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Search Results: 1 - 10 of 7229 matches for " Tatiana Cabrera "
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Minioptical Navigation System for CT-Guided Percutaneous Liver Procedures  [PDF]
David A. Valenti, Louis-Martin Boucher, Giovanni Artho, Christopher von Jako, Tatiana Cabrera
Advances in Computed Tomography (ACT) , 2013, DOI: 10.4236/act.2013.23014

Purpose: To evaluate a new miniature optical navigation system for CT-guided liver interventions. Material and Methods: A two-center, prospective study was performed with four interventional radiologists. A total of 20 patients had CT-guided liver biopsy or ablation interventions utilizing the CT-Guide? navigation system (ActiViews Inc., Wakefield, MA) between July 2011 and December 2011. The navigation system consists of a self-adhesive patientsticker printed with coincident colored and radio-opaque reference markers, a miniature disposable video camera that clips on and off an interventional instrument, and software loaded on a computer to display the navigation information. The primary end point was the frequency of a satisfactory instrument position for the intended intervention. Results: The cohort consisted of 13 males and 7 females with an average age of 63.1 years (range of 38 to 80). Most of the patients, 70%, underwent CT-guided liver biopsy while the remainder had CT-guided ablation therapy. The average lesion size was 3.1 cm (range

Cardiac embolization of an implanted fiducial marker for hepatic stereotactic body radiotherapy: a case report
Hooman Hennessey, David Valenti, Tatiana Cabrera, Valerie Panet-Raymond, David Roberge
Journal of Medical Case Reports , 2009, DOI: 10.1186/1752-1947-3-140
Abstract: An 81-year-old Caucasian man (5 years post-gastrectomy for a gastric adenocarcinoma) was referred post-second line palliative chemotherapy for radiotherapy of an isolated liver metastasis. It was decided to proceed with treatment and platinum fiducials were chosen for radiation targeting. Under local anesthesia, three Nester embolization coils (Cook Medical Inc., Bloomington, IN, USA) were implanted under computed tomography guidance. Before the placement of each coil, the location of the tip of the delivery needle was confirmed by computed tomography imaging. During the procedure, the third coil unexpectedly migrated through the hepatic vein to the inferior vena cava and lodged at the junction of the vena cava and the right atrium. The patient remained asymptomatic. He was immediately referred to angiography for extraction of the coil. Using fluoroscopic guidance, an EN Snare Retrieval System (Hatch Medical L.L.C., Snellville, GA, USA) was introduced through a jugular catheter; it successfully grasped the coil and the coil was removed. The patient was kept overnight for observation and no immediate or delayed complications were encountered due to the migration or retrieval of the coil. He subsequently went on to be treated using the remaining fiducials.Implanted fiducial markers are increasingly used for stereotactic radiotherapy. There is sparse literature on the risks of such procedures. Although uncommon, the risk of migration does exist and therefore physicians (surgeons, oncologists and radiologists) and patients should be aware of this possibility.Stereotactic body radiation therapy (SBRT) is a technique that utilizes precise targeting of tumor irradiation in order to minimize exposure of adjacent normal tissue [1]. SBRT is used to treat a variety of primary and metastatic tumors of the lung, liver, pancreas, kidney, spine and prostate [2]. In the use of SBRT for liver lesions, tumor-targeting accuracy is crucial given the radiosensitive nature of the liver,
Panendoscopía digestiva alta en el ni o
Tatiana Rudloff F,Manuel Cabrera R,Fructuoso Biel C,Guillermo Venegas V
Revista chilena de pediatría , 1981,
El suicidio: más que una noticia, un tema de responsabilidad social
Henry Rubiano Daza,Tatiana Quintero Cabrera,Clara Inés Bonilla Londo?o
Palabra Clave , 2007,
Abstract: Sin duda alguna el suicidio es un hecho de gran interés para los medios de comunicación por su impacto social. Sin embargo, existe gran preocupación entre la comunidad académica y la masa crítica sobre la forma como se presenta este tipo de noticias, el lenguaje utilizado y el manejo estilístico del hecho, máxime si se tiene en cuenta que los adolescentes y jóvenes son vulnerables a este fenómeno y, lo peor, se desconocen las sugerencias que hacen organismos como la Organización Mundial de la Salud (OMS). Ante dicha percepción, el grupo de investigación Comdehuila, de la Universidad Cooperativa de Colombia, seccional Neiva, se interesó en investigar y profundizar hasta dónde va la responsabilidad de los medios impresos sobre el manejo periodístico de este tema en el Huila, paso inicial para un gran debate nacional.
Protein phase instability developed in plasma of sick patients: clinical observations and model experiments  [PDF]
Tatiana Yakhno
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.23034
Abstract: This article discusses the causes of formation of micron-size protein structures in liquid plasma or serum of the patients with different diseases, which are accompanied by inflammatory reac-tions. Self-organizing processes in sessile dry-ing drops of natural and model biological liq-uids are used for study of possible mechanisms of development the protein phase instability in serum. There was shown that violation of opti-mal ratio between albumin and osmotic active components could lead to loss of albumin ag-gregative stability and albumin coagulation structures formation. Possible role of these structures in pathogenesis of inflammation is discussed.
Market Making, Liquidity Provision, and Attention Constraints: An Experimental Study  [PDF]
Juan F. Cabrera
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.74061
Abstract: This paper uses an experimental electronic market to investigate the effect of limited attention on the market maker’s ability to provide liquidity and, thus, on aggregate market liquidity. I find that higher demands on the market maker’s attention worsen her ability to provide liquidity but do not reduce the aggregate level of market liquidity. This effect is only significant in less active markets. Furthermore, the aggregate level of market liquidity remains unaltered across both highly active and inactive markets, suggesting a reactive strategy by informed traders who step in to compete with market makers during high information intensity periods when their attention allocation efforts are compromised. In fact, in markets with a higher information value, the effect of attention constraints on the liquidity provision ability of market makers is greater. This implies that informed traders may not only exploit their informational advantage against uninformed traders but they may also use it to reap a higher share of liquidity-based profits. Finally, the market maker’s trading performance measured by her profit share and ability to manage her inventory worsens when demands on her attention are greater.
Eating disorders, body image, and dichotomous thinking among Japanese and Russian college women  [PDF]
Atsushi Oshio, Tatiana Meshkova
Health (Health) , 2012, DOI: 10.4236/health.2012.47062
Abstract: This study explored cross-cultural differences between Japan and Russia in terms of women’s body images, proneness to eating disorders, and the effects of dichotomous thinking. Participants included 419 Japanese and 187 Russian college women who completed the Dichotomous Thinking Inventory (DTI), the 26-item version of the Eating Attitudes Test, and responses regarding nine figures representing female body shapes. The mean age of the participants was 19.8 years, with no significant age differences between the countries. The results showed that Japanese women have leaner ideal body images than Russian women, whereas there were no cross-cultural differences in the participants’ real body images. DTI scores among Russian participants were higher than DTI scores among Japanese participants, which indicated that Russian women think more dichotomously than Japanese. Structural equation modeling indicated a significantly negative effect of dichotomous thinking only on real body image in Russia; the ideal body image had greater effects on eating disorder in Russia than in Japan.
Functional Acrylic Polymer as Corrosion Inhibitor of Carbon Steel in Autoclaved Air-Foamed Sodium Silicate-Activated Calcium Aluminate/Class F Fly Ash Cement  [PDF]
Toshifumi Sugama, Tatiana Pyatina
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.511109

