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Search Results: 1 - 10 of 380783 matches for " P. C. Mares-Moreno "
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Detection of Helicobacter pylori in dental plaque of mexican children by real-time PCR  [PDF]
J. A. Valdez-Gonzalez, P. C. Mares-Moreno, M. J. Kowolik, J. Vargas-Villlarreal, F. Gonzalez-Salazar, M. A. De la Garza-Ramos
Health (Health) , 2014, DOI: 10.4236/health.2014.64034
Abstract:

Dental plaque in adult patients is well identified as a reservoir for Helicobacter pylori. This question still remains unclear in children. The aim of this study is to identify the presence of this bacterium in dental plaque of Mexican pediatric patients, using Real Time Polymerase Chain Reaction (qPCR). Forty patients from 2 to 11 years without dyspeptic symptoms were enrolled. Samples were collected from the subgingival space of the lingual side of the lower molars and cultured in selective medium. Therefore, qPCR analysis was conducted. According to the results obtained in this study, it was found that 35% of the pediatric population who participated tested qPCR positive for the presence of H. pylori in dental plaque samples. No significant associations were detected among isolation rate by gender or age. We found that dental plaque may be a reservoir for H. pylori. However, more research is needed to establish the way of the infection of pediatric population.

Herztransplantation: Intensivmedizinische Aspekte und Nachsorge
Hiesmayr M,Mares P
Journal für Kardiologie , 2004,
Abstract: Der frühe postoperative Verlauf nach Herztransplantation (HTx) wird durch 3 Hauptfaktoren beeinflu t: pr operativer Zustand, chronische Medikation und Funktion des Transplantates. Der pr operative Zustand des Patienten umfa t den Allgemeinzustand, sekund re Organsch digungen, wie zum Beispiel Einschr nkungen der Nieren- und Leberfunktion, und das Ausma der pulmonalen Hypertension. Die pr operative Medikation kann den Gef tonus über Tage beeinflussen, die Funktion des Transplantats ist entscheidend für die H modynamik. Die postoperative intensivmedizinische Behandlung von Patienten nach Herztransplantation basiert vielfach auf Erfahrung und deren Weitergabe zwischen den Zentren. Trotz des intensiven Erfahrungsaustausches bleibt die Variabilit t zwischen den Zentren in manchen Aspekten erheblich. Die Ursachen sind noch nicht in allen Facetten gekl rt.
Metallic properties of magnesium point contacts
R. H. M. Smit,A. I. Mares,M. Haefner,P. Pou,J. C. Cuevas,J. M. van Ruitenbeek
Physics , 2009, DOI: 10.1088/1367-2630/11/7/073043
Abstract: We present an experimental and theoretical study of the conductance and stability of Mg atomic-sized contacts. Using Mechanically Controllable Break Junctions (MCBJ), we have observed that the room temperature conductance histograms exhibit a series of peaks, which suggests the existence of a shell effect. Its periodicity, however, cannot be simply explained in terms of either an atomic or electronic shell effect. We have also found that at room temperature, contacts of the diameter of a single atom are absent. A possible interpretation could be the occurrence of a metal-to-insulator transition as the contact radius is reduced, in analogy with what it is known in the context of Mg clusters. However, our first principle calculations show that while an infinite linear chain can be insulating, Mg wires with larger atomic coordinations, as in realistic atomic contacts, are alwaysmetallic. Finally, at liquid helium temperature our measurements show that the conductance histogram is dominated by a pronounced peak at the quantum of conductance. This is in good agreement with our calculations based on a tight-binding model that indicate that the conductance of a Mg one-atom contact is dominated by a single fully open conduction channel.
Efectos del decúbito prono en el tratamiento del síndrome de dificultad respiratoria aguda en pacientes pediátricos
Blanco,Ana C; Moreno,Rodolfo P;
Archivos argentinos de pediatr?-a , 2006,
Abstract: introduction. the acute respiratory distress syndrome (ards) is an entity that causes the highest number of lethal cases and severe morbidity in patients admitted to pediatric intensive care units. the current treatment of this condition is based on mechanical ventilation with low volume and the application of positive end expiratory pressure (peep). a high number of patients continue with hypoxemia in spike of the adequate application of these measures; this has resulted in the use of therapeutic options aimed at improving oxygenation. one of these is the prone position ventilation. objective. to review the main mechanisms through which the prone position acts, as well as its effects in patients with ards. conclusions. the ventilation on prone position is a secure and efficient technique to improve oxygenation in approximately 60 to 70% of patients with ards. it has proved to be an useful tool in the current ventilatory strategies and must be repeated daily, at least in responder patients. the lack of worsening in gas exchange and hemodynamics in non-responder patients must stimulate subsequent trials in these patients. it has not demonstrated a decrease of mortality in ards patients.
Quality, Satisfaction and Industrial Disputes in the Tourist Accommodation Services of the State of Mérida, Venezuela  [PDF]
Flora M. Díaz-Pérez, Maria Bethencourt-Cejas, Marysela C. Morillo-Moreno
Technology and Investment (TI) , 2013, DOI: 10.4236/ti.2013.42015
Abstract:

The service quality is a dynamic and multidimensional construct; its study shall include the performance of all actors involved. Therefore, it has been measured the relationship between the variables of quality, satisfaction and existence of industrial disputes in the tourist accommodations of the state of Mérida, Venezuela. A stratified probability sampling and the use of Servqual scale showed a close positive association between the job satisfaction of customer service employees and the service quality, especially during the high tourism season. It was also evidenced during this season that the highest levels of service quality were in those establishments whose employees presented high levels of satisfaction and moderate absence of conflicts.

