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Sample records for strix varia presence

  1. Using detection dogs to conduct simultaneous surveys of northern spotted (Strix occidentalis caurina and barred owls (Strix varia.

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    Samuel K Wasser

    Full Text Available State and federal actions to conserve northern spotted owl (Strix occidentalis caurina habitat are largely initiated by establishing habitat occupancy. Northern spotted owl occupancy is typically assessed by eliciting their response to simulated conspecific vocalizations. However, proximity of barred owls (Strix varia-a significant threat to northern spotted owls-can suppress northern spotted owl responsiveness to vocalization surveys and hence their probability of detection. We developed a survey method to simultaneously detect both species that does not require vocalization. Detection dogs (Canis familiaris located owl pellets accumulated under roost sites, within search areas selected using habitat association maps. We compared success of detection dog surveys to vocalization surveys slightly modified from the U.S. Fish and Wildlife Service's Draft 2010 Survey Protocol. Seventeen 2 km × 2 km polygons were each surveyed multiple times in an area where northern spotted owls were known to nest prior to 1997 and barred owl density was thought to be low. Mitochondrial DNA was used to confirm species from pellets detected by dogs. Spotted owl and barred owl detection probabilities were significantly higher for dog than vocalization surveys. For spotted owls, this difference increased with number of site visits. Cumulative detection probabilities of northern spotted owls were 29% after session 1, 62% after session 2, and 87% after session 3 for dog surveys, compared to 25% after session 1, increasing to 59% by session 6 for vocalization surveys. Mean detection probability for barred owls was 20.1% for dog surveys and 7.3% for vocal surveys. Results suggest that detection dog surveys can complement vocalization surveys by providing a reliable method for establishing occupancy of both northern spotted and barred owl without requiring owl vocalization. This helps meet objectives of Recovery Actions 24 and 25 of the Revised Recovery Plan for the

  2. Determination of Gastrointestinal Transit Times in Barred Owls ( Strix varia ) by Contrast Fluoroscopy.

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    Doss, Grayson A; Williams, Jackie M; Mans, Christoph

    2017-06-01

    Contrast imaging studies are routinely performed in avian patients when an underlying abnormality of the gastrointestinal (GI) tract is suspected. Fluoroscopy offers several advantages over traditional radiography and can be performed in conscious animals with minimal stress and restraint. Although birds of prey are commonly encountered as patients, little is known about GI transit times and contrast imaging studies in these species, especially owls. Owls are commonly encountered in zoological, educational, and wildlife settings. In this study, 12 adult barred owls ( Strix varia ) were gavage fed a 30% weight-by-volume barium suspension (25 mL/kg body weight). Fluoroscopic exposures were recorded at 5, 15, 30, 60, 120, 180, 240, and 300 minutes after administration. Overall GI transit time and transit times of various GI organs were recorded. Median (interquartile range [IQR]) overall GI transit time was 60 minutes (IQR: 19-60 minutes) and ranged from 5-120 minutes. Ventricular and small intestinal contrast filling was rapid. Ventricular emptying was complete by a median of 60 minutes (IQR: 30-120 minutes; range: 30-240 minutes), whereas small intestinal emptying was not complete in 9/12 birds by 300 minutes. Median small intestinal contraction rate was 15 per minute (IQR: 13-16 minutes; range: 10-19 minutes). Median overall GI transit time in barred owls is more rapid than mean transit times reported for psittacine birds and red-tailed hawks ( Buteo jamaicensis ). Fluoroscopy is a safe, suitable method for investigating GI motility and transit in this species.

  3. Northern Spotted Owl (Strix occidentalis caurina) Genome: Divergence with the Barred Owl (Strix varia) and Characterization of Light-Associated Genes.

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    Hanna, Zachary R; Henderson, James B; Wall, Jeffrey D; Emerling, Christopher A; Fuchs, Jérôme; Runckel, Charles; Mindell, David P; Bowie, Rauri C K; DeRisi, Joseph L; Dumbacher, John P

    2017-10-01

    We report here the assembly of a northern spotted owl (Strix occidentalis caurina) genome. We generated Illumina paired-end sequence data at 90× coverage using nine libraries with insert lengths ranging from ∼250 to 9,600 nt and read lengths from 100 to 375 nt. The genome assembly is comprised of 8,108 scaffolds totaling 1.26 × 109 nt in length with an N50 length of 3.98 × 106 nt. We calculated the genome-wide fixation index (FST) of S. o. caurina with the closely related barred owl (Strix varia) as 0.819. We examined 19 genes that encode proteins with light-dependent functions in our genome assembly as well as in that of the barn owl (Tyto alba). We present genomic evidence for loss of three of these in S. o. caurina and four in T. alba. We suggest that most light-associated gene functions have been maintained in owls and their loss has not proceeded to the same extent as in other dim-light-adapted vertebrates. © The Author 2017. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

  4. Radiographic evaluation of perching-joint angles in cockatiels (Nymphicus hollandicus), Hispaniolan Amazon parrots (Amazona ventralis), and barred owls (Strix varia).

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    Bonin, Glen; Lauer, Susanne K; Guzman, David Sanchez-Migallon; Nevarez, Javier; Tully, Thomas N; Hosgood, Giselle; Gaschen, Lorrie

    2009-06-01

    Information on perching-joint angles in birds is limited. Joint immobilization in a physiologic perching angle has the potential to result more often in complete restoration of limb function. We evaluated perching-joint angles in 10 healthy cockatiels (Nymphicus hollandicus), 10 Hispaniolan Amazons (Amazona ventralis), and 9 barred owls (Strix varia) and determined intra- and interobserver variability for goniometric measurements in 2 different radiographic projections. Intra- and interobserver variation was less than 7% for all stifle and intertarsal joint measurements but frequently exceeded 10% for the hip-joint measurements. Hip, stifle, and intertarsal perching angles differed significantly among cockatiels, Hispaniolan Amazon parrots, and barred owls. The accuracy of measurements performed on straight lateral radiographic projections with superimposed limbs was not consistently superior to measurements on oblique projections with a slightly rotated pelvis. Stifle and intertarsal joint angles can be measured on radiographs by different observers with acceptable variability, but intra- and interobserver variability for hip-joint-angle measurements is higher.

  5. Varia

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    Genesis, La Rédaction de

    2013-01-01

    La section Varia s’ouvre sur une question de grande actualité : que devient la critique génétique à l’ère de l’écriture numérique, quand les précieuses traces manuscrites auront disparu ? En exploitant de récentes publications américaines et allemandes, Jean-Louis Lebrave montre que, contrairement à toutes les craintes et grâce aux méthodes de l’informatique légale (« computer forensics »), la critique génétique a de beaux jours devant elle. Suit une présentation de la critique génétique en A...

  6. Comparative food niche analysis of Strix Owls in Belarus

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    Alexey K. Tishechkin

    1997-01-01

    Three Strix species breed sympatrically in Belarus. The Tawny Owl (Strix aluco) is one of two commonest owl species in the country, and is distributed throughout the whole territory. Its' range overlaps widely with two other species, the Ural Owl (S. uralensis) which is common in the forests of the northern part and the Great...

  7. Registro del búho leonado Strix fulvescens en el estado de Oaxaca, México Record of the Fulvous Owl Strix fulvescens in the state of Oaxaca, Mexico

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    Ricarda Ramírez-Julián

    2011-06-01

    Full Text Available Mediante comparaciones acústicas y espectrográficas del búho leonado Strix fulvescens, se determinó su presencia en el noroeste de la sierra Norte de Oaxaca. Este registro constituye la confirmación de su presencia en el estado; amplía 350 km aproximadamente su distribución hacia el noroeste y aumenta a 21 las especies de búhos registradas en Oaxaca.The occurrence of Fulvous Owl Strix fulvescens in the northwestern portion of the Sierra Norte of Oaxaca was determined using aural and spectrographic comparison. This record confirms the presence of Fulvous Owl in the state of Oaxaca, expanding its distribution range to the northwest by about 350 Km, and increasing to 21 species the number of owls recorded in Oaxaca.

  8. Blood parasites in Owls with conservation implications for the Spotted Owl (Strix occidentalis)

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    Ishak, H.D.; Dumbacher, J.P.; Anderson, N.L.; Keane, J.J.; Valkiunas, G.; Haig, S.M.; Tell, L.A.; Sehgal, R.N.M.

    2008-01-01

    The three subspecies of Spotted Owl (Northern, Strix occidentalis courina; California, S. o. occidentalis; and Mexican, S. o. lucida) are all threatened by habitat loss and range expansion of the Barred Owl (S. varia). An unaddressed threat is whether Barred Owls could be a source of novel strains of disease such as avian malaria (Plasmodium spp.) or other blood parasites potentially harmful for Spotted Owls. Although Barred Owls commonly harbor Plasmodium infections, these parasites have not been documented in the Spotted Owl. We screened 111 Spotted Owls, 44 Barred Owls, and 387 owls of nine other species for haemosporidian parasites (Leucocytozoon, Plasmodium, and Haemoproteus spp.). California Spotted Owls had the greatest number of simultaneous multi-species infections (44%). Additionally, sequencing results revealed that the Northern and California Spotted Owl subspecies together had the highest number of Leucocytozoon parasite lineages (n=17) and unique lineages (n=12). This high level of sequence diversity is significant because only one leucocytozoon species (L. danilewskyi) has been accepted as valid among all owls, suggesting that L. danilewskyi is a cryptic species. Furthermore, a Plasmodium parasite was documented in a Northern Spotted Owl for the first time. West Coast Barred Owls had a lower prevalence of infection (15%) when compared to sympatric Spotted Owls (S. o. caurina 52%, S. o. occidentalis 79%) and Barred Owls from the historic range (61%). Consequently, Barred Owls on the West Coast may have a competitive advantage over the potentially immune compromised Spotted Owls. ?? 2008 Ishak et al.

  9. Varia

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    Albera, François; Albera, François; Albera, François; Albera, François; Albera, François; Boillat, Alain; Bretèque, François Amy de la; Bullot, Erik; Cosandey, Roland; Forestier, Laurent Le; Forestier, Laurent Le; Gili, Jean Antoine; Gili, Jean Antoine; Gili, Jean Antoine; Jaques, Pierre-Emmanuel

    2013-01-01

    Le volume associe réflexion théorique et méthodologique et la publication d'études originales découvrant des pans méconnus de l'histoire du cinéma. La partie « Point de vue » est consacrée à l'ouvrage d'Antoine de Baecque paru chez Gallimard. L'auteur répond aux questions de plusieurs rédacteurs de la revue à propos de sa proposition de repérer des « formes cinématographiques historiques » dans les films ouvrant à une compréhension des phénomènes majeurs du 20e siècle (génocide, effondrement ...

  10. Presence

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    Pamela Renee Boeck

    2014-03-01

    Full Text Available Healthy therapeutic relationships enhance wholeness and healing; they are the key to effective health promotion. Therapeutic nursing presence demonstrates caring, empathy, and connection, qualities required to build rapport and trust between nurse and patient. This concept analysis’ purpose was to illuminate the various forms of the meanings of presence and the value placed on them. The science of nursing often precedes the art and spirituality of nursing. This is due to focusing primarily on the high acuity of the patients being seen in conjunction with shortage of personnel and resources. Patient dissatisfaction continues to be a growing concern. The nursing shortage crisis continues along with more nurses experiencing moral distress, compassion fatigue, and/or burnout. In nurses’ haste to complete their duties, are we facing the risk of overlooking one of the original gifts of the nursing profession? This would be the gift of genuine presence. This concept analysis aims to identify the attributes that are essential to the concept of presence, and to clarify its nursing usage, by following the strategy suggested by Walker and Avant. It is important to reflect on various ways of providing presence in the clinical setting. By exploring the spiritual, literary, psychological, and nursing literature, there is a diverse yet similar interconnectivity of what presence may represent. Observations and experiences of a range of sensatory and kinesthetic perceptions are revealed to ascertain the attributes discerning commonalities and themes of presence. Nursing presence is considered to be an essential state of holistic nursing as well as a core competency in contemporary nursing. Clarifying the significance of presence in nursing invites the prospect of additional evidence-based research that may place the intrinsic value of presence as a continuing theoretical foundation.

  11. Albinism in the Great Gray Owl (Strix nebulosa) and other owls

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    Pentti Alaja; Heimo Mikkola

    1997-01-01

    An incomplete albino Great Gray Owl (Strix nebulosa) was observed in Vesanto and Kajaani, Finland, 1994-1995. The literature pertaining to albinism in owls indicates that total and incomplete albinism has only been reported in 13 different owl species, the Great Gray Owl being the only species with more than five records. Thus six to seven incomplete...

  12. Estimation of food consumption from pellets cast by captive Ural Owls (Strix uralensis)

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    Aki Higuchi; Manabu T. Abe

    1997-01-01

    There is considerable data in the literature on the diet of the Ural Owl (Strix uralensis) based on pellet analysis. Though it is possible to identify prey items by this method, the volume of food consumption is still unknown. The population of Ural Owls in Japan is declining due to the reduction of old-growth forest and the concurrent loss of...

  13. Abundance and population characteristics of Northern Spotted Owls (Strix occidentalis caurina) in Olympic National Park, Washington

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    D. Erran Seaman

    1997-01-01

    We monitored the threatened Northern Spotted Owl (Strix occidentalis caurina) in Olympic National Park from 1992 through 1996. We used a stratified random sampling scheme to survey 35 plots totaling 236 km?, approximately 10 percent of the forested area of the park.

  14. Genetic diversity within lichen photobionts of the Lecanora varia group (Lichenes, Ascomycota)

    DEFF Research Database (Denmark)

    Pérez-Ortega, S.; Søchting, Ulrik; Printzen, C.

    partner of the symbiosis. Meanwhile, knowledge about photobiont diversity and the degree of photobiont selectivity of the fungus have been lacking behind. The Lecanora varia group is a set of species within the genus Lecanora defined by the presence of an amphitecial cortex along with the presence...... of usnic acid as secondary metabolite. We have focused on a small group of three species, namely L. varia, L. burgaziae, and L. densa which share very similar anatomical and morphological characters and an identical chemistry, with psoromic and 2-O-demethylpsoromic acids in addition to usnic acid. We have...... collected populations of these three species from various localities within their distributional range: L varia (Spain, Austria, Sweden, Czech Republic, western Siberia); L. burgaziae (Spain) and L. densa (North America and Spain). Subsequently, we sequenced the internal transcribed spacer (ITS) region...

  15. Great gray owls (Strix nebulosa) in Yosemite National Park: on the importance of food, forest structure, and human disturbance

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    van Riper, Charles; Fontaine, Joseph J.; van Wagtendonk, Jan W.

    2013-01-01

    We studied great gray owls (Strix nebulosa Forster) in Yosemite National Park, California, measuring variables that could potentially influence patterns of occurrence and conservation of this stateendangered species. We found that owl presence was closely tied to habitat (red fir (Abies magnified A. Murray) and the abundance of meadows), prey, and snags across the landscape. We also found that indicators of human recreational activities negatively influenced owl distribution and habitat use. Great gray owls appear to prefer mid-elevation red fir forest with meadows that are drier and more productive in terms of small mammal populations. That these areas also have the highest human activity presents a paradox, both for individual owls and for the future conservation and management of this California endangered species. The extent to which human recreation in natural areas affects animal behavior, species distribution, and productivity is a growing issue in natural area management. We present information that will allow land managers to better understand how existing natural resources, coupled with human recreation, influence the distribution and habitat use of the great gray owl.

  16. Food habits of the Northern Spotted Owl (Strix occidentalis caurina) at six nest sites in Washington?s east Cascades

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    Kenneth R. Bevis; Jo Ellen Richards; Gina M. King; Eric E. Hanson

    1997-01-01

    This paper reports on 245 pellet samples containing 479 identified prey items collected at six Northern Spotted Owl (Strix occidentalis caurina) breeding sites in the eastern portion of its range. The majority of prey (biomass) came from four species; northern flying squirrels (Glaucomys sabrinus), bushy-tailed woodrats (...

  17. Age-dependent diet change, parental care and reproductive costin tawny owls Strix aluco

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    Sasvári, Lajos; Hegyi, Zoltán; Csörgõ, Tibor; Hahn, István

    2000-07-01

    Tawny owls Strix aluco breeding in nest-boxes were studied in a mixed oak/hornbeam/beech forest located in the Duna-Ipoly National Park 30 km north-west of Budapest, Hungary, during the period 1992-1999. Diet composition, prey mass, breeding performance and body mass of the parents of known age were recorded. Older males had a greater ability to choose alternate prey, delivered a greater mass of prey with a higher feeding frequency and achieved higher productivity than younger males when the availability of the preferred prey declined. The reproductive cost was paid only by young parents. We suggest that the lowest breeding performance, which was observed with young parents in adverse weather conditions, may be due to both the lower ability of these younger birds to exploit alternative prey and to their poor body condition which resulted in them providing fewer resources to their offspring because of their need to provide for their own survival.

  18. Temperature variation in pulp chamber during dental bleaching in presence or absence of light activation = Variação da temperatura na câmara pulpar durante o clareamento dental na presença ou ausência de fotoativação

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    Mollica, Fernanda Brandão

    2010-01-01

    Full Text Available Objetivo: Além da agressão química devido à penetração dos géis clareadores na polpa durante o clareamento de dentes com vitalidade pulpar, outro possível fator agressor pode ser o calor gerado pela reação de oxidação exotérmica do gel clareador, que pode também ser agravada pela fotoativação. Este estudo avaliou a variação da temperatura na câmara pulpar de dentes humanos, utilizando-se três diferentes géis clareadores, com ou sem fotoativação. Metodologia: Trinta pré-molares humanos foram cortados longitudinalmente para obtenção de duas metades: vestibular e lingual. Os 60 espécimes foram divididos em 3 grupos e os agentes clareadores utilizados variaram como segue: peróxido de hidrogênio 35% (WHP, peróxido de carbamida 37% (W e peróxido de hidrogênio 38% (OX. Metade dos espécimes foi submetida ao clareamento com fotoativação e, a outra metade, sem fotoativação. A fonte de luz utilizada foi o aparelho à base de diodo emissor de luz (LED, 3-Light, Clean Line e as temperaturas foram medidas por um termômetro digital. Os dados foram analisados por análise de variância e teste de Tukey (alfa=5%. Resultados: Os resultados de temperatura foram: sem fotoativação (WHP= 0. 68b; W= 0. 40b; OX= 0. 48b; com fotoativação (WHP= 2. 35a; W= 1. 60a; OX= 1. 80a. Conclusão: A fotoativação dos géis clareadores com LED contribuiu para um maior aumento de temperatura na câmara pulpar, mas não se atingiu a temperatura crítica de 5,5oC

  19. California Spotted Owl (Strix occidentalis occidentalis) habitat use patterns in a burned landscape

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    Eyes, Stephanie; Roberts, Susan L.; Johnson, Matthew D.

    2017-01-01

    Fire is a dynamic ecosystem process of mixed-conifer forests of the Sierra Nevada, but there is limited scientific information addressing wildlife habitat use in burned landscapes. Recent studies have presented contradictory information regarding the effects of stand-replacing wildfires on Spotted Owls (Strix occidentalis) and their habitat. While fire promotes heterogeneous forest landscapes shown to be favored by owls, high severity fire may create large canopy gaps that can fragment the closed-canopy habitat preferred by Spotted Owls. We used radio-telemetry to determine whether foraging California Spotted Owls (S. o. occidentalis) in Yosemite National Park, California, USA, showed selection for particular fire severity patch types within their home ranges. Our results suggested that Spotted Owls exhibited strong habitat selection within their home ranges for locations near the roost and edge habitats, and weak selection for lower fire severity patch types. Although owls selected high contrast edges with greater relative probabilities than low contrast edges, we did not detect a statistical difference between these probabilities. Protecting forests from stand-replacing fires via mechanical thinning or prescribed fire is a priority for management agencies, and our results suggest that fires of low to moderate severity can create habitat conditions within California Spotted Owls' home ranges that are favored for foraging.

  20. Diet of the Tawny Owl Strix aluco in the area of Slovenske gorice (NE Slovenia

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    Janžekovič Franc

    2017-11-01

    Full Text Available The diet of Tawny Owl Strix aluco was studied in the area of Slovenske gorice - NE Slovenia. The analysis was carried out by examining pellets collected at ten locations in the period from 1984 to 2015. From the pellets, 2,121 prey units were isolated. The predominant prey were mammals (Mammalia, 84.8%, followed by birds (Aves, 8.3%, insects (Insecta, 4.7%, frogs (Anura, 1.6% and earthworms (Oligochaeta, 0.5%. Four orders of mammals were found: rodents (Rodentia, insectivores (Insectivora, bats (Chiroptera and carnivores (Carnivora. The most frequent prey in the owls’ diet were voles (Arvicolinae, 46.6% and mice (Murinae, 28.8%, while the number of shrews (Soricidae was low (4.5%. The obtained results are in concordance with the conclusions of other studies. In the area of Slovenske gorice, the Tawny Owl is an opportunistic predator of small mammals with an emphasis on voles and mice. Prey frequencies differ significantly among some localities. Variability in proportions of prey species among localities can also be the result of sampling carried out in different seasons and variability in the population dynamics of small mammals among years. Challenges for future research are to describe seasonal variability of the diet and to evaluate interspecific competition within the guild of night predators of small mammals: Tawny Owl, Long-eared Owl Asio otus, and Barn Owl Tyto alba, which are sympatric in this area.

  1. Avian trichomonosis in spotted owls (Strix occidentalis: Indication of opportunistic spillover from prey

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    Krysta H. Rogers

    2016-12-01

    Full Text Available Avian trichomonosis, caused by the flagellated protozoan parasite Trichomonas gallinae, has variable pathogenicity among bird species ranging from asymptomatic infections to severe disease periodically manifesting in epidemic mortality. Traditionally, columbids are identified as highly susceptible to infection with occasional spillover into raptors that prey on infected birds. We identified avian trichomonosis in two dead California spotted owls (Strix occidentalis occidentalis and three dead northern spotted owls (S. o. caurina in California during 2011–2015; infection was confirmed in four owls by PCR. Pathologic lesions associated with trichomonosis in the owls included caseonecrotic lesions of the upper palate accompanied by oropharyngitis, cellulitis, myositis, and/or sinusitis. Spotted owls are known to mainly feed on small mammals; therefore, the source of infection as well as the significance of the disease in spotted owls is unclear. These owl trichomonosis cases coincided temporally and spatially with three trichomonosis epidemics in band-tailed pigeons (Patagioenas fasciata monilis. The same parasite, T. gallinae subtype A2, was isolated from the spotted owls and band-tailed pigeons, suggesting the owls became infected when opportunistically feeding on pigeons during mortality events. Avian trichomonosis is an important factor in the decline of the Pacific Coast band-tailed pigeon population with near-annual mortality events during the last 10 years and could have conservation implications for raptor species at risk, particularly those that are facing multiple threats.

  2. A telemetry study of the social organization of a tawny owl (Strix aluco) population

    DEFF Research Database (Denmark)

    Sunde, Peter; Bølstad, Mikkel S.

    2004-01-01

    The spatial dispersion and social interactions were studied in 11 neighbouring pairs of radio-tagged tawny owls Strix aluco in a deciduous wood in Denmark from 1998-2001. The numbers and shapes of territories were stable throughout the survey and similar to a mapping made 40 years earlier. The home...... involving one owl only from each pair. The dispute rate between neighbouring pairs correlated positively with home-range overlap. The total annual mortality was 21% (95% CI: 6-33%). Dead owners were usually replaced within 1-2 months. Two out of four cases of radio-tagged owls disappearing from...

  3. Interpolaci??n por recurrencia en varias variables

    OpenAIRE

    L??pez Carmona, Antonio

    1981-01-01

    Se hace un estudio a fondo de la interpolaci??n por recurrencia bajo una formulaci??n algebraica muy general que deja a las conocidas f??rmulas de interpolaci??n de Lagrange Newton Aitken y Neville como casos particulares de esta formulaci??n. Todos los resultados obtenidos los aplicamos a la interpolaci??n en varias variables de la que hacemos un importante estudio

  4. Interpolación por recurrencia en varias variables

    OpenAIRE

    López Carmona, Antonio

    2013-01-01

    Se hace un estudio a fondo de la interpolación por recurrencia bajo una formulación algebraica muy general que deja a las conocidas fórmulas de interpolación de Lagrange Newton Aitken y Neville como casos particulares de esta formulación. Todos los resultados obtenidos los aplicamos a la interpolación en varias variables de la que hacemos un importante estudio

  5. Influence of primary prey on home-range size and habitat-use patterns of northern spotted owls (Strix occidentalis caurina)

    Science.gov (United States)

    Cynthia J. Zabel; Kevin S. McKelvey; James P. Ward

    1995-01-01

    Correlations between the home-range size of northern spotted owls (Strix occidentalis caurina) and proportion of their range in old-growth forest have been reported, but there are few data on the relationship between their home-range size and prey. The primary prey of spotted owls are wood rats and northern flying squirrels (Glaucomys sabrinus). Wood...

  6. Meta-analysis of California Spotted Owl (Strix occidentalis occidentalis) territory occupancy in the Sierra Nevada: habitat associations and their implications for forest management

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    Douglas J. Tempel; John J. Keane; R. J. Gutierrez; Jared D. Wolfe; Gavin M. Jones; Alexander Koltunov; Carlos M. Ramirez; William J. Berigan; Claire V. Gallagher; Thomas E. Munton; Paula A. Shaklee; Sheila A. Whitmore; M. Zachariah Peery

    2016-01-01

    We assessed the occupancy dynamics of 275 California Spotted Owl (Strix occidentalis occidentalis) territories in 4 study areas in the Sierra Nevada, California, USA, from 1993 to 2011. We used Landsat data to develop maps of canopy cover for each study area, which we then used to quantify annual territory-specific habitat...

  7. Clutch size variation in Tawny Owls (Strix aluco) from adjacent valley systems: can this be used as a surrogate to investigate temporal and spatial variations in vole density?

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    Steve J. Petty; Billy L. Fawkes

    1997-01-01

    Research on Tawny Owls (Strix aluco) in Kielder Forest, northern England, since 1981 demonstrated that field voles (Microtus agrestis) were their most important food. Here, field voles exhibited a 3-4 year cycle of abundance, and mean clutch size in Tawny Owls was significantly related to vole abundance in March. In this analysis...

  8. Tawny owl (Strix aluco) as a potential transmitter of Enterobacteriaceae epidemiologically relevant for forest service workers, nature protection service and ornithologists.

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    Grzywaczewski, Grzegorz; Kowalczyk-Pecka, Danuta; Cios, Szymon; Bojar, Wiktor; Jankuszew, Andrzej; Bojar, Hubert; Kolejko, Marcin

    2017-03-31

    Established taxa within the Enterobacteriaceae wereisolated from cloacal swabs of Strix aluco chicks in nest boxes located at five research sites. ChromID ESBL medium (bioMerieux) was used to select a pool of Enterobacteriaceae strains producing extended-spectrum beta-lactamases. Drug sensitivity of the chosen strains was determined from the full pool of Enterobacteriaceae to 6 chemotherapeutics of different mechanisms of action. The study evaluated the sensitivity of ESBL-synthesizing isolates to substances belonging to penicillins, cephalosporins, cephamycins, clavams, carbapenems and monobactams. Analysis of the results indicated a potential role of Strix aluco in the dissemination of epidemiologically-relevant Enterobacteriaceae, and, importantly, pose health risks to forest service workers, nature protection service and ornithologists. The results can also serve as the basis for further environmental studies.

  9. Relative effects of road risk, habitat suitability, and connectivity on wildlife roadkills: the case of tawny owls (Strix aluco).

    Science.gov (United States)

    Santos, Sara M; Lourenço, Rui; Mira, António; Beja, Pedro

    2013-01-01

    Despite its importance for reducing wildlife-vehicle collisions, there is still incomplete understanding of factors responsible for high road mortality. In particular, few empirical studies examined the idea that spatial variation in roadkills is influenced by a complex interplay between road-related factors, and species-specific habitat quality and landscape connectivity. In this study we addressed this issue, using a 7-year dataset of tawny owl (Strix aluco) roadkills recorded along 37 km of road in southern Portugal. We used a multi-species roadkill index as a surrogate of intrinsic road risk, and we used a Maxent distribution model to estimate habitat suitability. Landscape connectivity was estimated from least-cost paths between tawny owl territories, using habitat suitability as a resistance surface. We defined 10 alternative scenarios to compute connectivity, based on variation in potential movement patterns according to territory quality and dispersal distance thresholds. Hierarchical partitioning of a regression model indicated that independent variation in tawny owl roadkills was explained primarily by the roadkill index (70.5%) and, to a much lesser extent, by landscape connectivity (26.2%), while habitat suitability had minor effects (3.3%). Analysis of connectivity scenarios suggested that owl roadkills were primarily related to short range movements (habitat quality and landscape connectivity are globally high for the study species. Nevertheless, the study supported the view that functional connectivity should be incorporated whenever possible in roadkill models, as it may greatly increase their power to predict the location of roadkill hotspots.

  10. EXPLORATORY PLASMA BIOCHEMISTRY REFERENCE INTERVALS FOR URAL OWLS (STRIX URALENSIS, PALLAS 1771) FROM THE AUSTRIAN REINTRODUCTION PROJECT.

    Science.gov (United States)

    Scope, Alexandra; Schwendenwein, Ilse; Stanclova, Gabriela; Vobornik, Angela; Zink, Richard

    2016-06-01

    The Ural owl (Strix uralensis) is the biggest forest-living owl in Austria; however, it became extinct in Austria through poaching and habitat loss more than half a century ago. The birds examined in the present study were breeding pairs from the reintroduction project with the aim of determining exploratory plasma biochemistry reference intervals in Ural owls and evaluating the amount of biological variation between seasons, sexes, and ages. A total of 45 birds were sampled, including 13 adult males, 14 adult females, and 18 juvenile birds. Remarkably, almost all of the analytes showed significant differences between the subgroups, primarily between seasons, followed by age and sex. Only creatinkinase, glucose, lactatdehydrogenase, and triglycerides did not show any significant variations. Despite partitioning of reference values into subgroups according to biological variation diminishing the number of reference individuals in the respective groups, the resulting smaller reference intervals will improve medical assessment. The results of the present study once again demonstrate that significant seasonal fluctuations must be expected and considered in the interpretation. It can be assumed that these differences are probably even greater in free-range birds with considerable changes in food quantity and quality during and between years.

  11. Conservation of ParaHox genes' function in patterning of the digestive tract of the marine gastropod Gibbula varia

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    Steiner Gerhard

    2010-07-01

    Full Text Available Abstract Background Presence of all three ParaHox genes has been described in deuterostomes and lophotrochozoans, but to date one of these three genes, Xlox has not been reported from any ecdysozoan taxa and both Xlox and Gsx are absent in nematodes. There is evidence that the ParaHox genes were ancestrally a single chromosomal cluster. Colinear expression of the ParaHox genes in anterior, middle, and posterior tissues of several species studied so far suggest that these genes may be responsible for axial patterning of the digestive tract. So far, there are no data on expression of these genes in molluscs. Results We isolated the complete coding sequences of the three Gibbula varia ParaHox genes, and then tested their expression in larval and postlarval development. In Gibbula varia, the ParaHox genes participate in patterning of the digestive tract and are expressed in some cells of the neuroectoderm. The expression of these genes coincides with the gradual formation of the gut in the larva. Gva-Gsx patterns potential neural precursors of cerebral ganglia as well as of the apical sensory organ. During larval development this gene is involved in the formation of the mouth and during postlarval development it is expressed in the precursor cells involved in secretion of the radula, the odontoblasts. Gva-Xolx and Gva-Cdx are involved in gut patterning in the middle and posterior parts of digestive tract, respectively. Both genes are expressed in some ventral neuroectodermal cells; however the expression of Gva-Cdx fades in later larval stages while the expression of Gva-Xolx in these cells persists. Conclusions In Gibbula varia the ParaHox genes are expressed during anterior-posterior patterning of the digestive system. This colinearity is not easy to spot during early larval stages because the differentiated endothelial cells within the yolk permanently migrate to their destinations in the gut. After torsion, Gsx patterns the mouth and foregut

  12. Varia. (Miscellany).

    Science.gov (United States)

    Matthey, Marinette

    1996-01-01

    This collection of diverse research papers in linguistics includes: "La notion de tour de parole dans une perspective syntaxique" ("The Notion of Turn Taking from a Syntactic Perspective") (Jean-Marc Luscher, Sandrine Piaget, Christian Rubattel); "'Si tu me fais honneur d'un p'tit telephone demain matin ben je suis…

  13. ANALISIS PENETAPAN HARGA JUAL BERDASARKAN TARGET COSTING PADA PT VARIA USAHA BETON PLANT BM MAKASSAR

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    ASHAR MUNTA

    2017-05-01

    The Results showed there are differences in the price of Paving Blocks namely (1 in 2012 the difference between the price of Rp 25.70. (2 In 2013 the price difference Rp 3,31. And (3 In 2014 the difference between the price of Rp 1,37. Which means that the Target Costing Method is better than the Conventional Method in PT Varia Usaha Beton Plant BM Makassar.

  14. Variações no posicionamento dos eixos visuais em pacientes submetidos a cirurgias de estrabismo

    Directory of Open Access Journals (Sweden)

    Graciela Scalco Brum

    2011-02-01

    Full Text Available OBJETIVOS: Determinar as variações no ângulo de posicionamento ocular pós-operatório em pacientes submetidos a cirurgias para correção de estrabismo e identificar possíveis fatores de risco associados a tal ocorrência. MÉTODOS: Foi realizado estudo retrospectivo de 819 pacientes portadores de estrabismo submetidos à cirurgia para correção do desvio ocular entre janeiro de 1995 e dezembro de 2005 no Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo. Os pacientes foram divididos em quatro grupos quanto ao tipo de desvio pré-operatório (esotropia alternante, esotropia monocular, exotropia alternante e exotropia monocular e as variações no posicionamento ocular foram quantificadas em cada grupo. RESULTADOS: A prevalência de variações no posicionamento ocular (pós-operatório maiores que 10∆ entre o total de pacientes estudado foi de 33,5% (274 pacientes. Entre estes, foi verificada maior frequência de desvios no sentido exotrópico (178 pacientes ou 65,0% do que no sentido esotrópico (96 pacientes ou 35,0%, diferença esta que foi estatisticamente significativa (teste do qui-quadrado; p<0,001. CONCLUSÕES: Instabilidade no posicionamento ocular pode ocorrer ao longo do tempo em pacientes submetidos a cirurgias de estrabismo. Tal ocorrência reforça a necessidade do desenvolvimento de alternativas terapêuticas a fim de proporcionar maior estabilidade ao sistema oculomotor no pós-operatório de cirurgias de estrabismo.

  15. Variação anatômica no lenho de Astronium lecointei Ducke

    Directory of Open Access Journals (Sweden)

    Luiz Eduardo de Lima Melo

    Full Text Available Com o objetivo de avaliar a variação dos elementos celulares de Astronium lecointei Ducke no sentido medula-câmbio, analisaram-se amostras de madeira de três regiões radiais da árvore, a 1,30 m do solo: 0% (próximo à medula, 50% (região intermediária e 100% (próximo ao câmbio vascular. A metodologia aplicada no trabalho foi aquela tradicionalmente recomendada para estudos em anatomia de madeira, seguindo orientação do IAWA Committee. Observou-se que alguns elementos anatômicos apresentaram tendências de variação definidas e estatisticamente significativas: frequência, diâmetro e comprimento dos elementos de vaso, altura dos raios em micrômetros e comprimento das fibras. Observou-se também maior obstrução dos poros por tilas próximo à medula e na região intermediária. A tendência de estabilização das dimensões dessas estruturas pode estar indicando a formação de madeira adulta a partir da região intermediária analisada no lenho da espécie.

  16. [Effects of exogenous salicylic acid on seed germination and physiological characteristics of Coronilla varia under drought stress.

    Science.gov (United States)

    Ma, Le Yuan; Chen, Nian Lai; Han, Guo Jun; Li, Liang

    2017-10-01

    This research investigated the effects of different concentrations (0, 0.5, 1.0, 2.0 mmol·L -1 ) of salicylic acid on the seed germination and physiological characteristics of legume forage Coronilla varia (cultivar 'Lvbaoshi') under PEG-6000 (concentration 8% and 12%) simulated drought stress. The results showed that under drought stress, 0.5-1.0 mmol·L -1 salicylic acid significantly increased germination percentage, germination vigour, germination index, vitality index and bud length of C. varia. Under the stress of 12% PEG, the dry mass of C. varia seedlings processed by 1.0 mmol·L -1 salicylic acid was significantly higher than that under drought stress. 0.5-1.0 mmol·L -1 salicylic acid processing significantly increased proline, soluble protein content, the activities of catalase, peroxidase and superoxide dismutase of C. varia seedlings under drought stress, but cell electrolyte permeability, H2O2 content and O2 - · production rate of seedlings were significantly decreased. 1.0 mmol·L -1 salicylic acid produced the best results. When the concentration of salicylic acid was beyond 2.0 mmol·L -1 , no mitigation effect was observed on the seed germination and growth of seedlings under drought stress. It was concluded that salicylic acid at appropriate concentrations could effectively improve osmotic regulation, antioxidation and mitigate the damage of drought stress so as to promote the growth of C. varia seedlings.

  17. Contabilização das variações da necessidade de capital de giro

    Directory of Open Access Journals (Sweden)

    André Seidel

    2003-04-01

    Full Text Available Quando se deseja iniciar uma atividade ou mesmo expandi-la, muito se analisa a necessidade de aplicações em ativos permanentes, mas pouca atenção é dedicada ao "investimento em clientes e estoques". Dessa forma a concessão de prazo para clientes ou a opção por um aumento nos níveis dos estoques, ambos valores contabilizados no ativo circulante, pode significar uma decisão de investimento tão ou mais duradoura do que aquela efetuada em ativos permanentes. A Necessidade de Capital de Giro (NCG, e suas variações, podem levar à falência muitas empresas, principalmente pequenas e médias. Além da preocupação monetária, uma empresa necessita garantir a manutenção de sua estrutura física, permanente e operacional, necessária para suas atividades. O lucro contabilizado através do Custo Corrente Corrigido (CCC, precisa de ajustes para ser considerado totalmente distribuível; sob nosso ponto de vista, as variações da NCG fazem parte desses ajustes. A idéia central deste artigo é a criação de uma Reserva de Capital denominada Reserva das Variações da Necessidade de Capital de Giro (RVNCG como forma de garantir a manutenção do capital físico da empresa, ajustando o lucro passível de distribuição através da contabilização das variações da NCG. Esse artigo está dividido em quatro partes. Na primeira, percorremos o embasamento teórico. No desenvolvimento, segunda parte, traçamos os objetivos, as premissas e descrevemos a criação e a contabilização da RVNCG. Na terceira parte, demonstramos a proposta do artigo através de três exemplos numéricos com os respectivos Balanços Patrimoniais e Demonstrações do Resultado, mostrando a utilização proposta da RVNCG; por fim, na quarta e última parte apresentamos nossas conclusões.When we want to begin or expand an activity, the need to invest in permanent assets is profoundly analyzed, but little attention is given to the investment in clients and inventories

  18. Comparison of PFASs contamination in the freshwater and terrestrial environments by analysis of eggs from osprey (Pandion haliaetus), tawny owl (Strix aluco), and common kestrel (Falco tinnunculus)

    Energy Technology Data Exchange (ETDEWEB)

    Eriksson, Ulrika, E-mail: ulrika.eriksson@oru.se [Man-Technology-Environment (MTM) Research Centre, School of Science and Technology, Örebro University, SE-701 82 Örebro (Sweden); Roos, Anna; Lind, Ylva [Swedish Museum of Natural History, P.O. Box 50007, SE-104 05 Stockholm (Sweden); Hope, Kjell; Ekblad, Alf; Kärrman, Anna [Man-Technology-Environment (MTM) Research Centre, School of Science and Technology, Örebro University, SE-701 82 Örebro (Sweden)

    2016-08-15

    The level of PFAS (per- and polyfluorinated alkyl substances) contamination in freshwater and terrestrial Swedish environments in 2013/2014 was assessed by analyzing a range of perfluorinated alkyl acids, fluorotelomer acids, sulfonamides, sulfonamidoethanols and polyfluoralkyl phosphate diesters (diPAPs) in predator bird eggs. Stable isotopes ({sup 13}C and {sup 15}N) were analyzed to elucidate the dietary source. The tawny owl (Strix aluco, n=10) and common kestrel (Falco tinnunculus, n=40), two terrestrial species, and the osprey (Pandion haliaetus, n=30), a freshwater specie were included. In addition, a temporal trend (1997–2001, 2008–2009, 2013) in osprey was studied as well. The PFAS profile was dominated by perfluorooctane sulfonic acid (PFOS) in eggs from osprey and tawny owl, while for common kestrel perfluorinated carboxylic acids (∑PFCA) exceeded the level of PFOS. PFOS concentration in osprey eggs remained at the same level between 1997 and 2001 and 2013. For the long-chained PFCAs, there were a significant increase in concentrations in osprey eggs between 1997 and 2001 and 2008–2009. The levels of PFOS and PFCAs were about 10 and five times higher, respectively, in osprey compared to tawny owl and common kestrel. Evidence of direct exposure from PFCA precursor compounds to birds in both freshwater and terrestrial environment was observed. Low levels of diPAPs were detected in a few samples of osprey (<0.02–2.4 ng/g) and common kestrel (<0.02–0.16 ng/g) eggs, and 6:2 FTSA was detected in a majority of the osprey eggs (<6.3–52 ng/g). One saturated telomer acid (7:3 FTCA), which is a transformation marker from precursor exposure, was detected in all species (<0.24–2.7 ng/g). The {sup 15}N data showed higher levels in osprey eggs compared to tawny owl and common kestrel, indicating that they feed on a 2–3 times higher trophic level. We conclude that ospreys are continuously exposed to PFAS at levels where adverse toxic effects have been

  19. Comparison of PFASs contamination in the freshwater and terrestrial environments by analysis of eggs from osprey (Pandion haliaetus), tawny owl (Strix aluco), and common kestrel (Falco tinnunculus)

    International Nuclear Information System (INIS)

    Eriksson, Ulrika; Roos, Anna; Lind, Ylva; Hope, Kjell; Ekblad, Alf; Kärrman, Anna

    2016-01-01

    The level of PFAS (per- and polyfluorinated alkyl substances) contamination in freshwater and terrestrial Swedish environments in 2013/2014 was assessed by analyzing a range of perfluorinated alkyl acids, fluorotelomer acids, sulfonamides, sulfonamidoethanols and polyfluoralkyl phosphate diesters (diPAPs) in predator bird eggs. Stable isotopes ( 13 C and 15 N) were analyzed to elucidate the dietary source. The tawny owl (Strix aluco, n=10) and common kestrel (Falco tinnunculus, n=40), two terrestrial species, and the osprey (Pandion haliaetus, n=30), a freshwater specie were included. In addition, a temporal trend (1997–2001, 2008–2009, 2013) in osprey was studied as well. The PFAS profile was dominated by perfluorooctane sulfonic acid (PFOS) in eggs from osprey and tawny owl, while for common kestrel perfluorinated carboxylic acids (∑PFCA) exceeded the level of PFOS. PFOS concentration in osprey eggs remained at the same level between 1997 and 2001 and 2013. For the long-chained PFCAs, there were a significant increase in concentrations in osprey eggs between 1997 and 2001 and 2008–2009. The levels of PFOS and PFCAs were about 10 and five times higher, respectively, in osprey compared to tawny owl and common kestrel. Evidence of direct exposure from PFCA precursor compounds to birds in both freshwater and terrestrial environment was observed. Low levels of diPAPs were detected in a few samples of osprey (<0.02–2.4 ng/g) and common kestrel (<0.02–0.16 ng/g) eggs, and 6:2 FTSA was detected in a majority of the osprey eggs (<6.3–52 ng/g). One saturated telomer acid (7:3 FTCA), which is a transformation marker from precursor exposure, was detected in all species (<0.24–2.7 ng/g). The 15 N data showed higher levels in osprey eggs compared to tawny owl and common kestrel, indicating that they feed on a 2–3 times higher trophic level. We conclude that ospreys are continuously exposed to PFAS at levels where adverse toxic effects have been observed in

  20. ECOLOGICAL RISK ASSESSMENT OF ALFALFA (MEDICAGO VARIA L.) GENETICLALY ENGINEERED TO EXPRESS A HUMAN METALLOTHIONEIN (HMT) GENE

    Science.gov (United States)

    The objectives of these studies were two-fold: (1) to determine efficacy of low and high expression hMT gene constructs by assessing accumulation of Cu in shoots of parental and transgenic plants of alfalfa (Medicago varia L.) exposed to different concentrations of CuSO4 by addit...

  1. Geografia da mortalidade infantil do Brasil: variações espaciais e desigualdades territoriais

    Directory of Open Access Journals (Sweden)

    Rivaldo Faria

    2016-12-01

    Full Text Available O objetivo deste artigo é analisar as variações espaciais e as desigualdades territoriais nos indicadores de mortalidade infantil do Brasil. O estudo foi feito com todos os óbitos infantis e nascidos vivos registrados em sistemas oficiais nos anos de 2012 e 2013 nas 558 microrregiões brasileiras. Os indicadores foram calculados e estimados através do método bayesiano empírico. As características do território foram analisadas através de um indicador multicritério denominado Índice de Privação Social. Os resultados indicaram elevados coeficientes de mortalidade infantil (CMI nas microrregiões dos estados do nordeste e norte do país e fatores associados relacionados à idade da mãe, doenças infecciosas, vazios assistenciais e falta de acompanhamento pré-natal. Nas microrregiões dos estados do sudeste e sul e parte do centro-oeste os CMI são menos elevados e os fatores associados estão mais relacionados com a prematuridade e baixo peso à nascença.

  2. Variações anatômicas em Lymnaea columella (Mollusca, Gastropoda

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    Marlene T. Ueta

    1977-12-01

    Full Text Available Foram estudadas variações anatômicas de espécimes de L. columella coletados de diferentes criadouros situados em diversos Municípios do Estado de São Paulo: Campinas, Americana, Atibaia, Pirassununga, Caçapava e Taubaté. As comparações morfométricas foram baseadas em estudos do aparelho genital, rim e rádula. Foram medidos, para cada criadouro, os comprimentos do conjunto útero-vagina, dueto da espermateca, prepúcio e bainha do pênis. Foram ainda calculados os índices de relação entre bainha do pênis/prepúcio e estabelecidos os coeficientes de correlação entre comprimento da concha e comprimento do prepúcio. Cortes longitudiais do complexo peniano foram também objeto de estudo. Em relação a rádula foram determinados o número de fileiras transversais e o número de dentes por fileira, e estabelecida uma fórmula radular aproximada para os diversos criadouros.Soft parts of Lymnaea columella from ten populations from the State of São Paulo were studied in order to determine morphometric variations. These morphometric cornparisons were made upon reproductive system, kidney and radula of snail samples collected in different municipalities: Campinas, Americana, Atibaia, Pirassununga, Caçapava and Taubaté. Length measurementes of uterus, duct of spermatheca, prepuce and penis sheath were taken; the ratio penis sheath/prepuce and correlation coefficients between length of shell and length of prepuce were established. Longitudinal sections of penial complex were also studied. The number of trans verse rows, number of teeth per rows and the length of shell were determined. For each sample, the radular formula was indicated.

  3. Pollution influence in the variability of the lichen Lecanora varia (Ehrh) ach in the area of Bratislava

    Energy Technology Data Exchange (ETDEWEB)

    Pisut, I; Jelinkova, E

    1973-01-01

    The lichen Lecanora varia was transplanted from nonpolluted areas to polluted areas in Bratislava. The morphology of the organisms changed; soredia and apothecia with a soredious margin were formed. New young ascocarp with a paler colored discus and a margin were common. The transformation is conditioned by the degree of air pollution exposure. The rate is variable, and depends considerably on macroclimatic circumstances (mainly on the quantity of precipitation in winter). 10 references, 3 figures, 5 tables.

  4. Two common and problematic leucochrysine species - Leucochrysa (Leucochrysa) varia (Schneider) and L. (L.) pretiosa (Banks) (Neuroptera, Chrysopidae): redescriptions and synonymies.

    Science.gov (United States)

    Tauber, Catherine A; Sosa, Francisco; Albuquerque, Gilberto S

    2013-01-01

    We dedicate this article to the memory of Sergio de Freitas, FCAV-UNESP, Jaboticabal, São Paulo, Brazil (deceased, 2012). He was an active and enthusiastic Neuropterist and the cherished mentor and friend of Francisco Sosa. Leucochrysa McLachlan is the largest genus in the Chrysopidae, yet it has received relatively little taxonomic attention. We treat two problematic and common Leucochrysa species - Leucochrysa (Leucochrysa) varia (Schneider, 1851) and Leucochrysa (Leucochrysa) pretiosa (Banks, 1910). Both are highly variable in coloration and were described before the systematic importance of chrysopid genitalia was recognized. Recent studies show that these species occur within a large complex of cryptic species and that they have accumulated a number of taxonomic problems. We identify new synonymies for each of the species-for Leucochrysa (Leucochrysa) varia: Leucochrysa (Leucochrysa) ampla (Walker, 1853), Leucochrysa internata (Walker, 1853), and Leucochrysa (Leucochrysa) walkerina Navás, 1913; for Leucochrysa (Leucochrysa) pretiosa: Leucochrysa (Leucochrysa) erminea Banks, 1946. The synonymy of Leucochrysa delicata Navás, 1925 with Leucochrysa (Leucochrysa) pretiosa is stabilized by the designation of a neotype. The following species, which were previously synonymized with Leucochrysa (Leucochrysa) varia or Leucochrysa (Leucochrysa) pretiosa, are reinstated as valid: Leucochrysa (Leucochrysa) phaeocephala Navás, 1929, Leucochrysa (Leucochrysa) angrandi (Navás, 1911), and Leucochrysa (Leucochrysa) variata (Navás, 1913). To help stabilize Leucochrysa taxonomy, lectotypes are designated for Allochrysa pretiosa and Allochrysa variata. Finally, Leucochrysa vegana Navás, 1917 is considered a nomen dubium.

  5. Variação morfológica e populacional de Trachemys dorbigni (Testudines, Emydidae) no extremo sul do Brasil

    OpenAIRE

    Silveira, Melise Lucas

    2014-01-01

    A presente dissertação, intitulada “Variação Morfológica e populacional de Trachemys dorbigni (Testudines, Emydidae) no extremo sul do Brasil”, encontra-se organizada em dois artigos. O primeiro artigo, intitulado “Variação geográfica na morfologia e estrutura populacional de Trachemys dorbigni (Testudines, Emydidae) no extremo sul do Brasil” e o segundo artigo, com o título: “Irregularidades no padrão de escudos de Trachemys dorbigni (Testudines, Emydidae): ontogenia e variação espacial”. Es...

  6. Habitualidade e variação entre pretérito imperfeito e perífrases imperfectivas em contos escritos em espanhol

    Directory of Open Access Journals (Sweden)

    Márluce Coan

    2012-11-01

    Full Text Available Resumo: Neste artigo, tratamos da variação linguística entre o pretérito imperfeito e perífrases imperfectivas na codificação do aspecto habitual em espanhol. Deram suporte a nossa pesquisa, dentre outros, pressupostos do Funcionalismo Linguístico (HOPPER & THOMPSON, 1980; GIVÓN, 1990 e da Teoria da Variação e Mudança (LABOV, 1972. Nossos dados provêm de vinte e quatro contos escritos por autores de língua espanhola, selecionados a partir do parâmetro comarca cultural: Caribe; México e América Central; Andes; Rio da Prata; Chile; e Espanha. Obtivemos um total de 126 dados, sendo que 29 desses são de formas do pretérito imperfeito do indicativo, 23% do total, e 97 de perífrases imperfectivas de passado, o que corresponde a 77% do total. Constatamos que, na função habitual, as perífrases ocorrem, mais frequentemente, motivadas por sujeito agentivo, estilo dos autores Gabriel García Márquez e Virgilio Piñera, verbos dinâmicos e durativos e presença de modificador aspectual.Palavras-chave: Habitualidade; perífrases imperfectivas; pretérito imperfeito.Abstract: In this article, we deal with the linguistic variation between the imperfect past tense and imperfective periphrases in the encoding of habitual aspect in Spanish. As theoretical backgrounds, among others, we used Linguistic Functionalism (HOPPER & THOMPSON, 1980; GIVÓN, 1990 and Variation and Change Theory (LABOV, 1972. Our data comes from twenty four short stories written by Spanish language writers, selected based on the cultural region parameter: Caribe; Mexico and Central America; Andes, Rio da Prata; Chile; and Spain. It was obtained a total of 126 data: 29 of them are imperfect past tense of indicative forms, that is, 23% of the total, and 97 are imperfective periphrasis of past, that is, 77% of the total. In the habitual function it was found that periphrasis occur more frequently, motivated by agentive subject, the style of the writers Gabriel García M

  7. The evolution of mapping habitat for northern spotted owls (Strix occidentalis caurina): A comparison of photo-interpreted, Landsat-based, and lidar-based habitat maps

    Science.gov (United States)

    Ackers, Steven H.; Davis, Raymond J.; Olsen, K.; Dugger, Catherine

    2015-01-01

    Wildlife habitat mapping has evolved at a rapid pace over the last few decades. Beginning with simple, often subjective, hand-drawn maps, habitat mapping now involves complex species distribution models (SDMs) using mapped predictor variables derived from remotely sensed data. For species that inhabit large geographic areas, remote sensing technology is often essential for producing range wide maps. Habitat monitoring for northern spotted owls (Strix occidentalis caurina), whose geographic covers about 23 million ha, is based on SDMs that use Landsat Thematic Mapper imagery to create forest vegetation data layers using gradient nearest neighbor (GNN) methods. Vegetation data layers derived from GNN are modeled relationships between forest inventory plot data, climate and topographic data, and the spectral signatures acquired by the satellite. When used as predictor variables for SDMs, there is some transference of the GNN modeling error to the final habitat map.Recent increases in the use of light detection and ranging (lidar) data, coupled with the need to produce spatially accurate and detailed forest vegetation maps have spurred interest in its use for SDMs and habitat mapping. Instead of modeling predictor variables from remotely sensed spectral data, lidar provides direct measurements of vegetation height for use in SDMs. We expect a SDM habitat map produced from directly measured predictor variables to be more accurate than one produced from modeled predictors.We used maximum entropy (Maxent) SDM modeling software to compare predictive performance and estimates of habitat area between Landsat-based and lidar-based northern spotted owl SDMs and habitat maps. We explored the differences and similarities between these maps, and to a pre-existing aerial photo-interpreted habitat map produced by local wildlife biologists. The lidar-based map had the highest predictive performance based on 10 bootstrapped replicate models (AUC = 0.809 ± 0.011), but the

  8. Rukopisni zbornik Varia Dalmatica (Codex Lucianus) kao svjedočanstvo humanističke književne komunikacije

    OpenAIRE

    Jovanović, Neven

    2008-01-01

    Lokalnoj književnoj komunikaciji — prepoznatljivoj, za potrebe ovog teksta, po apostrofiranju konkretnoga, stvarnog adresata — namijenjeno je 99 tekstova rukopisnog zbornika Varia Dalmatica (Zadar, Znanstvena biblioteka, sign. 25290, ms. 617). Svi su tekstovi nastali do siječnja 1614, a prepisao ih je Trogiranin Petar Lucić; samo je četiri pjesme povodom njegove smrti prepisao Petrov sin Ivan, budući glasoviti povjesničar. Tekstovi lokalne književne komunikacije većinom su pjesme (samo su dva...

  9. Nomenklaturno-fitocenološka revizija asocijacije Calamagrostio variae-Piceetum dinaricum Bertović 1975 nom. illeg. u Hrvatskoj

    OpenAIRE

    Vukelić, Joso; Alegro, Antun; Šegota, Vedran; Šapić, Irena

    2010-01-01

    U široj okolici Zavižana na sjevernom Velebitu, S. Bertović je (1975) opisao smrekovu asocijaciju sa šarenkastom šašuljicom (Calamagro­stio variae-Piceetum dinaricum Bertović 1975). Naziv je asocijacije nelegiti­man (čl. 31. i 34a, Međunarodni kodeks fitocenološke nomenklature /ICPN/, Weber, Moravec i Theurillat 2000) pa je u radu naziv promijenjen u Hyperico grisebachii-Piceetum abietis (Bertović 1975) nom. nov. hoc loco i tako nomen­katurno revidiran. Osim toga, fitocenoza je istražena na š...

  10. Atmospheric correction of SeaWiFS ocean color imagery in the presence of absorbing aerosols off the Indian coast using a neuro-variational method

    Science.gov (United States)

    Brajard, J.; Moulin, C.; Thiria, S.

    2008-10-01

    This paper presents a comparison of the atmospheric correction accuracy between the standard sea-viewing wide field-of-view sensor (SeaWiFS) algorithm and the NeuroVaria algorithm for the ocean off the Indian coast in March 1999. NeuroVaria is a general method developed to retrieve aerosol optical properties and water-leaving reflectances for all types of aerosols, including absorbing ones. It has been applied to SeaWiFS images of March 1999, during an episode of transport of absorbing aerosols coming from pollutant sources in India. Water-leaving reflectances and aerosol optical thickness estimated by the two methods were extracted along a transect across the aerosol plume for three days. The comparison showed that NeuroVaria allows the retrieval of oceanic properties in the presence of absorbing aerosols with a better spatial and temporal stability than the standard SeaWiFS algorithm. NeuroVaria was then applied to the available SeaWiFS images over a two-week period. NeuroVaria algorithm retrieves ocean products for a larger number of pixels than the standard one and eliminates most of the discontinuities and artifacts associated with the standard algorithm in presence of absorbing aerosols.

  11. Presence of Social Presence during Disasters

    DEFF Research Database (Denmark)

    Mukkamala, Alivelu Manga; Beck, Roman

    2017-01-01

    During emergencies, affected people use social media platforms for interaction and collaboration. Social media is used to ask for help, provide moral support, and to help each other, without direct face-to-face interactions. From a social presence point of view, we analyzed Twitter messages...... to understand how people cooperate and collaborate with each other during heavy rains and subsequent floods in Chennai, India. We conducted a manual content analysis to build social presence classifiers comprising intimacy and immediacy concepts which we used to train a machine learning approach to subsequently...

  12. Variação estacional da oferta e preços de couve-flor em Minas Gerais

    Directory of Open Access Journals (Sweden)

    Luis Felipe Lima e Silva

    2014-06-01

    Full Text Available Em virtude da variedade de cultivares atualmente disponíveis, de suas diferentes exigências climáticas e das diferenças climáticas entre as várias regiões produtoras, a couve-flor pode apresentar variações estacionais de oferta e de preços ao longo do ano. O objetivo do presente trabalho foi estudar a variação estacional da oferta e dos preços da couve-flor praticados no Estado de Minas Gerais, representados pelas unidades da CEASAMINAS, bem como as componentes dessa oferta para cada principal região abastecedora do Estado, no período de 2005 a 2009. A unidade CEASAMINAS (Grande BH foi responsável por 68% da comercialização anual de couve-flor em Minas Gerais por meio das unidades da CEASAMINAS, que oscilou entre 9.420 e 10.937 toneladas anuais. A quase totalidade de produção proveio de municípios mineiros, localizados em quatro grandes mesorregiões: Região Metropolitana de Belo Horizonte, Campo das Vertentes, Triângulo Mineiro e Vale do Rio Doce, que representaram, respectivamente, 49%, 28%, 9% e 6% da oferta anual. As variações estacionais de oferta refletiram claramente as limitações dos cultivares atualmente disponíveis e a necessidade de novos cultivares que possam tolerar as grandes oscilações de temperatura nos meses de meia estação. Também ficou evidente que, a despeito da disponibilidade de cultivares de verão, a produção de couve-flor ainda é mais baixa nessa época do ano, um reflexo provável da alta precipitação que ocasiona maiores perdas por doenças na lavoura e em pós-colheita.

  13. Diámetro biparietal en fetos a término en varias razas de perros

    OpenAIRE

    Cahua U, Jacqueline; Quispe M, Lizeth

    2016-01-01

    El presente estudio tuvo por objetivo la determinación de la medición ecográfica cuantitativa del diámetro biparietal de fetos a término en perras. Se trabajó con 181 informes ecográficos de varias razas de perras en gestación cuyos fetos tenían menos de 210 latidos por minuto, y que fueron examinados en el consultorio de ecografía de la Clínica de Animales Menores de la Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima, Perú, entre los años 2000-2014. The pr...

  14. Modos em vigas com secção transversal de variação linear

    OpenAIRE

    Jovita Rasch Bracht Juver

    2002-01-01

    O objetivo principal deste trabalho é a obtenção dos modos e as freqüências naturais de vigas de variação linear e em forma de cunha, com condições de contorno clássicas e não-clássicas, descritas pelo modelo estrutural de Euler-Bernoulli. A forma dos modos foi determinado com o uso das funções cilíndricas. No caso forçado se considera uma força harmônica e se resolve o problema pelo método espectral, utuilizando o software simbólico Maple V5. Realiza-se uma análise comparativa dos resultados...

  15. Relação entre idade e variação da flexibilidade de bailarinas

    Directory of Open Access Journals (Sweden)

    Aline Huber da Silva

    2008-10-01

    Full Text Available O objetivo deste estudo foi verificar se o comportamento da flexibilidade, após 8 semanas de aplicação da técnica de alongamento por Facilitação Neuromuscular Proprioceptiva em bailarinas, tem relação com suas idades. A amostra foi obtida de forma intencional, composta por 11 bailarinas na faixa etária de 13 a 16 anos. Realizou-se avaliação da flexibilidade angular dos movimentos de flexão (com o joelho estendido, abdução e rotação externa do quadril através da goniometria e da flexibilidade linear com a Caixa de Sentar e Alcançar de Wells, antes e após o período experimental de oito semanas, com duas intervenções semanais, utilizando a técnica de FNP. Para análise, usou-se estatística descritiva, teste t e correlação linear de Pearson. Adotou-se significância de 5%. Somente a variação da rotação externa e da Caixa de Sentar e Alcançar, durante o período experimental, apresentaram correlação estatisticamente significativa com a idade das bailarinas, porém, essa correlação ainda assim foi bastante fraca. Pode-se perceber que praticamente não houve relação entre a variação da flexibilidade com a idade da amostra.

  16. Variação na cobertura vegetal nativa em São Paulo: um panorama do conhecimento atual

    Directory of Open Access Journals (Sweden)

    Juliana Sampaio Farinaci

    2012-08-01

    Full Text Available Estudos em diversos países têm evidenciado a ocorrência de transição florestal, fenômeno em que o aumento da cobertura florestal supera as perdas por desflorestamento. No Brasil, embora o desflorestamento ocorra em maior grau que a expansão das florestas, é possível que em certas regiões essa relação seja inversa. Levantamentos recentes sugerem a tendência do Estado de São Paulo em direção à transição florestal. Com os objetivos de analisar as evidências dessa transição e facilitar o uso da informação já existente, fez-se uma revisão de quatro fontes de dados sobre a variação da cobertura vegetal nativa em São Paulo (Instituto Florestal, SOS Mata Atlântica/INPE, IBGE e CATI/IEA. Os resultados indicaram que as discrepâncias entre esses levantamentos podem, ao menos em parte, ser atribuídas a diferenças metodológicas e de objetivos. Ressaltam-se seus pontos de concordância e discutem-se possibilidades de harmonização dessas informações.

  17. Presence While Watching Movies

    Directory of Open Access Journals (Sweden)

    Tom Troscianko

    2011-05-01

    Full Text Available “Presence” is the illusion of being in a mediated experience rather than simply being an observer. It is a concept often applied to the question of realism of virtual environments. However, it is equally applicable to the act of watching a movie. A movie provides a markedly different visual environment to that given by the natural world—particularly because of frequent edits. And yet, the audience in a movie achieves high levels of presence. We investigate the relationship between presence and the optical and temporal parameters of movies. We find effects of mean shot length, colour/b&w, and 3D/2D. We find that short shots, while being unnatural, are associated with high levels of presence. We consider why such artificial stimuli should appear so real and immersive.

  18. A variação denominativa nos textos especializados da aromaterapia: o caso da unidade terminológica Alecrim = Rosemary variation within Aromatherapy texts

    Directory of Open Access Journals (Sweden)

    Neide Munhoz Albano

    2010-07-01

    Full Text Available Este artigo objetiva discutir a variação da planta Alecrim, no âmbito da denominação científica e popular, na ótica do prescritivismo das teorias da variação linguística. A análise concentra-se nas variantes terminológicas em consonância com seu uso.This article aims to discuss variation with respect to the scientific and common denominations of the Rosemary plant, based on the approach of prescription of the theories of linguistic variation. The analysis focuses on the terminological variants in consonance with their use by experts in the field.

  19. J.S.Bach variações "Goldberg" : um guia para a formação do homem completo

    OpenAIRE

    Helena Jank

    1988-01-01

    Resumo: Dentre muitas formas possíveis de abordagem para esta obra monumental de J. S. Bach, o presente trabalho traz um enfoque eminentemente humanístico, através do qual transparece a intenção do compositor de estruturar, na forma de tema e variações um ?guia para a formação do homem completo? Esta intenção se manifesta na organização geral da obra, com uma clara divisão em três grupos de variações, nos quais são explorados aspectos técnicos, composicionais e de interpretação. Com base na ...

  20. PresenceRemote

    DEFF Research Database (Denmark)

    Sokoler, Tomas; Svensson, Marcus Sanchez

    2008-01-01

    how these technologies can accommodate the specific challenges related to the everyday life of elderly people. In particular, using an example concept – the PresenceRemote – we will discuss how the stigma associated with being lonely, an inherent part of senior living, can be addressed by leaving room...

  1. The presence of ADHD

    DEFF Research Database (Denmark)

    Breining, Sanni Nørgaard

    2014-01-01

    This paper uses high quality register-data to study the spillover effects on firstborns from having a younger sibling suffering from ADHD. Using OLS and cousin fixed effects analyses it is found that the educational outcomes of healthy firstborn children are significantly reduced by the presence...

  2. Connected media and presence

    NARCIS (Netherlands)

    Kort, J.; Nefs, H.T.; Gullström, C.; Greef, T.J. de; Parnes, P.

    2013-01-01

    Effective design of shared mediated spaces, information and connectedness requires theory and practice from a range of disciplines such as found in European projects like Together Anywhere, Together Anytime (TA2) and the EIT ICT Labs Mediating Presence activity. Building on this work we continue to

  3. Variação sazonal nos teores de flavonoides, taninos e atividade antioxidante de Davilla rugosa Poir.

    Directory of Open Access Journals (Sweden)

    Jéssica Marques Macedo

    2013-12-01

    Full Text Available Davilla rugosa Poir. (Dilleniaceae é uma trepadeira, conhecida como folha de lixa e cipó-cabloco, com distribuição geográfica ampla no Brasil. É utilizada como analgésica, vasoconstritora, antiúlcera, útil no tratamento das hemorroidas e varizes. O objetivo do trabalho foi investigar a influência da variação sazonal sobre alguns parâmetros das folhas de D. rugosa, como os teores de flavonoides e taninos. Os teores de flavonoides e taninos, determinados nas 4 estações do ano, foram avaliados segundo a Farmacopeia Brasileira e foram mais elevados no verão (0,71%; 16,73% seguido do outono (0,58%; 16,39%. Considerando que substâncias fenólicas são, provavelmente, os responsáveis pela atividade anti-inflamatória e antiulcerogênica, podemos inferir que a melhor época de coleta, que conduza a uma matéria-prima com concentrações desejáveis de princípios ativos, é, preferencialmente, no verão seguida do outono. A atividade antioxidante do extrato de acetato de etila, desengordurado com hexano, submetido ao teste do DPPH, apresentou uma CE50 de 24,73 ± 2,95 µg/ mL e no ensaio do fosfomobdênio de 1,85 ±0,57 mmol de ácido ascórbico/mg de extrato seco. A atividade antioxidante encontrada nos extratos reforça os efeitos anti-inflamatórios e antiúlcera gástrica atribuídos para a espécie.

