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Electrochemical reduction of Cr(Ⅵ)in the presence of sodium alginate and its application in water purification

Journal of Environmental Sciences 2021年第3期33卷 304-312页

作者： Bryan Butter Paola Santander guadalupe del cpizarro Diego POyarzún Federico Tasca Julio Sánchez Facultad de Química y Biología Universidad de Santiago de ChileUSACHCasilla 40Correo 33SantiagoChile Departamento de Química Universidad Tecnológica MetropolitanaJ.P.Alessandri 1242SantiagoChile Laboratorio de Nanotecnología Recursos Naturales y Sistemas ComplejosFacultad de Ciencias NaturalesUniversidad de AtacamaCopayapu 485CopiapóChile

Chromium(Cr)is used in many manufacturing processes,and its release into natural waters is a major environmental problem *** concentrations of Cr(Ⅵ)are toxic to human health and living organisms due to the carcinogenic and mutagenic nature of this *** work examined the conversion of Cr(Ⅵ)to Cr(Ⅲ)via electrochemical reduction using gold electrode in an acidic sodium alginate(SA)solution and subsequent removal of the produced Cr(Ⅲ)-SA by the polymer-enhanced ultrafiltration(PEUF)technique.A solution of SA in nitric acid was used both as an electrolytic medium during the voltammetric measurements and bulk electrolysis and as an extracting agent during the PEUF *** electroanalysis of Cr(Ⅵ)was performed by linear sweep voltammetry in the presence of acidic SA solution to study its voltammetric behavior as a function of the Cr(Ⅵ)concentration,pH,presence of Cr(Ⅲ),SA concentration and scan *** addition,the quantitative reduction of Cr(Ⅵ)to Cr(Ⅲ)was studied through the bulk electrolysis *** results showed efficient reduction with well-defined peaks at approximately 0.3 V ***/AgCl,using a gold working *** the pH increased,the reduction signal strongly decreased until its *** optimum SA concentration was 10 mmol/L,and it was observed that the presence of Cr(Ⅲ)did not interfere in the Cr(Ⅵ)*** the quantitative reduction by bulk electrolysis in the presence of acidic SA solution,it was possible to reduce all Cr(Ⅵ)to Cr(Ⅲ)followed by its removal via PEUF.

关键词： Alginate solution Chromium Electroanalytical chemistry Ultrafiltration Water purification

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-592 and -1082 interleukin-10 polymorphisms in pulmonary tuberculosis with type 2 diabetes

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Asian Pacific Journal of Tropical Medicine 2013年第7期6卷 505-509页

作者： guadalupe García-Elorriaga Leila Vera-Ramírez Guillermo del Rey-Pineda Csar Gonzlez-Bonilla Unidad de Investigación Mdica en Inmunología e Infectología Hospital de InfectologíaCentro Mdico Nacional La Raza(CMNR)Instituto Mexicano del Seguro Social(IMSS)Mexico CityMexico Banco Central de Sangre CMNRIMSSand Departamento de Infectología.Hospital Infantil de Mxico Federico Gómez.Secretaría de Salud(SSA) Mexico City.Mexico

Objective:To determine the polymorphisms of Interleukin-10(IL-10)(-592,-1082) in pulmonary tuberculosis(PTB)with and without type 2 diabetes(T2D).Methods:We studied a Mexican mestizo population of 37 patients with TB in remission(TBr) and 40 with active pulmonary TB (PTB),21 patients with TB + T2D.47 blood donors accepted,and 13 healthy health-care workers with tuberculin skin lest *** of IL-10 polymorphisms was performed by real-lime Polymerase chain ***:IL-10-592C/A presented in a greater proportion in healthy individuals than in patients with type 2 diabetes and TB in a not quite significant statistically ***-10-1082A/A presented more frequently in the group of patients with both diseases,not being statistically significant in comparison with the group of healthy subjects. Conclusions:This study describes two important new ***,it reveals that the IL-10 (-592 A/A and -592 C/C) polymorphisms were found in a greater proportion in a group of patients with T2D and TB than in healthy ***,the study provides evidence that the(-1082 G/G) polymorphism presented with greater frequency in healthy individuals than in patients with both ol these diseases.

