Genuine Multipartite Entanglement in Quantum Phase Transitions

We demonstrate that the Global Entanglement (GE) measure defined by Meyer and Wallach, J. Math. Phys. 43, 4273 (2002), is maximal at the critical point for the Ising chain in a transverse magnetic field. Our analysis is based on the equivalence of GE to the averaged linear entropy, allowing the understanding of multipartite entanglement (ME) features through a generalization of GE for bipartite blocks of qubits. Moreover, in contrast to GE, the proposed ME measure can distinguish three paradigmatic entangled states: $GHZ_{N}$, $W_{N}$, and $EPR^{\otimes N/2}$. As such the generalized measure can detect genuine ME and is maximal at the critical point.Comment: 4 pages, 3 figures. Replaced with final published versio

Chrysomya albiceps, novo agente de miíase cutânea secundária de ovinos no Brasil

A register, for the first time in Brazil, of the occurrence of secondary skin myiasis caused by Chrysomya albiceps in sheep.Registra-se, pela primeira vez no Brasil, a ocorrência de miíase cutânea secundária por Chrysomya albiceps (Wied.) em ovinos

Parasitismo por Pulex irritans em aves de postura

A register, for the first time in Rio Grande do Sul (Brazil), of the occurrence of Pulex irritans on laying hens.Registra-se, pela primeira vez no Rio Grande do Sul, o parasitismo de galinhas por Pulex irritans

Occurrence and population floatation of three species of Chrysomya

Registra-se, por primeira vez no Estado do Rio Grande do Sul, a ocorrência e a flutuação populacional dos seguintes dípteros (Diptera, Calliphoridae): Chrysomya albíceps ( Wied), Chrysomya chloropyga (Wied.) e Chrysomya megacephala (Fab.), possíveis agentes causadores de miíases cutâneas em animais domésticos.The occurrence and population floatation of the following dipterous (Diptera, Calliphoridae): Chrysomya albiceps (Wied.), Chrysomya chloropyga (Wied.) and Chrysomya megacephala (Fab.) are recorded by the first time in the State of Rio Grande do Sul (Brazil). These species are considered to be causal agents of cutaneous myiasis in domesticated animals

Atmospheric contaminations and bad conservation effects in Roman mosaics and mortars of Italica

The advanced microscopic (AM) analyses of mosaics and mortars from ancient construction have been studied for millennia in several Roman buildings in Europe. The geochemical characteristics of mosaics and mortars in Italica, Spain, were composed of amorphous and crystalline raw materials. Applied AM and X-ray diffraction (XRD) studies of different mosaics and mortars were carried out to observe the occurrence of natural and anthropogenic phases with organic and inorganic hazardous compounds. The results revealed a broad range of particles (micro-to nano-scale) including coarse (2.5–10 μm), fine (0.1–2.5 μm), and ultrafine ones (<0.1 μm), down to a few nanometers, as measured on electron microscope images. The particles occur typically in the form of aggregates, even in the ultrafine scale. Single, i.e., non-agglomerated particles are more common in the ultrafine fraction than at larger sizes. Geochemical studies of the samples showed that high proportions of aluminum, calcium, iron, potassium, silicon, and titanium yielded high standards of cementation manifestations. In addition, it was confirmed in this study that many of the mosaics blanketed by land remained unchanged; however, when the soil was removed, such mosaics began to undergo changes, mainly by weathering and atmospheric contamination. Several materials identified by XRD can also be detected using a highresolution transmission electron microscopy (H-TEM)/field emission scanning electron microscope (FE-SEM) and vice versa. The occurrence of minerals containing potential hazardous elements (PHEs) and several associated organic compounds due to the modification caused by moisture and pollution was also demonstrated. The results offered important information about the building materials that were used to meet the mechanical requirements of the buildings

Dissolving star cluster candidates

We present a list of 34 neglected entries from star cluster catalogues located at relatively high galactic latitudes ($|b| >$ 15$^{\circ}$) which appear to be candidate late stages of star cluster dynamical evolution. Although underpopulated with respect to usual open clusters, they still present a high number density contrast as compared to the galactic field. This was verified by means of (i) predicted model counts from different galactic subsystems in the same direction, and (ii) Guide Star Catalog equal solid angle counts for the object and surrounding fields. This suggests that the objects are physical systems, possibly star clusters in the process of disruption or their fossil remains. The sample will be useful for followup studies in view of verifying their physi cal nature.Comment: manuscript in LATEX with 7 pages, 7 figures .ps Accepted for Astronomy and Astrophysics main journa

Ants Sleep, Plants do not: The Variation in Species’ Activity Influences the Topology of Interaction Networks

