Alberto Mendoza - Academia.edu (original) (raw)

Papers by Alberto Mendoza

Research paper thumbnail of La psiquiatría comunitaria en Cuba

Revista Cubana De Medicina Militar, Mar 1, 2014

Research paper thumbnail of DETERMINACIÓN DE Escherichia coli O157 A PARTIR DE PRODUCTOS CARNICOS Y LACTEOS ARTESANALES EMPLEANDO DOS SISTEMAS DE AISLAMIENTO

Universitas Scientiarum, 2001

Research paper thumbnail of Sistema de acciones para fortalecer la responsabilidad en el Centro Provincial de Información de Ciencias Médicas de Camagüey

Revista Cubana De Informacion En Ciencias De La Salud, Dec 24, 2012

Research paper thumbnail of Bioética: una mirada hacia la enfermería

Rev Cuba Enferm, Aug 1, 1999

Page 1. 85 Rev Cubana Enfermer 1999;15(2):85-9 Instituto Superior de Ciencias Médicas. Departamen... more Page 1. 85 Rev Cubana Enfermer 1999;15(2):85-9 Instituto Superior de Ciencias Médicas. Departamento de Enfermería Camagüey BIOÉTICA. UNA MIRADA HACIA LA ENFERMERÍA Lic. Moraima Wilson Donet,1 Lic. Daisbet Leiva Ortiz,2 Lic. Alberto Bujardón Mendoza,3 Lic. ...

Research paper thumbnail of Trastorno border de la personalidad, comorbilidad con trastornos del humor (episodio maníaco con síntomas psicóticos) y tratamiento con diferentes antipsicóticos de nueva generación: a propósito de un caso

Arch Venez Psiquiatr Neurol, Dec 1, 1998

Research paper thumbnail of Eficacia, tolerabilidad y seguridad de mirtazapina en pacientes con depresión mayor moderada y severa

Arch Venez Psiquiatr Neurol, Jun 1, 2002

... Id: 353864. Autor: Mendoza, Alberto; Ortega, Manuel; Flores, Julio; Borges, Héctor Luis; Garc... more ... Id: 353864. Autor: Mendoza, Alberto; Ortega, Manuel; Flores, Julio; Borges, Héctor Luis; García, Jackeline; Martínez, Danilo; Márquez, Gerardo; Lacobelli, Mirta; Pavón, Lisandro. ... BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde.

Research paper thumbnail of Meteorological Patterns During High Ozone Concentration Episodes In Mexicali And Monterrey, Mexico

Research paper thumbnail of Modeling Of Windblown Dust Events In The Nogales Border Region

Research paper thumbnail of Assessment of Residual Hydrocarbon Saturation with the Combined Quantitative Interpretation of Resistivity and Nuclear Logs

Research paper thumbnail of Role of GOGAT in carbon and nitrogen partitioning in Rhizobium etli

Microbiology, Jul 1, 2000

The isolation and characterization of a Rhizobium etli glutamate auxotroph, TAD12, harbouring a s... more The isolation and characterization of a Rhizobium etli glutamate auxotroph, TAD12, harbouring a single Tn5 insertion, is reported. This mutant produced no detectable glutamate synthase (GOGAT) activity. The cloning and physical characterization of a 72 kb fragment of R. etli DNA harbouring the structural genes gltB and gltD encoding the two GOGAT subunits GltB and GltD is also reported. In comparison with the wild-type strain (CFN42), the GOGAT mutant strain utilized less succinate and glutamate and grew less with this and other amino acids as nitrogen source. R. etli assimilates ammonium by the glutamine synthetase (GS)-GOGAT pathway and a GOGAT mutant prevents the cycling of glutamine by this pathway, something that impairs nitrogen and carbon metabolism and explains the decrease in the amino-nitrogen during exponential growth, with glutamate as nitrogen source. GOGAT activity also has a role in ammonium turnover and in the synthesis of amino acids and proteins, processes that are necessary to sustain cell viability in non-growing conditions. The assimilation of ammonium is important during symbiosis and glutamate constitutes 20-40 % of the total amino-nitrogen. In symbiosis, the blockage of ammonium assimilation by a GOGAT mutation significantly decreases the amino-nitrogen pool of the bacteroids and may explain why more N 2 is fixed in ammonium, excreted to the plant cell, transported to the leaves and stored in the seeds.

