Taxonomic status of Bambusaspis miliaris : B. robusta, and B. pseudomiliaris (Hemiptera: Coccoidea: Asterolecaniidae)

Based on an assessment of 50 morphological characters from 110 specimens of Bambusaspis miliaris (BoisduvalI869), B. robusta (Green 1908), andB. pseudomiliaris (Green 1922) from different geographic regions around the world, we conclude that these specimens represent the same species. Therefore, the taxa B. robusta and B. pseudomiliaris are considered junior subjective synonyms of B. miliaris

Taxonomic Status of \u3ci\u3eBambusaspis miliaris\u3c/i\u3e, \u3ci\u3eB. robusta\u3c/i\u3e, and \u3ci\u3eB. pseudomiliaris\u3c/i\u3e (Hemiptera: Coccoidea: Asterolecaniidae)

Based on an assessment of 50 morphological characters from 110 specimens of Bambusaspis miliaris (Boisduval 1869), B. robusta (Green 1908), and B. pseudomiliaris (Green 1922) from different geographic regions around the world, we conclude that these specimens represent the same species. Therefore, the taxa B. robusta and B. pseudomiliaris are considered junior subjective synonyms of B. miliaris

Taxonomic Status of \u3ci\u3eBambusaspis miliaris\u3c/i\u3e, \u3ci\u3eB. robusta\u3c/i\u3e, and \u3ci\u3eB. pseudomiliaris\u3c/i\u3e (Hemiptera: Coccoidea: Asterolecaniidae)

Based on an assessment of 50 morphological characters from 110 specimens of Bambusaspis miliaris (Boisduval 1869), B. robusta (Green 1908), and B. pseudomiliaris (Green 1922) from different geographic regions around the world, we conclude that these specimens represent the same species. Therefore, the taxa B. robusta and B. pseudomiliaris are considered junior subjective synonyms of B. miliaris

Nanoscale periodicity in stripe-forming systems at high temperature: Au/W(110)

We observe using low-energy electron microscopy the self-assembly of monolayer-thick stripes of Au on W(110) near the transition temperature between stripes and the non-patterned (homogeneous) phase. We demonstrate that the amplitude of this Au stripe phase decreases with increasing temperature and vanishes at the order-disorder transition (ODT). The wavelength varies much more slowly with temperature and coverage than theories of stress-domain patterns with sharp phase boundaries would predict, and maintains a finite value of about 100 nm at the ODT. We argue that such nanometer-scale stripes should often appear near the ODT.Comment: 5 page

Produção e qualidade de forrageiras perenes de verão em solo hidromórfico no litoral sul do Rio Grande do Sul.

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Revision of the family Asterolecaniidae (Hemiptera: Coccomorpha) in Argentina

The Asterolecaniidae (Hemiptera: Coccomorpha), known as pit scales, are currently represented by 11 genera and 52 species in the Neotropical region, and by five species in Argentina. The goal of this study is to review and update the information currently known about the biodiversity of Asterolecaniidae in Argentina. We describe Argenta Granara de Willink new genus, Argenta eduardoi Granara de Willink new species, Mycetococcus ligae Granara de Willink new species, and Sclerosococcus williamsi Granara de Willink new species; an illustration of Pollinia pollini (Costa) is also included; the species Asterolecanium puteanum Russell and Russellaspis pustulans (Cockerell) are noted for the first time in Argentina. Dichotomous keys to the genera of Asterolecaniidae and the species of Asterolecanium Targioni-Tozzetti, Mycetococcus Ferris, and Sclerosococcus McKenzie in Argentina are presented. This work increases the number of known species in Argentina to ten. Asterolecaniidae (Hemiptera: Coccomorpha), conocidas como “pit scales” están representadas por 11 géneros y 52 especies en la región Neotropical y cinco especies en la Argentina. El objetivo de este estudio es revisar y actualizar la información conocida acerca de la biodiversidad de Asterolecaniidae en Argentina. Se describe Argenta Granara de Willink nuevo genero, Argenta eduardoi Granara de Willink nueva especie, Mycetococcus ligae Granara de Willink nueva especie y Sclerosococcus williamsi Granara de Willink nueva especie; se incluye también una ilustración de Pollinia pollini (Costa) y se cita por primera vez para el país a Asterolecanium puteanum Russell y Russellaspis pustulans (Cockerell). Se presenta una clave de los géneros de Asterolecaniidae y claves de las especies de Asterolecanium Targioni-Tozzetti, Mycetococcus Ferris y Sclerosococcus McKenzie registrados en la Argentina. Este trabajo eleva a diez el número de especies conocidas en la Argentina

Labyrinthine Island Growth during Pd/Ru(0001) Heteroepitaxy

Using low energy electron microscopy we observe that Pd deposited on Ru only attaches to small sections of the atomic step edges surrounding Pd islands. This causes a novel epitaxial growth mode in which islands advance in a snakelike motion, giving rise to labyrinthine patterns. Based on density functional theory together with scanning tunneling microscopy and low energy electron microscopy we propose that this growth mode is caused by a surface alloy forming around growing islands. This alloy gradually reduces step attachment rates, resulting in an instability that favors adatom attachment at fast advancing step sections

Anomalous Behavior of Ru for Catalytic Oxidation: A Theoretical Study of the Catalytic Reaction CO + 1/2 O_2 --> CO_2

Recent experiments revealed an anomalous dependence of carbon monoxide oxidation at Ru(0001) on oxygen pressure and a particularly high reaction rate. Below we report density functional theory calculations of the energetics and reaction pathways of the speculated mechanism. We will show that the exceptionally high rate is actuated by a weakly but nevertheless well bound (1x1) oxygen adsorbate layer. Furthermore it is found that reactions via scattering of gas-phase CO at the oxygen covered surface may play an important role. Our analysis reveals, however, that reactions via adsorbed CO molecules (the so-called Langmuir-Hinshelwood mechanism) dominate.Comment: 5 pages, 4 figures, Phys. Rev. Letters, Feb. 1997, in prin

A lei da inovação tecnológica na Embrapa Clima Temperado.

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