Carlos Villanueva

Carlos Villanueva
National Polytechnic Institute | IPN · Departamento de Ingeniería Geofísica

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25
Publications
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274
Citations

Publications

Publications (25)
Article
Full-text available
Introduction: The long-held belief that a ureteral re-implant tunnel should be five times the diameter of the ureter, as proposed by Paquin in 1959, ignores the effect of the orifice on the occurrence of reflux. In 1969, Lyon proposed that the shape of the ureteral orifice (UO) is more important than the intravesical tunnel. However, both theories...
Conference Paper
Full-text available
Vesicoureteral reflux (VUR) is the backward flow of urine from the bladder into the kidneys. There are many reasons for this reflux. In 1959, Paquin recommended a tunnel length 5 times the diameter of the ureter to prevent VUR based on anatomical comparisons of postmortem specimens of patients with and without VUR [1]. This has become the standard...
Article
Objectives: Almost 20 years after Cartwright et?al. (1996) demonstrated the feasibility and effectiveness of clinic meatotomy (CM) under topical lidocaine and prilocaine (EMLA) anesthesia, 50% of meatotomies are still performed under general anesthesia (GA) (Godley et al., 2015). The cost of a meatotomy under GA is approximately 10 times the cost...
Article
Full-text available
Efficient treatments in bacterial infections require the fast and accurate recognition of pathogens, with concentrations as low as one per milliliter in the case of septicemia. Detecting and quantifying bacteria in such low concentrations is challenging and typically demands cultures of large samples of blood (~1 milliliter) extending over 24–72 ho...
Article
Introduction: Although laparoscopic robotic-assisted intracorporeal ureteral tailoring is feasible and several authors have reported doing it, it adds a level of complexity to the surgery that many robotic surgeons are uncomfortable with. Also, some techniques for tailoring the ureter, like the one described by Ossandon, would be very difficult to...
Article
Background Porous silicon particles (PSiPs) have been used extensively as drug delivery systems, loaded with chemical species for disease treatment. It is well known from silicon producers that silicon is characterized by a low reduction potential, which in the case of PSiPs promotes explosive oxidation reactions with energy yields exceeding that o...
Article
To compare long-term microtensile bond strength of zirconia, surface-modified via a novel treatment, to current surface conditioning methods for zirconia, when resin bonded to dental composite. Two ProCAD (porcelain) and 10 sintered ZirCAD (ZrO(2)) blocks (18 mm × 14 mm × 12 mm) were obtained from manufacturers. Twelve Herculite XRV composite block...
Chapter
Full-text available
Este trabajo presenta el desarrollo de un sistema automatizado de: estimulación, adquisición y procesamiento de imágenes pupilares (que incluye la segmentación y la visualización en tiempo real), provenientes de las respuestas fotomotora y consensual del iris; de manera que, el médico puede observar en la interfaz del sistema: la representación grá...
Article
Reliability study. To assess the intrarater and interrater reliability of a recently described technique to measure of maximum canal compromise (MCC) and maximum spinal cord compression (MSCC) using digitized and magnified images in the setting of traumatic cervical spinal cord injury (SCI). The extent of MCC and MSCC is of clinical and prognostic...
Article
Full-text available
This paper presents a new development of an automated system for: stimulation, acquisition and the pupilar image processing (it includes segmentation and visualization in real time), issued from the fhoto-motor and consensual response of the iris. The physician can observe in the system interface: a graphic representation of the variation and chang...
Article
Full-text available
Se evaluaron los loci Y-específicos DYS287, DYS199 y DYS390 en un total de 105 individuos, en cuatro poblaciones del norte del Perú. Sólo un individuo presentó el linaje YAP+/C, de probable origen africano. La frecuencia de cromosomas Y Amerindios, indicado por el linaje YAP-/T, fue mayor en la población Aguaruna de Yamayakat (97%), disminuyendo en...
Article
Lead (Pb) in blood, bone, and semen was measured in 162 to 186 environmentally exposed men from Mexico City, aged 19- 48. Semen Pb was measured by inductively coupled plasma mass spectrometry, blood Pb by atomic absorption spectrometry and bone Pb by K X-ray fluorescence. Mean Pb levels in blood, semen, tibia (cortical) and patella (trabecular) bon...
Article
/T, fue mayor en la población Aguaruna de Yamayakat (97%), disminuyendo en mestizos de Moche (73%), Santiago de Chuco (53%) y Trujillo (33%); por otro lado, el grado de mestizaje fue mayor en las poblaciones nor-occidentales. Los haplótipos más frecuentes fueron YAP - /C/24 en Trujillo (47%) y YAP - /T/24 en Santiago de Chuco (23%). La diversidad h...
Article
The non-recombination region of the human Y chromosome is a very informative genetic tool for unraveling the history of human populations. 105 individuals from four northern populations of Peru, were genotyped for three Y-specific loci: DYS287, DYS199 and DYS390. Only one individual carried the YAP+/C lineage, more probably of African origin. The h...
Article
More information could be obtained from extracellular, field potentials, multicellular or oligocellular electrical recordings, if constituting waves were sorted for their analysis. Here a biosignal sorting device is described, based on a microcontroller circuit able to use two different and simultaneous sorting criteria (amplitude and refractory pe...

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