CONDICIONES Y CONSECUENCIAS DE LA MIGRACIÓN DE RETORNO INVERSOR CONTEMPORÁNEO EN HUANDACAREO, MICHOACÁN, MÉXICO

Eduardo Fernández Guzmán Institute of Iberoamerican Studies Pusan Universit 2013 International Journal of Latin American Studies Vol.3 No.1

Abstract. The total corpus of migration studies, research on return migration is scarce. Manufacturing are more recent, and although they have addressed their theoretical and methodological issues, and have explored themes and specific angles such as remigration, internal return, ethnic, retirees, professionals, transnationalism, gender, cultural, psychological, statistical, sick, studies comparative studies on investor returns are very few. And have been addressed from an economic or sociological. Is virtually absent historical analysis of the causes and consequences of investor return home communities around the world. This article, based on a case study in Michoacán, aims to uncover the causes and consequences of recent history in investor return migration at different levels of structural analysis. Palabras clave: migración internacional, migración de retorno, retorno inversor, macroestructuras, mesoestructuras, microestructuras, cambio social. Keywords: international migration, return migration, return investor, macro, mesostructures, microstructures, social change. Resumen. En el corpus total de los estudios sobre migración, las investigaciones sobre migración de retorno son escasas. Son de manufactura más reciente, y aunque han abordado su problemática teórico-metodológica, y han indagado temáticas y ángulos muy concretos tales como remigración, retorno interno, étnico, jubilados, profesionistas, transnacionalismo, género, culturales, psicológicos, estadísticos, enfermos, estudios comparativos, los estudios sobre retorno inversor son muy pocos. Y se han abordado desde una perspectiva económica o sociológica. Está prácticamente ausente el análisis histórico de las causas y consecuencias del retorno inversor en las comunidades de origen alrededor del mundo. Este artículo, basado en un estudio de caso en Michoacán, pretende develar las causas y consecuencias de la historia del presente de la migración de retorno inversor en sus diferentes niveles de análisis estructural.

SUBNATIONAL DYNAMICS IN NORTH AMERICA: PARADIPLOMACY OF CANADIAN PROVINCES

Víctor Hugo Guzmán Horta(Víctor Hugo Guzmán Horta ) 한국캐나다학회 2022 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.28 No.2

Impact of Education and Culture on Entrepreneurship

Guzmán Sánchez,Francisco José,Hanyang University,ang-Myung,Lee 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.9

This paper explored the impact of secondary education level and national culture on the entrepreneurial activities. Specifically, we examine how higher education and one dimension of national culture (individualist-collectivist orientation) are related to the ratio of opportunity-entrepreneurship in a country. The research model is developed as: high education and individualism are positive determinants of the entrepreneurial activity, but only when the motivation for starting new ventures is opportunity or improvement and not when people do it for necessity. Our variables were developed with GEM data, World Economic Forum's Global Competitiveness Report and Hofstede's cultural determinants for 57 countries for the years 2009, 2010 and 2011, and we test our hypothesis empirically. In addition to our testing independent variables, we added 3more control variables, economic freedom, and perception of corruption and property rights, in order to specify our findings. Our analysis proves that higher education and individualism are determinants for superior opportunity entrepreneurial activity. Education levels and individualism, however, do not show the interaction effect. Our results show that, after controlling for other entrepreneurship determinants variables borrowed from the institutional theory of entrepreneurship, education at the tertiary level i.e., university, college, etc., positively affects the choice of individuals to pursue opportunity driven entrepreneurship. Moreover, individualism is also found to positively affect entrepreneurs' choice. We hope this research contribute in expanding our understanding on global entrepreneurship activities.