Research paper thumbnail of Chemical Characterization and Preliminary Source Contribution of Fine Particulate Matter in the Mexicali/Imperial Valley Border Area

J Air Waste Manage Assoc, 2010

The airshed shared by the Valley of Mexicali in Mexico and Imperial Valley in the United States f... more The airshed shared by the Valley of Mexicali in Mexico and Imperial Valley in the United States frequently experiences high levels of particulate matter (PM) less than 10 microm (PM10). However, very little information exists on the concentration and composition of fine PM (PM < 2.5 microm, or PM2.5) in the region, particularly on the Mexican side of the border. This paper presents the results of two monitoring campaigns (November 23-December 17, 2004 and April 12-22, 2005) that were conducted to obtain, for the first time, detailed composition of PM2.5 in the city of Mexicali. In both campaigns, 24-hr average PM2.5 samples were collected using low-volume equipment. Samples collected on Teflon filters were analyzed for mass and 38 metals (Na to Pb), whereas samples collected on quartz filters were analyzed for anions (sodium, potassium, ammonium), cations (chloride, nitrate, sulfate), and carbon (organic [OC] and elemental [EC]). During the fall campaign, the monitored concentration exceeded 65 microg/m3 (i.e., Mexico's PM2.5 air quality standard for 24-hr average samples) on four different days at one or more Mexicali sites. No exceedances were reported during the spring campaign. The contribution of main chemical species to the total mass indicated that organic material was the principal component (62% in fall and 56% in spring). Average secondary OC contributions to the total observed OC for the fall data was estimated at 14% (no day exceeding 30% contribution) and 47% for the spring data (with the minimum being 33% and the maximum 68%). Ammonium sulfate contributions exceeded ammonium nitrate contributions during the spring (16% vs. 7%), whereas the reverse occurred during the fall (5% vs. 10%). Geological material contributed 6% of the mass in the fall versus 10% in the spring. Overall the results indicate that PM2.5 in Mexicali is heavily influenced by anthropogenic sources, rather than from soil resuspension. Spatial and meteorological analysis of the data gives an indication that during the fall campaign local sources were the principal contributor to high-PM events, whereas during the spring campaign regional sources from southern California could have also contributed to the observed PM2.5 levels.

Research paper thumbnail of Rapid Simulation Of Borehole Nuclear Measurements With Approximate Spatial Flux-Scattering Functions

... This technique not only provided important information for tool design and improved post-proc... more ... This technique not only provided important information for tool design and improved post-processing of measured single-detector responses, but it opened the door to fast nuclear log simulation with the use of linear sensitivity functions. In addition, Aristodemou et al. ...

Research paper thumbnail of Field Examples of the Combined Petrophysical Inversion of Gamma-ray, Density, and Resistivity Logs acquired in Thinly-bedded Clastic Rock Formations

Research paper thumbnail of Emissions of Light-Duty Vehicles with Respect to Cruising Speed under Real-World Driving Conditions

Journal of Environmental Engineering, Jan 13, 2015

ABSTRACT Mobile-source emission inventories in countries such as Mexico still require empirical d... more ABSTRACT Mobile-source emission inventories in countries such as Mexico still require empirical data to complement modeling tools because these tools are based on few local observations. In this study, emission factors (EFs) were determined for 10 light-duty gasoline-powered vehicles as a function of cruising speed under real-world driving conditions typical of the Monterrey metropolitan area, the third largest urban center in Mexico. Greater variability in the EF was found when the vehicles were operated at lower speeds, specifically at 10 km/h ; however, above 40 km/h , the changes were marginal. Engine size was the factor that most influenced the emissions of CO 2 , which were significantly greater in vehicles with an engine size above 2 L. A reduction trend in the CO-to-NO x ratio of newer model vehicles was observed. Upon comparison of the experimental results with the results obtained from the MOBILE6.2-Mexico and the MOVES 2010a models, it was determined that the latter model better described the values of the EFs, the emission profile as a function of speed, and the CO-to-NO x ratio of the tailpipe gases. Read More: http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EE.1943-7870.0000935

Research paper thumbnail of Aplicación De Un Modelo De Calidad Del Aire De Segunda Generación a La Zona Metropolitana De Guadalajara, México

Revista Internacional De Contaminacion Ambiental Vol 25 No 2 73 85, Sep 13, 2011

... Alberto MENDOZA 1 y Marisa R. GARCÍA 2. ... La ZMG se encuentra en la cuenca del Valle del Rí... more ... Alberto MENDOZA 1 y Marisa R. GARCÍA 2. ... La ZMG se encuentra en la cuenca del Valle del Río Grande de Santiago, en los valles de Atemajac y la Planicie de Tonalá, entre las zonas montañosas de la Sierra Madre Occidental y el Eje Neovolcánico. ...