关键词： Cytokines IL-10 Polymorphism Genotype Pulmonary tuberculosis

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Interferon γ in patients with HIV/AIDS and suspicion or latent tuberculosis infection

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Asian Pacific Journal of Tropical Medicine 2013年第2期6卷 157-160页

作者： guadalupe Garcia-Elorriaga Mayte Martinez-Velazquez Veronica Gaona-Flores Guillermo del Rey-Pineda Cesar Gonzalez-Bonilla Unidad de Investigacion en Inmunologia e Infectologia Centro Medico Nacional La Raza(CMNR)Instituto Mexicano del Seguro Social(IMSS) Mexico CityMexico Hospital de Infectologia CMNRIMSSMexico CityMexico Banco Central de Sangre CMNR.Hospital Infantil de MexicoFederico Gomez.Dpto.de Infectologia

Objective:To assess the usefulness of IGRA test(QuantiFERON? -Cell mediated immune) compared with the tuberculin skin ***:A cross-sectional study was carried out in Mexico,25 infected patients with HIV-AIDS and the suspicion or with latent tuberculous infection （LTBI） who were>18 years of age and without treatment for tuberculosis（TB）,were enrolled in the ***:Median cluster of differentiation（CD4） count was 364 cells/μL and median HIV viral load was 50 copies/***,20 patients（80%） had at least one positive diagnostic test for LTBI:four（16%） had a positive tuberculin skin test and 19（76%）,a positive QuantiFERON ? -***:No agreement is found between the two diagnostic tests:k = -0.004,95%confidence interval（-0.2219,0.2210）.Additional longitudinal studies among HIV-infected populations with high prevalence of TB are needed to further assess the usefulness of IGRAs in this patient population.

关键词： AIDS HIV IGRA Interferonγ Latent tuberculosis infection

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Insights into the structural biology of G-protein coupled receptors impacts drug design for central nervous system neurodegenerative processes

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Neural Regeneration Research 2013年第24期8卷 2290-2302页

作者： Farfán-García Eunice Dalet Trujillo-Ferrara José guadalupe Castillo-Hernández María del Carmen Guerra-Araiza Christian Humberto Soriano-Ursúa Marvin Antonio Escuela Superior de Medicina Instituto Politécnico Nacional. Plan de San Luis y Díaz Mirón s/n Col. Casco de Santo Tomas

In the last few years, there have been important new insights into the structural biology of G-protein coupled receptors. It is now known that allosteric binding sites are involved in the affinity and selec- tivity of ligands for G-protein coupled receptors, and that signaling by these receptors involves both G-protein dependent and independent pathways. The present review outlines the physiological and pharmacological implications of this perspective for the design of new drugs to treat disorders of the central nervous system. Specifically, new possibilities are explored in relation to allosteric and or- thosteric binding sites on dopamine receptors for the treatment of Parkinson＇s disease, and on muscarinic receptors for Alzheimer＇s disease. Future research can seek to identify ligands that can bind to more than one site on the same receptor, or simultaneously bind to two receptors and form a dimer. For example, the design of bivalent drugs that can reach homo/hetero-dimers of D2 dopa- mine receptor holds promise as a relevant therapeutic strategy for Parkinson＇s disease. Regarding the treatment of Alzheimer＇s disease, the design of dualsteric ligands for mono-oligomeric mus- carinic receptors could increase therapeutic effectiveness by generating potent compounds that could activate more than one signaling pathway.

关键词： neural regeneration G-Protein coupled receptors structural biology drug design neurodegenera-tive disorders , oligomedzation biased signaling Parkinson's disease Alzheimer's disease dopa-mine receptors muscarinic receptors grants-supported paper neuroregeneration

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Clinical,radiological and molecular diagnosis correlation in serum samples from patients with osteoarticular tuberculosis

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Asian Pacific Journal of Tropical Biomedicine 2014年第7期4卷 581-585页

作者： guadalupe Garcia-Elorriaga Olga Martinez-Elizondo Guillermo del Rey-Pineda Cesar Gonzalez-Bonilla Unidad de Investigacion Medica en Inmunologia e Infectologia Hospital de InfectologiaCentro Medico Nacional La Raza(CMNR).Instituto Mexicano del Seguro Social(IMSS)Mexico City.Mexico(Medical Research Unit in Immunology and Infectious DiseaseHospital for Infectious Disease"La Raza"National Medical Center(CMNR).Mexican Social Security Institute(IMSS)Mexico CityMexico) Hospital de Ortopedia "Dr.Victorio de la Fuente Narvaez" Instituto Mexicano del Seguro Social(IMSS)Mexico CityMexico(Orthopedics Hospital " Dr.Victorio de la Fuente Narvaez"Mexican Social Security Institute(IMSS)Mexico CityMexico) Banco Central de Sangre CMNRIMSSand Departamento de InfectologiaHospital Infantil de Mexico Federico Gomez.Secretaria de Salud(SSA)Mexico CityMexico(Central Blood BankCMNR.IMSS and Department of Infectious Disease "Federico Comez" Children's Hospital.Health Ministry (SSA)Mexico CityMexico)