  4. CÁLCULO DE LOS COSTOS DE CALIDAD EN LA UNIDAD EMPRESARIAL DE BASE PRODUCCIONES VARIAS, CIENFUEGOS

    Directory of Open Access Journals (Sweden)

    Gómez Alfonso, Elizabeth

    2013-01-01

    Full Text Available El cálculo de los costos de calidad como elemento integrante del Sistema de Gestión de la Calidad, es una necesidad para los directivos de las empresas cubanas, al constituir una técnica identificada como instrumento avanzado de gestión, que permitirá mejorar la competitividad y servir de fuente informativa. Identificar y calcular los costos de calidad, así como proponer planes de medidas, que propicien una disminución de los gastos operativos, lo cual puede ser utilizado como herramienta para mejorar los procesos. La Unidad Empresarial de Base Producciones Varias de Cienfuegos presenta el diagnóstico para dar paso al Perfeccionamiento Empresarial y a la certificación de su Sistema de Gestión de la Calidad, según la Norma NC-ISO 9001:2008 y el decreto Ley 281, por lo que el objetivo de la investigación fue calcular los costos de calidad por procesos en dicha empresa. Para lograrlo se utilizaron métodos de nivel empírico y técnicas como la observación directa, revisión documental y el trabajo en grupos, lo cual permitió calcular los costos de calidad en todos los procesos. Los resultados alcanzados son aplicables a empresas que operan en la economía cubana y según el modelo económico cubano puesto en práctica a partir del año 2011.

  5. Variações nos períodos de pulsação das estrelas PG 1159-035 e G117-B15-A

    Science.gov (United States)

    Costa, J. E. S.; Kepler, S. O.

    2003-08-01

    A medida que uma estrela evolui, sua trajetória no diagrama-HR passa pelas chamadas "faixas de instabilidade" podendo tornar-se uma variável. Ao longo da seqüência das anãs brancas existem três faixas de instabilidade, contando com a faixa das pré-anãs brancas (DOs). Estrelas nestas faixas podem apresentar pulsações não-radiais com períodos bastante estáveis, ente 100 e 1000 segundos. Os períodos de pulsação sofrem variações com a evolução da estrela, podendo aumentar ou diminuir. As DOs, por serem mais quentes evoluem mais rapidamente e isto faz com que as variações em seus períodos de pulsação sejam maiores (em magnitude) do que as variações que ocorrem nos períodos de pulsação de anãs brancas pulsantes mais frias como as DBs e as DAs. Neste trabalho apresentamos os resultados das medidas das variações de períodos de pulsação de duas estrelas: a PG 1159-035 e a G117-B15-A. Essas duas estrelas estão nos extremos da seqüência das anãs brancas: a PG 1159-035 é uma pré-anã branca (DO) e seus períodos de pulsação variam na ordem de 1 segundo a cada 3000 anos. Já a G117-B15-A é uma DA e seus períodos de pulsação variam cerca de 1 segundo a cada 30 milhões de anos.

  6. Two common and problematic leucochrysine species – Leucochrysa (Leucochrysa varia (Schneider and L. (L. pretiosa (Banks (Neuroptera, Chrysopidae: redescriptions and synonymies

    Directory of Open Access Journals (Sweden)

    Catherine Tauber

    2013-06-01

    Full Text Available Leucochrysa McLachlan is the largest genus in the Chrysopidae, yet it has received relatively little taxonomic attention. We treat two problematic and common Leucochrysa species – Leucochrysa (Leucochrysa varia (Schneider, 1851 and Leucochrysa (Leucochrysa pretiosa (Banks, 1910. Both are highly variable in coloration and were described before the systematic importance of chrysopid genitalia was recognized. Recent studies show that these species occur within a large complex of cryptic species and that they have accumulated a number of taxonomic problems. We identify new synonymies for each of the species – for L. (L. varia: Leucochrysa (Leucochrysa ampla (Walker, 1853, Leucochrysa internata (Walker, 1853, and Leucochrysa (Leucochrysa walkerina Navás, 1913; for L. (L. pretiosa: Leucochrysa erminea Banks 1946. The synonymy of Leucochrysa delicata Navás 1925 with L. (L. pretiosa is stabilized by the designation of a neotype. The following species, which were previously synonymized with L. (L. varia or L. (L. pretiosa, are reinstated as valid: Leucochrysa phaeocephala Navás 1929, Leucochrysa (Leucochrysa angrandi (Navás, 1911, and Leucochrysa (Leucochrysa variata (Navás, 1913. Finally, Leucochrysa vegana Navás 1917 is considered a nomen dubium.

  7. O tratamento da diversidade e variação linguísticas em livros didáticos de Português

    Directory of Open Access Journals (Sweden)

    Cláudia Goulart Morais

    2015-12-01

    Full Text Available Neste trabalho, analiso como a diversidade e a variação linguísticas são tratadas nos Livros Didáticos de Português (LDP nos anos finais do ensino fundamental, na tentativa de problematizar como as atividades propostas nesses materiais didáticos tematizam conceitos sociolinguísticos importantes, tais como o conceito de norma e as relações entre fala e escrita e oralidade e letramento. As análises dos dados validaram a nossa hipótese de que nos LDP, que circulam atualmente nas escolas brasileiras, ainda predomina a submissão das marcas da diversidade e da variação linguísticas aos processos de normatização da língua, mesmo onde se propõe apresentar e discutir a variação linguística. As análises validaram, também, o nosso entendimento de que tais atividades dos LDP fazem parte do processo de valorização da norma padrão como a única variedade legítima e a modalidade escrita formal como aquela gramaticalmente organizada.

  8. Body: presence and transience

    Directory of Open Access Journals (Sweden)

    Marcelo Andrés Comandú

    2012-11-01

    Full Text Available We conceive presence as an event that takes place in the body and among the bodies. In the work of making themselves present, the performer creates a territory-body of habitability/inter-penetration of states, actions, thoughts, voices, sonorities; a body-space with multiple trajectories, withdrawn and projected from its own existence/subjectivity, extended in other matters and exposed to other odies/subjects/objects. We regard the performer’s body as an intense, outstretched, and expanded body. We deal with these categories from the standpoint of various practices and conceptualizations of body and event, in order to reflect on the constitution/construction of presence in performance.

  9. Capturing Online Presence

    DEFF Research Database (Denmark)

    de Bakker, Frank; Hellsten, Lina

    2013-01-01

    The rise of Internet-mediated communication poses possibilities and challenges for organisation studies, also in the area of corporate social responsibility (CSR) and business and society interactions. Although social media are attracting more and more attention in this domain, websites also remain...... an important channel for CSR debate. In this paper, we present an explorative study of activist groups’ online presence via their websites and propose a combination of methods to study both the structural positioning of websites (hyperlink network analysis) and the meanings in these websites (semantic co...... activist networks’ online presence can provide insights into the tactics these networks apply to achieve institutional change on CSR issues. Meanwhile, we identify some notable differences between styles and word use in the two organisations’ websites. We conclude with a set of suggestions for future...

  10. Presence of the gift

    Directory of Open Access Journals (Sweden)

    Game, Ann

    2010-01-01

    Full Text Available Philosophers, social theorists and cultural theorists have generally followed Mauss in assuming that gifts entail obligatory exchanges between distinct parties who give, receive and reciprocate, and, that the social emerges through this sequence of obligations. It is the obligation to reciprocate, for example, that led Derrida to claim that the gift is impossible. We consider the alternative ideas that non-exchange gifts are not only possible but the basis of social life: that the social arises from the nonsequential giving-and-receiving of a gift relation. To develop this claim, we draw on a research project on the phenomenology of teaching. While many interviewees, teachers and students, spoke of the gift in exchange terms, many also spoke of classroom experiences in which there is a giving and receiving that is neither sequential nor locatable. Through the resonances of the concept of presence, we draw out the time, space and ontology of the gift.

  11. Presence of the Gift

    Directory of Open Access Journals (Sweden)

    Ann Game

    2010-03-01

    Full Text Available Philosophers, social theorists and cultural theorists have generally followed Mauss in assuming that gifts entail obligatory exchanges between distinct parties who give, receive and reciprocate, and, that the social emerges through this sequence of obligations. It is the obligation to reciprocate, for example, that led Derrida to claim that the gift is impossible. We consider the alternative ideas that non-exchange gifts are not only possible but the basis of social life: that the social arises from the nonsequential giving-and-receiving of a gift relation. To develop this claim, we draw on a research project on the phenomenology of teaching. While many interviewees, teachers and students, spoke of the gift in exchange terms, many also spoke of classroom experiences in which there is a giving and receiving that is neither sequential nor locatable. Through the resonances of the concept of presence, we draw out the time, space and ontology of the gift.

  12. Variação sazonal da fotossíntese e clorofila em progênies de Grevillea robusta Cunn

    OpenAIRE

    Inoue, Mario Takao; UNICENTRO; Martins, Emerson Gonçalves; EMBRAPA

    2009-01-01

    Avaliou-se a fotossíntese e o teor de clorofila em seis progênies de Grevillea robusta Cunn. durante um ano, visando detectar possíveis variações sazonais. As progênies demonstraram reações distintas entre si e entre as estações do ano, sugerindo que as grandezas fisiológicas podem servir como indicadores do comportamento genético aos quatro anos de idade das progênies testadas. A fotossíntese elevou-se no sentido do inverno para primavera e verão, para decair no sentido do outono-inverno. A ...

  13. Análise das variações anatômicas do canal da mandíbula encontradas em radiografias panorâmicas

    Directory of Open Access Journals (Sweden)

    Yza Daniella Nunes Andrade

    Full Text Available INTRODUÇÃO: No âmbito da clínica odontológica, o bloqueio do nervo alveolar inferior é o mais utilizado; todavia, diversos estudos têm mostrado as mais altas taxas de fracasso, as quais, normalmente, têm como motivo a falha na observação da posição, da forma e da anatomia dos nervos. Essas falhas decorrentes da variação anatômica do nervo alveolar inferior já vêm sendo estudadas na literatura, através de estudos com a análise de radiografias panorâmicas, como proposto neste estudo. OBJETIVO: O objetivo deste estudo foi verificar a ocorrência e a prevalência das variações anatômicas, bem como a correlação das variações do canal da mandíbula com lado e sexo, que podem ocorrer no canal mandibular, por meio de radiografias panorâmicas de pacientes atendidos no Departamento de Odontologia da Universidade Federal de Sergipe (UFS. MATERIAL E MÉTODO: Foram analisadas 1.500 radiografias panorâmicas de pacientes atendidos pelo Departamento de Odontologia da Universidade Federal de Sergipe (UFS. Imagens radiográficas foram observadas sobre um negatoscópio, utilizando-se uma máscara preta ao redor das radiografias, em ambiente com luminosidade apropriada. RESULTADO: Neste estudo, foram observados 5,3% de bifurcações do canal mandibular; 47,5% de canais altos; 16,8% de canais intermediários; 27,1% de canais baixos, e 8,6% de canais com outras variações. CONCLUSÃO: Baseando-se na altura do canal mandibular, houve maior prevalência dos canais altos do que os demais nas mulheres, sendo que não houve diferenças entre os gêneros com relação aos demais tipos e lados afetados. Na classificação dos canais bífidos, não houve diferença estatisticamente significante entre homens e mulheres. Observou-se que a maior prevalência foi para canais sem bifurcação.

  14. Código para imageamento indireto de estrelas em sistemas binarios: simulação de variações elipsoidais e do perfil das linhas

    Science.gov (United States)

    Souza, T. R.; Baptista, R.

    2003-08-01

    As estrelas secundárias em variáveis cataclí smicas (VCs) e binárias-x de baixa massa (BXBMs) são cruciais para o entendimento da origem, evolução e comportamento destas binárias interagentes. Elas são estrelas magneticamente ativas submetidas a condições ambientais extremas [e.g., estão muito próximas de uma fonte quente e irradiante; têm rotação extremamente rápida e forma distorcida; estão perdendo massa a taxas de 10-8-10-10 M¤/ano] que contribuem para que suas propriedades sejam distintas das de estrelas de mesma massa na seqüência principal. Por outro lado, o padrão de irradiação na face da secundária fornece informação sobre a geometria das estruturas de acréscimo em torno da estrela primária. Assim, a obtenção de imagens da superfície destas estrelas é de grande interesse astrofísico. A Tomografia Roche usa as variações no perfil das linhas de emissão/absorção da estrela secundária em função da fase orbital para mapear a distribuição de brilho em sua superfície. Neste trabalho apresentamos os resultados iniciais do desenvolvimento de um programa para o mapeamento da distribuição de brilho na superfí cie das estrelas secundárias em VCs e BXBMs com técnicas de astro-tomografia. Presentemente temos em operação um código que simula as variações no perfil das linhas em conseqüência de efeito Doppler resultante da combinação de rotação e translação de uma estrela em forma de lobo de Roche em torno do centro de massa da binária, em função da distribuição de brilho na superfície desta estrela. O código igualmente produz a curva de luz resultante das variações de aspecto da estrela em função da fase orbital (variações elipsoidais).

  15. Variação temporal do gradiente radial de o/h a partir de uma amostra de nebulosas planetárias

    Science.gov (United States)

    Maciel, W. J.; Costa, R. D. D.; Uchida, M. M. M.

    2003-08-01

    Gradientes radiais de abundância são observados no disco de nossa Galáxia e também em outras galáxias espirais. No caso da Galáxia, o principal problema relativo aos gradientes é sua variação temporal, que constitui um dos principais vínculos aos modelos de evolução química da Galáxia. As nebulosas planetárias são particularmente interessantes no estudo dos gradientes e suas variações, tanto espaciais como temporais. São objetos brilhantes, podendo ser observadas a grandes distâncias, e têm abundâncias relativamente precisas de diversos elementos químicos. Além disso, sendo originadas de estrelas com massas entre 0.8 e 8 massas solares na sequência principal, incluem objetos com idades e populações diferentes, o que as torna especialmente interessantes ao estudo da variação temporal dos gradientes. Neste trabalho, apresentamos resultados recentes sobre a variação temporal do gradiente de O/H a partir de uma amostra contendo cerca de 200 nebulosas, para as quais obtivemos distâncias por métodos estatísticos. As abundâncias foram parcialmente obtidas a partir de observações em Itajubá e La Silla, sendo as restantes obtidas da literatura. Os resultados mostram, pela primeira vez, evidências de um achatamento do gradiente de O/H, de -0.11 dex/kpc para -0.06 dex/kpc nos últimos 9 giga-anos ou de -0.08 dex/kpc para -0.06 dex/kpc nos últimos 5 giga-anos. Esses valores apresentam um bom acordo com alguns modelos recentes para a evolução química da Galáxia. (FAPESP/CNPq)

  16. Variação de temperatura do músculo quadríceps femoral exposto a duas modalidades de crioterapia por meio de termografia

    OpenAIRE

    Carvalho,Alberito Rodrigo de; Medeiros,Daiane Lazzeri de; Souza,Francieli Tibes de; Paula,Grazieli Francine de; Barbosa,Patrícia Mantovani; Vasconcellos,Paula Renata Olegini; Buzanello,Márcia Rosângela; Bertolini,Gladson Ricardo Flor

    2012-01-01

    INTRODUÇÃO: Crioterapia é qualquer forma de aplicação terapêutica de frio que leva à diminuição da temperatura dos tecidos. OBJETIVO: Comparar as variações na temperatura superficial do músculo quadríceps femoral, em três momentos distintos, quando expostos a duas modalidades de crioterapia: sacos com gelo ou sacos contendo mistura de gelo e água. MATERIAIS E MÉTODOS: Participaram do estudo 18 indivíduos, com idade entre 18 e 25 anos, de ambos os sexos. Em cada voluntário foi realizada, simul...

  17. Variação inter-individual nos níveis de bilirrubina: o papel dos factores genéticos e adquiridos

    OpenAIRE

    Rodrigues, Carina; Vieira, Emília; Santos, Rosário; Carvalho, João; Santos-Silva, Alice; Elísio, Costa; Bronze-da-Rocha, Elsa

    2011-01-01

    A bilirrubina é um pigmento biliar que deriva principalmente do catabolismo da hemoglobina. É um marcador bioquímico de doenças hepáticas e hematológicas e tem vindo a ser alvo de interesse devido à sua capacidade antioxidante. O objectivo deste trabalho foi avaliar a contribuição de vários factores para a variação da concentração da bilirrubina sérica na população portuguesa. Foi analisado o contributo dos polimorfismo genéticos no promotor do gene UGT1A1 (c.-41_40...

  18. EJEMPLIFICACIÓN DE UNA ESTRATEGIA METODOLÓGICA PARA CONTRIBUIR AL DESARROLLO DE COMPETENCIAS EN LA ASIGNATURA DEL CÁLCULO DE VARIAS VARIABLES

    Directory of Open Access Journals (Sweden)

    Juan Carlos Ruiz Mendoza

    2015-12-01

    Full Text Available En esta investigación se aplicó una estrategia didáctica centrada en la realización de actividades para el desarrollo de competencias formativas en el aula clase, mediante el vínculo de la teoría con la práctica, a estudiantes que ya habían cursado la asignatura del Cálculo de varias variables que se imparte en la Facultad de Ciencias Físico Matemáticas de la Universidad Autónoma de Nuevo León. Para ello se utilizó el software Cabri Plus 11 como medio para la comprensión de los temas de la asignatura, tomando en cuenta las potencialidades del proceso didáctico así como las potencialidades del Cálculo de varias variables. Se muestran los resultados parciales de la aplicación de la estrategia.

  19. Variação da densidade básica da madeira de progênies de Eucalyptus urophylla em dois locais.

    Directory of Open Access Journals (Sweden)

    Maria Aparecida Mourão Brasil

    2009-09-01

    Full Text Available Normal 0 21 false false false MicrosoftInternetExplorer4 Estudou-se neste trabalho a variação da densidade básica da madeira entre procedências e progênies de eucalipto plantados em duas localidades. As progênies de Eucalyptus urophylla originárias da ilha de Timor na Indonésia foram plantadas em Belo Oriente (MG e Linhares (ES no delineamento de blocos compactos em famílias (compact family blocks com 3 repetições no espaçamento de 3,0 x 2,0m. Após 4 anos as  árvores  foram amostradas ao nível do DAP com a sonda Pressler e sua densidade básica determinada pelo método do máximo teor de umidade. Os resultados mostraram que as progênies tiveram  comportamento similar nos dois locais. A maior variação entre progênies ocorreu naquelas provenientes da região Oebaha II. Os valores médios de densidade básica* das progênies não foram diferentes das procedências brasileiras utilizadas como testemunhas no experimento.

  20. Variações na composição de queijo Minas artesanal da Serra da Canastra nas quatro estações do ano.

    Directory of Open Access Journals (Sweden)

    Luiz Carlos Gonçalves Costa Junior

    2009-12-01

    Full Text Available Muitos, estudos ja foram conduzido com queijos artesanais nas regiões produtoras dc estado de Minas Gerais, e particularmente na Serra da Canastra, porém, os mesmos ainda são muito carentes de estudos que permitam melhoria da qualidade, padronização entre produtores e ao longo das variações sazonais que acontecem. Este trabalho estudou a composição do queijo Canastra a partir da escolha de uma quedaria típica e tradicional da região e em cada uma das quatro estações do ano. Poucas diferenças de temperatura e umidade relativa puderam ser verificadas entre as estações que mostra uma descaracterização entre elas. Porém mesmo assim resultaram em diferenças significativas na composição dos queijos, também per causa da sazonalidade da produção do leite e variação no "pingo", e, ainda pela despadronização do leite para fabricação de queijo, mesmo com o processo de fabricação sendo bem padronizado.

  1. Proteinas do liquido cefalorraqueano: II. Valores normais das frações proteicas obtidas por eletroforese (variações ligadas a cor, sexo e idade

    Directory of Open Access Journals (Sweden)

    Lucia M. Singer Vermes

    1983-03-01

    Full Text Available Mediante dosagens de proteínas totais e eletroforese sobre acetato de celulose de 213 amostras de LCR normal, obtidas por punção da cisterna magna, foram efetuados estudos para verificação de variações ligadas à cor, sexo e idade. Os resultados obtidos permitiram concluir que: 1. não existem diferenças ligadas à cor no proteinograma do LCR; 2. em crianças, os fatores sexo e idade não influem nos valores estudados; 3. as taxas de proteínas totais e frações protéicas do LCR normal de criança diferem das de homens e de mulheres; 4. em adultos ocorrem variações ligadas ao sexo no proteinograma do LCR; 5. em adultos, proteínas totais e todas frações protéicas, quando expressas em mg/100 ml, aumentam com o avançar da idade. Foram estabelecidas, para a metodologia usada, as taxas fisiológicas do proteinograma do LCR de crianças, homens e mulheres, separadamente.

  2. Decomposição estrutural da variação do emprego nos setores industriais no brasil entre os anos de 2000 e 2009

    Directory of Open Access Journals (Sweden)

    Carina Diane Nakatani-Macedo

    2015-08-01

    Full Text Available RESUMO O objetivo do presente artigo é analisar a variação de emprego nos setores industriais nos anos 2000-2009 para o Brasil. Utiliza-se a metodologia de insumo-pro­duto, através da decomposição estrutural da variação do emprego em efeitos de intensidade, de tecnologia, da demanda, do crescimento e total. Os principais resultados mostraram que entre os dois períodos estudados, houve um acréscimo de 4,39 milhões de vagas para o setor industrial que isoladamente foi responsável por, aproximadamente, 25% do resultado nacional. Dentre os efeitos estudados pode-se destacar o efeito crescimento e intensidade como principal responsável pelos resultados. Ao considerar o efeito total, os setores que apresentaram maior crescimento relativo no número de empregos foram os de alimentos e bebidas, artigos do vestuário e acessórios e construção civil. Os resultados obtidos permitiram concluir que houve um aumento do número de postos de trabalho para a indústria no Brasil no período analisado, onde a tecnologia, apesar de não explicar unicamente o efeito crescimento, mostra impactos positivos na geração de emprego no efeito total.

  3. Variações fisiológicas da pressão do líquido cefalorraqueano na cisterna magna

    Directory of Open Access Journals (Sweden)

    A. Spina-França

    1963-03-01

    Full Text Available É feito estudo de revisão das variações fisiológicas da pressão do LCR ao nível da cisterna magna (punção suboccipital. Em relação à série de 1.500 pacientes com afecções do sistema nervoso e sem sintomatologia de hipotensão ou de hipertensão intracraniana, a pressão média normal do LCR ao nível da cisterna magna foi de 11,9 cm de água (paciente calmo, decúbito lateral horizontal. As variações fisiológicas de pressão, segundo os achados, têm como limites os valôres de 4,1 e 19,7 cm de água. Êsses valôres permitem caracterizar, para a cisterna magna, a existência de hipotensão do LCR quando a pressão fôr menor ou igual a 4 cm de água; a hipertensão é caracterizada por valores iguais ou maiores do que 20 cm de água. A pressão do LCR ao nível da cisterna magna é menor do que no fundo de saco lombar. Para série de 276 pacientes o valor médio achado para êste último nível foi de 16,7 cm de água (decúbito lateral horizontal. A diferença entre as médias foi altamente significativa. Não foram verificadas modificações da pressão do LCR ao nível da cisterna magna que pudessem ser relacionadas ao sexo. Sem que representassem dados de interêsse para a prática, foram verificadas variações ligadas à côr e à idade dos pacientes. Em média a pressão do LCR se mostrou menor entre pacientes prêtos e amarelos que entre os brancos e os mulatos. Um declínio do valor médio da pressão foi verificado à medida em que aumentava a idade dos pacientes. Êste declínio mostrou-se maior para o grupo de pacientes com idade acima de 60 anos.

  4. Variação do volume de gotas de colírios lubrificantes disponíveis no mercado brasileiro

    Directory of Open Access Journals (Sweden)

    Vitorugo Silvestre Nascimento

    Full Text Available RESUMO Objetivo: Avaliar a variação intra e interexaminadores do volume de gotas dispensados de frascos de colírios lubrificantes disponíveis no mercado. Métodos: Foram estudados cinco frascos de colírios lubrificantes e dezenove voluntários participaram deste estudo. A massa média de gotas de 20µl dos colírios foi obtida utilizando micropipeta e balança de precisão e como padrão para comparação com a massa das gotas obtidas pelos voluntários. Cinco gotas de cada frasco foram pesadas individualmente com o tubo de colírio perpendicular à balança, usando o primeiro e segundo dedos da mão direita, de forma que a pressão fosse aplicada somente no meio do frasco. Os experimentos foram realizados em uma sala climatizada a temperatura ambiente (21±1°C. Resultados: Todos os frascos de colírios apresentaram variação estatisticamente significante das massas das gotas obtidas pelos examinadores quando comparadas com a massa média padrão de 0,0182±0,0014g, com exceção da comparação entre os dados do colírio A com o colírio D, que não apresentou variação estatisticamente significante. Conclusão: O presente estudo demonstra a ausência de uniformidade das gotas dispensadas pelos frascos de colírios disponíveis no mercado e a sua inadequação à real necessidade, uma vez que as gotas dispensadas são maiores do que o indicado. Esse fato torna-se um problema quando se trata de período de tratamento prolongado, especialmente com colírios dispendiosos como os indicados para a terapêutica do glaucoma. Nesse sentido, a padronização das gotas de colírios se faz necessária.

  5. Variação da toxidez de Arrabidaea bilabiata (Bignoniaceae em coelhos Variation of the toxicity of Arrabidaea bilabiata (Bignoniaceae in rabbits

    Directory of Open Access Journals (Sweden)

    Flávia F. Jabour

    2006-09-01

    Full Text Available A brotação e as folhas maduras dessecadas e trituradas de Arrabidaea bilabiata, um cipó ou arbusto escandente da família Bignoniaceae, foram administradas em suspensão aquosa por via intragástrica a 15 coelhos adultos nas doses que variaram de 0,25-6,0g/kg. Nos experimentos com a brotação coletada em outubro (fim da época de seca, a menor dose que causou a morte dos coelhos foi de 0,5g/kg e em maio (fim da época de cheia, a menor dose que causou a morte foi de 1,0g/kg. Já com as folhas maduras coletadas em outubro a menor dose que causou a morte dos coelhos foi de 4,0g/kg e em maio, a menor dose que causou a morte foi de 6,0g/kg. A evolução em todos os casos letais foi superaguda. Clinicamente os coelhos de súbito debatiam-se com força na gaiola, caiam em decúbito lateral ou esternal, faziam movimentos de pedalagem, apresentavam acentuada dispnéia e morriam. À necropsia não foram observadas alterações significativas e ao exame histopatológico as lesões mais importantes caracterizaram-se, nos rins, por degeneração hidrópico-vacuolar das células epiteliais dos túbulos contornados distais, no fígado por vacuolização difusa do citoplasma e necrose de hepatócitos, predominantemente centro-lobular e paracentral e presença de esférulas eosinofílicas nos sinusóides hepáticos, no coração, por grupos de fibras cardíacas com eosinofilia aumentada, além de congestão nos rins, fígado, coração e pulmão. Neste estudo ficou estabelecido que a toxidez de A. bilabiata varia de acordo com a época do ano e o estado de maturação, pois essa planta foi mais tóxica em outubro e quando em brotação, confirmando, assim, os dados obtidos previamente em bovinos e búfalos.The dried and powdered mature leaves and sprouts of Arrabidaea bilabiata (fam. Bignoniaceae, a liana or scandent shrub, were administered by stomach tube to 15 rabbits at doses of 0.25-6.0g/kg. The lowest dose of the sprouts collected in October (End of

  6. Dupla variação anatômica vascular em um único indivíduo: estudo morfométrico

    Directory of Open Access Journals (Sweden)

    Cristiane Regina Ruiz

    2017-12-01

    Full Text Available Introdução: Variações anatômicas são pequenas diferenças morfológicas congênitas que aparecem nos diferentes sistemas orgânicos, as quais não acarretam prejuízo ou distúrbio funcional para o indivíduo. No que diz respeito aos vasos sanguíneos, alterações no desenvolvimento embriológico podem gerar duplicidade de vasos, agenesia ou ocasionar o surgimento de artérias e o desembocar de veias fora da descrição anatômica padrão. Relato de caso: Foi observada dupla variação anatômica vascular em um indivíduo durante uma dissecação de rotina no Laboratório de Anatomia do Centro Universitário São Camilo. A artéria renal principal tinha origem na parte abdominal da artéria aorta seguindo até sua entrada no hilo renal, porém, em vez de um trajeto retilíneo a partir da aorta, a mesma possuía um trajeto descendente e bem angulado. A partir da artéria renal principal surgia uma artéria polar aberrante que entrava no polo inferior do rim direito. Em um nível mais inferior, na altura da bifurcação da aorta, originava-se outra artéria polar aberrante que entrava no hilo renal, seguindo um trajeto retilíneo até o polo inferior do rim direito. A artéria hepática comum originava-se no tronco celíaco seguindo até sua entrada na porta do fígado. A artéria mesentérica superior possuía origem no tronco celíaco. A artéria hepática direita originava-se na artéria mesentérica superior. Conclusão: O estudo das variações anatômicas constitui-se tarefa árdua em virtude das inúmeras expressões diferentes que ocorrem no corpo humano, porém, o conhecimento dessas variações é de extrema valia para a clínica e o planejamento cirúrgico, garantindo a precisão e evitando complicações pós-cirúrgicas ou diagnósticos errôneos.

  7. Waste level analysis in a care section with the lean maintenance method to minimize waste in PT. Varia Usaha Beton Gresik

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    Rochmoeljati Rr.

    2017-06-01

    Full Text Available The major problem faced by PT. Varia Usaha Beton Gresik is not the maintenance activity according to Standard Operation Procedure (SOP, but the activities conducted without taking into account the waste. The purpose of this study is to examine the waste in the maintenance activities as to minimize it by the lean maintenance method. This is taken on a conveyor belt weigher machine, a bucket conveyor, a concrete mixer, and a machine host. The variable is the flow of treatment by reducing waste and by giving recommendation of improvement. Data collection includes damage data, production data, product disability data, and maintenance activity data. The conclusion is QT-10 waste motion machine takes 532 minutes for waste repair, 45 minutes for waste process, and 90 minutes for waste waiting. Our recommendations include improvement on the information provided, on training and rewards, and on supervisors of the production line.

  8. Variação e contatos linguísticos do vestfaliano rio-grandense falado no Vale do Taquari

    OpenAIRE

    Aline Horst

    2014-01-01

    A presente Dissertação apresenta as etapas e os resultados de uma pesquisa que objetiva descrever os processos envolvidos na variação e constituição da língua brasileira de imigração alemã vestfaliano (We, também conhecida como sapato-de-pau, Plattdüütsch), identificando aspectos de sua configuração linguística e as territorialidades de uso e manutenção dessa língua em um contexto de plurilinguismo e de contato com variedades do português (Pt) e do alemão (Dt - Deutsch), sobretudo do Hunsrück...

  9. Somaclonal variation on in vitro callus culture potato cultivars Variação somaclonal in vitro em cultura de calos de cultivares de batata

    Directory of Open Access Journals (Sweden)

    Patricia N. Bordallo

    2004-06-01

    Full Text Available Synthetic seeds can be an alternative for those species in which botanical seeds are not viable. One of the major problems of in vitro plant cultivation is the high level of somaclonal variation. The most common factors affecting somaclonal variation are genotype, explant source, in vitro period and cultivation conditions in which the culture is established. In this work, calli were induced using leaf and stem explants of the commercial potato cultivars Achat, Baraka, Baronesa, Bintje, and Contenda in MS culture media supplemented with 1.65 mM of picloram and 11.5 mM of 2,4-D. Seventy and 90 days after induction, DNA samples of 40 calli were compared concerning the effects of the two explant (leaf and stem and two growth regulator sources on five potatoes cultivars. A total of 20 arbitrary sequence primers were evaluated. The RAPD pattern generated by these primers suggested a high percentage of polymorphic fragments among the five genotypes, indicating a high level of genetic variation among cultivars. Cultivar Baronesa showed the highest number of polymorphic fragments for all treatments. The cultivar Contenda showed the smallest somaclonal variation, for most of the treatments, except for the treatment which consisted of stem explants, picloram (1.65 mM application, and a 70-day period of callus formation. 'Contenda' is, therefore, the most suitable cultivar for synthetic seed production.A produção de sementes sintéticas pode ser uma altenativa para culturas, cuja produção de sementes botânicas não é viável. Um dos principais problemas do cultivo de planta in vitro é o alto nível de variação somaclonal resultante. Os fatores mais comuns que afetam a variação somaclonal são genótipo, fonte de explante e duração e condições de cultivo. Neste trabalho, calos foram induzidos utilizando explantes de folha e caule das cultivares comerciais de batata Achat, Baraka, Baronesa, Bintje e Contenda em meio de cultura MS, suplementado

  10. Caracterização do lenho e variação radial de Pittosporum undulatum Vent. (pau-incenso)

    OpenAIRE

    Longui, Eduardo Luiz; Romeiro, Diego; Silva, Morgana Tramontini da; Ribeiro, Ariane; Gouveia, Tatiana Cestini; Lima, Israel Luiz de; Florsheim, Sandra Monteiro Borges

    2011-01-01

    Estudou-se o lenho de Pittosporum undulatum do Parque Estadual Alberto Löfgren, objetivando-se sua caracterização, investigar a variação radial da anatomia e densidade básica, suas correlações e discutir os resultados em um contexto ecológico. Empregaram-se as metodologias usuais para anatomia e densidade da madeira. As características anatômicas corroboram com o descrito para o gênero, ressalta-se a presença de camadas de crescimento, não mencionada na literatura. O diâmetro das fibras não a...

  11. Fast Identification of Radical Scavengers from Securigera varia by Combining 13C-NMR-Based Dereplication to Bioactivity-Guided Fractionation.

    Science.gov (United States)

    Sientzoff, Pacôme; Hubert, Jane; Janin, Coralie; Voutquenne-Nazabadioko, Laurence; Renault, Jean-Hugues; Nuzillard, Jean-Marc; Harakat, Dominique; Magid, Abdulmagid Alabdul

    2015-08-14

    Securigera varia (Fabaceae) is a common herbaceous perennial plant widely growing in Europe and Asia and purposely established for erosion control, roadside planting, and soil rehabilitation. The aim of this study was to determine the radical scavenging activity of a crude methanol extract of S. varia aerial parts by using the free radical DPPH (1,1-diphenyl-2-picrylhydrazyl) and to rapidly identify the compounds involved in this activity. The crude extract was initially separated in five fractions on Diaion HP20 resin and the most active part was fractionated by Centrifugal Partition Extraction (CPE). Known compounds were directly identified by a (13)C-NMR-based dereplication method. Semi-preparative high performance liquid chromatography purification experiments were further performed to identify unknown or minor active compounds. As a result, one new (13) and twelve known flavonoid glycosides together with three nitropropanoylglucopyranoses were isolated, including astragalin (1), kaempferol-3-O-(6-O-acetyl)-β-D-glucopyranoside (2), kaempferol-3,4'-di-O-β-D-glucopyranoside (3), trifolin (4), isoquercitrin (5), hyperoside (6), isovitexin (7), isoorientin (8), isovitexin 4'-O-β-D-glucopyranoside (9), apigenin 7-O-β-D-glucuronopyranoside (10), luteolin 7-O-β-D-glucuronopyranoside (11), apigenin 7-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucuronopyranoside (12), apigenin 7-O-β-D-glucopyranosyl-(1 → 2)-β-D-glucuronopyranoside (13), 6-O-(3-nitropropanoyl)-β-D-glucopyranoside (14), coronillin (16) and coronarian (15). 120 mg of the most active compound isoorientin against the free radical DPPH was recovered by CPE with an HPLC purity of 99%.

  12. Fast Identification of Radical Scavengers from Securigera varia by Combining 13C-NMR-Based Dereplication to Bioactivity-Guided Fractionation

    Directory of Open Access Journals (Sweden)

    Pacôme Sientzoff

    2015-08-01

    Full Text Available Securigera varia (Fabaceae is a common herbaceous perennial plant widely growing in Europe and Asia and purposely established for erosion control, roadside planting, and soil rehabilitation. The aim of this study was to determine the radical scavenging activity of a crude methanol extract of S. varia aerial parts by using the free radical DPPH (1,1-diphenyl-2-picrylhydrazyl and to rapidly identify the compounds involved in this activity. The crude extract was initially separated in five fractions on Diaion HP20 resin and the most active part was fractionated by Centrifugal Partition Extraction (CPE. Known compounds were directly identified by a 13C-NMR-based dereplication method. Semi-preparative high performance liquid chromatography purification experiments were further performed to identify unknown or minor active compounds. As a result, one new (13 and twelve known flavonoid glycosides together with three nitropropanoylglucopyranoses were isolated, including astragalin (1, kaempferol-3-O-(6-O-acetyl-β-D-glucopyranoside (2, kaempferol-3,4′-di-O-β-D-glucopyranoside (3, trifolin (4, isoquercitrin (5, hyperoside (6, isovitexin (7, isoorientin (8, isovitexin 4′-O-β-D-glucopyranoside (9, apigenin 7-O-β-D-glucuronopyranoside (10, luteolin 7-O-β-D-glucuronopyranoside (11, apigenin 7-O-α-L-rhamnopyranosyl-(1→2-β-D-glucuronopyranoside (12, apigenin 7-O-β-D-glucopyranosyl-(1→2-β-D-glucuronopyranoside (13, 6-O-(3-nitropropanoyl-β-D-glucopyranoside (14, coronillin (16 and coronarian (15. 120 mg of the most active compound isoorientin against the free radical DPPH was recovered by CPE with an HPLC purity of 99%.

  13. Variação do incremento anual ao longo do fuste de Pinus taeda L. em diferentes idades e densidades populacionais.

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    César Martins Andrade

    2010-08-01

    Full Text Available A variação do crescimento anual em diferentes alturas do fuste de Pinus taeda L. foi estudada por meio da análise de tronco em árvores do estrato dominante e médio. Foram coletadas secções transversais ao longo do fuste de 9 árvores-amostra, tomadas na base, à altura do peito (DAP, e após, a cada metro. A amostragem foi constituída de 4 árvores provenientes de Canela, Rio Grande do Sul, em floresta com 17 anos de idade, submetida a um desbaste, e 5 árvores de Ponte Alta do Norte, Santa Catarina, em floresta com 34 anos, submetida a cinco desbastes. Os resultados, expressos na forma percentual do incremento em área basal na posição "i", sobre o incremento em área basal ao nível do DAP, mostraram a forte variação na deposição anual de lenho ao longo do fuste em função da densidade populacional, caracterizando os efeitos da competição e da liberação pela execução do desbaste. Árvores sujeitas à competição mostraram maior crescimento nas partes superiores do fuste, enquanto que árvores sob menor concorrência apresentaram maior crescimento em posições inferiores, facilmente identificadas pela forma e inclinação das curvas de incremento.

  14. Presence Management and Merging Presence Information for NGN Services

    Science.gov (United States)

    Schumann, Sebastian; Mikoczy, Eugen; Podhradsky, Pavol; Muruchi, Feliciano; Maruschke, Michael

    This paper describes an approach for interworking scenarios between Session Initiation Protocol (SIP) based and non SIP based frameworks (e.g. web services) in case of the presence management service. The characteristics of the concept of a centralized presence management will be introduced.

  15. Presence : concept, determinants and measurement

    NARCIS (Netherlands)

    IJsselsteijn, W.A.; Ridder, de H.; Freeman, J.; Avons, S.E.; Rogowitz, B.E.; Pappas, T.N.

    2000-01-01

    The concept of presence, i.e. the sensation of 'being there' in a mediated environment, has received substantial attention from the virtual reality community, and is becaming increasingly relevant both to broadcasters and display developers. Although research into presence is still at an early stage

  16. Fibromyalgia patients' quality of life and pain intensity variation Variação da intensidade da dor e da qualidade de vida de pacientes com fibromialgia

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    José Eduardo Martinez

    2008-12-01

    Full Text Available INTRODUCTION: One of the most reported issues on the Fibromyalgia syndrome is the pain intensity variation and its impact on patients' life quality. OBJECTIVES: 1 to establish the correlation among pain, anxiety and depression intensity perception; 2 to determine whether there is a correlation between pain intensity variation and the impact of fibromyalgia on patients' quality of life. MATERIAL AND METHODS: A study was carried out with 21 patients, who received a diary to register their perceptions on pain, anxiety and depression intensity. The patients have made this procedure three times a day, for a fifteen-day period. The impact on life quality was measured by the the Fibromyalgia Impact Questionaire (FIQ. RESULTS: It was observed a significant variation on pain intensity during the day periods. There was not a significant variation for anxiety and depression through the day periods. It was not observed any significant correlation between pain and depression or pain and anxiety intensity perception at any time of the day, during the study period. When considering the whole study period, it was observed that there was a correlation between pain and anxiety and pain and depression in the morning. CONCLUSION: It is concluded that there is a significant pain variation through the day periods and there is a correlation between pain and anxiety and pain and depression in the morning. There is a significant correlation of life quality with pain in the morning, anxiety in the afternoon and evening; and depression in all periods of the day.INTRODUÇÃO: Uma das questões mais relatadas é a variação da intensidade da dor no decorrer do dia e seu impacto na qualidade de vida. OBJETIVOS: Estabelecer a correlação entre a percepção da intensidade da dor, da ansiedade e da depressão e determinar a correlação entre a variação da intensidade da dor e o impacto na qualidade de vida. MATERIAL E MÉTODOS: Estudou-se 21 pacientes com fibromialgia. As

  17. Ajuste do rendimento para a variação do estande em experimentos de melhoramento genético do feijão Adjustment of the yield for the stand variation in common bean genetic breeding experiments

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    Clause Fátima de Brum Piana

    2007-12-01

    Full Text Available O objetivo deste trabalho foi avaliar o ajuste do rendimento pela variação do estande em experimentos de feijão e propor procedimento para ajustamento por análise de co-variação. Utilizaram-se dados de 33 ambientes do Ensaio Estadual de Feijão do Rio Grande do Sul. Realizaram-se as análises de variação e de co-variação de rendimento e de estande em cada ambiente. Foram considerados quatro modelos de ajustamento alternativos: sem ajuste para a variação do estande; com ajuste para o estande médio geral; com ajuste para os estandes médios dos genótipos; e com ajuste para os estandes médios dos grupos de genótipos. Em 70% dos ambientes, ocorreu efeito linear ou quadrático significativo de estande sobre rendimento e em 85% efeito significativo de genótipo sobre estande. O efeito compensatório manifestou-se com diferentes intensidades nos ambientes. O ajuste do rendimento para a variação do estande, considerando o efeito de genótipos sobre o estande, é importante em ensaios de melhoramento do feijão. É necessário o registro de informações que permitam discriminar a origem da variação do estande.The objective of this work was to evaluate the adjustment of the yield for the stand in common bean experiments and to propose a procedure for the adjustment through covariance analysis. Data from 33 environments of the Common Bean Assay of Rio Grande do Sul State, Brazil, were used. Variance and covariance analyses of yield and stand were proceeded for each environment. Four alternative models were considered: without adjustment for stand; with adjustment for the average stand; with adjustment for the genotypes average stand; and with adjustment for the groups of genotypes average stand. Significant linear or quadratic effects of stand on yield occurred in 70% of the environments and of genotype on stand in 85%. The compensatory effect was manifested with different intensities in the environments. The adjustment of the yield

  18. As variações da forma do sifão carotídeo na arteriografia cerebral: estudo sobre 120 casos não tumorais

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    A. Mattos Pimenta

    1954-06-01

    Full Text Available O estudo de 120 arteriogramas de pacientes em que foi comprovada a inexistência de lesão que ocupa espaço intracraniano, permitiu o reconhecimento de várias formas de sifão carotídeo normal. Foi assim possível fazer uma classificação anatômica dos vários tipos e concluir que a forma do sifão não permite, sozinha, fazer o diagnóstico topográfico de tumores intracranianos. É importante reconhecer exatamente os limites do sifão, a fim de localizar, precisamente, os aneurismas da carótida interna. Do exposto podemos tirar duas ordens de conclusões: 1 Conclusões anatômicas - O sifão carotídeo normal não apresenta grande número de variações de forma, podendo ser reconhecidos dois tipos básicos: angulados e arredondados. Os primeiros subdividem-se em angulados com ramos oblíquos (ângulo agudo ou ângulo obtuso e angulados com um ramo horizontal (superior ou inferior. Os segundos (arredondados dividem-se em três subtipos: semi-elíptico, em alça (horizontal ou oblíquo e em S (superior, inferior ou duplo. Nos grupos e subgrupos cada segmento do sifão pode apresentar variação no comprimento e espessura, como é evidente à observação dos esquemas. 2 Conclusões neurocirúrgicas - A existência de grande número de formas consideradas como normais de sifão carotídeo leva à conclusão de que não é possível basear o diagnóstico de tumor, ou melhor, de lesão que ocupa espaço intracraniano, exclusivamente pela imagem arteriográfica do sifão. As variações fisiológicas do sifão, somadas às das artérias do grupo silviano e da cerebral anterior, trazem dificuldades diagnosticas que obrigam o neurocirurgião a procurar o maior número de indícios para fazer a interpretação correta do exame. Assim sendo, na rotina neurocirúrgica é aconselhável que os arteriogramas sejam feitos pelo menos em duas posições: perfil e ântero-posterior. E' importante reconhecer bem os limites do sifão para se estabelecer

  19. Variação no conteúdo de beta-glucanas em cultivares brasileiros de aveia Beta-glucan content variation in brasilian oat cultivars

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    Roberta M. de SÁ

    2000-04-01

    Full Text Available Com o crescente interesse em alimentos funcionais e nutracêuticos, a aveia (Avena sativa L. tem se destacado, devido ao seu teor de fibras alimentares e principalmente às beta-glucanas. As (1,3(1,4-beta-D-glucanas, fibras alimentares na maioria solúveis, atuam na redução do colesterol em indivíduos com hipercolesterolemia. Existem estudos para determinar as causas de variação do teor desta fibra em aveia, porém, pouco se sabe sobre a aveia cultivada no Brasil. O objetivo deste trabalho foi verificar se existem diferenças no conteúdo de beta-glucanas entre cultivares brasileiros e se há variação na porcentagem desta fibra devido ao ano de cultivo. Os cultivares IAC7, UFRGS14, UPF16 e UPF17 (3 amostras de cada, e ainda três amostras do cultivar IAC7 para cada ano de cultivo (97 e 98, foram analisados segundo os métodos da AACC (American Association of Cereal Chemists. Os teores médios (peso seco de beta-glucanas foram 6,50% (IAC7, 4,30% (UFRGS14, 3,51% (UPF16 e 3,78% (UPF17, com erro padrão de ±0,084 e coeficiente de variação de 7,89 %. Observou-se efeito significativo dos cultivares (p=0,03 e grande variabilidade entre as amostras (p=0,0001. O cultivar IAC7 apresentou média de beta-glucanas de 5,11% em 97 e 6,50 % em 98 (erro padrão ±0,14; CV=10,53% e observou-se efeito significativo do ano de cultivo.With the increasing interest in functional foods and nutraceuticals, oats (Avena sativa L. have received special attention because of their dietary fiber contents, and specially of their beta-glucans. The mostly soluble dietary fibers (1,3(1,4-beta-D-glucans, reduce serum cholesterol in individuals with hypercholesterolemia. There are studies about the causes of variation in the contents of this fiber in oats, however, very little is known about Brazilian cultivars. The objective of this work was to verify if there were differences in the beta-glucan contents among brazilian cultivars and if there was variation in the

  20. TEACHERS’ ACCOUNTS OF LANGUAGE VARIATIONS Relatos de Professores sobre Variações Lingüísticas Não-Padrão

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    João A. Telles

    1998-02-01

    Full Text Available This paper focuses on teachers' stigmatizing perspectives of their students' nonstandard varieties of Portuguese. Theoretically, the study was grounded on Personal Construct Psychology, Perspective Transformation in Teacher Education, Transformative Bidialectalism and Critical Language Awareness. The objectives were to jointly access and assess the teachers’ implicit theories about nonstandard language and to verify to what extent these theories affected their classroom pedagogy. My research questions turned to how the participating teachers understood nonstandard language; and to how their understandings are reflected on their language teaching. The viewing of the teachers’ videotaped classes and Repertory Grid activities inspired reflective conversations with the two teacher participants on their language and classroom experiences. These conversations were audio-recorded, transcribed and their analysis followed the thematizing approach of Hermeneutic Phenomenology. The study revealed teachers’ implicit theories about language variation defining pedagogies based on deficit and standard grammar perspectives. These pedagogies are in constant interaction with the teachers’ lived experiences, the contextual restrictions of schools and the limitations of teacher education programs.O presente trabalho trata das perspectivas estigmatizantes que duas professoras de língua portuguesa trazem em relação às variações lingüísticas não-padrão de seus alunos. Teoricamente, meu estudo se embasa na Psicologia dos Construtos Pessoais, Transformação de Perspectivas na Educação de Professores, Bi-dialetalismo Transformador e Sensibilidade Crítica à Linguagem. Meus objetivos foram acessar e ponderar sobre as teorias implícitas das professoras sobre linguagem não-padrão e verificar como tais teorias afetam suas pedagogias. Suas aulas foram gravadas em vídeo e atividades com Mapas do Repertório de seus conceitos sobre língua portuguesa

  1. Variação sazonal do fluxo de calor no solo dentro de um manguezal tropical Seazonal variation of soil heat flux within tropical mangrove

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    Marcos A. L. Moura

    2010-03-01

    Full Text Available Os manguezais são ecossistemas de grande importância em virtude da sua biodiversidade, embora ainda pouco estudados. O fluxo de calor no solo (FCS é uma propriedade que interfere no microclima de um ecossistema e depende de vários fatores. Um estudo experimental foi realizado em um manguezal no município de Marechal Deodoro, Alagoas, no período de outubro/2004 a outubro/2005, com o objetivo de caracterizar a variação sazonal do FCS; para isto, uma estação meteorológica automática foi montada em uma torre micrometeorológica para registrar diferentes elementos do tempo e clima, de forma contínua. Especificamente, para medição do FCS a 10 cm de profundidade utilizou-se uma bateria de três fluxímetros modelo HFT3 (Campbell Scientific, EUA no sentido de que a interferência da não uniformidade do solo nas medições fosse minimizada. Os resultados obtidos demonstraram influência da radiação solar, precipitação e da maré sobre a variação diária e sazonal do FCS, além de grande diferença de amplitude diária do FCS entre os períodos chuvoso (9 W m-2 e seco (36 W m-2.Mangrove swamps are highly important ecosystems due to their biodiversity, but they still are little studied. Soil heat fluxes (SHF is one of the proprieties that interfere in the ecosystem microclimate and depends on lots of factors. An experimental study was carried out in a mangrove forest in the Marechal Deodoro city, in the State of Alagoas, from October/2004 to October/2005, with the aim of describing the SHF seasonal variation. To this end, an automatic weather station was assembled in a micrometeorological tower to register the data continuously. To measure SHF in 10 cm depth one battery with three (3 fluximeter model HFT3 (Campbell Scientific, EUA was used so that the soil uniformity interference in the measurements was reduced. The obtained results showed influence of solar radiation, rainfall and tidal wave in the daily and seasonal SHF variation. A

  2. Músculo pronador redondo: variações anatômicas e predisposição para a compressão do nervo mediano Pronator teres muscle: anatomical variations and predisposition for the compression of the median nerve

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    Vilma Clóris de Carvalho

    2002-05-01

    Full Text Available O nervo mediano pode ser comprimido em nível de músculo pronador redondo (MPR, resultando na síndrome do pronador redondo. Objetivou-se analisar a constituição do MPR e sua relação com o nervo mediano na dissecação de 100 membros superiores humanos, oriundos de laboratórios de anatomia. Em 72% dos casos, o nervo mediano passou entre as cabeças umeral e ulnar do MPR. Em 15% a cabeça ulnar esteve ausente, com o nervo mediano passando posteriormente a cabeça umeral ou através dela. Em 9% a cabeça ulnar se fez representar por um feixe fibroso. Em 2% o nervo mediano passou através da cabeça ulnar e em 2% através da cabeça umeral, mesmo na presença da cabeça ulnar. Os dados sugerem que as variações na relação músculo/nervo representam fatores potenciais para a compressão do nervo mediano, por tornarem mais restrita a passagem desse nervo no antebraço.The median nerve can be compressed at the level of pronator teres muscle (PTM, resulting in the pronator teres syndrome. This work aim was to analyze the PTM and its relationship with the median nerve. In order to do so, we have dissected 100 human upper limbs from anatomy laboratories. In 72% of the cases, the median nerve passed between the umeral and ulnar heads of PTM. In 15% of the cases, the ulnar head was absent, with the median nerve passing behind the umeral head or through it. In 9%, a fibrous bundle represented the ulnar head. In 2%, the median nerve passed through the ulnar head and in 2% through the umeral head, even in the presence of the ulnar head. The data suggest that the variations in the relationship muscle/nerve represent potential factors for the median nerve compression, for they make the passage for this nerve in the forearm even narrower.

  3. Simulação da Variação do Espaçamento na Viabilidade Econômica de um Sistema Agroflorestal

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    Sidney Araujo Cordeiro

    2017-11-01

    Full Text Available RESUMO O objetivo deste estudo foi realizar simulação, verificando a rentabilidade de um sistema agrossilvicultural composto por eucalipto, arroz, soja e gado, de acordo com a variação do espaçamento de plantio do eucalipto e dos sistemas agroflorestais, bem como comparar os resultados com o plantio convencional do eucalipto. A análise econômica foi realizada mediante os métodos de avaliação de projetos florestais, Valor Presente Líquido (VPL, Benefício Periódico Equivalente (BPE, Razão Benefício/Custo (B/C e Taxa Interna de Retorno (TIR. Todos os projetos analisados apresentaram-se viáveis economicamente, sendo que o eucalipto em monocultivo apresentou melhores resultados. Verificou-se que o ganho em área com plantio das culturas agrícolas e criação de gado não obtém o mesmo retorno econômico caso a área estivesse com plantio de árvores.

  4. Variação na qualidade culinária das raízes de mandioca Culinary quality variation in cassava roots

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    José Osmar Lorenzi

    1994-01-01

    Full Text Available A falta de regularidade na qualidade culinária das raízes de mandioca de mesa é um dos fatores de restrição à expansão de seu consumo. Raízes cozidas de boa qualidade, entre outras características, devem apresentar-se, quando esmagadas por um garfo, na forma de uma massa não encaroçada, plástica e não pegajosa. O tempo de cozimento culinário correlaciona-se bem com a qualidade da massa cozida, isto é, quanto menor esse tempo, melhor a massa gerada. Dessa forma, neste trabalho, a duração do tempo de cozimento (DTC foi usada como método indireto e expedito para avaliação da qualidade culinária das raízes de mandioca. Os fatores que interferem na DTC podem ser reunidos em dois grupos: (a intrínsecos: variação dentro e entre raízes da mesma planta e entre plantas da mesma variedade; (b extrínsecos: variação em função do genótipo, do ambiente e do estado fisiológico das plantas. Estudos preliminares realizados pelo Instituto Agronômico (IAC tiveram por objetivos verificar e quantificar a magnitude dessas variações. Foram desenvolvidos dois experimentos de campo, em dois solos distintos, utilizando cinco variedades amostradas mensalmente, do 7.° ao 15.° mês de idade das plantas. A DTC foi determinada a partir de água fervente, em subamostras de cada raiz da planta. Os resultados mais relevantes mostraram que: (a a DTC diminuiu, de 10 a 14 minutos, da base para a ponta da raiz; (b a amplitude média de variação entre as raízes de uma mesma planta foi de 11, 10 e 27 minutos, respectivamente, para plantas com 8, 12 e 15 meses; (c houve diferenças na DTC para variedades (9 minutos e para tipos de solo (17 minutos; (d o efeito médio de época de colheita foi de 19 minutos. O período de menor DTC foi do 7.° ao 12.° mês de idade das plantas.Irregular culinary quality of cassava roots has been one of the major point that restricts its expansion for human consumption. A good quality cassava root, after cooking

  5. Variação intraespecífica do lenho de Eugenia uniflora L. em duas diferentes fitofisionomias do complexo vegetacional atlântico

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    Priscila Alves Marques

    Full Text Available Myrtaceae está entre as principais famílias lenhosas da Floresta Atlântica, destacando-se Eugenia L. como o gênero de maior riqueza de espécies na família. Eugenia uniflora L. apresenta grande representatividade em áreas de restinga, seu ambiente natural, e é amplamente cultivada em outras regiões em função da sua importância econômica. Este estudo investigou a anatomia do lenho de E. uniflora, crescendo em duas fitofisionomias do complexo vegetacional atlântico no Estado do Rio de Janeiro. Dezesseis parâmetros anatômicos foram analisados e revelaram que os elementos celulares dos indivíduos de restinga apresentam maior frequência e são mais curtos e mais largos, e os raios mais baixos e largos do que os dos indivíduos crescendo na Floresta Ombrófila Densa. Os resultados mostraram como as condições ambientais influenciam a estrutura anatômica da madeira e indicam variações intraespecíficas da espécie e de seus mecanismos de adaptação e de sobrevivência no complexo Mata Atlântica.

  6. Estudo da massa específica básica e da variação dimensional da madeira de três espécies de eucalipto para a indústria moveleira

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    Camila Santos Doubek Lopes

    2011-06-01

    Full Text Available A utilização da madeira de árvores de espécies de reflorestamento pela indústria moveleira tem apresentado tendência de crescimento nos últimos anos. Nesse sentido, no presente trabalho foram determinadas a massa específica básica e variação dimensional da madeira de árvores de Eucalyptus grandis, Eucalyptus dunnii e Eucalyptus urophylla, de 18 anos, para a aplicação como componentes de madeira maciça em movelaria. Os ensaios laboratoriais para a avaliação da massa específica básica e da variação dimensional da madeira nos sentidos radial e longitudinal do tronco das árvores de eucaliptos foram realizados de acordo com a NBR 7190/96. Os resultados da análise da madeira das espécies de eucalipto foram submetidos ao Teste de Homogeneidade, Análise de Variância, Teste de Tukey e Correlação de Pearson e comparados com o desempenho da madeira de sucupira (Bowdichia nitida e de cumaru (Dipteryx odorata utilizadas na indústria moveleira. Verificou-se para a madeira de Eucalyptus grandis menor valor de variação dimensional, sendo a mais indicada para componentes de móveis que exigem elevada estabilidade dimensional, além de peças de maior superfície. A madeira dessa espécie apresentou índice de variação dimensional compatível com o de espécies nativas utilizadas na indústria moveleira. Verificou-se, ainda, variação radial das propriedades da madeira, com alta correlação entre a massa específica básica e a variação dimensional. No sentido longitudinal, a base do tronco das árvores de eucalipto mostrou-se com a região de madeira de maior estabilidade dimensional.

  7. Ocorrência do pólen de Podocarpus sp. (Podocarpaceae nas coletas de Frieseomelitta varia Lepeletier 1836 (Apidae: Meliponinae em uma área de Manaus, AM, Brasil Occurrence of Podocarpus sp. (Podocarpaceae pollen on Frieseomelitta varia Lepeletier 1836 (Apidae: Meliponinae in Manaus, Amazonas, Brazil

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    Antonio Carlos Marques-Souza

    2010-06-01

    Full Text Available Durante o período de doze meses, o pólen transportado por Frieseomelitta varia Lepeletier 1836 foi coletado das corbículas das operárias, logo após o fechamento da entrada das colméias. Feita a identificação polínica dos grãos de pólen e sua frequência mensal nas amostras, constatou-se que as espécies das famílias mais visitadas pela ordem de coleta, foram: Cecropiaceae, Sapotaceae, Myrtaceae e Moraceae. As operárias coletaram o pólen de 79 espécies de plantas distribuídas em 60 gêneros e 37 famílias, sendo as mais frequentes: Cecropia sp. visitada o ano todo com atratividade em janeiro de 82,03%, Morus sp. com atratividade de 37,46% em dezembro; Myrcia amazonica DC. com atratividade em abril de 32,34% e Pouteria macrophylla (A.DC. Eyma em junho com atratividade de 36,54%. Quanto a Podocarpus sp. esse é o primeiro relato da presença do pólen dessa espécie em coletas de meliponíneos, o que não deixa de ser um fato curioso, uma vez que se trata de uma gimnosperma encontrada em áreas específicas da região amazônica e que apresentou atratividade para Frieseomelitta varia Lepeletier 1836 de 4,94% no mês de março.Over a 12 month period, pollen was sampled from the corbiculae of workers of the stingless bee Frieseomelitta varia Lepeletier 1836. Collections were obtained immediately after sealing the hives, located in a forest fragment in the city of Manaus. Pollen was identified and monthly frequency of each type was tallied. The most-visited plant families in decreasing order of frequency were Cecropiaceae, Sapotaceae, Myrtaceae and Moraceae. Identified pollen was harvested from 79 plant species in 60 genera and 37 families. The most frequent species were: Cecropia sp., visited year-round but with highest attractiveness (82% in January; Morus sp., with peak attractiveness (37% in December; Myrcia amazonica DC. with 32% peak attractiveness in April; and Pouteria macrophylla (A.DC. Eyma, with 37% peak attractiveness in

  8. Proteinas do liquido cefalorraqueano: III. Valores normais das imuneglobulinas G, A e M (variações ligadas a cor, sexo e idade

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    Lucia M. Singer Vermes

    1983-03-01

    Full Text Available É apresentada inicialmente revisão de literatura a respeito dos resultados obtidos na determinação das taxas de imuneglobulinas do LCR normal, mediante diferentes métodos, assim como da influência dos fatores cor, sexo e idade, nestes valores. Mediante imunodifusão radial foram determinados os níveis de IgG, IgA e IgM do LCR normal de 115, 78 e 45 pessoas, respectivamente. Todas as amostras de LCR foram obtidas por punção sub-occipital (LCR-SO. Os resultados destas determinações permitiram concluir que: a as taxas médias de IgG, IgA e IgM do LCR de pretos ou pardos não diferem daquelas de brancos; b não existem variações ligadas ao sexo, nem à idade, em crianças com 1 a 11 anos, nas taxas das imuneglobulinas estudadas, no LCR; c os níveis fisiológicos em crianças com 1 a 11 anos, para IgG variam entre 0,21 e 2,93 mg/100 ml; os teores absolutos médios de IgG de crianças são inferiores àqueles encontrados em adultos; os níveis percentuais médios de IgG de crianças não diferem daqueles de adultos; d as taxas de IgA do LCR de crianças, tanto em valores absolutos como relativos, são, em média, inferiores àquelas encontradas em adultos, não ultrapassando, em condições normais, 0,15 mg/100 ml (0,7% do total protéico; e em adultos, não se observam variações ligadas ao sexo, nem à idade, nos níveis das imuneglobulinas estudadas, no LCR-SO; as taxas normais de IgG encontradas no LCR-SO de adultos são de 0,51 a 4,00 mg/100 ml; em crianças e adultos, as taxas fisiológicas desta imuneglobulina, em termos percentuais, são de 3 a 12%; o LCR-SO normal de adultos contém IgA em concentrações de até 0,32 mg/100 ml (0,9% do total protéico; f a IgM encontra-se no LCR-SO normal, tanto de crianças como de adultos, em níveis muito baixos, não ultrapassando 0,2 mg/100 ml (0,25% do total protéico.

  9. Breathing life into social presence

    DEFF Research Database (Denmark)

    Cowley, Stephen; Fester, Marie-Theres

    2018-01-01

    Whilst many studies focus on human-to-media interactions, this paper turns to how a multimodal medium influences human-to-human contact. By bringing together both radical embodied cognitive science (Chemero 2009) and dialogism (Linell 2009), the paper develops an anti-representationalist approach...... to the concept of social presence. We use an exploratory study of close friendships that maintain their interaction through the use of the mobile instant messaging service WhatsApp. In so doing, we describe texting as language-activity where people engage with each other by using resources from body, environment...... attention to this kind of heightened social presence that we choose to call “co-imagining”....

  10. Ciemat Relational Capital: Institutional Presence

    International Nuclear Information System (INIS)

    Vaquero Ortiz, E. M.; González Pineda, L. M.; Cascante Díaz, E.

    2015-01-01

    The resources in any organization for its activity development can be divided into two main groups: tangible assets and intangible assets. In recent decades there has been a recognition of the importance of the intangible assets as value generators for the development and growth of organizations. And the so called Relational Capital is among them Relational Capital arises from the relationship processes that an organization maintains with external agents. Thus, in the case of a public research institution, such as CIEMAT, it includes the relations with projects financing organizations, with partners and with customers (both public and private entities which are serviced), as well as the institutional presence understood as the participation in discussion and coordination forums (foundations, associations, committees…). This report presents a study of CIEMAT institutional presence in the year 2015.

  11. Associação entre dois diferentes tipos de estrangulamento com a variação da pressão intraocular em atletas de jiu-jitsu

    OpenAIRE

    Scarpi,Marinho Jorge; Conte,Marcelo; Rossin,Reginaldo Alexandre; Skubs,Renato; Lenk,Rudolf Eberhard; Brant,Rodrigo

    2009-01-01

    OBJETIVO: Verificar a associação entre dois diferentes tipos de estrangulamento com a variação da pressão intraocular em atletas de jiu-jitsu. MÉTODO: Estudo observacional em grupo de 9 atletas de jiu-jitsu, com mínimo 6 meses de treinamento, sexo masculino, idades entre 20 e 30 anos, sem presença de lesões físicas e do bulbo ocular. Buscou-se associação entre a variação da pressão intraocular e os estrangulamentos Frontal da Guarda (E1) e Frontal da Montada (E2). A pressão intraocular foi de...

  12. Ophiuroidea das regiões antartica e subantartica: 2. variação em Gorgonocephalus chílensis (Philippi (Echinodermata, Ophiuroidea, Gorgonocephalidae Ophiuroidea from antarctic and subantarctic regions: 2. variation on Gorgonocephalus chilensis (Philippi (Echinodermata, Ophiuroidea, Gorgonocephalidae

    Directory of Open Access Journals (Sweden)

    Ana Maria Gouveia Monteiro

    1983-01-01

    Full Text Available Foram examinados 198 exemplares de Gorgonocephalus chilensis das regiões antártica e subantartica, tendo-se em vista a variação de caracteres morfológicos externos. Foi constatada uma grande variação nas características morfológicas externas, que parece independer de localização geográfica.A revision is presented on the variability of the ornamentation and other extermal morphological aspects of Gorgonocephalus chilensis. The samples were obtained along the period of 1962 to 1972 by the R/V "Hero" and "Eltanin" (USARP and by the R/V "Almirante Saldanha" from the Brazilian Navy.

  13. Measuring Presence in Virtual Environments

    Science.gov (United States)

    1994-10-01

    viewpoint to change what they see, or to reposition their head to affect binaural hearing, or to search the environment haptically, they will experience a...increase presence in an alternate environment. For example a head mounted display that isolates the user from the real world may increase the sense...movement interface devices such as treadmills and trampolines , different gloves, and auditory equipment. Even as a low end technological implementation of

  14. Influência da icterícia colestática na variação ponderal em modelo experimental

    Directory of Open Access Journals (Sweden)

    Leonardo de Souza Vasconcellos

    Full Text Available OBJETIVO: Avaliar a influência da icterícia colestática na variação ponderal. MÉTODOS: Foram utilizados 64 ratos adultos, distribuídos em seis grupos: F1 (n=6 - fêmeas normais, F2 (n=6 - fêmeas laparotomizadas, F3 (n=20 - fêmeas ictéricas, M1 (n=6 - machos normais, M2 (n=6 - machos laparotomizados, M3 (n=20 - machos ictéricos. A icterícia foi obtida com ligadura e secção do ducto biliopancreático. Os pesos dos animais foram registrados semanalmente, durante sete semanas. No 14º dia de experimento, dosaram-se as bilirrubinas séricas e os hormônios gonadais. Após a sétima semana, realizou-se estudo histológico do fígado. RESULTADOS: Os animais dos grupos F3 e M3 apresentaram bilirrubinas elevadas e diminuição da massa corpórea, quando comparados com os demais grupos. As diferenças ponderais foram significativas a partir da quarta semana entre as fêmeas e da quinta semana entre os machos. Nos animais ictéricos houve aumento do estradiol e diminuição da progesterona e da testosterona total. Septos de fibroses perivenular e periportal, colangite e hiperplasia de ductos biliares ocorreram no fígado dos animais ictéricos. Nenhum animal apresentou cirrose. CONCLUSÃO: Ocorreu redução do peso corpóreo murino em presença de icterícia colestática em ambos os sexos.