Research paper thumbnail of Issues Related to Air Quality and Health in the California-Baja California Border Region

A rapidly increasing population living in a diverse and dynamic region, stark differences in air ... more A rapidly increasing population living in a diverse and dynamic region, stark differences in air quality, economic disparity, lack of harmonized data, insufficient resources or technology, and different perspectives on the quality of the environment-these are just a few of the challenges found in the California-Baja California border region. This chapter discusses a number of these challenges and proposes recommendations and solutions.

Research paper thumbnail of Monte Carlo Modeling of Nuclear Measurements in Vertical and Horizontal Wells in the Presence of Mud- Filtrate Invasion and Salt Mixing

Petrophysics, 2007

This paper describes a study undertaken to quantify the influence of mud-filtrate invasion on neu... more This paper describes a study undertaken to quantify the influence of mud-filtrate invasion on neutron compensated and density measurements acquired in vertical and horizontal wells. Our objective is to assess the influence of non-axial symmetric spatial distributions of fluid saturation on generic nuclear tools. The case of horizontal wells is of primary interest due to the complex spatial distribution of fluids around the borehole due to mud-filtrate invasion combined with fluid density contrasts, permeability anisotropy, fluid mobility, and gravity segregation, among other factors.

Research paper thumbnail of Investigation of High Particulate Matter Episodes in the Nogales Border Region

Nogales, Arizona, has one of the worst air qualities in Arizona, frequently exceeding national st... more Nogales, Arizona, has one of the worst air qualities in Arizona, frequently exceeding national standards for PM 10 (particulate matter-PM) with aerodynamic diameter smaller than 10 μm) and presenting high concentrations for PM 2.5 (PM with aerodynamic diameter smaller than 2.5 μm). The present study investigated trace metal concentrations in particulate matter during high pollution episodes in the winter [2005][2006]. Aerosol samples were collected during a complementary intensive field study funded by the Arizona Department of Environmental Quality (AQEQ) that focussed on identification of particulate matter sources using electron microscopy and organic tracer compounds.

Research paper thumbnail of Structure and genetics of the partially duplicated gene RP located immediately upstream of the complement C4A and the C4B genes in the HLA class III region. Molecular cloning, exon-intron structure, composite retroposon, and breakpoint of gene duplication

The Journal of Biological Chemistry, Mar 18, 1994

disorders (15, 16). A pair of new genes with tenascin-like sequences, XA and XB, have been discov... more disorders (15, 16). A pair of new genes with tenascin-like sequences, XA and XB, have been discovered overlapping the CYP2lA and the CYP2lB genes, respectively (17, 18).

Research paper thumbnail of Joint Inversion Of Density And Resistivity Logs For The Improved Petrophysical Assessment Of Thinly-Bedded Clastic Rock Formations

Copyright 2007, held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and ... more Copyright 2007, held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors. This paper was prepared for presentation at the SPWLA 48th Annual Logging Symposium held in Austin, Texas, United States, June 3-6, 2007.

Research paper thumbnail of La psiquiatría comunitaria en Cuba

Revista Cubana De Medicina Militar, Mar 1, 2014

Research paper thumbnail of DETERMINACIÓN DE Escherichia coli O157 A PARTIR DE PRODUCTOS CARNICOS Y LACTEOS ARTESANALES EMPLEANDO DOS SISTEMAS DE AISLAMIENTO

Universitas Scientiarum, 2001

Research paper thumbnail of Sistema de acciones para fortalecer la responsabilidad en el Centro Provincial de Información de Ciencias Médicas de Camagüey

Revista Cubana De Informacion En Ciencias De La Salud, Dec 24, 2012

Research paper thumbnail of Bioética: una mirada hacia la enfermería

Rev Cuba Enferm, Aug 1, 1999

Page 1. 85 Rev Cubana Enfermer 1999;15(2):85-9 Instituto Superior de Ciencias Médicas. Departamen... more Page 1. 85 Rev Cubana Enfermer 1999;15(2):85-9 Instituto Superior de Ciencias Médicas. Departamento de Enfermería Camagüey BIOÉTICA. UNA MIRADA HACIA LA ENFERMERÍA Lic. Moraima Wilson Donet,1 Lic. Daisbet Leiva Ortiz,2 Lic. Alberto Bujardón Mendoza,3 Lic. ...