Objective:To assess the role of polymerase chain reaction(PCR)in serum sauples,in the diagnosis of osteoarticular tuberculosis(OTB)in a setting where only clinical and imaging diagnoses determine the ***:A total of 44 consecutive serum specimens were collected from clinically suspected OTB patients,based on clinical and radiological[X-ray or magnetic resonance imagng/computecl tomography]*** were scrcened by in-house nested *** addition,a few specimens were examined by Gram stain,acid-fast bacilli stain,histand routine bacterial culture.A total of 39 specimens were collected from patients suffering from other bone diseases of nontuberculous origin and included as negative ***:of the 44 clinically suspected OTB patients,in-house nested PCR was positive in 40(91%)cases;PCR was negative in 38(97%)negative *** and specificity of our in—house nested PCR was 90.3%and 97.4%,*** PCR report was available within 48 *** was possible to standardize serum PCR technique and in positive cases,a good n was observed in terms of an adequate treatment ***:Nested PCR in serum samples is a rapid,highly sensitive and specific modality for OTB detection,PCR should be performed in addition to clinical evaluation,imaging studies,acidfast bacilli staining,culture and histopathology diagnosis,if possible.

关键词： Osteoarticular tuberculosis Molecular diagnosis Nested polymerase chain reaction Sensitivity Specificity

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Tuberculosis and hematopoietic stem cell transplant: Review of a difficult and often underestimated problem

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World Journal of Clinical Infectious Diseases 2013年第4期3卷 70-78页

作者： guadalupe García-Elorriaga Guillermo del Rey-Pineda Hospital for Infectious Disease "La Raza" National Medical Center Department of Infectious Disease and Intestinal Bacteriology Laboratory "Federico Gómez"Children’s HospitalDepartment of Health Central Blood Bank "La Raza"National Medical Center Social Security Mexican Institute

Recipients of solid organ transplants(SOT) and stem cell transplants(SCT) constitute a group of patients at risk for tuberculosis(TB) development. The prevalence of active TB in patients undergoing SOT is higher than in patients undergoing SCT, probably due to the shorter period of immunosuppression in the latter. We reviewed the importance of SCT in individuals with hematological malignancies. Most TB cases occur in transplant patients by reactivation of latent infection after immunosuppression, most often within the first year after transplant, leading to graft loss and in some cases, death. Relevant variables to assess the risk of TB infection in a transplant recipient include the donor's and recipient's medical histories, imaging results, microbiology and tuberculin skin test(TST) and interferon-gamma release assays(IGRA). TST is routinely performed in the donor and recipient before transplantation. If TST is > 5 mm in the recipient or > 10 mm in the donor, it is necessary to exclude active TB(pulmonary and renal). Chemopro-phylaxis is recommended in TST(+) recipients and in recipients with recent seroconversion, in donors with a history of untreated TB or in contact with an individual with active TB, if radiological images are suspicious and the IGRA is(+). The drug of choice is isoniazid. These topics are herewith reviewed.

关键词： Tuberculosis Prophylaxis Transplant Solid organ transplantation Hematopoietic stem cell transplantation

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Analysis of the Potential for Internationalization of a Medium Enterprise in the Mexican Footwear Sector

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Journal of Modern Accounting and Auditing 2017年第1期13卷 35-43页

作者： Maria guadalupe Arredondo-Hidalgo Diana del Consuelo Caldera-Gonzalez Universidad de Guanajuato Guanajuato Mexico

This research is a longitudinal case study with descriptive scope and mixed methodology： quantitative and qualitative. The aim of this paper is to analyze the potential for internationalization of a medium-sized enterprise （SME） in the footwear sector in the city of Leon Guanajuato, Mexico, in order to identify the feasibility of carrying out the plans of international trade. An analysis of both the industry and the organization was made. SME has an incipient experience for the US market. The results show that the company has potential for internationalization, but insertion into other markets must be gradual, given the nature of the organization, and must be formally planned.