  15. Evaluación de varias técnicas de extracción de ADN de Cryptococcus spp. a partir de muestras ambientales.

    Directory of Open Access Journals (Sweden)

    Alexandra Castañeda

    2004-09-01

    Full Text Available El género Cryptococcus comprende, al menos, 38 especies, pero sólo 3 se han informado como patógenas para el hombre y los animales: Cryptococcus laurentii, Cryptococcus albidus y Cryptococcus neoformans; esta última es la más frecuente. La infección se adquiere por la inhalación de los propágulos infectantes del medio ambiente. Los estudios del hábitat se han realizado con técnicas de extracción con soluciones tampón y cultivos en medios selectivos. El objetivo del trabajo fue evaluar varias técnicas de extracción del ADN de Cryptococcus spp. a partir de muestras ambientales. Como controles se emplearon aislamientos de C. neoformans, C. albidus, C. laurentii y Paracoccidiodes brasiliensis. Se emplearon vermiculitas, suelos contaminados en el laboratorio con 10 a 106 blastoconidias/g y muestras naturalmente colonizadas con C. neoformans. El ADN se extrajo con métodos físicos, químicos y con un estuche comercial, y se purificó usando bloques de agarosa y columnas de sílica. Para la amplificación con PCR se emplearon los iniciadores CN4-CN5 específicos para C. neoformans. Sólo el estuche comercial permitió extraer y purificar el ADN de las muestras de suelos contaminados hasta una concentración de 10 blastoconidias/g de suelo y de una de las muestras naturalmente colonizadas. Con este trabajo se logró la extracción y amplificación de ADN de Cryptococcus spp. a partir de muestras ambientales lo cual constituye una herramienta importante para delimitar las áreas ecológicas de C. neoformans en nuestro país.

  16. Ancoragens e variações nas representações sociais da corrupção Anchoring and variations in the social representations of corruption

    Directory of Open Access Journals (Sweden)

    Gabrielle Poeschl

    2010-01-01

    Full Text Available Examinam-se neste artigo as representações da corrupção de inquiridos portugueses e procuram-se identificar variações consoante os grupos sociais e os contextos geral, global ou nacional em que o fenómeno é considerado. Verificou-se que a “corrupção em geral” é representada por práticas e motivos que reflectem um julgamento moral e por grupos e actividades ilegais, tal como acontece em relação à corrupção ao nível global. Esta tem ainda uma dimensão geopolítica, enquanto a corrupção ao nível nacional é entendida de forma particularizada, realçando-se casos e situações específicas muitas vezes divulgados pelos media.In this paper, we examine the representations of corruption of Portuguese respondents and attempt to identify variations according to different social groups and to the general, global, or national contexts in which the phenomenon is considered. We found that “corruption, in general”, is represented by practices and motives that reflect a moral judgment, and by illegal groups and activities, as is also the case for corruption at the global level. Corruption at the global level also has a geopolitical dimension, whereas corruption at the national level is seen in a particularized way, highlighting cases and situations often debated in the media.

  17. Improving yield and water use efficiency of apple trees through intercrop-mulch of crown vetch (Coronilla varia L.) combined with different fertilizer treatments in the Loess Plateau

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, W.; Li, Y.; Gong, Q.; Zhang, H.; Zhao, Z.; Zheng, Z.; Zhai, B.; Wang, Z.

    2016-07-01

    Improving water use efficiency (WUE) and soil fertility is relevant for apple production in drylands. The effects of intercrop-mulch (IM) of crown vetch (Coronilla varia L.) combined with different fertilizer treatments on WUE of apple trees and soil fertility of apple orchards were assessed over three years (2011, 2013 and 2014). A split-plot design was adopted, in which the main treatments were IM and no intercrop-mulch (NIM). Five sub-treatments were established: no fertilization (CK); nitrogen and phosphorus fertilizer (NP); manure (M); N, P and potassium fertilizer (NPK); and NPK fertilizer combined with manure (NPKM). Due to mowing and mulching each month during July–September, the evapotranspiration for IM was 17.3% lower than that of NIM in the dry year of 2013. Additionally, the soil water storage of NPKM treatment was higher than that of CK during the experimental period. Thus, single fruit weight and fruit number per tree increased with IM and NPKM application. Moreover, applying NPKM with IM resulted in the highest yield (on average of three years), which was 73.25% and 130.51% greater than that of CK in IM and NIM, respectively. The WUE of NPKM combined with IM was also the highest in 2013 and 2014 (47.69 and 56.95% greater than applying IM alone). In addition, due to application of IM combined with NPKM, soil organic matter was increased by 25.8% compared with that of CK (in NIM). Additionally, application of IM combined with NPKM obtained more economic net return, compared to other combinations. Therefore, applying NPKM with IM is recommended for improving apple production in this rain-fed agricultural area.

  18. Expansão urbana e variações mesoclimáticas em João Pessoa, PB

    Directory of Open Access Journals (Sweden)

    Liése Carneiro Sobreira

    Full Text Available A cidade de João Pessoa, na Paraíba, vem sendo submetida, nos últimos anos, a um forte crescimento urbano. Nesse contexto, este trabalho verificou entre as décadas de 1980 e 2000 variações climáticas significativas que possam ser correlacionadas com o crescimento urbano. Para tanto, utilizaram-se imagens de satélite nos anos de 1977 e 2009 para o cálculo da área edificada, bem como foram utilizadas séries de dados das variáveis climáticas: precipitação pluviométrica e temperatura do ar, colhidas em duas estações instaladas na malha urbana, e uma terceira, tomada como estação de referência, fora da malha urbana. Para a caracterização do crescimento da cidade, utilizaram-se dados quantitativos da população residente constantes dos censos demográficos de 1872 a 2009. Para a verificação do ritmo do comportamento da série temporal de temperatura e precipitação foram gerados gráficos da temperatura média e do acumulado mensal dos meses correspondentes aos trimestres mais quentes e menos quentes do período de 1984 a 2008. Dos resultados obtidos do tratamento e análise dos dados pode-se verificar que a temperatura do ar da cidade aumentou nos últimos 26 anos, havendo-se detectado que as temperaturas do ar sofreram elevações mais expressivas nos meses do trimestre mais quente, fato que pode ser correlacionado com a expansão da malha urbana.

  19. Variação sazonal na prevalência de distúrbios hipertensivos da gestação entre primigestas do sul do Brasil

    Directory of Open Access Journals (Sweden)

    Janete Vettorazzi

    2016-05-01

    Full Text Available Introdução: A hipertensão é uma das mais graves patologias gestacionais, levando a um aumento importante da morbimortalidade materna e perinatal. Este estudo teve como objetivo determinar a correlação entre o número de internações hospitalares em primigestas com distúrbios hipertensivos na gestação e variação sazonal. Métodos: Estudo prospectivo ecológico entre todas as primigestas com idade gestacional maior de 20 semanas que internaram no Centro Obstétrico do Hospital de Clínicas de Porto Alegre num período de 12 meses. A frequência de internações por distúrbios hipertensivos foi comparada nos diferentes meses e estações do ano e também em relação à temperatura média e mínima do dia da internação e da semana anterior. Resultados: Foram estudadas 1.327 primigestas com idade média de 20,7 anos e idade gestacional média de 38,6 semanas. Entre estas, 232 (17,5% apresentaram alteração na pressão arterial, sendo que 9,7% apresentaram pré-eclâmpsia (PE e 7,5% outros distúrbios hipertensivos da gestação. Não houve associação significativa entre a frequência de internações por distúrbios hipertensivos e a temperatura média ou mínima do dia ou da semana anterior à internação. Ao longo do ano, ocorreu variação significativa (p < 0,05 na frequência de internações por pré-eclâmpsia, sendo esta maior no mês de setembro (15,1% das internações, marcando a transição entre o inverno e primavera. Conclusão: As variações da temperatura têm influência no número de internações por hipertensão na gestação, sendo essa informação útil no planejamento do sistema de saúde e da disponibilidade de leitos hospitalares.    Introduction: Hypertension is one of the most severe pregnancy disorders, leading to a significant increase of maternal and perinatal morbidity and mortality. This study aimed to determine the correlation of the number of hospital admissions of primiparous women with

  20. Variação lingüística e alfabetização: um estudo com crianças da primeira série do ensino fundamental

    Directory of Open Access Journals (Sweden)

    Sylvia Domingos Barrera

    Full Text Available A pesquisa teve como objetivo investigar a influência da variação lingüística sobre a aquisição da linguagem escrita. Participaram da pesquisa 65 alunos de três classes da primeira série de uma escola pública de ensino fundamental. O material utilizado para avaliar o nível de variação lingüística das crianças foi aplicado no início do ano escolar. As provas utilizadas para avaliar os níveis de leitura e escrita foram aplicadas no início e final do ano letivo. A análise estatística mostrou correlação negativa significativa entre os níveis iniciais de variação lingüística e o desempenho final das crianças em leitura, sugerindo que a utilização de linguagem não-padrão pelos alunos pode dificultar o processo de alfabetização, sobretudo quando não trabalhada adequadamente pelas professoras. Os resultados obtidos sugerem a importância de uma efetiva difusão dos conhecimentos lingüísticos e sociolingüísticos, através dos cursos de formação de professores alfabetizadores.

  1. Variação anatômica radial do lenho de açoita-cavalo (Luehea divaricata) e sua influência na densidade aparente. Radial variation of wood anatomy in açoita-cavalo (Luehea divaricata) and its influence on the specific gravity.

    OpenAIRE

    Eduardo Luiz LONGUI; Israel Luiz de LIMA; Sandra Monteiro Borges FLORSHEIM; Alaor BUFOLO

    2009-01-01

    Variações entre as dimensões e frequênciasdas células da madeira existem entre espéciesdiferentes, entre indivíduos da mesma espécie ouainda dentro da mesma árvore nas direções radial eaxial. Essa variação influencia diretamente nadensidade aparente e consequentemente no uso dasdiferentes madeiras. O presente estudo determinoua variação anatômica radial e sua influência nadensidade aparente no lenho de árvores de Luehea divaricata, a partir de amostras coletadas no DAP,por meio de método dest...

  2. Sonic Virtuality, Environment, and Presence

    DEFF Research Database (Denmark)

    Grimshaw, Mark

    2018-01-01

    The article presents a brief introduction to the concept of sonic virtuality, a view of sound as a multi-modal, emergent perception that provides a framework that has since been used to provide an explanation of the formation of environments. Additionally, the article uses such concepts to explain...... the phenomenon of presence, not only in virtual worlds but also in actual worlds. The view put forward is that environment is an emergent perception, formed from the hypothetical modelling of salient worlds of sensory things, and it is in the environment that we feel present. The article ends with some thoughts...

  3. Family presence at resuscitation attempts.

    Science.gov (United States)

    Jaques, Helen

    UK resuscitation guidelines suggest that parents and carers should be allowed to be present during a resuscitation attempt in hospital but no guidance is available regarding family presence when resuscitation takes place out of hospital. A new research study has suggested that relatives who were offered the opportunity to witness resuscitation were less likely to develop symptoms of post-traumatic stress disorder than those who were not given the chance. This article summarises the results of this study and provides an expert commentary on its conclusions.

  4. Modeling co-occurrence of northern spotted and barred owls: accounting for detection probability differences

    Science.gov (United States)

    Bailey, Larissa L.; Reid, Janice A.; Forsman, Eric D.; Nichols, James D.

    2009-01-01

    Barred owls (Strix varia) have recently expanded their range and now encompass the entire range of the northern spotted owl (Strix occidentalis caurina). This expansion has led to two important issues of concern for management of northern spotted owls: (1) possible competitive interactions between the two species that could contribute to population declines of northern spotted owls, and (2) possible changes in vocalization behavior and detection probabilities of northern spotted owls induced by presence of barred owls. We used a two-species occupancy model to investigate whether there was evidence of competitive exclusion between the two species at study locations in Oregon, USA. We simultaneously estimated detection probabilities for both species and determined if the presence of one species influenced the detection of the other species. Model selection results and associated parameter estimates provided no evidence that barred owls excluded spotted owls from territories. We found strong evidence that detection probabilities differed for the two species, with higher probabilities for northern spotted owls that are the object of current surveys. Non-detection of barred owls is very common in surveys for northern spotted owls, and detection of both owl species was negatively influenced by the presence of the congeneric species. Our results suggest that analyses directed at hypotheses of barred owl effects on demographic or occupancy vital rates of northern spotted owls need to deal adequately with imperfect and variable detection probabilities for both species.

  5. Importância clínica do músculo esternal e suas variações anatômicas: uma revisão sistemática da literatura

    Directory of Open Access Journals (Sweden)

    Luana Agapito de Oliveira

    2017-08-01

    Full Text Available A presença do músculo esternal é uma variação anatômica que está situada anteriormente ao osso esterno e suas estruturas adjacentes e não tem função totalmente definida. Há na literatura mais relatos de estudos anatômicos sobre o músculo esternal do que sobre as implicações clínicas da sua presença. O objetivo deste estudo foi analisar as descrições existentes das variações anatômicas do músculo esternal, compreendendo, assim, a importância clínica desse conhecimento. Foram avaliados artigos nas línguas portuguesa e inglesa, indexados nas bases de dados PubMed e SciELO, publicados entre 1867 e 2016. Buscou-se verificar os tipos de variações anatômicas do músculo esternal descritas, suas origens e inserções, inervação e irrigação sanguínea. Em seguida, foi relatada a importância clínica do conhecimento dessa variação. O músculo esternal apresenta diversas dimensões e inserções, o que dificulta a determinação de sua função. Devido à localização paraesternal, em exames de imagem o referido músculo pode ser visto como uma nodulação anormal na região da mama e ser confundido com um tumor. O reconhecimento dessa variação antes de procedimentos cirúrgicos na parede torácica evita possíveis complicações e possibilita o uso do tecido como retalho muscular em cirurgias reconstrutivas da mama; também pode ser usado na melhora de resultados estéticos em mamoplastia de aumento ou fornecer cobertura extra para próteses. O conhecimento sobre essa variação anatômica é bastante relevante, pois a percepção da existência do músculo esternal e de suas variações relaciona-se a importantes implicações clínicas em cirurgias de mama e tórax.

  6. Variação da pressão intraocular no exercício resistido realizado em duas diferentes posições

    Directory of Open Access Journals (Sweden)

    Alex Sander Soares

    2015-06-01

    Full Text Available Objetivo Verificar a variação da PIO no exercício resistido na posição sentada e em decúbito dorsal. Métodos Foram avaliados 14 voluntários do Centro de Atividades Físicas do Banco de Olhos de Sorocaba (BOS Fit. Os critérios de exclusão adotados foram: I opacidade de meios; II alteração de volume do bulbo ocular ou ausência de bulbo ocular; III PIO maior do que 21mmHg; IV idade inferior 20 e superior a 40 anos; V tempo de prática de treinamento resistido inferior a 30 dias. Inicialmente foi realizado o teste de predição no exercício leg press para determinar o percentual de carga para o respectivo exercício durante o experimento. Os voluntários foram submetidos a duas intervenções separadas em um intervalo de 72 horas, ambas com o mesmo volume e intensidade no exercício leg press, ou seja, 3 séries de 15 repetições com 60% 1RM, tempo de intervalo entre as séries de 60 segundos e velocidade moderada, de acordo com as seguintes posições: P1 leg-press executado na posição sentada e P2 leg press na posição em decúbito dorsal. A PIO foi obtida utilizando o tonômetro de Perkins em três momentos: M1 imediatamente antes do exercício; M2 imediatamente após a terceira série; M3 três minutos após a finalização da terceira série. Resultados Em ambas as posições houve queda significativa da PIO após o exercício (M2, permanecendo significativamente reduzida após três minutos de recuperação (M3. Contudo, não houve diferença da PIO segundo a posição (P1 e P2, independentemente do momento de aferição (M1, M2 e M3. Conclusão Houve queda da PIO decorrente ao exercício resistido e não foi verificada resposta diferencial da PIO de acordo com a posição do exercício.

  7. Análise da variação do desempenho de empresas brasileiras Analysis of variation in the performance of Brazilian companies

    Directory of Open Access Journals (Sweden)

    Carol Thiago Costa

    2011-09-01

    Full Text Available Este trabalho analisa a influência dos ciclos econômicos no desempenho das firmas. Dados sobre uma amostra representativa de firmas de capital aberto, atuantes em 18 setores da economia, foram coletados por um período de vinte e três anos (1986-2008. Os resultados encontrados corroboram os estudos anteriores ao atribuírem maior importância aos fatores associados às características da firma, mesmo considerando um período de análise com maior número de anos e, por conseguinte, com a contribuição de um elevado numero de variáveis macroeconômicas, tais como crises e diferentes planos econômicos. Porém, foi possível confirmar que intervalos de tempo maiores de análise tendem a reduzir o efeito da firma, e que as contribuições do efeito ano em particular apesar de corroborarem os resultados obtidos nos estudos anteriores, em termos absolutos, relativamente apresentam uma grande variação. O mesmo fenômeno é observado quando se verifica a interação entre ano e ramo de negócios, implicando que diferentes ramos são afetados de maneira desigual pelas variáveis macroeconômicas em períodos de tempo mais longos.

    This paper analyzes the influence of economic cycles on the performance of firms. Data on a representative sample of open capital traded firms, operating in eighteen sectors of the economy, were collected for a period of twenty-three years (1986-2008. The results corroborate previous studies to give greater importance to factors associated with characteristics of the firm, even though a period of analysis with more years and, therefore, the contribution of a large number of macroeconomic variables, such as crises and different economic plans. However, it was possible to confirm that longer intervals of analysis tend to reduce the effect of the firm, and that the contributions of the effect in particular years, although

  8. Variação de temperatura do músculo quadríceps femoral exposto a duas modalidades de crioterapia por meio de termografia

    Directory of Open Access Journals (Sweden)

    Alberito Rodrigo de Carvalho

    2012-04-01

    Full Text Available INTRODUÇÃO: Crioterapia é qualquer forma de aplicação terapêutica de frio que leva à diminuição da temperatura dos tecidos. OBJETIVO: Comparar as variações na temperatura superficial do músculo quadríceps femoral, em três momentos distintos, quando expostos a duas modalidades de crioterapia: sacos com gelo ou sacos contendo mistura de gelo e água. MATERIAIS E MÉTODOS: Participaram do estudo 18 indivíduos, com idade entre 18 e 25 anos, de ambos os sexos. Em cada voluntário foi realizada, simultaneamente, crioterapia com gelo na coxa esquerda e mistura de gelo e água na coxa direita, durante 15 minutos na região do quadríceps femoral. A temperatura superficial foi mensurada por um termógrafo e foram feitos registros nos seguintes momentos: pré-crioterapia, imediatamente e 15 e 30 minutos após a retirada da modalidade de crioterapia. RESULTADOS: Ambas as modalidades de crioterapia foram eficientes para diminuir a temperatura do quadríceps femoral e a mistura de gelo e água foi capaz de induzir a uma temperatura mais baixa em relação àquela modalidade que usou somente gelo. O resfriamento, para ambas as modalidades, perdurou por, pelo menos, 15 minutos após a retirada do gelo e a temperatura superficial já estava restaurada ao nível pré-aplicação aos 30 minutos após a retirada. CONCLUSÃO: Ambas as modalidades promoveram redução da temperatura que perdurou, pelo menos, durante 15 minutos; e após 30 minutos da retirada das modalidades a temperatura foi restabelecida aos níveis normais. Contudo, a mistura de gelo e água produziu resfriamento maior do que a modalidade de gelo sozinho.

  9. Monitoring presence of chemical agents

    International Nuclear Information System (INIS)

    Preston, J.M.

    1984-01-01

    The specification describes a case for use with a hand-portable chemical agent detector for continuously monitoring an atmosphere for the presence of predetermined chemical agents. The detector having means for ionizing air samples and providing at an output terminal electrical signals representative of the mobility spectrum of ionized chemical vapours produced by the ionizing means. The case comprises means for defining a chamber in the case for supporting and removably enclosing the detector, means for communicating ambient atmosphere to the chamber, electrical circuit means in the case, the circuit means being adapted to be detachably connected to the detector output terminal when the detector is positioned in the chamber and being responsive to the electrical signals for producing an alarm signal when the signals detect a chemical agent concentration in the atmosphere exceeding a predetermined concentration level, and alarm means responsive to the alarm signal. (author)

  10. Estudo da variação da concentração de metano no biogás produzido a partir das águas residuárias do café A study on the variation of methane concentration in biogas produced from coffee wastewater

    Directory of Open Access Journals (Sweden)

    Marco Antônio Calil Prado

    2010-04-01

    Full Text Available A água residuária do café (ARC, originada no processamento dos frutos do cafeeiro, produz quantidade considerável de biogás que pode e deve ser utilizado como fonte de energia alternativa e complementar. Neste trabalho, foi estudada a variação da concentração de metano do biogás produzido a partir das ARC, por tratamento anaeróbio, em reator UASB, em escala laboratorial. As amostras foram coletadas durante 86 dias. As análises da concentração de metano foram realizadas por cromatografia gás-sólido (CGS. A produção de biogás e de metano, foi de 0,545 a 0,602 m³ kg-1DQO removida e de 0,382 a 0,421 m³ kg-1 DQO removida, respectivamente. Os resultados da concentração de metano no biogás variaram de 48,60 a 68,14 %, influenciados pela variação dos parâmetros temperatura, pH, acidez e compostos fenólicos presentes nas ARC. Como havia sido previsto, as maiores concentrações de metano foram verificadas nos períodos em que o pH estava mais próximo da neutralidade.The wastewater produced from wet coffee processing (WCP, originated from the coffee fruits, can produce great quantities of biogas, which, in turn, can be also used as an alternative or complementary energy source. In this research, we studied the variation of methane concentration produced by WCP in a laboratory-scale UASB reactor with anaerobic treatment. The samples were collected during a period of 86 days. The methane concentration was measured through gas solid chromatography (GSC. The production of biogas and methane ranged from 0.545 to 0.602 m³ kg-1DQO removed and from 0.382 a 0.421 m³ kg-1 DQO removed, respectively. Methane presence in the biogas ranged from 48.60% to 68.14 %. This variation was influenced by the following parameters: temperature, pH, acidity, and phenol compounds present in the WCP. As expected, greater concentrations of methane gas were verified during the periods when the pH close to neutral.

  11. Estrutura do pasto de capim-braquiária com variação de alturas Structure of signal grass pasture with height variation

    Directory of Open Access Journals (Sweden)

    Manoel Eduardo Rozalino Santos

    2010-10-01

    Full Text Available Este trabalho foi conduzido com o objetivo de avaliar as características estruturais da Brachiaria decumbens cv. Basilisk. Foram avaliadas quatro alturas de plantas (10, 20, 30 e 40 cm dentro de uma mesma pastagem, em um delineamento experimental de blocos casualizados com duas repetições. A variação na altura inicial das plantas no pasto de capim-braquiária apresentou resposta linear e negativa. As massas de lâmina foliar verde, colmo verde, material morto, forragem verde e forragem total aumentaram linearmente com a altura das plantas no pasto. Contrariamente, houve redução linear na relação lâminas foliares verdes/colmos verdes com a altura das plantas no pasto (de 1,16 para 0,58. A altura das plantas no pasto teve efeito mais pronunciado sobre o aumento das massas de colmo verde e material morto que sobre a massa de lâmina foliar verde. A densidade volumétrica de lâminas foliares verdes decresceu (de 97,09 para 39,07 kg/cm.ha de MS com a altura das plantas no pasto. Mesma resposta ocorreu para as densidades volumétricas de forragem verde (de 181,62 para 107,85 kg/cm.ha de MS e forragem total (de 283,39 para 195,72 kg/cm.ha de MS. Por outro lado, não houve efeito da altura das plantas no pasto sobre as densidades volumétricas de colmos verdes e material morto, que apresentaram valores médios de 80,95 e 95,61 kg/cm.ha de MS, respectivamente. A altura das plantas no pasto teve efeito quadrático sobre a interceptação de luz pelo dossel. Áreas da pastagem com alturas de 10, 20, 30 e 40 cm apresentaram valores de interceptação luminosa de 56,15; 85,16; 93,39 e 96,57%, respectivamente. Ocorre variação espacial e temporal na estrutura do pasto de B. decumbens manejado sob lotação contínua.This study was carried out aiming to evaluate the structural characteristics of Brachiaria decumbens cv. Basilisk pasture. Four heights of plants (10, 20, 30 and 40 cm were evaluated within the same grazing area in a randomized block

  12. Variações espaço-temporais no estoque de sementes do solo na floresta amazônica Space-time variations in soil seed stock in an amazon rainforest

    Directory of Open Access Journals (Sweden)

    Niwton Leal Filho

    2013-09-01

    Full Text Available A dispersão eficiente, a longevidade e a capacidade das sementes de permanecer em estado latente a espera de condições adequadas de germinação no banco de sementes do solo da floresta garantem a presença de espécies arbóreas pioneiras nas áreas perturbadas. As variações estacionais e espaciais na densidade e na composição florística do banco de sementes em Florestas Tropicais Úmidas são assuntos ainda pouco compreendidos. Este trabalho verificou a existência de modificações espaço-temporais do banco de sementes presente em áreas de Floresta Tropical úmida localizadas próximas a Manaus, AM. Em cada uma das seis áreas estudadas, foram coletadas 40 amostras circulares de solo superficial (10 cm de diâmetro e 2 cm de profundidade ao acaso. Essas amostras foram coletadas a cada dois meses, entre agosto/2004 e junho/2005,. As amostras de solo foram distribuídas em bandejas em casa de vegetação e a emergência das sementes presentes no solo foi acompanhada por 4 meses. Houve uma redução significativa (H: 14,09, p The dispersion efficiency, longevity and the ability of seeds to remain latent waiting for suitable conditions for germination in the forest soil seed bank ensures the presence of pioneer tree species in disturbed areas. The seasonal and spatial variations in the density and floristic composition of the seed bank in tropical rainforests is a subject still little understood. This work verified the existence of spatio-temporal changes of the seed bank present in areas of humid tropical rain forest located near Manaus, Amazonas. In each of the six study areas, 40 circular samples of topsoil (10 cm in diameter and 2 cm deep were randomly collected every two months, from August 2004 to June/2005. Inside a greenhouse, the collected soil samples were distributed in trays and the emergence of seeds present in the soil was accompanied during four months. There was a significant reduction (H: 14.09112, p <0.05 in the mean

  13. Anomalias e variações na fórmula dentária em morcegos do gênero Artibeus Leach (Chiroptera, Phyllostomidae Anomalies and variation in the dental formula of bats of the genus Artibeus Leach (Chiroptera, Phyllostomidae

    Directory of Open Access Journals (Sweden)

    Ana Maria Rui

    2004-09-01

    Full Text Available Descreve-se a ocorrência e analisa-se as causas de anomalias dentárias em Artibeus lituratus (Olfers, 1818 e A. fimbriatus Gray, 1838 (Chiroptera: Phyllostomidae provenientes de populações do Estado do Rio Grande do Sul, sul do Brasil. São discutidas, com base no material examinado e em ampla revisão da literatura, as variações quanto à presença dos terceiros molares superior e inferior entre diferentes espécies de Artibeus Leach, 1821. Foram analisados 104 crânios de A. lituratus e 44 de A. fimbriatus quanto à fórmula dentária. Em A. lituratus ocorreram dois casos de dentes extranumerários, um incisivo superior e um terceiro molar superior direito, e um de agênese dentária dos terceiros molares inferiores. Em A. fimbriatus constatou-se a ocorrência de um segundo pré-molar superior direito extranumerário. As ocorrências do terceiro molar superior em A. lituratus e do segundo pré-molar superior em A. fimbriatus são casos de atavismos. Em Artibeus (Artibeus ocorrem variações quanto à presença do terceiro molar superior, de maior ou menor intensidade, em praticamente todas as espécies. Estas variações ocorrem tanto a nível intrapopulacional quanto geográfico. Já o terceiro molar inferior está ausente em baixa freqüência em várias populações de diferentes espécies. Os terceiros molares superiores e inferiores estão em processo de desaparecimento na linhagem dos Artibeus (Artibeus. O fato destes dentes já não ocorrerem em algumas espécies, terem ocorrência variável em outras e serem sempre estruturas reduzidas e simplificadas, sem função na mastigação, são indicativos deste processo evolutivo. A variação intensa observada quanto à ocorrência do terceiro molar superior inviabiliza o seu uso como caráter útil na identificação de espécies.This paper describes and analyzes the causes of dental formula anomalies in the bats Artibeus lituratus (Olfers, 1818 and Artibeus fimbriatus Gray, 1838

  14. Variação de caracteres em híbridos de abacaxizeiro obtidos de diferentes cruzamentos Characters variation in pineapple hybrids obtained by different crosses

    Directory of Open Access Journals (Sweden)

    José Renato Santos Cabral

    2009-12-01

    Full Text Available A herança dos caracteres utilizados na seleção de híbridos de abacaxi é de suma importância para o sucesso dos programas de melhoramento genético desta fruteira. o trabalho teve como objetivo analisar as variações observadas nos principais caracteres utilizados na seleção de híbridos de abacaxi obtidos de diferentes cruzamentos. Foi realizada a análise de variância dos caracteres: altura da planta do solo até à base do fruto, comprimento do pedúnculo, peso do fruto sem coroa, peso da coroa, teor de sólidos solúveis e acidez titulável de 446 genótipos avaliados e 213 selecionados. observou-se uma diminuição do peso do fruto nos híbridos selecionados na maioria dos cruzamentos e aumento dos sólidos solúveis em todos os cruzamentos, quando comparados com todos os genótipos avaliados. Constatou-se correlação linear simples positiva significativa entre o peso do fruto e a altura da planta. Foi observada também correlação linear simples significativa, de baixa magnitude, positiva entre o peso do fruto e o peso da coroa, a altura da planta e o peso da coroa, a altura da planta e o teor de sólidos solúveis e negativa entre o teor de sólidos solúveis e ocomprimento do pedúnculo. Verificou-se diferença entre os cruzamentos na seleção de genótipos de abacaxi para os caracteres estudados.The inheritance of traits used for the selection of pineapple hybrids is very important for the success of the genetic breeding program of this fruit crop. The objective of the present work was to analyze the variations observed in main traits used for the selection of pineapple hybrids obtained by different crosses. The analysis of variance for 446 evaluated and 213 selected genotypes was carried out for the following traits: plant height from soil to the base of the fruit, peduncle length, weight of the fruit without the crown, weight of the crown, total soluble solids content and titrable acidity. in general, it was observed that

  15. Análise da variação da produtividade dos serviços de água portugueses entre 1994 e 2001 usando a abordagem de malmquist

    Directory of Open Access Journals (Sweden)

    Rui Cunha Marques

    2006-04-01

    Full Text Available A produtividade de uma organização pode ser definida como a relação entre os produtos (outputs e os factores de produção consumidos (inputs. Este artigo discute e aplica uma técnica fronteira de natureza não paramétrica de cálculo da produtividade baseada no índice de produtividade de Malmquist (IPM. Pretende-se, através de um caso prático de aplicação ao sector da água em Portugal, evidenciar as potencialidades dos IPM, que assumem um relevo particular na regulação económica das indústrias de rede. O estudo da produtividade envolve 45 entidades gestoras, abrangendo cerca de 48 % da população portuguesa, e é efectuado para o período 1994-2001. Verifica-se que a evolução da produtividade foi negativa neste período, sobretudo devido à variação da tecnologia de produção e, em menor dimensão, à variação da eficiência de escala. Pelo contrário, a variação da eficiência técnica foi positiva e a variação da eficiência de sobreutilização apresentou um contributo insignificante.A decision-making unit productivity can be defined as the relationship between the products (outputs and the production factors consumed (inputs. This article discusses and applies a non-parametric frontier technique to measure productivity based on the Malmquist productivity index (MPI. By means of a case-study applied to the water sector in Portugal, we intend to stress the MPI strengths which are particularly relevant to the economic regulation of the network industries. The productivity study consists of 45 water services comprising around 48 % of the Portuguese population and it covers the period 1994-2001. We noticed that the productivity change was negative during this period, particularly due to the production technology change and to the scale efficiency change to a less extent. Conversely, the technical efficiency change was positive and the congestion efficiency change presented an insignificant value.

  16. Análise quantitativa no estudo da variação linguística: noções de estatística e análise comparativa entre Varbrul e SPSS

    Directory of Open Access Journals (Sweden)

    Alan Jardel de Oliveira

    2012-11-01

    Full Text Available Este artigo apresenta um estudo do modelo estatístico utilizado nosestudos variacionistas e uma análise das especificidades do softwareVarbrul em relação aos métodos convencionais de estimação deparâmetros. Além disso, apresenta os aspectos teóricos estatísticosmais relevantes que contribuem para a análise da variação linguísticae uma análise comparativa entre os resultados do Varbrul e do SPSS.

  17. Verificação do poder preditivo do spread entre as taxas de juros de longo e curto prazos na variação das taxas de curto prazo no Brasil

    OpenAIRE

    Silva, Arlete da

    2006-01-01

    A Hipótese das Expectativas (HE) é testada na Estrutura a Termo das Taxas de Juros brasileira (ETTJ) no sentido de se verificar se a inclinação da curva de juros, representada pelo spread entre as taxas de juros de longo e curto prazos, pode explicar as variações das taxas de juros de curto prazo no Brasil. Foram utilizadas séries com médias mensais das taxas de juros de um, três e seis meses, de janeiro de 1995 a janeiro de 2006, empregando metodologia baseada em regressões individuais. Os r...

  18. As variações na comunidade de Odonata (Insecta) em córregos podem ser explicadas pelo Paradoxo do Plâncton? Explicando a riqueza de espécies pela variabilidade ambiental

    OpenAIRE

    Oliveira Junior, José Max Barbosa; Universidade do Estado de Mato Grosso; Cabette, Helena Soares Ramos; Universidade do Estado de Mato Grosso; Pinto, Nelson Silva; Universidade Federal de Goiás; Juen, Leandro; Universidade Federal do Pará

    2013-01-01

    A teoria do Paradoxo do Plâncton postula que ambientes que apresentam flutuações temporais periódicas apresentariam alta diversidade de espécie, uma vez que essas flutuações impediriam a ocorrência da exclusão competitiva. Este trabalho teve como objetivo avaliar a variação da comunidade de Odonata adulto na Bacia do Rio Suiá-Miçú, testando a hipótese de que locais que apresentam variá...

  19. Variação das dimensões características e da forma dos frutos de café durante o processo de secagem Variation of characteristic dimensions and forms of coffee fruits during drying process

    Directory of Open Access Journals (Sweden)

    Paulo C. Corrêa

    2002-12-01

    Full Text Available O presente trabalho teve como objetivo avaliar o efeito da variação do teor de umidade nas dimensões e propriedades físicas-esfericidade e circularidade do fruto do café das espécies arabica e canephora, de diferentes variedades. Os resultados obtidos permitiram afirmar que a redução do teor de umidade afeta de forma acentuada as características físicas do fruto do cafeeiro das espécies e variedades estudadas, indicando que são importantes as variações das dimensões do fruto ao longo do processo de secagem e, ainda, que as expressões matemáticas ajustadas aos dados obtidos representaram de forma satisfatória os fenômenos estudados.The present work had as objective to evaluate the effect of moisture content variation on dimensions and physical properties (sphericity and roundness of coffee fruit of the arabica and canephora species, for different varieties. The obtained results show that the reduction of moisture content affects in an accentuated way the physical characteristics of coffee fruit of the studied species and varieties, indicating that the variations of dimensions of the fruit along the drying process are important. Further, the mathematical expressions adjusted to the data were satisfactory for the studied phenomena.

  20. Análise da variação do tempo dedicado ás viagens urbanas da população de Manaus – AM, em função do modo de transporte utilizado

    Directory of Open Access Journals (Sweden)

    Aline Leite

    2012-06-01

    Full Text Available A ausência de planejamento, característica da maioria dos bairros de Manaus deixou como herança um sistema viário incompatível com o tamanho atual da cidade. Neste artigo busca-se analisar a variação do tempo dedicado às viagens urbanas em Manaus em função de três diferentes modos de transporte: ônibus, micro-ônibus e automóvel. Receptores do Sistema de Posicionamento Global (GPS e recursos de um Sistema de Informações Geográficas (SIG foram utilizados para levantar e tratar os dados das viagens urbanas realizadas. Considera-se (por tudo o que o trabalho permitiu concluir, que a metodologia adotada foi bastante consistente para o reconhecimento da variação de desempenho de modos de transporte investigados. Os percursos mais longos permitiram melhor desempenho que os mais curtos, notadamente influenciado pela área central da cidade, que registrou os trechos mais lentos para os três modos.

  1. Somaclonal variation in micropropagated Heliconia bihai cv. Lobster Claw I plantlets (Heliconiaceae Variação somaclonal em mudas micropropagadas de Helicônia, Heliconia Bihai cv. Lobster Claw I (Heliconiaceae

    Directory of Open Access Journals (Sweden)

    Paulo Hercílio Viegas Rodrigues

    2008-12-01

    Full Text Available The occurrence of somaclonal variation is described in various cultures of agronomic interest. Such variation can be of benefit in the development of new flower varieties. In this study, the occurrence of somaclonal variation in micropropagated changes of Heliconia bihai cv. Lobster Claw I was investigated. Stem apexes were introduced in MS culture media with the addition of 2.5 mg L-1 of benzylaminopure (BAP and 500 mg L-1 of sodium cefotaxime. After selecting the apex stem, it was sub-cultivated in MS media and supplemented with 4.0 mg L-1 of BAP to induce side buds. To conduct the trial, 2,000 plants were selected and compared with plants originated from rhizomes. To calculate the percentage of the variants, the plant stature, the form and color of leaves and pseudostem were evaluated. The plants with buds presenting the same type of variation were considered as variants. The occurrence of three types of somaclonal variants was observed: Variation of the Chlorophyll in the Leaf, Low Stature Variant and Pseudostem and Petiole Color Variant, the latter with ornamental potential. The somaclonal variation rate for Heliconia bihai cv Lobster Claw I, under the proposed conditions, was 61.40%.A ocorrência de variação somaclonal é descrita em diversas culturas de interesse agronômico. A floricultura pode beneficiar-se dessa variabilidade, com a obtenção de novas variedades. Nesse trabalho, estudou-se a ocorrência de variação somaclonal em mudas micropropagadas de Heliconia bihai cv. Lobster Claw I. Ápices caulinares foram introduzidos em meio de cultivo MS com adição de 2,5 mg L-1 de benzilaminopurina (BAP e 500 mg L-1 de cefotaxima sódica. Após a seleção do ápice caulinar, o explante foi subcultivado em meio MS suplementado com 4,0 mg L-1 de BAP para indução de brotações. Foram selecionadas, ao acaso, 2.000 mudas e comparadas com mudas originadas de rizomas, para compor o ensaio. No cálculo da porcentagem dos variantes

  2. Limnological variations of a deep reservoir in periods with distinct rainfall patterns Variações na limnologia de um reservatório profundo em períodos com diferentes padrões de precipitação

    Directory of Open Access Journals (Sweden)

    Ana Maria Geraldes

    2012-12-01

    Full Text Available AIM: This study intends to provide information on how precipitation variation may impact environmental parameters (total phosphorus, water temperature, pH, conductivity, dissolved oxygen, Secchi depth, chlorophyll a and Anabaena abundance and crustacean zooplankton composition and abundance. METHODS: Samples were collected monthly from October 2000 to September 2002 and from October 2007 to September 2009 at one single sampling station located at the deepest point of the reservoir. All data were obtained in the euphotic zone. RESULTS: The highest values of total phosphorous concentrations were reported together with the maximal values of precipitation. Conversely, conductivity decreased during the wet periods. Anabaena presence was only detected between September and December 2001. Daphnia longispina total abundance showed large inter-annual differences. A clear seasonal pattern was inferred for Diaphanosoma brachyurum and Ceriodaphnia pulchella. Both species are thermophilic and begin to be detected in early summer when the water temperature is around 15 ºC. Copidodiaptomus numidicus abundance did not present a clear seasonal pattern. CONCLUSIONS: Some of the observed shifts in environmental parameters (Conductivity, total phosphorus concentrations and Anabaena abundance resulting in changes in zooplankton abundance are induced by rainfall variation. The most affected species were those with a lack of seasonality (C. numidicus or species occurring mainly in winter/early summer (Daphnia longispina. However, a wide range of physical, chemical and biotic interactions is likely to influence zooplankton abundance. Therefore, caution is advised when relating the observed variation exclusively with rainfall intensity. In fact, some of the observed shifts were induced by other factors varying subtly in a seasonal or inter-annual pattern, independently of rainfall intensity.OBJECTIVO: Com o presente estudo pretende-se obter informação sobre os

  3. Variações na composição e estrutura da vegetação permitem detectar agrupamentos florísticos em uma Floresta Subtropical Atlântica no Sul do Brasil?

    Directory of Open Access Journals (Sweden)

    João Paulo de Maçaneiro

    2016-12-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2016v29n4p43 As variações da vegetação em função da posição topográfica têm despertado o interesse dos pesquisadores. Entretanto, poucos estudos verificaram as associações florísticas formadas pela posição topográfica de uma encosta. Neste trabalho, analisamos se as variações na vegetação permitem detectar agrupamentos florísticos em uma Floresta Pluvial Subtropical. A vegetação foi amostrada em 25 parcelas de 400 m² distribuídas sistematicamente, onde foram medidos os indivíduos com DAP ≥ 5,0 cm. Amostramos 1.727 indivíduos e 144 espécies. A ordenação NMDS segregou três grupos em função da posição topográfica da encosta (Monte Carlo, P ≥ 0,05; ANOSIM, P < 0,001. Euterpe edulis e Sloanea guianensis se destacaram nos terços inferior e médio da encosta, enquanto Ocotea aciphylla e Alchornea triplinervia se destacaram no terço superior. Algumas espécies se mostraram indicadoras dos setores analisados, como é o caso de Actinostemon concolor e Alsophila setosa no terço inferior, Cyathea corcovadensis e Rudgea recurva no terço médio e Myrcia pulchra e Podocarpus sellowii no terço superior. Nossos resultados indicaram que as variações florísticas e estruturais observadas por Veloso e Klein (1959 e Klein (1980; 1984 para o Vale do Itajaí em Santa Catarina apresentam validade estatística nos dias atuais, pois verificamos a formação de diferentes grupos de acordo com a posição topográfica da encosta.

  4. Wood owls of the genera Strix and Ciccaba

    NARCIS (Netherlands)

    Voous, K.H.

    1964-01-01

    "... speaking here as a taxonomist to taxonomists, I am certainly no less than respectful toward the noble art of classification" (Léon Croizat, 1958, p. 119). In considering a thorough systematic study a necessity before entering into zoogeographical theories, the author feels he may expect the

  5. Presence in Virtual Reality Exposure Therapy Systems

    OpenAIRE

    Ling, Y.

    2014-01-01

    Experiencing anxiety is essential for virtual reality exposure therapy (VRET) to be effective in curing patients suffering from anxiety disorders. However, some patients drop out in VRET due to the lack of feeling anxiety. Presence - which refers to the feeling of being in the virtual environment - has been considered an important mechanism that leads to the experience of anxiety. Therefore, understanding the relationship between presence and anxiety and finding ways to improve presence in VR...

  6. Computação algébrica no cálculo das variações: determinação de simetrias e leis de conservação

    OpenAIRE

    Gouveia, Paulo D.F.; Torres, Delfim F.M.

    2005-01-01

    Os problemas de optimização dinâmica (em espaços de funções) tratados pelo calculo das variações, são normalmente resolvidos por recurso às condições necessárias de Euler-Lagrange, que são equações diferenciais de segunda ordem (ou de ordem superior, quando os problemas variacionais envolvem derivadas de ordem superior a um). Estas equações são, em geral, não lineares e de difícil resolução. Uma forma de as simplificar consiste em obter leis de conservação: primeiros integrais ...

  7. Autocontrole: um estudo sobre o efeito da variação simultânea da magnitude e do atraso do reforço e da possibilidade de realização de atividades distrativas

    OpenAIRE

    Menezes, Mariana São Thiago Bezerra de

    2007-01-01

    O presente estudo foi realizado com o objetivo analisar o autocontrole de crianças a partir da variação simultânea da magnitude e do atraso do reforço, com e sem a possibilidade de realização de atividades distrativas durante o período de atraso do reforço. Os participantes, 11 crianças com idade de 5 a 11 anos, com e sem o diagnóstico de TDAH, foram submetidas a esquema concorrente-encadeado num computador. A conseqüência produzida pela resposta no primeiro elo, dava início ao segundo elo e ...

  8. Análise Empírica dos Impactos dos Accruals na Variação do Capital Circulante Líquido: um estudo no setor de siderurgia e metalurgia

    Directory of Open Access Journals (Sweden)

    Romualdo Douglas Colauto

    2009-10-01

    Full Text Available O artigo demonstra os impactos dos accruals na variação do capital circulante líquido em companhias abertas do setor de siderurgia e metalurgia. Para constatação de evidências empíricas, utilizou-se como população-alvo as Sociedades Anônimas Abertas apresentadas entre as 500 Maiores e Melhores Empresas, segundo critério da Revista Exame na edição de 2003. A amostra extraída da população foi do tipo intencional não probabilística, com 7 empresas representativas do setor de Siderurgia e Metalurgia. O estudo é delineado como descritivo utilizando-se as técnicas de cluster e intervalo interpercentil para categorizar os dados necessários para as inferências. Os resultados ajudam a melhorar qualidade da informação contábil ao mostrar que os accruals provocam alterações no resultado do período, mas não infl uenciam, simultaneamente, o fluxo financeiro das atividades operacionais das empresas. Coefi cientes de correlações entre o resultado contábil do período ajustado pelos accruals e a variação do capital circulante líquido não apresentaram homogeneidade nos setores observados, mas denotaram significância estatística.

  9. Variações anuais na produção de frutos e sementes de Castanheira-do-Brasil (Bertholletia excelsa Bonpl., Lecythidaceae em florestas nativas de Roraima

    Directory of Open Access Journals (Sweden)

    Helio Tonini

    2014-02-01

    Full Text Available Este trabalho foi desenvolvido com o objetivo de estudar as variações anuais na produção de frutos e sementes entre populações e indivíduos em castanhais nativos de Roraima. Os dados foram obtidos em cinco parcelas permanentes de 300 m x 300 m instaladas nos Municípios de Caracaraí e São João da Baliza. Nas parcelas permanentes, todas as castanheiras com diâmetro à altura do peito (DAP superior ou igual a 10 cm foram identificadas, medidas e numeradas através de placas de alumínio presas aos fustes por pregos. Durante o período de queda dos frutos (março a julho, as árvores foram visitadas em duas ocasiões no meio e no final desse período, e os frutos contados, abertos e pesados com balança de gancho digital com precisão de 50 g. A produção de frutos e sementes varia entre populações e indivíduos e a maioria não produz frutos todos os anos. No ano de maior produção, um castanhal chega a produzir 52 vezes mais do que em anos de baixa. Nos locais estudados, a produção total concentra-se em um pequeno número de indivíduos com um ano de pico de produção (mast-year.

  10. Community of inquiry: Social presence revisited

    NARCIS (Netherlands)

    Kreijns, Karel; Van Acker, Frederik; Vermeulen, Marjan; Van Buuren, Hans

    2018-01-01

    Social presence is a construct that has attracted the attention of many educational scholars involved in online collaborative learning settings wherein all the dialogue is happening through text-based asynchronous and synchronous communication channels. The social presence of the learning group

  11. creating social presence in large classes

    African Journals Online (AJOL)

    Social presence refers to the ability of students to project themselves as 'real people' in an online learning community. While it is difficult to create social presence in large classes, educational technologies can enhance the social dimension of online learning if educators relinquish the use of technology as an instrument of ...

  12. Factors influencing presence in virtual worlds.

    Science.gov (United States)

    Chow, Meyrick C M

    2012-01-01

    Virtual worlds are showing potential as an effective platform for a variety of activities, including learning. The concept of presence (the sensation of "being there" in a mediated environment) has received substantial attention from the virtual reality community, and the effectiveness of virtual worlds has often been linked to the feelings of presence reported by their users. The present study examined the effects of attitude and perceived ease of use on sense of presence in Second Life, which is one of the most known and used virtual worlds. Based on data from a survey of 206 nursing students, hypotheses are empirically tested. Findings suggest that users' attitude toward using Second Life and their perceived ease of use of it have a positive effect on their sense of presence in the virtual environment. This study advances our understanding of factors influencing presence in virtual worlds.

  13. A variação de preposições com verbo ir de movimento em comunidades rurais do semiárido baiano A variação de preposições com verbo ir de movimento em comunidades rurais do semiárido baiano

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    Hilmara Moura de JESUS

    2012-06-01

    ística Variacionista, o presente estudo é direcionado para descrever o fenômeno da variação que envolve as preposições a, para e em introduzidas pelo verbo ir de movimento e analisar os fatores condicionantes (linguísticos e sociolinguísticos do uso dessas preposições. Os resultados apontam indícios de uma mudança praticamente concluída, visto ter-se encontrado apenas seis ocorrências com a preposição a. Dentre as 582 ocorrências que constituem os corpora, destacam-se 418 realizações com a variante para (71% e 164 com a variante em (29%. O programa estatístico Goldvarb 2001 selecionou as variáveis grau de definitude do nome locativo, permanência no local, pessoa do discurso, comunidade, tempo verbal, sexo/gênero, escolaridade, (indeterminação do sujeito e narratividade do discurso como as determinantes na regência variável do verbo ir de movimento.

  14. Presence and the utility of audio spatialization

    DEFF Research Database (Denmark)

    Bormann, Karsten

    2005-01-01

    The primary concern of this paper is whether the utility of audio spatialization, as opposed to the fidelity of audio spatialization, impacts presence. An experiment is reported that investigates the presence-performance relationship by decoupling spatial audio fidelity (realism) from task...... performance by varying the spatial fidelity of the audio independently of its relevance to performance on the search task that subjects were to perform. This was achieved by having conditions in which subjects searched for a music-playing radio (an active sound source) and having conditions in which...... supplied only nonattenuated audio was detrimental to performance. Even so, this group of subjects consistently had the largest increase in presence scores over the baseline experiment. Further, the Witmer and Singer (1998) presence questionnaire was more sensitive to whether the audio source was active...

  15. Presence within a mixed reality environment.

    Science.gov (United States)

    van Schaik, Paul; Turnbull, Triece; van Wersch, Anna; Drummond, Sarah

    2004-10-01

    Mixed reality environments represent a new approach to creating technology-mediated experiences. However, there is a lack of empirical research investigating users' actual experience. The aim of the current exploratory, non-experimental study was to establish levels of and identify factors associated with presence, within the framework of Schubert et al.'s model of presence. Using questionnaire and interview methods, the experience of the final performance of the Desert Rain mixed reality environment was investigated. Levels of general and spatial presence were relatively high, but levels of involvement and realness were not. Overall, intrinsic motivation, confidence and intention to re-visit Desert Rain were high. However, age was negatively associated with both spatial presence and confidence to play. Furthermore, various problems in navigating the environment were identified. Results are discussed in terms of Schubert's model and other theoretical perspectives. Implications for system design are presented.

  16. Sickness presence, sick leave and adjustment latitude

    Directory of Open Access Journals (Sweden)

    Joachim Gerich

    2014-10-01

    Full Text Available Objectives: Previous research on the association between adjustment latitude (defined as the opportunity to adjust work efforts in case of illness and sickness absence and sickness presence has produced inconsistent results. In particular, low adjustment latitude has been identified as both a risk factor and a deterrent of sick leave. The present study uses an alternative analytical strategy with the aim of joining these results together. Material and Methods: Using a cross-sectional design, a random sample of employees covered by the Upper Austrian Sickness Fund (N = 930 was analyzed. Logistic and ordinary least square (OLS regression models were used to examine the association between adjustment latitude and days of sickness absence, sickness presence, and an estimator for the individual sickness absence and sickness presence propensity. Results: A high level of adjustment latitude was found to be associated with a reduced number of days of sickness absence and sickness presence, but an elevated propensity for sickness absence. Conclusions: Employees with high adjustment latitude experience fewer days of health complaints associated with lower rates of sick leave and sickness presence compared to those with low adjustment latitude. In case of illness, however, high adjustment latitude is associated with a higher pro­bability of taking sick leave rather than sickness presence.

  17. Influência da variação da liquidez na precificação de ativos: análise em painel do mercado brasileiro no período de janeiro de 2000 a junho de 2008

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    Kelmara Mendes Vieira

    2011-01-01

    Full Text Available A influência da liquidez para o retorno dos ativos vem sendo amplamente pesquisada nos últimos anos, tanto do ponto de vista dos ativos individuais quanto do ponto de vista da liquidez de mercado. Este trabalho tem por objetivo principal avaliar a influência da variação da liquidez na precificação das ações. Como medidas de liquidez foram utilizadas as variações na quantidade de títulos, na quantidade de negócios e no volume financeiro, bem como estas variáveis ponderadas pelo índice Bovespa e também estas variáveis defasadas. A amostra é composta pelas ações negociadas na Bolsa de Valores de São Paulo. Foram coletados dados mensais para o período de janeiro de 2000 a junho de 2008. Os resultados mostraram que o retorno dos ativos é influenciado positivamente pelo retorno do índice Bovespa e pelas variações de liquidez. Geralmente, são as empresas com menores níveis de liquidez que apresentam as maiores variações positivas da própria liquidez e, consequentemente, terão retornos mais elevados.

  18. Perfil de deformação de embalagens em função da variação da pressão efetiva Package deformation profile as a function of the variation in effective pressure

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    Maria Isabel Berto

    2011-12-01

    Full Text Available As embalagens metálicas são amplamente utilizadas em processos de esterilização convencional de alimentos, realizados em autoclaves. Devido ao seu material de construção e principalmente ao design do corpo e tampa contendo ondulações, estas embalagens sofrem variação em seu volume interno durante o processamento térmico. A alteração deste volume interno é função da pressão efetiva, que é a diferença entre a pressão interna e externa da embalagem. O conhecimento do comportamento desta variação de volume, denominado de perfil da deformação da embalagem, é importante para a determinação do adequado espaço livre a ser deixado na etapa de enchimento, e para a verificação da necessidade e dimensionamento de uma contrapressão na autoclave durante o processamento térmico, que garanta a integridade da embalagem e eficiência de troca térmica do processo. Este trabalho constou da determinação do ponto de deformação permanente e do perfil de deformação de cinco tipos de embalagens cilíndricas metálicas comerciais, com volumes de 200, 307, 340, 908 e 2700 mL. Funções polinomiais ajustadas aos dados experimentais da variação do volume em função da pressão efetiva apresentaram altos coeficientes de correlação e valores de desvios padrões residuais abaixo de 10%, indicando que as mesmas podem predizer adequadamente este comportamento.Cans are widely used to sterilize food products in retorts using conventional processing techniques. Their construction material and the design of the rippled body lead to changes in the internal volume during thermal processing. This change in internal volume is due to the effective pressure, which is the difference between the pressures inside and outside the package. Knowledge of this variation in volume with respect to the pressure is important for the correct calculations of the package filling, head space, and to determine an appropriate over pressure to guarantee integrity

  19. Variação do potencial total da água em uma toposseqüência de solos de tabuleiro, durante dois anos Total water potential variation in a soil table land topsequence, during two years

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    Luciano da Silva Souza

    2001-02-01

    Full Text Available O trabalho teve como objetivo avaliar quinzenalmente, em 1996 e 1997, a variação do potencial total da água ao longo do tempo, em solos de uma toposseqüência de tabuleiro localizada em Sapeaçu, BA. Esta toposseqüência tinha as seguintes características: a comprimento de 190 m; b declividade média de 0,097 m m-1; c cultivo com laranja; d Latossolo Amarelo argissólico coeso, no terço superior; e Argissolo Amarelo coeso, no terço médio; f Argissolo Acinzentado não coeso, no terço inferior. A umidade do solo foi medida com sonda de nêutrons, nas profundidades de 0,30, 0,70, 1,10 e 1,50 m. Com base nas respectivas curvas de retenção, obteve-se o potencial matricial e, em seguida, o potencial total da água, para cada solo, profundidade e tempo. A camada coesa dificulta o fluxo de água no solo, tanto no processo de molhamento como no de secamento. Em conseqüência, o potencial total da água em solos com camada coesa varia bruscamente na camada mais superficial, ao longo do tempo, e mais lentamente nas camadas mais profundas. Em solo não coeso, a variação brusca do potencial ocorre apenas na camada mais superficial. O limite de tensão de água no solo de -1.500 kPa como sendo o ponto de murchamento permanente não se aplica à cultura dos citros.The objective of this work was to evaluate, fortnightly, during 1996/1997, the total soil water potential variation in a tableland topsequence in Sapeaçu county, BA, Brazil. This topsequence had the following characteristics: a length of 190 m; b slope of 0.097 m m-1; c orange as growing crop; d the upper third with a cohesive argisolic Yellow Latosol; e the middle third with a cohesive Yellow Argisol; and f the lower third with a non-cohesive Gray Argisol. Soil water was estimated by neutron probe at depths of0.30, 0.70, 1.10, and 1.50 m. Based on water retention curves, matric potential and, in sequence, total soil water potential were determined, for each soil and depth in

  20. Updating the ranking of the coefficients of variation from maize experiments=Atualização da proposta de classificação dos coeficientes de variação para a cultura do milho

    Directory of Open Access Journals (Sweden)

    Luciano Moreira Rezende

    2012-01-01

    Full Text Available The objective of this study was to update the ranking of the coefficients of variation (CVs from maize experiments and evaluate the accuracy of the data from the latest Brazilian publications. We rank-ordered the CVs for grain yield, plant and ear heights, number of ears per plant, and weight of commercial ears, except for the weight of 100 grains. The data were obtained from 143 scientific papers published from 2005 to 2010. The classification was based on the average (m and standard deviation (SD and the CVs were ranked as low, intermediate, high and very high. All of the random variables had the CVs normally distributed. For most of the traits, we observed a large difference between the ranks from Scapim and Pimentel Gomes. In summary, the coefficients of variation have to be classified for each variable, significant improvement occurred in the accuracy of the national maize experiments in the last 15 years, and they still require periodic updating.O objetivo desse trabalho foi fazer a atualização na proposta de classificação dos coeficientes de variação (CV para a cultura do milho e avaliar a qualidade dos dados dos artigos mais recentes publicados no Brasil. Os CV das diferentes variáveis aleatórias foram obtidos a partir da consulta de 143 artigos científicos publicados de 2005 e 2010. As faixas de classificação dos (CV foram baseadas na média (m e no desvio-padrão (DP da seguinte forma: baixo; médio; alto; muito alto. Todos os cv das variáveis aleatórias apresentaram distribuição normal. Foi possível observar que para a maioria dos caracteres avaliados houve uma grande diferença entre a classificação proposta e a de Pimentel-Gomes. Houve melhoria significativa na qualidade experimental na cultura do milho para os principais caracteres produtividade de grãos, alturas de planta e espiga, número de espigas por planta e peso de espigas comerciais, sendo a única exceção o peso de 100 grãos. Conclui-se que as faixas

  1. Determinação da variação da viscosidade intrínseca do poli (tereftalato de etileno de embalagens Determination of intrinsic viscosity variation for polyethyelene terephthalate's bottles

    Directory of Open Access Journals (Sweden)

    Sandro D. Mancini

    2004-06-01

    Full Text Available O mercado de embalagens de poli(tereftalato de etileno -PET- para acondicionamento de refrigerantes, água mineral, sucos concentrados e óleos comestíveis apresenta polímeros de diferentes tipos, que foram desenvolvidos para personalizar o atendimento a clientes desejosos de propriedades melhores e mais específicas, principalmente em termos de massa molar. No caso do PET, assim como na indústria da reciclagem do polímero, o ensaio de viscosidade intrínseca é muito usado para determinar a massa molar. Este trabalho apresenta os resultados de viscosidade intrínseca de PET advindo de embalagens de várias marcas de refrigerantes, sucos e óleos de soja. Amostras de cada embalagem foram dissolvidas em solução de fenol-tetracloroetano (60:40 em peso e o fluxo das mesmas em um viscosímetro Cannon-Fenske a 30 °C para medir a viscosidade relativa, que foi convertido para viscosidade intrínseca. Os resultados mostraram uma variação no valor da propriedade conforme se variava o volume, tipo e a marca do produto envasado. Para as 21 amostras analisadas, os resultados variaram de 0,70 a 0,79 dL/g. Portanto, uma melhor seleção das embalagens pode ajudar os recicladores na obtenção de produtos melhores, com menor variação na massa molar. Os valores de densidade obtidos apresentaram uma pequena variação, que torna-se maior quando transformados em cristalinidade.The market of polyethylene terephthalate (PET bottles presents polymers of different types, which have been developed in order to provide the client with products with improved properties, mainly in respect of molar mass. In the case of PET, as well as in the recycling industry of this polymer, the test of intrinsic viscosity is widely used to determine molar mass. This study presents the results of intrinsic viscosity and density for PET bottles of soft-drinks, juices and soy-bean oils. Samples of each bottle were dissolved in 60-40 phenol-tetrachloroethane solution and flowed

  2. Novo método de classificação de coeficientes de variação para a cultura do arroz de terras altas A new method of variation coefficient classification for upland rice crop

    Directory of Open Access Journals (Sweden)

    Nilce Helena de Araújo Diniz Costa

    2002-03-01

    Full Text Available A avaliação de coeficientes de variação (CV como medida de precisão em experimentos tem sido realizada em diversas culturas, com alguns trabalhos propondo métodos para obtenção de faixas de classificação de CV, e outros trabalhos definindo as faixas de classificação, sempre com base na média e no desvio-padrão dos CVs, e pressupondo que os mesmos têm distribuição normal, o que nem sempre é verdadeiro. Este trabalho teve por objetivo propor um método para definir faixas de classificação de CV, independentemente da distribuição que possam apresentar; o método é baseado no uso da mediana (Md e do pseudo-sigma (PS. Utilizaramse, para este estudo, dados de 110 experimentos com arroz de terras altas, delineados em blocos completos casualizados, blocos incompletos generalizados, e reticulados quadrados, selecionandose os caracteres relacionados às doenças, ao acamamento, ao rendimento de grãos e a alguns componentes da produção. Foram construídas faixas de classificação de CV de cada caráter estudado, de forma geral e considerando o delineamento experimental empregado em experimentos com 30 a 100 tratamentos. O método proposto é eficiente para a definição de faixas dos CVs, independentemente de sua distribuição, e a variação nos valores do CV evidencia a importância de se considerar não só a variável em estudo, mas também o delineamento experimental utilizado. Experimentos que apresentaram menores CVs foram aqueles em que se empregaram os Delineamentos de Blocos Incompletos. As variáveis relacionadas às doenças e ao acamamento apresentam maiores coeficientes de variação.The assessment of coefficients of variation (CV as a measure of precision in experiments has been done for various crops, and some researchers have proposed a methodology to get classification bands of CV, and others defining the classification bands itself; based on the mean and on the standard deviation of the CV, assuming that they

  3. Variação do tamanho corporal de machos de Eulaema nigrita Lepeletier (Hymenoptera, Apidae, Euglossini. Resposta materna à flutuação de recursos?

    Directory of Open Access Journals (Sweden)

    Peruquetti Rui Carlos

    2003-01-01

    Full Text Available It was compared body size (measured as intertegular span variance of trapped-males of Eulaema nigrita Lepeletier, 1841 sampled in dry (July, August and September and wet (December, January and February seasons of the years 1988/89 and 1994/95 in Viçosa (Minas Gerais, Brazil. It was also compared the body size variance between males and females sampled in three nests found in São Carlos (São Paulo, Brazil and between these males and trapped ones. The smaller male (6.4 mm was sampled in June and the bigger (8.9 mm in July 1994, but the majority (32.3% showed an intertegular span ranging from 7.8 to 8.0mm. The observed variance in body size was similar between males sampled in nests and trapped-males and the variance found inside a nest was similar between the sexes. However, males sampled in 1988/89 were bigger than 1994/95 males and males sampled in nests were smaller than trapped-males. The variance of the body size of males did differ between 1988/89 and 1994/95. In the first period differences between males sampled in dry or wet season was not observed, but in 1994/95 period the males sampled in dry season showed significantly greater variance in body size than males sampled in wet season. The body size variance did not differ between the wet seasons of 1988/89 and 1994/95. The body size variation, measured as the coefficient of variation in intertegular span, did not differ between males of E. nigrita (CV = 4.3% and ground-nesting bees. These results show that the variation in body size of males of E. nigrita reflects that one found inside the nests of this bee, being similar among males and females. This variation is expected as result of ecological factors influences the nesting females. El Niño climatic events alone or in association with the lack of local food resources due to deforestation and presence of monocultures might play a role in observed body size variation. However this hypothesis is not sufficient to explain the observed

  4. Análise das variações florísticas e estruturais da comunidade arbórea de um fragmento de floresta semidecídua às margens do rio Capivari, Lavras-MG

    Directory of Open Access Journals (Sweden)

    Souza Josival Santos

    2003-01-01

    Full Text Available Realizou-se um estudo das variações florísticas e estruturais da comunidade arbórea em um fragmento de Floresta Estacional Semidecídua situado às margens do rio Capivari, em Lavras, Minas Gerais, com o objetivo de analisar as correlações entre variáveis ambientais (edáficas, topográficas e morfométricas do fragmento e a distribuição das espécies arbóreas. Procurou-se, também, ampliar o conhecimento sobre a composição florística e a estrutura fitossociológica das comunidades arbóreas da região do alto rio Grande. As espécies arbóreas foram amostradas em coletas extensivas na área e intensivas dentro de 28 parcelas de 20 20 m, tendo sido considerados apenas os indivíduos com DAP > 5 cm. As parcelas foram distribuídas em cinco transeções, dispostas paralelamente à inclinação predominante do terreno. As variáveis ambientais foram obtidas por meio do levantamento topográfico do fragmento e de análises químicas e granulométricas de amostras dos solos. As correlações entre distribuição das abundâncias das espécies e as variáveis ambientais nas parcelas foram avaliadas por análise de correspondência canônica (CCA. A listagem florística registrou 166 espécies, sendo 140 encontradas dentro das parcelas. A comunidade arbórea apresentou um elevado índice de diversidade de Shannon (H' = 4,258 nats/indivíduo, correlacionado à baixa dominância ecológica (alta equabilidade de Pielou, J' = 0,862 e, possivelmente, à alta heterogeneidade ambiental local. A CCA demonstrou que a heterogeneidade ambiental do fragmento é caracterizada principalmente pela topografia acidentada e pelas variações de fertilidade, granulometria e regime hídrico dos solos, sendo este último o mais fortemente correlacionado com a distribuição das espécies. Muitas espécies arbóreas mostraram clara preferência por dois habitats: a baixa encosta, com solos mais úmidos e férteis, e a alta encosta, com solos menos úmidos e f

  5. Genetic variations among passion fruit species using rapd markers Variação genética entre espécies de maracujá utilizando marcadores rapd

    Directory of Open Access Journals (Sweden)

    Ana Paula de Andrade Aukar

    2002-12-01

    Full Text Available It has been evaluated the genetic variability through the use of RAPD molecular markers on the following passionflower species: Passiflora amethystina, P. caerulea, P. cincinnata, P. coccinea, P. serrato digitata, P. foetida, P. maliformis, P. alata, P. giberti, P. laurifolia, P. macrocarpa, P. nitida, P. setacea, P. suberosa, P. ligularis, P. capsularis, P. edulis Sims and its botanical variety P. edulis Sims f. flavicarpa Deg. In this research work, the analyses of the random amplified polymorphic DNA products (RAPD were employed to estimate the genetic diversity and the taxonomic linkage within the species above. The total of 21 primers were used in this study which generated 270 different polymorphic products. It was possible to detect that the Passiflora species had shown a similarity of 17,3%, and between Passiflora edulis Sims and Passiflora edulis Sims f. flavicarpa a similarity of 34,35% has been found. The rate of similarity within edulis specie is low, making it clear that a large variability between the yellow and the purple forms exists.Foram avaliadas as variações genéticas através de marcadores moleculares RAPD, as seguintes espécies de maracujá: Passiflora amethystina, P. caerulea, P. cincinnata, P. coccinea, P. serrato digitata, P. foetida, P. maliformis, P. alata, P. giberti, P. laurifolia, P. macrocarpa, P. nitida, P. setacea, P. suberosa, P. ligularis, P. capsularis, P. edulis Sims e sua variedade botânica P. edulis Sims f. flavicarpa Deg. Neste estudo, a análise dos produtos da amplificação ao acaso do DNA polimórfico (RAPD foi usada para estimar a diversidade genética e as relações taxonômicas entre as espécies. Foram utilizados 21 "primers", que produziram um total de 270 bandas polimórficas. Verificou-se que as espécies de Passiflora apresentaram uma média de similaridade de 17,3%, e entre Passiflora edulis Sims e Passiflora edulis Sims f. flavicarpa, de 34,35%. Pode-se perceber que o valor de

  6. Variação da contagem de células somáticas em vacas leiteiras de acordo com patógenos da mastite Somatic cell counts variation in dairy cows according to mastitis pathogens

    Directory of Open Access Journals (Sweden)

    G.N. Souza

    2009-10-01

    Full Text Available Avaliou-se o efeito de patógenos da mastite sobre a contagem de células somáticas (CCS em leite. Foram coletadas 3.987 amostras de leite de 2.657 animais oriundos de 24 rebanhos leiteiros localizados nos estados do Rio de Janeiro e Minas Gerais. As amostras de leite foram usadas para CCS e identificação de patógenos da mastite. Estatísticas descritivas, teste T para amostras independentes e modelo linear generalizado foram usados para análise dos dados. O modelo linear generalizado identificou os efeitos de rebanho, animal dentro de rebanho, ordem de parto, estação do ano e infecção intramamária causada por Streptococcus agalactiae e Streptococcus spp. que não S. agalactiae como significativos na variação da CCS. O efeito de animal dentro de rebanho foi maior que o efeito de rebanho. S. agalactiae foi o patógeno responsável pelo maior aumento da CCS em vacas e apresentou em média 1.520.000 células/mL. Foi observado efeito específico dos patógenos na variação da CCS.The influence of mastitis pathogens on variation of milk somatic cell count (SCC was evaluated. Three thousand nine hundred eighty-seven milk samples were colected from 2,657 dairy cows in 24 herds located in the states of Minas Gerais and Rio de Janeiro. The milk samples were used to SCC and identification of mastitis pathogens. Descriptive statistics, T test for independent samples, and generalized linear model were used to data analysis. The generalized linear model identified the effects of herd, animal within herd, parity, year season, intramammary infection, and infection caused by Streptococcus agalactiae and Streptococcus spp. except S. agalactiae as significant on SCC variation. The effect of animal within herd was higher than the effect of herd. S. agalactiae was the pathogen responsible for higher SCC increasing and presented the average of 1,520,000 cells/mL. The specific effect on SCC variation was observed in the study.

