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Jesus Beltran-Perez,Gregory Ramsey,Jorge E. Lopera 소화기인터벤션의학회 2019 Gastrointestinal Intervention Vol.8 No.2
This case report shows an effective esophageal stent placement via retrograde (transgastric) approach under fluoroscopic guidance in the interven-tional radiology suite. This alternative can be evaluated and offered to patients that suffer from a firm esophageal occlusion before a major proce-dure such as surgery can be considered. Thus, decreasing major surgery complications and improving the quality of life.
Jesus Beltran-Perez,Gregory Ramsey,Jorge E. Lopera 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.2
This case report shows an effective esophageal stent placement via retrograde (transgastric) approach under fluoroscopic guidance in the interven-tional radiology suite. This alternative can be evaluated and offered to patients that suffer from a firm esophageal occlusion before a major proce-dure such as surgery can be considered. Thus, decreasing major surgery complications and improving the quality of life.
Perez, Moises Roberto Vallejo,Contreras, Hugo Ricardo Navarro,Herrera, Jesus A. Sosa,Avila, Jose Pablo Lara,Tobias, Hugo Magdaleno Ramirez,Martinez, Fernando Diaz-Barriga,Ramirez, Rogelio Flores,Vazqu The Korean Society of Plant Pathology 2018 Plant Pathology Journal Vol.34 No.5
Clavibacter michiganensis subsp. michiganesis (Cmm) is a quarantine-worthy pest in $M{\acute{e}}xico$. The implementation and validation of new technologies is necessary to reduce the time for bacterial detection in laboratory conditions and Raman spectroscopy is an ambitious technology that has all of the features needed to characterize and identify bacteria. Under controlled conditions a contagion process was induced with Cmm, the disease epidemiology was monitored. Micro-Raman spectroscopy ($532nm\;{\lambda}$ laser) technique was evaluated its performance at assisting on Cmm detection through its characteristic Raman spectrum fingerprint. Our experiment was conducted with tomato plants in a completely randomized block experimental design (13 plants ${\times}$ 4 rows). The Cmm infection was confirmed by 16S rDNA and plants showed symptoms from 48 to 72 h after inoculation, the evolution of the incidence and severity on plant population varied over time and it kept an aggregated spatial pattern. The contagion process reached 79% just 24 days after the epidemic was induced. Micro-Raman spectroscopy proved its speed, efficiency and usefulness as a non-destructive method for the preliminary detection of Cmm. Carotenoid specific bands with wavelengths at 1146 and $1510cm^{-1}$ were the distinguishable markers. Chemometric analyses showed the best performance by the implementation of PCA-LDA supervised classification algorithms applied over Raman spectrum data with 100% of performance in metrics of classifiers (sensitivity, specificity, accuracy, negative and positive predictive value) that allowed us to differentiate Cmm from other endophytic bacteria (Bacillus and Pantoea). The unsupervised KMeans algorithm showed good performance (100, 96, 98, 91 y 100%, respectively).
Castro-Perez, Beatriz I.,Estrada-Angulo, Alfredo,Rios-Rincon, Francisco G.,Nunez-Benitez, Victor H.,Rivera-Mendez, Carlos R.,Urias-Estrada, Jesus D.,Zinn, Richard A.,Barreras, Alberto,Plascencia, Alej Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.6
Objective: The objective of this experiment was to evaluate the effect of shade allocation and shade plus fan on growth performance, dietary energy utilization and carcass characteristics of feedlot cattle under tropical ambient conditions Methods: Two trials were conducted, involving a total of 1,560 young bulls (289±22 kg BW) assigned to 24 pens (65 bulls/pen and 6 pens/treatment). Pens were 585 ㎡ with 15 m fence line feed bunks. Shade treatments (㎡ shade/animal) were: i) limited shade (LS) to 1.2 ㎡ shade/animal (LS<sub>1.2</sub>); ii) limited shade to 2.4 ㎡ shade/animal (LS<sub>2.4</sub>); iii) total shade (TS) which correspond to 9 ㎡/animal, and iv) total shade equipped with fans (TS+F). Trials lasted 158 and 183 days. In both studies, the average weekly maximum temperature exceeded 34℃. Results: Increasing shade allocation tended (p = 0.08) to linearly increases average daily gain (ADG), and dry matter intake (DMI, quadratic effect, p = 0.03). This effect was most apparent between LS<sub>1.2</sub> and LS<sub>2.4</sub>. Shade allocation, per se, did not affect gain efficiency or estimated dietary net energy (NE). Compared with TS, TS+F increased (p<0.05) ADG, gain efficiency, and tended (p = 0.06) to increase dietary NE. There was a quadratic effect of shade on longissimus area and marbling score, with values being lower (p<0.01) for LS<sub>2.4</sub> than for LS<sub>1.2</sub> or TS. Likewise, marbling score was lower for TS+F than for TS. Percentage kidney, pelvic, and heart (KPH) linearly decreased with increasing shade. In contrast, KPH was greater for TS than for TS+F. Conclusion: Providing more than 2.4 ㎡ shade/animal will not further enhance feedlot performance. The use of fans in combination with shade increases ADG and gain efficiency beyond that of shade, alone. These enhancements were not associated with increased DMI, but rather, to an amelioration of ambient temperature humidity index on maintenance energy requirement.
