319 research outputs found

    The species of Schendylops Cook, 1899 (Chilopoda, Geophilomorpha, Schendylidae) from Madagascar

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    Four of the five species of the geophilomorph centipede genus Schendylops Cook, 1899 hitherto known from Madagascar, i.e. S. insolitus (Lawrence, 1960), S. paucispina (Lawrence, 1960), S. mascarenicus (Lawrence, 1960) and S. silvicola (Lawrence, 1960), are re-described based on the type material preserved in the collections of the Muséum national d’Histoire naturelle in Paris. A key is provided for the identification of all Malagasy species of the genus, which likely form a clade within Schendylops.Quatre espèces de chilopodes géophilomorphes du genre Schendylops Cook, 1899 parmi les cinq connues jusqu’ici de Madagascar, c’est-à-dire S. insolitus (Lawrence, 1960), S. paucispina (Lawrence, 1960), S. mascarenicus (Lawrence, 1960) et S. silvicola (Lawrence, 1960), sont redécrites d’après le matériel type conservé dans les collections du Muséum national d’Histoire naturelle de Paris. Une clé est fournie pour l’identification de toutes les espèces de ce genre connues de Madagascar, qui forment très vraisemblablement un clade.Facultad de Ciencias Naturales y Muse

    Geophilomorph centipedes (Chilopoda) from termite mounds in the northern Pantanal wetland of Mato Grosso, Brazil

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    Of two species of geophilomorph centipedes collected above high waters in termite mounds in the Pantanal of Mato Grosso, one (Schendylops inquilinus) is described here as new; the other (Aphilodon angustatus Silvestri, 1909) is redescribed.Facultad de Ciencias Naturales y Muse

    Effect of external PEEP in patients under controlled mechanical ventilation with an auto-PEEP of 5 cmH2O or higher.

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    In some patients with auto-positive end-expiratory pressure (auto-PEEP), application of PEEP lower than auto-PEEP maintains a constant total PEEP, therefore reducing the inspiratory threshold load without detrimental cardiovascular or respiratory effects. We refer to these patients as complete PEEP-absorbers. Conversely, adverse effects of PEEP application could occur in patients with auto-PEEP when the total PEEP rises as a consequence. From a pathophysiological perspective, all subjects with flow limitation are expected to be complete PEEP-absorbers, whereas PEEP should increase total PEEP in all other patients. This study aimed to empirically assess the extent to which flow limitation alone explains a complete PEEP-absorber behavior (i.e., absence of further hyperinflation with PEEP), and to identify other factors associated with it.One hundred patients with auto-PEEP of at least 5 cmH2O at zero end-expiratory pressure (ZEEP) during controlled mechanical ventilation were enrolled. Total PEEP (i.e., end-expiratory plateau pressure) was measured both at ZEEP and after applied PEEP equal to 80 % of auto-PEEP measured at ZEEP. All measurements were repeated three times, and the average value was used for analysis.Forty-seven percent of the patients suffered from chronic pulmonary disease and 52 % from acute pulmonary disease; 61 % showed flow limitation at ZEEP, assessed by manual compression of the abdomen. The mean total PEEP was 7 ± 2 cmH2O at ZEEP and 9 ± 2 cmH2O after the application of PEEP (p < 0.001). Thirty-three percent of the patients were complete PEEP-absorbers. Multiple logistic regression was used to predict the behavior of complete PEEP-absorber. The best model included a respiratory rate lower than 20 breaths/min and the presence of flow limitation. The predictive ability of the model was excellent, with an overoptimism-corrected area under the receiver operating characteristics curve of 0.89 (95 % CI 0.80-0.97).Expiratory flow limitation was associated with both high and complete PEEP-absorber behavior, but setting a relatively high respiratory rate on the ventilator can prevent from observing complete PEEP-absorption. Therefore, the effect of PEEP application in patients with auto-PEEP can be accurately predicted at the bedside by measuring the respiratory rate and observing the flow-volume loop during manual compression of the abdomen

    The Messinian salinity crisis: open problems and possible implications for Mediterranean petroleum systems