  7. Teaching and Learning Immersion and Presence

    DEFF Research Database (Denmark)

    Herbelin, Bruno; Ciger, Jan

    2008-01-01

    It is known since Socrates that people learn better by experiencing a problem by themselves and by finding a (the) solution(s) by their own. It is however not always possible to offer such freedom to students when teaching the concepts of immersion and presence in virtual environments due......-presence, and observe the inherent problems liked to  communication, field of view, or latency issues. The test performed shows that such experimentation have positive pedagogical impacts, both from the learning and students motivation perspectives....

  8. Connections and lingering presence as cocreated art.

    Science.gov (United States)

    Dempsey, Leona F

    2008-10-01

    Parse described nursing practice as a performing art where the nurse is like a dancer. Just as in any dance performance, unplanned events may occur. When a nurse is artistically living, unique and meaningful performances might emerge from unplanned events. In this practice column, the author describes how shifting experiences surfaced with unforeseen connections and lingering presence during her study of feeling confined. In her study she was in true presence with men living in prison, who were diagnosed with severe mental illness. The humanbecoming school of thought was the nursing perspective guiding the research study.

  9. Designing for Active Place Presence at Home

    DEFF Research Database (Denmark)

    Ylirisku, Salu; Jylhä, Antti; Lehtiö, Anu

    2016-01-01

    Technological support for augmenting the relationship that people establish with remote places has been studied fairly little as the primary focus in telepresence studies is the connection between people. This paper addresses the design challenge for supporting ‘active place presence’ at home...... to be considered when designing for active place presence at home........ A prototype, Hole in Space, was created to explore the design challenge. A longitudinal study of how an urban couple appropriated the prototype was conducted over the duration of seven months. The paper elaborates on how the Web-mediated design influenced place presence and outlines several aspects that need...

  10. Performing Presence in the Pop Art Lab

    DEFF Research Database (Denmark)

    Strand, Dixi Louise

    2011-01-01

    they come together to create an event of presence. The paper relates how this object of study is approached, and produced, through a series of methods. Methods such as participant observation, interviews, reading of blogs and web texts are understood as mediations. The paper traces how these mediations...

  11. Presence in Virtual Reality Exposure Therapy Systems

    NARCIS (Netherlands)

    Ling, Y.

    2014-01-01

    Experiencing anxiety is essential for virtual reality exposure therapy (VRET) to be effective in curing patients suffering from anxiety disorders. However, some patients drop out in VRET due to the lack of feeling anxiety. Presence - which refers to the feeling of being in the virtual environment -

  12. Stay the Course: Managing Online Presence

    Science.gov (United States)

    Fredrick, Kathy

    2009-01-01

    How can a school librarian share instruction and information with students and colleagues in the virtual world? Library Web pages make resources available 24/7. New tools available to schools can also give new options in making a Web presence known. This article suggests a plan for school librarians on how they can manage their libraries' online…

  13. 31 CFR 91.3 - Recording presence.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 1 2010-07-01 2010-07-01 false Recording presence. 91.3 Section 91.3 Money and Finance: Treasury Regulations Relating to Money and Finance REGULATIONS GOVERNING CONDUCT IN... exists, and at such other times as may be necessary for the orderly conduct of the Government's business...

  14. 31 CFR 407.3 - Recording presence.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 2 2010-07-01 2010-07-01 false Recording presence. 407.3 Section 407.3 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued) SECRET SERVICE... business of the Treasury Department. The property shall also be closed to the public when, in the opinion...

  15. Supernumerary epidermal shields and carapace variation in Orbigny's slider turtles, Trachemys dorbigni (Testudines, Emydidae Escudos epidérmicos supernumerários e variação na carapaça na tartaruga-tigre-d'água, Trachemys dorbigni (Testudines, Emydidae

    Directory of Open Access Journals (Sweden)

    Clóvis S. Bujes

    2007-01-01

    Full Text Available The epidermal plates of the carapace and plastron of 51 adults (38 females and 13 males, 07 immature individuals, and 46 hatchlings of the freshwater turtle Trachemys dorbigni (Durémil & Bibron, 1835, originated from the delta of Rio Jacuí region, Rio Grande do Sul state, Brazil, were examined. The results showed that 7.7% of males, 10.52% of females, 14.28% of immature individuals, and 6.52% of the hatchlings presented a kind of anomaly on the shell, as well as a presence of supernumerary epidermal shields. Although the modification in the number of epidermal shields presents a high frequency in Testudines, these are the first descriptions of the variation in the pattern of carapacial scutation in eleven individuals from a population of T. dorbigni. The association of several environmental factors acting on the embryonic development of the individual may be responsible for the alteration of the pattern of carapacial scutation in this species.Os escudos epidérmicos da carapaça e do plastrão de 51 adultos (38 fêmeas e 13 machos, 07 imaturos e 46 filhotes da tartaruga de água doce Trachemys dorbigni (Durémil & Bibron, 1835, procedentes da região do delta do Rio Jacuí, Rio Grande do Sul, Brasil, foram examinados. Desta análise, 7,7% dos machos, 10,52% das fêmeas, 14,28% dos imaturos e 6,52% dos filhotes apresentaram algum tipo de anomalia no casco, bem como presença de escudos epidérmicos supernumerários. Embora a alteração no número dos escudos epidérmicos seja relativamente freqüente em Testudines, estas são as primeiras descrições de variação no padrão de escutelação em onze indivíduos de uma população de T. dorbigni. A associação de diferentes fatores ambientais, interagindo sobre o desenvolvimento embrionário do indivíduo, parece ser a responsável pela alteração do padrão de escutelação nessa espécie.

  16. Uma Avaliação da Variação da Temperatura da Superfície do Mar durante a Passagem do Furacão Catarina

    Directory of Open Access Journals (Sweden)

    Rodrigo Carvalho de Sousa

    2016-01-01

    Full Text Available Neste trabalho tenta-se observar a variação da temperatura da superfície do mar (TSM durante a passagem do ciclone tropical que atingiu a costa leste do Brasil em 2004, conhecido como furação Catarina, utilizando dados de temperatura da superfície do mar estimado via sensoriamento remoto orbital provenientes de dois sensores nos espectros de micro-ondas e infravermelho termal. Os resultados apontam que houve resfriamento máximo de aproximadamente 2,00o C quando comparados com dados de anos subsequentes ao evento. Além disso, os resultados indicaram, conforme esperado, que durante a passagem do Catarina o resfriamento da TSM realmente ocorreu, atingindo os valores máximos de -1,00o C e -0,99o C quando comparados com a TSM diária do sensor TMI e a composição diária de TSM usando dados dos sensores TMI e AVHRR (via método de interpolação de Barnes, respectivamente. Estimativa de TSM via dados infravermelho pouco contribuiu na análise, enquanto os dados de TSM micro-ondas apresentaram uma razoável capacidade de representar o comportamento qualitativo da TSM durante o evento Catarina. Os resultados estão em conformidade com os encontrados na literatura

  17. Clonal variation within a mucosal isolate derived from a patient with Leishmania (Viannia braziliensis infection Variação clonal de um isolado derivado de um paciente com infecção mucosa pela Leishmania (Viannia braziliensis

    Directory of Open Access Journals (Sweden)

    César Augusto Cuba-Cuba

    1991-10-01

    Full Text Available Three isolates over 5 years from a patient with persistent relapsing mucosal leishmaniasis due to Leishmania (Viannia braziliensis and 7 clones from one of these isolates were studied by zymodemes and scrodemes analysis. Results showed evidences of clonal phenotypic variation. Eight isoenzymes markers demonstrated clear differences on Cellulose Acetate (CA and thin starch gel electrophoresis. Also a panel of specific monoclonal antibodies showed such differences. Our observations provide additional evidence that Leishmania (Viannia braziliensis is composed by subpopulations of parasites with peculiar biochemical and antigenic characteristics.No transcurso de um período de 5 anos foram estudados 3 isolados de um paciente com leishmaniose mucosa recidivante causada pela Leishmania (Viannia braziliensis e 7 clones de um desses isolados. Este estudo foi feito pela análise dos serodemas e zimodemas. Os resultados indicaram a ocorrência de variações fenotípicas clonais. Oito marcadores isoenzimáticos demonstraram diferenças nos padrões eletroforéticos em Acetato de Celulose (AC, bem como em camada fina de amido. Da mesma forma foram consultadas diferenças em um painel de anticorpos monoclonais específicos e subespecíficos. Nossas observações indicam ainda que a Leishmania (Viannia braziliensis está composta por subpopulações de parasitas com características bioquímicas e antigênicas peculiares.

  18. Leishmaniose tegumentar americana na Ilha Grande, Rio de Janeiro: VI. observações sobre a freqüência horária e variação mensal dos transmissores

    Directory of Open Access Journals (Sweden)

    Nelson A. de Araújo Filho

    1981-12-01

    Full Text Available Para estudo da freqüência horária dos principais vetores da Leishmaniose Tegumentar Americana (LTA, na Ilha Grande, durante os anos de 1976 a 1977, foram realizadas 4 capturas de 24 horas com isca animal (cão, ao ar livre, e 5 capturas de 24 horas em um único domicilio da área. Observou-se que a espécie Lutzomyia intermedia ocorreu durante todo o período noturno, com densidade constante no domicílio humano, enquanto a espécie Lutzomyia migonei apresentou maiores densidades no período da madrugada, nas capturas com isca animal (cão. Em 156 horas de estudo sobre variação mensal, durante o período de março de 1976 a fevereiro de 1977, a espécie L. intermedia ocorreu durante todo o ano, sendo abril, maio, outubro e dezembro os meses de maior densidade; a espécie L. migonei apresentou-se com baixa densidade, chegando a desaparecer no mês de setembro. As elevadas densidades das espécies L. intermedia e L. migonei indicam-nas como as prováveis vetoras de LTA na Ilha Grande.

  19. Modelos de crescimento resultantes da combinação e variações dos modelos de Chapman-Richards e Silva-Bailey aplicados em Leucaena leucocephala (Lam. de Wit.

    Directory of Open Access Journals (Sweden)

    Cícero Carlos Ramos de Brito

    2010-08-01

    Full Text Available O objetivo deste trabalho foi desenvolver novos modelos de crescimento para recursos florestais aplicados à leucena [Leucaena leucocephala (Lam. de Wit], tendo como base as hipóteses biológicas propostas por Chapman-Richards e Silva-Bailey. O experimento de leucena foi conduzido na Estação Experimental da Empresa Pernambucana de Pesquisa Agropecuária - IPA, Caruaru, PE. Foram utilizadas 544 árvores de leucena de um experimento com vinte remedições realizadas ao longo de 12 anos. Compararam-se novos modelos de crescimento resultantes da combinação e variações dos modelos de Chapman-Richards e Silva-Bailey, bem como outros comumente usados em recursos florestais. Para a seleção das equações, utilizaram-se o Índice de Ajuste (IA, o erro-padrão da estimativa e a distribuição gráfica dos resíduos. Os resultados indicaram que todos os modelos testados se ajustaram de maneira satisfatória aos dados, podendo ser utilizados para se estimar o crescimento em altura da leucena.

  20. Intragroup emotions: physiological linkage and social presence

    Directory of Open Access Journals (Sweden)

    Simo eJärvelä

    2016-02-01

    Full Text Available We investigated how technologically mediating two different components of emotion – communicative expression and physiological state – to group members affects physiological linkage and self-reported feelings in a small group during video viewing. In different conditions the availability of second screen text chat (communicative expression and visualization of group level physiological heart rates and their dyadic linkage (physiology was varied. Within this four person group two participants formed a physically co-located dyad and the other two were individually situated in two separate rooms. We found that text chat always increased heart rate synchrony but HR visualization only with non-co-located dyads. We also found that physiological linkage was strongly connected to self-reported social presence. The results encourage further exploration of the possibilities of sharing group member’s physiological components of emotion by technological means to enhance mediated communication and strengthen social presence.

  1. Distraction as a measure of presence

    DEFF Research Database (Denmark)

    Nordahl, Rolf; Korsgaard, Dannie

    2010-01-01

    ) to determine presence as immersion (Lombard and Ditton in At the heart of it all: the concept of presence, Department of Broadcasting, Telecommunications and Mass Media, Temple University, 1997) at selectable events (approximated real-time). Two experiments were conducted to investigate its applicability......To assess and improve the user experience in entertainment products, developers need results of evaluation methods, which in detail measure the relationship between the mediated content and the resulting media experience. This paper proposes a method applying adjustable distraction (AD...... in computer games and movies with respectively visual and tactile AD. The first experiment examined whether the experienced intensity in a survival-shooter game, measured through questionnaires, was proportional to results from the AD method. The intrusiveness of the AD method was also addressed...

  2. Vitrification in the presence of salts

    International Nuclear Information System (INIS)

    Marra, J.C.; Andrews, M.K.; Schumacher, R.F.

    1994-01-01

    Glass is an advantageous material for the immobilization of nuclear wastes because of the simplicity of processing and its unique ability to accept a wide variety of waste elements into its network structure. Unfortunately, some anionic species which are present in the nuclear waste streams have only limited solubility in oxide glasses. This can result in either vitrification concerns or it can affect the integrity, of the final vitrified waste form. The presence of immiscible salts can also corrode metals and refractories in the vitrification unit as well as degrade components in the off-gas system. The presence of a molten salt layer on the melt may alter the batch melting rate and increase operational safety concerns. These safety concerns relate to the interaction of the molten salt and the melter cooling fluids. Some preliminary data from ongoing experimental efforts examining the solubility of molten salts in glasses and the interaction of salts with melter component materials is included

  3. Intragroup Emotions: Physiological Linkage and Social Presence.

    Science.gov (United States)

    Järvelä, Simo; Kätsyri, Jari; Ravaja, Niklas; Chanel, Guillaume; Henttonen, Pentti

    2016-01-01

    We investigated how technologically mediating two different components of emotion-communicative expression and physiological state-to group members affects physiological linkage and self-reported feelings in a small group during video viewing. In different conditions the availability of second screen text chat (communicative expression) and visualization of group level physiological heart rates and their dyadic linkage (physiology) was varied. Within this four person group two participants formed a physically co-located dyad and the other two were individually situated in two separate rooms. We found that text chat always increased heart rate synchrony but HR visualization only with non-co-located dyads. We also found that physiological linkage was strongly connected to self-reported social presence. The results encourage further exploration of the possibilities of sharing group member's physiological components of emotion by technological means to enhance mediated communication and strengthen social presence.

  4. ATTACHMENT, RELATIONAL-NEEDS, AND PSYCHOTHERAPEUTIC PRESENCE

    Directory of Open Access Journals (Sweden)

    Richard G. Erskine

    2012-09-01

    Full Text Available Humans require the contactful presence of another person who is attuned and responsive to relational-needs. Insecure attachment patterns are the result of repeated disruptions in significant relationships. This article describes eight relational-needs that, when repeatedly unsatisfied, lead to insecure attachment patterns based on the fears of loss of relationship, vulnerability, violation, and invasion.The healing of insecure attachment patterns occurs through a contactful psychotherapeutic presence that occurs when the attitude, behavior and communication of the psychotherapist consistently respects and enhances the client's integrity while responding to relational-needs. The article is the Keynote Address given at the 5th International Integrative Psychotherapy Association Conference in Vichy, France, April 21, 2011.

  5. Intragroup Emotions: Physiological Linkage and Social Presence

    Science.gov (United States)

    Järvelä, Simo; Kätsyri, Jari; Ravaja, Niklas; Chanel, Guillaume; Henttonen, Pentti

    2016-01-01

    We investigated how technologically mediating two different components of emotion—communicative expression and physiological state—to group members affects physiological linkage and self-reported feelings in a small group during video viewing. In different conditions the availability of second screen text chat (communicative expression) and visualization of group level physiological heart rates and their dyadic linkage (physiology) was varied. Within this four person group two participants formed a physically co-located dyad and the other two were individually situated in two separate rooms. We found that text chat always increased heart rate synchrony but HR visualization only with non-co-located dyads. We also found that physiological linkage was strongly connected to self-reported social presence. The results encourage further exploration of the possibilities of sharing group member's physiological components of emotion by technological means to enhance mediated communication and strengthen social presence. PMID:26903913

  6. 'Presence' of the past in the presence (Hans Ulrich Gumbrecht, Eelco Runia)

    NARCIS (Netherlands)

    ter Schure, L

    2006-01-01

    In recent writings historian Eelco Runia (Groningen) and literary theorist Hans Ulrich Gumbrecht (Stanford) have introduced the notion of presence, a new and promising way of thinking about history. Although there are differences between the two authors, both think of presence as the antithesis of

  7. HOLISTIC APPROACH FOR ASSESSING THE PRESENCE ...

    Science.gov (United States)

    As an integral part of our continuing research in environmental quality assessment approaches, we have developed a variety of passive integrative sampling devices widely applicable for use in defining the presence and potential impacts of a broad array of contaminants. The semipermeable membrane device (SPMD) has gained widespread use for sampling hydrophobic chemicals from water and air, the polar organic chemical integrative sampler (POCIS) is applicable for sequestering waterborne hydrophilic organic chemicals, the stabilized liquid membrane device (SLMD) is used to integratively sample waterborne ionic metals, and the passive integrative mercury sampler (PIMS) is applicable for sampling vapor phase or dissolved neutral mercury species. This suite of integrative samplers forms the basis for a new passive sampling approach for assessing the presence and potential toxicological significance of a broad spectrum of environmental contaminants. In a proof-of-concept study, three of our four passive integrative samplers were used to assess the presence o,f a wide variety of contaminants in , the waters of a constructed wetland, and to determine the effectiveness of the constructed wetland in removing contaminants. The wetland is used for fmal polishing of secondary- treatment municipal wastewater and the effluent is used as a source of water for a state wildlife area. Numerous contaminants, including organochlorine pesticides (OCs), polycyclic aromatic hydrocarbons

  8. Os sistemas atmosféricos e a variação do tempo em Maringá, Estado do Paraná, Brasil = Atmosphere systems and weather variations in Maringá, Paraná State, Brazil

    Directory of Open Access Journals (Sweden)

    Leonor Marcon da Silveira

    2006-01-01

    Full Text Available O município de Maringá, atravessado pelas coordenadas de 23º27´S e51º57´W, situa-se no Norte do Estado do Paraná - Brasil. Verifica-se aí acentuada variação do tempo atmosférico, decorrente da alternância de sistemas atmosféricos tropicais e extratropicais. O presente estudo teve por objetivo investigar as variações diárias doselementos climáticos à superfície em Maringá e suas relações com os sistemas atmosféricos geradores dos diferentes tipos de tempo que atuaram durante o outono e o inverno de 1996. Objetivou também averiguar as relações entre a atuação da Frente Polar Atlântica (FPA e a pluviosidade local. Elegeu-se o ano de 1996 por apresentar neutralidade em relação aos fenômenos El Niño e La Niña. Esse estudo apoiou-se na concepção dinâmica de clima e na metodologia da análise rítmica. Constatou-se que, durante o período em estudo, todas aschuvas decorreram, direta ou indiretamente, da Frente Polar Atlântica (FPA. Constatou-se também que a pluviosidade esteve mais relacionada com a duração dos sistemas frontais do que com o número de passagens desses sistemas pela região. As temperaturas muito baixas decorreram principalmente das incursões de sistemas polares interiorizados e geralmente ocorreram quando as frentes não promoveram chuva.The municipality of Maringá, 23°27' S and 51°57' W, lies in the north State of Paraná, southern Brazil. Pronounced atmosphere variations are due to alternations in tropical and extra-tropical atmosphere systems. Daily variations of surface climate factors in Maringá and their relationships with atmospheric systems which cause different types of weather during autumn and winter of 1996 have been investigated. The relationship between the activities of the Atlantic Polar Front (APF and local rainfall has also been analyzed. The year 1996 has been chosen because of the absence of the El Niño and LaNiña phenomena. The analysis was based on the dynamic

  9. Variação de terpenos em Hyptis suaveolens e seu papel na defesa contra herbívoros The role of terpene variation in Hyptis suaveolens in the defense against herbivores

    Directory of Open Access Journals (Sweden)

    Rachel Benetti Queiroz-Voltan

    1995-01-01

    Full Text Available Acompanhou-se o desenvolvimento de populações de Hyptis suaveolens (L. Poit. (Labiatae em três localidades paulistas: Horto Florestal de Sumaré, Câmpus da UNICAMP (Campinas e Fazenda Santa Genebra (Distrito de Barão Geraldo, Campinas, em 1981-83. Em cada local, escolheu-se uma população exposta à luz e outra, à sombra, com o objetivo de verificar em que fase do ciclo de vida as populações se tornavam mais suscetíveis ao ataque de herbívoros; de estimar a abundância dos herbívoros naturais e seus efeitos nas populações e a conseqüência da variação química dos monoterpenos que nelas ocorrem sobre os herbívoros. As populações tornavam-se mais suscetíveis aos herbívoros no período que antecedia a floração. Não se observou forte ataque de herbívoros nessa fase, embora se apresentassem em maior densidade. Os resultados sugerem que a variação na composição química possa afetar o desenvolvimento de herbívoros generalistas. No entanto, o Pyrausta insignatalis Guenée (Lep.-Pyralidae-Pyraustinae, provavelmente bem adaptado à planta, parece não ter sido afetado por esses terpenos. Não se detectaram diferenças entre populações expostas ao sol ou à sombra. Tais resultados apóiam a idéia de que a variabilidade química dentro de populações vegetais é importante estratégia de defesa contra herbívoros, dificultando-lhes a especialização.Populations of Hyptis suaveolens (L. Poit. (Labiatae were accompanied during their development in three sites: Horto Florestal de Sumaré, Campus of UNICAMP (Campinas, and Fazenda Santa Genebra (Distrito de Barão Geraldo, Campinas, all in the State of São Paulo, Brazil, from 1981 through 1983. At each site, a population exposed to full sunlight and another in the shade were studied. The objective was to evaluate, during plant development, the period when they were more susceptible to attack by herbivores; to consider the abundance of herbivores, and the role of variation

  10. Small relief shape variations influence spatial variability of soil chemical attributes Pequenas variações das formas de relevo influenciam a variabilidade espacial de atributos químicos do solo

    Directory of Open Access Journals (Sweden)

    Zigomar Menezes de Souza

    2006-04-01

    Full Text Available Soils with small variations in relief and under the same management system present differentiated spatial variabilities of their attributes. This variability is a function of soil position in the landscape, even if the relief has little expression. The aim of this work was to investigate the effects of relief shape and depth on spatial variability of soil chemical attributes in a Typic Hapludox cultivated with sugar cane at two landscape compartments. Soil samples were collected in the intercrossing points of a grid, in the traffic line, at 0-0.2 m and 0.6-0.8 m depths, comprising a set of 100 georeferenced points. The spatial variabilities of pH, P, K, Ca, Mg, cation exchange capacity and base saturation were quantified. Small relief shape variations lead to differentiated variability in soil chemical attributes as indicated by the dependence on pedoform found for chemical attributes at both 0-0.2 m and 0.6-0.8 m depths. Because of the higher variability, it is advisable to collect large number of samples in areas with concave and convex shapes. Combining relief shapes and geostatistics allows the determination of areas with different spatial variability for soil chemical attributes.Solos submetidos ao mesmo sistema de manejo em locais com pequena variação de relevo, manifestam variabilidade espacial diferenciada de seus atributos. Esta variabilidade é condicionada pela posição dos solos na paisagem ou no declive, mesmo que o relevo seja de pequena expressão. O estudo teve como objetivo avaliar a influência da forma do relevo na variabilidade espacial de atributos químicos em um latossolo cultivado com cana-de-açúcar em dois compartimentos da paisagem. Os solos foram amostrados nos pontos de cruzamento de uma malha, com intervalos regulares de 10 m, perfazendo um total de 100 pontos, nas profundidades de 0-0,2 m e 0,6-0,8 m. Foi avaliado a variabilidade espacial do pH, fósforo (P, potássio (K, cálcio (Ca, magnésio (Mg, acidez

  11. Variação interobservador no diagnóstico histopatológico do carcinoma ductal in situ da mama Interobserver variation of the histopathologic diagnosis of ductal carcinoma in situ of the breast

    Directory of Open Access Journals (Sweden)

    Márcio de Almeida Salles

    2005-01-01

    Full Text Available OBJETIVOS: fazer avaliação crítica do diagnóstico histopatológico do carcinoma ductal in situ (CDIS da mama empregando a variação interobservador quanto ao diagnóstico, padrão arquitetural predominante, grau nuclear e grau histológico. MÉTODOS: oitenta e cinco casos com diagnóstico inicial de CDIS foram revisados por um mesmo patologista, especialista em patologia mamária, que selecionou 15 casos para análise interobservador. A análise foi realizada por cinco patologistas e um especialista internacional em patologia mamária, que receberam as mesmas lâminas e um protocolo para classificar as lesões em hiperplasia ductal atípica (HDA, CDIS e CDIS com microinvasão (CDIS-MIC. Caso o diagnóstico fosse de CDIS, os patologistas deveriam também classificá-lo quanto ao padrão arquitetural, grau nuclear e grau histológico. Os resultados foram analisados usando-se concordância percentual e o teste kappa. RESULTADOS: houve grande variação diagnóstica interobservador. Em um caso tivemos todos os diagnósticos, desde HDA, CDIS até CDIS-MIC. Usando o teste kappa para a comparação entre os diagnósticos dos cinco observadores e o especialista internacional obtivemos concordância interobservador mínima (PURPOSE: to perform a critical evaluation of the histopathological diagnosis of ductal carcinoma in situ (DCIS of the breast, through the analysis of interobserver variation related to diagnosis, architectural pattern, nuclear grade, and histological grade. METHODS: eighty-five cases with an initial diagnosis of DCIS were reviewed by the same pathologist, specialist in breast pathology, who selected 15 cases for interobserver analysis. The analysis was carried out by five pathologists and an international expert in breast pathology, who received the same slides and a protocol for classifying the lesions as atypical ductal hyperplasia (ADH, DCIS, or ductal carcinoma in situ with microinvasion (DCIS-MIC. If the diagnosis was DCIS

  12. Radial variation of wood anatomy and basic density of Anadenanthera colubrina (Vell. Brenan. Variação radial da anatomia e densidade básica da madeira de Anadenanthera colubrina (Vell. Brenan.

    Directory of Open Access Journals (Sweden)

    Eduardo Luiz LONGUI

    2014-12-01

    Full Text Available We investigated wood samples of five Anadenanthera colubrina trees, aiming to study radial variation of anatomy and basic density. The trees were cut from “lote 5 do Rodoanel trecho sul” in Embu municipality, State of São Paulo, where vegetation is classified as Montane Ombrophilous Dense Forest and climate is classified as Cwa. We cut discs from the diameter at breast height ‒ DBH, and then cut samples from pith-to-bark to anatomical and basic density analysis. The results suggest that Anadenanthera colubrina has a very common anatomical and basic density radial variation pattern from pith-to-bark between hardwoods with an increase in vessel diameter favoring hydraulic conductivity, fiber wall thickness and length, ray height and width, and basic density. While the negative relationship between vessel diameter and frequency is well reported for many species, it has not been observed in A. colubrina because vessel frequency oscillates radially. This typical radial pattern also occurs in other native species in planting conditions, already demonstrated by our group in other studies, obviously with some changes depending on species. Investigamos amostras de madeira de cinco árvores de Anadenanthera colubrina objetivando estudar a variação radial da anatomia e densidade básica. As árvores foram cortadas no lote 5 do Rodoanel trecho sul, no município de Embu, com a vegetação de Floresta Ombrófila Densa Montana e clima do tipo Cwa. Cortamos discos à altura do peito ‒ DAP e destes obtivemos amostras radiais da medula para a casca, destas preparamos amostras para a determinação anatômica e da densidade básica. Os resultados sugerem que Anadenanthera colubrina apresenta um padrão radial de variação bastante comum no sentido medula-casca para as angiospermas arbóreas, com aumento no diâmetro dos vasos, consequentemente condutividade hidráulica, comprimento e espessura da parede da fibra, altura e largura do raio e densidade b

  13. Ethereal presences in holography and photography

    Science.gov (United States)

    Richardson, M.; Byrne, Kay

    2007-02-01

    This paper examines the concept of the 'Presence of Absence' in post-mortem photography and holography, drawing upon both historical and lesser-known images as reference. To create a photographic negative one needs the presence of light to expose the light sensitive surface, be it glass, a polished plate or plastic. A hologram may also be created when a coherent light source, for example from a Laser, travels through a light sensitive material and falls upon the subject to be recorded. A holograph however, retains the optical qualities of both phase and amplitude, the memory of light. Both mediums recall, as it were, 'now absent moments', and confronts us with what is 'not there' as much as 'what is'. This paper examines the exploration of absence and presence in post-mortem photography and holography and it's a richly visceral visual language. A photonic syntax can interpret death as an elegant yet horrific aesthetic, the photograph may be beautify screened and yet obscene in its content. In essence one can be a voyeur, experiencing a mere visual whisper of the true nature of the subject. Our Victorian forefathers explored postmortem photography as an object of mourning, and at the close of the nineteenth century when Jack the Ripper had the inhabitants of White Chapel in a grip of fear, photography made its mark as a documentation of violent crime. Today, within contemporary photography, death is now presented within the confines of the 'Art Gallery', as a sensual, and at times, sensationalised art form. In exploring post-mortem imagery, both in holography and conventional photography, absence presents an aspect of death as startling in its unanimated form and detailed in its finite examination of mortality.

  14. Estudos sôbre reservatórios e vectores silvestres do Trypanosoma cruzi. XXIV. Variação dos dados biométricos obtidos em amostras do T. cruzi isolados de casos humanos da Doença de Chagas

    Directory of Open Access Journals (Sweden)

    Francisco Ferriolli Filho

    1968-02-01

    Full Text Available Estudo biométrico de 10 amostras de Trypanosoma cruzi isoladas de casos humanos da doença de CHAGAS, nove mantidas em camundongos brancos jovens e uma mantida em ratos brancos jovens, mostrou a existência de grandes variações amostrais. Assim os valores do comprimento total médio das diferentes amostras variaram entre 16,3μ e 21,8μ., enquanto os valores do índice nuclear médio oscilaram entre 0,93 e 1,52. Êstes resultados ampliam os limites de variações amostrais até agora observadas no T. cruzi, especialmente os que se referem ao índice nuclear médio.

  15. Presence Experiences - the eventalisation of urban space

    DEFF Research Database (Denmark)

    Pløger, John

    2010-01-01

    Cultural events are, as part of an urban development strategy, about (symbolic) representations, but for the human beings participating in the event it may include acts of in/visibility (anonymity versus expressivity) and different articulations of meaning or subjectivity in space. A particular...... of space that make these events a desired experience and the qualities of the presence-experience more desired than, for instance, the political content of the event. Why it is so is theoretically and philosophically explored by discussing the expressive signification of such events. If expressive...

  16. Hall effect in the presence of rotation

    Science.gov (United States)

    Zubkov, M. A.

    2018-02-01

    A rotating relativistic fermion system is considered. The consideration is based on the Dirac equation written in the laboratory (non-rotating) reference frame. Rotation in this approach gives rise to the effective magnetic and electric fields that act in the same way both on positive and negative electric charges. In the presence of external electric field in the given system the electric current appears orthogonal to both the electric field and the axis of rotation. The possible applications to the physics of quark-gluon plasma are discussed.

  17. Presence of pRI1:

    DEFF Research Database (Denmark)

    Migura, Lourdes Garcia; Hasman, Henrik; Jensen, Lars Bogø

    2009-01-01

    This study focused on the molecular characterization of a small cryptic, mobilizable plasmid (6038 bp) sequenced from an E. faecium 9631160-1 of poultry origin. Sequence analysis of pRI1 revealed seven open reading frames. pRI1 contained an IS 100% identical to ISEfa4. This insertion element...... almost identical to the repA from the pEFNP1 and pKQ10 plasmids from E. faecium was also identified. Presence of the pRI1 replication initiation gene (rep) was analyzed in a panel of 159 E. faecium isolates of human and animal origin from different European countries, of which 60 tested positive...

  18. From Music Presenters to Social Presence

    DEFF Research Database (Denmark)

    Have, Iben

    instance the end of monopoly in 1983) as well as present competing technological developments of music streaming services. By using the Danish radio archive (larm.fm) supplied by the Internet archive (netarkivet.dk) the paper will present a mapping of hosts and host constellations in Go’ Morgen P3 (1989......-2011). On that basis the main part of the paper will consist of close analyses of 4-6 selected programs covering the period. From a phenomenological approach these case studies will investigate classical radio values like presence, liveness and socialbility (Scannell 1996, 2014): what is being said and how, how...

  19. Presence of moulds and mycotoxins in spices

    Directory of Open Access Journals (Sweden)

    Karan Dragica D.

    2005-01-01

    Full Text Available In this paper there are presented the results of mycologic and mycotoxicologic analysis of seven spices which are being used for production of meat products. Using standard mycologic methods, in all the tested samples, we noticed a presence of moulds. By quality and quantity, most represented are genera: Aspergillus and Penicillium. With smaller occurrence there are presented genera: Rhizopus, Mucor, Paecylomyces and Absydia. Mycotoxins - ochratoxin, aflatoxins and zearalenon, are detected in samples of ground white pepper, ginger, cloves and ground caraway.

  20. Variação anual na abertura do dossel, temperatura e umidade do ar no sub-bosque de três ambientes florestais no sul da Bahia, Brasil

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    Marayana Prado Pinheiro

    2013-03-01

    Full Text Available http://dx.doi.org/10.5902/198050988445Visando contribuir para o conhecimento dos fatores físicos que afetam a estrutura da comunidade vegetal em remanescentes de mata atlântica do sul da Bahia foi analisada a variação anual do microclima do sub-bosque num fragmento de floresta de encosta na Reserva Particular do Patrimônio Natural Serra do Teimoso (RST e num sistema agroflorestal rústico utilizado para o cultivo do cacau (Cabruca, localizado nas proximidades da RST. Dados da abertura do dossel (CO, da temperatura do ar (Ta, da umidade relativa do ar (RH e do déficit de pressão de vapor (VPD foram coletados entre abril de 2005 e abril de 2006 na base (RSTB, 340 m e no topo (RSTT, 640 m da RST e na Cabruca (CB, 250 m. Dados de precipitação pluvial, Ta, RH e VPD foram também coletados numa área aberta (OA, 270 m. As maiores precipitações (> 100 mm ocorreram em Novembro de 2005 e Abril de 2006, enquanto outubro de 2005 foi o mês mais seco (< 20 mm. CO variou entre 2,5% na CB (Abril, 2006 e 7,7% na RST (Outubro, 2005. Os baixos valores de pluviosidade registrados em Outubro de 2005 afetaram VPDmax em todos os ambientes. Estes efeitos foram mais pronunciados em OA, seguido de CB, RSTB e RSTT. Os valores de Ta, RH e VPD em CB foram mais próximos aos valores observados em OA do que aos valores observados no interior da floresta.

  1. Estudo Sobre a Decomposição dos Determinantes da Variação da Pobreza nos Estados Brasileiros no Período 2001 a 2012

    Directory of Open Access Journals (Sweden)

    Janaina Cabral da Silva

    2015-12-01

    Full Text Available Resumo: Fundamentando-se nas teorias que procuram relacionar pobreza, desigualdade, crescimento econômico e bem-estar, o objetivo central deste estudo é decompor a variação da pobreza, baseando-se nos seguintes fatores: efeito tendência, efeito crescimento, efeito desigualdade e efeito residual em relação aos estados brasileiros, entre 2001 e 2012. Para tanto, parte-se da estimação de um modelo estatístico com dados em painel, com utilização das seguintes variáveis: pobreza, renda familiar per capita e o índice de Gini, extraídas da PNAD. Em relação ao modelo adotado, é válido destacar que o efeito tendência é uma distinção, uma vez que não foi ainda utilizada em decomposições para área rural, mas apenas para zona urbana. Quanto ao aspecto relativo à redução de pobreza, os resultados encontrados indicam que, na maior parte dos estados, o efeito crescimento se sobressaiu em relação aos demais no período analisado. Não obstante, o efeito distribuição também teve sua importância nesse processo, seguido do efeito tendência. Porém, o efeito residual foi de pouca relevância.

  2. Variação sazonal dos valores de bioquímica sérica de jiboias amazônicas (Boa constrictor constrictor mantidas em cativeiro

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    Dennis José da Silva Lima

    2012-09-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2012v25n4p165   Na região Norte do Brasil, as estações do ano não são bem definidas como acontece nas regiões Sul e Sudeste, devido ao clima equatorial quente e úmido, com um período mais chuvoso, conhecido como inverno amazônico, e um período menos chuvoso, conhecido como verão amazônico. Com esta pesquisa, objetivou-se avaliar a variação dos valores bioquímicos séricos de jiboias amazônicas correlacionadas com a sazonalidade da região. Foram realizadas análises bioquímicas séricas (AST, ALT, DHL, FA, cálcio, ácido úrico, fósforo, proteína total, albumina e globulina de 31 serpentes da espécie Boa constrictor constrictor, mantidas em cativeiro. Levando em consideração a variável sazonalidade, observou-se que oito dos dez parâmetros são maiores no inverno em comparação ao verão (proteína total, albumina, globulina, ALT, AST, FA, DHL e cálcio sendo que os valores de ALT, AST e cálcio mostraram ter diferenças estatísticas significantes no verão e inverno amazônicos, enquanto que os demais parâmetros parecem não ser influenciados pela sazonalidade. Esta foi a primeira pesquisa, em cativeiro, analisando o perfil bioquímico sérico serpentes Boa constrictor constrictor no Estado do Pará.

  3. Influência da variação da velocidade de rotação e do tipo de cimento nas propriedades de argamassas de revestimento nos estados fresco e endurecido

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    D. R. Torres

    Full Text Available Resumo A etapa de mistura influencia as condições de execução do revestimento de argamassa, visto que desde o primeiro contato dos materiais sólidos com água uma série de eventos de aglomeração e desaglomeração no sistema é verificada. Acontece que durante o processamento das argamassas em obra a utilização de equipamentos com distintos mecanismos de mistura pode modificar o desempenho do sistema de revestimento. Este trabalho foi realizado com o objetivo de avaliar a influência da condição de mistura durante o processamento de argamassas aditivadas com incorporador de ar e formuladas com diferentes tipos de cimento. As misturas foram realizadas em um reômetro rotacional variando-se a velocidade de rotação, porém mantendo-se o tempo total de batimento. Reometria de mistura, ciclo de cisalhamento e teor de ar incorporado foram as propriedades avaliadas no estado fresco, enquanto porosidade, resistência mecânica, módulo de elasticidade e permeabilidade ao ar foram utilizados para avaliação do estado endurecido. Com base nos resultados obtidos pôde-se afirmar que a variação da velocidade de rotação e o tipo de cimento utilizado impactaram as propriedades das composições nos estados fresco e endurecido.

  4. Presence in the IP Multimedia Subsystem

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    Ling Lin

    2007-01-01

    Full Text Available With an ever increasing penetration of Internet Protocol (IP technologies, the wireless industry is evolving the mobile core network towards all-IP network. The IP Multimedia Subsystem (IMS is a standardised Next Generation Network (NGN architectural framework defined by the 3rd Generation Partnership Project (3GPP to bridge the gap between circuit-switched and packet-switched networks and consolidate both sides into on single all-IP network for all services. In this paper, we provide an insight into the limitation of the presence service, one of the fundamental building blocks of the IMS. Our prototype-based study is unique of its kind and helps identifying the factors which limit the scalability of the current version of the presence service (3GPP TS 23.141 version 7.2.0 Release 7 [1], which will in turn dramatically limit the performance of advanced IMS services. We argue that the client-server paradigm behind the current IMS architecture does not suite the requirements of the IMS system, which defies the very purpose of its introduction. We finally elaborate on possible avenues for addressing this problem.

  5. Email and Epistolary technologies: Presence, Intimacy, Disembodiment

    Directory of Open Access Journals (Sweden)

    Esther Milne

    2003-01-01

    Full Text Available A key problem for critical media practice is how to assess accurately the technological impact, historical significance and cultural consequences of a particular change in a communications system. Contemporary theorising about the impact of electronic, digitally networked culture is often articulated within an eschatological narrative of apocalypse and last things. The old is cast as naive and redundant while the new appears triumphant, conquering and redemptive. Washing away the sins of the old, the new technology arrives, it seems, out of nowhere. In response to such socio-technological representations, this paper argues that the dialectic between old and new communication systems is more complex than has been assumed by contemporary media theory. Rather than a narrative of radical changes, decisive shifts and abrupt breaks, the relation between epistolary and email technology reveals certain continuities. Specifically, tropes of presence and intimacy are traced through three media sites: a "virtual community" of British nineteenth-century letter writers, the postcard correspondence of an Australian First World War soldier and a twenty first century email discussion list. Mapping these sites reveals a central paradox of technological and discursive cultural practice, namely, that material signifiers can be used to produce incorporeal presence.

  6. On estimating probability of presence from use-availability or presence-background data.

    Science.gov (United States)

    Phillips, Steven J; Elith, Jane

    2013-06-01

    A fundamental ecological modeling task is to estimate the probability that a species is present in (or uses) a site, conditional on environmental variables. For many species, available data consist of "presence" data (locations where the species [or evidence of it] has been observed), together with "background" data, a random sample of available environmental conditions. Recently published papers disagree on whether probability of presence is identifiable from such presence-background data alone. This paper aims to resolve the disagreement, demonstrating that additional information is required. We defined seven simulated species representing various simple shapes of response to environmental variables (constant, linear, convex, unimodal, S-shaped) and ran five logistic model-fitting methods using 1000 presence samples and 10 000 background samples; the simulations were repeated 100 times. The experiment revealed a stark contrast between two groups of methods: those based on a strong assumption that species' true probability of presence exactly matches a given parametric form had highly variable predictions and much larger RMS error than methods that take population prevalence (the fraction of sites in which the species is present) as an additional parameter. For six species, the former group grossly under- or overestimated probability of presence. The cause was not model structure or choice of link function, because all methods were logistic with linear and, where necessary, quadratic terms. Rather, the experiment demonstrates that an estimate of prevalence is not just helpful, but is necessary (except in special cases) for identifying probability of presence. We therefore advise against use of methods that rely on the strong assumption, due to Lele and Keim (recently advocated by Royle et al.) and Lancaster and Imbens. The methods are fragile, and their strong assumption is unlikely to be true in practice. We emphasize, however, that we are not arguing against

  7. Acoustic levitation in the presence of gravity

    Science.gov (United States)

    Collas, P.; Barmatz, M.; Shipley, C.

    1989-01-01

    The method of Gor'kov (1961) has been applied to derive general expressions for the total potential and force on a small spherical object in a resonant chamber in the presence of both acoustic and gravitational force fields. The levitation position is also determined in rectangular resonators for the simultaneous excitation of up to three acoustic modes, and the results are applied to the triple-axis acoustic levitator. The analysis is applied to rectangular, spherical, and cylindrical single-mode levitators that are arbitrarily oriented relative to the gravitational force field. Criteria are determined for isotropic force fields in rectangular and cylindrical resonators. It is demonstrated that an object will be situated within a volume of possible levitation positions at a point determined by the relative strength of the acoustic and gravitational fields and the orientation of the chamber relative to gravity.

  8. Hidden symmetry in the presence of fluxes

    International Nuclear Information System (INIS)

    Kubiznak, David; Warnick, Claude M.; Krtous, Pavel

    2011-01-01

    We derive the most general first-order symmetry operator for the Dirac equation coupled to arbitrary fluxes. Such an operator is given in terms of an inhomogeneous form ω which is a solution to a coupled system of first-order partial differential equations which we call the generalized conformal Killing-Yano system. Except trivial fluxes, solutions of this system are subject to additional constraints. We discuss various special cases of physical interest. In particular, we demonstrate that in the case of a Dirac operator coupled to the skew symmetric torsion and U(1) field, the system of generalized conformal Killing-Yano equations decouples into the homogeneous conformal Killing-Yano equations with torsion introduced in D. Kubiznak et al. (2009) and the symmetry operator is essentially the one derived in T. Houri et al. (2010) . We also discuss the Dirac field coupled to a scalar potential and in the presence of 5-form and 7-form fluxes.

  9. Measuring Variability in the Presence of Noise

    Science.gov (United States)

    Welsh, W. F.

    Quantitative measurements of a variable signal in the presence of noise requires very careful attention to subtle affects which can easily bias the measurements. This is not limited to the low-count rate regime, nor is the bias error necessarily small. In this talk I will mention some of the dangers in applying standard techniques which are appropriate for high signal to noise data but fail in the cases where the S/N is low. I will discuss methods for correcting the bias in the these cases, both for periodic and non-periodic variability, and will introduce the concept of the ``filtered de-biased RMS''. I will also illustrate some common abuses of power spectrum interpretation. All of these points will be illustrated with examples from recent work on CV and AGN variability.

  10. Species composition and diel variation of a butterfly taxocene (Lepidoptera, Papilionoidea and Hesperioidea in a restinga forest at Itapuã State Park, Rio Grande do Sul, Brazil Composição e variação ao longo do dia na taxocenose de borboletas (Lepidoptera, Papilionoidea e Hesperioidea em uma mata de restinga no Parque Estadual de Itapuã, Rio Grande do Sul, Brasil

    Directory of Open Access Journals (Sweden)

    Maria O. Marchiori

    2006-06-01

    Full Text Available The composition and the hourly variation of butterfly species (Lepidoptera: Papilionoidea and Hesperioidea throughout the day and the seasons was evaluated in a 1,000 m² patch of sandy forest (Restinga forest on a coastal plain at Itapuã State Park (30º22'S, 51º02'W, Viamão, Rio Grande do Sul, from July 2001 to June 2002. Butterflies were sampled by scanning and focal observations (adapted from ALTMANN 1974 carried out at successive 45 minutes intervals. This methodology proved to be effective in recording the presence and activity of butterflies on a small area. A total of 108 observation hours yielded 326 butterflies from 41 species, 33 genera and five families. Nymphalidae was the most abundant family contributing with 74% of the total individuals. The most abundant species was Eunica eburnea Fruhstorfer, 1907 (Nymphalidae with 45 individuals registered along the year. General diversity estimates were Dmg = 6.912, H' = 3.012 and d = 0.138. Although there were variations in the daily times of butterfly activity throughout the seasons, there was a general trend for higher activity during the morning period, between 9:00 and 11:45 h.A composição e a variação das espécies de borboletas (Lepidoptera, Papilionoidea e Hesperioidea ao longo dos diferentes horários do dia e das estações do ano foi avaliada em uma mancha de 1.000 m² de mata de restinga localizada na planície arenosa do Parque Estadual de Itapuã (30º22'S 51º02'W, Viamão, Rio Grande do Sul, de julho 2001 a junho 2002. As borboletas foram amostradas através de observações de varredura e focal (adaptadas de ALTMANN 1974 a intervalos sucessivos de 45 minutos cada. Esta metodologia demonstrou-se eficaz no registro da presença e atividade das borboletas em uma área de tamanho reduzido. Um total de 108 horas de observação resultou em 326 borboletas distribuídas em 41 espécies, 33 gêneros e cinco famílias. Nymphalidae foi a família mais abundante contribuindo com

  11. Geographic distribution and morphological variation in Mimon bennettii (Chiroptera, Phyllostomidae Distribuição geográfica e variação morfológica em Mimon bennettii (Chiroptera, Phyllostomidae

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    Renato Gregorin

    2008-09-01

    Full Text Available We studied discrete and quantitative data from 88 specimens of the subgenus Mimon previously identified as Mimon bennettii (Gray, 1838 and M. cozumelae Goldman, 1914 from diverse parts of their range. Our data indicate that specimens of Mimon bennetii in Brazil presented geographic variation in morphometrical characters and mosaic variation in qualitative traits. Specimens from the Cerrado biome collected in Brazilian states like Piaui, Tocantins, and Goiás have longer forearms than those distributed in the Atlantic and Amazon forested domains. Based on morphometrics, as showed by t-tests, specimens of M. bennettii from the Brazilian Cerrado resemble phenetically more with M. cozumelae than the M. bennettii from Atlantic Forest. Characters presently used to diagnosis M. cozumelae also were also recorded to M. bennettii in diverse parts of Brazil, making that validity of M. cozumelae questionable based on this kind of traits. This research also updated the geographic distribution to the M. bennettii in Brazil.Foi analisada a morfologia quantitativa e qualitativa de 88 espécimes do subgênero Mimon previamente identificados como Mimon bennettii (Gray, 1838 e M. cozumelae Goldman, 1914 de diversas localidades dentro de sua distribuição. Os dados indicam que os espécimes de Mimon bennetii no Brasil apresentam variação geográfica nos caracteres morfométricos e em mosaico nos qualitativos. Espécimes do bioma Cerrado provenientes dos estados brasileiros do Piauí, Tocantins e Goiás têm antebraço mais longo que os indivíduos dos domínios da Amazônia e Floresta Atlântica. Com base na morfometria aplicando teste t-Student, os espécimes de M. bennettii do Cerrado lembram fenéticamente mais M. cozumelae que M. bennettii da Floresta Atlântica. Os caracteres morfológicos atualmente empregados para diagnosticar M. cozumelae também foram registrados para M. bennettii em diversas áreas do Brasil, tornando a validade de M. cozumelae

  12. Comportamento da laranjeira Piralima sobre Poncirus trifoliata com variações na altura de enxertia Behaviour of Piralima orange on Poncirus trifoliata rootstock as a function of budding height

    Directory of Open Access Journals (Sweden)

    V.R. Sampaio

    1994-04-01

    Full Text Available Pesquisou-se a combinação de laranjeira Piralima, Citrus sinensis (L. Osb. sobre Poncirus trifoliata (L. Raf. fazendo-se variações nas alturas das enxertias, com operações efetuadas a zero, dez, vinte e quarenta centímetros de altura. Avaliações realizadas após seis anos e meio de implantação do experimento permitiram as seguintes conclusões: 1 as alturas das enxertias afetaram o desenvolvimento global das plantas, com as enxertias mais altas reforçando o efeito ananicante do Poncirus trifoliata; 2 as diferentes alturas de enxertia não afetaram as produções de frutos das três primeiras produções comerciais. Na quarta colheita surgiu diferença entre os tratamentos extremos, com maiores produções acontecendo para plantas enxertadas próximas ao solo; 3 o Poncirus trifoliata induziu características ananicantes às copas e as constantes boas produções de frutos de bom tamanho. Mostrou-se ser porta-enxerto interessante para o cultivar Piralima.The combination Poncirus trifoliata x Piralima acidless orange was studied as a function of the budding height, from zero to forty centimeters. After six and half years of evaluations the results led to the following conclusions: 1 variation in the budding height affected the plant global development: the higher was the budding height, the more intense was the Poncirus trifoliata dwarf effect. 2 variation in budding height did not affect orange yield during the first three commercial harvests. Difference occurred in the fourth harvest, between the extreme treatments, with larger yields for plants budded near to the soil. 3 Poncirus trifoliata induced dwarf characteristics to 'Piralima' stock as well as regular and good yield along the years, and the fruits were classified as high grade. Poncirus trifoliata showed to be an interesting rootstock for the cultivar Piralima.

  13. Variação sazonal no recrutamento de Phragmatopoma caudata (Polychaeta, Sabellariidae na costa sudeste do Brasil: biometria e validação de metodologia para categorização de classes etárias

    Directory of Open Access Journals (Sweden)

    Larisse Faroni-Perez

    2014-03-01

    Full Text Available Este estudo explora a maturação de gametas e biometria de Phragmatopoma caudata Krøyer in Mörch, 1863 para endossar uma metodologia e oferecer uma técnica adequada para estudos que objetivam avaliar a ecologia populacional. A análise de correlação de Pearson confirmou a relação positiva (r = 0,90, P <0,0001 entre o comprimento do corpo e o comprimento da coroa opercular. Indivíduos com opercular crown < 0,9 mm podem ser considerados como juvenil devido à ausência de gametas. Portanto, utilizando-se o método aprovado para separar as classes de tamanho, a população dos recifes de P. caudata no Parque Estadual Xixová-Japuí (PEJX na Baía de Santos, Estado de São Paulo, foi examinada durante dois anos, com o objetivo de analisar a densidade populacional e o padrão sazonal da classe juvenil. Em período de elevadas taxas de juvenis, a densidade populacional atingiu 128.115 ind./m², porém, a média foi 65.090±22.033 ind./m². As análises estatísticas (Kruskal-Wallis H = 18,475, p < 0,01 revelaram existir variação significativa na composição juvenil entre as estações chuvosa e seca. Apesar da presença de juvenis em meses de seca, as estações chuvosas contemplaram 92,1% dos juvenis amostrados. O padrão de juvenis observado pode estar relacionado com fatores biológicos (e.g. gametogênese e ciclo de vida e abióticos (e.g. suprimento alimentar e correntes marinhas. Estes resultados destacam a necessidade de programas de monitoramento de longo prazo que integrem elementos ecológicos e abióticos, a fim de obter uma compreensão mais completa da ecologia desse poliqueta e ajudar a gerenciar a biodiversidade marinha do PEJX.

  14. Correção de textos e concepções de língua e variação: relações nem sempre aparentes

    Directory of Open Access Journals (Sweden)

    Maria Auxiliadora Bezerra

    2004-01-01

    Full Text Available Os objetivos deste trabalho são identificar conceitos de língua e de variação lingüística subjacentes à correção de textos escolares realizada por professores de língua materna e explicitar a relação entre esses conceitos e a correção/avaliação feita. Para isso, foram analisadas duas redações corrigidas e avaliadas por um grupo de professores em formação continuada, tendo-lhe sido solicitada a justificativa para a nota a elas atribuída. A análise foi baseada em princípios teóricos relativos à formação de professor, correção/avaliação e concepções de linguagem. Os resultados indicam que os professores corrigem, sobretudo, seguindo normas do código, embora ao justificarem suas notas lancem mão de informações discursivo-textuais, demonstrando terem se apropriado de um discurso teórico moderno sobreposto a práticas tradicionais.This paper has two main aims to be achieved. The first one relates to identifying concepts of language and linguistic variety subjacent to school texts correction led by teachers of mother tongue, whereas the second one concerns the elicitation of the relation between those concepts and the correction/evaluation practices adopted by the teachers. For that, two compositions were corrected and evaluated by a group of teachers to be. Afterwards, they were required to justify the grades given. The analysis was based on theoretical principles in relation to teacher training, correction/evaluation practices, and language concepts as well. The results show that although teachers correct compositions based mainly on code rules, during the grades justification phase they refer to discursive information. This implies that despite the fact that they have acquired a modern theoretical discourse, they still adopt traditional corretive practices.

  15. Variação da evapotranspiração de referência calculada em diferentes intervalos de tempo Variation of the reference evapotranspiration calculated for different times interval

    Directory of Open Access Journals (Sweden)

    Álvaro J. Back

    2007-04-01

    Full Text Available Valores de evapotranspiração de referência foram calculados em intervalos de um, cinco, dez, quinze dias e mensal. Foram utilizados dados meteorológicos da Estação Meteorológica de Urussanga - SC (latitude 28°31'S, longitude 49°19'W referentes ao período de 1981 a 2004. A evapotranspiração de referência foi calculada pelo método de Penman-Monteith com base nas médias das variáveis meteorológicas dos diferentes períodos estudados. Observou-se que não houve diferenças significativas nas médias de evapotranspiração calculadas nos diversos intervalos de tempo. No entanto, houve diferenças significativas na dispersão dos valores em torno da média. Para valores diários, foi obtido coeficiente de variação (C.V. entre 30 e 40%, e para valores mensais, variou entre 6% e 12%. Observou-se, também, que os dados de evapotranspiração se ajustaram à distribuição Beta, e assim foram estimados, para cada mês, os valores de evapotranspiração de referência com probabilidades de 5; 10; 25; 50; 75; 90 e 95%.Reference evapotranspiration values were calculated for time interval of one, five, ten, fifteen days and monthly. Meteorological series data from 1981 to 2004 from Urussanga Weather Station (latitude 28°31'S, longitude 49°19'W were used to calculate reference evapotranspiration with Penman-Monteith method with mean of meteorological variables for every time intervals. No difference was observed in average reference evapotranspiration computed in all time steps. However, some difference in variations of data around the average was observed. For daily value, the variation coefficient varies from 30 to 40% and for monthly values de coefficient variation varied from 6 to 12%. It was observed that the reference evapotranspirations adjusted very well to Beta distribution probability, and the reference evapotranspiration with probability of 5; 10; 25; 50; 75; 90 e 95% was estimated.

  16. Leishmaniose tegumentar americana na Ilha Grande, Rio de Janeiro: VI. observações sobre a freqüência horária e variação mensal dos transmissores

    Directory of Open Access Journals (Sweden)

    Nelson A. de Araújo Filho

    1981-12-01

    Full Text Available Para estudo da freqüência horária dos principais vetores da Leishmaniose Tegumentar Americana (LTA, na Ilha Grande, durante os anos de 1976 a 1977, foram realizadas 4 capturas de 24 horas com isca animal (cão, ao ar livre, e 5 capturas de 24 horas em um único domicilio da área. Observou-se que a espécie Lutzomyia intermedia ocorreu durante todo o período noturno, com densidade constante no domicílio humano, enquanto a espécie Lutzomyia migonei apresentou maiores densidades no período da madrugada, nas capturas com isca animal (cão. Em 156 horas de estudo sobre variação mensal, durante o período de março de 1976 a fevereiro de 1977, a espécie L. intermedia ocorreu durante todo o ano, sendo abril, maio, outubro e dezembro os meses de maior densidade; a espécie L. migonei apresentou-se com baixa densidade, chegando a desaparecer no mês de setembro. As elevadas densidades das espécies L. intermedia e L. migonei indicam-nas como as prováveis vetoras de LTA na Ilha Grande.For the study of time frequency of the principal vectors of the Mucocutaneous Leishmaniasis in the Ilha Grande (Great Island, from 1976 to 1977 we made four catches in 24 hours with animal bait (dog in the outdoors and five catches in just one house of the area. It was found that the species Lutzomyia intermedia occurred during the whole night a steady density in human dwellings, while the species Lutzomyia migonei presented greater density at dawn, in catches with animal bait (dog. in a 156 hours' study on monthly variation, from March 1976 to February 1977, a specie Lutzomyia intermedia appeared during the whole year, the months of April, May, October and December being those of greater density while the specie Lutzomyia migonei had a low density even disappearing in September. The high densities of the species Lutzomyia intermedia and Lutzomyia migonei indica te them as the probable vectors of the mucocutaneous leishmaniasis in Ilha Grande.

  17. The Presence of Backpacking Tourism in Europe

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    Vukica Majstorović

    2013-10-01

    Full Text Available Global tourism is characterized by constant change. New forms of tourism and various types of tourist movements are emerging, while the number of tourists is constantly increasing and now it surpasses one billion. What considerably contributes to the increase in tourist traffic is low-budget travel. Backpacking is such form of travel. It is mostly present among young population that wants to travel in order to experience authentic adventures and learn about the local culture, far from typical tourist paths. Backpackers aim to see as much as possible for small amounts of money. The process of globalization has contributed to the fact that the phenomenon of backpacking is present all around the globe. In order to determine the presence of backpacking in Europe and some important characteristics of this type of travel there has been conducted a survey via the Internet. The results showed that young Europeans are informed of this way of tourist movements and they make the majority of the participants in backpacking tourism. In the years to come the number of people in the world involved in these types of journeys will grow, which will lead to the need for a more detailed analysis of backpacking worldwide.

  18. Spacetime thermodynamics in the presence of torsion

    Science.gov (United States)

    Dey, Ramit; Liberati, Stefano; Pranzetti, Daniele

    2017-12-01

    It was shown by Jacobson in 1995 that the Einstein equation can be derived as a local constitutive equation for an equilibrium spacetime thermodynamics. With the aim to understand if such thermodynamical description is an intrinsic property of gravitation, many attempts have been made so far to generalize this treatment to a broader class of gravitational theories. Here we consider the case of the Einstein-Cartan theory as a prototype of theories with nonpropagating torsion. In doing so, we study the properties of Killing horizons in the presence of torsion, establish the notion of local causal horizon in Riemann-Cartan spacetimes, and derive the generalized Raychaudhuri equation for these kinds of geometries. Then, starting with the entropy that can be associated to these local causal horizons, we derive the Einstein-Cartan equation by implementing the Clausius equation. We outline two ways of proceeding with the derivation depending on whether we take torsion as a geometric field or as a matter field. In both cases we need to add internal entropy production terms to the Clausius equation as the shear and twist cannot be taken to be 0 a priori for our setup. This fact implies the necessity of a nonequilibrium thermodynamics treatment for the local causal horizon. Furthermore, it implies that a nonzero twist at the horizon in general contributes to the Hartle-Hawking tidal heating for black holes with possible implications for future observations.

  19. Quality Assurance in the Presence of Variability

    Science.gov (United States)

    Lauenroth, Kim; Metzger, Andreas; Pohl, Klaus

    Software Product Line Engineering (SPLE) is a reuse-driven development paradigm that has been applied successfully in information system engineering and other domains. Quality assurance of the reusable artifacts of the product line (e.g. requirements, design, and code artifacts) is essential for successful product line engineering. As those artifacts are reused in several products, a defect in a reusable artifact can affect several products of the product line. A central challenge for quality assurance in product line engineering is how to consider product line variability. Since the reusable artifacts contain variability, quality assurance techniques from single-system engineering cannot directly be applied to those artifacts. Therefore, different strategies and techniques have been developed for quality assurance in the presence of variability. In this chapter, we describe those strategies and discuss in more detail one of those strategies, the so called comprehensive strategy. The comprehensive strategy aims at checking the quality of all possible products of the product line and thus offers the highest benefits, since it is able to uncover defects in all possible products of the product line. However, the central challenge for applying the comprehensive strategy is the complexity that results from the product line variability and the large number of potential products of a product line. In this chapter, we present one concrete technique that we have developed to implement the comprehensive strategy that addresses this challenge. The technique is based on model checking technology and allows for a comprehensive verification of domain artifacts against temporal logic properties.

  20. Methane oxidation in presence of sulfur dioxide

    International Nuclear Information System (INIS)

    Mantashyan, A.A.; Avetisyan, A.M.; Makaryan, E.M.; Wang, H.

    2006-01-01

    The emission of sulfurous gases including SO 2 from stationary power generation remains to be a serious environmental and ecological problem. Sulfurous gases are almost entirely produced from the combustion of sulfur-containing fuels. While fuel desulfurization and flue gas scrubbing is a viable solution, in the developing countries it remains to be an economical challenge to implement these SO x reduction technologies. The oxidation of methane in presence of sulfurous gas (SO 2 ) addition was studied experimentally. Te experiments were conducted in a static reactor at temperature of 728-786 K, and for mixture of C 4 /O 2 ≡ 1/2 at a pressure of 117 Torr with varying amount of SO 2 addition. It was observed that SO 2 addition accelerated the oxidation process, reduced the induction period and increased the extent of methane consumption. At the relatively short resident time (less than 50 sec) SO 3 was detected, but at longer residence time SO 3 was reduced spontaneously to SO 2

  1. Casimir effect in the presence of metamaterials

    Energy Technology Data Exchange (ETDEWEB)

    Kort-Kamp, W.J.M.; Pinheiro, F.A.; Maia Neto, P.A.; Farina, C. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil); Rosa, F.S.S. [Universite Paris-Sud (France). Lab. Charles Fabry

    2011-07-01

    Full text: The Casimir effect was theoretically predicted in 1948 by H. G. B. Casimir. In its original form, it is the attraction between two parallel plates made of perfectly conductors in vacuum. The novelty in the Casimir result was the method used and not the fact that two neutral bodies attract each other, since the force between two neutral, but polarizable, atoms was previously treated by London in 1930. Casimir demonstrated that the force between the plates could be calculated from the variation in the zero-point energy of the quantized electromagnetic field caused by the presence of the plates. Nowadays there is no doubt about the existence of this effect, which has been observed in the last decade in experiments of great precision. Casimir forces play an important role in nanotechnology, in particular in the study of micro- and nano-electromechanical systems, because these forces become dominant in the nanoscopic scale. Casimir forces are responsible for an attraction of individual parts of these devices, making them eventually to stick together. As a result, attractive Casimir forces constitute a nuisance for practical applications. Therefore the investigation of a repulsive Casimir force is of great current interest. It has been recently argued that Casimir repulsion could be obtained by an adequate choice of artificial materials, the so-called metamaterials, with engineered electromagnetic properties [R. Zhao et al, PRL 103, 103602 (2009)]. In this work we investigate the interaction between an atom and a chiral metamaterial plate. Using realistic parameters, obtained from recent experiments and computer simulations, we show that state-of-the-art chiral metamaterials are not able generate Casimir repulsive forces. We also investigate the possibility of magneto-optical metamaterials to exhibit a repulsive Casimir force. To accomplish this, we discuss the dispersive interaction between a magneto-optical sphere and a chiral surface or a magneto

  2. Presence of metabolic syndrome in football linemen.

    Science.gov (United States)

    Buell, Jackie L; Calland, Doug; Hanks, Fiona; Johnston, Bruce; Pester, Benjamin; Sweeney, Robert; Thorne, Robert

    2008-01-01

    Metabolic syndrome is a clustering of symptoms associated with abdominal obesity that demonstrates a high risk for cardiovascular disease and type II diabetes mellitus. To evaluate football linemen in National Collegiate Athletic Association Divisions I, II, and III schools for the presence of metabolic syndrome according to the American Heart Association/National Heart, Lung, and Blood Institute criteria as well as to document other related biomarkers. Cross-sectional descriptive study. Three university locations on the first full day of football camp in early morning. Of 76 football linemen, 70 were able to provide blood samples. Height, mass, blood pressure, upper-body skinfolds, and waist circumference were measured at various stations. Two small venous samples of blood were collected and analyzed in a hospital laboratory for fasting insulin, glucose, high-density lipoprotein, total cholesterol, triglycerides, C-reactive protein, and glycosylated hemoglobin. The last station was a verbal family history for cardiovascular disease and diabetes; also, athletes filled out a nutrition attitudes questionnaire. Of the 70 athletes, 34 were identified as having metabolic syndrome according to measures of blood pressure, waist circumference, fasting glucose, high-density lipoprotein, and triglycerides. The mean total cholesterol-to-high-density lipoprotein cholesterol ratio for the group was 4.95, with 32 participants displaying values higher than 5.0. Twelve volunteers had total cholesterol levels greater than 200 mmol/L, 15 had high levels of C-reactive protein, and 9 had slightly elevated levels of glycosylated hemoglobin. Although athletes might be assumed to be protected from risks of cardiovascular disease, we found a high incidence of metabolic syndrome and other associated adverse biomarkers for heart disease in collegiate football linemen. Early screening, awareness, and intervention may have favorable effects on the overall health outcomes of football linemen.