The emergence of graph theory allowed using the complex network approach to aggregate detailed information about interactions between species. Although the use of the complex network approach has improved the understanding about community structuring, few aspects such as the temporal variation in the species’ activity pattern in the networks’ topology were explored so far. The current study used the ecological network approach to investigate ants interacting in the extrafloral nectary (EFN) of plants in order to test the hypothesis that the temporal variation in the foraging behavior of these animals affects the networks’ topology. In order to assess the temporal effect on the interaction networks, 24-hour collections divided in two 12-hour shifts (day and night) were performed in 20 plots, thus totaling 288 collection hours over 6 months. The ant-plant interaction networks presented similarity among the topological metrics assessed throughout the day. Different ant species presented distinct foraging times. Thus, two modules referring to the day and night shifts emerged from the network and presented specific species at each foraging shift. On the other hand, the plants kept on providing the resource (active EFNs) throughout the day. The results found in the current study have shown that ecological networks keep their structures constant; however, the ecological processes ruling these networks can better respond to the effects caused, for example, by the temporal variation in species’ activity. Therefore, it is worth always taking into consideration the importance of ecological processes at the time to analyze interactions in the nature

ColabSaber: A pedagogical support framework in the collaborative construction of knowledge / ColabSaber: Uma estrutura pedagógica de apoio na construção colaborativa do conhecimento

This paper proposes the ColabSaber Framework, which aims to change the traditional format of lecture-based classes with the use of the learning principles defended by Vygotsky, such as language, culture and social interaction. ColabSaber uses the fundamentals of Group Storytelling as educational support for elementary school students. This paper points out the importance of the collaborative construction of comic books as an intermediate support in the traditional teaching-learning process, also considering the technological advances and the ease of students in handling new technologies. As a result, the article concludes a significant improvement in the academic performance of the participating students and a motivational element of the academic engagement of the participating students

Environmental evaluation and nano-mineralogical study of fresh and unsaturated weathered coal fly ashes

Coal combustion and the disposal of combustion wastes emit enormous quantities of nano-sized particles that pose significant health concerns on exposure, particularly in unindustrialized countries. Samples of fresh and weathered class F fly ash were analysed through various techniques including X-ray fluorescence (XRF), X-ray diffraction (XRD), focused ion beam scanning electron microscopy (FIB-SEM), field-emission gun scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM) coupled with energy dispersive x-ray spectroscopy (EDS), and Raman Spectroscopy. The imaging techniques showed that the fresh and weathered coal fly ash nanoparticles (CFA-NPs) are mostly spherical shaped. The crystalline phases detected were quartz, mullite, ettringite, calcite, maghemite, hematite, gypsum, magnetite, clay residues, and sulphides. The most abundant crystalline phases were quartz mixed with Al-Fe-Si-K-Ti-O-amorphous phases whereas mullite was detected in several amorphous phases of Al, Fe, Ca, Si, O, K, Mg, Mn, and P. The analyses revealed that CFANPs are 5–500 nm in diameter and encapsulate several potentially hazardous elements (PHEs). The carbon species were detected as 5–50 nm carbon nanoballs of graphitic layers and massive fullerenes. Lastly, the aspects of health risks related to exposure to some detected ambient nanoparticles are also discussed

CA88, a nuclear repetitive DNA sequence identified in Schistosoma mansoni, aids in the genotyping of nine Schistosoma species of medical and veterinary importance

CA88 is the first long nuclear repetitive DNA sequence identified in the blood fluke, Schistosoma mansoni. The assembled S. mansoni sequence, which contains the CA88 repeat, has 8,887 nucleotides and at least three repeat units of approximately 360 bp. In addition, CA88 also possesses an internal CA microsatellite, identified as SmBr18. Both PCR and BLAST analysis have been used to analyse and confirm the CA88 sequence in other S. mansoni sequences in the public database. PCR-acquired nuclear repetitive DNA sequence profiles from nine Schistosoma species were used to classify this organism into four genotypes. Included among the nine species analysed were five sequences of both African and Asian lineages that are known to infect humans. Within these genotypes, three of them refer to recognised species groups. A panel of four microsatellite loci, including SmBr18 and three previously published loci, has been used to characterise the nine Schistosoma species. Each species has been identified and classified based on its CA88 DNA fingerprint profile. Furthermore, microsatellite sequences and intra-specific variation have also been observed within the nine Schistosoma species sequences. Taken together, these results support the use of these markers in studying the population dynamics of Schistosoma isolates from endemic areas and also provide new methods for investigating the relationships between different populations of parasites. In addition, these data also indicate that Schistosoma magrebowiei is not a sister taxon to Schistosoma mattheei, prompting a new designation to a basal clade.Universidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Imunologia e ParasitologiaInstituto de Pesquisas René Rachou-FiocruzThe Natural History Museum Department of ZoologySanta Casa de Belo Horizonte Programa de Pós-Graduação e PesquisaUniversidade Federal de Ouro Preto Escola de Farmácia Laboratório de Pesquisas ClínicasUNIFESP, EPM, Imunologia e ParasitologiaSciEL