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Algorithms for Computing Some Invariants for Discrete Knots

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Applied Mathematics 2013年第11期4卷 1526-1530页

作者： Gabriela Hinojosa David Torres rogelio valdez Facultad de Ciencias Universidad Autónoma del Estado de Morelos Cuernavaca México

Given a cubic knot K, there exists a projection? of the Euclidean space R3?onto a suitable plane ?such that p(K) is a knot diagram and it can be described in a discrete way as a cycle permutation. Using this fact, we develop an algorithm for computing some invariants for K: its fundamental group, the genus of its Seifert surface and its Jones polynomial.

关键词： Cubic Knots Discrete Knots Algorithms

Determining the need for a thoracoscopic approach to treat a giant hiatal hernia when abdominal access is poor

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World Journal of Gastrointestinal Surgery 2023年第12期15卷 2739-2746页

作者： Francisco Javier Pérez Lara rogelio Zubizarreta Jimenez Tatiana Prieto-Puga Arjona Pilar Gutierrez delgado Juan Manuel Hernández Carmona Jose Manuel Hernández Gonzalez Maria Pitarch Martinez Department of Surgery Hopital de AntequeraAntequera 29200Spain DOXA MicrofluidicsRincon de la Victoria 29730Spain Department of Surgery HRU Carlos HayaUnidad Cirugia Hepatobiliopancreat&TrasplantesMalaga 29200Spain

BACKGROUND Giant hernias present a significant challenge for digestive *** approach taken(laparoscopic vs thoracoscopic)depends largely on the preferences and skills of each surgeon,although in most cases today the laparoscopic approach is *** To determine whether patients presenting inadequate laparoscopic access to the intrathoracic hernial sac obtain poorer postoperative results than those with no such problem,in order to assess the need for a thoracoscopic *** For the retrospective series of patients treated in our hospital for hiatal hernia(n=112),we calculated the laparoscopic field of view and the working area accessible to surgical instruments,by means of preoperative imaging tests,to assess the likely outcome for cases inaccessible to *** Patients with giant hiatal hernias for whom a preoperative calculation suggested that the laparoscopic route would not access all areas of the intrathoracic sac presented higher rates of perioperative complications and recurrence during follow-up than those for whom laparoscopy was *** difference was statistically ***,the insertion of mesh did not improve results for the non-accessible *** For patients with giant hiatal hernias,it is essential to conduct a preoperative evaluation of the angle of vision and the working area for *** parts of the intrathoracic sac are inaccessible laparoscopically,the thoracoscopic approach should be considered.

关键词： Hiatal hernia Abdominal surgery Laparoscopy Thoracoscopy surgery

Green Synthesis of Silver Nanoparticles Using Annona diversifolia Leaf Extract and Their Antimicrobial Application

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Journal of Renewable Materials 2020年第9期8卷 1129-1137页

作者： rogelio Solorzano-Toala Daniel Gonzalez-Mendoza Benjamin valdez-Salas Vianey Mendez-Trujillo Federico Gutierrez-Miceli Ernesto Beltran-Partida Olivia Tzintzun-Camacho Tecnológico Nacional de México-Campus Tuxtla Gutiérrez Tuxtla Gutiérrez03940México Instituto de Ciencias Agrícolas de la Universidad Autónoma de Baja California Mexicali21705México Instituto de Ingeniería de la Universidad Autónoma de Baja California Mexicali21100México Facultad de Medicina de la Universidad Autónoma de Baja California Mexicali21100México

The aim of this study was the synthesis of silver nanoparticle using Annona diversifolia *** silver nanoparticles obtained were analyzed by spectroscopic methods and dynamic light scattering *** inhibition of AgNPs was evaluated against Bacillus cereus,Klebsiella pneumoniae and Enterobacter *** results showed that AgNPs have high values at 3 keV and particle size between 45 to 58 nm with a homogenous *** AgNPs showed growth inhibition against Klebsiella pneumoniae and Enterobacter *** studies are needed to confirm the potential antimicrobial of different AgNP from *** in Gram negative and Gram positive bacteria.