  3. Local-scale spatial variation in diversity of social wasps in an Amazonian rain forest in Caxiuanã, Pará, Brazil (Hymenoptera, Vespidae, Polistinae Variação na diversidade de vespas sociais em escala local numa floresta pluvial amazônica em Caxiuanã, Pará, Brasil (Hymenoptera, Vespidae, Polistinae

    Directory of Open Access Journals (Sweden)

    Orlando Tobias Silveira

    2012-09-01

    Full Text Available Polistine wasps are important in Neotropical ecosystems due to their ubiquity and diversity. Inventories have not adequately considered spatial attributes of collected specimens. Spatial data on biodiversity are important for study and mitigation of anthropogenic impacts over natural ecosystems and for protecting species. We described and analyzed local-scale spatial patterns of collecting records of wasp species, as well as spatial variation of diversity descriptors in a 2500-hectare area of an Amazon forest in Brazil. Rare species comprised the largest fraction of the fauna. Close range spatial effects were detected for most of the more common species, with clustering of presence-data at short distances. Larger spatial lag effects could also be identified in some species, constituting probably cases of exogenous autocorrelation and candidates for explanations based on environmental factors. In a few cases, significant or near significant correlations were found between five species (of Agelaia, Angiopolybia, and Mischocyttarus and three studied environmental variables: distance to nearest stream, terrain altitude, and the type of forest canopy. However, association between these factors and biodiversity variables were generally low. When used as predictors of polistine richness in a linear multiple regression, only the coefficient for the forest canopy variable resulted significant. Some level of prediction of wasp diversity variables can be attained based on environmental variables, especially vegetation structure. Large-scale landscape and regional studies should be scheduled to address this issue.Vespas sociais são importantes nos ecossistemas neotropicais pela abundância e diversidade. A maioria dos inventários recentes não têm dedicado atenção aos atributos espaciais dos espécimes coletados. Dados espaciais são importantes para estudar e mitigar impactos sobre ecossistemas naturais e proteger espécies. Este artigo descreve e

  4. Variação anual dos débitos expiratórios em trabalhadores da indústria têxtil. Relação com a exposição a endotoxinas bacterianas

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    J. Torres da Costa

    1998-05-01

    Full Text Available RESUMO: Os trabalhadores da industría textil estāo expostos. puluentes ocupacionais que frequentemente são causa de doençã respiratória. Entre as patologias descritas, a bissinose, a tosse crónica e a asma são as mais comuns. parecendo a sua lncidência depender dos nivels de empoeiramento e endotoxinas a que os trabalhadores estão expostos.Neste estudo foi nosso objectivo avaliar a relação entre as caracteristicas do local de trabalho (empoeiramento e endotoxinas com a variaçã do VEMS, anual e ao longo do turno de trabalho, e a hiperreactrividade brônquica inespecifica (HRB.Assim, avaliámos 417 trabalhadores têxteis, 231 (fiação e 186 (tecelagem. Os trabalhadores da fiação estavam expostos a 0,68 mg/m3 de empoeiramento, e 14.2 ng/m3 de endotoxinas. Na tecelagem os trabalhadores estavam expostos a um empoeiramento de 0,42 mg/m3 não se tendo encontrado niveis mensuráveis de endotoxinas. Para os trabalhadores da fiação, os níveis de endotoxinal estavam relacionados com a HRB (r=0,32 p0001. The endotoxine levels were also superior among the workers who presented FEV1 variations through the shift≥5% or>200 ml (25.6±19.4 ng/m3 /6.8+0.7 ng/m3 p<0,0001. Dust levels were not related with BHR nor to the variation of FEVI during the shift.The annual FEV1 variation was studied for 3 years (D-FEV1 year, was higher in the spinning workers (-50.2±34 ml/-32.0±12 ml p<0.00001, and was related to endotoxine levels (r=0.48 p<0.001 and with BHR (r=-0.72 p<0.001. There was no relation with dust level. The workers who presented a positive FEV1 variation during the shift, also presented a higher D-FEV1 year, (-75.5±32.7 ml/-34.3±25.1 ml p<0.001.Among the spinning workers, 28.2% have respiratory symptoms. Byssinose was found in 7.7% and asthma in 13.4%, and among them the asthmatics have higher BHR (5.7±7.3 mg/ml/10.5±7.3 mg/ml p<0

  5. A Low-Cost Tele-Presence Wheelchair System

    OpenAIRE

    Shen, Jiajun; Xu, Bin; Pei, Mingtao; Jia, Yunde

    2016-01-01

    This paper presents the architecture and implementation of a tele-presence wheelchair system based on tele-presence robot, intelligent wheelchair, and touch screen technologies. The tele-presence wheelchair system consists of a commercial electric wheelchair, an add-on tele-presence interaction module, and a touchable live video image based user interface (called TIUI). The tele-presence interaction module is used to provide video-chatting for an elderly or disabled person with the family mem...

  6. A Team of Instructors' Use of Social Presence, Teaching Presence, and Attitudinal Dissonance Strategies: An Animal Behaviour and Welfare MOOC

    Science.gov (United States)

    Watson, Sunnie Lee; Watson, William R.; Janakiraman, Shamila; Richardson, Jennifer

    2017-01-01

    This case study examined a team of instructors' use of social presence, teaching presence, and attitudinal dissonance in a Massive Online Open Course (MOOC) on Animal Behaviour and Welfare (ABW), designed to facilitate attitudinal learning. The study reviewed a team of six instructors' use of social presence and teaching presence by applying the…

  7. Demography of Northern Spotted Owls in southwestern Oregon

    Science.gov (United States)

    Zabel, Cynthia J.; Salmons, Susan E.; Forsman, Eric D.; DeStefano, Stephen; Raphael, Martin G.; Gutierrez, R.J.

    1996-01-01

    Northern Spotted Owls (Strix occidentalis caurina) are associated with lower elevation, commercially valuable, late-successional coniferous forests in the Pacific Northwest. Meta-analyses of demographic parameters indicate that Northern Spotted Owl populations are declining throughout their range (Anderson and Burnham 1992, Burnham et al. this volume). Recent research has attempted to determine whether management activities have affected the viability of Spotted Owl populations, and results have led to development of conservation plans for the species (Dawson et al. 1987, Thomas et al. 1990, Murphy and Noon 1992, USDI 1992, Thomas et al. 1993b).In the Recovery Plan for the Northern Spotted Owl (USDI 1992b) threats to the species were identified as small population sizes, declining populations, limited amounts of habitat, continued loss and fragmentation of habitat, geographically isolated populations, and predation and competition from other avian species. Weather and fire are natural processes that also may affect reproductive success of Spotted Owls. Weather may be a factor in the high annual variability in fecundity of Spotted Owls, as has been suggested for other predatory bird species (Newton, 1979, 1986). However, these factors have not been addressed in previous studies of Spotted Owls.Our objectives were to estimate survival, fecundity, and annual rates of population change (l) for resident, territorial female Spotted Owls at two study areas in the coastal mountains of southwestern Oregon. We tested if the amount of rainfall was correlated with reproduction of Spotted Owls. While surveying for Spotted Owls, we documented the increased presence of Barred Owls (Strix varia), a potential competitor of Spotted Owls.

  8. Variações nos níveis de adiponectina nos pacientes com doença renal crônica: um estudo prospectivo de 12 meses

    Directory of Open Access Journals (Sweden)

    Maria Ayako Kamimura

    2012-09-01

    adiponectina (β = -0,04; p = 0,025; R² = 0,21. CONCLUSÃO: A idade, o sexo, a função renal e a gordura visceral estiveram independentemente associados com os níveis de adiponectina nos pacientes com DRC na fase não dialítica. No entanto, a mudança da gordura visceral foi o único preditor das variações nos níveis de adiponectina ao longo de 12 meses.

  9. Variações diárias nas excreções de creatinina e derivados de purinas em novilhas Daily variation in the urinary excretion of creatinine and purine derivatives in heifers

    Directory of Open Access Journals (Sweden)

    Thalita Lázaro Leal

    2007-08-01

    Full Text Available Objetivou-se avaliar as variações nas excreções diárias de creatinina e de uréia na urina utilizando coletas durante seis dias consecutivos em novilhas de origem leiteira; avaliou-se também o efeito da duração do período de coleta sobre a estimativa da produção microbiana obtida a partir dos derivados de purinas na urina. Utilizaram-se onze novilhas de grau de sangue predominantemente Holandês, com 287 ± 49 kg, considerando o grupo de animais como amostra aleatória simples da população. Para comparação entre dias de coletas, empregou-se análise de variância como ferramenta para isolamento do erro puro, adotando-se modelo constituído pelo efeito aleatório de animal e pelo efeito fixo de dia de avaliação. O volumoso foi constituído de silagem de milho fornecida à vontade. Diariamente, foram fornecidos 2,0 kg de concentrado por animal. O período experimental teve duração de seis dias, pois os animais já estavam adaptados à dieta. As coletas de urina foram realizadas utilizando-se sondas de Folley nº 22 ou 26, sendo determinado o volume urinário diário. As excreções urinárias de creatinina, uréia, alantoína, ácido úrico e derivados de purinas totais não foram afetadas pelos dias de coleta de urina. Do mesmo modo, a quantidade estimada de proteína microbiana não diferiu entre os dias de coleta de urina. O valor médio para a excreção de creatinina foi de 30,5 mg/kgPV, 124,84 mg/kg0,75 ou 1,1 mmol/kg0,75. A ausência de efeito de número de dias sobre a excreção de creatinina tem grande aplicação prática, pois, além de reduzir o trabalho com tempos longos de coleta, permite a redução dos custos da pesquisa, podendo ser recomendadas coletas de urina com duração de 24 horas.The objective of this trial was to investigate the daily variation in the urinary excretions of creatinine and nitrogen compounds in dairy heifers. It was also of particular interest to determine whether or not estimation of

  10. Revisão: Polifenóis em cacau e derivados: teores, fatores de variação e efeitos na saúde Review: Polyphenols in cocoa and derivatives: factors of variation and health effects

    Directory of Open Access Journals (Sweden)

    Priscilla Efraim

    2011-09-01

    Full Text Available O número de estudos sobre os polifenóis presentes no cacau tem aumentado consideravelmente nos últimos anos, principalmente relacionando-os aos benefícios à saúde humana. Mais recentemente, alguns trabalhos têm procurado prever o teor de polifenóis em produtos derivados de cacau com base no teor de sólidos desengordurados de cacau (SDC e como o processamento afeta os polifenóis do cacau. As compilações da literatura, em geral, aprofundam os mecanismos dos efeitos benéficos dos compostos fenólicos do cacau no organismo humano. Esta revisão fornece um panorama das principais pesquisas relacionadas aos altos teores de polifenóis presentes no cacau e produtos derivados, bem como aos seus benefícios à saúde. Além disso, busca apresentar aspectos tecnológicos que influenciam o perfil dos compostos fenólicos durante as etapas de processamento. Pelas pesquisas científicas, a destruição dos compostos fenólicos naturalmente presentes nas sementes se dá principalmente nas etapas realizadas para o desenvolvimento do sabor de chocolate, as quais favorecem a diminuição da adstringência e do amargor. Os polifenóis, responsáveis pela capacidade antioxidante do cacau, são drasticamente reduzidos durante a fermentação das sementes e a alcalinização dos nibs e liquors, etapas que envolvem a ocorrência de complexas reações bioquímicas ou uma significativa variação do pH. A produção de chocolate ao leite ou amargo, excluindo o chocolate branco, apresenta um enorme potencial para inovação tecnológica, visto a necessidade da manutenção destes compostos importantes para a saúde, sem prejuízo do sabor agradável, atributo esperado e de grande importância em produtos como o chocolate.The number of studies on cocoa polyphenols has increased significantly in recent years, mainly due to their benefits on human health. Recently, some researchers have studied how to predict the polyphenolic content of cocoa products based

  11. Variação da pressão intraocular após teste submáximo de força no treinamento resistido Intraocular pressure variation after submaximal strength test in resistance training

    Directory of Open Access Journals (Sweden)

    Marcelo Conte

    2009-06-01

    Full Text Available OBJETIVO: Verificar a variação da pressão intraocular (PIO decorrente da aplicação do teste de predição para uma repetição máxima (1RM. MÉTODOS: Foram avaliados em estudo observacional 145 calouros (22,04 ± 4,17 anos; de ambos os sexos do curso de Educação Física da Escola Superior de Educação Física de Jundiaí (ESEFJ. Os critérios de exclusão foram: opacidade de meios, alteração de globo ocular ou ausência de globo ocular. Todos os participantes assinaram o Termo de Consentimento Livre e Esclarecido. A avaliação da PIO foi determinada por duas medidas consecutivas com o tonômetro de Perkins: i pré-teste: antes do teste de 1RM e ii pós-teste: logo após a realização do teste. O teste de 1RM consistiu em predizer o valor de uma repetição máxima através de repetições até a fadiga. Foram utilizados os seguintes exercícios resistidos: supino, pulley dorsal, desenvolvimento, rosca direta e leg press 45º. Como procedimento estatístico foi empregado o teste "t" de Student pareado. RESULTADOS: Ocorreu redução da PIO após a realização do teste de predição de 1RM: 13,48 ± 3,32 vs.10,20 ± 3,72 mmHg (pPURPOSE: To verify the intraocular pressure (IOP after sub-maximal strength test. METHODS: 145 Physical Education freshmen (22.04 ± 4.17 years old; female and male from Superior Physical Education School of Jundiaí (ESEFJ were evaluated in an observacional study. The exclusion criteria were: media opacity and eyeball absence or changes. All subjects agreed to take part in this research and signed up the Informed Consent. IOP was measured by Perkins tonometer: i pretest: just before the submaximal strength test performance and ii post-test: immediately after the strength test. The strength test consisted in the one-repetition-maximum-assessment through repetition until fatigue. Resistance training exercises such as bench press, pulley dorsal high, shoulder press, arm curl and leg press 45º were performed

  12. Variação sazonal nos atendimentos de emergência por asma em Gama, Distrito Federal Seasonal variations in emergency room visits for asthma attacks in Gama, Brazil

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    Laércio Moreira Valença

    2006-08-01

    Full Text Available OBJETIVO: Quantificar o atendimento por asma em um serviço de emergência público e estudar a flutuação sazonal, considerando as condições climáticas locais, caracterizadas por duas estações, uma chuvosa e úmida e outra seca. MÉTODOS: Levantamento retrospectivo conduzido em um hospital geral comunitário. Um total de 37.642 consultas emergenciais por asma, bronquite, pneumonia, infecções de vias aéreas superiores e outras condições foram identificadas durante um período de dois anos. As informações constantes em cada guia de atendimento foram levantadas para posterior análise. RESULTADOS: Asma foi o segundo diagnóstico mais freqüente dentre as condições respiratórias (24%. A maioria das consultas por asma foi feita em crianças de zero a catorze anos (56,6%. A análise de regressão mostrou uma variação sazonal dos atendimentos, com concentração significativamente maior de casos de asma no mês de março (p = 0,0109 e concentração menor nos meses de agosto e setembro (p = 0,0485 e p = 0,0169, respectivamente. A correlação entre asma e clima foi mais significativa em relação à flutuação da umidade defasada de um e dois meses (p = 0,0026 e p = 0,0002, respectivamente. CONCLUSÃO: As visitas por asma ao pronto-socorro foram mais freqüentes durante a estação úmida. O aumento do número de casos cresceu um a dois meses após o aumento da umidade e diminuiu no período seco. Essa correlação positiva levanta a possibilidade de uma relação causal com a proliferação de ácaros domésticos e fungos ambientais.OBJECTIVE: To quantify the number of asthma attacks treated in the emergency room of a public hospital and to study seasonal fluctuations, taking into consideration the local climate, which is characterized by having only two seasons: a rainy/humid season and a dry season. METHODS: A retrospective survey was conducted in a community general hospital. A total of 37,642 emergency room consultations

  13. Genetic variation and environmental effects on beta-conglycinin and glycinin content in Brazilian soybean cultivars Variação genética e ambiental e teores de beta-conglicinina e glicinina em cultivares de soja brasileiras

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    Mercedes Concórdia Carrão-Panizzi

    2008-09-01

    Full Text Available The objective of this work was to determine genetic and environmental effects on beta-conglycinin and glycinin content in Brazilian soybean cultivars. The concentrations of these protein fractions were analyzed by scanning densitometry after electrophoresis, in 90 Brazilian soybean cultivars sown in Ponta Grossa, PR, in 2001. The effects of the sowing location were determined in the cultivar MG/BR 46 (Conquista, sown in 16 locations of Goiás and Minas Gerais states (Central Brazil, and in the cultivar IAS 5, sown in 12 locations of Paraná and São Paulo states (Southern Brazil, in 2002 soybean season. A significant variability for beta-conglycinin (7S and glycinin (11S protein fractions ratio was observed among the 90 Brazilian soybean cultivars. 'MS/BRS 169' (Bacuri and 'BR-8' (Pelotas presented the highest and the lowest 11S/7S ratios (2.76 and 1.17, respectively. Beta-conglycinin protein fractions presented more variability than glycinin protein fractions. Grouping test classified 7S proteins in seven groups, 11S proteins in four groups, and protein fraction ratios (11S/7S in nine groups. Significant effect of sowing locations was also observed on protein fractions contents. There is a good possibility of breeding for individual protein fractions, and their subunits, without affecting protein content.O objetivo deste trabalho foi avaliar os efeitos da variação genética e ambiental sobre os teores de beta-conglicinina e glicinina em cultivares de soja brasileiras. A concentração dessas frações protéicas foi determinada por densitometria após eletroforese, em 90 cultivares de soja, semeadas em Ponta Grossa, PR, em 2001. Os efeitos dos locais de semeadura foram determinados na cultivar MG/BR 46 (Conquista, semeada em 16 locais de Goiás e Minas Gerais, e na cultivar IAS 5, semeada em 12 locais no Paraná e em São Paulo, em 2002. Foi observada variabilidade significativa quanto à razão entre as frações protéicas da beta

  14. Variaţia compoziţiei chimice a cărnii de iepure de casă în funcţie de vârstă

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    MARDARI Tatiana

    2015-12-01

    Full Text Available According to its chemical composition, rabbit meat is superior to beef, mutton and pork, as it is relatively low in fat and contains more protein. This paper presents the results of a study on the variation of chemical composition of rabbit meat slaughtered at the age of 2, 4 and 7 months. The initial humidity of the meat is on average 68.28 %, while the hygroscopic humidity in the rabbits slaughtered at the age of 2 months constitutes 3.17 % and it is at the highest level (compared to 2.95 % at the age of 7 months. The dry matter constitutes on average 26.46 % and the organic one - 25.46 %. The highest values of these indices were recorded at the age of 7 months- 31.76 % (dry matter and 31.03 % (organic matter. The highest quality of rabbit meat could be obtained from the age of 2 to 4 months when the ratio between water and dry matter constitutes 3.31/1 and 3,09/1.3.31/1 respectively. Rezumat. După compoziţia chimică, carnea de iepure este superioară cărnii de vită, precum şi celei de oaie sau de porc, conţine puţină grăsime şi relativ mai multă proteină. În acest articol sunt prezentate rezultatele unui studiu privind variaţia compoziţiei chimice a cărnii de iepuri sacrificaţi la vârsta de 2, 4 şi 7 luni. Umiditatea iniţială din carne constituie, în medie, 68,28 %, umiditatea higroscopică la iepurii sacrificaţi la 2 luni constituie 3,17 % şi este la cel mai înalt nivel (faţă de 2,95 % la 7 luni de viaţă. Substanţa uscată constituie, în medie, 26,46 %, iar cea organică – 25,46 %, cele mai înalte valori ale acestor indici înregistrându-se la vârsta de 7 luni – 31,76 % (substanţa uscată şi 31,03 % (substanţa organică. Carnea de iepure este de cea mai bună calitate la vârsta de la 2 la 4 luni, când raportul dintre apă şi substanţa uscată constituie 3,31/1 şi respectiv 3,09/1.

  15. Variação temporal na prevalência do excesso de peso e obesidade em adultos: Brasil, 2006 a 2009 Temporal variation in the prevalence of weight and obesity excess in adults: Brazil, 2006 to 2009

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    Denise Petrucci Gigante

    2011-09-01

    Full Text Available Excesso de peso e obesidade são problemas de saúde pública que atingem parcela importante da população mundial. Este estudo tem o objetivo de descrever as tendências nas prevalências do excesso de peso e da obesidade, no período de 2006 e 2009, obtidas por meio de entrevistas telefônicas em 27 cidades brasileiras com uma população de 18 anos ou mais. O índice de massa corporal (IMC foi calculado a partir do peso e altura referidos; o excesso de peso e obesidade foram definidos por IMC >25 kg/m² e >30 kg/m², respectivamente. A variação temporal das prevalências do excesso e peso e de obesidade é apresentada para homens e mulheres, de acordo com grupo etário, escolaridade, união estável e cor da pele. A regressão de Poisson foi utilizada na análise. As prevalências do excesso de peso foram 43,0, 42,7, 44,2 e 46,6%, para cada ano do período de 2006 a 2009, respectivamente. Para obesidade, no mesmo período, foram encontradas as seguintes prevalências: 11,4, 12,7, 13,2 e 13,8%. A tendência temporal variou em relação às variáveis demográficas e econômicas. O aumento nas prevalências ocorreu nas mulheres e entre os mais jovens. A tendência temporal foi independente do estado civil dos entrevistados, mas o aumento nas prevalências ocorreu em mulheres brancas e com menor escolaridade. Os resultados do presente estudo confirmam a urgência da necessidade de medidas efetivas de prevenção e controle, uma vez que a tendência do aumento está ocorrendo em um curto intervalo de tempo, especialmente entre os jovens.Overweight and obesity are public health issues that affect an important part of the world population. This study aims at describing the trends in overweight and obesity prevalence rates from 2006 to 2009, by means of telephone surveys in 27 Brazilian cities, with a population aged 18 years or older. The body mass index (BMI was calculated by the reported height and weight; overweight and obesity were

  16. Variações fenológicas das espécies do cerrado em Emas - Pirassununga, SP Phenological variations of the cerrado species in Emas (Pirassununga, SP

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    Marco Antonio Batalha

    1997-07-01

    Full Text Available Foi estudada a flora vascular de uma área de cerrado, situada no distrito de Emas, município de Pirassununga, Estado de São Paulo (aproximadamente, 22º02'S e 47º30'W. Entre abril de 1994 e abril de 1995, realizou-se um levantamento florístico, em que foram amostradas 358 espécies. A partir dos dados deste levantamento, estudaram-se as variações fenológicas das espécies, procurando analisá-las como estratégias adaptativas. Os componentes herbáceo-subarbustivo e arbustivoarbóreo comportaram-se de maneira distinta. As espécies arbustivo-arbóreas floresceram principalmente no início da estação chuvosa, enquanto que as herbáceo-subarbustivas produziram flores, de modo geral, apenas no final da estação úmida, após período de acúmulo de carboidratos. As espécies do componente herbáceo-subarbustivo tiveram pico de frutificação no final da estação chuvosa, qualquer que fosse a síndrome de dispersão de seus diásporos. Já as espécies do componente arbustivo-arbóreo apresentaram comportamentos distintos, conforme a síndrome de dispersão. As espécies zoocóricas frutificaram ao longo de toda estação úmida, enquanto que as anemocóricas e autocóricas produziram frutos, principalmente no início da estação seca.The vascular flora of the cerrado in Emas district, Pirassununga municipality, São Paulo State (approximately 22º02'S and 47º30'W was studied. Between April 1994 and April 1995 a floristic survey was carried out, when 358 species, representing 227 genera and 78 families, were found. During this survey, the phenologycal variations were observed and analysed as adaptive strategies. The woody and herbaceous components had distinct behaviours. The woody species flowered mainly at the beginning of the rainy season, while the herbaceous ones produced flowers generally at the end of that season, after a period of carbohydrate accumulation. The herbaceous species produced fruits specially at the end of the

  17. Tabagismo e variação ponderal: a fisiopatologia e genética podem explicar esta associação? Smoking and changes in body weight: can physiopathology and genetics explain this association?

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    Raquel Chatkin

    2007-12-01

    Full Text Available O tabagismo é a principal causa de morte prevenível na maioria dos países, inclusive no Brasil. Parar de fumar é uma estratégia importante para reduzir a morbidade e mortalidade associada às doenças tabaco-relacionadas. Sabe-se da relação inversa entre uso de nicotina e peso corporal, onde o índice de massa corporal tende a ser menor em fumantes quando comparados aos não fumantes. Além disso, abstinência tabágica resulta em aumento de peso, sendo que ex-fumantes geralmente aumentam de 5 a 6 kg, mas cerca de 10% adquirem mais de 10 kg. O tratamento farmacológico para a cessação do tabagismo pode atenuar este ganho de peso. O aumento de peso na cessação do tabagismo como contributório à epidemia de obesidade é pouco estudado. Nos EUA, calcula-se que a fração do problema atribuível à cessação do tabagismo seja de 6% para homens e 3,2% para mulheres. Os mecanismos não são claros, mas há evidências mostrando que a dopamina e serotonina diminuem a ingestão alimentar. A administração de nicotina por qualquer via eleva agudamente os níveis destes neurotransmissores no cérebro, causando menor necessidade de ingestão energética e diminuindo o apetite. Além disso, a nicotina tem efeito direto no metabolismo do tecido adiposo, influenciando a taxa de ganho ponderal após a cessação do tabagismo. A leptina, grelina e neuropeptídio Y são peptídeos que podem contribuir para esta relação inversa entre nicotina e índice de massa corporal, em um papel ainda não determinado como conseqüente ou causador das variações ponderais.Tobacco use is the leading preventable cause of death in most countries, including Brazil. Smoking cessation is an important strategy for reducing the morbidity and mortality associated with tobacco-related diseases. An inverse relationship between nicotine use and body weight has been reported, in which body weight tends to be lower among smokers than among nonsmokers. Smoking abstinence

  18. Nomenclature, variation, and the biological species concept in Lamasina (Lycaenidae: Theclinae: Eumaeini Nomenclatura, variação e o conceito biológico de espécie em Lamasina (Lycaenidae: Theclinae: Eumaeini

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    Robert K. Robbins

    2008-03-01

    Papilio ganimedes Cramer, 1775 é invalidado e um possível síntipo é ilustrado. Os resultados da análise de variação do complexo Lamasina ganimedes diferem significativamente daqueles publicados anteriormente, fornecendo poucas evidências para sustentar a hipótese que L. lathyi (Bálint, 2005 é uma espécie distinta sob o conceito biológico de espécie. Lamasina lathyi é um sinônimo de L. ganimedes syn. nov. A evidência estatística falseia categoricamente a hipótese publicada que os complexos de espécies L. rhaptissima (Johnson, 1991 (14 machos e L. columbia (Bálint, 2005 (8 fêmeas são diferentes e não machos e fêmeas do mesmo complexo. Lamasina columbia é endêmica do oeste da Colômbia. A hipótese de L. rhapsodia (Bálint, 2005, da Bolívia, ser uma espécie válida não está tão bem suportada quanto as hipóteses que consideram o único exemplar conhecido da espécie como uma variante geográfica ou um indivíduo aberrante. Lamasina rhapsodia é um sinônimo de L. rhaptissima syn. nov. Foi observada uma semelhança superficial entre os gêneros Paiwarria Kaye, 1904 e Lamasina referente aos padrões das asas em vista ventral. É apresentada uma checklist para Lamasina.

  19. Causas de variação nos preços de bovinos nelore elite no Brasil Causes of variation in the prices of nelore elite cattle in Brazil

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    João Cláudio do Carmo Paneto

    2009-02-01

    Full Text Available Este trabalho teve por objetivo estudar as causas de variação nos preços de bovinos da raça nelore pertencentes a rebanhos de seleção, os quais foram comercializados em leilões, para verificar as influências das avaliações genéticas e dos julgamentos de exterior sobre esses preços. Para tanto, foram computados os preços de venda de 426 bovinos da referida raça em 12 leilões ocorridos em diversas localidades brasileiras (regiões Centro-Oeste, Norte e Sudeste, entre os anos de 2002 e 2005. O valor médio foi de R$ 3.325,49, sendo o mínimo de R$ 1.400,00 e o máximo de R$ 10.500,00. Esses dados foram digitados juntamente com outras informações que eram apresentadas nos catálogos dos leilões. As informações registradas incluíram o sexo de cada animal, o nome do leilão e as DEPs informadas nos catálogos. Além da avaliação da influência das informações dos catálogos, também foi avaliada a influência das informações dos reprodutores, pais dos animais vendidos nos leilões, envolvendo suas DEPs publicadas em um sumário de reprodutores da raça e as pontuações de suas progênies em julgamentos. Os métodos estatísticos aplicados foram análises de variâncias e análises de agrupamento (método K-médias. Como resultado, foi observado que animais com superioridade genética em características relacionadas a desempenho ponderal, considerando-se os efeitos diretos e maternos, foram valorizados ao serem comercializados nos leilões. Em contra-partida, a pontuação dos reprodutores nos julgamentos não teve influência significativa sobre os preços médios de venda de suas progênies nos leilões.This study aimed to understand the causes of variation in the marketing prices of elite flock nelore cattle commercialized by auction, especially to verify the influences of EPDs and visual assessment. The selling prices of 426 animals from the nelore breed commercialized during 12 auctions held in various Brazilian

  20. Variação do teor de umidade e da densidade básica na madeira de sete espécies de eucalipto Variation of the moisture content and specific gravity in the wood of seven eucalypt species

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    José Tarcísio da Silva Oliveira

    2005-02-01

    Full Text Available As variações de umidade e da densidade do lenho das árvores são as principais causas dos defeitos de secagem, como o empenamento e fendilhamento das peças de madeira. Os tipos de madeira presentes em um tronco estão relacionados com as variações dessas duas importantes propriedades físicas. Os gradientes de umidade e da densidade da madeira de sete espécies de eucalipto foram avaliados nas direções radial e longitudinal do tronco de árvores recém-abatidas. Os resultados apontaram uma maior homogeneidade de distribuição de umidade dentro das árvores de E. paniculata e E. citriodora, indicada pelos coeficientes de variação e desvio-padrão. O diferencial de umidade da madeira nas regiões internas do tronco de E. paniculata e E. citriodora foi de 20% e de E. urophylla e E. grandis, de 80%. A densidade básica da madeira aumentou na direção radial do tronco, e cada espécie de eucalipto apresentou um modelo de variação.The occurrence of high moisture and density gradients inside of the tree is related with drying defects, especially those characterized by warp and split of the wood. The unequal behavior of wood pieces due to variation of these two properties can be attributed to differences within the wood that constitutes the log. Considering the importance of knowing the moisture and density gradients in eucalyptus trees, this work had as objective evaluating the variations of the moisture content and specific gravity in the radial and longitudinal directions of the trees of seven eucalypts species. Based on the results concerning the moisture distribution inside the tree, there was a great homogeneity in the species of E. paniculata and E. citriodora, sustained by the low values of variation coefficient and standard deviation. In these species, the moisture differential among the inner and outer parts of the log rarely reached 20%, while for the logs of E. urophylla and E. grandis, this diferencial reached 80%. In spite of

  1. Caring presence in practice: facilitating an appreciative discourse in nursing.

    Science.gov (United States)

    du Plessis, E

    2016-09-01

    To report on an appreciation of caring presence practised by nurses in South Africa in order to facilitate an appreciative discourse in nursing and a return to caring values and attitudes. Appreciative reports on caring presence are often overlooked. Media may provide a platform for facilitating appreciation for caring presence practised by nurses. Such an appreciation may foster further practice of caring presence and re-ignite a caring ethos in nursing. This article provides an appreciative discourse on caring presence in nursing in the form of examples of caring presence practised by nurses. An anecdotal approach was followed. Social media, namely narratives on caring presence shared by nurses on a Facebook page, and formal media, namely news reports in which nurses are appreciated for their efforts, were used. Deductive content analysis was applied to analyse the narratives and news reports in relation to a definition of caring presence and types of caring presence. The analysis of the narratives and news reports resulted in an appreciative discourse in which examples of nurses practising caring presence could be provided. Examples of nurses practising caring presence could be found, and an appreciative discourse could be initiated. Appreciation ignites positive action and ownership of high-quality health care. Leadership should thus cultivate a culture of appreciating nurses, through using media, and encourage nurses to share how caring presence impact on quality in health care. © 2016 International Council of Nurses.

  2. Análise multinível das variações no índice de massa corporal entre adultos, Brasil, 2006 Análisis multinivel de las variaciones en el índice de masa corporal entre adultos, Brasil, 2006 A multilevel analysis of variations in body mass index among adults, Brazil, 2006

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    Rosely Sichieri

    2009-11-01

    Full Text Available OBJETIVO: Analisar variações do índice de massa corporal (IMC entre adultos segundo fatores individuais e características ambientais das cidades. MÉTODOS: Foram utilizados dados de 2006 do Sistema de Vigilância de Fatores de Risco e Proteção para Doenças Crônicas por Inquérito Telefônico (VIGITEL. Trata-se de inquérito baseado em entrevistas telefônicas realizadas em amostras probabilísticas da população com idade >18 anos nas 26 capitais estaduais brasileiros e no Distrito Federal. A análise de fatores associados incluiu variáveis socioeconômicas e demográficas, individuais e ambientais da cidade referentes a 49.395 participantes do VIGITEL. O consumo alimentar foi avaliado por escore de alimentação saudável e pelo consumo de frutas e hortaliças cinco ou mais vezes por dia. Atividade física foi avaliada pela freqüência e duração de exercícios, e pela presença local de equipamentos para realizá-los. As associações foram testadas em modelos lineares multinível (pOBJETIVO: Analizar variaciones del índice de masa corporal (IMC entre adultos según factores individuales y características ambientales de las ciudades. MÉTODOS: Fueron utilizados datos de 2006 del Sistema de Vigilancia de Factores de Riesgo y Protección para Enfermedades Crónicas por Pesquisa Telefónica (VIGITEL. Se trata de pesquisa basada en entrevistas telefónicas realizadas en muestras probabilísticas de la población con edad >18 años en las 26 capitales estatales brasileras y en el Distrito Federal. El análisis de factores asociados incluyó variables socioeconómicas y demográficas, individuales y ambientales de las ciudades referentes a 49.395 participantes del VIGITEL. El consumo alimentario fue evaluado por escore de alimentación saludable y por el consumo de frutas y hortalizas cinco o más veces por día. Actividad física fue evaluada por la frecuencia y duración de ejercicios, y por la presencia local de equipamientos para

  3. Barred Owl Habitat and Prey: A Review and Synthesis of the Literature

    OpenAIRE

    Livezey, Kent B.

    2007-01-01

    Barred Owls (Strix varia) historically inhabited the forests of eastern North America. During the last century, they expanded their range to include forests throughout the southern provinces of Canada, southeastern Alaska, British Columbia, Washington, Oregon, and northern California. To date, there has been no synthesis of the varied habitats or prey used by Barred Owls in their expanded range. Here I review and synthesize studies concerning habitat (N  =  114) and prey (N  =  43) of Barred ...

  4. The role of presence in virtual reality exposure therapy.

    Science.gov (United States)

    Price, Matthew; Anderson, Page

    2007-01-01

    A growing body of literature suggests that virtual reality is a successful tool for exposure therapy in the treatment of anxiety disorders. Virtual reality (VR) researchers posit the construct of presence, defined as the interpretation of an artificial stimulus as if it were real, to be a presumed factor that enables anxiety to be felt during virtual reality exposure therapy (VRE). However, a handful of empirical studies on the relation between presence and anxiety in VRE have yielded mixed findings. The current study tested the following hypotheses about the relation between presence and anxiety in VRE with a clinical sample of fearful flyers: (1) presence is related to in-session anxiety; (2) presence mediates the extent that pre-existing (pre-treatment) anxiety is experienced during exposure with VR; (3) presence is positively related to the amount of phobic elements included within the virtual environment; (4) presence is related to treatment outcome. Results supported presence as a factor that contributes to the experience of anxiety in the virtual environment as well as a relation between presence and the phobic elements, but did not support a relation between presence and treatment outcome. The study suggests that presence may be a necessary but insufficient requirement for successful VRE.

  5. Relations between the tendency to invest in virtual presence, actual virtual presence and learning outcomes in educational computer games

    NARCIS (Netherlands)

    Schrader, Claudia; Bastiaens, Theo

    2018-01-01

    The study examines whether the effect of virtual presence on learning is influenced by learner characteristics. More specifically, the focus is on how the variation in the actual experience of virtual presence and learning is related to learners' individual tendency to invest in virtual presence for

  6. The Interactions between Facilitator Identity, Conflictual Presence, and Social Presence in Peer-Moderated Online Collaborative Learning

    Science.gov (United States)

    Xie, Kui; Lu, Lin; Cheng, Sheng-Lun; Izmirli, Serkan

    2017-01-01

    Research has focused on the significance of social presence in online learning. However, peer interaction does not always result in positive emotions and feelings; it can trigger tension, distress, and anger within a learning community. Therefore, conflictual presence, as a carrier of negative valence within presence, is also a critical element…

  7. Variações diárias nas excreções de creatinina e derivados de purinas em novilhos Daily variation in the excretion of creatinine and purine derivatives in steers

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    Thalita Lázaro Leal

    2007-08-01

    Full Text Available Objetivou-se estimar as variações nas excreções diárias de creatinina, uréia e derivados de purinas (DP na urina utilizando coletas durante seis dias consecutivos e avaliar as concentrações de nitrogênio uréico no plasma (NUP em novilhos. Utilizaram-se quatro animais, machos castrados, de grau de sangue predominantemente Holandês, peso médio de 445 kg, distribuídos em quadrado latino 4 x 4, com os tratamentos definidos em esquema fatorial 2 x 2 (dois níveis de uréia em substituição ao farelo de soja: 0 e 100%; e dois níveis de oferta de concentrado: 0,75 e 1,25% do PV e a comparação entre dias de avaliação, em esquema de parcelas subdivididas. O volumoso, constituído de silagem de capim-elefante (80% e silagem de sorgo (20%, foi fornecido à vontade. A síntese de compostos nitrogenados microbianos, estimada a partir da excreção de DP, foi maior quando houve maior oferta de concentrado e menor quando a proteína do farelo de soja foi substituída pela uréia. Não houve efeito da interação níveis de concentrado ´ níveis de uréia nem efeito de níveis de uréia sobre a concentração de NUP e a excreção de N-uréico na urina. As excreções urinárias de uréia, alantoína, ácido úrico e a quantidade estimada de proteína microbiana não foram afetadas pelos dias de coleta de urina. Não houve diferença na excreção de creatinina entre os dias de coleta, sendo obtido valor médio de 25,47 mg/kgPV, 117,92 mg/kg0,75 ou 1,04 mmol/kg0,75. A ausência de efeito de número de dias sobre a excreção de creatinina tem grande aplicação prática. Na estimativa da excreção de creatinina e de derivados de purinas, recomendam-se coletas de urina com duração de 24 horas.The objective of this trial was to investigate the daily variation in the urinary excretions of creatinine, urea and purine derivatives (PD as well as the plasma concentration of urea-N (PUN in steers. Four castrated Holstein steers averaging 445 kg

  8. Variação na temperatura do solo em três sistemas de manejo na cultura do feijão Soil temperature variation in three different systems of soil management in blackbeans crop

    Directory of Open Access Journals (Sweden)

    Vanderlei Rodrigues da Silva

    2006-06-01

    Full Text Available A temperatura do solo é uma propriedade que afeta diretamente o crescimento das plantas e é influenciada pelo balanço de energia na superfície do solo. Dessa maneira, os sistemas de manejo do solo têm efeito na temperatura, visto que alteram as condições da superfície do solo. O objetivo deste estudo foi determinar o efeito de três sistemas de manejo na temperatura do solo durante todo o ciclo do feijoeiro. O delineamento experimental foi de blocos ao acaso, com os seguintes preparos do solo: plantio direto há sete anos (PD; plantio direto revolvido por uma aração e uma gradagem (PDar e plantio direto revolvido por escarificador (PDesc, distribuídos em quatro blocos. O solo do experimento é classificado como Argissolo Vermelho-Amarelo distrófico arênico. A temperatura do solo foi determinada durante todo o ciclo do feijoeiro, realizando-se leituras a cada 10 min, em um sistema automatizado de coleta de dados, com sensores do tipo termopar (cobre-constantan, instalados na profundidade de 0,025 m e a 0,10 m. Foram determinadas a densidade do solo e a produtividade do feijoeiro. Durante todo o ciclo do feijoeiro, o PD apresentou a menor temperatura máxima e a menor amplitude diária entre os sistemas de manejo. Na profundidade de 0,025 m, o PDar apresentou temperatura máxima de 42,2 °C, o PDesc de 43,7 °C e o PD de 36,1 °C. A variação diária da temperatura do solo num dia com 12 h de sol, no início do desenvolvimento das plantas (02/12/2002, indicou que a maior temperatura ocorreu próximo às 15 h, com valores de 40 ºC, no PDar, e 30 ºC, no PD, na profundidade de 0,025 m. Quando as plantas sombreavam o solo, não houve diferenças na temperatura do solo entre os sistemas de manejo. As diferenças na temperatura do solo não provocaram diferenças na produtividade de grãos do feijoeiro, haja vista que os maiores efeitos da temperatura do solo ocorrem na germinação e emergência das plântulas.Soil temperature is a

  9. Variações nos métodos de aplicação dos herbicidas Diuron e Tripluralin na cultura do algodoeiro Methods of application of the herbicides Diuron and Trifluralin in cotton

    Directory of Open Access Journals (Sweden)

    Aldo Alves

    1967-01-01

    Full Text Available Foram estudados os efeitos das variações nos métodos de aplicação dos herbicidas Diuron e Trifluralin na cultura algodoeira, para verificar sua eficiência no combate às ervas daninhas. O tratamento Trifluralin aplicado em pré-plantio incorporado, provocou excelente combate às ervas daninhas gramíneas, porém irrisória redução da população das dicotiledôneas. A aplicação de Trifluralin em pré-plantio incorporado e a de Diuron em pré-emergência, aumentaram consideravelmente a área de contrôle nos dois grupos de ervas más. O tratamento Diuron aplicado em pré-emergência foi bastante efetivo no combate às ervas de "fôlhas largas", enquanto que no combate às gramineas não foi tão eficiente. O incorporação do Diuron, aplicado em pré-plantio, não aumentou a eficiência do produto químico. A redução da dose de Diuron em pré-plantio incorporado ou em pré-emergência não proporcionou combate adequado às ervas más.1 - An experiment to study the various modalities of the application of the herbicides diuron and trifluralin in cotton plantings was carried out in purple latosol soil, Chapadão series. The two herbicides were applied in various doses and at different times. The most common weeds in the trial area were capim pé-de-galinha (goosegrass, capim carrapicho (sandbur, capim colchão (crabgrass, beldroega (purslane, carraplcho de carneiro, and poaia. 2 - The effectiveness of diuron (1.60 kg/ha, applied pre-planting, was not increased by incorporation into the soil. The control of weeds was efficient, but the yield was inferior to that of plots without incorporation. Of the weeds that survived the treatment, a predominance of grass species was noted. Some of the cotton leaves turned yellow in plots that received this herbicide, but this chlorosis was temporary and the plants regained their normal color within a few weeks. The tolerance of cotton for the treatments did not appear to be affected by the method of

  10. Variação do fluxo sanguíneo da artéria central da retina durante as diferentes fases do ciclo menstrual ovulatório Central retinal artery blood flow variation during menstrual cycle

    Directory of Open Access Journals (Sweden)

    Luiz Carlos Viana

    2007-03-01

    Full Text Available OBJETIVO: avaliar a resistência vascular da artéria central da retina, por meio do fluxo Doppler, nas diferentes fases do ciclo menstrual ovulatório. MÉTODOS: estudo observacional, longitudinal e prospectivo com avaliação de 34 mulheres saudáveis, submetidas a estudo dopplerfluxométrico do fundo do olho para avaliação da resistência vascular da artéria central da retina nas posições sentada e deitada, durante quatro fases do ciclo menstrual: fase folicular inicial, fase folicular média, fase periovulatória e fase lútea média. A confirmação da ovulação no ciclo de estudo foi feita pela dosagem de progesterona sérica na fase lútea média. Foram avaliados os índices de pulsatilidade (IP e de resistência, e as velocidades máxima, mínima e média. RESULTADOS: a idade média foi de 29,7 anos. Não foram observadas diferenças entre os índices obtidos para ambos os olhos; assim, utilizamos as médias dos índices para realizar o cálculo estatístico. Quando comparadas às posições de realização do exame, detectou-se um IP maior na posição sentada; assim, as análises foram avaliadas em separado, respeitando-se a posição da paciente. O IP da artéria central da retina, avaliado com a paciente deitada, variou durante o ciclo menstrual, apresentando-se significativamente mais baixo nas fases folicular média (1,5±0,3 e periovulatória (1,5±0,3 quando comparadas às fases folicular precoce (1,7±0,4 e lútea média (1,7±0,4. Quando a avaliação foi feita com a paciente sentada não foram observadas diferenças para as diferentes fases do ciclo. CONCLUSÕES: num ciclo menstrual ovulatório ocorre diminuição da resistência vascular na artéria central da retina e posterior reversão do efeito, como demonstrado pelas variações do IP.PURPOSE: to evaluate the vascular blood flow of the central retinal arteries using dopplervelocimetry in the different phases of the ovulatory menstrual cycle. METHODS: we performed

  11. Variações genéticas em populações de Eucalyptus spp. detectadas por meio de marcadores moleculares Genetic variations in Eucalyptus spp. genotypes detected by means of molecular markers

    Directory of Open Access Journals (Sweden)

    Ronaldo Pereira Caixeta

    2003-06-01

    Full Text Available A tecnologia de marcadores moleculares, aliada às técnicas clássicas do melhoramento, pode contribuir significativamente para o conhecimento básico da cultura e do caráter estudado e para a geração e o desenvolvimento de produtos melhorados. O objetivo deste trabalho foi utilizar marcadores RAPD para detectar e maximizar a variabilidade genética em genótipos Eucalyptus, identificando cruzamentos favoráveis para um programa de melhoramento florestal, visando o uso múltiplo. Foram analisados 44 genótipos de híbridos naturais do gênero Eucalyptus, plantados na região noroeste de Minas Gerais. Os marcadores moleculares RAPD apresentaram poder de discriminação eficiente entre os 44 genótipos avaliados, constatando-se uma distância genética média entre os genótipos de Eucalyptus de 54% e divergência genética variando de 24 a 73%. Este fato indica que entre os indivíduos analisados existe uma ampla base genética, o que possibilita a manipulação desse material em programas de melhoramento. A distância genética entre os genótipos 5 e 9; 9 e 10; 9 e 19; 9 e 25; 9 e 33; 9 e 35; 9 e 36; 9 e 44; 10 e 33; 12 e 19; 12 e 33; e 12 e 39 apresentou-se maior ou igual a 70%. A análise de agrupamento estabelecida, utilizando UPGMA e o critério de corte de 80% da distância genética total, permitiu a formação de nove grupos distintos. Esses grupos apresentaram divergência genética média superior a 60%. A maior média de distância ocorreu entre o grupo I e os demais, com 67%. A avaliação por marcadores moleculares RAPD forneceu uma identificação direta da variação genética dos genótipos e, neste sentido, novos cruzamentos para produção de híbridos específicos poderão ser gerados, aumentando, assim, a divergência genética e a produtividade de derivados de madeira de qualidade superior para usos múltiplos em programas de melhoramento florestal.Molecular marker technology combined with the classic breeding techniques

  12. Free and total GMP (glycomacropeptide contents of milk during bovine lactation Variação dos teores de GMP (glicomacropeptídeo livre e total no leite bovino durante a lactação

    Directory of Open Access Journals (Sweden)

    Andréa Maria Furlanetti

    2003-12-01

    dos problemas sanitários concentrou-se próximo ao parto, com poucas e espaçadas ocorrências de mastites clínicas. Os resultados do teste de CMT mostraram reações compatíveis às fases da lactação. Para o GMP livre as maiores variações ocorreram em função do período de lactação e em conseqüência de mastites clínicas e subclínicas. Valores elevados foram observados no início da lactação (5,87mg de ácido siálico/L de leite, normalizando para valores próximos de 3,30mg/L já ao final do segundo mês e voltando a elevar-se no terço final da lactação. Em média, as mesmas tendências foram observadas para o teor de GMP total liberado pela ação de coalho comercial, iniciando com valores ligeiramente elevados (35,59mg/L, tornando-se normal e assim se mantendo até o sexto mês com valores próximos a 27,15mg/L, e novamente elevando-se gradualmente até o final da lactação, com 58,35mg de ácido siálico/L de leite. Esses resultados mostram-se úteis para a correta interpretação de métodos aplicados à seleção do leite, seja em relação ao "status" proteolítico da matéria-prima ou mesmo para coibição de fraudes por adição de soro ao leite.

  13. Perception of Affordances and Experience of Presence in Virtual Reality

    Directory of Open Access Journals (Sweden)

    Paweł Grabarczyk

    2016-11-01

    Full Text Available Recent developments in virtual reality technology raise a question about the experience of presence and immersion in virtual environments. What is immersion and what are the conditions for inducing the experience of virtual presence? In this paper, we argue that crucial determinants of presence are perception of affordances and sense of embodiment. In the first section of this paper, we define key concepts and introduce important distinctions such as immersion and presence. In the second and third sections, we respectively discuss presence, immersion and their determinants in detail. In the fourth and fifth sections, we argue for the importance of perception of affordances and sense of embodiment in increasing the degree of presence. Finally, we show the consequences of our view and discuss possible future implications.

  14. Disorder affects judgements about a neighbourhood: police presence does not

    Directory of Open Access Journals (Sweden)

    Jessica Hill

    2014-03-01

    Full Text Available Many police forces operate a policy of high visibility in disordered neighbourhoods with high crime. However, little is known about whether increased police presence influences people’s beliefs about a neighbourhood’s social environment or their fear of crime. Three experimental studies compared people’s perceptions of social capital and fear of crime in disordered and ordered neighbourhoods, either with a police presence or no police presence. In all studies, neighbourhood disorder lowered perceptions of social capital, resulting in a higher fear of crime. Police presence or absence had no significant effect. The pervasive effects of disorder above other environmental cues are discussed.

  15. Variação temporal de características morfológicas de folhas em dez espécies do Parque Nacional da Restinga de Jurubatiba, Macaé, RJ, Brasil Temporal variation of morphological leaf traits in ten species from Restinga of Jurubatiba National Park, Macaé, Rio de Janeiro State, Brazil

    Directory of Open Access Journals (Sweden)

    Bruno Henrique Pimentel Rosado

    2007-09-01

    Full Text Available Ordenar espécies em relação a um contínuo de variação de características foliares pode ser útil para inferir sobre a suscetibilidade de uma comunidade a alterações na disponibilidade de recursos e/ou condições ambientais ao longo do tempo. Dez espécies lenhosas de restinga foram acompanhadas quanto à variação temporal de atributos morfológicos foliares. Folhas de dez espécies de restinga foram coletadas nos meses de fevereiro, abril e agosto ao longo de três anos para caracterização da variação temporal da massa de folha por unidade de área (MFA, suculência (SUC, espessura (ESP e densidade (DEN. As espécies apresentaram uma tendência de valores mais elevados para as características estudadas nos meses mais secos. A partir da comparação sazonal e interanual da MFA, SUC, ESP e DEN sugerimos que a natureza das respostas das plantas à heterogeneidade temporal na disponibilidade de água foi convergente, independentemente do padrão fenológico de produção foliar e filogenia. Portanto, a similaridade observada entre as espécies na dinâmica temporal dos atributos foliares indica a disponibilidade hídrica como um fator determinante para o sucesso na ocupação das planícies arenosas costeiras do norte fluminense.Ranking species in relation to a continuum of leaf-trait variation can be useful to infer community susceptibility to changes in resource availability and/or environmental conditions over time. Leaves of ten woody restinga species were sampled in February, April and August over a period of 3 years to characterize temporal variability of leaf mass per area (LMA, succulence (SUC, thickness (THI and density (DEN. The species showed a trend toward higher leaf-trait values in dry months during the three-year study. Based on seasonal and interannual comparison of LMA, SUC, THI and DEN we suggest that plant responses to temporal heterogeneity in water availability were convergent, independent of leaf phenological

  16. Classificação de coeficientes de variação na experimentação com nutrição de eqüinos Classification of the coefficient of variation in experimentation with equine nutrition

    Directory of Open Access Journals (Sweden)

    A.M.Q. Lana

    2006-10-01

    Full Text Available Foi realizada a classificação de coeficientes de variação dos coeficientes de digestibilidade da matéria seca, matéria orgânica, proteína bruta, fibras em detergente neutro e ácido, energia bruta, fibra bruta, celulose, hemicelulose, lignina, extrato etéreo e ganho de peso diário, com base em artigos científicos e teses em eqüinocultura. Os coeficientes de variação foram classificados em: baixo [(m+2DP]. Todas as respostas medidas apresentaram distribuição normal pelo teste Lilliefors. Quanto aos coeficientes de digestibilidade da fibra em detergente neutro e celulose, houve concordância entre a classificação proposta e a sugerida na literatura, sendo os mais discrepantes os coeficientes de digestibilidade da energia bruta e lignina. Desse modo, para cada variável analisada existe distribuição diferenciada dos coeficientes de variação, o que sugere a necessidade de classificação específica para as respostas medidas em nutrição de eqüinos.Coefficients of variation (CV distribution for several variables in equine nutrition were obtained. The data are from theses and published scientific papers in equine nutrition. The CV were classified as low [CV£(m-1sd]; medium [(m-1sd(m+2sd]. The Lilliefors test for all variables showed no discrepancy from normal distribution. The distributions obtained for coefficients of digestibility for cellulose and fibre in neutral and acid detergent, were close enough to the classification suggested in the literature. However, the distributions for coefficient of digestibility for gross energy and lignin, showed high discrepancies from this classification suggesting that trial precision should be evaluated according to the variable considered. There is a different distribution for coefficients of variation for each variable suggesting the need of specific classification for each characteristic in equine studies.

  17. Variação anatômica radial do lenho de açoita-cavalo (Luehea divaricata e sua influência na densidade aparente. Radial variation of wood anatomy in açoita-cavalo (Luehea divaricata and its influence on the specific gravity.

    Directory of Open Access Journals (Sweden)

    Eduardo Luiz LONGUI

    2009-12-01

    Full Text Available Variações entre as dimensões e frequênciasdas células da madeira existem entre espéciesdiferentes, entre indivíduos da mesma espécie ouainda dentro da mesma árvore nas direções radial eaxial. Essa variação influencia diretamente nadensidade aparente e consequentemente no uso dasdiferentes madeiras. O presente estudo determinoua variação anatômica radial e sua influência nadensidade aparente no lenho de árvores de Luehea divaricata, a partir de amostras coletadas no DAP,por meio de método destrutivo. Para a avaliaçãoanatômica e da densidade aparente foram empregadastécnicas usuais em anatomia e propriedades físicasda madeira e os dados tratados estatisticamente.Os resultados revelaram que o diâmetro dos vasos,espessura da parede das fibras e a densidadeaparente foram significativamente menores na regiãoda medula, já o lume das fibras foi significativamentemaior nesta região, que também apresentou raiosmais volumosos. Sugere-se que fibras com paredesmais finas e raios com maior volume na região damedula contribuíram de forma determinante paraos menores valores de densidade aparente.Variations between the size and frequencyof the wood cells occur among differentspecies, trees of the same species or even withinthe same tree in the radial and axial directions.These variations affect directly the specific gravityand consequently the use of different woods.This study determined the radial anatomicalvariation and its influence on specific gravity ofthe wood of Luehea divaricata trees, from samplescollected on DBH by using destructive method.For the evaluation of anatomical characteristicsand specific gravity were employed standardtechniques in anatomy and physical propertiesof wood and the data analyzed statistically.The results revealed significantly lower vesseldiameter, fiber wall thickness and specific gravityin pith, fiber lumen was significantly higher inthis region, which also showed very large rays.It is suggested

  18. Atividade alelopática de substâncias químicas isoladas do Capim-Marandu e suas variações em função do pH Allelopathic activity of chemical substances isolated from Brachiaria brizantha cv. Marandu and their variations in function of pH

    Directory of Open Access Journals (Sweden)

    L.S. Santos

    2008-01-01

    Full Text Available Este trabalho teve por objetivos isolar, identificar e caracterizar a atividade alelopática de substâncias químicas produzidas pela Brachiaria brizantha cv. Marandu e determinar as variações na atividade dessas substâncias em função da variação do pH da solução. A atividade alelopática foi realizada em bioensaios de germinação e desenvolvimento da radícula e do hipocótilo, utilizando as plantas daninhas malícia (Mimosa pudica e mata-pasto (Senna obtusifolia como receptoras. Os efeitos do pH foram analisados na faixa de 3,0 a 9,0. Os triterpenos pentacíclicos friedelina e epifriedelinol isolados da parte aérea de B. brizantha apresentaram baixa atividade inibitória na germinação de sementes e no desenvolvimento da radícula e do hipocótilo das duas plantas daninhas. As duas substâncias apresentaram comportamento diferenciado em relação à variação do pH da solução, com inibições mais marcantes em relação à planta daninha mata-pasto.This work aimed to isolate, identify and determine the allelopathic activity of the chemical substances produced by Brachiaria brizantha cv. Marandu and to verify the effects of the pH in the solution on the activity of these compounds. The allelopathic activity was evaluated based on germination bioassays and radicle and hypocotyl growth using the species 'malícia' (Mimosa pudica and 'mata-pasto' (Senna obtusifolia as receptors. The effect of pH was analyzed in a range from 3.0 to 9.0. The pentacyclic triterpenes friedelin and epifriefelinol isolated from the shoots of B. brizantha showed a low inhibitory activity against seed germination and radicle and hypocotyl growth of the two receptor plants evaluated. The pentacyclic triterpenes friedelin and epifrifelinol presented differentiated behaviors in relation to the pH variation in the solution, with stronger inhibition activity against the weed 'mata-pasto'.

  19. The effect of perspective on presence and space perception

    NARCIS (Netherlands)

    Ling, Y.; Nefs, H.T.; Brinkman, W.P.; Qu, C.; Heynderickx, I.E.J.

    2013-01-01

    In this paper we report two experiments in which the effect of perspective projection on presence and space perception was investigated. In Experiment 1, participants were asked to score a presence questionnaire when looking at a virtual classroom. We manipulated the vantage point, the viewing mode

  20. Presence and its absences. The 17th century gallery picture

    DEFF Research Database (Denmark)

    Bogh, Mikkel

    A discussion of how pictures made specifically for the gallery viewer in the 17th century produce certain kinds of presence in order to catch attention......A discussion of how pictures made specifically for the gallery viewer in the 17th century produce certain kinds of presence in order to catch attention...

  1. Culture matters : a study on presence in an interactive movie

    NARCIS (Netherlands)

    Hu, J.; Bartneck, C.

    2008-01-01

    A cross cultural study was conducted to test the influences of different cultural backgrounds on the user's presence experience in interacting with a distributed interactive movie. The effects of embodied interaction on presence were also investigated because embodiment is often used to enrich the

  2. Online Interactions and Social Presence in Online Learning

    Science.gov (United States)

    Lee, Sang Joon; Huang, Kun

    2018-01-01

    The community of inquiry framework identified three essential elements of cognitive, social, and teaching presences for a successful online learning experience. Among them, social presence is key for developing personal relationships and enhancing collaboration and critical discourse in online courses. This study examined whether providing more…

  3. Presence capture cameras - a new challenge to the image quality

    Science.gov (United States)

    Peltoketo, Veli-Tapani

    2016-04-01

    Commercial presence capture cameras are coming to the markets and a new era of visual entertainment starts to get its shape. Since the true presence capturing is still a very new technology, the real technical solutions are just passed a prototyping phase and they vary a lot. Presence capture cameras have still the same quality issues to tackle as previous phases of digital imaging but also numerous new ones. This work concentrates to the quality challenges of presence capture cameras. A camera system which can record 3D audio-visual reality as it is has to have several camera modules, several microphones and especially technology which can synchronize output of several sources to a seamless and smooth virtual reality experience. Several traditional quality features are still valid in presence capture cameras. Features like color fidelity, noise removal, resolution and dynamic range create the base of virtual reality stream quality. However, co-operation of several cameras brings a new dimension for these quality factors. Also new quality features can be validated. For example, how the camera streams should be stitched together with 3D experience without noticeable errors and how to validate the stitching? The work describes quality factors which are still valid in the presence capture cameras and defines the importance of those. Moreover, new challenges of presence capture cameras are investigated in image and video quality point of view. The work contains considerations how well current measurement methods can be used in presence capture cameras.

  4. Effect of plant cover on presence of Black Francolin (Francolinus ...

    African Journals Online (AJOL)

    STORAGESEVER

    2010-06-21

    Jun 21, 2010 ... factors threatening the populations of these birds in Khouzestan Province, southwestern Iran. Using plot sampling, this study aims to investigate different vegetative factors including plant species, percentage of species presence and dominant plant cover height on francolin presence. Sampling was.

  5. Privacy implications of presence sharing in mobile messaging applications

    NARCIS (Netherlands)

    Buchenscheit, Andreas; Könings, Bastian; Neubert, Andreas; Schaub, Florian; Schneider, Matthias; Kargl, Frank

    2014-01-01

    Mobile messaging applications, such as WhatsApp, provide a free alternative for mobile texting on smartphones. Mobile messengers typically also share presence information about users to indicate when a user is online. We investigated the privacy implications of such presence updates, using WhatsApp

  6. The final outcome of dissipative collapse in the presence of

    Indian Academy of Sciences (India)

    in the gravitational collapse of conformally flat, radiating spheres. ... Comprehensive studies of static fluid spheres in the presence of a cosmological constant have led .... tions with isotropic pressures in the presence of heat flux and cosmological constant ..... radiation from the stellar surface reaches our observer at infinity.

  7. Hidden Markov model for improved ultrasound-based presence detection

    NARCIS (Netherlands)

    Jaramillo Garcia, P.A.; Linnartz, J.P.M.G.

    2015-01-01

    Adaptive lighting systems typically use a presence detector to save energy by switching off lights in unoccupied rooms. However, it is highly annoying when lights are erroneously turned off while a user is present (false negative, FN). This paper focuses on the estimation of presence, using a Hidden

  8. Gender Gaps and the Presence and Profitability of College Football.

    Science.gov (United States)

    Rishe, Patrick James

    1999-01-01

    Analyzes data from the 1995-96 academic year for schools that compete at the Division I level of college athletics to determine the influence of the presence and profitability of football on female athletes in terms of funding and opportunity. Reveals that presence and profitability, as well as regional and ethnic considerations, influence…

  9. Presence in International Organisms: A Policy for a Collective Challenge

    Directory of Open Access Journals (Sweden)

    Manuel Montobbio

    2006-01-01

    Full Text Available What does the presence of Spaniards in international organisations signify and entail? Why, for what, and how should this be promoted? In order to answer such questions, the author analyses the meaning and implications of this presence in a globalised world in which a commitment to effective multilateralism entails a commitment to the international organisms as forums for and actors in global governance, and their presence in our societies and lives. This means both the promoting of Spanish presence in the administrations inwhich the proposals are formed which embody the general interest of the international organisations, like the multilateralisation of Spanish society. For this reason, in the framework of its multilateral policy, Spain is currently developing a policy of promoting the presence of Spaniards in international organisations in the areas of information, training, promotion and incentives, the outlines and results of which are described in this article.

  10. Escudos epidérmicos supernumerários e variação na carapaça na tartaruga-tigre-d’água, Trachemys dorbigni (Testudines, Emydidae)

    OpenAIRE

    Bujes, Clovis de Souza; Verrastro Viñas, Laura

    2007-01-01

    The epidermal plates of the carapace and plastron of 51 adults (38 females and 13 males), 07 immature individuals, and 46 hatchlings of the freshwater turtle Trachemys dorbigni (Durémil & Bibron, 1835), originated from the delta of Rio Jacuí region, Rio Grande do Sul state, Brazil, were examined. The results showed that 7.7% of males, 10.52% of females, 14.28% of immature individuals, and 6.52% of the hatchlings presented a kind of anomaly on the shell, as well as a presence of supernumerary ...

  11. Florística e variação espaço-temporal de macrófitas aquáticas em reservatórios de abastecimento da Bacia do Rio Iguaçu, PR, Brasil

    OpenAIRE

    Silva, Suelen Cristina Alves da

    2013-01-01

    Resumo: Macrófitas aquáticas são estruturadoras do ecosistema proporcionando a ciclagem de nutrientes na coluna d'água, além de promover abrigo à fauna aquática. Contudo, a poluição aquática pode promover a intensa proliferação dessas plantas causando efeitos deletérios ao meio aquático além de encarecer os custos com manutenção de turbinas e grades de segurança em reservatórios. O objetivo do presente trabalho foi realizar um levantamento florístico e estudo ecológico da variação espaço-temp...

