resulting in the production of a sludge rich in organic matter and nutrients, called sewage sludge. Among the alternatives for final discarding, the agricultural use is one of the most convenient, because it combines disposal and recycling. However, using sewage sludge as a fertilizer causes alterations in the physical, chemical and biological properties of the soils. The soilborne plant pathogens are highly influenced by the way the soil is managed; thus, sewage sludge may interfere with the occurrence of diseases caused by these microorganisms. The objective of this study was to evaluate the effect of sewage sludge on corn stalk rot, caused by Fusarium spp

Lente de contacto híbrida de geometría inversa en córnea irregular con presencia de isla central tras cirugía LASIK

La lente híbrida de geometría inversa PS ofrece una mejoría de la calidad visual en pacientes con córneas irregulares tras cirugía refractiva miópica, mostrándose como una excelente opción en aquellos casos en que el insuficiente lecho corneal imposibilita retratamientos posteriores

Analysis of the ecological preferences of spontaneous vegetation. Case study applied to winter cereals

Se efectuaron 100 muestreos florísticos en parcelas de trigo, avena, cebada, caracterizándose algunas variables como el pH, textura del suelo, contenido en fósforo y potasio, precipitación, tipos de suelos y cultivos. Se realizó un análisis de frecuencias y abundancia de las especies. El método estadístico usado para las preferencias ecológicas fue el Método de los Perfiles Ecológicos e Información Mutua complementado con la aplicación del Método de Análisis Canónico de Correspondencias. Según el Método de Perfiles Ecológicos e Información Mutua, la distribución de la vegetación estudiada está estrechamente relacionada con la textura y pH. Los resultados de la aplicación del criterio de información Akaike y función ANOVA confirman los mismos factores como discriminantes en la distribución de la vegetación.It was Conducted 100 floristic surveys in fields of wheat, oat, barley together with the measurement of some variables, such as pH, soil texture, phosphorus and potassium content, precipitation, soil types and type of crops. An analysis of frequency and abundance of species was performed. The statistical method used for ecological preferences was the Ecological profiles and Mutual Information methodology complemented with the Canonical Correspondence Analysis methodology. According the Method of Ecological profiles and Mutual Information, the distribution of species is closely related to texture and pH. The application of Akaike information criterion and ANOVA function confirm the same factors as discriminating the distribution of vegetation

Ovary Development and Maturation in Nezara viridula (L.) (Hemiptera: Pentatomidae)

Ovary development and maturation of Nezara viridula (L.) were evaluated by examining ovariole morphology and the alterations in the biochemical (protein synthesis related to reproduction) composition of the hemolymph. Quantitative and qualitative protein analyses were performed and ovary structural alterations for the pre-reproductive and reproductive stages were recorded. Total concentration of proteins in female hemolymph gradually increased until the end of the pre-mating stage, remaining unaltered thereafter. Proteins linked to reproduction (vitellogenins) appeared in the hemolymph 10 days after adult emergence and indicated the end of the pre-mating stage. After mating, total protein concentration in the hemolymph was lower compared to virgin females; vitellogenin levels were similar during most of the observation period. Oocyte development and maturation were gradual and age dependent. Ten-day-old females had chorionated oocytes ready for fertilization. Mating did not stimulate oocyte development in N. viridula, but the lack of mating activity appeared to have stimulated oocyte resorption in 17-day-old females.Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq

Stereoselective cycloaddition of 1-glucosyl-1,3-butadienes with tert-butyl 2H-azirine-3-carboxylate, glyoxylates and imines

Glucosyl dienes 1 have been reacted with the achiral 2H-azirine 4 and with glyoxylates, forming fused structures of type 5 and disaccharide-like compounds 7 with good to excellent selectivity. Glucosyl dienes 1 participated as dienophiles in reactions with Schiff bases derived from anilines forming isoquinolines 10 and 11. The diastereoselectivity of this reaction is poor.Fundação para a Ciência e Tecnologia - POCTI/32723/QUI/2000. FEDER