James Vu,Jesus Beltran-Perez,Bruce Bordlee 소화기인터벤션의학회 2021 Gastrointestinal Intervention Vol.10 No.3
Gastroduodenal artery steal syndrome is an uncommon complication occurring after orthotopic liver transplantation (OLT) that results in hypoperfusion of the hepatic artery increasing the risk for graft dysfunction. Its non-specific clinical and imaging findings often delay diagnosis and increase the chance for re-transplantation or death. The lack of diagnostic criteria and definitive risk factors for developing the syndrome creates a need for angiography to visualize anatomical and perfusion characteristics indicative of the phenomenon. We present a 47-year-old male who underwent OLT and developed gastroduodenal artery steal a week after surgery. The diagnosis was confirmed with angiogram and successfully treated with coil embolization of the gastroduodenal artery. Arterial steal syndromes should be part of the broad differential when encountered with findings suggestive of an arterial complications in post-OLT patients.
Coupling of nonlinear models for steel-concrete interaction in structural RC joints
Dominguez, Norberto,Perez-Mota, Jesus Techno-Press 2014 Coupled systems mechanics Vol.3 No.2
When strong seismic forces act on reinforced concrete structures, their beam-column connections are very susceptible to damage during the earthquake event. The aim of this numerical work is to evaluate the influence of the internal steel reinforcement array on the nonlinear response of a RC beam-column connection when it is subjected to strong cyclic loading -as a seismic load. For this, two specimens (extracted from an experimental test of 12 RC beam-column connections reported in literature) were modeled in the Finite Element code FEAP considering different stirrup's arrays. In order to evaluate the nonlinear response of the RC beam-column connection, the 2D model takes into account the nonlinear thermodynamic behavior of each component: for concrete, a damage model is used; for steel reinforcement, it is adopted a classical plasticity model; in the case of the steel-concrete bonding, this one is considered perfect without degradation. At the end, we show a comparison between the experimental test's responses and the numerical results, which includes the distribution of shear stresses and damage inside the concrete core of the beam-column connection; in the other hand, the effects on the connection of a low and high state of confinement are analyzed for all cases.
James Vu,Jesus Beltran-Perez,Bruce Bordlee 소화기인터벤션의학회 2021 International journal of gastrointestinal interven Vol.10 No.3
Gastroduodenal artery steal syndrome is an uncommon complication occurring after orthotopic liver transplantation (OLT) that results in hypoperfusion of the hepatic artery increasing the risk for graft dysfunction. Its non-specific clinical and imaging findings often delay diagnosis and increase the chance for re-transplantation or death. The lack of diagnostic criteria and definitive risk factors for developing the syndrome creates a need for angiography to visualize anatomical and perfusion characteristics indicative of the phenomenon. We present a 47-year-old male who underwent OLT and developed gastroduodenal artery steal a week after surgery. The diagnosis was confirmed with angiogram and successfully treated with coil embolization of the gastroduodenal artery. Arterial steal syndromes should be part of the broad differential when encountered with findings suggestive of an arterial complications in post-OLT patients.
William Henry Eskew,Jesus Beltran-Perez,Bruce Bordlee 소화기인터벤션의학회 2024 International journal of gastrointestinal interven Vol.13 No.1
Gastrointestinal (GI) bleeding is a serious complication with a high mortality rate (45%–55%) that can result from a variety of conditions, including portal hypertension, diverticulosis, or splenic vein thrombosis. There are a variety of established treatment strategies for GI bleeds, and there are different indications and contraindications for each. In this case, colonoscopy did not identify any active source of bleeding. Furthermore, because this GI hemorrhage did not involve any shunts, balloon-occluded retrograde transvenous obliteration was not performed. Additionally, a transjugular intrahepatic portosystemic shunt was ruled out due to the poor primary shunt patency rate. Here, we report the treatment of a GI bleed with N-butyl- 2-cyanoacrylate (n-BCA) liquid embolization with no complications. This case demonstrates the potential of using n-BCA to treat small bowel varices.
Prasoon P. Mohan,Jesus Beltran-Perez,Preeti P. Ahlman 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.4
We report a case of gastric variceal hemorrhage where high model for end-stage liver disease score and the complex gastric variceal anatomy precluded the use of both transjugular intrahepatic porto-systemic shunt and standard balloon-occluded retrograde transvenous occlusion (BRTO) procedures respectively. The patient was successfully managed by percutaneous transhepatic coil embolization combined with BRTO. It is of great importance to obtain an accurate cross-sectional image to evaluate the anatomical variances of gastric varices that will lead to appropriate vascular access and to chose a suitable embolization method.