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    Abstract: A general agreement on what actually happened during the Messinian salinity crisis (MSC) has been reached in the minds of most geologists but, in the deepest settings of the Mediterranean Basin, the picture is still far from being finalized and several different scenarios for the crisis have been proposed, with different significant implications for hydrocarbon exploration. The currently accepted MSC paradigm of the ‘shallow-water deep-basin’ model, which implies high-amplitude sea-level oscillations (> 1500 m) of the Mediterranean up to its desiccation, is usually considered as fact. As a consequence, it is on this model that the implications of the MSC events on the Mediterranean petroleum systems are commonly based. In fact, an alternative, deep-water, non-desiccated scenario of the MSC is possible: it (i) implies the permanence of a large water body in the Mediterranean throughout the entire Messinian salinity crisis, but with strongly reduced Atlantic connections; and (ii) envisages a genetic link between Messinian erosion of the Mediterranean margins and deep brine development. In this work, we focus on the strong implications of an assessment of the petroleum systems of the Mediterranean and adjoining areas (e.g. the Black Sea Basin) that can be based on such a non-desiccated MSC scenario. In particular, the near-full basin model delivers a more realistic definition of Messinian source-rock generation and distribution, as well as of the magnitude of water-unloading processes and their effects on hydrocarbon accumulation

    M. Tulli Ciceronis libri tres de Officiis ... un notis ... ad modum Johannis Minellii illustrati

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    Copia digital. Madrid : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, 2007Sign.: A-P12, Q4Front. calc

    Emergence of KPC-producing Klebsiella pneumoniae in Italy

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    <p>Abstract</p> <p>Background</p> <p>The emergence of KPC-producing <it>K. pneumoniae </it>has now become a global concern. KPC beta-lactamases are plasmid-borne and, like extended spectrum beta lactamases (ESBLs), can accumulate and transfer resistance determinants to other classes of antibiotics. Therefore, infection control guidelines on early identification and control of the spread of organisms carrying these resistant determinants are needed.</p> <p>Findings</p> <p><it>Klebsiella pneumoniae </it>carbapenemase (KPC) was detected in two isolates of carbapenem-resistant <it>K. pneumoniae </it>obtained from patients at an Italian teaching hospital. The first strain was isolated from a culture drawn from a central venous device (CVC) in a patient with Crohn's disease who was admitted to a gastroenterology ward. The second was isolated from a urine sample collected from an indwelling urinary catheter in an intensive care unit (ICU) patient with a subdural haematoma. The patients had not travelled abroad. Both isolates were resistant to all β-lactams and were susceptible to imipenem and meropenem but resistant to ertapenem. Isolates also showed resistance to other classes of non-β-lactam antibiotics, such as quinolones, aminoglycosides (with the exception for amikacin), trimethoprim-sulfamethoxazole (TMP-SMX) and nitrofurantoin. They were determined to contain the plasmid encoding the carbapenemase gene <it>bla-KPC </it>and were also positive in the Hodge test.</p> <p>Conclusions</p> <p>This is the second report of KPC-producing isolates in Italy, but the first concerning KPC type 2 gene, and it may have important implications for controlling the transmission of microorganisms resistant to antibiotics.</p

    A First Evaluation of a Multi-Modal Learning System to Control Surgical Assistant Robots via Action Segmentation

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    The next stage for robotics development is to introduce autonomy and cooperation with human agents in tasks that require high levels of precision and/or that exert considerable physical strain. To guarantee the highest possible safety standards, the best approach is to devise a deterministic automaton that performs identically for each operation. Clearly, such approach inevitably fails to adapt itself to changing environments or different human companions. In a surgical scenario, the highest variability happens for the timing of different actions performed within the same phases. This paper presents a cognitive control architecture that uses a multi-modal neural network trained on a cooperative task performed by human surgeons and produces an action segmentation that provides the required timing for actions while maintaining full phase execution control via a deterministic Supervisory Controller and full execution safety by a velocity-constrained Model-Predictive Controller
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