Expression of heat shock protein genes in Simmental cattle exposed to heat stress

Guzmán Luis Felipe,Martínez-Velázquez Guillermo,Villaseñor-González Fernando,Vega-Murillo Vicente Eliezer,Palacios-Fránquez José Antonio,Ríos-Utrera Ángel,Montaño-Bermúdez Moisés 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.5

Objective: In tropical, subtropical and arid zones, heat stress is the main cause of productivity reduction in cattle. When climate stressors occur, animals become thermal adapted through differential expression of some genes, including heat shock proteins (HSP) family. The aim of this study was to determine levels of expression of HSP60, HSP70, and HSP90 genes in Simmental cattle raised in tropical environments of Mexico. Methods: In this study, expression of HSP60, HSP70, and HSP90 genes was analyzed in 116 Simmental cattle from three farms with tropical climate located in western Mexico. Animals were sampled twice a day, in the morning and noon. Gene expression was evaluated by quantitative polymerase chain reaction using probes marked with fluorescence. The MIXED procedure of SAS with repeated measures was used for all statistical analysis. Results: HSP60 gene expression differences were found for sex (p = 0.0349). HSP70 gene differences were detected for sampling hour (p = 0.0042), farm (p<0.0001), sex (p = 0.0476), and the interaction sampling hour×farm (p = 0.0002). Gene expression differences for HSP90 were observed for farm (p<0.0001) and year (p = 0.0521). HSP70 gene showed to be a better marker of heat stress than HSP60 and HSP90 genes. Conclusion: Expression of HSP70 gene in Simmental herds of the tropical region of western México was different during early morning and noon, but the expression of the HSP60 and HSP90 genes was similar. Identification of resilient animals to heat stress will be useful in the genetic improvement of the Simmental breed.

Effect of Oseltamivir on Catecholamines and Select Oxidative Stress Markers in the Presence of Oligoelements in the Rat Brain

David Calderón Guzmán,Ernestina Hernández García,Norma Osnaya Brizuela,Francisca Trujillo Jiménez,Gerardo Barragán Mejía,Daniel Santamaría del Ángel,Elvira Nuñez A,Liliana Carmona Aparicio,Hugo Juárez 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.10

The effect that osteltamivir has on the metabolism of catecholamines and oxidative damage in the brains of young patients remains unclear. The purpose of this study was to measure the effects of oseltamivir, in the presence of oligoelements, on biogenic amines and select oxidative biomarkers in the brains of uninfected, young rats under normal conditions. The study was conducted using male Wistar rats intraperitoneally treated for three days with either a control dose of 0.9 % NaCl, oseltamivir (50 mg/kg), oligoelements (50 μL/rat), or oseltamivir (50 mg/kg) and oligoelements (50 μL/rat). The brain tissue extracted from the treated rats was used to determine the concentrations of adrenaline, noradrenaline, and dopamine, as well as the levels of GSH, lipid peroxidation, and ATPase activity. An increase in the concentration of adrenaline and noradrenaline and in the level of GSH in the group treated with oligoelements (p < 0.001) was observed, while the group treated with oseltamivir and oligoelements, the levels of dopamine increased (p < 0.001), and in the groups treated with oligoelements alone or combination with oseltamivir a decrease in lipid peroxidation was observed (p < 0.001). The results of this study suggest that the consumption of oseltamivir and oligoelements induce biphasic changes in the metabolism of catecholamines; thereby, inducing a protective mechanism against oxidative damage in the brains of young rats.

Comparison of serum amyloid A protein and C-reactive protein levels as inflammatory markers in periodontitis

Carlos Martín Ardila,Isabel Cristina Guzmán 대한치주과학회 2015 Journal of Periodontal & Implant Science Vol.45 No.1