  12. Demanda energética e eficiência da distribuição de sementes de milho sob variação de velocidade e condição de solo Seeder energetic demand and distribution efficiency of corn seeds under speed variation and soil condition

    Directory of Open Access Journals (Sweden)

    Denise Mahl

    2004-04-01

    Full Text Available O trabalho teve o objetivo de avaliar a demanda energética e a eficiência da distribuição de sementes de uma semeadora-adubadora para semeadura direta, submetida à variação de velocidade e condições de solo, na semeadura da cultura do milho. O estudo foi desenvolvido em um Nitossolo Vermelho distrófico, na Fazenda Experimental Lageado, no município de Botucatu - SP. O delineamento experimental foi em blocos casualizados, com oito repetições, combinando-se três velocidades de deslocamento (4,4; 6,1 e 8,1 km h-1 e duas condições de solo (solo manejado sob sistema de plantio direto há cinco anos e solo preparado com escarificador há 18 meses. Avaliaram-se a força de tração, a potência na barra de tração, o consumo de combustível, a capacidade de campo efetiva, a distribuição longitudinal de plantas, o coeficiente de variação, o índice de precisão e o número de plantas por hectare (estande inicial. Os resultados revelaram que, aumentando-se a velocidade de 4,4 para 8,1 km h-1, consegue-se aumentar em 86% a capacidade operacional, com incremento de 96% na demanda de potência na barra de tração e redução de 26% no consumo operacional de combustível. A maior velocidade (8,1 km h-1 proporcionou menor porcentual de espaçamentos normais e aumento no porcentual de espaçamentos múltiplos e falhos, maior coeficiente de variação e pior índice de precisão. A variação da velocidade não interferiu no número de plantas por hectare.This work evaluated the energetic demand and distribution efficiency of corn seeds in a no-till seeder when submitted to travel speed and soil condition variation. The study was developed in a soil classified as Ultissoil, at Fazenda Experimental Lageado, Botucatu Country, São Paulo State, Brazil. The experimental design was in a randomized block with eight repetitions, being the treatments a combination of three displacement speeds (4.4; 6.1 and 8.1 km h-1 and two soil conditions (soil

  13. Efetividade do aconselhamento nutricional da Pastoral da Criança sobre a variação de hemoglobina entre menores de seis anos de idade Effectiveness of nutritional counseling provided by the Children's Mission on hemoglobin variation in under-six children

    Directory of Open Access Journals (Sweden)

    Iná dos Santos

    2005-02-01

    Full Text Available Para avaliar a efetividade do treinamento das líderes da Pastoral da Criança em aconselhamento nutricional sobre a variação da hemoglobina entre menores de seis anos, foi realizada uma intervenção comunitária. Por sorteio, uma das duas áreas de ação da Pastoral da Criança em Pelotas, Rio Grande do Sul, Brasil, foi selecionada e as líderes treinadas (Grupo Intervenção. A outra área constituiu o Grupo Controle. Após consentimento, a mãe foi entrevistada sobre a família, saúde e alimentação da criança. A hemoglobina foi medida com fotômetro portátil ao ingressar no estudo e após seis meses. O desfecho foi a variação da hemoglobina, da primeira para a segunda medida. Ingressaram 183 crianças intervenção e 179 crianças controle, comparáveis quanto ao sexo, idade, características ao nascer, aporte de ferro e nível médio de hemoglobina. Na análise ajustada, a variação no grupo intervenção foi 0,18 ± 0,27g/dl maior do que no controle. Embora a diferença entre os grupos não fosse estatisticamente significativa, a variação foi positiva no grupo intervenção e negativa no grupo controle, sugerindo benefício do treinamento.A community intervention was conducted to evaluate the effectiveness of leadership training in the Children's Mission (of the Brazilian Catholic Church for providing nutritional counseling on hemoglobin variation in children less than six years of age. Two areas of activity by the Children's Mission in Pelotas, Rio Grande do Sul State, Brazil, were randomly selected and the leaders in one were trained (intervention group. The other area constituted the control group. After providing consent, mothers were interviewed concerning the family and the child's health and eating. Hemoglobin was measured with a portable photometer upon entry into the study and at six months. The outcome variable was hemoglobin variation between the first and second measurements. The study included 183 intervention

  14. Comparação da reposição volêmica aguda guiada por variação de pressão de pulso e por metas convencionais  de ressuscitação em modelo suíno de choque hemorrágico com endotoxemia

    OpenAIRE

    Jessica Noel-Morgan

    2012-01-01

    Introdução: A fluidoterapia é o tratamento de primeira linha para pacientes em choque hemorrágico ou choque séptico para restauração do volume circulante e da perfusão tecidual, mas diversas questões relacionadas a este tópico permanecem em debate, particularmente em relação às metas de ressuscitação representadas por variáveis fisiológicas a serem atingidas. A variação de pressão de pulso (VPP) já foi proposta como índice confiável para predição de fluido-responsividade em pacientes sob vent...

  15. Seasonal variation of phenolic content in galled and non-galled tissues of Calliandra brevipes Benth (Fabaceae: Mimosoidae Variação sazonal do conteúdo fenólico em tecidos galhados e não-galhados de Calliandra brevipes Benth (Fabaceae: Mimosoidae

    Directory of Open Access Journals (Sweden)

    Michelle de Lima Detoni

    2011-09-01

    Full Text Available Two species, Tanaostigmodes ringueleti and T. mecanga, induce distinct galls on Calliandra brevipes Benth (Fabaceae: Mimosoidae, a globose and a fusiform gall morphotype. Seasonal changes of phenolic content in the tissues of the two distinct galls were compared to those of non-galled leaves and stems of the host plants over one year. The variation in the phenolic content profiles was similar in both non-galled and galled tissues, and was primarily associated with changes in the levels of rainfall, indicating a direct response to hydric stress. In periods of drastic changes in water precipitation, the alterations were significantly higher in non-galled than in galled tissues suggesting that the gall inducers might limit the variation in the phenolic concentration for their own benefit.Duas espécies, Tanaostigmodes ringueleti e T. mecanga, induzem galhas distintas em Calliandra brevipes Benth (Fabaceae: Mimosoidae, um morfotipo globoso e um fusiforme. Mudanças sazonais no conteúdo fenólico nos tecidos das duas galhas foram comparadas àquelas de folha e caule não galhados das plantas hospedeiras por um ano. A variação no perfil de conteúdo fenólico foi similar em tecidos galhados e não galhados, sendo associada primariamente às mudanças nos níveis de chuva, constituindo uma resposta direta ao estresse hídrico. Nos períodos de mudanças drásticas na precipitação de água, as alterações foram significativamente maiores em tecido não galhados do que em tecidos galhados, sugerindo que os galhadores estariam limitando a variação do conteúdo fenólico em seu próprio benefício.

  16. The concept of presence in group psychotherapy: an operational definition.

    Science.gov (United States)

    Crane-Okada, Rebecca

    2012-07-01

    The paper aims to operationally define the concept of presence, as developed and exhibited by the therapist leading a psychotherapy group, and illustrated with case examples. A group therapist, who addresses tangible, basic group survival needs, while integrating knowledge of psychotherapeutic processes, authentic and effective interpersonal communications, and genuine concern for individual members and the group as a whole, is best situated to enact presence in the context of group psychotherapy. Establishing presence can be achieved in a systematic way with an understanding of the meaning of being present at each step in the development of the group psychotherapeutic process. © 2011 Wiley Periodicals, Inc.

  17. Research issues in implementing remote presence in teleoperator control

    Science.gov (United States)

    Corker, K.; Mishkin, A. H.; Lyman, J.

    1981-01-01

    The concept of remote presence in telemanipulation is presented. A conceptual design of a prototype teleoperator system incorporating remote presence is described. The design is presented in functional terms, sensor, display, and control subsystem. An intermediate environment, in which the human operator is made to feel present, is explicated. The intermediate environment differs from the task environment due to the quantity and type of information presented to an operator and due to scaling factors protecting the operator from the hazards of the task environment. Potential benefits of remote presence systems, both for manipulation and for the study of human cognition and preception are discussed.

  18. Presence and biofeedback in first-person perspective computer games

    DEFF Research Database (Denmark)

    Grimshaw-Aagaard, Mark Nicholas

    2019-01-01

    . Following the line taken by presence theorists, I differentiate between immersion, an objective measure such that computer game technology can be less or more immersive, and presence, a subjective, human response to that technology. The third section looks at current possibilities for biofeedback...... in relation to sound design for first-person perspective computer games; in line with the first section, biofeedback devices are treated as an immersive technology. I close the chapter by suggesting ways in which sound design in such games might make use of biofeedback to enhance the perception of presence...

  19. A Note on optimal estimation in the presence of outliers

    Directory of Open Access Journals (Sweden)

    John N. Haddad

    2017-06-01

    Full Text Available Haddad, J. 2017. A Note on optimal estimation in the presence of outliers. Lebanese Science Journal, 18(1: 136-141. The basic estimation problem of the mean and standard deviation of a random normal process in the presence of an outlying observation is considered. The value of the outlier is taken as a constraint imposed on the maximization problem of the log likelihood. It is shown that the optimal solution of the maximization problem exists and expressions for the estimates are given. Applications to estimation in the presence of outliers and outlier detection are discussed and illustrated through a simulation study and analysis of trade data

  20. Micropogonias furnieri (Desmarest, 1823: estudo quali-quantitativo da variação ontogenética do padrão eletroforético de proteínas gerais do cristalino Micropogonias furnieri (Desmarest, 1823 quali-quantitative studies on ontogenetic variation of the electrophoretic patterns of eye-lens proteins

    Directory of Open Access Journals (Sweden)

    Anna Emília Amato de Moraes Vazzoler

    1985-01-01

    Full Text Available Foram analisadas as possíveis variações do padrão eletroforético de proteínas gerais do cristalino de Micropogonias furnieri (Desmarest, 1823, em função do desenvolvimento ontogenetico, do sexo e do ciclo de maturaçao das gonadas, com vistas a sua utilizaçao em estudos populacionais. Foram analisados, por eletroforese em acetato de celulose, cristalinos de 546 exemplares com comprimento total entre 98 e 710 mm, coletados no período de fevereiro de 1975 a fevereiro de 1976, na costa sudeste do Brasil (23ºS - 29ºS, area ocupada pela populaçao I da espécie (Vazzoler, 1971. 0 padrao geral obtido foi dividido em 4 conjuntos com 8 frações protéicas. Para indivíduos de mesmo tamanho nao foram constatadas diferenças entre os padrões do cristalino esquerdo e direito, entre padrões de machos e fêmeas e entre padrões de exemplares com gonadas em diferentes estádios de maturidade. Entretanto, ocorrem acentuadas variações quali-quantitativas relacionadas ao desenvolvimento ontogenêtico. O conjunto I sofre marcada queda em sua concentração relativa, enquanto os conjuntos II, III e IV apresentam incremento. 0 conjunto II sofre variações qualitativas, apresentando 2 frações para indivíduos jovens (até 300-350 mm e apenas uma nos adultos. As frações I, II-l, II-2, III-3 e IV-2 apresentam variações mais acentuadas até a classe de 300-350 mm; ocorre estabilizaçao da concentração relativa das frações II-1, II-2 e III-3 a partir de 300-350 mm, e da I e IV-2 a partir de 450-500 mm. As frações III-1, III-2 e IV-1 apresentam pequenas variações, sendo praticamente constantes. Desse modo, para utilizaçao dos padrões eletroforêticos de proteínas dos cristalinos como marcadores genêtico-bioquímicos em estudos sobre variações intra-específicas, algumas estratégias devem ser consideradas, de acordo com os objetivos do estudo: a - comparar apenas as frações que se mostraram estáveis durante o desenvolvimento (III

  1. The presence of a primary male caregiver affects children's ...

    African Journals Online (AJOL)

    caregiver has an influence, direct or indirect, on children's language skills. Keywords: ... the presence/absence of a father figure on language development were mainly conducted in ... centres via the classroom teachers or day mothers.

  2. Parental presence within households and the impact of antiretroviral ...

    African Journals Online (AJOL)

    often return to the parental home to access care and support, primarily ... contact with children, even when they do not reside in the ... remained low in all specifications. ... CI = confidence interval. ... maternal presence, fathers were significantly.

  3. Successful total knee arthroplasty in the presence of sporotrichal arthritis.

    NARCIS (Netherlands)

    Koeter, S.; Jackson, R.W.

    2006-01-01

    Articular sporotrichosis, a chronic granulomatous fungal infection, is a rare entity but when present may lead to significant joint destruction. Severe knee arthrosis due to sporotrichal arthritis has traditionally been treated with arthrodesis. Total knee arthroplasty in the presence of

  4. South African women writings: Tracing the journey of their presence ...

    African Journals Online (AJOL)

    South African women writings: Tracing the journey of their presence, development, expansion and self-expression as a form of ... Gender and Behaviour ... This in itself was a feminist struggle to change societal perceptions and stereotypes.

  5. Dextran solution optical activity in Tb (III) ion presence

    International Nuclear Information System (INIS)

    Vasconcellos, Sandra S.; Rodrigues, J.F.; Faljoni-Alario, A.

    1984-01-01

    Optical activity studies of aqueous solutions of dextrana in presence of Tb (III) or without it shows the complex with the hidroxyl groups of C 2 and C 3 of monomeric unit participation is formed. (L.M.J.) [pt

  6. Determination of bromoxynil and ioxynil in the presence of ...

    African Journals Online (AJOL)

    SLM) technique for the determination of phenolic nitrile herbicides in presence of carbamates in river water samples was investigated. The uncharged herbicide molecules from the flowing aqueous solution diffuse through an immobilized ...

  7. Gridded Species Distribution, Version 1: Global Amphibians Presence Grids

    Data.gov (United States)

    National Aeronautics and Space Administration — The Global Amphibians Presence Grids of the Gridded Species Distribution, Version 1 is a reclassified version of the original grids of amphibian species distribution...

  8. Forward Military Presence: A Matter of Strategic Culture

    National Research Council Canada - National Science Library

    Basham, Steven L

    2007-01-01

    .... The research within this paper offers for consideration the possibility that United States policy toward forward military presence is guided by a developing strategic culture based upon an underlying...

  9. Selective response of dopamine in the presence of ascorbic acid ...

    African Journals Online (AJOL)

    Selective response of dopamine in the presence of ascorbic acid and uric acid at gold nanoparticles and multi-walled carbon nanotubes grafted with ethylene diamine tetraacetic acid modified electrode.

  10. Oral Candidiasis: A Tool For The Detection Of Presence And ...

    African Journals Online (AJOL)

    Oral Candidiasis: A Tool For The Detection Of Presence And Progression Of Hiv Infection In Children In ... Open Access DOWNLOAD FULL TEXT ... Oral cavity is an important and frequently undervalued source of diagnostic and prognostic ...

  11. Ion Acoustic Waves in the Presence of Electron Plasma Waves

    DEFF Research Database (Denmark)

    Michelsen, Poul; Pécseli, Hans; Juul Rasmussen, Jens

    1977-01-01

    Long-wavelength ion acoustic waves in the presence of propagating short-wavelength electron plasma waves are examined. The influence of the high frequency oscillations is to decrease the phase velocity and the damping distance of the ion wave.......Long-wavelength ion acoustic waves in the presence of propagating short-wavelength electron plasma waves are examined. The influence of the high frequency oscillations is to decrease the phase velocity and the damping distance of the ion wave....

  12. The role of presence in virtual reality exposure therapy

    OpenAIRE

    Price, Matthew; Anderson, Page

    2006-01-01

    A growing body of literature suggests that virtual reality is a successful tool for exposure therapy in the treatment of anxiety disorders. Virtual reality (VR) researchers posit the construct of presence, defined as the interpretation of an artificial stimulus as if it were real, to be a presumed factor that enables anxiety to be felt during virtual reality exposure therapy (VRE). However, a handful of empirical studies on the relation between presence and anxiety in VRE have yielded mixed f...

  13. Radionuclide presence in the atmosphere and hydrosphere of Costa Rica

    International Nuclear Information System (INIS)

    Loria Meneses, L. G.; Salazar, M. A.; Jimenez, R.; Mora, P.

    2000-01-01

    The study established a light presence of isotopes of origin anthropogenic and in turn the same ones show the presence of natural radioactive isotopes, although the activities specify measures of these isotopes they are among the values world averages. The country was divided according to the three main slopes to develop the analysis of the diverse ones our, by means of technical analytic: the spectrometry gamma and fluorescence of rays X [es

  14. Using presence to evaluate an augmented reality location aware game

    OpenAIRE

    McCall, Roderick; Wetzel, Richard; Löschner, Johannes; Braun, Anne-Kathrin

    2011-01-01

    Location-aware augmented reality games provide players with a rich and potentially unlimited range of interaction possibilities. In this paper, a study is described which uses a number of measurement techniques including questionnaires, direct observation, semi-structured interviews and video analysis to measure player’s sense of presence. The paper points to the importance of the availability of actions within augmented reality games and how this shapes their sense of presence. The findings ...

  15. Transboundary Extraction of Groundwater in the Presence of Hydraulic Fracturing

    OpenAIRE

    Poudel, Biswo N.; Paudel, Krishna P.; Zilberman, David

    2013-01-01

    We studied transboundary ground water management problems in the presence of hydraulic fracturing (fracking). We found that the presence of risk suggests a need to exercise caution in fracking. We also found that a cooperative outcome implies the decrease in fracking and the increase in steady state survival rate of groundwater. However, water extraction rates remained the same in both cooperative and noncooperative solutions. We also argue that a Pigouvian type tax could be imposed on the na...

  16. Casimir force in the presence of a medium

    International Nuclear Information System (INIS)

    Kheirandish, Fardin; Soltani, Morteza; Sarabadani, Jalal

    2010-01-01

    We investigate the Casimir effect in the presence of a medium by quantizing the electromagnetic field in the presence of a magnetodielectric medium using the path-integral technique. For a given medium with definite electric and magnetic susceptibilities, explicit expressions for the Casimir force are obtained. The Lifshitz formula is recovered and in the absence of a medium the results tend to the original Casimir force between two conducting parallel plates immersed in the quantum electromagnetic vacuum.

  17. Social Injustice From the Presence of the Bauxite Mining Companies

    OpenAIRE

    Fatmawati, Fatmawati; Seko, Salfius

    2016-01-01

    This study aims to examine the forms of social injustice by the presence of mining companies and local residents in the Tayan Hilir, Sanggau. This study used a qualitative approach accomplished through a descriptive method, and which was then analyzed using qualitative analysis to describe the form of social injustice for society by the presence of mining companies. Results of the study explained that point on begins the social injustice originated from government policies that tend to favor ...

  18. Presence of Beryllium (Be) in urban soils: human health risk

    Energy Technology Data Exchange (ETDEWEB)

    Pena, A.; Gonzalez, M. J.; Lobo, M. C.

    2009-07-01

    Berylium (Be) is, together with As, Cd, Hg, Pb and Ti, one of the trace elements more toxic for human being (Vaessen) and Szteke, 2000; Yaman and Avci, 2006), but in spite of the exponential increment of its applications during the last decades, surprisingly there isn't hardly information about its presence and environmental distribution. The aim of this work is to evaluate the presence of Beryllium in urban soils in Alcala de Henares, (Madrid Spain).

  19. Spatial Downscaling of Alien Species Presences Using Machine Learning

    Directory of Open Access Journals (Sweden)

    Ioannis N. Daliakopoulos

    2017-07-01

    Full Text Available Spatially explicit assessments of alien species environmental and socio-economic impacts, and subsequent management interventions for their mitigation, require large scale, high-resolution data on species presence distribution. However, these data are often unavailable. This paper presents a method that relies on Random Forest (RF models to distribute alien species presence counts at a finer resolution grid, thus achieving spatial downscaling. A bootstrapping scheme is designed to account for sub-setting uncertainty, and subsets are used to train a sufficiently large number of RF models. RF results are processed to estimate variable importance and model performance. The method is tested with an ~8 × 8 km2 grid containing floral alien species presence and several potentially exploratory indices of climatic, habitat, land use, and soil property covariates for the Mediterranean island of Crete, Greece. Alien species presence is aggregated at 16 × 16 km2 and used as a predictor of presence at the original resolution, thus simulating spatial downscaling. Uncertainty assessment of the spatial downscaling of alien species' occurrences was also performed and true/false presences and absences were quantified. The approach is promising for downscaling alien species datasets of larger spatial scale but coarse resolution, where the underlying environmental information is available at a finer resolution. Furthermore, the RF architecture allows for tuning toward operationally optimal sensitivity and specificity, thus providing a decision support tool for designing a resource efficient alien species census.

  20. Presence of third molars in orthodontic patients from northern Greece

    Directory of Open Access Journals (Sweden)

    Barka G

    2012-05-01

    Full Text Available Georgia Barka,1 Georgios Tretiakov,1 Theodosios Theodosiou,2 Ioulia Ioannidou-Marathiotou31School of Dentistry, 2Biostatistics, Department of Informatics, School of Natural Sciences, 3Department of Orthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, GreeceObjective: The purpose of the present study was to investigate the frequency of presence of third molar teeth and their distribution in each jaw and each side, according to sex, in a group of orthodontic patients with permanent dentition from northern Greece.Methods: The sample included panoramic radiographs from 220 patients with permanent dentition (mean age 13.62 ± 1.81. The Χ2 test was used to assess the relationships between the variables, and the Fisher's exact test was used in cases where the expected frequencies in each cell were <5.Results: The frequency of third molar presence was 79.1%, and 20.9% was the frequency of third molar agenesis. Intersexual differences in the number of third molars was not statistically significant. There was a correlation between the distribution of third molars on the right and the left side (Fisher's exact test = 100.788; P = 0. The two sides showed the same tendency toward the presence or absence of third molars. A correlation was also found between the distribution of maxillary and mandibular third molars (Fisher's exact test = 24.372; P = 0. In each jaw, the presence or absence of third molars was highly related to the number of third molars found in the other jaw.Conclusion: The present results showed that in this orthodontic group of northern Greek patients, presence accounted for 79.1% and agenesis for 20.9%. No significant difference was found between the frequencies of third molar presence on the left and right sides in either the maxilla or mandible.Keywords: third molars, presence, orthodontic population, Greeks

  1. Electrodeposition of quaternary alloys in the presence of magnetic field

    Science.gov (United States)

    2010-01-01

    Electrodeposition of Ni-Co-Fe-Zn alloys was done in a chloride ion solution with the presence and absence of a Permanent Parallel Magnetic Field (PPMF). The PPMF was applied parallel to the cathode surface. The deposition profile was monitored chronoamperometrically. It was found that the electrodeposition current was enhanced in the presence of PPMF (9 T) compared to without PPMF. The percentage of current enhancement (Γ%) was increased in the presence of PPMF, with results of Γ% = 11.9%, 16.7% and 18.5% at -1.1, -1.2 and -1.3 V respectively for a 2400 sec duration. In chronoamperometry, the Composition Reference Line (CRL) for Ni was around 57%, although the nobler metals (i.e. Ni, Co) showed anomalous behaviour in the presence of Zn and Fe. The anomalous behaviour of the Ni-Co-Fe-Zn electrodeposition was shown by the Energy Dispersive X-Ray (EDX) results. From Atomic Force Microscopy (AFM) measurements, it was found that the surface roughness of the Ni-Co-Fe-Zn alloy films decreased in the presence of a PPMF. PMID:20604934

  2. Spatial Downscaling of Alien Species Presences using Machine Learning

    Science.gov (United States)

    Daliakopoulos, Ioannis N.; Katsanevakis, Stelios; Moustakas, Aristides

    2017-07-01

    Large scale, high-resolution data on alien species distributions are essential for spatially explicit assessments of their environmental and socio-economic impacts, and management interventions for mitigation. However, these data are often unavailable. This paper presents a method that relies on Random Forest (RF) models to distribute alien species presence counts at a finer resolution grid, thus achieving spatial downscaling. A sufficiently large number of RF models are trained using random subsets of the dataset as predictors, in a bootstrapping approach to account for the uncertainty introduced by the subset selection. The method is tested with an approximately 8×8 km2 grid containing floral alien species presence and several indices of climatic, habitat, land use covariates for the Mediterranean island of Crete, Greece. Alien species presence is aggregated at 16×16 km2 and used as a predictor of presence at the original resolution, thus simulating spatial downscaling. Potential explanatory variables included habitat types, land cover richness, endemic species richness, soil type, temperature, precipitation, and freshwater availability. Uncertainty assessment of the spatial downscaling of alien species’ occurrences was also performed and true/false presences and absences were quantified. The approach is promising for downscaling alien species datasets of larger spatial scale but coarse resolution, where the underlying environmental information is available at a finer resolution than the alien species data. Furthermore, the RF architecture allows for tuning towards operationally optimal sensitivity and specificity, thus providing a decision support tool for designing a resource efficient alien species census.

  3. Comparison of Student and Instructor Perceptions of Social Presence

    Directory of Open Access Journals (Sweden)

    Kathleen Mathieson

    2014-05-01

    Full Text Available As enrollment in online courses continues to grow and online education is increasingly recognized as an established instructional mode, the unique challenges posed by this learning environment should be addressed. A primary challenge for virtual educators is developing social presence such that participants feel a sense of human connection with each other. Accomplishing this within learning management systems (LMS that are often restrictive can be difficult. Prior research has established a relationship between student perceptions of social presence and satisfaction, but little research has included perceptions of instructors. This study compares student and instructor perceptions of social presence and the importance placed on social connections. While students and instructors reported high levels of social presence, students reported significantly lower levels than instructors. In particular, students found the LMS more impersonal than instructors and were less comfortable participating in LMS activities than instructors. Students had less desire for social connections with other students and instructors, and reported having less time available for such connections. Strategies to facilitate social presence, including offering social networking opportunities outside the LMS, are discussed in light of these differences in perceptions between students and instructors.

  4. Yogurt fermentation in the presence of starch-lipid composite.

    Science.gov (United States)

    Singh, M; Kim, S

    2009-03-01

    The fermentation of yogurt in the presence of 0.5%, 1.0%, 1.5%, and 2.0% starch-lipid composite (SLC) was investigated. The pH, viscosity, and morphology of the mix were monitored during the fermentation process. The rate of drop in pH with time during incubation was not affected by the addition of SLC. However, it was found that the presence of SLC caused faster aggregation, which was clearly evidenced by the viscosity variation during the process of fermentation. An examination of the morphologies confirmed that aggregation occurred earlier in the presence of SLC and SLC did not form phase-separated domains. This study concludes that SLC would serve as a good additive (fat replacer and stabilizer) for the production of yogurt.

  5. Robust image authentication in the presence of noise

    CERN Document Server

    2015-01-01

    This book addresses the problems that hinder image authentication in the presence of noise. It considers the advantages and disadvantages of existing algorithms for image authentication and shows new approaches and solutions for robust image authentication. The state of the art algorithms are compared and, furthermore, innovative approaches and algorithms are introduced. The introduced algorithms are applied to improve image authentication, watermarking and biometry.    Aside from presenting new directions and algorithms for robust image authentication in the presence of noise, as well as image correction, this book also:   Provides an overview of the state of the art algorithms for image authentication in the presence of noise and modifications, as well as a comparison of these algorithms, Presents novel algorithms for robust image authentication, whereby the image is tried to be corrected and authenticated, Examines different views for the solution of problems connected to image authentication in the pre...

  6. On the Use of Presence Measurements to Evaluate Computer Games

    DEFF Research Database (Denmark)

    Nordahl, Rolf; Korsgaard, Dannie

    2008-01-01

    As the game industry expresses a growing demand for effective evaluation methods, it is worth investigating if the commonly used questionnaires can be replaced by alternative ways of measuring user experience in interactive environments. This paper describes an experiment where an existing presence...... measurement method is modified for use in computer game development. 39 subjects were part of the experiment, which was designed to test applicability of the adapted presence measuring method. Besides playing a game prototype, test participants were asked to press a button when a visual signal, triggered...... by an in-game event, would appear on the screen in the periphery of sight. Noting how strong the signal was is assumed to infer how strong the stimuli had to be in order to break the immersive presence. The results indicated that the adapted method with observations from the test is more useful, than...

  7. Análise da variação dos valores da rotação medial conforme a posição da diáfise do úmero Analysis on the variation of medial rotation values according to the position of the humeral diaphysis

    Directory of Open Access Journals (Sweden)

    Alberto Naoki Miyazaki

    2012-01-01

    Full Text Available OBJETIVO: Analisar a validade da medida de rotação medial (RM do ombro pelos níveis vertebrais conforme a variação da posição da diáfise do úmero, testando o bigoniômetro como novo instrumental de aferição. MÉTODOS: Foram avaliados, prospectivamente, 140 ombros (70 pacientes que tinham limitação da RM do ombro unilateral. Avaliou-se, por meio da escala visual, o nível vertebral e correlacionou-se com o ângulo obtido conforme a posição da diáfise do úmero utilizando o bigoniômetro desenvolvido com a Engenharia Mecânica do Mackenzie. RESULTADOS: O nível vertebral máximo alcançado na RM do lado não acometido variou de T3 a T12, e para o lado acometido variou de T6 a trocânter. Já quando o membro acometido foi reposicionado em RM de acordo com os valores angulares do lado normal, 57,13% dos pacientes alcançaram níveis mais baixos entre sacro, glúteo e trocânter. Analisando o nível vertebral máximo alcançado e a variação entre o ângulo x (plano frontal: abdução e RM do ombro acometido e o ângulo x não acometido em RM, verificamos que quanto maior a angulação do eixo da diáfise menor a variação do nível vertebral alcançado. Avaliando a correlação linear entre as variáveis diferença do nível vertebral máximo alcançado e a variação do ângulo y (extensão e adução do ombro acometido e ângulo y não acometido em RM, verificamos que não há uma relação linear bem estabelecida entre estas variáveis. CONCLUSÃO: A medida da RM pelos níveis vertebrais não corresponde aos valores reais, pois varia conforme o posicionamento da diáfise do úmero.OBJECTIVE: To analyze the validity of measurements of shoulder medial rotation (MR of the shoulder, using vertebral levels, according to the variation in the position of the humeral diaphysis, and to test the bi-goniometer as a new measuring instrument. METHODS: 140 shoulders (70 patients were prospectively evaluated in cases presenting unilateral

  8. Variação sazonal na morfologia dos ductos eferentes distais em codorna doméstica mantida em cativeiro experimental Morphologic seasonal variability on the distal efferent ducts of domestic quail under experimental captive breeding

    Directory of Open Access Journals (Sweden)

    Antonio Marcos Orsi

    2008-09-01

    enlargement of the passageways, with similar results in summer and winter, and characteristic organelle development on the apical cytoplasm of P cells, allowing to conclude presence of active process of endocytosis. Autumn quiescence was marked by an enfolding pattern of all the tubular passageways, lacking of spermatozoa and small amount of heterogeneous material inside their luminal compartments, followed by presence of ultrastructural degenerative features in apical cytoplasm of P cells and C cells in DED passageways. Tubular features verified in DED during winter and summer were minor and similar to those described in spring. Summer and winter were respectively considered the recrudescent and regressive phases of the testis cycle in these species, based on the spermatogenesis cycle analysed in all the seasons of the year as well as on the base the morphologic features here found.

  9. Environmental predictors of ice seal presence in the Bering Sea.

    Science.gov (United States)

    Miksis-Olds, Jennifer L; Madden, Laura E

    2014-01-01

    Ice seals overwintering in the Bering Sea are challenged with foraging, finding mates, and maintaining breathing holes in a dark and ice covered environment. Due to the difficulty of studying these species in their natural environment, very little is known about how the seals navigate under ice. Here we identify specific environmental parameters, including components of the ambient background sound, that are predictive of ice seal presence in the Bering Sea. Multi-year mooring deployments provided synoptic time series of acoustic and oceanographic parameters from which environmental parameters predictive of species presence were identified through a series of mixed models. Ice cover and 10 kHz sound level were significant predictors of seal presence, with 40 kHz sound and prey presence (combined with ice cover) as potential predictors as well. Ice seal presence showed a strong positive correlation with ice cover and a negative association with 10 kHz environmental sound. On average, there was a 20-30 dB difference between sound levels during solid ice conditions compared to open water or melting conditions, providing a salient acoustic gradient between open water and solid ice conditions by which ice seals could orient. By constantly assessing the acoustic environment associated with the seasonal ice movement in the Bering Sea, it is possible that ice seals could utilize aspects of the soundscape to gauge their safe distance to open water or the ice edge by orienting in the direction of higher sound levels indicative of open water, especially in the frequency range above 1 kHz. In rapidly changing Arctic and sub-Arctic environments, the seasonal ice conditions and soundscapes are likely to change which may impact the ability of animals using ice presence and cues to successfully function during the winter breeding season.

  10. Shared presence in physician-patient communication: A graphic representation.

    Science.gov (United States)

    Ventres, William B; Frankel, Richard M

    2015-09-01

    Shared presence is a state of being in which physicians and patients enter into a deep sense of trust, respect, and knowing that facilitates healing. Communication between physicians and patients (and, in fact, all providers and recipients of health care) is the medium through which shared presence occurs, regardless of the presenting problem, time available, location of care, or clinical history of the patient. Conceptualizing how communication leads to shared presence has been a challenging task, however. Pathways of this process have been routinely lumped together as the biopsychosocial model or patient, person, and relationship-centered care--all deceptive in their simplicity but, in fact, highly complex--or reduced to descriptive explications of one constituent element (e.g., empathy). In this article, we reconcile these pathways and elements by presenting a graphic image for clinicians and teachers in medical education. This conceptual image serves as a framework to synthesize the vast literature on physician-patient communication. We place shared presence, the fundamental characteristic of effective clinical communication, at the center of our figure. Around this focal point, we locate four elemental factors that either contribute to or result from shared presence, including interpersonal skills, relational contexts, actions in clinical encounters, and healing outcomes. By visually presenting various known and emergent theories of physician-patient communication, outlining the flow of successful encounters between physicians and patients, and noting how such encounters can improve outcomes, physicians, other health care professionals, and medical educators can better grasp the complexity, richness, and potential for achieving shared presence with their patients. (c) 2015 APA, all rights reserved).

  11. Environmental predictors of ice seal presence in the Bering Sea.

    Directory of Open Access Journals (Sweden)

    Jennifer L Miksis-Olds

    Full Text Available Ice seals overwintering in the Bering Sea are challenged with foraging, finding mates, and maintaining breathing holes in a dark and ice covered environment. Due to the difficulty of studying these species in their natural environment, very little is known about how the seals navigate under ice. Here we identify specific environmental parameters, including components of the ambient background sound, that are predictive of ice seal presence in the Bering Sea. Multi-year mooring deployments provided synoptic time series of acoustic and oceanographic parameters from which environmental parameters predictive of species presence were identified through a series of mixed models. Ice cover and 10 kHz sound level were significant predictors of seal presence, with 40 kHz sound and prey presence (combined with ice cover as potential predictors as well. Ice seal presence showed a strong positive correlation with ice cover and a negative association with 10 kHz environmental sound. On average, there was a 20-30 dB difference between sound levels during solid ice conditions compared to open water or melting conditions, providing a salient acoustic gradient between open water and solid ice conditions by which ice seals could orient. By constantly assessing the acoustic environment associated with the seasonal ice movement in the Bering Sea, it is possible that ice seals could utilize aspects of the soundscape to gauge their safe distance to open water or the ice edge by orienting in the direction of higher sound levels indicative of open water, especially in the frequency range above 1 kHz. In rapidly changing Arctic and sub-Arctic environments, the seasonal ice conditions and soundscapes are likely to change which may impact the ability of animals using ice presence and cues to successfully function during the winter breeding season.

  12. Rethinking presence: a grounded theory of nurses and teleconsultation.

    Science.gov (United States)

    Barrett, David

    2017-10-01

    To develop a theory that offered an evidence-based insight into the use of teleconsultation by nurses. Teleconsultation is the use of video to facilitate real-time, remote interaction between healthcare practitioners and patients. Although its popularity is growing, there is little understanding of how teleconsultation impacts on the role of nurses. The study adopted a constructivist grounded theory method, supplemented by the use of Straussian analytical approaches. Using selective and theoretical approaches, registered nurses with experience of using video in health care were sampled. Data were collected using semi-structured interviews exploring experiences, knowledge and feelings surrounding teleconsultation. Interviews were recorded, transcribed and subjected to three-stage, nonlinear manual analysis (open, axial and selective coding). Theoretical saturation occurred after 17 interviews. The core category identified from the data was 'nursing presence' Four subcategories of nursing presence were identified: operational, clinical, therapeutic and social. The degree to which presence could be achieved was dependent upon three influencing factors - enablers, constraints and compensation. Nurses provide different types of presence during teleconsultation, with the degree of presence dependent on specific characteristics of video-mediated communication. Where the use of video constrains the delivery of presence, nurses use a range of compensatory mechanisms to enhance patient care. Teleconsultation provides an innovative approach to enhancing the delivery of health care. This study provides nurses with insight into the impact of teleconsultation on their professional role, and an understanding of how best to use video-mediated communication to support patient care. © 2016 John Wiley & Sons Ltd.

  13. Is Host Ectoparasite Load Related to Echeneid Fish Presence?

    Directory of Open Access Journals (Sweden)

    Gonzalo R. Mucientes

    2008-01-01

    Full Text Available This study used field data of echeneid and ectoparasite associations with free-swimming whale sharks (Rhincodon typus and captured mako sharks (Isurus oxyrinchus to test whether (1 echeneid presence was positively correlated with ectoparasite presence; and (2 the number of ectoparasites was negatively correlated with the number of echeneid fish. Data from whale and mako sharks do not support the first hypothesis whereas data from mako sharks yields support for the second hypothesis. The results indicate that echeneids do regulate the number of ectoparasites on at least some host species, but these benefits may be contingent on the echeneid species.

  14. The Performative Presence in the Scenics Arts and the Improvisation

    Directory of Open Access Journals (Sweden)

    Gisela Reis Biancalana

    2011-05-01

    Full Text Available This article makes a reflection about the relevance of improvisation aspect in the performative arts as a fomenter element of scenic presence. Performances can be defined by the moment when one or more bodies shows themselves to other people eyes and the presence here means the performer ability to attract the viewer‟s attention to himself. The improvisational aspect comes out of these situations can be applied at many levels and many ways but mainly depends on the performer in his desire to do, namely, in giving psychophysically himself to his art.

  15. Is Host Ectoparasite Load Related to Echeneid Fish Presence?

    International Nuclear Information System (INIS)

    Mucientes, G.R.; Queiroz, N.; Queiroz, N.; Pierce, S.J.; Pierce, S.J.; Sazima, I.; Brunnschweiler, J.M.

    2008-01-01

    This study used field data of echeneid and ectoparasitic associations with free-swimming whale sharks (Rhincodon typus) and captured mako sharks (Isurus oxyrinchus) to test whether (1) echeneid presence was positively correlated with ectoparasitic presence; and (2) the number of ectoparasitic was negatively correlated with the number of echeneid fish. Data from whale and mako sharks do not support the first hypothesis whereas data from mako sharks yields support for the second hypothesis. The results indicate that echeneids do regulate the number of ectoparasitic on at least some host species, but these benefits may be contingent on the echeneid species.

  16. Galactic cluster winds in presence of a dark energy

    Science.gov (United States)

    Bisnovatyi-Kogan, G. S.; Merafina, M.

    2013-10-01

    We obtain a solution for the hydrodynamic outflow of the polytropic gas from the gravitating centre, in the presence of the uniform dark energy (DE). The antigravity of DE is enlightening the outflow and makes the outflow possible at smaller initial temperature, at the same density. The main property of the wind in the presence of DE is its unlimited acceleration after passing the critical point. In application of this solution to the winds from galaxy clusters, we suggest that collision of the strongly accelerated wind with another galaxy cluster, or with another galactic cluster wind, could lead to the formation of a highest energy cosmic rays.

  17. Enforcing Transferable Permit Systems in the Presence of Market Power

    International Nuclear Information System (INIS)

    Chavez, C.A.; Stanlund, J.K.

    2003-01-01

    We derive an enforcement strategy for a transferable permit system in the presence of market power that achieves complete compliance in a cost-effective manner. We show that the presence of a firm with market influence makes designing an enforcement strategy more difficult than enforcing a perfectly competitive system. We also re-consider the suggestion that a firm with market influence should be allocated permits so that it chooses to not participate in the permit market. When enforcement and its costs are taken into account, that suggestion does not hold except in a very special case

  18. Composição do sangue e do leite em ovinos leiteiros do sul do Brasil: variações na gestação e na lactação Blood and milk composition in dairy ewes from southern Brazil: variations during pregnancy and lactation

    Directory of Open Access Journals (Sweden)

    Marcelo Arnt Brito

    2006-06-01

    Full Text Available A ovinocultura de leite tem avançado no Rio Grande do Sul nos últimos anos, sem o conhecimento das variações nos parâmetros metabólicos e de composição do leite que possa servir de apoio à pesquisa e à clínica. Este trabalho teve por objetivo estudar a variação dos perfis metabólico e hematológico e da composição do leite em ovinos leiteiros da raça Lacaune criados em regime de confinamento na Serra Gaúcha. O trabalho foi realizado no município de Bento Gonçalves (região serrana do RS. Foram coletadas amostras de sangue de 14 animais por venipunção jugular para a realização de hemograma e do perfil bioquímico, em cada uma das seguintes categorias: ovelhas vazias; aos 60, 90 e 120 dias de gestação e aos 7, 30, 60 e 140 dias de lactação. Durante os mesmos períodos da lactação, foram coletadas amostras para a determinação dos componentes físico-químicos do leite. A acidez Dornic e o teor de proteína e gordura do leite foram diferentes dos citados em outros países. O perfil metabólico apresentou maiores variações com relação à média no final da gestação e no início da lactação. A uréia mostrou diferença (PDairy sheep industry has increased intensively in southern Brazil, however, without the corresponding knowledge of variations on metabolic and hematological parameters and on milk composition, with application in research and clinical activities. This work was carried out on Lacaune sheep, intensively grazed in the county of Bento Gonçalves (RS, in southern Brazil. Blood samples were collected from the jugular vein for metabolic profiles and hematology. Samples were taken randomly from 14 sheep in each of the following periods: nonpregnant ewes; at 60, 90 and 120 of pregnancy and at 7, 30, 60 and 140 days of lactation. During the lactation period, milk samples were also taken to assay the physico-chemical composition. Milk acidity, protein and fat levels were different from reference levels in

  19. Variações do conteúdo de carboidratos em gemas e ramos de dois anos de macieira em região de baixa ocorrência de frio Variations of carbohydrate content in two year old buds and stems of apple trees in a region of low chill occurence

    Directory of Open Access Journals (Sweden)

    Ruy Inacio Neiva de Carvalho

    2005-12-01

    Full Text Available Objetivou-se analisar as variações do conteúdo de carboidratos em gemas e ramos de dois anos de idade de macieira 'Imperial Gala' com ou sem frio suplementar durante o outono e inverno, cultivadas em região de baixa ocorrência de frio. Os ramos foram coletados em Porto Amazonas-PR, em intervalos de 21 dias, de abril a agosto (19-04, 10-05, 31-05, 21-06, 12-07, 02-08 e 23-08 e receberam ou não tratamento com frio suplementar de 1.440 horas à temperatura de 4 a 7° C. As análises de carboidratos foram realizadas em gemas e porções de ramos adjacentes às mesmas. Os carboidratos solúveis (CS totais foram determinados pelo método do fenol-ácido sulfúrico, realizando-se a leitura por espectrofotometria (absorbância a 490 nm. Os carboidratos insolúveis (CI totais foram estimados pelo rendimento da fração de tecido vegetal insolúvel em álcool e solúvel em álcali, após liofilização. Existem significativas variações do conteúdo de carboidratos em gemas e ramos de dois anos durante a dormência. O aumento da intensidade de dormência no outono está associado à redução do conteúdo de CS em gemas. O tratamento com 1.440 horas de frio suplementar modifica significativamente as variações do conteúdo de CS em ramos e de CI em gemas.This work aimed to quantify the variation of carbohydrate content in two year old buds and stems of apple trees cv. 'Imperial Gala' with or without supplementary chill during autumn and winter, cultivated in a region of low chill occurence. The stems were collected in Porto Amazonas, Parana State, Brazil, at intervals of 21 days from April to August (April 19th, May 10th, May 31st, June 21st, July 12th, August 2nd and August 23rd and were either treated or not with 1,440 hours of chill (4 to 7° C. The carbohydrates were analysed in buds and stem tissues adjacent to the buds. The soluble carbohydrates (SC were evaluated by the phenol-sulfuric acid method and the final determination was achieved by

  20. Dysprosium (holmium) determination in the presence of erbium and dysprosium (holmium, erbium) determination in the presence of cerium

    International Nuclear Information System (INIS)

    Tolubara, A.I.; Kochubej, A.I.; Usatenko, Yu.I.

    1978-01-01

    Effect of salicylic acid upon complex formation in the systems REE - boronsulfoalizarinate, REE - oxine and REE - boronsulfoalizarinate - oxine is investigated. Comparison of optical characteristics of the above systems in the absence and in the presence of salicylic acid is carried out. It is established that in all the cases the effect of salicylic acid depends both on the nature of REE and the ratio of all the components of the system. Under certain conditions the given dependence is observed only for erbium complexes. Extraction-photometric methods of dysprosium and holmium determination in the presence of equal erbium amounts, as well as holmium and erbium determination in the presence of cerium equal amounts is developed

  1. Dysprosium (holmium) determination in the presence of erbium and dysprosium (holmium, erbium) determination in the presence of cerium

    Energy Technology Data Exchange (ETDEWEB)

    Tolubara, A I; Kochubei, A I; Usatenko, Yu I

    1978-01-01

    Effect of salicylic acid upon complex formation in the systems REE - boronsulfoalizarinate, REE - oxine and REE - boronsulfoalizarinate - oxine is investigated. Comparison of optical characteristics of the above systems in the absence and in the presence of salicylic acid is carried out. It is established that in all the cases the effect of salicylic acid depends both on the nature of REE and the ratio of all the components of the system. Under certain conditions the given dependence is observed only for erbium complexes. Extraction-photometric methods of dysprosium and holmium determination in the presence of equal erbium amounts, as well as holmium and erbium determination in the presence of cerium equal amounts is developed.

  2. Visual Realism and Presence in a Virtual Reality Game

    DEFF Research Database (Denmark)

    Hvass, Jonatan Salling; Larsen, Oliver Stevns; Vendelbo, Kasper Bøgelund

    2017-01-01

    Virtual Reality (VR) has finally entered the homes of consumers, and a large number of the available applications are games. This paper presents a between-subjects study (n=50) exploring if vi-sual realism (polygon count and texture resolution) affects pres-ence during a scenario involving gameplay...

  3. [The presence of a companion in the primary care consultation].

    Science.gov (United States)

    Turabián, J L; Pérez Franco, B

    2015-01-01

    The presence of an adult accompanying the patient in the consulting room is a significant fact that deserves the attention of the physician. Some types of companions and their presence in the consultation have been described and may improve communication, patient management, and participatory decision making, achieving greater patient satisfaction. Consultations with companion are generally longer, and patients accompanied are often elderly, women, less educated, and with poorer physical and mental health. But it is not known exactly what is the significance of a consultation with a companion. It may be a semiological fact to keep in mind for the family diagnosis, or it may be the risks of their presence, the influence of medication, or the importance of the doctors themselves that are the cause of the presence of a companion. Different communication skills must be achieved during the interview with the companion in the consultation, rather than with the patient alone. Copyright © 2014. Publicado por Elsevier España, S.L.U.

  4. Designing presence for real locomotion in immersive virtual environments

    DEFF Research Database (Denmark)

    Turchet, Luca

    2015-01-01

    This paper describes a framework for designing systems for real locomotion in virtual environments (VEs) in order to achieve an intense sense of presence. The main outcome of the present research is a list of design features that the virtual reality technology should have in order to achieve...

  5. Movement patterns of coastal bottlenose dolphins in the presence of ...

    African Journals Online (AJOL)

    The presence and movement of Indo-Pacific bottlenose dolphins Tursiops aduncus were investigated using shore-based observations made during a humpback whale Megaptera novaeangliae migration survey at Cape Vidal, South Africa, undertaken between June and October 1988–1991. Occurrence was analysed as ...

  6. A Test for the Presence of a Signal

    OpenAIRE

    Rolke, Wolfgang A.; Lopez, Angel M.

    2006-01-01

    We describe a statistical hypothesis test for the presence of a signal based on the likelihood ratio statistic. We derive the test for a case of interest and also show that for that case the test works very well, even far out in the tails of the distribution. We also study extensions of the test to cases where there are multiple channels.

  7. Impression Management: The Web Presence of College Presidents

    Science.gov (United States)

    Morgan, Joanne Cardin

    2013-01-01

    Leadership profile pages on organizational websites have become staged opportunities for impression management. This research uses content analysis to examine the strategies of assertive impression management used to construct the leadership Web presence of the 70 presidents of national public universities, as identified in the "US News and…

  8. Presence seeking and sensation seeking as motives for international travel.

    Science.gov (United States)

    Fontaine, G

    1994-12-01

    Although independent research has identified presence seeking and sensation seeking as important motives for a variety of activities, there is sufficient conceptual overlap to suggest the concepts describe in part the same motive or are related. The possible relationship was examined in motives of students for international travel. Nonsignificant correlations suggest that, at least for this activity, they are differentiable.

  9. Spatial Presence Theory: State of the art and challenges ahead

    NARCIS (Netherlands)

    Hartmann, T.; Wirth, W.; Vorderer, P.A.; Klimmt, C.; Schramm, H.; Böcking, S.; Lombard, M.; Biocca, F.; Jonathan Freeman,; Wijnand IJsselsteijn,; Rachel J. Schaevitz,

    2015-01-01

    Highlights key research currently being undertaken within the field of telepresence, providing the most detailed account of the field to date, advancing our understanding of a fundamental property of all media - the illusion of presence; the sense of "being there" inside a virtual environment, with

  10. Developing a "Social Presence Scale" for E-Learning Environments

    Science.gov (United States)

    Kilic Cakmak, Ebru; Cebi, Ayça; Kan, Adnan

    2014-01-01

    The purpose of the current study is to develop a "social presence scale" for e-learning environments. A systematic approach was followed for developing the scale. The scale was applied to 461 students registered in seven different programs at Gazi University. The sample was split into two subsamples on a random basis (n1 = 261; n2 =…

  11. Presence and Effects of Chemical Toxin on Feeding of Cowpea ...

    African Journals Online (AJOL)

    These varieties along with one susceptible variety (Tvu.76(Prima) were used for conducting two experiments together to find out the presence of a chemical and their role in aphid's feeding and survival. Comparative studies of the number of honey dew drops produced on varieties used in the experiment, and the reaction of ...

  12. Historical evidence for a pre-Columbian presence of Datura

    Indian Academy of Sciences (India)

    2007-12-04

    Dec 4, 2007 ... Further, the textual evidence traditionally cited in support of a pre-Columbian Old World presence of Datura species is suggested to be due to the misreading of classical Greek and Arabic sources. As a result, botanists generally accept the opinion that Datura species were transferred into the Old World in ...

  13. Using Online Presence to Improve Online Collaborative Learning

    Directory of Open Access Journals (Sweden)

    Zoran Jeremic

    2012-02-01

    Full Text Available Social software tools have become an integral part of students’ personal lives and their primary communication medium. Likewise, these tools are increasingly entering the enterprise world (within the recent trend known as Enterprise 2.0 and becoming a part of everyday work routines. Aiming to keep the pace with the job requirements and also to position learning as an integral part of students’ life, the field of education is challenged to embrace social software. Personal Learning Environments (PLEs emerged as a concept that makes use of social software to facilitate collaboration, knowledge sharing, group formation around common interests, active participation and reflective thinking in online learning settings. Furthermore, social software allows for establishing and maintaining one’s presence in the online world. By being aware of a student's online presence, a PLE is better able to personalize the learning settings, e.g., through recommendation of content to use or people to collaborate with. Aiming to explore the potentials of online presence for the provision of recommendations in PLEs, in the scope of the OP4L project, we have develop a software solution that is based on a synergy of Semantic Web technologies, online presence and socially-oriented learning theories. In this paper we present the current results of this research work.

  14. Clustering Binary Data in the Presence of Masking Variables

    Science.gov (United States)

    Brusco, Michael J.

    2004-01-01

    A number of important applications require the clustering of binary data sets. Traditional nonhierarchical cluster analysis techniques, such as the popular K-means algorithm, can often be successfully applied to these data sets. However, the presence of masking variables in a data set can impede the ability of the K-means algorithm to recover the…

  15. Ion Acoustic Waves in the Presence of Langmuir Oscillations

    DEFF Research Database (Denmark)

    Pécseli, Hans

    1976-01-01

    The dielectric function for long-wavelength, low-frequency ion acoustic waves in the presence of short-wavelength, high-frequency electron oscillations is presented, where the ions are described by the collision-free Vlasov equation. The effect of the electron oscillations can be appropriately...

  16. Quantification and presence of human ancient DNA in burial place ...

    African Journals Online (AJOL)

    Quantification and presence of human ancient DNA in burial place remains of Turkey using real time polymerase chain reaction. ... A published real-time PCR assay, which allows for the combined analysis of nuclear or ancient DNA and mitochondrial DNA, was modified. This approach can be used for recovering DNA from ...

  17. Computationally Secure Pattern Matching in the Presence of Malicious Adversaries

    DEFF Research Database (Denmark)

    Hazay, Carmit; Toft, Tomas

    2010-01-01

    simulation in the presence of malicious, polynomial-time adversaries (assuming that ElGamal encryption is semantically secure) and exhibits computation and communication costs of O(n + m) in a constant round complexity. In addition to the above, we propose a collection of protocols for variations...

  18. Presence of lupus anticoagulant in an asymptomatic Nigerian ...

    African Journals Online (AJOL)

    Method:A 25 year old \\'healthy\\' male Nigerian was screened for the presence of any coagulation abnormality using the KCT, PT and platelet count; after volunteering for his plasma to be used in the preparation of normal pooled plasma in a study. Results: He was discovered to have a prolonged KCT, PT and normal platelet ...

  19. Solitary drift waves in the presence of magnetic shear

    International Nuclear Information System (INIS)

    Meiss, J.D.; Horton, W.

    1982-07-01

    The two-component fluid equations describing electron drift and ion acoustic waves in a nonuniform magnetized plasma are shown to possess nonlinear two-dimensional solitary wave solutions. In the presence of magnetic shear, radiative shear damping is exponentially small in L/sub s//L/sub n/ for solitary drift waves, in contrast to linear waves

  20. Presence and Positioning as Components of Online Instructor Persona

    Science.gov (United States)

    Dennen, Vanessa Paz

    2007-01-01

    Instructor persona in online discussion may set the tone for a variety of course outcomes. Instructors establish persona via both presence (amount of instructor posts) and position (interaction relative to those in the student role). In this paper, three online classes were studied using positioning theory as a grounding framework to elicit ways…

  1. Hvad er NATO enhanced Forward Presence, og hvordan bidrager Danmark?

    DEFF Research Database (Denmark)

    Lillelund, Lene Sonne; Ringsmose, Jens

    I begyndelsen af januar 2018 udsender Danmark et militært bidrag på ca. 200 soldater til NATO's såkaldte "forstærkede fremskudte tilstedeværelse" / "enhanced Forward Presence" (eFP) i Baltikum og Polen. Det danske kontingent bliver udstationeret i Tapa, Estland, og det skal dels være med til...

  2. Inadvertent presence of genetically modified elements in maize food ...

    African Journals Online (AJOL)

    Kenya has a biosafety law and has tested genetically modified (GM) maize under confinement and containment, but has neither released nor commercialized any GM crop. This study assessed various maize food products from the Kenyan farms and markets for the inadvertent presence of GMOs. It assessed the possibility ...

  3. Optimal Software Strategies in the Presence of Network Externalities

    Science.gov (United States)

    Liu, Yipeng

    2009-01-01

    Network externalities or alternatively termed network effects are pervasive in computer software markets. While software vendors consider pricing strategies, they must also take into account the impact of network externalities on their sales. My main interest in this research is to describe a firm's strategies and behaviors in the presence of…

  4. Robustness in cluster analysis in the presence of anomalous observations

    NARCIS (Netherlands)

    Zhuk, EE

    Cluster analysis of multivariate observations in the presence of "outliers" (anomalous observations) in a sample is studied. The expected (mean) fraction of erroneous decisions for the decision rule is computed analytically by minimizing the intraclass scatter. A robust decision rule (stable to

  5. Deposition of silicon films in presence of nitrogen plasma— A ...

    Indian Academy of Sciences (India)

    Unknown

    Abstract. A design, development and validation work of plasma based 'activated reactive evaporation (ARE) system' is implemented for the deposition of the silicon films in presence of nitrogen plasma on substrate maintained at room temperature. This plasma based deposition system involves evaporation of pure silicon by.

  6. Stochastic resonance in the presence of slowly varying control parameters

    International Nuclear Information System (INIS)

    Nicolis, C; Nicolis, G

    2005-01-01

    The kinetics of transitions between states in a noisy system is studied in the simultaneous presence of a periodic forcing and a ramp. It is shown that the interaction between stochastic resonance and the action of the ramp may give rise to a new method for the control of the transition rates

  7. Active Power Deficit Estimation in Presence of Renewable Energy Sources

    DEFF Research Database (Denmark)

    Hoseinzadeh, Bakhtyar; Silva, Filipe Miguel Faria da; Bak, Claus Leth

    2015-01-01

    The inertia of the power system is reduced in the presence of Renewable Energy Sources (RESs) due to their low or even no contribution in the inertial response as it is inherently available in the Synchronous Machines (SMs). The total inertia of the grid becomes unknown or at least uncertain...

  8. A Massively Scalable Architecture for Instant Messaging & Presence

    NARCIS (Netherlands)

    Schippers, Jorrit; Remke, Anne Katharina Ingrid; Punt, Henk; Wegdam, M.; Haverkort, Boudewijn R.H.M.; Thomas, N.; Bradley, J.; Knottenbelt, W.; Dingle, N.; Harder, U.

    2010-01-01

    This paper analyzes the scalability of Instant Messaging & Presence (IM&P) architectures. We take a queueing-based modelling and analysis approach to ��?nd the bottlenecks of the current IM&P architecture at the Dutch social network Hyves, as well as of alternative architectures. We use the

  9. Presence of inbreeding during a selection experiment with Merino ...

    African Journals Online (AJOL)

    Presence of inbreeding during a selection experiment with Merino sheep. GJ Erasmus, AO de Lange, GJ Delport, JJ Olivier. Abstract. No Abstract. Full Text: EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · AJOL African Journals Online. HOW TO USE AJOL.

  10. On the importance of presence within fandom spaces

    DEFF Research Database (Denmark)

    Jensen, Thessa

    2017-01-01

    Presence and copresence in Goffman’s sense are some of the main building blocks of fandom groups in online spaces. This article provides a definition of both especially developed to take the online environment of fandom into account. At the same time, a framework for analysis and design of fandom...

  11. The Carrier Strike Group: Examining Approaches to Forward Presence

    Science.gov (United States)

    2016-09-01

    Presence, 4. 129 Robert O. Keohane 1941- Neorealism and Its Critics (New York: Columbia University Press, 1986), 100. 37 coalitions, an...Diplomat. April 20, 2013. http://thediplomat.com/2013/04/the-a2ad-hit-list/. Keohane , Robert O. 1941- Neorealism and Its Critics. New York: Columbia

  12. The sine-Gordon model in the presence of defects

    International Nuclear Information System (INIS)

    Avan, Jean; Doikou, Anastasia

    2013-01-01

    The sine-Gordon model in the presence of dynamical integrable defects is investigated. This is an application of the algebraic formulation introduced for integrable defects in earlier works. The quantities in involution as well as the associated Lax pairs are explicitly extracted. Integrability i also shown using certain sewing constraints, which emerge as suitable continuity conditions.

  13. Disorder affects judgements about a neighbourhood: police presence does not

    NARCIS (Netherlands)

    Hill, J.; Pollet, T.V.; Nettle, D.

    2014-01-01

    Many police forces operate a policy of high visibility in disordered neighbourhoods with high crime. However, little is known about whether increased police presence influences people's beliefs about a neighbourhood's social environment or their fear of crime. Three experimental studies compared

  14. Inflaton fluctuations in the presence of cosmological defects

    Science.gov (United States)

    Cho, Hing-Tong; Ng, Kin-Wang; Wang, I.-Chin

    2014-11-01

    We study quantum fluctuations of a free massless scalar field during inflation in the presence of a point, line, or plane defect such as a black hole, cosmic string, or domain wall, using a perturbative expansion in powers of small defect parameters. We provide results for the scalar two-point correlation functions that show explicitly a small violation of translational invariance during inflation.

  15. Presence in Video-Mediated Interactions: Case Studies at CSIRO

    Science.gov (United States)

    Alem, Leila

    Although telepresence and a sense of connectedness with others are frequently mentioned in media space studies, as far as we know, none of these studies report attempts at assessing this critical aspect of user experience. While some attempts have been made to measure presence in virtual reality or augmented reality, (a comprehensive review of existing measures is available in Baren and Ijsselsteijn [2004]), very little work has been reported in measuring presence in video-mediated collaboration systems. Traditional studies of video-mediated collaboration have mostly focused their evaluation on measures of task performance and user satisfaction. Videoconferencing systems can be seen as a type of media space; they rely on technologies of audio, video, and computing put together to create an environment extending the embodied mind. This chapter reports on a set of video-mediated collaboration studies conducted at CSIRO in which different aspects of presence are being investigated. The first study reports the sense of physical presence a specialist doctor experiences when engaged in a remote consultation of a patient using the virtual critical care unit (Alem et al., 2006). The Viccu system is an “always-on” system connecting two hospitals (Li et al., 2006). The presence measure focuses on the extent to which users of videoconferencing systems feel physically present in the remote location. The second study reports the sense of social presence users experience when playing a game of charades with remote partners using a video conference link (Kougianous et al., 2006). In this study the presence measure focuses on the extent to which users feel connected with their remote partners. The third study reports the sense of copresence users experience when building collaboratively a piece of Lego toy (Melo and Alem, 2007). The sense of copresence is the extent to which users feel present with their remote partner. In this final study the sense of copresence is

  16. Leaching of spent fuel in the presence of environmental material

    International Nuclear Information System (INIS)

    Le Lous, Karine

    1997-01-01

    The aim of this work is the study of the alteration kinetics of spent fuels and the making of a status of the radioactivity released by spent fuels in conditions of direct disposal in deep underground. A system has been fitted inside a shielded cell to study the leaching by synthetic groundwater of fuel powder irradiated at 60 GWJ.tU -1 in the presence of environmental material (clay or granite) at 40 bars and 90 deg. C. This system allows to reach and keep reductive conditions characteristic of the redox conditions of a deep geological repository. The preparation of calibrated spent fuel powders and the recovery of the activity fixed by the environmental materials has required the implementation of specific procedures. Similar experiments have been performed in parallel with Simfuel in a controlled area. A first series of experiments has been carried out in 4 environments for each fuel. Important sorption phenomena take place in the environmental materials and the actinide concentrations stabilize rapidly at low values: 10 -8 mol/l for U, 10 -12 mol/l for Pu and 10 -13 -10 -14 mol/l for Cm. The activity released by 90 Sr at the end of each experiment is about two times higher in the presence of clay than in the presence of granite. The average alteration rates are of about 0.2 mg.m -2 /day in the presence of granite and 0.4 to 0.6 mg.m -2 /day in the presence of clay. They are comparable to those reported in the literature for reducing conditions. Such tests are necessary to determine the leaching rate of spent fuels in reducing conditions and in the absence of environmental materials in order to show the possible effects of these materials. (J.S.)

  17. Seasonal variation of the phytoplankton community structure in the São João River, Iguaçu National Park, Brazil Variação sazonal da estrutura da comunidade fitoplanctônica no Rio São João, Parque Nacional do Iguaçu, Brasil

    Directory of Open Access Journals (Sweden)

    JC. Bortolini

    2013-02-01

    , calculados a partir da densidade fitoplanctônica, foram temporalmente heterogêneos e espacialmente similares. Em geral, variações significativas na composição do fitoplâncton foram devidas às variações nas condições limnológicas, principalmente temperatura, transparência e nutrientes. Espacialmente, a estrutura foi mais similar, em razão da proximidade das estações e, também, da similaridade da distribuição da comunidade em ambientes lóticos, devido ao fluxo unidirecional.

  18. Relação entre diferença mínima significativa e coeficiente de variação nos ensaios de competição de cultivares Relation among least significant difference and coefficient of variation in the cultivar competition trials

    Directory of Open Access Journals (Sweden)

    Alessandro Dal Col Lúcio

    1998-06-01

    Full Text Available O objetivo deste trabalho foi caracterizar ensaios de competição de cultivares de milho, trigo, soja, feijão, cevada, aveia, triticale e sorgo conduzidos no Estado do Rio Grande do Sul e estimar a relação entre a diferença mínima significativa (DMS e o coeficiente de variação (CV. Foram utilizadas as principais características estatísticas de 2014 ensaios: delineamento experimental, número de cultivares, número de repetições, número de graus de liberdade do erro, CV e a DMS obtida pelo método de Tukey em porcentagem da média dos ensaios. A estimativa da equação de regressão entre a DMS e o CV (variável independente, passando pela origem, resultou numa relação média de DMS = 2,72xCV, variando entre 2,47 (cevada e 3,05 (sorgo. Esta variação nas relações indicam que existe diferenças nos planos experimentais tradicionais usados pelos pesquisadores. A DMS é uma estatística adequada para o controle de qualidade dos ensaios de competição de cultivares. Ela é facilmente obtido a partir do CV e reflete, em termos do valor comercial da produção, a importância da sua magnitude.The objetive of this work was to study competition trials of maize, wheat, soybeans, drybeans, barley, oats, triticale and sorghum conducted in Rio Grande do Sul State and estimate relations between least significant difference and coefficient of variation. Statistics characteristics of 2014 trials were used, such as: experimental design, number of cultivars, replications, error degrees of freedom, coeffïcient of variation (CV and least significant difference (LSD obtained from Tukey's test by the porcentage of the experiment mean. The regression equation passing through the origin obtained between LSD and CV as the independent variable resulted in LSD = 2.72xCV, with the angular coeffïcient ranging from 2.47 (barley to 3.05 (sorghum. These difference indicate that there are deviations of the traditional experimental layouts used by field crop

  19. Variações do conteúdo de glucose, frutose e sorbitol em gemas e ramos de macieira durante a dormência Variations of glucose, frutose and sorbitol content in buds and stems of apple tree during the dormancy period

    Directory of Open Access Journals (Sweden)

    Ruy Inacio Neiva de Carvalho

    2006-12-01

    Full Text Available O objetivo deste trabalho foi determinar as variações do conteúdo de glucose, frutose e sorbitol em gemas e ramos de um ano de macieira durante o período de dormência. Os ramos da cultivar "Imperial Gala" foram coletados em Porto Amazonas-PR, em intervalos de 21 dias, de abril a agosto (19/04, 10/05, 31/05, 21/06, 12/07, 02/08 e 23/08, e receberam ou não tratamento com frio suplementar de 1.440 horas à temperatura de 4 a 7°C. As análises dos carboidratos foram realizadas em gemas e porções de ramos adjacentes às primeiras por cromatografia líquida de alta eficiência (HPLC. Ocorreu um acúmulo de glucose, frutose e sorbitol nas gemas de macieira durante a dormência. O acúmulo de glucose e frutose nos ramos aconteceu até o início de agosto quando, em seguida, houve redução, enquanto o sorbitol decresceu até junho e, em seguida, elevou-se até o final de agosto. O tratamento com frio ao longo da dormência modificou as variações dos conteúdos de carboidratos nas gemas e ramos de macieira.This research was aimed at evaluating the variations of glucose, frutose and sorbitol content in one year old buds and stems of apple trees during the dormancy period. The stems of cv. Imperial Gala were collected in Porto Amazonas, Parana State, Brazil, at intervals of 21 days from April to August (April 19th, May 10th, May 31st, June 21st, July 12th, August 2nd and August 23rd and were treated or not with 1,440 hours of chill (4 to 7°C. The carbohydrates were analysed in buds and stem tissues close to buds by high performance liquid chromatography (HPLC. There was an increase of glucose, frutose and sorbitol content in apple tree buds during the dormancy. An increase of glucose and frutose content in stems occured until August 2nd followed by a significative reduction, while the sorbitol content decreased until June 21st followed by an increase until August 31st. The chill treatment during the dormancy period modified the variations of

  20. Predators control post-fledging mortality in tawny owls, Strix aluco

    DEFF Research Database (Denmark)

    Sunde, Peter

    2005-01-01

    , primarily due to predation from raptors and mammals (predominantly foxes Vulpes vulpes). Predation by mammals occurred within the first few days after fledging, with young leaving the nest at an early age being at particularly high risk. Young that had received extra food as nestlings were also at higher...... risk of being preyed upon by mammals, possibly because they were easier to locate on their smell. Total mortality risk (control broods) increased with fledging date from 14% in April to >58% in June due to an increasing raptor predation risk. Individual attributes such as sex, condition......, immunocompetence or prevalence of blood parasites did not predict total or cause-specific mortality risk. Survival during the post-fledging dependency period was therefore primarily a function of variation in predation pressures, particularly from raptors. Increasing raptor predation of late broods appears...

  1. OVERSEAS PRESENCE: Issues Involved in Reducing the Impact of the U.S. Military Presence on Okinawa

    National Research Council Canada - National Science Library

    1998-01-01

    .... Of this presence, 47,000 servicemembers are in Japan, over half of whom are based on Okinawa. On December 2, 1996, the United States and Japan agreed to a number of recommendations for reducing the impact of U.S...

