Anthopleura radians, una nueva especie de anémona de mar (Cnidaria: Actiniaria: Actiniidae) del norte de Chile, con comentarios sobre las otras especies del género del Océano Pacifico Sur

A new species of sea anemone, Anthopleura radians n. sp., is described from the intertidal zone of northern Chile and the taxonomic status of the other Anthopleura species from the South Pacific are discussed. A. radians n. sp. is characterized by a yellow-whitish and brown checkerboard-like pattern on the oral disc, adhesive verrucae along the entire column and a series of marginal projections, each bearing a brightly-colored acrorhagus on the oral surface. This is the seventh species of Anthopleura described from the South Pacific Ocean; each one distinguished by a particular combination of differences related to their coloration pattern, presence of zooxanthellae, cnidae, and mode of reproduction. Some of these species have not been reported since their original description and thus require to be taxonomically validated. A. hermaphroditica and A. aureoradiata are synonyms considering the lack of differences seen between live specimens, museum collections and published records. A. radians could also be a junior synonym of A. minima, however, no type material was found for testing this hypothesis. Furthermore, it is crucial to designate neotypes for A. inconspicua, A. rosea and A. minima since there are no name-bearing types reported for these species.Una nueva especie de anémona de mar, Anthopleura radians n. sp., es descrita para la zona intermareal del norte de Chile y el estatus taxonómico de las otras especies de Anthopleura del Pacifico Sur es discutido. A. radians n. sp. se caracteriza por el patrón de coloración amarillo-blanquecino y café tipo tablero de ajedrez del disco oral, las verrugas adhesivas a lo largo de toda la columna y una serie de proyecciones marginales, cada una provista de un notorio acroragio en la superficie oral. Esta es la séptima especie de Anthopleura descrita para el Océano Pacifico Austral; cada una se distingue a través de una combinación particular de diferencias relacionadas al patrón de coloración, presencia de zooxantelas, cnidocistos y modo de reproducción. Varias de estas especies no han vuelto a ser reportadas desde su descripción original y, por lo tanto, requieren ser taxonómicamente validadas. A. hermaphroditica y A. aureoradiata son sinónimos considerando la falta de diferencias observadas entre especímenes vivos, colecciones de museo y registros publicados. A. radians podría ser también un sinónimo moderno de A. minima, no obstante, no se encontró material tipo de esta especie para poner a prueba dicha hipótesis. Más aun, es crucial designar neotipos para A. inconspicua, A. rosea y A. minima dado que no hay tipos portanombres reportados para estas especies

The role of intermolecular coupling in the photophysics of disordered organic semiconductors: Aggregate emission in regioregular polythiophene

We address the role of excitonic coulping on the nature of photoexcitations in the conjugated polymer regioregular poly(3-hexylthiophene). By means of temperature-dependent absorption and photoluminescence spectroscopy, we show that optical emission is overwhelmingly dominated by weakly coupled H-aggregates. The relative absorbance of the 0-0 and 0-1 vibronic peaks provides a powerfully simple means to extract the magnitude of the intermolecular coupling energy, approximately 5 and 30 meV for films spun from isodurene and chloroform solutions respectively.Comment: 10 pages, 4 figures, published in Phys. Rev. Let

Determining exciton bandwidth and film microstructure in polythiophene films using linear absorption spectroscopy

We analyze the linear absorption spectrum of regioregular poly(3-hexylthiophene) films spun from a variety of solvents to probe directly the film microstructure and how it depends on processing conditions. We estimate the exciton bandwidth and the percentage of the film composed of aggregates quantitatively using a weakly interacting H-aggregate model. This provides a description of the degree and quality of crystallites within the film and is in turn correlated with thin-film field-effect transistor characteristics.Comment: Applied Physics Letters (in press); 9 pages, three figure

"Curso de Formación del Coordinador del Trabajo Forense en la Escena del Crimen"