Simulation as a Support for Ultrasonic Testing  [PDF]
Pavel Mares
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.513118
Abstract:

Ultrasonic testing is a very important non-destructive method for testing components for safety of nuclear power plants and other security and delicate parts in other industries. Nowadays, thanks to the development of computer technology, it is possible to simulate processes which occur during ultrasonic testing. That is why numerical simulations are becoming an integral part of non-destructive testing. Simulations are used to determine parameters of ultrasonic examination, especially parameters of probes and scan plan and also in the analysis of results. They are used in such cases, when it is necessary to verify applicability of probes and methods. This verification could be provided on the weld and test block which are not manufactured. It could be also provided on defects, which are not manufactured in test block, but their presence is possible in given weld joint. Simulations are very useful for verifying the propagation of ultrasonic signal in given area (e.g. weld area). If movement of probe is limited, possibility of whole volume scan should be verified.

Predispersal home range shift of an ocelot Leopardus pardalis (Carnivora: Felidae) on Barro Colorado Island, Panama
Mares,Rafael; Moreno,Ricardo S; W. Kays,Roland; Wikelski,Martin;
Revista de Biología Tropical , 2008,
Abstract: home range shifts prior to natal dispersal have been rarely documented, yet the events that lead a subadult to abandon a portion of its home range and venture into unfamiliar territories, before eventually setting off to look for a site to reproduce, are probably related to the causes of dispersal itself. here, we used a combination of manual radio-tracking and an automated radio telemetry system to continuously study the movements of a subadult male ocelot (leopardus pardalis), a solitary carnivore with sex-biased dispersal, on barro colorado island, panama, for 18 months from may 2003 through october 2004. the subadult ocelot?s parents were also radio-tracked to record possible parent-offspring interactions within their home ranges. at the age of ca. 21 months the subadult gradually began to shift its natal home range, establishing a new one used until the end of the study, in an area that had previously been used by another dispersing subadult male. only three parent-offspring interactions were recorded during the four months around the time the range-shift occurred. the apparent peaceful nature of these encounters, along with the slow transition out of a portion of his natal home range, suggest the subadult was not evicted from his natal area by his parents. the timing of the shift, along with the subadult?s increase in weight into the weight range of adult ocelots four months after establishing the new territory, suggests that predispersal home range shifts could act as a low risk and opportunistic strategy for reaching adult size, while minimizing competition with parents and siblings, in preparation for an eventual dispersal into a new breeding territory. rev. biol. trop. 56 (2): 779-787. epub 2008 june 30.
Experimental Identification of Convective Heat Transfer in Machine Tools
P. Kohut,O. Horejs,M. Mares
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Discontinuity of capacitance at the onset of surface superconductivity
K. Morawetz,P. Lipavsky,J. J. Mares
Physics , 2008, DOI: 10.1088/1367-2630/11/2/023032
Abstract: The effect of the magnetic field on a capacitor with a superconducting electrode is studied within the Ginzburg-Landau approach. It is shown that the capacitance has a discontinuity at the onset of the surface superconductivity $B_{\rm c3}$ which is expressed as a discontinuity in the penetration depth of the electric field into metals. Estimates show that this discontinuity is observable with recent bridges for both conventional and high-$T_{\rm c}$ superconductors of the type-II.
Statistical wave scattering through classically chaotic cavities in the presence of surface absorption
M. Martinez-Mares,P. A. Mello
Physics , 2005, DOI: 10.1103/PhysRevE.72.026224
Abstract: We propose a model to describe the statistical properties of wave scattering through a classically chaotic cavity in the presence of surface absorption. Experimentally, surface absorption could be realized by attaching an "absorbing patch" to the inner wall of the cavity. In our model, the cavity is connected to the outside by a waveguide with N open modes (or channels), while an experimental patch is simulated by an "absorbing mirror" attached to the inside wall of the cavity; the mirror, consisting of a waveguide that supports Na channels, with absorption inside and a perfectly reflecting wall at its end, is described by a subunitary scattering matrix Sa. The number of channels Na, as a measure of the geometric cross section of the mirror, and the lack of unitarity of Sa as a measure of absorption, are under our control: these parameters have an important physical significance for real experiments. The absorption strength in the cavity is quantified by the trace of the lack of unitarity. The statistical distribution of the resulting S matrix for N=1 open channel and only one absorbing channel, Na =1, is solved analytically for the orthogonal and unitary universality classes, and the results are compared with those arising from numerical simulations. The relation with other models existing in the literature, in some of which absorption has a volumetric character, is also studied.
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