  2. Presence of abscisic acid, a phytohormone, in the mammalian brain

    International Nuclear Information System (INIS)

    Le Page-Degivry, M.T.; Bidard, J.N.; Rouvier, E.; Bulard, C.; Lazdunski, M.

    1986-01-01

    This paper reports the presence of abscisic acid, one of the most important phytohormones, in the central nervous system of pigs and rats. The identification of this hormone in brain was made after extensive purification by using a radioimmunoassay that is very specific for (+)-cis-abscisic acid. The final product of purification from mammalian brain has the same properties as authentic abscisic acid: it crossreacts in the radioimmunoassay for the phytohormone and it has the same retention properties and the same gas chromatography/mass spectrometry characteristics. Moreover, like (+)-cis-abscisic acid itself, the brain factor inhibits stomatal apertures of abaxial epidermis strips of Setcreasea purpurea Boom (Commelinaceae). The presence of abscisic acid conjugates that are present in plants has also been identified in brain

  3. Hindered protein dynamics in the presence of a cryoprotecting agent

    Energy Technology Data Exchange (ETDEWEB)

    Koeper, I. [Laboratoire Leon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette (France); Physikdepartment E13, TU Muenchen, 85747 Garching (Germany); Bellissent-Funel, M.C. [Laboratoire Leon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette (France)

    2002-07-01

    We present a study of the influence of trehalose, a well-known cryoprotecting disaccharide, on the dynamics of a protein, the C-phycocyanin. The dynamics is investigated in a time range from some picoseconds to several nanoseconds using different neutron-scattering techniques. Data obtained on samples containing hydrated powders of the protein in the presence of trehalose are compared to that of the protein alone, studied by neutron-scattering techniques as well as by molecular dynamics simulations. The analysis of time-of-flight data gives access to the geometry of the observed motions. These motions can be described via a model of a particle diffusing inside a sphere. We observe a slowing down of the movements of the protein due to the presence of trehalose of one to two orders of magnitude, while the geometry of the motions is conserved. (orig.)

  4. The presence of English and Spanish dyslexia in the Web

    Science.gov (United States)

    Rello, Luz; Baeza-Yates, Ricardo

    2012-09-01

    In this study we present a lower bound of the prevalence of dyslexia in the Web for English and Spanish. On the basis of analysis of corpora written by dyslexic people, we propose a classification of the different kinds of dyslexic errors. A representative data set of dyslexic words is used to calculate this lower bound in web pages containing English and Spanish dyslexic errors. We also present an analysis of dyslexic errors in major Internet domains, social media sites, and throughout English- and Spanish-speaking countries. To show the independence of our estimations from the presence of other kinds of errors, we compare them with the overall lexical quality of the Web and with the error rate of noncorrected corpora. The presence of dyslexic errors in the Web motivates work in web accessibility for dyslexic users.

  5. Thinking aloud in the presence of interruptions and time constraints

    DEFF Research Database (Denmark)

    Hertzum, Morten; Holmegaard, Kristin Due

    2013-01-01

    and time constraints, two frequent elements of real-world activities. We find that the presence of auditory, visual, audiovisual, or no interruptions interacts with thinking aloud for task solution rate, task completion time, and participants’ fixation rate. Thinking-aloud participants also spend longer......Thinking aloud is widely used for usability evaluation and its reactivity is therefore important to the quality of evaluation results. This study investigates whether thinking aloud (i.e., verbalization at levels 1 and 2) affects the behaviour of users who perform tasks that involve interruptions...... responding to interruptions than control participants. Conversely, the absence or presence of time constraints does not interact with thinking aloud, suggesting that time pressure is less likely to make thinking aloud reactive than previously assumed. Our results inform practitioners faced with the decision...

  6. Unexpected strong attraction in the presence of continuum bound state

    International Nuclear Information System (INIS)

    Delfino, A.; Frederico, T.

    1992-06-01

    The result of few-particle ground-state calculation employing a two-particle non-local potential supporting a continuum bound state in addition to a negative-energy bound state has occasionally revealed unexpected large attraction in producing a very strongly bound ground state. In the presence of the continuum bound state the difference of phase shift between zero and infinite energies has an extra jump of φ as in the presence of an additional bound state. The wave function of the continuum bound state is identical with that of a strongly bound negative-energy state, which leads us to postulate a pseudo bound state in the two-particle system in order to explain the unexpected attraction. The role of the Pauli forbidden states is expected to be similar to these pseudo states. (author)

  7. Presence, Mourning, and Beauty: Elements of Analytic Process.

    Science.gov (United States)

    Markman, Henry C

    2017-12-01

    Analyst and patient occasionally arrive at moments of heightened meaning and aliveness. These moments can be transformative and lead to psychic change in the patient. They give life and arouse hope, and feel "real" in a new way, though often entailing emotional turbulence. Specific internal work must be done by the analyst to allow for and foster these experiences. This involves a kind of mourning process in the analyst that allows for "presence" and "availability" as described by Gabriel Marcel, and for the "at-one-ment" described by Bion. These transforming moments can be viewed in an aesthetic realm, along the lines of Keats's "Beauty is truth, truth beauty." This embodies the analytic value of emotional truth. These moments are shared and their emergence is an intersubjective creation. Clinical illustrations show how the internal work of mourning by the analyst through directed introspection allows for presence and availability, and then for shared moments of beauty with the patient.

  8. The importance of antibiotic residues presence detection in milk

    Directory of Open Access Journals (Sweden)

    Dubravka Samaržija

    2002-01-01

    Full Text Available Antibiotic residues are the most present inhibitory substances in milkhaving undesirable effect on human health, technological characteristics and the quality of milk and dairy products. In order to protect consumer's health and to ensure high quality milk production, European Union (EU regulation 2377/90 sets a maximum permitted levels for antibiotic residues in milk. Although the presence of antibiotic residues in milk can be due to animal diseases treatment, and in the case of milking animals, they are mostly present after mastitis treatment. The aim of this work is to stress the importance of the continuous control on antibiotic residues presence in milk, due to the role that milk and dairy products have in human nutrition. In this paper, different groups of antibiotics, mechanisms of theirs action, mistakes occurring in dairy products manufacture as well as the methods for theirs detection are described.

  9. Spectrophotometric titration of sulfates in the presence of zirconium

    International Nuclear Information System (INIS)

    Kuznetsov, V.V.; Kotova, S.S.; Molokanova, L.G.; Chekmarev, A.M.; Yagodin, G.A.

    1978-01-01

    The procedure has been proposed for express determination of sulphate ions in the presence of zirconium by spectrophotometric titration with the use of barium chloride and nitrochromazo as an indicator. The procedure is based on bonding zirconium into a more stable complex with EDTA (ethylenediaminotetraacetic acid). The presence of excess of EDTA and zirconium (4) complexonate in the solution being titrated does not affect the titration curve shape and the character of break on the curve in the equivalence point. A complete demasking of SO 4 2- is observed in the case of 1O-fold excess of EDTA with respect to zirconium (4). Statistic evaluation of the method has shown that the results of titration can be distorted by chance errors only

  10. Chaos-assisted tunneling in the presence of Anderson localization.

    Science.gov (United States)

    Doggen, Elmer V H; Georgeot, Bertrand; Lemarié, Gabriel

    2017-10-01

    Tunneling between two classically disconnected regular regions can be strongly affected by the presence of a chaotic sea in between. This phenomenon, known as chaos-assisted tunneling, gives rise to large fluctuations of the tunneling rate. Here we study chaos-assisted tunneling in the presence of Anderson localization effects in the chaotic sea. Our results show that the standard tunneling rate distribution is strongly modified by localization, going from the Cauchy distribution in the ergodic regime to a log-normal distribution in the strongly localized case, for both a deterministic and a disordered model. We develop a single-parameter scaling description which accurately describes the numerical data. Several possible experimental implementations using cold atoms, photonic lattices, or microwave billiards are discussed.

  11. Pulse photolysis of NADH in the presence of cysteine

    International Nuclear Information System (INIS)

    Scheel, H.E.

    1976-01-01

    In the UV irradiation of NADH under anaerobic conditions, cysteine, which often acts as a radioprotective substance, has a sensitizing effect. With the aid of pulse photolysis, it was studied which reaction mechanisms in the presence or absence of cysteine are responsible for the damage to NADH in aqueous solution. In the absence of cysteine, the characteristic NADH absorption at 340 nm is reduced immediately after UV quanta have been absorbed by the adenine fraction of the molecules; in the presence of cysteine, a secondary reaction causes additional damage. The spectra of the intermediate products of NADH and cysteine have been recorded for different cysteine concentrations, and the reaction constants have been determined. These values suggest that the sensitizing effect is due to a reaction of NADH with radical anions produced by photolysis. (orig.) [de

  12. Sample efficient multiagent learning in the presence of Markovian agents

    CERN Document Server

    Chakraborty, Doran

    2014-01-01

    The problem of Multiagent Learning (or MAL) is concerned with the study of how intelligent entities can learn and adapt in the presence of other such entities that are simultaneously adapting. The problem is often studied in the stylized settings provided by repeated matrix games (a.k.a. normal form games). The goal of this book is to develop MAL algorithms for such a setting that achieve a new set of objectives which have not been previously achieved. In particular this book deals with learning in the presence of a new class of agent behavior that has not been studied or modeled before in a MAL context: Markovian agent behavior. Several new challenges arise when interacting with this particular class of agents. The book takes a series of steps towards building completely autonomous learning algorithms that maximize utility while interacting with such agents. Each algorithm is meticulously specified with a thorough formal treatment that elucidates its key theoretical properties.

  13. Irradiation of polyethylene in the presence of antioxidants

    Science.gov (United States)

    Jaworska, E.; Kałuska, I.; Strzelczak-Burlińska, G.; Michalik, J.

    The radiation induced reactions in LDPE in the presence of phenolic type antioxidants have been studied. It was shown that various antioxidants can influence the polyethylene network formation and the radical yield in different ways. The dependence of network structure on absorbed doses was determined by gel analysis, hot-set test and extraction of antioxidants for samples irradiated with accelerated electrons. It was found that the antioxidants eluated from polyethylene in higher percentage influence polymer crosslinking to a smaller degree. The ESR studies of γ-irradiated blends of polyethylene with antioxidant indicate the presence of alkyl and phenoxyl radicals. The role of antioxidant molecules on radiation induced reactions in polyethylene-antioxidant systems is considered. The correlation between the network structure and the type of additive in polyethylene is also discussed.

  14. Gravimetric determination of beryllium in the presence of transition metals

    International Nuclear Information System (INIS)

    Morozova, S.S.; Nikitina, L.V.; Dyatlova, N.M.; Serebryakova, G.V.; Vol'nyagina, A.N.

    1976-01-01

    A new organic reagent, nitrolotrimethylphosphonic acid (H 6 L), is proposed for gravimetric determination of beryllium. This complexone forms with Be hardly soluble complexes in a wide pH range. The separated complex has a composition Be 5 (HL) 2 x10H 2 O. To elucidate the possibility of determining Be in the presence of transition metals, often accompanying beryllium in alloys, interaction of cations of these metals with H 6 L at different pH has been studied potentiometrically. It has been established that at pH=1.1 in the presence of masking reagent (diethylentriaminopentacetic acid) Be can be determined when zinc, copper, chromium, cobalt, nickel, iron, manganese and cadmium are present. Gravimetric method of determining Be with the help of H 6 L has been developed. The weight form is obtained by drying the precipitate which reduces considerably the time of analysis and the error of determination

  15. RECOMBINATION OF ANTIBODY POLYPEPTIDE CHAINS IN THE PRESENCE OF ANTIGEN

    Science.gov (United States)

    Metzger, Henry; Mannik, Mart

    1964-01-01

    Conditions were developed by which the separated H and L chains of gamma2 globulins recombined to form four-chained molecules in good yields. In the absence of antigen, anti-2,4-dinitrophenyl (anti-DNP) H chains randomly reassociated with a mixture of antibody and non-specific gamma2 globulin L chains. In the presence of a specific hapten, however, the antibody H chains preferentially interacted with the anti-DNP L chains. Antibody H chain-antibody L chain recombinants formed in the presence of hapten were more active than the corresponding recombinants formed in the absence of hapten. Speculations are made regarding the possible mechanisms and biological significance of these effects. PMID:14247718

  16. Body Presence on Stage in Performance Studies and in Ethnoscenology

    Directory of Open Access Journals (Sweden)

    Armindo Jorge de Carvalho Bião

    2011-11-01

    Full Text Available This is a brief analysis on the titles of two related cross-disciplinary contemporary perspectives, in the university context, which seek to articulate theory and practice, arts and sciences, creation and criticism, cultural diversity and specific contexts, Ethnoscenology and Performance Studies, with emphasis on the explicit statement of their focus of interest, respectively performance and body presence on stage, and a statement about preferable choices.

  17. Presence of abscisic acid, a phytohormone, in the mammalian brain.

    OpenAIRE

    Le Page-Degivry, M T; Bidard, J N; Rouvier, E; Bulard, C; Lazdunski, M

    1986-01-01

    This paper reports the presence of abscisic acid, one of the most important phytohormones, in the central nervous system of pigs and rats. The identification of this hormone in brain was made after extensive purification by using a radioimmunoassay that is very specific for (+)-cis-abscisic acid. The final product of purification from mammalian brain has the same properties as authentic abscisic acid: it crossreacts in the radioimmunoassay for the phytohormone and it has the same retention pr...

  18. ON ELLIPTICALLY POLARIZED ANTENNAS IN THE PRESENCE OF GROUND

    Science.gov (United States)

    The effect of ground reflections upon the far field of an elliptically polarized antenna of ar itrary orientation with r spect to ground is...investigated. The equation of the polarization ellipse produced by an elliptically polarized antenna in the presence of ground is derived, AND SEVERAL...EXAMPLES ILLUSTRATE THE VARIATION IN THE AXIS RATIO OF THE POLARIZATION ELLIPSE AS A FUNCTION OF THE GEOMETRY OF THE MEASURING SETUP. A method is presented

  19. Determinants of Small Business Presence in Japanese and UK Manufacturing

    OpenAIRE

    土井, 教之; Cowling, Mark

    1995-01-01

    The present paper has attempted to examine determinants of small business(SMEs) presence in Japanese and UK manufacturing industries, using a cross-industry model. The results suggest that market structure elements have a definite influence on SMEs' share. This conclusion is consistent with the findings observed in the US and other European countries. The main results here are the following; (1) Concentration is negatively related to SMEs' share. (2) Capital intensity and requirements have a ...

  20. Electron acoustic vortices in the presence of inhomogeneous current

    Energy Technology Data Exchange (ETDEWEB)

    Haque, Q; Masood, W; Saleem, H [Theoretical Plasma Physics Division, PINSTECH, P O Nilore, Islamabad (Pakistan)], E-mail: qamar@pinstech.org.pk

    2008-03-15

    Linear and nonlinear dynamics of an electron acoustic wave in an inhomogeneous magnetized plasma are studied in the presence of non-uniform background current. The modified Rayleigh instability condition is found due to shear in the magnetic field and the current. A nonlinear stationary solution is also obtained in the form of tripolar vortices. The relevance of the present study to auroral and magnetotail plasmas is pointed out.

  1. Nanostructure sensor of presence and concentration of a target molecule

    Science.gov (United States)

    Schipper, John F. (Inventor)

    2009-01-01

    Method and system (i) to determine when a selected target molecule is present or absent in a fluid, (2) to estimate concentration of the target molecule in the fluid and (3) estimate possible presence of a second (different) target molecule in the fluid, by analyzing differences in resonant frequencies of vibration of a thin beam suspended in the fluid, after the fluid has moved across the beam.

  2. Presence and enactment as a vehicle of psychotherapeutic change.

    Science.gov (United States)

    Viederman, M

    1999-01-01

    This article addresses an aspect of psychoanalytic and psychotherapeutic process that leads to change. Focusing on an aspect of the patient-therapist interaction that the author calls "presence" of the therapist, it demonstrates how the experience of this may lead the patient to unconscious enactment of early wishful fantasies concerning the good parent. The gratification of these wishes implicit in the interaction influences the therapist-patient relationship and plays a significant role in change.

  3. Classical electromagnetic field theory in the presence of magnetic sources

    OpenAIRE

    Chen, Wen-Jun; Li, Kang; Naón, Carlos

    2001-01-01

    Using two new well defined 4-dimensional potential vectors, we formulate the classical Maxwell's field theory in a form which has manifest Lorentz covariance and SO(2) duality symmetry in the presence of magnetic sources. We set up a consistent Lagrangian for the theory. Then from the action principle we get both Maxwell's equation and the equation of motion of a dyon moving in the electro-magnetic field.

  4. Presence of Spotters Improves Bench Press Performance: A Deception Study.

    Science.gov (United States)

    Sheridan, Andrew; Marchant, David C; Williams, Emily L; Jones, Hollie S; Hewitt, Phil A; Sparks, S Andy

    2017-10-24

    Sheridan, A, Marchant, DC, Williams, EL, Jones, HS, Hewitt, PA, and Sparks, SA. Presence of spotters improves bench press performance: a deception study. J Strength Cond Res XX(X): 000-000, 2017-Resistance exercise is a widely used method of physical training in both recreational exercise and athletic populations. The use of training partners and spotters during resistance exercise is widespread, but little is known about the effect of the presence of these individuals on exercise performance. The purpose of the current study was to investigate the effect of spotter presence on bench press performance. Twelve recreationally trained participants (age, 21.3 ± 0.8 years, height, 1.82 ± 0.1 m, and weight, 84.8 ± 11.1 kg) performed 2 trials of 3 sets to failure at 60% of 1 repetition maximum on separate occasions. The 2 trials consisted of spotters being explicitly present or hidden from view (deception). During the trials, total repetitions (reps), total weight lifted, ratings of perceived exertion (RPE), and self-efficacy were measured. Total reps and weight lifted were significantly greater with spotters (difference = 4.5 reps, t = 5.68, p < 0.001 and difference = 209.6 kg, t = 5.65, p < 0.001, respectively). Although RPE and local RPE were significantly elevated in the deception trials (difference = 0.78, f = 6.16, p = 0.030 and difference = 0.81, f = 5.89, p = 0.034, respectively), self-efficacy was significantly reduced (difference = 1.58, f = 26.90, p < 0.001). This study demonstrates that resistance exercise is improved by the presence of spotters, which is facilitated by reduced RPE and increased self-efficacy. This has important implications for athletes and clients, who should perform resistance exercise in the proximity of others, to maximize total work performed.

  5. Storytelling of organizations on Facebook: interactivity or corporate presence?

    OpenAIRE

    Sixto García, José

    2017-01-01

    Today Facebook is the social network with the most users in the world, 2 billion. Thirteen years after its birth in 2004, it is difficult to understand the organizational communication-public or private- without presence in social networks, so its appearance and subsequent evolution constitute a revolution in the way that brands communicate with public. If Facebook is where the audiences flow and converge, it seems logical that companies also take advantage of this opportunity/strength and tr...

  6. Issues of the presence of parasitic protozoa in surface waters

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    Hawrylik Eliza

    2018-01-01

    This paper focuses on the problem of the presence of parasitic protozoa in surface waters. Characteristics of the most frequently recognized pathogens responsible for water-borne outbreaks were described, as well as sources of contamination and surface waters contamination due to protozoa of the genus Cryptosporidium and Giardia were presented. The methods of destroying the cysts and oocysts of parasitic protozoa used nowadays in the world were also presented in a review.

  7. The difference between presence-based education and distance learning

    OpenAIRE

    Fernández Rodríguez, Mònica

    2002-01-01

    Attempts to define distance learning always involve comparisons with presence-based education, as the latter is the most direct reference that the former has. It is on this basis that the convergent points, similarities and differences of the two types of approach are established. This article opens with such a comparison, before going on to focus mainly on distance learning and to examine methodological strategies that should be borne in mind when implementing an e-learning system.

  8. Electron scattering in the presence of an intense electromagnetic field

    International Nuclear Information System (INIS)

    Mohan, M.; Chand, P.

    1977-03-01

    The general theory of electron scattering in the presence of an external electromagnetic field, provided by an intense laser beam, accompanied by absorption of n photons, each with energy hω, is discussed. The calculation leads to many summations over intermediate states. A general method for exactly evaluating several sums is described in detail. Numerical results show that the cross-section varies with intensity in a power law fashion

  9. [Husband's presence at childbirth in light of obstetric psychoprophylaxis].

    Science.gov (United States)

    Sioma-Markowska, Urszula; Sipiński, Adam; Majerczyk, Iwona; Selwet, Monika; Kuna, Anna; Machura, Mariola

    2004-01-01

    Contemporary obstetric psychoprophylaxis gives prospective parents wide opportunities to prepare to the pregnancy period and delivery. It is educationally-minded and points the importance to modify the life style, introduces exercises accompanied by the relative during the pregnancy and delivery. The survey portrays husband's--child father's role in obstetric psychoprophylaxis. The importance to continue the psychoprophylaxis in the delivery room was spotted in the survey, too. The continuation might be reached by close relative's presence.

  10. Maternal presence, childrearing practices, and children's response to an injection.

    Science.gov (United States)

    Broome, M E; Endsley, R C

    1989-08-01

    The purpose of the study was to investigate the effects of maternal presence or absence and childrearing practices on young children's response to an injection. One hundred thirty-eight mothers and their children, who were attending health screening clinic, were assigned to one of four groups in which mothers were either present or absent during an interview and an immunization. Mothers were asked to fill out a questionnaire about their childrearing practices. Child behavior was observed during both the interview and the immunization. Results indicated that while maternal presence was associated with the children behaving more distressed during the interview, maternal presence had no effect on child behavior during the immunization. Children whose mothers reported high levels of both control and warmth in their relationship (authoritative parents) were found to be significantly less distressed during the immunization than children of either the low-control, high-warmth (permissive), high-control, low-warmth (authoritarian) or low-control, low-warmth (nonresponsive) parent groups.

  11. Family presence during cardiopulmonary resuscitation and invasive procedures in children

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    Cristiana Araujo G. Ferreira

    2014-03-01

    Full Text Available Objective: To identify literature evidences related to actions to promote family's presence during cardiopulmonary resuscitation and invasive procedures in children hospitalized in pediatric and neonatal critical care units. Data sources : Integrative literature review in PubMed, SciELO and Lilacs databases, from 2002 to 2012, with the following inclusion criteria: research article in Medicine, or Nursing, published in Portuguese, English or Spanish, using the keywords "family", "invasive procedures", "cardiopulmonary resuscitation", "health staff", and "Pediatrics". Articles that did not refer to the presence of the family in cardiopulmonary resuscitation and invasive procedures were excluded. Therefore, 15 articles were analyzed. Data synthesis : Most articles were published in the United States (80%, in Medicine and Nursing (46%, and were surveys (72% with healthcare team members (67% as participants. From the critical analysis, four themes related to the actions to promote family's presence in invasive procedures and cardiopulmonary resuscitation were obtained: a to develop a sensitizing program for healthcare team; b to educate the healthcare team to include the family in these circumstances; c to develop a written institutional policy; d to ensure the attendance of family's needs. Conclusions: Researches on these issues must be encouraged in order to help healthcare team to modify their practice, implementing the principles of the Patient and Family Centered Care model, especially during critical episodes.

  12. Enhanced gasification of wood in the presence of mixed catalysts

    Energy Technology Data Exchange (ETDEWEB)

    Weber, S. L.; Mudge, L. K.; Sealock, Jr., L. J.; Robertus, R. J.; Mitchell, D. E.

    Experimental results obtained in laboratory investigations of steam gasification of wood in the presence of mixed catalysts are presented. These studies are designed to test the technical feasibility of producing specific gaseous products from wood by enhancing its reactivity and product specificity through the use of combined catalysts. The desired products include substitute natural gas, hydrocarbon synthesis gas and ammonia synthesis gas. The gasification reactions are controlled through the use of specific catalyst combinations and operating parameters. A primary alkali carbonate gasification catalyst impregnated into the wood combined with specific commercially available secondary catalysts produced the desired products. A yield of 50 vol % methane was obtained with a randomly mixed combination of a commercial nickel methanation catalyst and silica-alumina cracking catalyst at a weight ratio of 3:1 respectively. Steam gasification of wood in the presence of a commercial Si-Al cracking catalyst produced the desired hydrocarbon synthesis gas. Hydrogen-to-carbon monoxide ratios needed for Fischer-Tropsch synthesis of hydrocarbons were obtained with this catalyst system. A hydrogen-to-nitrogen ratio of 3:1 for ammonia synthesis gas was achieved with steam-air gasification of wood in the presence of catalysts. The most effective secondary catalyst system employed to produce the ammonia synthesis gas included two commercially prepared catalysts formulated to promote the water-gas shift reaction.

  13. Compassionate presence: The meaning of hematopoietic stem cell transplant nursing.

    Science.gov (United States)

    Sabo, Brenda M

    2011-04-01

    Within oncology, working with patients who are suffering or at end-of-life has been recognized repeatedly as stress-inducing, yet there is little agreement on what specifically nurses may experience as a result of their work. Further, research focused on caring work within the context of hematopoietic stem cell transplant (HSCT) nursing is almost non-existent. In light of the gap, this interpretative phenomenological study focused on enhancing the knowledge and understanding of the effect(s) of nursing work on the psychosocial health and well being of HSCT nurses. An interpretative phenomenological design grounded in the work of Heidegger and van Manen was used to explore nursing work among HSCT nurses. Twelve nurses from three Canadian tertiary healthcare facilities participated in multiple interviews and focus groups. Thematic analysis resulted in the emergence of four core themes and one overarching novel theme, compassionate presence. The discussion provides an overview of the novel finding, compassionate presence, which challenges the notion that working with individuals who are suffering or at end-of-life inevitably leads to adverse psychosocial effects. Implications for practice, education and research are also provided. Compassionate presence emerged to suggest a potential buffering effect against adverse consequences of HSCT nursing work. This finding underscored the value of the relationship as an integral component of nursing work. Copyright © 2010 Elsevier Ltd. All rights reserved.

  14. DECONSTRUCTION OF THE METAPHYSICS OF PRESENCE IN PHENOMENOLOGY AND STRUCTURALISM

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    A. A. Polivoda

    2017-06-01

    Full Text Available Purpose of the work is a description of critical position of J. Derrida on metaphysics of presence in phenomenological and structuralist discourses. As a philosophical strategy, deconstruction tries to destroy a violent hierarchy of terms, in which one term dominates the other according to its ontological or rational sense. Methodology of research is based on J. Derrida’s strategy of deconstruction, which tries to undermine the basic principles of knowledge and Western philosophy existence, for example, the opposition between nature and culture. In terms of J. Derrida, to deconstruct Western philosophy means to explore the tensions and contradictions in text, which should clarify false reliability of accepted hierarchies. The originality of the work lies in the identification of metaphysic of presence problem in structuralist and phenomenological discourses through the deconstruction project. Deconstruction should show instability of logocentrism, which focuses on repression of writing in terms of thought, truth, reason or logic. Conclusions: J. Derrida’s deconstruction appeared as an attempt to overthrow metaphysics and get focused on the concept of writing, which scope is limited by discourse. Deconstruction of metaphysics of presence is a continuous request of legitimacy of the existing logocentrism, and search of its weaknesses, aporias and contradictions, which make impossible the tradition, centered around mind.

  15. Preoperative parental information and parents' presence at induction of anaesthesia.

    Science.gov (United States)

    Astuto, M; Rosano, G; Rizzo, G; Disma, N; Raciti, L; Sciuto, O

    2006-06-01

    Preoperative preparation of paediatric patients and their environment in order to prevent anxiety is an important issue in paediatric anaesthesia. Anxiety in paediatric patients may lead to immediate negative postoperative responses. When a child undergoes surgery, information about the child's anaesthesia must be provided to parents who are responsible for making informed choices about healthcare on their child's behalf. A combination of written, pictorial, and verbal information would improve the process of informed consent. The issue of parental presence during induction of anaesthesia has been a controversial topic for many years. Potential benefits from parental presence at induction include reducing or avoiding the fear and anxiety that might occur in both the child and its parents, reducing the need for preoperative sedatives, and improving the child's compliance even if other studies showed no effects on the anxiety and satisfaction level. The presence of other figures such as clowns in the operating room, together with one of the child's parents, is an effective intervention for managing child and parent anxiety during the preoperative period.

  16. Modulating presence and impulsiveness by external stimulation of the brain

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    Baumgartner Thomas

    2008-08-01

    Full Text Available Abstract Background "The feeling of being there" is one possible way to describe the phenomenon of feeling present in a virtual environment and to act as if this environment is real. One brain area, which is hypothesized to be critically involved in modulating this feeling (also called presence is the dorso-lateral prefrontal cortex (dlPFC, an area also associated with the control of impulsive behavior. Methods In our experiment we applied transcranial direct current stimulation (tDCS to the right dlPFC in order to modulate the experience of presence while watching a virtual roller coaster ride. During the ride we also registered electro-dermal activity. Subjects also performed a test measuring impulsiveness and answered a questionnaire about their presence feeling while they were exposed to the virtual roller coaster scenario. Results Application of cathodal tDCS to the right dlPFC while subjects were exposed to a virtual roller coaster scenario modulates the electrodermal response to the virtual reality stimulus. In addition, measures reflecting impulsiveness were also modulated by application of cathodal tDCS to the right dlPFC. Conclusion Modulating the activation with the right dlPFC results in substantial changes in responses of the vegetative nervous system and changed impulsiveness. The effects can be explained by theories discussing the top-down influence of the right dlPFC on the "impulsive system".

  17. Presence and HRCT quantification of bronchiectasis in coal workers

    Energy Technology Data Exchange (ETDEWEB)

    Altin, R.; Savranlar, A.; Kart, L.; Mahmutyazicioglu, K.; Ozdemir, H.; Akdag, B.; Gundogdu, S. [Zonguldak Karalmas University, Zonguldak (Turkey). Dept. of Pulmonary Medicine

    2004-11-01

    The purpose of this study was to evaluate the presence of bronchiectasis in coal workers with or without coal worker pneumoconiosis (CWT) and to assess the extent of bronchiectasis, severity of bronchial wall dilatation and thickening by high resolution computed tomography (HRCT). The patient group consisted of 78 patients (43 CWP; 35 non-CWP). Pneumoconiosis profusions of CWP workers were between p0/1 and p2/2 according to ILO 1980 chest X-ray classification. HRCT examinations of all subjects were evaluated for the presence, extent, dilatation and thickness of bronchiectasis. The diagnosis of bronchiectasis was put on 19 of 43 CWP (44.1 %) and 7 of 35 non-CWP workers (20.0 %). There were statistically significant differences between bronchiectasis positive and negative coal workers with CWP concerning age and exposure duration (P = 0.012 and 0.009, respectively). Then, multiple logistic regression analysis was performed to define exact risk factors. Exposure duration was only found to be related with presence of bronchiectasis ((odds ratio) OR = 1.494, 95 % confidence interval 1.168-1.912). The data from the present study shows that bronchiectasis is frequent and severe in CWP workers than without. Bronchiectasis is influenced by coal dust exposure. Thus, coal dust protection measures must be controlled efficiently to prevent bronchiectasis in coal workers.

  18. Focusing on variation: methods and applications of the concept of beta diversity in aquatic ecosystems Focando na variação: métodos e aplicações do conceito de diversidade beta em ecossistemas aquáticos

    Directory of Open Access Journals (Sweden)

    Adriano Sanches Melo

    2011-09-01

    Full Text Available Ecologists usually estimate means, but devote much less attention to variation. The study of variation is a key aspect to understand natural systems and to make predictions regarding them. In community ecology, most studies focus on local species diversity (alpha diversity, but only in recent decades have ecologists devoted proper attention to variation in community composition among sites (beta diversity. This is in spite of the fact that the first attempts to estimate beta diversity date back to the pioneering work by Koch and Whittaker in the 1950s. Progress in the last decade has been made in the development both of methods and of hypotheses about the origin and maintenance of variation in community composition. For instance, methods are available to partition total diversity in a region (gamma diversity, in a local component (alpha, and several beta diversities, each corresponding to one scale in a hierarchy. The popularization of the so-called raw-data approach (based on partial constrained ordination techniques and the distance-based approach (based on correlation of dissimilarity/distance matrices have allowed many ecologists to address current hypotheses about beta diversity patterns. Overall, these hypotheses are based on niche and neutral theory, accounting for the relative roles of environmental and spatial processes (or a combination of them in shaping metacommunities. Recent studies have addressed these issues on a variety of spatial and temporal scales, habitats and taxonomic groups. Moreover, life history and functional traits of species such as dispersal abilities and rarity have begun to be considered in studies of beta diversity. In this article we briefly review some of these new tools and approaches developed in recent years, and illustrate them by using case studies in aquatic ecosystems.Ecólogos geralmente estimam médias, mas dedicam pouca atenção à variação. O estudo da variação é um aspecto chave para entender

  19. A integração da pesquisa ao conhecimento ecológico local no subsídio ao manejo: variações no estoque natural da ostra de mangue crassostrea spp. na reserva extrativista do Mandira, Cananéia-SP, Brasil

    Directory of Open Access Journals (Sweden)

    Ingrid Cabral Machado

    2011-06-01

    Full Text Available Este estudo teve o objetivo de descrever uma experiência de integração entre conhecimento científico e comunitário no subsídio ao manejo, a partir das avaliações do estoque da ostra de mangue Crassostrea spp. na Reserva Extrativista do Mandira, baseadas em estudos populacionais e no Conhecimento Ecológico Local (CEL e percepção da comunidade. Os dados dos estudos populacionais apresentaram aspectos concordantes com o Conhecimento Ecológico Local, evidenciando variações no estoque de ostras na Reserva.This study aimed to illustrate the experience of integration between scientific knowledge and Local Ecological Knowledge to subside management from the assessments of the mangrove oyster stock in the Mandira Extractive Reserve, based on population studies and on local ecological knowledge and perception of the community. Data from population studies showed features consistent with the Local Ecological Knowledge, providing evidence of variations in the stock of oysters in the Mandira Extractive Reserve.

  20. Efeitos de variações cambiais em uma abordagem de dinâmica de mudança estrutural à teoria do crescimento restrito pelo balanço de pagamentos The effects of exchange rate variations in a structural economic dynamic approach to the balance of payment constrained growth theory

    Directory of Open Access Journals (Sweden)

    Ricardo Azevedo Araujo

    2012-12-01

    Full Text Available Neste trabalho, mostra-se que variações once-for-all do nível da taxa de câmbio podem desempenhar um papel importante na composição setorial da economia e tal fato tem implicações importantes em termos de uma versão desagregada da Lei de Thirlwall mesmo diante do argumento da insignificância quantitativa dos movimentos de preços relativos. Mostra-se, então, que a taxa de crescimento de um país compatível com o equilíbrio no balanço de pagamentos pode ser afetada por movimentos do nível de taxas de câmbio nominal e o conceito de uma taxa de câmbio natural é introduzida.In this paper it is shown that once-for-all variations at the level of the exchange rate can play an important role in the sectoral composition of the economy. This fact has important implications in terms of a disaggregated version of Thirlwall's law, even when the argument of the quantitative unimportance of relative price movements holds. The growth rate of a country is therefore shown to be affected by once-for-all movements at the level of nominal exchange rates and the concept of a natural exchange rate is introduced.

  1. Variação sazonal das condições internas de colônias de Melipona marginata obscurior Moure, no Rio Grande do Sul, Brasil Seasonal variations in the internal condictions of colonies the Melipona marginata obscurior Moure, at Rio Grande do Sul, Brazil

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    Francine Von B. Borges

    2006-09-01

    Full Text Available O conhecimento das condições internas das colônias de Melipona marginata obscurior Moure, 1971, ao longo do ano, é importante para a compreensão do comportamento das abelhas sem ferrão e seu manejo. Visa-se o estudo da biologia de M. marginata obscurior em ambiente natural, com ênfase na variação sazonal das condições internas das colônias. Quatro colônias foram estudadas no Centro de Pesquisas e Conservação da Natureza Pró-Mata, em São Francisco de Paula, RS. Avaliou-se o volume dos ninhos, a ocorrência e duração da diapausa e o número total de favos e de células de cria nos dois últimos favos. O volume do invólucro inicial das quatro colônias foi semelhante, variando de 2,26 a 2,69 litros. Ao final da avaliação observou-se que o volume do invólucro da colônia A reduziu 5%, enquanto as demais cresceram 61% (colônia B, 84% (C e 71% (D. A partir do monitoramento mensal dos favos de cria constatou-se a ocorrência de diapausa em três colônias (B, C e D enquanto a colônia A permaneceu com postura ininterruptamente. As colônias cessaram a construção de células de cria e postura da rainha durante o outono e reiniciaram esta atividade no final do inverno. Sugere-se que a variação do período de diapausa (8 a 23 semanas seja determinada por fatores internos das colônias. O número máximo de favos registrado durante a primavera e o verão variou de 6 a 8, enquanto que o número estimado de células de cria dos dois últimos favos variou de 116 a 1190. Foi possível reconhecer padrões, bem como variações sazonais, relacionados ao volume do invólucro dos ninhos, à ocorrência de diapausa e ao número de favos e de células de cria nos dois últimos favos. Variações sazonais das condições internas entre as colônias mostraram-se evidentes e podem ser creditadas a características intrínsecas das colônias.The knowledge of the internal conditions of Melipona marginata obscurior Moure, 1971 colonies, through

  2. Una visión sucinta de la enseñanza de la medicina a través de la historia: II. Colombia, un sitio donde confluyeron varias culturas con su arte de curar = A succinct vision of medical teaching throughout history: II. Colombia, a place where different cultures came together with their art of healing

    Directory of Open Access Journals (Sweden)

    Díaz Hernández, Diana Patricia

    2011-06-01

    Full Text Available Para comprender cómo se ha enseñado la medicina a través de los tiempos, es necesario apoyarse en los historiadores que han tratado su evolución y, a partir de ellos, indagar sobre las actitudes de los médicos en su posición como docentes y acerca de cómo era la apropiación del conocimiento en cada época por parte de los estudiantes. En este segundo artículo se presenta una visión sucinta de la enseñanza de la medicina en Colombia en diferentes épocas, empezando con la Conquista Española cuando se encontraron varias culturas, la española y las aborígenes, con sus respectivas tradiciones en el arte de curar y en la forma de enseñarlo; se incluyen también la llegada de la enseñanza de la medicina a la universidad colombiana y la actual propuesta curricular de la Facultad de Medicina de la Universidad de Antioquia.

  3. Neutrophils Release Metalloproteinases during Adhesion in the Presence of Insulin, but Cathepsin G in the Presence of Glucagon

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    Natalia V. Fedorova

    2018-01-01

    Full Text Available In patients with reperfusion after ischemia and early development of diabetes, neutrophils can attach to blood vessel walls and release their aggressive bactericide agents, which damage the vascular walls. Insulin and 17β-estradiol (E2 relieve the vascular complications observed in metabolic disorders. In contrast, glucagon plays an essential role in the pathophysiology of diabetes. We studied the effect of hormones on neutrophil secretion during adhesion to fibronectin. Amino acid analysis revealed that proteins secreted by neutrophils are characterized by a stable amino acid profile enriched with glutamate, leucine, lysine, and arginine. The total amount of secreted proteins defined as the sum of detected amino acids was increased in the presence of insulin and reduced in the presence of glucagon. E2 did not affect the amount of protein secretion. Proteome analysis showed that in the presence of insulin and E2, neutrophils secreted metalloproteinases MMP-9 and MMP-8 playing a key role in modulation of the extracellular matrix. In contrast, glucagon induced the secretion of cathepsin G, a key bactericide protease of neutrophils. Cathepsin G can promote the development of vascular complications because of its proinflammatory activity and ability to stimulate neutrophil adhesion via the proteolysis of surface receptors.

  4. Social Presence in the Web-based Synchronous Secondary Classroom

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    Eric Nippard

    2007-02-01

    Full Text Available he purpose of the study reported on in this paper was to explore how teachers and students manifest social presence in the web-based synchronous secondary classroom (WBSSC. Data were collected using structured and unstructured observations of twelve online recordings of web-based synchronous classes in the province of Newfoundland and Labrador, Canada. Structured observations were guided by an instrument developed by Rourke, Anderson, Garrison and Archer (2001 for identifying and measuring social presence in an online context. Findings revealed that teachers and students relied on different tools when providing affective, interactive and cohesive responses related to social presence. Manifestations of social presence by the teachers occurred through use of two-way audio whereas students relied on text-based Direct Messaging. Expressions of social presence by the students and teachers occurred most often in a context of digressions that drew attention away from the delivery of content. In addition, students demonstrated social presence using discourse conventions transferred from informal social contexts of instant messaging such as ICQ and MSN. Résumé : L’objet de la présente étude consistait à examiner de quelle façon les enseignants et les étudiants font preuve de présence sociale dans les salles de classe synchrones en ligne du secondaire. Des données ont été recueillies au moyen d’observations structurées et non structurées provenant de douze enregistrements en ligne de classes synchrones accessibles par Internet dans la province de Terre-Neuve et Labrador, Canada. Les observations structurées ont été dirigées au moyen d’un instrument développé par Rourke, Anderson, Garrison, et Archer (2001 afin d’identifier et de mesurer la présence sociale en ligne. Les résultats démontrent que les enseignants et les élèves utilisent des outils différents pour offrir des réponses affectives, interactives et homogènes li

  5. Parental presence or absence during paediatric burn wound care procedures.

    Science.gov (United States)

    Egberts, Marthe R; de Jong, Alette E E; Hofland, Helma W C; Geenen, Rinie; Van Loey, Nancy E E

    2017-12-18

    Differing views on benefits and disadvantages of parental presence during their child's wound care after burn injury leave the topic surrounded by controversies. This study aimed to describe and explain parents' experiences of their presence or absence during wound care. Shortly after the burn event, 22 semi-structured interviews were conducted with parents of children (0-16 years old) that underwent hospitalization in one of the three Dutch burn centers. Eighteen of these parents also participated in follow-up interviews three to six months after discharge. Interviews were analyzed using grounded theory methodology. Analyses resulted in themes that were integrated into a model, summarizing key aspects of parental presence during wound care. These aspects include parental cognitions and emotions (e.g., shared distress during wound care), parental abilities and needs (e.g., controlling own emotions, being responsive, and gaining overall control) and the role of burn care professionals. Findings emphasize the distressing nature of wound care procedures. Despite the distress, parents expressed their preference to be present. The abilities to control their own emotions and to be responsive to the child's needs were considered beneficial for both the child and the parent. Importantly, being present increased a sense of control in parents that helped them to cope with the situation. For parents not present, the professional was the intermediary to provide information about the healing process that helped parents to deal with the situation. In sum, the proposed model provides avenues for professionals to assess parents' abilities and needs on a daily basis and to adequately support the child and parent during wound care. Copyright © 2017 Elsevier Ltd and ISBI. All rights reserved.

  6. Presence of Bacteria in Spontaneous Achilles Tendon Ruptures.

    Science.gov (United States)

    Rolf, Christer G; Fu, Sai-Chuen; Hopkins, Chelsea; Luan, Ju; Ip, Margaret; Yung, Shu-Hang; Friman, Göran; Qin, Ling; Chan, Kai-Ming

    2017-07-01

    The structural pathology of Achilles tendon (AT) ruptures resembles tendinopathy, but the causes remain unknown. Recently, a number of diseases were found to be attributed to bacterial infections, resulting in low-grade inflammation and progressive matrix disturbance. The authors speculate that spontaneous AT ruptures may also be influenced by the presence of bacteria. Bacteria are present in ruptured ATs but not in healthy tendons. Cross-sectional study; Level of evidence, 3. Patients with spontaneous AT ruptures and patients undergoing anterior cruciate ligament (ACL) reconstruction were recruited for this study. During AT surgical repair, excised tendinopathic tissue was collected, and healthy tendon samples were obtained as controls from hamstring tendon grafts used in ACL reconstruction. Half of every sample was reserved for DNA extraction and the other half for histology. Polymerase chain reaction (PCR) was conducted using 16S rRNA gene universal primers, and the PCR products were sequenced for the identification of bacterial species. A histological examination was performed to compare tendinopathic changes in the case and control samples. Five of 20 AT rupture samples were positive for the presence of bacterial DNA, while none of the 23 hamstring tendon samples were positive. Sterile operating and experimental conditions and tests on samples, controlling for harvesting and processing procedures, ruled out the chance of postoperative bacterial contamination. The species identified predominantly belonged to the Staphylococcus genus. AT rupture samples exhibited histopathological features characteristic of tendinopathy, and most healthy hamstring tendon samples displayed normal tendon features. There were no apparent differences in histopathology between the bacterial DNA-positive and bacterial DNA-negative AT rupture samples. The authors have demonstrated the presence of bacterial DNA in ruptured AT samples. It may suggest the potential involvement of bacteria

  7. Presence and HRCT quantification of bronchiectasis in coal workers

    International Nuclear Information System (INIS)

    Altin, Remzi; Savranlar, Ahmet; Kart, Levent; Mahmutyazicioglu, Kamran; Ozdemir, Huseyin; Akdag, Beyza; Gundogdu, Sadi

    2004-01-01

    Purpose: The purpose of this study was to evaluate the presence of bronchiectasis in coal workers with or without coal worker pneumoconiosis (CWP) and to assess the extent of bronchiectasis, severity of bronchial wall dilatation and thickening by high resolution computed tomography (HRCT). Materials and methods: The retrospective study consisted of HRCT archives of 93 coal workers. The coal workers with previous diagnosis of COPD (six), asthma (one) and tuberculosis (three) were excluded. Five coal workers with progressive massive fibrosis were not included into the study. The resulting patient group consisted of 78 patients (43 CWP; 35 non-CWP). Pneumoconiosis profusions of CWP workers were between p0/1 and p2/2 according to ILO 1980 chest X-ray classification. HRCT examinations of all subjects were evaluated for the presence, extent, dilatation and thickness of bronchiectasis. Analysis of extent, dilatation and thickness were performed according to established criteria. Results: The diagnosis of bronchiectasis was put on 19 of 43 CWP (44.1%) and 7 of 35 non-CWP workers (20.0%). There were statistically significant differences between bronchiectasis positive and negative coal workers with CWP concerning age and exposure duration (P = 0.012 and 0.009, respectively). Then, multiple logistic regression analysis was performed to define exact risk factors. Exposure duration was only found to be related with presence of bronchiectasis [(odds ratio) OR = 1.494, 95% confidence interval 1.168-1.912]. Conclusions: The data from the present study shows that bronchiectasis is frequent and severe in CWP workers than without. Bronchiectasis is influenced by coal dust exposure. Thus, coal dust protection measures must be controlled efficiently to prevent bronchiectasis in coal workers

  8. Towards a sensor for detecting human presence and activity

    OpenAIRE

    Benezeth , Yannick; Laurent , Hélène; Emile , Bruno; Rosenberger , Christophe

    2011-01-01

    International audience; In this paper, we propose a vision-based system for human detection and tracking in indoor environment allowing to collect higher level information on people activity. The developed presence sensor based on video analysis, using a static camera is ¯rst of all presented. Composed of three main steps, the ¯rst one consists in change detection using a background model updated at di®erent levels to manage the most common variations of the environment. A moving objects trac...

  9. Enhancing the online presence of a dental practice.

    Science.gov (United States)

    McLeod, Neil S

    2012-04-01

    This article describes methods for enhancing the online presence of a dental practice to gain market share and facilitate communication with current and prospective patients. Topics discussed include creation of a website that will help patients easily locate the practice. The importance of back links and embedded keywords is stressed. A method for identifying competitors' online marketing strategies also is presented, along with discussions of patient reviews and pay-per-click advertising options. Copyright © 2012 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.

  10. Reactivity of hydrogen with uranium in the presence of Pt

    International Nuclear Information System (INIS)

    Balooch, M.; Siekhaus, W.J.

    1997-07-01

    The surface-reaction of di-hydrogen with uranium in the presence of Pt clusters has been studied using scanning tunneling microscopy (STM). Uranium was deposited on highly oriented pyrolytic graphite (HOPG) and annealed at temperatures up to 1200 degrees C to obtain atomically pyrolytic flat surfaces. Pt clusters were then formed using evaporation from a Pt source onto the surface and subsequent annealing. Hydrogen mainly attacked uranium in the vicinity of Pt clusters and formed hydride. The hydride formation probability is almost constant at 2.3x10 -4 over the range of exposures studied

  11. Chlorination of niobium oxide in the presence of carbon monoxide

    International Nuclear Information System (INIS)

    Freitas, L.R. de

    1984-01-01

    The chlorination kinetics of niobium pentoxide in the presence of carbon monoxide between 500-800 0 C of temperature is studied. The following variable that influences on the reaction rate are analysed: gas flow, geometry and volume of the Nb 2 O 5 samples, reaction temperature and composition of the chlorinated mixture. At the same time, two other materials were studied: the CaO.Nb 2 O 5 (synthetized in laboratory) and pyrochlorine concentrates. The three materials are compared for the chlorination method used. (M.A.C.) [pt

  12. Factoring the dispersion relation in the presence of Lorentz violation

    International Nuclear Information System (INIS)

    Colladay, Don; McDonald, Patrick; Mullins, David

    2010-01-01

    We produce an explicit formula for the dispersion relation for the Dirac equation in the standard model extension in the presence of Lorentz violation. Our expression is obtained using novel techniques which exploit the algebra of quaternions. The dispersion relation is found to conveniently factor in two special cases that each involve a mutually exclusive set of nonvanishing Lorentz-violating parameters. This suggests that a useful approach to studies of Lorentz-violating models is to split the parameter space into two separate pieces, each of which yields a simple, tractable dispersion relation that can be used for analysis.

  13. Lower hybrid current drive in the presence of electric field

    Directory of Open Access Journals (Sweden)

    Saveliev Alexander

    2017-01-01

    Full Text Available A new one-dimensional approach to the lower hybrid current drive (LHCD modelling in the presence of an inductive electric field is suggested in this paper. The approach is based on using time-dependent solutions of a well-known Fokker-Planck equation for the distribution function of fast electrons calculated concurrently with solving plasma transport equation in the Automated System for TRansport Analysis (ASTRA [1]. A good agreement between experimental and modelling results is demonstrated for an FT-2 [2] plasma shot. Also new formulae for the steady-state solution of this kinetic equation are found.

  14. Process and apparatus for detecting presence of plant substances

    International Nuclear Information System (INIS)

    Kirby, J.A.

    1991-01-01

    This patent describes an apparatus and process for detecting the presence of plant substances in a particular environment. It comprises: measuring the background K40 gamma ray radiation level in a particular environment with a 1.46 MeV gamma ray counter system; measuring the amount of K40 gamma ray radiation emanating from a package containing a plant substance being passed through an environment with a counter; and generating an alarm signal when the total K40 gamma ray radiation reaches a predetermined level over and above the background level

  15. National oil companies' presence to hike US refining competition

    International Nuclear Information System (INIS)

    Anon.

    1992-01-01

    This paper reports that the downstream segment of the U.S. petroleum business is virtually certain to become more competitive because of the growing presence of national oil companies in the country's refining industry. That's a forecast by New York investment firm Kidder Peabody. It cites a plan by Mexico's Petroleos Mexicanos (Pemex) to form a joint venture with Shell Oil Co. covering Shell's 225,000 b/d Deer Park, Tex., refinery as the latest example of national oil companies' movement into U.S. refining

  16. Bremsstrahlung in the presence of a laser field

    International Nuclear Information System (INIS)

    Dondera, M.; Florescu, Viorica

    2006-01-01

    For the process of spontaneous one photon emission by an electron scattered on a potential in the presence of a monochromatic laser field, we review the formalism and the approximations on which the existing nonrelativistic calculations are based, in classical and quantum descriptions. In the case of the Coulomb potential, we give new numerical results for the radiation spectrum, using either the Born approximation [Karapetyan, P.V., Fedorov, M.V., 1978. Spontaneous electron bremmstrahlung in the field of an intense electromagnetic wave. Zh. Teor. Fiz. 75, 816-826 [Sov. Phys. JETP 48, 412 (1979)

  17. Detection of person presence and its activity in the bathtub

    International Nuclear Information System (INIS)

    Bujnowski, Adam; Palinski, Arkadiusz; Koscinski, Piotr; Skalski, Lukasz; Skurczynska, Anna; Wtorek, Jerzy

    2013-01-01

    A practical application of a bioimpedance technique for a detection of a bathing person is presented in the paper. It addresses the possibility of supervising people in the bathtub without voiding of their intimacy. The measurement system installed in a fiber-glass or a plastic bathtub is able to detect a presence of the bathing person, to estimate its activity and thus to detect potentially dangerous events. In the paper a principle of measurement, working prototype and measurements are presented. The proposed method can be useful for supporting and supervising bathing of elders, partially disabled or people with some health state risk during the bath and living alone.

  18. Theatre of Presence - Antero Alli's Paratheatrical ReSearch Lab

    DEFF Research Database (Denmark)

    Isar, Nicoletta

    the oppression, decadence and corruption that has crucified and buried the poetic Imagination" (Antero Alli) This paper will try to unveil one of Antero Alli's paratheatrical experiments in overcoming the death of ritual in theatre. Orphans of Delirium is an intense, living ritual experience, "fluid" in its...... do not repeat ritual patterns but create them, bringing shots of presence into theatre by a dynamic and constant process of opening toward the vertical "sources." Nicoletta Isar is Associate professor at the Institute of Art History of Copenhagen University. Her main research is focused...

  19. Treating the thyroid in the presence of Graves' ophthalmopathy

    DEFF Research Database (Denmark)

    Hegedüs, Laszlo; Bonnema, Steen J; Smith, Terry J

    2012-01-01

    The etiology of Graves' orbitopathy (GO) remains enigmatic. Optimal therapeutic choices for the hyperthyroidism associated with Graves' disease (GD) in the presence of GO remain controversial. Whether antithyroid drugs (ATDs), radioiodine (RAI), or thyroidectomy should be favored in such patients...... - independent of extent - do not influence the natural course of GO. RAI can cause de novo development or progression of GO, which is largely preventable with oral steroid prophylaxis. In patients with mild GO, the thyroid treatment is largely independent of GO. Moderate to severe GO should be treated promptly...

  20. Lower hybrid current drive in the presence of electric field

    Science.gov (United States)

    Saveliev, Alexander; Zakharov, Vladimir

    2017-10-01

    A new one-dimensional approach to the lower hybrid current drive (LHCD) modelling in the presence of an inductive electric field is suggested in this paper. The approach is based on using time-dependent solutions of a well-known Fokker-Planck equation for the distribution function of fast electrons calculated concurrently with solving plasma transport equation in the Automated System for TRansport Analysis (ASTRA) [1]. A good agreement between experimental and modelling results is demonstrated for an FT-2 [2] plasma shot. Also new formulae for the steady-state solution of this kinetic equation are found.

  1. Dynamic modeling of presence of occupants using inhomogeneous Markov chains

    DEFF Research Database (Denmark)

    Andersen, Philip Hvidthøft Delff; Iversen, Anne; Madsen, Henrik

    2014-01-01

    on time of day, and by use of a filter of the observations it is able to capture per-employee sequence dynamics. Simulations using this method are compared with simulations using homogeneous Markov chains and show far better ability to reproduce key properties of the data. The method is based...... on inhomogeneous Markov chains with where the transition probabilities are estimated using generalized linear models with polynomials, B-splines, and a filter of passed observations as inputs. For treating the dispersion of the data series, a hierarchical model structure is used where one model is for low presence...

  2. Electrochemical reduction of nitrate in the presence of an amide

    Science.gov (United States)

    Dziewinski, Jacek J.; Marczak, Stanislaw

    2002-01-01

    The electrochemical reduction of nitrates in aqueous solutions thereof in the presence of amides to gaseous nitrogen (N.sub.2) is described. Generally, electrochemical reduction of NO.sub.3 proceeds stepwise, from NO.sub.3 to N.sub.2, and subsequently in several consecutive steps to ammonia (NH.sub.3) as a final product. Addition of at least one amide to the solution being electrolyzed suppresses ammonia generation, since suitable amides react with NO.sub.2 to generate N.sub.2. This permits nitrate reduction to gaseous nitrogen to proceed by electrolysis. Suitable amides include urea, sulfamic acid, formamide, and acetamide.

  3. Hydrogen atoms in the presence of a homogeneous magnetic field

    International Nuclear Information System (INIS)

    Brandi, H.S.; Koiller, B.

    1978-01-01

    A variational scheme to obtain the spectrum of the hydrogen atom in the presence of an external homogeneous magnetic field is proposed. Two different sets of basis function to diagonalize the Hamiltonian describing the system are used, namely the eigenfunctions of the free hydrogen atom and of the three-dimensional harmonic oscillator; both having their radial coordinates properly scaled by a variational parammeter. Because of its characteristics, the present approach is suitable to describe the ground state as well as an infinite number of excited states also for a wide range of magnetic field strengths [pt

  4. Girls, until a boy says the opposite: language and presence

    OpenAIRE

    Izquierdo, Catalina; Rosano, Santiago

    2017-01-01

    This work is a reflection on the relationship between the use of language and presence. The guidelines given by the Royal Spanish Academy, which advocatesthe use of male generically, are questioned. It seems that being a girl is possible  as long as there is not a boy present, at that time her feminine identity is invisible. The rules of the Royal Academy, made from a vision of purely linguistic language, are refuted by several authors who argue that the language has a strong ideological char...

  5. Drug accumulation in the presence of the multidrug resistance pump

    DEFF Research Database (Denmark)

    Ayesh, S; Litman, Thomas; Stein, W D

    1997-01-01

    We studied the interaction between the multidrug transporter, P-glycoprotein, and two compounds that interact with it: vinblastine, a classical substrate of the pump, and verapamil, a classical reverser. Steady-state levels of accumulation of these two drugs were determined in a multidrug resistant...... P388 leukemia cell line, P388/ADR. The time course of accumulation of these drugs, and the effect of energy starvation and the presence of chloroquine on the level of their steady-state accumulation were quite disparate. Vinblastine inhibited the accumulation of verapamil whereas it enhanced...

  6. Bremsstrahlung in the presence of a laser field

    Energy Technology Data Exchange (ETDEWEB)

    Dondera, M. [Department of Physics, University of Bucharest, Bucharest-Magurele MG11, 76900 (Romania); Florescu, Viorica [Department of Physics, University of Bucharest, Bucharest-Magurele MG11, 76900 (Romania)]. E-mail: flor@barutu.fizica.unibuc.ro

    2006-10-15

    For the process of spontaneous one photon emission by an electron scattered on a potential in the presence of a monochromatic laser field, we review the formalism and the approximations on which the existing nonrelativistic calculations are based, in classical and quantum descriptions. In the case of the Coulomb potential, we give new numerical results for the radiation spectrum, using either the Born approximation [Karapetyan, P.V., Fedorov, M.V., 1978. Spontaneous electron bremmstrahlung in the field of an intense electromagnetic wave. Zh. Teor. Fiz. 75, 816-826 [Sov. Phys. JETP 48, 412 (1979)

  7. Ideal solar cell equation in the presence of photon recycling

    International Nuclear Information System (INIS)

    Lan, Dongchen; Green, Martin A.

    2014-01-01

    Previous derivations of the ideal solar cell equation based on Shockley's p-n junction diode theory implicitly assume negligible effects of photon recycling. This paper derives the equation in the presence of photon recycling that modifies the values of dark saturation and light-generated currents, using an approach applicable to arbitrary three-dimensional geometries with arbitrary doping profile and variable band gap. The work also corrects an error in previous work and proves the validity of the reciprocity theorem for charge collection in such a more general case with the previously neglected junction depletion region included

  8. Analysis of computer images in the presence of metals

    Science.gov (United States)

    Buzmakov, Alexey; Ingacheva, Anastasia; Prun, Victor; Nikolaev, Dmitry; Chukalina, Marina; Ferrero, Claudio; Asadchikov, Victor

    2018-04-01

    Artifacts caused by intensely absorbing inclusions are encountered in computed tomography via polychromatic scanning and may obscure or simulate pathologies in medical applications. To improve the quality of reconstruction if high-Z inclusions in presence, previously we proposed and tested with synthetic data an iterative technique with soft penalty mimicking linear inequalities on the photon-starved rays. This note reports a test at the tomographic laboratory set-up at the Institute of Crystallography FSRC "Crystallography and Photonics" RAS in which tomographic scans were successfully made of temporary tooth without inclusion and with Pb inclusion.

  9. Ideal solar cell equation in the presence of photon recycling

    Energy Technology Data Exchange (ETDEWEB)

    Lan, Dongchen, E-mail: d.lan@unsw.edu.au; Green, Martin A., E-mail: m.green@unsw.edu.au [Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052 (Australia)

    2014-11-07

    Previous derivations of the ideal solar cell equation based on Shockley's p-n junction diode theory implicitly assume negligible effects of photon recycling. This paper derives the equation in the presence of photon recycling that modifies the values of dark saturation and light-generated currents, using an approach applicable to arbitrary three-dimensional geometries with arbitrary doping profile and variable band gap. The work also corrects an error in previous work and proves the validity of the reciprocity theorem for charge collection in such a more general case with the previously neglected junction depletion region included.

  10. Ion acoustic double layers in the presence of plasma source

    International Nuclear Information System (INIS)

    Okuda, H.; Ashour-Abdalla, M.

    1982-01-01

    Steady-state plasma turbulence and the formation of negative potential spikes and double layers in the presence of ion acoustic instabilities have been studied by means of one-dimensional particle simulations in which the velocities of a small fraction of electrons are replaced by the initial drifting Maxwellian at a constant rate. A steady state is found where negative potential spikes appear randomly in space and time giving rise to an anomalous resistivity much greater than previously found. Comparisons of the simulation results with laboratory and space plasmas are discussed

  11. Modeling demographic performance of northern spotted owls relative to forest habitat in Oregon

    Science.gov (United States)

    Olson, Gail S.; Glenn, Elizabeth M.; Anthony, Robert G.; Forsman, Eric D.; Reid, Janice A.; Loschl, Peter J.; Ripple, William J.

    2004-01-01

    Northern spotted owls (Strix occidentalis caurina) are known to be associated with late-successional forests in the Pacific Northwest of the United States, but the effects of habitat on their demographic performance are relatively unknown. We developed statistical models relating owl survival and productivity to forest cover types within the Roseburg Study Area in the Oregon Coast Range of Oregon, USA. We further combined these demographic parameters using a Leslie-type matrix to obtain an estimate of habitat fitness potential for each owl territory (n = 94). We used mark–recapture methods to develop models for survival and linear mixed models for productivity. We measured forest composition and landscape patterns at 3 landscape scales centered on nest and activity sites within owl territories using an aerial photo-based map and a Geographic Information System (GIS). We also considered additional covariates such as age, sex, and presence of barred owls (Strix varia), and seasonal climate variables (temperature and precipitation) in our models. We used Akaike's Information Criterion (AIC) to rank and compare models. Survival had a quadratic relationship with the amount of late- and mid-seral forests within 1,500 m of nesting centers. Survival also was influenced by the amount of precipitation during the nesting season. Only 16% of the variability in survival was accounted for by our best model, but 85% of this was due to the habitat variable. Reproductive rates fluctuated biennially and were positively related to the amount of edge between late- and mid-seral forests and other habitat classes. Reproductive rates also were influenced by parent age, amount of precipitation during nesting season, and presence of barred owls. Our best model accounted for 84% of the variability in productivity, but only 3% of that was due to the habitat variable. Estimates of habitat fitness potential (which may range from 0 to infinity) for the 94 territories ranged from 0.74 to 1

  12. Presence and Distribution of Tobacco Viruses in Montenegro

    Directory of Open Access Journals (Sweden)

    Jelena Zindović

    2007-01-01

    Full Text Available Seven important tobacco viruses were investigated in Montenegro in 2005: Tobacco Mosaic Virus (TMV, Tomato Spotted Wilt Virus (TSWV, Cucumber Mosaic Virus (CMV, Potato Virus Y (PVY, Alfalfa Mosaic Virus (AMV, Tobacco Ring Spot Virus (TRSV and Potato Virus X(PVX. This investigation included sample collection from four tobacco growing regions in Montenegro and their serological testing by DAS-ELISA test. Presence of different strains of PVY was investigated as well using DAS ELISA test with specific monoclonal antibodies.Serological results proved the presence of four tobacco viruses (TMV, CMV, PVY and AMV, while TSWV, TRSV and PVX were not found in the tested samples of tobacco crops in Montenegro. The results also showed that TMV and CMV were the most frequent (44.6% and 41.5% of tested samples, respectively followed by PVY (15.4% and the least frequent AMV (3.1%. Most samples were infected with one of the examined viruses. In the PVY population found in Montenegro, its necrotic strain (PVYN was absolutely predominant.The results indicated the significance of TMV and CMV concerning tobacco viral infections in Montenegro, as well as a necessity of their detailed characterization at biological and molecular level.

  13. Black holes in the presence of dark energy

    International Nuclear Information System (INIS)

    Babichev, E O; Dokuchaev, V I; Eroshenko, Yu N

    2013-01-01

    The new, rapidly developing field of theoretical research—studies of dark energy interacting with black holes (and, in particular, accreting onto black holes)–—is reviewed. The term 'dark energy' is meant to cover a wide range of field theory models, as well as perfect fluids with various equations of state, including cosmological dark energy. Various accretion models are analyzed in terms of the simplest test field approximation or by allowing back reaction on the black-hole metric. The behavior of various types of dark energy in the vicinity of Schwarzschild and electrically charged black holes is examined. Nontrivial effects due to the presence of dark energy in the black hole vicinity are discussed. In particular, a physical explanation is given of why the black hole mass decreases when phantom energy is being accreted, a process in which the basic energy conditions of the famous theorem of nondecreasing horizon area in classical black holes are violated. The theoretical possibility of a signal escaping from beneath the black hole event horizon is discussed for a number of dark energy models. Finally, the violation of the laws of thermodynamics by black holes in the presence of noncanonical fields is considered. (reviews of topical problems)

  14. Academic voice: On feminism, presence, and objectivity in writing.

    Science.gov (United States)

    Mitchell, Kim M

    2017-10-01

    Academic voice is an oft-discussed, yet variably defined concept, and confusion exists over its meaning, evaluation, and interpretation. This paper will explore perspectives on academic voice and counterarguments to the positivist origins of objectivity in academic writing. While many epistemological and methodological perspectives exist, the feminist literature on voice is explored here as the contrary position. From the feminist perspective, voice is a socially constructed concept that cannot be separated from the experiences, emotions, and identity of the writer and, thus, constitutes a reflection of an author's way of knowing. A case study of how author presence can enhance meaning in text is included. Subjective experience is imperative to a practice involving human interaction. Nursing practice, our intimate involvement in patient's lives, and the nature of our research are not value free. A view is presented that a visible presence of an author in academic writing is relevant to the nursing discipline. The continued valuing of an objective, colorless academic voice has consequences for student writers and the faculty who teach them. Thus, a strategically used multivoiced writing style is warranted. © 2017 John Wiley & Sons Ltd.

  15. Pitting of Incoloy 800 in presence of CuII

    International Nuclear Information System (INIS)

    Bianchi, G.L.; Alvarez, M.G.

