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Relationship of Fatigue Crack Propagation to Dislocation Structure and Slip Geometry

Journal of Materials Science & Technology 1997年第5期13卷 367-373页

作者： Laird, Campbell peralta, pedro Dept. of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104-6272 United States Center for Materials Science Los Alamos National Laboratory Mail Stop K765 Los Alamos NM 87545-0001 United States

The mechanisms of fatigue crack propagation are breifly reviewed in relation to Professor McClintock's contributions to the early development of the field. The most securely established understanding has been obtained for those mechanisms of propagation involving plasticity-inducedgeometrical changes to the crack tip during tensile and compressive straining (the plastic blunting process). The roles of more complex factors in controlling the kinetics of crack propagation,which cause the magnitude of the Paris exponent to exceed 2, remain to be elucidated. Recentlyobtained results revealing the interconnection between the slip behaviour at the crack tip, theplastic blunting process and the dislocation structures present in the material before the crackencounters them are reported.

关键词： App ASTM STP Relationship of Fatigue Crack Propagation to Dislocation Structure and Slip Geometry Wang

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Alginate modifies the physiological impact of CeO2nanoparticles in corn seedlings cultivated in soil

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Journal of Environmental Sciences 2014年第2期26卷 382-389页

作者： Lijuan Zhao Jose R.peralta-Videa Bo Peng Susmita Bandyopadhyay Baltazar Corral-Diaz pedro Osuna-Avila Milka O.Montes Arturo A.Keller Jorge L.Gardea-Torresdey Chemistry Department The University of Texas at El Paso 500 West University Avenue University of California Center for Environmental Implications of Nanotechnology The University of Texas at El Paso 500 West University Avenue Environmental Science and Engineering PhD program The University of Texas at El Paso 500 West University Avenue Department of Biological Sciences The University of Texas at El Paso 500 West University Avenue Universidad Aut'onoma De Ciudad Ju'arez Plutarco Elias Calles # 1210 Fovissste Chamizal. Ciudad Juarez Chihuahua 32310 Mexico Chemistry Department University of Texas of the Permian Basin Odessa Bren School of Environmental Sciences and Management 3420 Bren Hall University of California

Alginates are naturally occurring components of organic matter in natural soil whose effects on nanoparticle （NP） toxicity to plants is not well understood. In the present study, corn plants were grown for one month in soil spiked with 400 mg/kg CeO2 NPs with various alginate concentrations. After one month of growth in the NPs impacted soil, plants were harvested and analyzed for Ce and mineral element concentrations. Chlorophyll concentration and heat shock protein 70, used as biomarkers for oxidative stress, were also evaluated. Results showed that, compared to CeO2 NPs treatment, alginate at 10, 50, and 100 mg/kg increased Ce concentration in roots by approximately 46%, 38%, and 29% and by 115%, 45%, and 56% in shoots, respectively. CeO 2 NPs without alginate increased Mn accumulation in roots by 34% compared to control. CeO2 NPs with low and medium alginate increased Mn by ca. 92% respect to NPs without alginate and by ca. 155% respect to control. CeO2 NPs without/with alginate significantly increased accumulation of Fe and Al in roots. In addition, alginate at 50 mg/kg increased Zn accumulation in roots by 52% compared to control. In shoots, K increased at all NP treatments but the accumulation of other elements was not affected. Alginate enlarged the impact of CeO2 NPs to corn plants by reducing chlorophyll a content and triggering overexpression of heat shock protein 70.

关键词： CeO2 NPs alginate nutrient uptake chlorophyll heat shock protein

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Comparison of Two Pour-On Formulations of Ivermectin against Gastrointestinal Worms, Fleas and Lice in Naturally Infected Stray Dogs

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Pharmacology & Pharmacy 2015年第3期6卷 177-184页

作者： Froylán Ibarra-Velarde Yolanda Vera-Montenegro Joaquín Ambía Medina Karla Sánchez-peralta pedro Ochoa Galván Departamento de Parasitología Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autónoma de México México D.F. México Laboratorio Salud Animal México D.F. México Departamento de Génetica Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autónoma de México México D.F. México

The aim of the present study was to evaluate the efficacy of two commercial pour-on ivermectin formulations against intestinal parasites (IP), fleas and lice in naturally infested stray dogs. Eighteen crossbreed dogs with eggs of IP as well as adult fleas and lice were included in the trial. On day 0, the dogs were randomly divided into 3 groups of 6 animals each: a group receiving a single pour-on treatment with 0.5% ivermectin (500 mcg/kg), a group treated similarly with 0.2% iver-mectin (200 mg/kg), and a control group. Fecal and skin analyses were carried out on days 0, 7, 14, 21 and 28 to determine the reduction of eggs and the number of fleas and lice. Weight gain was also measured on day 28. On day 30, the dogs were humanely sacrificed in order to count adult IP. Efficacy was measured as the percentage of the reduction of eggs per gram fecal mass (EPGF), of adult IP, fleas and lice relative to the control group. For the eggs of IP, ivermectin at 0.5% showed an efficacy of 100% against ascarids and 79% against Ancylostoma caninum. ivermectin at 0.2% removed 90.2% of the ascarids and 50.4% of A. caninum. For adult IP, the efficacy of 0.5% iver-mectin against Toxocara canis and A. caninum was 100%, and for 0.2% ivermectin it was 62.4% and 76.4% for T. canis and A. caninum, respectively. Both compounds were 100% effective against lice and 96% and 71.1% efficacious against fleas, respectively. However, neither treatment was effective against Dypilidium caninum. Weight gain in treated dogs was statistically different from that of the controls (p < 0.05). We concluded that 0.5% pour-on ivermectin showed better efficacy than 0.2% pour-on ivermectin in the reduction of eggs and adult intestinal parasites and fleas;it was similarly efficacious against lice.

关键词： Ivermectin Intestinal Worms Fleas and Lice Stray Dogs

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Digital Intubation without Stylet: Myth or Reality? Case Report

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Open Journal of Anesthesiology 2021年第5期11卷 156-163页

作者： Maya Christiam Mauricio Jesús Alberto Melendez Ordoñez Ismael Bernardo Viveros peralta Villanueva Verónica Juan José Dosta Herrera Andrea Carolina Jimenez Palacios Jimmy Andersson Delgado Criollo Monserrat Escalante Rodríguez Dalia Fernanda Farrera Rámirez Maribel Méndez Suarez pedro Sánchez Mata Residente de Anestesiología Hospital Juárez de México Ciudad de México México Médico adjunto al Servicio de Anestesiología Unidad Médica de Alta Especialidad (UMAE) Hospital General Doctor Gaudencio Jefe del Servicio de Anestesiología Unidad Médica de Alta Especialidad (UMAE) Hospital General Doctor Gaudencio González Garza (LA RAZA) Ciudad de México México

Digital intubation was discovered as one of the first methods to face a difficult airway without direct laryngoscopy. From the very beginning, this technique has been surrounded by much controversy, mainly because it required to be performed by an expert. Nowadays, it remains a useful technique when treating patients with difficult airways, so it is of utmost importance all personnel involved with airway management must know and perfect this technique when scenarios where conventional laryngoscopy or rescue devices for difficult airway are not available or contraindicated. The present work’s main objective is to suggest digital intubation as a safe and effective technique for the management of patients with difficult airways when there are no other devices available. The authors present a successful case of digital intubation on a patient with a difficult airway, demonstrating this technique is useful when performed by expert practitioners and when there is no other equipment available.

关键词： Intubation Intratracheal Oxygenation Anesthesia Airway Management

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