关键词： Green chemistry AgNPs plants antimicrobial biotechnology

COVID-19 pandemic,as experienced in the surgical service of a district hospital in Spain

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World Journal of Clinical Cases 2021年第23期9卷 6582-6590页

作者： Francisco Javier Pérez Lara Maria Belen Jimenez Martinez Francisco Pozo Muñoz Andres Fontalba Navas rogelio Garcia Cisneros Maria Jose Garcia Larrosa Ignacio Garcia delgado Maria del Mar Callejon Gil Department of Surgery Hopital de AntequeraAntequera 29200MálagaSpain North Malaga Healthcare District Hopital de AntequeraAntequera 29200MálagaSpain

The coronavirus disease 2019,which is caused by severe acute respiratory syndrome coronavirus 2,was first identified in December 2019 in Wuhan,China,and has since spread rapidly,evolving into a full-blown *** would like to report our experience after 1 year of this pandemic in the surgical service of a district hospital in *** have been many changes(including new protocols)that our service and the hospital have undergone,to adapt to the new *** believe that this experience can be useful for other professionals who have lived and are living a similar situation.

关键词： COVID-19 Hospital Experience Surgery Service Treatment

The Phenols of the Genus <i>Agave</i>(Agavaceae)

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Journal of Biomaterials and Nanobiotechnology 2013年第3期4卷 9-16页

作者： Norma Almaraz-Abarca Eli Amanda delgado-Alvarado José Antonio ávila-Reyes José Natividad Uribe-Soto Laura Silvia González-valdez Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional Unidad Durango Instituto Politécnico Nacional Durango Dgo México

A review is presented about the studies that have been carried out on the phenolic composition of the species of the genus Agave in order to show which species of the genus has been analyzed, what is the potential of the species of Agave as source of phenolics with important biological activities, and what is the significance of the phenolic profiles as chemotaxonomic markers in the genus. The results of the analysis of a dozen of Agave species reveal an important richness of phenolic compounds, including flavonoids, homoisoflavonoids, and phenolic acids, and a broad diversity of biological activities associated to those compounds, as antioxidant, antibacterial, antifungal, antinematod, and immunomodulatory capabilities. The phenols of Agave also have a major potential as specific chemotaxonomic markers.

关键词： Genus Agave Phenol Profiles Homoisoflavanoids Biological Activity Chemotaxonomic Markers

A nitrogen index for improving nutrient management within commercial Mexican dairy operations

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International Soil and Water Conservation Research 2016年第1期4卷 1-5页

作者： Uriel Figueroa-Viramontes Jorge A.delgado Juan I.Sánchez-Duarte Esmeralda Ochoa-Martínez Gregorio Núñez-Hernández INIFAP Campo Experimental La LagunaBoulevard JoséSantos Valdez#1200 Pte.Col.CentroMatamoros C.P.27440Matamoros CoahuilaMexico USDA ARS2150 Centre AvenueBuilding DFort CollinsCO 80526United States

Some intensive dairy operations in Mexico are contributing to large,negative environmental impacts,especially in regions dominated by high concentrations of *** manure inputs plus additional nitrogen(N)fertilizer has,in some cases,resulted in background nitrate–nitrogen(NO3–N)levels in irrigation water that are so high,it is not safe for human *** reason is that commercial farmers in this region are currently not using any method to rapidly calculate N budgets based on their practices,N inputs and/or crop N *** Nitrogen Index,a quick tool that can be used to conduct an assessment within a few minutes,was developed for Mexico,but needed further testing under commercial field *** conducted studies in 2010 and 2011 and collected soil and crop information from several commercial farming operations to test the *** index accurately assessed(Po0.0001)residual soil nitrate after harvesting corn(Zea mays L.)and oats(Avena sativa L.);and also accurately assessed the N uptake of these crops(Po0.01).The Mexico N Index is a tool that can be used to quickly conduct N balances,show when N is being over-applied,and help reduce over-application,thus reducing N losses to the environment and improving management of dairy forage systems in Mexico.

关键词： Corn Forage systems Manure Mexico Nitrate leaching Nitrogen Index