    1993-01-01

    The pitting behaviour of Incoloy 800 in presence of Cu II ions, at 60 degrees C and 280 degrees C was studied by long term exposition of specimens in aqueous cupric chloride solutions. At 60 degrees C experiments were performed in aerated (7 ppm O 2 ) and deaerated solutions containing 500, 1000, 2000, 10000 and 20000 ppm CuCl 2 . At 280 degrees C experiments were performed in deaerated 20 ppm, 50 ppm and 100 ppm CuCl 2 solutions. During each experiment the open circuit potential of the alloy was measured as a function of time. After corrosion test the specimens were examined by Scanning Electron Microscopy for the presence of pits. In another set of experiments potentiodynamic anodic polarization curves were used to determine the pitting potential of Incoloy 800 in deaerated NaCl solutions at chloride concentrations and pH values corresponding to those possessed by solutions containing 20 ppm to 20000 ppm CuCl 2 . At 60 degrees C pitting was observed in those solutions where the CuCl 2 concentration is higher than 1000 ppm. At 280 degrees C pitting was found in the specimens exposed to those solutions where the CuCl 2 concentration was higher than 20 ppm. (author). 3 refs

  16. Preparatory power posing affects nonverbal presence and job interview performance.

    Science.gov (United States)

    Cuddy, Amy J C; Wilmuth, Caroline A; Yap, Andy J; Carney, Dana R

    2015-07-01

    The authors tested whether engaging in expansive (vs. contractive) "power poses" before a stressful job interview--preparatory power posing--would enhance performance during the interview. Participants adopted high-power (i.e., expansive, open) poses or low-power (i.e., contractive, closed) poses, and then prepared and delivered a speech to 2 evaluators as part of a mock job interview. All interview speeches were videotaped and coded for overall performance and hireability and for 2 potential mediators: verbal content (e.g., structure, content) and nonverbal presence (e.g., captivating, enthusiastic). As predicted, those who prepared for the job interview with high- (vs. low-) power poses performed better and were more likely to be chosen for hire; this relation was mediated by nonverbal presence, but not by verbal content. Although previous research has focused on how a nonverbal behavior that is enacted during interactions and observed by perceivers affects how those perceivers evaluate and respond to the actor, this experiment focused on how a nonverbal behavior that is enacted before the interaction and unobserved by perceivers affects the actor's performance, which, in turn, affects how perceivers evaluate and respond to the actor. This experiment reveals a theoretically novel and practically informative result that demonstrates the causal relation between preparatory nonverbal behavior and subsequent performance and outcomes. (c) 2015 APA, all rights reserved).

  17. Attenuation of glass dissolution in the presence of natural additives

    Energy Technology Data Exchange (ETDEWEB)

    Sang, Jing C.; Barkatt, Aaron [Department of Chemistry, The Catholic University of America, Washington, DC (United States); O`Keefe, John A. [National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, MD (United States)

    1996-11-01

    The dissolution kinetics of silicate glasses in aqueous environments in systems which included a variety of natural crystalline solids in addition to the glass itself and the aqueous phase are reported. The results demonstrate the possibility of a dramatic decrease in the rate of dissolution of silicate glass in the presence of certain varieties of olivine-based materials. This decrease in dissolution rate was shown to be due to the fact that these additives consist mostly of Mg-based material but also contain minor amounts of Al and Ca. The combined presence of Mg with these minor species affected the corrosion rate of the glass as a whole, including its most soluble components such as boron. This study has potentially important implications to the durability of glasses exposed to natural environments. The results may be relevant to the use of active backfill materials in burial sites for nuclear waste glasses, as well as to better understanding of the environmental degradation of natural and ancient glasses.

  18. Vacuum in the presence of electromagnetic fields and rotating boundaries

    International Nuclear Information System (INIS)

    Manogue, C.A.

    1984-01-01

    Two investigations of the properties of the vacuum are made. The first is a reconsideration of the classic Klein paradox, particle creation due to the presence of very strong external electromagnetic potentials. Expectation values of the current, momentum, and number operators, each of which is a measure of particle creation, are calculated for both massive spin zero and massive spin one half fields. The relationship between super-radiance and pair creation is explained. A review of past work by other authors is included and common conceptual errors are pointed out. The second investigation concerns the rotation of the vacuum caused by the rotation of boundaries. Just as the presence of boundaries can create a change in the vacuum expectation value of the energy density (the Casimir effect), the rotation of such boundaries can create changes in the vacuum expectation value of the momentum density. Calculations of the Casimir effect are made for a massless scalar field confined to an infinitely long square box. The change in the vacuum expectation value of the momentum density is calculated if this same box is rotating around its long central axis. In contrast, it is shown that for an infinitely long circular cylinder there is no change in the momentum density

  19. PRELIMINARY DATA ON FUMONISINS PRESENCE IN PIG LIVER

    Directory of Open Access Journals (Sweden)

    G. Pagliuca

    2009-12-01

    Full Text Available Mycotoxins are heterogeneous chemical compounds characterized by a low molecular weight and synthesized by the secondary metabolism of different molds. Fumonisins are water-soluble mycotoxins produced by Fusarium species spoiling corn and derived products. These mycotoxins can enter the food chain also through the consumption of meat of exposed animals. Fumonisins and their metabolites have been associated with several animal and human diseases. They are suspected risk factors for esophageal and liver cancers, neural tube defects and cardiovascular problems. Improved methods are needed to accurately assess fumonisin concentrations in food from vegetable and animal origin to prevent acute and chronic human exposure. The aim of the present work was to develop a sensitive and selective method for quantification and unambiguous identification of fumonisin B1 (FB1, fumonisin B2 (FB2 and their complete hydrolyzed products (HFB1 and HFB2, in order to determine their presence in pig liver. Furthermore, the developed method was applied, in order to test its efficacy, on liver samples of weaned piglets fed a diet in compliance with the FB1 and FB2 contamination limits set by EU. All the samples showed the presence of at least one of the analytes. In particular FB1 was found in 5 out of 7 samples and the average level of contamination found was 28 ppb.

  20. Female presence and estrous state influence mouse ultrasonic courtship vocalizations.

    Directory of Open Access Journals (Sweden)

    Jessica L Hanson

    Full Text Available The laboratory mouse is an emerging model for context-dependent vocal signaling and reception. Mouse ultrasonic vocalizations are robustly produced in social contexts. In adults, male vocalization during courtship has become a model of interest for signal-receiver interactions. These vocalizations can be grouped into syllable types that are consistently produced by different subspecies and strains of mice. Vocalizations are unique to individuals, vary across development, and depend on social housing conditions. The behavioral significance of different syllable types, including the contexts in which different vocalizations are made and the responses listeners have to different types of vocalizations, is not well understood. We examined the effect of female presence and estrous state on male vocalizations by exploring the use of syllable types and the parameters of syllables during courtship. We also explored correlations between vocalizations and other behaviors. These experimental manipulations produced four main findings: 1 vocalizations varied among males, 2 the production of USVs and an increase in the use of a specific syllable type were temporally related to mounting behavior, 3 the frequency (kHz, bandwidth, and duration of syllables produced by males were influenced by the estrous phase of female partners, and 4 syllable types changed when females were removed. These findings show that mouse ultrasonic courtship vocalizations are sensitive to changes in female phase and presence, further demonstrating the context-sensitivity of these calls.

  1. Equation of state in the presence of gravity

    Science.gov (United States)

    Kim, Hyeong-Chan; Kang, Gungwon

    2016-11-01

    We investigate how an equation of state for matter is affected when a gravity is present. For this purpose, we consider a box of ideal gas in the presence of Newtonian gravity. In addition to the ordinary thermodynamic quantities, a characteristic variable that represents a weight per unit area relative to the average pressure is required in order to describe a macroscopic state of the gas. Although the density and the pressure are not uniform due to the presence of gravity, the ideal gas law itself is satisfied for the thermodynamic quantities when averaged over the system. Assuming that the system follows an adiabatic process further, we obtain a new relation between the averaged pressure and density, which differs from the conventional equation of state for the ideal gas in the absence of gravity. Applying our results to a small volume in a Newtonian star, however, we find that the conventional one is reliable for most astrophysical situations when the characteristic scale is small. On the other hand, gravity effects become significant near the surface of a Newtonian star.

  2. Social Injustice from The Presence of the Bauxite Mining Companies

    Directory of Open Access Journals (Sweden)

    Fatmawati Fatmawati

    2016-06-01

    Full Text Available This study aims to examine the forms of social injustice by the presence of mining companies and local residents in the Tayan Hilir, Sanggau. This study used a qualitative approach accomplished through a descriptive method, and which was then analyzed using qualitative analysis to describe the form of social injustice for society by the presence of mining companies. Results of the study explained that point on begins the social injustice originated from government policies that tend to favor the mining entrepreneurs. With the capital and support of the state, these persons are in superior position to act half “forceful” against the society’s land concessions. On the other hand, society who does not possess the knowledge and power become the injured party. It is based on the reality that occurs when land concessions in Embaloh and Semerah Hamlet (Dusun which were not in accordance with the contractual agreement. Relocation offered by the company was far off and there are no public facilities.

  3. Radiation effects on methane in the presence of molecular sieves

    International Nuclear Information System (INIS)

    Shimizu, Y.; Nagai, S.; Hatada, M.

    1983-01-01

    Product analysis has been carried out for the radiation-induced reaction of methane in the presence of molecular sieves (MS) 3A, 4A, 5A and 13X. Irradiation of methane over MS 4A selectively produces C 2 hydrocarbons, while the use of MS 5A leads to C 2 and C 3 hydrocarbons. The selectivity and yields of these hydrocarbons, however, decrease with irradiation time, owing to deposition of carbonaceous solid produced from methane on the surface of the molecular sieves. The carbonaceous solid is decomposed to low-molecular-weight hydrocarbons when irradiated in an H 2 atmosphere. Material balance estimated for the radiation-chemical reaction of argon containing 2 mol% methane over MS 5A reveals that the carbonaceous solid is highly abundant in carbon atoms. On the other hand the formation of carbonaceous solids plays a less important role in the radiation-chemical reaction of methane in the presence of silica gel, which is found to exhibit greater activity for the formation of hydrocarbons than the molecular sieves. (author)

  4. RESEARCHES REGARDING THE ONLINE PRESENCE OF THE BIHOR COUNTY COMPANIES

    Directory of Open Access Journals (Sweden)

    Mares Marius Daniel

    2012-07-01

    Full Text Available In this paper is presented a survey of companies’ websites in Bihor county. The study aims at local companies whose scope of activity allows them to interact with the end-users – individuals and whose presence in the virtual environment is ensured by websites. Companies that own a website use it for different purposes: to communicate to the users information about the company, to promote its products and services offered, to offer potential clients the opportunity to purchase these products online, to interact with their clients. The website of a company ensure its constant presence and can be used as an instrument in the marketing strategy, as a meaning of identity development or growth of the brand exposure, as a support for relationships with potential buyers or as a way of achieving market research. But for the website to fulfill the purpose for which it was made it must give the needed importance to certain aspects. Research carried out reveals an intensified concern of the companies for creating their own websites, for communicating with potential clients from the virtual environment, but they do not give importance to issues related to updating the information, structure, appearance, purpose sites. Most companies use the website mainly for information. They give little importance to promotion, yet not realizing the benefits they might have. Less than one third of the websites analyzed offers the possibility of online orders.

  5. Lactose behaviour in the presence of lactic acid and calcium.

    Science.gov (United States)

    Wijayasinghe, Rangani; Vasiljevic, Todor; Chandrapala, Jayani

    2016-08-01

    Physical properties of lactose appeared influenced by presence of lactic acid in the system. Some other components such as Ca may further attenuate lactose behaviour and impact its phase transition. A model-based study was thus implemented with varying concentrations of Ca (0·12, 0·072 or 0·035% w/w) and lactic acid (0·05, 0·2, 0·4 or 1% w/w) in establishing the effects of these two main acid whey constituents on lactose phase behaviour. Concentrated solutions (50% w/w) containing lactose, lactic acid and Ca were analysed for thermal behaviour and structural changes by Differential Scanning Colorimetry (DSC) and Fourier Transform Infrared Spectroscopy (FTIR), respectively. Presence of 1% (w/w) lactic acid and 0·12% (w/w) Ca in lactose solution significantly increased the evaporation enthalpy of water, delayed and increased the energy required for lactose crystallisation as compared to pure lactose. FTIR analysis indicated a strong hydration layer surrounding lactose molecules, restricting water mobility and/or inducing structural changes of lactose, hindering its crystallisation. The formation of calcium lactate, which restricts the diffusion of lactose molecules, is also partly responsible. It appears that Ca removal from acid whey may be a necessary step in improving the processability of acid whey.

  6. An Analysis of the Social Media Presence of the Brands

    Directory of Open Access Journals (Sweden)

    OTILIA-ELENA PLATON

    2014-05-01

    Full Text Available Brands need to be close to consumers. The pursuing of this objective convinced an increasing number of companies to start using social media tools, such as social networks or blogs, in order to communicate with a great number of consumers. Hence, social media is rapidly turning into an important part of the brand communication strategy. The power of social media marketing can help the companies to create brand awareness and also to enhance the consumers’ engagement with a brand. Nowadays people seem to enjoy being part of an online brand community. Building a strong social media presence is an efficient way to generate high visibility for the brand. But the companies looking to reach greater exposure for their brand have to vie with dozens of other brands that seek to gain the same consumers’ attention. This is why the authenticity and the credibility are essential aspects that increase the chances of success. Based on the investigation of secondary data sources, this paper aims to analyze the social media presence of some of the most successful brands in Romania. Looking at some examples of social media marketing campaigns, this paper will outline the importance and the impact of such practices for the long-lasting customer relationship and the brand image.

  7. HMW glutenin variation and rye chromatine presence in wheat genome

    Directory of Open Access Journals (Sweden)

    Obreht Dragana R.

    2003-01-01

    Full Text Available For estimation of wheat end-product quality during wheat breeding programs composition of high-molecular-weight glutenin subunits (HMW GS and the presence of 1BL/1RS translations serve as markers due to their profound effects on dough elasticity and viscous properties. Ninety-three wheat genotypes from Institute of Field and Vegetable Crops in Novi Sad have been analyzed by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE in order to determine their HMW GS composition and 1BL/1RS translocation presence. Eleven alleles were found at the Glu-1 loci. Subunits 1 and 2*and the null allele N were determined at the Glu-A1 locus. Subunitis 7, 7+9, 7+8, 6+8, 20 and 21 were found at the Glu-B1 locus, subunits 2+12 and 5+10 at the Glu-D1 locus. The 1BL/1RS translocation was discovered in 28 cultivars, although three of them were heterogeneous.

  8. Environmental presence and persistence of pharmaceuticals: An overview

    Science.gov (United States)

    Glassmeyer, Susan T.; Koplin, Dana W.; Furlong, Edward T.; Focazio, M.

    2008-01-01

    Emerging contaminants (ECs) in the environment – that is, chemicals with domestic, municipal, industrial, or agricultural sources that are not commonly monitored but may have the potential for adverse environmental effects – is a rapidly growing field of research. The use of “emerging” is not intended to infer that the presence of these compounds in the environment is new. These chemicals have been released into the environment as long as they have been in production or, in the case of hormones and other endogenous compounds, since the rise of animal life. What is emerging is the interest by the scientific and lay communities in the presence of these chemicals in the environment, the analytical capabilities required for detection, and the subtle effects that very small concentrations of these chemicals appear to have on aquatic biota. In December 2006, Environmental Science & Technology devoted an entire special issue (volume 40, number 23) to the topic of ECs, illustrating the increased interest in the subject. Within the EGs, one particular class that has seen a substantial increase in research over the past 10 years is pharmaceuticals and personal-care products (PPCPs). This increased research interest can be demonstrated by several means, including requests for proposals from funding agencies, but the clearest indication of a focused effort to understand the introduction, transformation, and potential health and environmental effects of PPCPs and ECs, in general, is the number of published reports. This increase can be shown by examining six environmental journals that regularly publish PPCP-related papers – Chemosphere, Environmental Science & Technology, Environmental Toxicology and Chemistry, Science of the Total Environment, Water Research, and Water Science and Technology. In 1998 there were 22 papers published on pharmaceuticals, antibiotics, or drugs in these 6 journals; by 2006, this number increased sixfold to 132 papers (Figure 1.1).This

  9. Behaviour of fluoropolymers in presence of tritiated water

    International Nuclear Information System (INIS)

    Bubueanu, Gh.; Postolache, C.; Tuta, C.

    2011-01-01

    Complete text of publication follows. One of the most used methods for tritium recovery from tritiated water relies on combined electrolysis with catalytic isotope exchange techniques. The electrolytic cell converts the tritiated water or tritiated heavy water into a hydrogen, deuterium and tritium mixture. The mixture is purified and then tritium is recovered by catalytic isotopic separation techniques. Tritium presence in the system induces an intense radiation field especially at aqueous solution interface. This can generate significant structural modifications with potentially negative effects. In this paper work it is followed the study of radiolytic phenomena in Pt/C/PTFE isotopic exchange catalyst, NAFION membranes and VITON fluoroelastomer in presence of tritiated water with high radioactive concentration. Radiolytical processes were analyzed by: Exposure of fluoropolymers samples immersed in H 2 O at gamma radiation field (60-Co source) in vacuum, at liq. Nitrogen temperature and at ambient temperature respectively; Immersing of NAFION, Pt/C/PTFE catalyst and VITON samples in tritiated water with high activity (3.7 and 37 TBq/L) for different time period. In both cases the samples were characterized by FT IR ATR, and fluoride ions emission from polymeric matrix. Experimental results were correlated with quantum-chemical simulations.

  10. Maintaining relationships with your patients by maximizing your online presence.

    Science.gov (United States)

    Donnelly, John; Kaaihue, Maarit

    2011-01-01

    Medical practices that take full advantage of today's online consumer-driven culture will leave other practices in their wake. With today's modern consumers looking to the Internet more and more for finding medical solutions for their family, it is imperative that your practice uses all of the tools available for creating and maintaining its online presence. We all know that having a functional Web site these days is a necessity for practically any business in any industry; however, taking your online presence further by using a few techniques can set up your practice for great success. Your online marketing should help your practice with managing patient relationships at all levels. To best reach this goal, continually analyzing data and updating your online marketing approach will help further drive leads and conversions. Using a few search engine optimization techniques as well as optimal design and marketing methods will allow you to more easily find prospective patients, build trust and credibility with your current patients, and manage your reputation.

  11. Vaccine criticism: Presence and arguments on French-speaking websites.

    Science.gov (United States)

    Nugier, A; Limousi, F; Lydié, N

    2018-02-01

    To evaluate the presence of vaccine criticism on the French Web and to analyze strategies and arguments used by opponents of vaccination. The most frequently used keywords associated with the terms "vaccination" and "vaccine" on Google.fr in September 2013 were identified and searched for individually on Google.fr. The links presented in the first three pages of results were reviewed to identify the most frequent providers of information. The proportion of critical content was determined by website type and a content analysis was performed. The main preoccupations about vaccination were general concerns; types of website. Six major strategies and categories of arguments used by opponents of vaccination were identified: the manipulation of science, the use of shocking images and an appeal to emotions via testimonies, a general vaccination conspiracy, the individual's freedom of choice not respected, an unnatural act and a negative benefit/risk balance. It seems important to monitor online vaccination debates, to develop an institutional presence that meets the needs of Internet users and to help them develop a critical view. Copyright © 2017 Elsevier Masson SAS. All rights reserved.

  12. Quantum Stackelberg duopoly in the presence of correlated noise

    International Nuclear Information System (INIS)

    Khan, Salman; Ramzan, M; Khan, M Khalid

    2010-01-01

    We study the influence of entanglement and correlated noise using correlated amplitude damping, depolarizing and phase damping channels on the quantum Stackelberg duopoly. Our investigations show that under the influence of an amplitude damping channel a critical point exists for an unentangled initial state at which firms get equal payoffs. The game becomes a follower advantage game when the channel is highly decohered. Two critical points corresponding to two values of the entanglement angle are found in the presence of correlated noise. Within the range of these limits of the entanglement angle, the game is a follower advantage game. In the case of a depolarizing channel, the payoffs of the two firms are strongly influenced by the memory parameter. The presence of quantum memory ensures the existence of the Nash equilibrium for the entire range of decoherence and entanglement parameters for both the channels. A local maximum in the payoffs is observed which vanishes as the channel correlation increases. Moreover, under the influence of the depolarizing channel, the game is always a leader advantage game. Furthermore, it is seen that the phase damping channel does not affect the outcome of the game.

  13. Pyrolysis of coal in the presence of nitric oxide

    Energy Technology Data Exchange (ETDEWEB)

    Berkowitz, N; Dammeyer, W

    1956-01-01

    Examination of tars obtained by low-temperature carbonization of a subbituminous coal in the presence of NO suggests that NO will both retard thermal decomposition and inhibit secondary polymerization in the tar phase. But both reactions are subject to the condition that NO is present at the start of incipient pyrolysis (they do not occur if NO is admitted to the retorts at a point above the decomposition temperature of the coal), and their extent depends sharply upon the concentration of NO. At comparatively low partial pressure of NO, the dominant reaction is retardation of decomposition; significant modification of the tar, leading to a greater proportion of low-boiling material, is confined to high-partial pressure of NO. Conclusions, after analyzing tar yields and infrared spectra of tar fractions, are that the inhibition of secondary polymerization in the tar phase involves the transient attachment of NO to primary tar molecules, and that the inhibitory effect of NO is essentially temporary. Tars modified by NO do not appear to be more stable than normal tars in the presence of light, and their composition, as determined by infrared spectroscopy, is not perceptibly different.

  14. SICKNESS PRESENCE AND STRESSFUL LIFE EVENTS OF HEALTH CARE WORKERS.

    Science.gov (United States)

    Škerjanc, Alenka; Fikfak, Metoda Dodič

    2015-09-01

    The aim of the study is to investigate the relationship between sickness presence and stressful life events among health care workers. Data were gathered from all health care workers at the University Medical Centre Ljubljana employed there in the period between 1 January 2010 and 31 December 2010. Each employee obtained a questionnaire composed of two standardized international questionnaires. There were 57% of sickness present health care workers among the participants. The sickness present reported to have more diseases of family member than the non-sickness present (OR = 1.5; 95% CI = 1.2-2.0), loan (OR = 1.4; 95% CI = 1.1-1.6), their partner lost job (OR = 1.4; 95% CI = 1.0-1.8), or they changed the place of living (OR = 1.4; 95% CI = 1.0-2.0). The results of the study indicate that stressful life events with economic consequences might have an important influence on sickness presence.

  15. Assessing effects of cholera vaccination in the presence of interference.

    Science.gov (United States)

    Perez-Heydrich, Carolina; Hudgens, Michael G; Halloran, M Elizabeth; Clemens, John D; Ali, Mohammad; Emch, Michael E

    2014-09-01

    Interference occurs when the treatment of one person affects the outcome of another. For example, in infectious diseases, whether one individual is vaccinated may affect whether another individual becomes infected or develops disease. Quantifying such indirect (or spillover) effects of vaccination could have important public health or policy implications. In this article we use recently developed inverse-probability weighted (IPW) estimators of treatment effects in the presence of interference to analyze an individually-randomized, placebo-controlled trial of cholera vaccination that targeted 121,982 individuals in Matlab, Bangladesh. Because these IPW estimators have not been employed previously, a simulation study was also conducted to assess the empirical behavior of the estimators in settings similar to the cholera vaccine trial. Simulation study results demonstrate the IPW estimators can yield unbiased estimates of the direct, indirect, total, and overall effects of vaccination when there is interference provided the untestable no unmeasured confounders assumption holds and the group-level propensity score model is correctly specified. Application of the IPW estimators to the cholera vaccine trial indicates the presence of interference. For example, the IPW estimates suggest on average 5.29 fewer cases of cholera per 1000 person-years (95% confidence interval 2.61, 7.96) will occur among unvaccinated individuals within neighborhoods with 60% vaccine coverage compared to neighborhoods with 32% coverage. Our analysis also demonstrates how not accounting for interference can render misleading conclusions about the public health utility of vaccination. © 2014, The International Biometric Society.

  16. Presenteeism--unhealthy extra presence in the workplace.

    Science.gov (United States)

    Zakrzewska, Karolina

    2014-01-01

    Modifications of working conditions and difficult labour market situation have an influence on employee's health status. Consequently, new psychological phenomena can be observed in the workplace. One of them is presenteeism (sickness presence), i.e. situation when sick employee is present at work. It is associated with the decrease of productivity. The symptoms have an effect on work, its quality and amount by decreasing the productivity, generating the possibilities to make mistakes and distracting the employee from work. In case of the infectious diseases, there is a risk of disease transmission to colleagues and close contacts. Presenteeism can be defined as 'unhealthy officiousness'. It may frequently result from uncertainty, decreased possibilities for finding new work, activities aimed at reducing the absenteeism (especially sickness absenteeism) and associated costs. From the studies transpires that hidden costs of presenteeism exceed the costs of treatment, absenteeism and disability. The chronic presenteeism results in decreasing employee's productivity and potential disability. Initial pilot studies confirm that presenteeism is also observed in Poland. Thus, there is a necessity to conduct further studies on presence of sick employees in the workplace.

  17. WDR1 Presence in the Songbird Basilar Papilla

    Science.gov (United States)

    Adler, Henry J.; Sanovich, Elena; Brittan-Powell, Elizabeth F.; Yan, Kai; Dooling, Robert J.

    2009-01-01

    WD40 repeat 1 protein (WDR1) was first reported in the acoustically injured chicken inner ear, and bioinformatics revealed that WDR1 has numerous WD40 repeats, important for protein-protein interactions. It has significant homology to actin interacting protein 1 (Aip1) in several lower species such as yeast, roundworm, fruitfly and frog. Several studies have shown that Aip1 binds cofilin/actin depolymerizing factor, and that these interactions are pivotal for actin disassembly via actin filament severing and actin monomer capping. However, the role of WDR1 in auditory function has yet to be determined. WDR1 is typically restricted to hair cells of the normal avian basilar papilla, but is redistributed towards supporting cells after acoustic overstimulation, suggesting that WDR1 may be involved in inner ear response to noise stress. One aim of the present study was to resolve the question as to whether stress factors, other than intense sound, could induce changes in WDR1 presence in the affected avian inner ear. Several techniques were used to assess WDR1 presence in the inner ears of songbird strains, including Belgian Waterslager (BW) canary, an avian strain with degenerative hearing loss thought to have a genetic basis. Reverse transcription, followed by polymerase chain reactions with WDR1-specific primers, confirmed WDR1 presence in the basilar papillae of adult BW, non-BW canaries, and zebra finches. Confocal microscopy examinations, following immunocytochemistry with anti-WDR1 antibody, localized WDR1 to the hair cell cytoplasm along the avian sensory epithelium. In addition, little, if any, staining by anti-WDR1 antibody was observed among supporting cells in the chicken or songbird ear. The present observations confirm and extend the early findings of WDR1 localization in hair cells, but not in supporting cells, in the normal avian basilar papilla. However, unlike supporting cells in the acoustically damaged chicken basilar papilla, the inner ear of the BW

  18. Does the presence of hydronephrosis have effects on micropercutaneous nephrolithotomy?

    Science.gov (United States)

    Karatag, Tuna; Buldu, Ibrahim; Kaynar, Mehmet; Inan, Ramazan; Istanbulluoglu, Mustafa Okan

    2015-03-01

    To evaluate the effects of presence of hydronephrosis on micropercutaneous nephrolithotomy (micro-PNL) surgery. A retrospective analysis of 112 patients who underwent microperc surgery between December 2012 and April 2014 was performed. Patients were evaluated in two groups according to whether the presence of hydronephrosis. Stone size and location, fluoroscopy and operation time, stone-free rates and patient-related parameters were prospectively recorded into a centralized computer-generated system. A total of 58 patients in Group 1 with hydronephrosis and 54 patients in Group 2 with no hydronephrosis were analyzed. There was no statistically significant difference in terms of stone sizes and body mass indexes (BMI) in comparison of groups (155.2 ± 93.06 vs. 143.70 ± 70.77 mm(2), p = 0.856 and 27.6 ± 4.2 vs. 26.7 ± 3.2 kg/m(2), p = 0.625). The success rates were similar (91.3 vs. 92.5%, p = 0.341). While the mean operation time and fluoroscopy time in Group 1 were 44.2 ± 23.62 min and 105.3 ± 47 s, it was 38.8 ± 26.4 min and 112.53 ± 68.3 s in Group 2, but there was no statistical difference in comparison of both groups. The mean attempts of percutan puncture were 1.35 ± 0.47 in Group 1 and 1.76 ± 0.31 in Group 2 (p = 0.185). We also found no statistical differences regarding mean hemoglobin change and hospitalization time, respectively (p = 0.685 and p = 0753). In comparison of grades of hydronephrosis, there was no statistically significant difference in subgroups analysis. The presence of hydronephrosis does not affect success rates and operative time in micro-PNL procedures significantly. Micropercutaneous nephrolithotomy is technically feasible and efficacious both in hydronephrotic and non-hydronephrotic kidneys.

  19. The presence of non-carious lesions in children

    Directory of Open Access Journals (Sweden)

    Demko-Rihter Ivana

    2015-01-01

    Full Text Available Introduction. A non-carious lesion (NCL is the loss of hard dental tissue on the neck, tuberculum and incisal edges of the teeth. Interest in clinical presence and in unclear etiology of these lesions allows for their future prevention and treatment. Objective. The aim of the study was to determine presence and clinical characteristics of NCLs and dentine hypersensitivity (DH, as well as their possible risk factors in children, in the population of the city of Novi Sad. Methods. A total of 55 subjects were included in the present study, aged between three and 18 years. Each subject completed a structured questionnaire related to the etiological factors, and all teeth of each subject were examined by two independent clinical dentists to determine NCLs and DH. In the case of small children, their parents or guardians filled out the questionnaire. Teeth with NCLs and DH were diagnosed according to the Basic Erosive Wear Examination (BEWE index and by a blast of air according to Schiff and Hypersensitivity Index. The review was carried out by inspection and probing. Results. The data were analyzed by clinical examination and comparison of the answers to the questionnaires. We observed an increased presence of non-caries lesions on primary teeth, compared to permanent teeth, with a statistically significant difference (χ2=3.86, df=1, p=0.04. The changes were observed in 82 teeth, and were most frequent on the canine deciduous teeth (65% and canine permanent teeth (51%. BEWE index was 10-11% to 92-100% in permanent, and 51-57% in deciduous teeth. Majority of patients with primary teeth (89.36% did not respond to air stimulus, while most patients with permanent teeth (74.29% did not react to Schiff Index. In the estimate of sensitivity, the respondents reported hypersensitivity on 6.38% of the deciduous teeth and 22.86% of the permanent teeth. Comparison of etiology factors did not reveal a direct link with the appearance of NCLs. Conclusion. Research

  20. A VARIA T OF RIFT VALLEY FEVER VIRU

    African Journals Online (AJOL)

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    African Journals Online (AJOL)

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    African Journals Online (AJOL)

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    African Journals Online (AJOL)

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  4. Determinantes nutricionais e sóciodemográficos da variação de peso no pós-parto: uma revisão da literatura Nutritional and socio-demographic determinants of post-partum weight change: a literature review

    Directory of Open Access Journals (Sweden)

    Maria Beatriz Trindade de Castro

    2009-06-01

    Full Text Available Trata-se de um estudo de revisão sobre os fatores nutricionais e sócio-demográficos da variação de peso no pós-parto. Foi realizada uma busca bibliográfica nas bases de dados eletrônicas Scientific Eletronic Library On-line (SciELO, Literatura Latino-Americana e do Caribe em Ciências da Saúde (LILACS e Medical Literature Analysis and Retrieval System Online (MEDLINE referente a literatura publicada na última década (1997-2008. Treze artigos, um informe técnico e dois livros considerados relevantes sobre o assunto e publicados anteriormente ao ano 1997 foram citados na revisão. A revisão priorizou estudos de ensaios clínicos randomizados e de seguimento realizados com gestantes e mulheres no pós-parto. Os resultados obtidos mostram como principais fatores associados com a variação de peso no pós-parto o ganho de peso gestacional acima das recomendações do Institute of Medicine, Índice de Massa Corporal Pré-Gestacional > 25 kg/m2, dieta, tempo e intensidade do aleitamento materno e os fatores sócio-demográficos: raça negra, primiparidade, idade materna, baixa renda e baixa escolaridade. A prática regular de atividade física é recomendada como uma estratégia para evitar o ganho de peso excessivo e melhorar a perda de peso durante o pós-parto. No Brasil não existe uma estratégia nacional para prevenir o ganho de peso excessivo e garantir a adequada perda de peso nesse período. Durante o pós-parto, a maioria das ações de saúde visa basicamente garantir o aleitamento materno.This study is a review of nutritional and sociodemographic factors determining post-partum weight variation. A bibliographical search was carried out on the electronic databases Scientific Eletronic Library On-line (SciELO, Latin-American and Caribbean Literature on Health Sciences (LILACS and Medical Literature Analysis and Retrieval System Online (MEDLINE for titles published in the past decade (1997-2008. Thirteen articles, one technical

  5. Variação genética em progênies de Myracrodruon urundeuva F.F. & M.F. Allemão em três sistemas de cultivo Genetic variation in progenies of Myracrodruon urundeuva F.F. & M.F. Allemao in three cultivation systems

    Directory of Open Access Journals (Sweden)

    Miguel Luiz Menezes Freitas

    2006-06-01

    Full Text Available Myracrodruon urundeuva (aroeira é uma das espécies arbóreas que apresentam madeira de maior durabilidade em contato com o solo. Em razão dessa característica, populações naturais de M. urundeuva, distribuídas por quase todo o Brasil, vêm sendo dizimadas. Desse modo, o presente trabalho teve por objetivo avaliar a expressão da variação genética em uma população natural de M. urundeuva procedente da Estação Ecológica do Instituto Florestal, localizada em Paulo de Faria, SP. Coletaram-se sementes de 30 árvores de polinização livre, em setembro de 1996. Com esse material, foram instalados três testes de progênies em diferentes sistemas de plantio em Selvíria, MS, obedecendo a um delineamento em blocos casualizados, com 30 tratamentos (progênies e três repetições. Foi assumido o modelo de cruzamento misto para essa espécie. Verificou-se que houve diferença significativa nos efeitos de progênies e ambiente (testes de progênies, e a interação progênies x ambientes não foi significativa. Desse modo, as progênies apresentaram comportamento semelhante nos diferentes ambientes. A melhor "performance" das progênies foi no plantio envolvendo M. urundeuva, Guazuma ulmifolia (Lam e Anandenanthera falcata (Benth. Speg., as quais também apresentaram considerável variação genética, indicando alto valor para programas de conservação e melhoramento genético.Myracrodruon urundeuva is one of the tree species the wood that presents the longest durability when in contact with soil. Because of this characteristic, populations of M. urundeuva have been decimated throughout Brazil. Therefore, this work aimed at analyzing the expression of genetic variation in a natural population of M. urundeuva from the Ecological Station of the Forest Institute, located in Paulo de Faria-SP. Seeds were collected from 30 free-pollination trees in September, 1996. By using this material, three progeny trials were installed in different

  6. Time-variations of equivalent water heights'from Grace Mission and in-situ river stages in the Amazon basin Variações temporais do equivalente à altura d'água obtidas da Missão Grace e da altura d'água in-situ nos rios da bacia Amazônica

    Directory of Open Access Journals (Sweden)

    Flavio Guilherme Vaz de Almeida

    2012-03-01

    Full Text Available Gravity Recovery and Climate Experiment (GRACE mission is dedicated to measuring temporal variations of the Earth's gravity field. In this study, the Stokes coefficients made available by Groupe de Recherche en Géodésie Spatiale (GRGS at a 10-day interval were converted into equivalent water height (EWH for a ~4-year period in the Amazon basin (from July-2002 to May-2006. The seasonal amplitudes of EWH signal are the largest on the surface of Earth and reach ~ 1250mm at that basin's center. Error budget represents ~130 mm of EWH, including formal errors on Stokes coefficient, leakage errors (12 ~ 21 mm and spectrum truncation (10 ~ 15 mm. Comparison between in situ river level time series measured at 233 ground-based hydrometric stations (HS in the Amazon basin and vertically-integrated EWH derived from GRACE is carried out in this paper. Although EWH and HS measure different water bodies, in most of the cases a high correlation (up to ~80% is detected between the HS series and EWH series at the same site. This correlation allows adjusting linear relationships between in situ and GRACE-based series for the major tributaries of the Amazon river. The regression coefficients decrease from up to down stream along the rivers reaching the theoretical value 1 at the Amazon's mouth in the Atlantic Ocean. The variation of the regression coefficients versus the distance from estuary is analysed for the largest rivers in the basin. In a second step, a classification of the proportionality between in situ and GRACE time-series is proposed.A missão espacial Gravity Recovery and Climate Experiment (GRACE é dedicada às medidas das variações temporais no campo gravitacional da Terra. Neste estudo, os coeficientes de Stokes disponibilizados pelo Groupe de Recherche en Géodésie Spatiale (GRGS com intervalos de 10 dias foram convertidos no equivalente à altura d'água (EWH para um período de 4 anos na bacia Amazônica (de julho de 2002 a maio de 2006

  7. Apreciações generalizadas sobre a variação das características químicas das unidades de solos da estação experimental de Limeira General appreciation on the chemical characteristics variation of soil units from the experiment station of Limeira, SP

    Directory of Open Access Journals (Sweden)

    João Bertoldo de Oliveira

    1973-01-01

    Full Text Available Retomando os resultados analíticos referentes às análises químicas de 122 amostras resultantes de 61 pontos de amostragem, coletadas para o levantamento de solos da Estação Experimental de Limeira, os autores apresentam, para as unidades Goiabeira, Limeira, Transição, Boneca e Represa, as freqüências relativas de distribuição das várias características analisadas: Ca2+, Mg2+, Ca2+/Mg2+. K+, Al3+, S (soma de bases, T (capacidade de troca de cations, V% (saturação em bases e pH em água, na camada superficial e a 50 cm de profundidade. Para melhor visualização e síntese dos dados, foram organizados vários quadros, nos quais são apresentadas as distribuições porcentuais dos pontos analisados, bem como os teores máximos e mínimos encontrados, para cada uma das características químicas. Tais porcentagens são referidas a níveis arbitrários. O estudo mostra que a delimitação de uma população de indivíduos-solo, baseada exclusivamente em características morfológicas, mesmo ao nível de série, produz separações de unidades com variações mais ou menos amplas das características químicas, não obstante as unidades apresentarem certa homogeneidade. Os dados apresentados permitem, ainda, acreditar que o estabelecimento de uma pesquisa agronômica, na qual se procure tirar inferências do comportamento de plantas, com respeito a variados tratamentos intimamente dependentes de características intrínsecas do solo. não pode chegar a bom termo, a menos que uma metodologia estatística bem aplicada, aliada a um levantamento criterioso e detalhado de solo, absorva os possíveis resultados estranhos, resultantes da variação, por vezes acentuada, de características apresentadas pelo solo.The relative frequences of distribution of the various chemical characteristics, Ca2+, Mg2+, Ca2+/Mg2+, K+, Al3+, exchangeable cations, cation exchange capacity, base saturation and pH in water for samples from the top soil and 50 cm

  8. Morphological variation in populations of Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae from Madeira and Paraguay river basins Variação morfológica em populações de Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae das bacias dos rios Madeira e Paraguai

    Directory of Open Access Journals (Sweden)

    Willian Massaharu Ohara

    2007-10-01

    Full Text Available The saua Tetragonopterus argenteus is endemic to South America. It has a wide geographic distribution and occurs in different Brazilian basins, such as those of the Madeira and Paraguay rivers. In this work, it was noticed that populations from these basins have morphological variations between them, indicating a possible geographic isolation. Specimens were studied using twelve morphological characters that were submitted to the canonical variates and body proportion analysis. In the canonical variate analysis, the populations from the Madeira and Paraguay river basins were differentiated by caudal peduncle depth, eye diameter, pre-ventral distance, body height, snout length and head length. In the body proportion analysis, the population of Madeira river basin presented head length, orbital diameter, pre-dorsal distance, dorsal-fin length, pre-ventral distance, body height and caudal peduncle height, smaller than those of the population from Paraguay river basin. These results allowed the recognition of intra-specific variation amplitude, that could become an important instrument for management and conservation of this species. O sauá Tetragonopterus argenteus é endêmico da América do Sul, apresenta ampla distribuição geográfica e ocorre em várias bacias brasileiras, entre elas as dos rios Madeira e Paraguai. Neste trabalho foi observado que as populações dessas bacias apresentam variações morfológicas que, provavelmente, representam isolamento geográfico. Exemplares foram estudados através de 12 caracteres morfológicos e submetidos às análises de variáveis canônicas e de proporções corporais. Na análise das variáveis canônicas, as populações das bacias dos rios Madeira e Paraguai diferenciaram-se pelo diâmetro do olho, distância pré-ventral, altura do corpo, comprimento do focinho, altura do pedúnculo caudal e comprimento da cabeça. Na análise das proporções corporais, a população da bacia do rio Madeira

  9. Presence of moulds and aflatoxin M1 in milk

    Directory of Open Access Journals (Sweden)

    Janković Vesna V.

    2009-01-01

    Full Text Available Aflatoxin M1 (AFM1 appears in milk or dairy products as a direct result of the cattle's ingestion of feed contaminated with aflatoxin B1 (AFB1. This study comprises mycological and mycotoxicological investigations of 23 milk samples (raw, infant food, pasteurized, whey and yoghurt. The mycological testing showed dominant presence of genus Geotrichum. G. candidum was found in 9 samples, with the highest contamination in the raw milk samples. The contamination level of AM1 is defined by using direct competitive enzyme- -linked immunosorbent assay (ELISA. AFM1 was found in 9 samples. AFM1 levels were lower than the recommended limits. However, as AFM1 is considered a probable human carcinogen (2B type, it is necessary to achieve a low level of AFM1 in milk. Therefore, cows' feed samples from various cowsheds are supposed to be evaluated routinely for aflatoxin, and kept away from fungal contamination as much as possible.

  10. Computationally Secure Pattern Matching in the Presence of Malicious Adversaries

    DEFF Research Database (Denmark)

    Hazay, Carmit; Toft, Tomas

    2014-01-01

    for important variations of the secure pattern matching problem that are significantly more efficient than the current state of art solutions: First, we deal with secure pattern matching with wildcards. In this variant the pattern may contain wildcards that match both 0 and 1. Our protocol requires O......We propose a protocol for the problem of secure two-party pattern matching, where Alice holds a text t∈{0,1}∗ of length n, while Bob has a pattern p∈{0,1}∗ of length m. The goal is for Bob to (only) learn where his pattern occurs in Alice’s text, while Alice learns nothing. Private pattern matching...... is an important problem that has many applications in the area of DNA search, computational biology and more. Our construction guarantees full simulation in the presence of malicious, polynomial-time adversaries (assuming the hardness of DDH assumption) and exhibits computation and communication costs of O...

  11. Scattering theory of walking droplets in the presence of obstacles

    International Nuclear Information System (INIS)

    Dubertrand, Rémy; Hubert, Maxime; Schlagheck, Peter; Vandewalle, Nicolas; Bastin, Thierry; Martin, John

    2016-01-01

    We aim to describe a droplet bouncing on a vibrating bath using a simple and highly versatile model inspired from quantum mechanics. Close to the Faraday instability, a long-lived surface wave is created at each bounce, which serves as a pilot wave for the droplet. This leads to so called walking droplets or walkers. Since the seminal experiment by Couder et al (2006 Phys. Rev. Lett. 97 154101) there have been many attempts to accurately reproduce the experimental results.We propose to describe the trajectories of a walker using a Green function approach. The Green function is related to the Helmholtz equation with Neumann boundary conditions on the obstacle(s) and outgoing boundary conditions at infinity. For a single-slit geometry our model is exactly solvable and reproduces some general features observed experimentally. It stands for a promising candidate to account for the presence of arbitrary boundaries in the walker’s dynamics. (paper)

  12. Moduli evolution in the presence of flux compactifications

    International Nuclear Information System (INIS)

    Barreiro, Tiago; Carlos, Beatriz de; Copeland, Ed; Nunes, Nelson J.

    2005-01-01

    We study the cosmological evolution of the volume moduli in a class of recently proposed inflationary universe models of Kachru et al. arising out of Type IIB string theory, where a number of the moduli fields have been stabilized through flux compactifications. Developing an approach introduced by some of us earlier, we show, in agreement with Brustein et al., how the presence of extra sources of matter act so as to provide additional friction, slowing the modulus field as it evolves down its potential, thereby vastly increasing the region of parameter space which leads to the eventual stabilization of these fields. Extending the case to include both the real and imaginary parts of the volume modulus, we show how the parameter space of initial conditions is modified and comment on the impact for these inflationary models arising out of flux type compactifications

  13. Gamma irradiation of unsaturated hydrocarbons in presence of hydrogen

    International Nuclear Information System (INIS)

    Molinari, M.A.; Strehar, N.R.; Videla, G.J.

    1975-11-01

    Only small increases in yield (G values) of saturated products are observed in the irradiation with 60 Co gamma radiation, of ethylene and 1-butene. The values obtained are: G(C 2 H 6 )=0,3-0,4 (for ethylene/H 2 ) and G(n-C 4 H 10 )=2,1 (for 1-butene/H 2 ), with total dose of 8 to 9.10 19 eV. In a similar irradiation of acetylene in presence of hydrogen, ethylene was obtained with relatively high G-values: G=5,4 for a dose of 2.10 18 eV G=17,5 for 2,5x10 19 eV and G=8,4 for 2,3.10 20 eV. Benzene yield shows some increases (G=6,6-9,1) in relation to values in absence of hydrogen. (author) [es

  14. Perforated Sigmoid Diverticulitis in the Presence of Toxic Epidermal Necrolysis

    Directory of Open Access Journals (Sweden)

    P. Heye

    2014-02-01

    Full Text Available Even though the incidence of toxic epidermal necrolysis (TEN is low, it is also associated with a high mortality rate. The condition predominantly affects the skin, but may also affect the gastrointestinal tract, dramatically increasing mortality. We present a case of perforated sigmoid diverticulitis in the presence of TEN. The patient was taking medication, known to be a risk factor, and presented an affected total body surface area and temporal development similar to previously reported cases of TEN. Characteristic abdominal symptoms, however, were missing. Gastrointestinal involvement in TEN appears to be a poor prognostic factor; medical staff must therefore be alert to patients with TEN who complain of abdominal discomfort. The exact pathogenesis, however, remains unclear.

  15. Home automation and simulation of presence in empty environments

    Directory of Open Access Journals (Sweden)

    Marques Israel

    2017-01-01

    Full Text Available Since their humble beginnings at the dawn of the 20th Century until contemporary age, automation and control systems have grown exponentially in both complexity and importance. Its relevance on human activities, be they mundane tasks or crucial processes, is self-evident. Among its many utilities, automated systems acquire a noble mission when put in service to protect life and property from aggressors of any kind. This paper discusses how home automation components can be utilized to implement an alternative domestic security strategy that consists in simulating the presence of an individual in an empty environment in the absence of its owner in order dissuade potential trespassing criminals, once they would feel highly discouraged to carry the criminal act should they believe the property is occupied.

  16. Residual symmetries in the presence of an EM background

    International Nuclear Information System (INIS)

    Carrion, H.L.; Rojas, M.; Toppan, F.

    2002-08-01

    The symmetry algebra of a QFT in the presence of an external EM background (named 'residual symmetry') is investigated within a Lie-algebraic, model independent scheme. Some results previously encountered in the literature are here extended. In particular we compute the symmetry algebra for a constant EM background in D = 3 and D = 4 dimensions. In D = 3 dimensions the residual symmetry algebra is isomorphic to u(1) +P c (2), with P c (2) the centrally extended 2-dimensional Poincare algebra. In D = 4 dimension the generic residual symmetry algebra is given by a seven-dimensional solvable Lie algebra which is explicitly computed. residual symmetry algebras are also computed for specific non-constant EM backgrounds. (author)

  17. Holographic vortices in the presence of dark matter sector

    Science.gov (United States)

    Rogatko, Marek; Wysokinski, Karol I.

    2015-12-01

    The dark matter seem to be an inevitable ingredient of the total matter configuration in the Universe and the knowledge how the dark matter affects the properties of superconductors is of vital importance for the experiments aimed at its direct detection. The homogeneous magnetic field acting perpendicularly to the surface of (2+1) dimensional s-wave holographic superconductor in the theory with dark matter sector has been modeled by the additional U(1)-gauge field representing dark matter and coupled to the Maxwell one. As expected the free energy for the vortex configuration turns out to be negative. Importantly its value is lower in the presence of dark matter sector. This feature can explain why in the Early Universe first the web of dark matter appeared and next on these gratings the ordinary matter forming cluster of galaxies has formed.

  18. Prisoners' dilemma in the presence of collective dephasing

    International Nuclear Information System (INIS)

    Nawaz, Ahmad

    2012-01-01

    We quantize prisoners' dilemma in the presence of collective dephasing with a dephasing rate γ. It is shown that for a two-parameter set of strategies, Q⊗Q is Nash equilibrium below a cut-off value of time. Beyond this cut-off it bifurcates into two new Nash equilibria Q⊗D and D⊗Q. Furthermore, for the maximum value of decoherence C⊗D and D⊗C also become Nash equilibria. At this stage the game has four Nash equilibria. On the other hand, for a three-parameter set of strategies, there is no pure strategy Nash equilibrium; however, there is a mixed strategy (non-unique) Nash equilibrium that is not affected by collective dephasing. (paper)

  19. Finite volume form factors in the presence of integrable defects

    International Nuclear Information System (INIS)

    Bajnok, Z.; Buccheri, F.; Hollo, L.; Konczer, J.; Takacs, G.

    2014-01-01

    We developed the theory of finite volume form factors in the presence of integrable defects. These finite volume form factors are expressed in terms of the infinite volume form factors and the finite volume density of states and incorporate all polynomial corrections in the inverse of the volume. We tested our results, in the defect Lee–Yang model, against numerical data obtained by truncated conformal space approach (TCSA), which we improved by renormalization group methods adopted to the defect case. To perform these checks we determined the infinite volume defect form factors in the Lee–Yang model exactly, including their vacuum expectation values. We used these data to calculate the two point functions, which we compared, at short distance, to defect CFT. We also derived explicit expressions for the exact finite volume one point functions, which we checked numerically. In all of these comparisons excellent agreement was found

  20. Presence of Corporate Frauds at a Global Level

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    Vranješ Svjetlana

    2017-06-01

    Full Text Available The legislative bodies of the countries, members of the accounting and auditing profession, various associations have taken a number of preventive measures and mechanisms for combating corporate criminal activities and financial frauds, but unfortunately, the fact is that even today they often happen in both undeveloped and the most developed market economies. It is therefore essential to pay significant attention to corporate criminal activity and financial frauds that are happening in the business world. The aim of this paper is to show the presence of different forms of corporate criminal activity at a global level, and to display a conceptual framework of criminal activity and motives for their doing. Concluding remarks of this paper provide guidelines for further research and recommendations on how to improve the mechanisms for preventing and detecting criminal activity.

  1. Holographic vortices in the presence of dark matter sector

    International Nuclear Information System (INIS)

    Rogatko, Marek; Wysokinski, Karol I.

    2015-01-01

    The dark matter seem to be an inevitable ingredient of the total matter configuration in the Universe and the knowledge how the dark matter affects the properties of superconductors is of vital importance for the experiments aimed at its direct detection. The homogeneous magnetic field acting perpendicularly to the surface of (2+1) dimensional s-wave holographic superconductor in the theory with dark matter sector has been modeled by the additional U(1)-gauge field representing dark matter and coupled to the Maxwell one. As expected the free energy for the vortex configuration turns out to be negative. Importantly its value is lower in the presence of dark matter sector. This feature can explain why in the Early Universe first the web of dark matter appeared and next on these gratings the ordinary matter forming cluster of galaxies has formed.

  2. Holographic vortices in the presence of dark matter sector

    Energy Technology Data Exchange (ETDEWEB)

    Rogatko, Marek; Wysokinski, Karol I. [Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin, pl. Marii Curie-Skłodowskiej 1 (Poland)

    2015-12-09

    The dark matter seem to be an inevitable ingredient of the total matter configuration in the Universe and the knowledge how the dark matter affects the properties of superconductors is of vital importance for the experiments aimed at its direct detection. The homogeneous magnetic field acting perpendicularly to the surface of (2+1) dimensional s-wave holographic superconductor in the theory with dark matter sector has been modeled by the additional U(1)-gauge field representing dark matter and coupled to the Maxwell one. As expected the free energy for the vortex configuration turns out to be negative. Importantly its value is lower in the presence of dark matter sector. This feature can explain why in the Early Universe first the web of dark matter appeared and next on these gratings the ordinary matter forming cluster of galaxies has formed.

  3. Kalman-Takens filtering in the presence of dynamical noise

    Science.gov (United States)

    Hamilton, Franz; Berry, Tyrus; Sauer, Timothy

    2017-12-01

    The use of data assimilation for the merging of observed data with dynamical models is becoming standard in modern physics. If a parametric model is known, methods such as Kalman filtering have been developed for this purpose. If no model is known, a hybrid Kalman-Takens method has been recently introduced, in order to exploit the advantages of optimal filtering in a nonparametric setting. This procedure replaces the parametric model with dynamics reconstructed from delay coordinates, while using the Kalman update formulation to assimilate new observations. In this article, we study the efficacy of this method for identifying underlying dynamics in the presence of dynamical noise. Furthermore, by combining the Kalman-Takens method with an adaptive filtering procedure we are able to estimate the statistics of the observational and dynamical noise. This solves a long-standing problem of separating dynamical and observational noise in time series data, which is especially challenging when no dynamical model is specified.

  4. Barite formation in the presence of a commercial copolymer

    Science.gov (United States)

    Ruiz-Agudo, Cristina; Putnis, Christine; Ruiz-Agudo, Encarnacion; Putnis, Andrew

    2015-04-01

    Fluid composition can significantly modify the mechanisms of mineral formation. Particularly, the presence of organic additives in the aqueous media has been shown to alter the precipitation of minerals substantially (e.g. calcium carbonate, barium carbonate and barium sulfate). Despite the numerous studies dealing with barite precipitation and the influence of organic additives (e.g. Benton et al. 1993, Qi et al., 2000, Wang and Cölfen, 2006, Mavredaki et al., 2011), the details of the mechanism of barite formation in the presence of organic additives, particularly at the early stages of this process, are yet to be fully resolved. Here, we present observations on the initial stages of barite formation from aqueous solutions, as well as the alterations induced by a commercial copolymer (maleic acid/allyl sulfonic acid copolymer with phosphonate groups), commonly used as a scale inhibitor in oil recovery. Most synthetic commercial additives contain the same functional groups (e.g. carboxylate, phosphonate and/or sulfonate groups). Thus our work may help to understand the mechanism by which copolymers modify crystallization processes and aid in the selection of the most appropriate inhibitors for hindering or controlling barite scale formation. Barite scaling is one of the main problems in many industrial processes (such as, paper-making, chemical manufacturing, cement operations, off-shore oil extraction, geothermal energy production). Using Atomic Force Microscopy (AFM), we show that barite growth is significantly influenced by the presence of the copolymer. In its absence, barium sulfate growth occurs by 2D island nucleation and spreading. The addition of small amounts (0.1 ppm and 0.5 ppm) of the copolymer enhances 2D nucleation but blocks growth. Just 1 ppm of inhibitor is enough to block barite nucleation and growth by adsorption of a copolymer layer onto the barite surface. Transmission electron microscopy (TEM) was also used to gain better insights into the

  5. The Perception is a Prism: body, presence and technologies

    Directory of Open Access Journals (Sweden)

    Enrico

    2014-05-01

    Full Text Available Starting from an interdisciplinary perspective of the concepts of body, perception, and technologies in the contemporary scene, this text will attempt to define the general aesthetic notion as bodyscape as an extension of the performer’s perception. Through a survey of some key practices from the contemporary scene such as choreographic compositions by Myriam Gourfink, Isabelle Choinière, and the project of motion signature by Martine Époque and Denis Poulin, the impact of technologies on redefining the process of the performer’s perception in the composition of the movement and the change of the notion of presence will be analysed. In this sense, a series of modifications that influence also the spectator’s perception is presented. Therefore, the notion of empathy is discussed, and an attempt to find out how this applies in the context of a digital image of the body is made.

  6. Eutrophication decrease: Phosphate adsorption processes in presence of nitrates.

    Science.gov (United States)

    Boeykens, Susana P; Piol, M Natalia; Samudio Legal, Lisa; Saralegui, Andrea B; Vázquez, Cristina

    2017-12-01

    Eutrophication causes aquatic environment degradation as well as serious problems for different purposes of water uses. Phosphorus and nitrogen, mainly as phosphate and nitrate respectively, are considered responsible for eutrophication degradation. The focus of this work was the study of adsorption processes for decreasing phosphate and nitrate concentrations in bi-component aqueous systems. Dolomite and hydroxyapatite were selected as low-cost adsorbents. Obtained results showed that both adsorbents have high capacity for phosphate adsorption which the presence of nitrate does not modify. Hydroxyapatite proved to be the most efficient adsorbent, however, it showed a low percentage of desorption and few possibilities of reuse. Dolomite, on the other hand, allows a desorption of the adsorbed material that favours its reuse. Copyright © 2017 Elsevier Ltd. All rights reserved.

  7. Residual symmetries in the presence of an EM background

    Energy Technology Data Exchange (ETDEWEB)

    Rojas Leyva, Moises Porfirio; Salazar, Hector Leny Carrion; Toppan, Francesco [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)]. E-mail: mrojas, hleny, toppan@cbpf.br

    2001-07-01

    The symmetry algebra of a QFT in the presence of an external EM background (named 'residual symmetry') is investigated within a Lie-algebraic, model independent scheme. Some results previously encountered in the literature are here extended. In particular we compute the symmetry algebra for a constant EM background in D = 3 and D = 4 dimensions. In D = 3 dimensions the residual symmetry algebra is isomorphic to u(1) + P{sub c} (2) the centrally extended 2-dimensional Poincare algebra. In D=4 dimensions the generic residual symmetry algebra is given by a 7 dimensional solvable Lie algebra which is explicitly computed. Residual symmetry algebras are also computed for specific non-constant EM backgrounds. (author)

  8. Synthesis of magnetite nanoparticles in the presence of aminoacids

    International Nuclear Information System (INIS)

    Marinescu, Gabriela; Patron, Luminita; Culita, Daniela C.; Neagoe, Cristian; Lepadatu, Costinel I.; Balint, Ioan; Bessais, Lotfi; Cizmas, Corneliu Bazil

    2006-01-01

    A new synthesis route to prepare magnetite nanoparticles in only one step is described. The precipitation of magnetite is performed in the presence of aminoacid solution. The experimental protocol is original and the nanomagnetites are characterized by XRD, FTIR, TEM and SQUID magnetometry. A theoretical study of the consistent experimental results was performed using QSPR (Quantitative Structure Property Relationsheep). According with these studies the synthesized nanoparticles seem to be organized into a core-shell system, where the inner-core is formed from unit cells of magnetite. A way to control the self-assembly and the physical properties of the synthesized nanoparticles consists in their correlation with descriptors representing the aminoacid chemical structures. Using quantum chemical as well as the other simplest original descriptors it was found a relationship between the used aminoacids and the magnetization, nanoparticles diameter, magnetite core diameter and the (Fe 3 O 4 ) 8 cells in each nanoparticle core

  9. Chromatographic determination of Terbinafine in presence of its Photodegradation products

    International Nuclear Information System (INIS)

    Abdel-Moety, E.M.; Kelani, K.O.; Abou Al-Alamein, A.M.

    2003-01-01

    Two different chromatographic techniques have been developed for the determination of terbinafine hydrochloride in presence of its photodegradation products. The first method depends on coupling the TLC- fractionation, on silicia gel 60F254 utilizing chloroform+methanol+25% aq. ammonia ( 12: 0.1:0.1,by volumes), with the direct scanning at 284nm. The second method describes a liquid chromatographic separation of terbinafine and its photolytic degradates on a reversed-phase column[u-Bondapak-TMC 18 (10um,25cmx4.6mm,i.d.)] using a mobile phase containing methanol+water= 80:20 (v/v) with UV-detection at 284 nm. The proposed methods showed significant stability-indication with good linearity, precision and reproducibility. (author)

  10. Fluorescence molecular tomography in the presence of background fluorescence

    International Nuclear Information System (INIS)

    Soubret, Antoine; Ntziachristos, Vasilis

    2006-01-01

    Fluorescence molecular tomography is an emerging imaging technique that resolves the bio-distribution of engineered fluorescent probes developed for in vivo reporting of specific cellular and sub-cellular targets. The method can detect fluorochromes in picomole amounts or less, imaged through entire animals, but the detection sensitivity and imaging performance drop in the presence of background, non-specific fluorescence. In this study, we carried out a theoretical and an experimental investigation on the effect of background fluorescence on the measured signal and on the tomographic reconstruction. We further examined the performance of three subtraction methods based on physical models of photon propagation, using experimental data on phantoms and small animals. We show that the data pre-processing with subtraction schemes can improve image quality and quantification when non-specific background florescence is present

  11. Faecalibacterium Gut Colonization Is Accelerated by Presence of Older Siblings

    DEFF Research Database (Denmark)

    Laursen, Martin Frederik; Laursen, Rikke Pilmann; Larnkjær, Anni

    2017-01-01

    Faecalibacterium prausnitzii is a highly abundant human gut microbe in healthy individuals, but it is present at reduced levels in individuals with gastrointestinal inflammatory diseases. It has therefore been suggested to constitute a marker of a healthy gut and is associated with anti......-inflammatory properties. However, factors affecting the colonization of F. prausnitzii in the human gut during early life are very poorly understood. By analysis of 16S rRNA amplicon sequencing data from three separate infant study populations, we determined the colonization dynamics of Faecalibacterium and factors...... affecting its establishment in the gut. We found that in particular, the presence of older siblings was consistently associated with Faecalibacterium gut colonization during late infancy and conclude that acquisition of Faecalibacterium is very likely to be accelerated through transfer between siblings...

  12. Delayed system control in presence of actuator saturation

    Directory of Open Access Journals (Sweden)

    A. Mahjoub

    2014-09-01

    Full Text Available The paper is introducing a new design method for systems’ controllers with input delay and actuator saturations and focuses on how to force the system output to track a reference input not necessarily saturation-compatible. We propose a new norm based on the way we quantify tracking performance as a function of saturation errors found using the same norm. The newly defined norm is related to signal average power making possible to account for most common reference signals e.g. step, periodic. It is formally shown that, whatever the reference shape and amplitude, the achievable tracking quality is determined by a well defined reference tracking mismatch error. This latter depends on the reference rate and its compatibility with the actuator saturation constraint. In fact, asymptotic output-reference tracking is achieved in the presence of constraint-compatible step-like references.

  13. Moduli evolution in the presence of thermal corrections

    International Nuclear Information System (INIS)

    Barreiro, Tiago; Carlos, Beatriz de; Copeland, Edmund J.; Nunes, Nelson J.

    2008-01-01

    We study the effect of thermal corrections on the evolution of moduli in effective supergravity models. This is motivated by previous results in the literature suggesting that these corrections could alter and even erase the presence of a minimum in the zero temperature potential, something that would have disastrous consequences in these particular models. We show that, in a representative sample of flux compactification constructions, this need not be the case, although we find that the inclusion of thermal corrections can dramatically decrease the region of initial conditions for which the moduli are stabilized. Moreover, the bounds on the reheating temperature coming from demanding that the full, finite temperature potential, has a minimum can be considerably relaxed given the slow pace at which the evolution proceeds.

  14. Hydrazine determination in presence of uranium by modified spectrophotometric method

    International Nuclear Information System (INIS)

    Velavendan, P.; Pandey, N.K.; Kamachi Mudali, U.; Natarajan, R.

    2011-01-01

    In the present work an indirect, sensitive and accurate method for the determination of hydrazine is described. The method is based on the formation of yellow coloured azine complex by post column derivatization of hydrazine with P-dimethylamino benzaldehyde. The formed yellow coloured complex is stable in acidic medium and has a maximum absorption at 460 nm. Interference due to uranium was studied and the method was applied for the determination of hydrazine in presence of uranium in aqueous stream of nuclear fuel reprocessing. A calibration graph was made for the concentration range of hydrazine from 0.05 ppm to 10 ppm with RSD 0.807% and correlation coefficient of 0.99996. (author)

  15. Quantification of uranyl in presence of citric acid

    International Nuclear Information System (INIS)

    Garcia G, N.; Barrera D, C.E.; Ordonez R, E.

    2007-01-01

    To determine the influence that has the organic matter of the soil on the uranyl sorption on some solids is necessary to have a detection technique and quantification of uranyl that it is reliable and sufficiently quick in the obtaining of results. For that in this work, it intends to carry out the uranyl quantification in presence of citric acid modifying the Fluorescence induced by UV-Vis radiation technique. Since the uranyl ion is very sensitive to the medium that contains it, (speciation, pH, ionic forces, etc.) it was necessary to develop an analysis technique that stands out the fluorescence of uranyl ion avoiding the out one that produce the organic acids. (Author)

  16. Analysis of radiative heat transfer in the presence of obscurations

    International Nuclear Information System (INIS)

    Finkelstein, L.; Weissman, Y.

    1981-05-01

    Numerical simulation of radiative heat transfer problems in general axisymmetric geometry in the presence of an active gas is considered. Such simulation requires subdivision of the radiating surfaces into discrete elements, which are in the present case radiating rings. While the effect of a participating medium is easily taken into account by integration along the lines of vision between the surface elements, the calculation of the different obscurations poses the main difficulty. We have written a closed expression which formulates the problem exactly, and then developed a systematic and compact computational approach to the obscuration problem in complex configurations. The present procedure is particularly suited to computer calculations associated with engineering applications in the aircraft and furnace industries. (author)

  17. Analysis Regarding the Growing Presence of Italian Firms in Romania

    Directory of Open Access Journals (Sweden)

    Stefano Valdemarin

    2015-12-01

    Full Text Available At the end of 2014, the number of firms with an Italian presence in Romania was 39,556, representing 19.33% out of total registered firms and this number is still growing. This article focuses on answering the following question: what kind of Italian firms are investing in Romania and why? Starting from the empirical observation that the number of Italian firms in Romania grew by 6.82% last year, we have used a PESTEL analysis to find the key points characterizing the country, paying attention also to the concept of country brand. From the point of view of Italian firms, we have also analyzed the shifting paradigm of internationalization from a Vertical Foreign Direct Investment model to a Horizontal Foreign Direct Investment model. This paper can be useful for managers and entrepreneurs who are oriented towards investing in Romania following the path of Italian firms.

  18. Notes on the Presence of the Greek Tragedy in Colombia

    Directory of Open Access Journals (Sweden)

    Sandro Romero Rey

    2018-01-01

    Full Text Available The ancient world and, in particular that of Greek tragedy, is present in Colombia under various masks. This article takes on a journey through the presence of the works of Aeschylus, Sophocles and Euripides in different artistic manifestations. From poetry and narrative, to cinema and the visual arts, ancient tragedy has served as a metaphor to reflect on the situation of extreme violence in this South American country and the ways in which a possible utopia of reconciliation can be built. At the same time, it focuses on the different scenic models, from their praxis on the stage where the “illustrative” versions stand out, to the transformations in the representation conventions or the use of fables as triggers in much more ambitious creative immersions. The following paper in English was the starting point for Encounters with Classical Antiquity in Latin America. A Humanities / Humanity Workshop at Yale University in October 2017, presented by its author.

  19. Issues of the presence of parasitic protozoa in surface waters

    Science.gov (United States)

    Hawrylik, Eliza

    2018-02-01

    Parasitic protozoa are very numerous organisms in the environment that play an important role in the spread of water-borne diseases. Water-borne epidemics caused by parasitic protozoa are noted throughout the world. Within these organisms, intestinal protozoa of the genera Cryptosporidium and Giardia are ones of the most serious health hazards for humans. This paper focuses on the problem of the presence of parasitic protozoa in surface waters. Characteristics of the most frequently recognized pathogens responsible for water-borne outbreaks were described, as well as sources of contamination and surface waters contamination due to protozoa of the genus Cryptosporidium and Giardia were presented. The methods of destroying the cysts and oocysts of parasitic protozoa used nowadays in the world were also presented in a review.

  20. [Presence of islands of fatty tissue in struma].

    Science.gov (United States)

    Lax, S; Beham, A; Langsteger, W; Schmid, C

    1988-04-01

    We examined 929 surgically obtained thyroid glands derived from 791 female and 138 male patients and found intrathyroidal adipose tissue in 18 cases (1.94%). Only the thyroid glands of middle aged and older women (mean age 51 years) were affected, as well as in the case of follicular adenomas and nodular and diffuse hyperplasia. With respect to localization in the interstitial connective tissue, as well as between thyroid follicles, interstitial, parenchymatous and mixed types are proposed. In addition to sex and age there is a high correlation with obesity, which is suggestive of hormonal influences. Knowledge of the presence of intrathyroidal fat tissue is of interest to the pathologist since it may lead to erroneous interpretations of histological and cytological specimens of the thyroid gland. In conclusion, not one case of hypothyroidism was detected amongst the 18 cases investigated in this study.