Contribució al coneixement dels lepidòpters del sud de Catalunya. I: Delta de l'Ebre

On the present work is given at know a census of the heterocera of the Delta de l'Ebre (Tarragona), with a total from 117 species. The studied is the recolleted one, year 1984, using eight traps by light of mercury and one trap of Heath's light actinic.En el presente trabajo se da a conocer un censo de los heteróceros del Delta del Ebro (Tarragona), con un total de 117 especies. El material estudiado es el recolectado durante el ario 1984, utilizando ocho trampas de luz de mercurio y una trampa actinica de Heath

A Study on Gas Penetration and Fingering Behavior in Injection Molding of Polymer and Powder Metal Feedstock

The effect of processing variables on the level of gas penetration in parts fabricated by gas-assisted injection molding from two different materials was compared. The materials used were polypropylene and stainless steel powder metal/thermoplastic feedstock. Software simulation and physical experiments were conducted. Taguchi analysis was used to reduce the number of experiment trials and to find the optimum processing conditions. Four different variables were changed using nine different combinations. The processing variables are the pressure, the delay time before gas is injected, the temperature of the material injected, and the amount of the material injected. The results showed that the most critical variable in the experiment is shot size followed by gas pressure, delay time and material

Lifetime Measurement of the 6s Level of Rubidium

We present a lifetime measurements of the 6s level of rubidium. We use a time-correlated single-photon counting technique on two different samples of rubidium atoms. A vapor cell with variable rubidium density and a sample of atoms confined and cooled in a magneto-optical trap. The 5P_{1/2} level serves as the resonant intermediate step for the two step excitation to the 6s level. We detect the decay of the 6s level through the cascade fluorescence of the 5P_{3/2} level at 780 nm. The two samples have different systematic effects, but we obtain consistent results that averaged give a lifetime of 45.57 +- 0.17 ns.Comment: 10 pages, 9 figure

Valencian museums of ethnology

El artículo repasa el panorama de los museos de etnología valencianos desde diferentes perspectivas. En una primera parte del trabajo, se aportan algunos datos de tipo histórico sobre los considerados “primeros” museos de etnografía, y se propone un análisis de su distribución geográfica, así como de las principales temáticas reflejadas en estas instituciones. La situación de la museografía etnográfica valenciana se describe en la segunda mitad del artículo, planteando un panorama diverso en el que conviven planteamientos clásicos con apuestas innovadoras.This paper aims to review the panorama of the ethnographic museums in the Valencian region (Mediterranean Spain). In the first part of the work, some historic data on the creation of ethnographic museums in the area is shown. Along with these, the geographic distribution as well as thematic definition of this type of museums is analyzed. Finally, the second part of the paper is devoted to describe the museographic present of these institutions in the Valencian country area

Seeding hESCs to achieve optimal colony clonality

Human embryonic stem cells (hESCs) and induced pluripotent stem cells (iPSCs) have promising clinical applications which often rely on clonally-homogeneous cell populations. To achieve this, it is important to ensure that each colony originates from a single founding cell and to avoid subsequent merging of colonies during their growth. Clonal homogeneity can be obtained with low seeding densities; however, this leads to low yield and viability. It is therefore important to quantitatively assess how seeding density affects clonality loss so that experimental protocols can be optimised to meet the required standards. Here we develop a quantitative framework for modelling the growth of hESC colonies from a given seeding density based on stochastic exponential growth. This allows us to identify the timescales for colony merges and over which colony size no longer predicts the number of founding cells. We demonstrate the success of our model by applying it to our own experiments of hESC colony growth; while this is based on a particular experimental set-up, the model can be applied more generally to other cell lines and experimental conditions to predict these important timescales

Correlated random walks of human embryonic stem cells in vitro

We perform a detailed analysis of the migratory motion of human embryonic stem cells in two-dimensions, both when isolated and in close proximity to another cell, recorded with time-lapse microscopic imaging. We show that isolated cells tend to perform an unusual locally anisotropic walk, moving backwards and forwards along a preferred local direction correlated over a timescale of around 50 min and aligned with the axis of the cell elongation. Increasing elongation of the cell shape is associated with increased instantaneous migration speed. We also show that two cells in close proximity tend to move in the same direction, with the average separation of m or less and the correlation length of around 25 μm, a typical cell diameter. These results can be used as a basis for the mathematical modelling of the formation of clonal hESC colonies

Mining investment and a fiscal regime that promotes the investment: an inter-temporal model

This paper aims to show how both mining company and government will improve financially by promoting the reinvestment of profits. It will start with a theoretical framework about the mining investing sustainability. Then, an inter-temporal model will be proposed to formalize, theoretically, how the reinvestment will improve, in present value, profits and revenues for both firm and government, respectively. Also, empirical evidence will be shown, particularly, for Peru and Chile. Then, an approach to strong sustainability in Peru will be set by explaining the main variables of sustainability in the Peruvian mining sector as well as its main sustainability items. Finally, some conclusions will be presented.

Larnax toledoana Barboza & S. Leiva

Rumbo a Valladolid desde Yanganá, al costado de la rutapublishedVersio

Larnax toledoana Barboza & S. Leiva

Rumbo a Valladolid desde Yanganá, al costado de la ruta. 500 m adelante via a ValladolidpublishedVersio

Larnax toledoana Barboza & S. Leiva,

Rumbo a Valladolid desde Yanganá, al costado de la rutapublishedVersio