Se presentan los datos de recolecta de cuatro nuevos registros de arañas para el estado de Guanajuato: Argiope argentata (Fabricius 1775), Castianeira dorsata (Banks 1898), C. plorans (O.P.Cambridge 1898) y Selenops gracilis Muma 1953. Adicionalmente, se proporcionan algunos datos de…

The Kumamoto oyster, Crassostrea sikamea, starts gametogenesis as young as 71 days old from spawning (35 days from post-settlement) with a mean shell height of 3.0 mm. This information constitutes a new record in age-size for gametogenesis in oysters for…

Analytic approximants for the eigenvalues of the one-dimensional Schrödinger equation with potentials of the form V(x) = xª + λx b are found using a multi-point quasi-rational approximation technique. This technique is based on the use of the power series…

Current-voltage dependence in In2O3-SrO ceramics contains a region where the current is increased weaker than the voltage. Such behavior is observed in oxygen atmosphere and is not registered in an inert one. Nonlinear current-voltage dependence is explained in terms of…

Through the use of non-destructive optical techniques to measure surfaces with high accuracy, a Mach-Zehnder Radial-Shear interferometer (MZRI) was implemented to analyze the radial slope of phase objects using simultaneous phase-shifting interferometry (SPSI). This optical configuration allows one to simultaneously…

Smoker's craving is one of the most important problems in tobacco cessation treatment. The aim of this study was to elaborate a self report questionnaire to assess smoking urge. Development process was carried out in two parts: construction of items…

A new species of the Dahlibruchus genus is described and information is given about its bionomics and host plants, also are mentioned general aspects about the archeological site where the insect was found.

The avocado seed moth, Stenoma catenifer Walsingham, is recorded for the first time in the State of Queretaro, Mexico. Aspects about its habits and behavior are described.

We explore the urban structure of eight metropolitan areas that surround Mexico City, forming its regional belt, by identifying spatial clusters within metropolitan areas with a regionally standardized local-spatial-autocorrelation procedure. The analysis reveals clear concentric urban ring patterns around the…

An isolated supraorbital horncore collected from the Olmos Formation near Múzquiz is among the longest ever found, and records the presence in this area of a very large ceratopsid. The specimen probably pertains to a chasmosaurine, but differs significantly from…