The study focused on investigating the effectiveness of functional acrylic polymer (AP) in improving the ability of airfoamed sodium silicate-activated calcium aluminate/Class F fly ash cement (slurry density of 1.3 g/cm3) to mitigate the corrosion of carbon steel (CS) after exposure to hydrothermal environment at 200?C or 300?C. Hydrothermally-initiated interactions between the AP and cement generated the formation of Ca-, Al-, or Na-complexed carboxylate derivatives that improved the AP’s hydrothermal stability. A porous microstructure comprising numerous defect-free, evenly distributed, discrete voids formed in the presence of this hydrothermally stable AP, resulting in the increase in compresive strength of cement. The foamed cement with advanced properties conferred by AP greatly protected the CS against brine-caused corrosion. Four major factors governed this protection by AP-incorporated foamed cements: 1) Reducing the extents of infiltration and transportation of corrosive electrolytes through the cement layer deposited on the underlying CS surface; 2) Inhibiting the cathodic reactions at the corrosion site of CS; 3) Extending the coverage of CS by the cement; and 4) Improving the adherence of the cement to CS surface.

Toughness Improvement of Geothermal Well Cement at up to 300°C: Using Carbon Microfiber  [PDF]
Toshifumi Sugama, Tatiana Pyatina
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.44020
Abstract: This study aimed at assessing the usefulness of carbon microfiber (CMF) in improving the compressive-toughness of sodium metasilicate-activated calcium aluminate/Class F fly ash foamed cement at hydrothermal temperatures of up to 300°C. When the CMFs came in contact with a pore solution of cement, their surfaces underwent alkali-caused oxidation, leading to the formation of metal (Na, Ca, Al)-complexed carboxylate groups. The extent of this oxidation was enhanced by the temperature increase, corresponding to the incorporation of more oxidation derivatives at higher temperatures. Although micro-probe examinations did not show any defects in the fibers, the enhanced oxidation engendered shrinkage of the interlayer spacing between the C-basal planes in CMFs, and a decline in their thermal stability. On the other hand, the complexed carboxylate groups present on the surfaces of oxidized fibers played a pivotal role in improving the adherence of fibers to the cement matrix. Such fiber/cement interfacial bonds contributed significantly to the excellent bridging effect of fibers, resistance to the cracks development and propagation, and to improvement of the post-crack material ductility. Consequently, the compressive toughness of the 85°-, 200°-, and 300°C-autoclaved foamed cements reinforced with 10 wt% CMF was 2.4-, 2.9-, and 3.1-fold higher than for cement without the reinforcement.
Polyphosphatase PPX1 of Saccharomyces cerevisiae as a Tool for Polyphosphate Assay  [PDF]
Lidiya Lichko, Tatiana Kulakovskaya
Advances in Enzyme Research (AER) , 2015, DOI: 10.4236/aer.2015.34010
Abstract: The recombinant exopolyphosphatase PPX1 with a specific activity of ~300 U/mg protein was purified from the strain of Saccharomyces cerevisiae with the inactivated PPN1 gene transformed by the expression vector carrying the yeast PPX1 gene. The recombinant PPX1 was similar to the PPX1 of wild strains in its substrate specificity and requirement for cations. PPX1 had the high substrate specificity to polyphosphates. The preparation was suitable for polyphosphate assay in the presence of orthophosphate and nucleoside phosphates not hydrolyzed by PPX1. The yield of the enzyme preparation was 250 assays per 1 g of the biomass. The recombinant PPX1 was successfully used in polyphosphate assay in different yeast species and some foodstuffs.
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