La inspección de la escena del hecho puede ser uno de los puntos más críticos dentro de una investigación judicial penal. Este es un acto irreproducible y por ello debe ser encarada de manera tal que pueda extraerse la mayor cantidad de información antes de que se pierda por completo. La dirección de una investigación judicial en Argentina, como lo dice la legislación vigente, se encuentra a cargo del juez, quien la delega en el fiscal. Sin embargo, en la formación que estos dos funcionarios tienen para ocupar sus cargos, se profundiza mucho en cuestiones legales siendo muy escueta en otros puntos igual de importantes como lo son la criminalística o las ciencias forenses, dejando por lo tanto libradas éstas ramas al mero interés particular de cada funcionario. Esta extraña particularidad provoca, en el mejor de los casos, retrasos judiciales; y en los peores, pérdidas de pruebas que conllevan a la imposibilidad de esclarecer un delito. Es por ello que, desde el Programa Nacional de Criminalística, se ha impulsado una nueva figura denominada “Coordinador del Trabajo Forense de la Escena del Crimen”; quien será el encargado de asistir al fiscal en todas las cuestiones que tengan que ver con la Inspección Ocular Técnica de la escena del hecho, del levantamiento de indicios, de la remisión y seguimientos de los mismos en estudios periciales y de verificar que todos estos procesos se realicen siguiendo los protocolos actuales de investigación, y supervisar el respeto por los procedimientos a fin de que no vuelva en el futuro a caerse una pericia por falta de legalidad, convirtiéndose en dueños y responsables de la evidencia. Dicho Coordinador será el nuevo integrante en las fiscalías de toda la Argentina, y para fin de año, está planificada la capacitación de los primeros 500

Hardware Precoding Demonstration in Multi-Beam UHTS Communications under Realistic Payload Characteristics

In this paper, we present a new hardware test-bed to demonstrate closed-loop precoded communications for interference mitigation in multi-beam ultra high throughput satellite systems under realistic payload and channel impairments. We build the test-bed to demonstrate a real-time channel aided precoded transmission under realistic conditions such as the power constraints and satellite-payload non-linearities. We develop a scalable architecture of an SDR platform with the DVB-S2X piloting. The SDR platform consists of two parts: analog-to-digital (ADC) and digital-to-analog (DAC) converters preceded by radio frequency (RF) front-end and Field-Programmable Gate Array (FPGA) backend. The former introduces realistic impairments in the transmission chain such as carrier frequency and phase misalignments, quantization noise of multichannel ADC and DAC and non-linearities of RF components. It allows evaluating the performance of the precoded transmission in a more realistic environment rather than using only numerical simulations. We benchmark the performance of the communication standard in realistic channel scenarios, evaluate received signal SNR, and measure the actual channel throughput using LDPC codes

Greenstone: Un software libre de código abierto para la construcción de bibliotecas digitales. Experiencias en América Latina y el Caribe

UNESCO's Office in Montevideo releases a book on the use of Greenstone, open source digital library software, in Latin America. Entitled Greenstone: Un software libre de código abierto para la construcción de bibliotecas digitales. Experiencias en América Latina y el Caribe, the publication explains the multiple applications of Greenstone in the region and the work of national Greenstone’s centres

Chemico-biological characterization of Torpedino Di Fondi® tomato fruits. A comparison with San Marzano cultivar at two ripeness stages

Torpedino di Fondi (TF) is a hybrid tomato landrace developed in Sicily and recently introduced in the south Lazio area along with the classical San Marzano (SM) cultivar. The present study aimed at characterizing TF tomatoes at both pink and red ripening stages, and at comparing them with traditional SM tomatoes. A multidisciplinary approach consisting of morphological, chemical (FT‐ICR MS, NMR, HPLC, and spectrophotometric methods), and biological (antioxidant and antifungal in vitro activity) analyses was applied. Morphological analysis confirmed the mini‐ San Marzano nature and the peculiar crunchy and solid consistency of TF fruits. Pink TF tomatoes displayed the highest content of hydrophilic antioxidants, like total polyphenols (0.192 mg/g), tannins (0.013 mg/g), flavonoids (0.204 mg/g), and chlorophylls a (0.344 mg/g) and b (0.161 mg/g), whereas red TF fruits were characterized by the highest levels of fructose (3000 mg/100 g), glucose (2000 mg/100 g), tryptophan (2.7 mg/100 g), phenylalanine (13 mg/100 g), alanine (25 mg/100 g), and total tri‐unsaturated fatty acids (13% mol). Red SM fruits revealed the greatest content of lipophilic antioxidants, with 1234 mg/g of total carotenoids. In agreement with phenolics content, TF cultivar showed the greatest antioxidant activity. Lastly, red TF inhibited Candida species (albicans, glabrata and krusei) growth