Purpose: The purpose of this study was to compare serum amyloid A (SAA) protein levelswith high-sensitive C-reactive protein (hs-CRP) levels as markers of systemic inflammationin patients with chronic periodontitis. The association of serum titers of antibodies to periodontalmicrobiota and SAA/hs-CRP levels in periodontitis patients was also studied. Methods: A total of 110 individuals were included in this study. Patients were assessed forlevels of hs-CRP and SAA. Nonfasting blood samples were collected from participants atthe time of clinical examination. The diagnosis of adipose tissue disorders was made accordingto previously defined criteria. To determine SAA levels, a sandwich enzyme-linkedimmunosorbent assay was utilized. Paper points were transferred to a sterile tube to obtaina pool of samples for polymerase chain reaction processing and the identification of Porphyromonasgingivalis, Aggregatibacter actinomycetemcomitans, and Tannerella forsythia. The serum level of IgG1 and IgG2 antibodies to P. gingivalis, A. actinomycetemcomitans,and T. forsythia was also determined. Results: SAA and hs-CRP levels were higher in periodontitis patients than in controls(P<0.05). In bivariate analysis, high levels of hs-CRP (>3 mg/L) and SAA (>10 mg/L) weresignificantly associated with chronic periodontitis (P=0.004). The Spearman correlationanalysis between acute-phase proteins showed that SAA positively correlated with hs-CRP(r=0.218, P=0.02). In the adjusted model, chronic periodontitis was associated with highlevels of SAA (odds ratio [OR], 5.5; 95% confidence interval [CI], 1.6–18.2; P=0.005) andelevated hs-CRP levels (OR, 6.1, 95% CI, 1.6–23.6; P=0.008). Increased levels of serum IgG2antibodies to P. gingivalis were associated with high levels of SAA (OR, 3.6; 95% CI, 1.4–8.5;P=0.005) and high concentrations of hs-CRP (OR, 4.3; 95% CI, 1.9–9.8; P<0.001). Conclusions: SAA and hs-CRP concentrations in patients with chronic periodontitis arecomparably elevated. High serum titers of antibodies to P. gingivalis and the presence ofperiodontal disease are independently related to high SAA and hs-CRP levels.

Association between immunoglobulin G1 against Tannerella forsythia and reduction in the loss of attachment tissue

Carlos Martín Ardila,Mariana Olarte-Sossa,Isabel Cristina Guzmán 대한치주과학회 2014 Journal of Periodontal & Implant Science Vol.44 No.6

Purpose: To evaluate whether the levels of immunoglobulin G (IgG) antibody to Tanerellaforsythia are associated with periodontal status. Methods: Patients with a diagnosis of chronic periodontitis were considered candidates forthe study; thus 80 chronic periodontitis patients and 28 healthy persons (control group)were invited to participate in this investigation. The presence of T. forsythia was detectedby polymerase chain reaction (PCR) analysis using primers designed to target the respective16S rRNA gene sequences. Peripheral blood was collected from each subject to identify theIgG1 and IgG2 serum antibodies against T. forsythia. All microbiological and immunologicallaboratory processes were completed blindly, without awareness of the clinical status ofthe study patients or of the periodontal sites tested. Results: The bivariate analysis showed that lower mean levels of clinical attachment level(CAL) and probing depth were found in the presence of the IgG1 antibody titers againstwhole-cell T. forsythia; however, only the difference in CAL was statistically significant. Inthe presence of the IgG2 antibody titers against whole-cell T. forsythia, the periodontal parametersevaluated were higher but they did not show statistical differences, except forplaque. The unadjusted linear regression model showed that the IgG1 antibody againstwhole-cell T. forsythia in periodontitis patients was associated with a lower mean CAL(β=–0.654; 95% confidence interval [CI], –1.27 to –0.28; P<0.05). This statistically significantassociation remained after adjusting for possible confounders (β=–0.655; 95% CI,–1.28 to –0.29; P<0.05). On the other hand, smoking was a statistically significant risk factorin the model (β=0.704; 95% CI, 0.24 to 1.38; P<0.05). Conclusions: Significantly lower mean levels of CAL were shown in the presence of theIgG1 antibody titers against whole-cell T. forsythia in periodontitis patients. Thus, the resultsof this study suggest that IgG1 antibody to T. forsythia may have been a protectivefactor from periodontitis in this sample.