关键词： internationalization enterprise strategies SMEs

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Probabilistic Model of Cumulative Damage in Pipelines Using Markov Chains

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Journal of Applied Mathematics and Physics 2020年第4期8卷 620-642页

作者： Francisco Casanova-del-Angel Esteban Flores-Méndez Karina guadalupe Cortes-Yah Sección de Estudios de Posgrado e Investigación. Escuela Superior de Ingeniería y Arquitectura Unidad Profesional ALM Instituto Politécnico Nacional Ciudad de México Mexico

This paper presents a probabilistic model of cumulative damage based on Markov chains theory to model propagation of internal corrosion depth localized in a hydrocarbons transport pipeline. The damage accumulation mechanism is unit jump type, depending on the state. It uses a shock model based on Bernoulli trials and probabilities to remain in the same state or the next one. Data are adjusted to Lognormal distribution and proven with a Kolmogórov-Smirnov test. The vector obtained from multiplying the initial state vector with the transition matrix was developed and the system of equations to find each transition probability with a single inspection report was solved. In order to calculate propagation of internal corrosion after inspection, an exponential equation was proposed and a parameter was adjusted to the data. Time to expected failure was obtained by adding the time expected in each damage state. Each time step was adjusted to real time.

关键词： Localized Corrosion Cumulative Damage Failure Pipelines Markov Chains

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Strategic Analysis to Develop an Internationalization Plan for a Small Construction Company in Guanajuato,Mexico

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Chinese Business Review 2018年第5期17卷 209-222页

作者： María guadalupe Arredondo-Hidalgo Diana del Consuelo Caldera-González Gerardo Alvarez-Valadez Universidad de Guanajuato GuanajuatoMéxico Universidad Iberoamericana León GuanajuatoMéxico

Nowadays internationalization is no longer a luxury for companies and becomes a necessity in order to survive in the market and ensure its durability over *** justifies the structure of a internationalization plan(IP)for a small company(SEC),in order to modify its value curve against the competition and guarantee a sustained growth development in new *** paper presents a strategic analysis of a small construction company dedicated to the elaboration of finishes for walls,floors,and concrete architecture.A situational analysis was carried out to see what would be the most appropriate international strategy for the ***,such as:(a)SWOT(strengths,weaknesses,opportunities,threats)Analysis,(b)PEST(political,economic,social,and technological)Analysis,(c)Internal Factors Evaluation Matrix(IFE),and(d)External Factors Evaluation Matrix(EFE Assessment Matrix),were used to identify the current standing of the *** canvas model and the competitive profile matrix were used to make the connection with the strategic position of the SEC against the desire of ***,an analysis of the external factors was carried out showing a significant growth of 4.6%in the specialized sub-sector,as well as a tense business landscape driven by the political situation between Mexico and the United States.

关键词： small enterprise strategies internationalization

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Susceptibility to gravitational processes due to land cover change in the Río Chiquito-Barranca del Muerto subbasin(Pico De Orizaba Volcano, México)

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Journal of Mountain Science 2017年第12期14卷 2511-2526页

作者： alanis-anaya rocío marisol legorreta-paulin gabriel mas jean francois granados-ramirez guadalupe rebeca college of geography faculty of philosophy and lettersnational autonomus university of mexico(unam)Mexico City 04510Mexico department of physical geography institute of geographynational autonomus university of mexico(unam)Mexico City 04510Mexico center for research in environmental geography national autonomus university of mexico(unam)Mexico City 58190Mexico

instability associated Land cover change can lead to slope by accelerating erosive processes with agriculture, forestry, and infrastructure. The Rio Chiquito-Barranca del Muerto subbasin has experienced an increase in land cover change due to government programs and the establishment of agricultural and urban areas. The aim of this study was to provide a model to map the susceptibility to gravitational processes along sites where anthropogenic land cover change has occurred. The method was based on the stratification of the subbasin according to landforms and cartographic variables. These variables were used in a multi- criteria assessment to assign weights according to their contribution to the onset of new gravitationalprocesses. Those weights were used to create a susceptibility map based on a weighted linear sum. The accuracy of the resulting map was validated in an error matrix with a random stratified design based on susceptibility classes per landform. The results produced a map of areas with susceptibility to gravitational processes due to land cover change; this susceptibility is very high in the undifferentiated pyroclastic slope and limestone mountain, where it derives not only from anthropogenie effects on natural vegetation cover, but also from steep slopes, weathered materials, low apparent density, high erosivity, and previous gravitational processes. The results support other studies that concluded that loss of vegetation is a triggering factor in the formation of gravitational processes, but also show that excessive reforestation can increase gravitational processes.

关键词： Gravitational processes susceptibility Land cover change Multi-criteria assessment Pico de Orizaba volcano

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