Exciton bimolecular annihilation dynamics in supramolecular nanostructures of conjugated oligomers

We present femtosecond transient absorption measurements on $\pi$-conjugated supramolecular assemblies in a high pump fluence regime. Oligo(\emph{p}-phenylenevinylene) monofunctionalized with ureido-\emph{s}-triazine (MOPV) self-assembles into chiral stacks in dodecane solution below 75$^{\circ}$C at a concentration of $4\times 10^{-4}$ M. We observe exciton bimolecular annihilation in MOPV stacks at high excitation fluence, indicated by the fluence-dependent decay of $1^1$B$_{u}$-exciton spectral signatures, and by the sub-linear fluence dependence of time- and wavelength-integrated photoluminescence (PL) intensity. These two characteristics are much less pronounced in MOPV solution where the phase equilibrium is shifted significantly away from supramolecular assembly, slightly below the transition temperature. A mesoscopic rate-equation model is applied to extract the bimolecular annihilation rate constant from the excitation fluence dependence of transient absorption and PL signals. The results demonstrate that the bimolecular annihilation rate is very high with a square-root dependence in time. The exciton annihilation results from a combination of fast exciton diffusion and resonance energy transfer. The supramolecular nanostructures studied here have electronic properties that are intermediate between molecular aggregates and polymeric semiconductors

Carbon and nitrogen stable isotope compositions of organic matter in marine sediment cores from the Abrolhos region: indicators of sources and preservation

Organic matter is an important source of information on the transport and consolidation processes of sediments. In this study, the isotopes of carbon and nitrogen (δ13C and δ15N), total organic carbon (TOC), total nitrogen, carbon/nitrogen (C/N) ratio, and 13C-NMR were utilized to understand the origin and behavior of organic material in the Abrolhos region. It were analyzed nine sediment cores taken from a mangrove, a channel between the mainland and the coral reefs. The average value of the C/N ratio in the mangrove was 18, which characterizes purely terrigenous areas. For the reefs, the average value of the C/N ratio was 8,which is characteristic of marine and coastal regions. For the sediment cores taken from the channel, the average value of the C/N ratio was 10, a typical value of areas under the influence of mangroves. The mean values of δ13C were -26.9‰ for the mangrove, -20.7‰ for the channel region, and -18.2‰ for the reefs. This variation is associated with the main source of organic matter, which in the mangrove is derived from vascular plants (mainly C3 metabolism) and for the reefs is derived from phytoplankton. The 13C-NMR results corroborate the isotopic and elemental analyses. The analyses of these cores indicate that the anthropogenic influence on the coast did not significantly alter the composition of the material that has been deposited in about the last 80 years in the region of study.A matéria orgânica é uma fonte de informação importante nos processos\ud de transporte e consolidação de sedimentos. Neste estudo, foram utilizados\ud isótopos de carbono e de nitrogênio (δ13C e δ15N), carbono orgânico total\ud (TOC), nitrogênio total, razão carbono/nitrogênio (C/N) e 13C-NMR para\ud entender a origem e o comportamento do material orgânico na região de\ud Abrolhos. Foram analisados nove testemunhos de sedimentos coletados em\ud um manguezal, em um canal e em recifes de corais. O valor médio da razão\ud C/N no manguezal foi de 18, o que caracteriza áreas puramente terrígenas.\ud Nos recifes, esse valor foi de 8, característico de regiões marinhas e costeiras,\ud e, nos testemunhos de sedimentos coletados no canal, foi de 10, um valor\ud típico de áreas sob a influência de manguezais. O valor médio de δ13C foi de\ud -26,9‰ para o manguezal, -20,7‰ para a região do canal e -18,2‰ para os\ud recifes. Essa variação é associada com a principal fonte de matéria orgânicaa qual, no manguezal, é derivada de plantas vasculares (principalmente de\ud metabolismo C3) e, nos recifes, é derivada de fitoplâncton. Os resultados de\ud 13C-NMR corroboram as análises isotópicas e elementais. As análises dos\ud testemunhos indicam que a influência antropogênica da região costeira não\ud altera significantemente a composição do material que tem sido depositado\ud nos últimos 80 anos na região estudad