The Fiesta of the Patios: Intangible Cultural Heritage and Tourism in Cordoba, Spain

Tomás López-Guzmán,Francisco Gonzalez Santa Cruz 국립민속박물관 2016 International Journal of Intangible Heritage Vol.11 No.-

The inscription of Intangible Cultural Heritage (ICH) by UNESCO has a broad reflection on the cultural and tourism industry, and it occasionally involves a significant economic development in the area that houses that heritage. In this paper we present a study of the Fiesta of the Patios (Festival of the Courtyards) in Cordoba, Spain, recognised as ICH by UNESCO, and its relationship to tourism development in the city. The methodology used in this research involved conducting a survey of tourists who attended the Festival in order to know their profile, knowledge thereof, their rating on it and degree of satisfaction. This research shows the significant economic impact of this ICH in the city, mostly related to cultural heritage and tourism. The study highlights the relationship between culture and tourism, the significant economic impact, the positive opinion of the tourists surveyed with the Fiesta of the Patios and the high level of satisfaction of the visitors.

Analysis of virulence traits of Staphylococcus aureus isolated from bovine mastitis in semi-intensive and family dairy farms

Jaquelina J. Guzmán-Rodríguez,Ma. Fabiola León-Galván,José E. Barboza-Corona,Mauricio Valencia-Posadas,Pedro D. Loeza-Lara,Mónica Sánchez-Ceja,Alejandra Ochoa-Zarzosa,Joel E. López-Meza,Abner J. Gutié 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.5

Background: Staphylococcus aureus is one of the main microorganisms that causes bovine mastitis, and its well-known virulence characteristics and interactions with the environment are used to aid the design of more efficient therapies. Objectives: To determine whether the virulence traits, such as antibiotic resistance and biofilm-forming and internalization abilities, of S. aureus isolated from bovine mastitis are related to dairy production system types. Methods: The study was performed in the Mexican states of Guanajuato and Michoacan. Semi-intensive dairy farms (SIDFs) and family dairy farms (FDFs) (454 and 363 cows, respectively) were included. The 194 milk samples from mastitis affected quarters were collected and 92 strains of S. aureus were isolated and identified by biochemical and molecular tests. Antibiotic resistance, biofilm and internalization assays were performed on 30 randomly selected isolated strains to determine virulence traits, and these strains were equally allocated to the 2 dairy production systems. Results: All 30 selected strains displayed a high degree of resistance (50%–91.7%) to the antibiotics tested, but no significant difference was found between SIDF and FDF isolates. S. aureus strains from SIDFs had an average biofilm forming capacity of up to 36% (18.9%–53.1%), while S. aureus strains from FDFs registered an average of up to 53% (31.5%–77.8%) (p > 0.05). Internalization assays revealed a higher frequency of internalization capacity for strains isolated from FDFs (33.3%) than for those isolated from SIDFs (6.7%) (p > 0.05). fnbpA gen was detected in 46.6% of FDF strains and 33.3% of SIDF strains, and this difference was significant (p < 0.05). Conclusions: Our findings show that the virulence traits of S. aureus isolates analyzed in this study, depend significantly on several factors, such as phenotype, genotype, and environmental conditions, which are significantly related to dairy production system type and daily management practices.

Natural Vibrations and Buckling of a Spatial Lattice Structure Using a Continuous Model Derived from an Energy Approach

A.M. Guzmán,M.B. Rosales,C.P. Filipich 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.2

Lattice structures composed by parallel members named chords (or legs for vertical configurations) and connected by diagonals are very common among steel constructions in Civil and Mechanical Engineering and in particular, in the telecommunications industry. In the present study, a continuous model of a typical spatial lattice structure is derived. The legs configure a triangular cross-section and the diagonals are arranged in a zig-zag pattern. The differential system is derived from the potential and kinematic energies of the discrete model as the sums of each component contribution. Then, after accepting that the number of diagonals is large enough, the sums are approximated in the limit with classical integrals. Thus, the discrete system is replaced with a continuous formulation. The natural vibration problem of a lattice mast with a zig-zag diagonal pattern is studied using the proposed model. Also, the axial load influence is also accounted for through the second-order effect allowing to solve the buckling problem. Static deflection problems are also addressed. The Hamilton principle application yields the governing differential system in terms of nine unknown displacements. Several examples are solved numerically and the results are compared with the outcomes of a finite element spacial model. It is shown that there is an excellent agreement. The proposed continuous model can represent adequately the spatial lattice with a strong reduction in the degrees of freedom and the time of computation of the solution in comparison with a finite element approach.