First record of an indoor pest sawtoothed grain beetle Oryzaephilus surinamensis (Coleoptera: Silvanidae) from wild outdoor wood ant nest

Alive individual adult sawtoothed grain beetle Oryzaephilus surinamensis (Linnaeus, 1758) was discovered inside a nest mound of the red wood ant Formica rufa Linnaeus, 1758 during a survey of myrmecophilous invertebrates. The sawtoothed grain beetle is a widespread indoor pest that has not previously been found in an ant nest. It is one of the most common pests in stored grain and cereal products, but the natural life-style of the species is not known. As the site of discovery was exceptional, we verified the species identification using the DNA barcode. If the sawtoothed grain beetle can live in mounds of red wood ants, the mounds may become widespread source habitats for the future infestations of this serious stored product pest

A supportive family environment in childhood enhances the level and heritability of sense of coherence in early adulthood

Peer reviewe

Los hormigones con polímeros en la construcción: propiedades y aplicaciones

The use of resins in construction is not a new phenomenon although even nowadays they are little understood by the user. This is made even more obvious in concretes y with resins in which these are yet another constituent material of concrete. The aim of the present article is to show those types of concretes with resins which exist in the construction field, pointing out those properties which give it advantages in determined types of applications (Repairs, prefabricated buildings, and others). This article is trying briefly to provide the technician with an understanding of these materials and to show him/her the suitable fields of application where they are competitive.Las resinas en la construcción son conocidas desde hace años si bien aún hoy en día resultan poco comprendidas para el usuario. Esto se hace aún más patente en los hormigones con resinas, en las que éstas son un material constituyente más del hormigón. El presente artículo tiene por objeto mostrar los tipos de hormigones con resinas existentes en el campo de la construcción señalando las propiedades que le confieren unas ventajas frente a determinados tipos de aplicaciones (reparaciones, prefabricados, otras). Con este artículo se pretende, de forma sucinta, facilitar al técnico la comprensión de estos materiales así como mostrarle los campos idóneos de aplicación donde son competitivos

Unexpected differences between thermal and photoinitiated cationic curing of a diglycidyl ether of bisphenol A modified with a multiarm star poly(styrene)-b-poly(ε-caprolactone) polymer

The effect of adding a multiarm star poly(styrene)-b-poly(ε-caprolactone) polymer on the cationic thermal and photoinitiated curing of diglycidyl ether of bisphenol A was studied. This star-polymer decelerated the thermal curing of diglycidyl ether of bisphenol A and modified the final structure of the epoxy matrix. The photocuring was influenced significantly by the addition of the multiarm star. When the proportion of this modifier added was 5%, much more time was necessary for complete photocuring (160 min at 40ºC). In the presence of 10% of modifier, the degree of photocuring reached was very low (0.196 at 120°C). A subsequent thermal post-curing was necessary to cure completely the system. During photocuring in presence of poly(styrene)-b-poly(ε-caprolactone), the formation of dormant species, which are reactivated when the temperature increases, takes places. The kinetics of the thermal curing and the photocuring was analyzed using an isoconversional method due to the complexity of the reactive process. Applying this method, it has been confirmed the dependence of activation energy on the degree of conversion. The fracture morphology analyzed by scanning electron microscopy exhibited a second phase originated during photocuring by the presence of the modifier