Research paper thumbnail of Trastorno border de la personalidad, comorbilidad con trastornos del humor (episodio maníaco con síntomas psicóticos) y tratamiento con diferentes antipsicóticos de nueva generación: a propósito de un caso

Arch Venez Psiquiatr Neurol, Dec 1, 1998

Research paper thumbnail of Eficacia, tolerabilidad y seguridad de mirtazapina en pacientes con depresión mayor moderada y severa

Arch Venez Psiquiatr Neurol, Jun 1, 2002

... Id: 353864. Autor: Mendoza, Alberto; Ortega, Manuel; Flores, Julio; Borges, Héctor Luis; Garc... more ... Id: 353864. Autor: Mendoza, Alberto; Ortega, Manuel; Flores, Julio; Borges, Héctor Luis; García, Jackeline; Martínez, Danilo; Márquez, Gerardo; Lacobelli, Mirta; Pavón, Lisandro. ... BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde.

Research paper thumbnail of Meteorological Patterns During High Ozone Concentration Episodes In Mexicali And Monterrey, Mexico

Research paper thumbnail of Modeling Of Windblown Dust Events In The Nogales Border Region

Research paper thumbnail of Assessment of Residual Hydrocarbon Saturation with the Combined Quantitative Interpretation of Resistivity and Nuclear Logs

Research paper thumbnail of Role of GOGAT in carbon and nitrogen partitioning in Rhizobium etli

Microbiology, Jul 1, 2000

The isolation and characterization of a Rhizobium etli glutamate auxotroph, TAD12, harbouring a s... more The isolation and characterization of a Rhizobium etli glutamate auxotroph, TAD12, harbouring a single Tn5 insertion, is reported. This mutant produced no detectable glutamate synthase (GOGAT) activity. The cloning and physical characterization of a 72 kb fragment of R. etli DNA harbouring the structural genes gltB and gltD encoding the two GOGAT subunits GltB and GltD is also reported. In comparison with the wild-type strain (CFN42), the GOGAT mutant strain utilized less succinate and glutamate and grew less with this and other amino acids as nitrogen source. R. etli assimilates ammonium by the glutamine synthetase (GS)-GOGAT pathway and a GOGAT mutant prevents the cycling of glutamine by this pathway, something that impairs nitrogen and carbon metabolism and explains the decrease in the amino-nitrogen during exponential growth, with glutamate as nitrogen source. GOGAT activity also has a role in ammonium turnover and in the synthesis of amino acids and proteins, processes that are necessary to sustain cell viability in non-growing conditions. The assimilation of ammonium is important during symbiosis and glutamate constitutes 20-40 % of the total amino-nitrogen. In symbiosis, the blockage of ammonium assimilation by a GOGAT mutation significantly decreases the amino-nitrogen pool of the bacteroids and may explain why more N 2 is fixed in ammonium, excreted to the plant cell, transported to the leaves and stored in the seeds.

Research paper thumbnail of Chemical Characterization and Preliminary Source Contribution of Fine Particulate Matter in the Mexicali/Imperial Valley Border Area

J Air Waste Manage Assoc, 2010

The airshed shared by the Valley of Mexicali in Mexico and Imperial Valley in the United States f... more The airshed shared by the Valley of Mexicali in Mexico and Imperial Valley in the United States frequently experiences high levels of particulate matter (PM) less than 10 microm (PM10). However, very little information exists on the concentration and composition of fine PM (PM < 2.5 microm, or PM2.5) in the region, particularly on the Mexican side of the border. This paper presents the results of two monitoring campaigns (November 23-December 17, 2004 and April 12-22, 2005) that were conducted to obtain, for the first time, detailed composition of PM2.5 in the city of Mexicali. In both campaigns, 24-hr average PM2.5 samples were collected using low-volume equipment. Samples collected on Teflon filters were analyzed for mass and 38 metals (Na to Pb), whereas samples collected on quartz filters were analyzed for anions (sodium, potassium, ammonium), cations (chloride, nitrate, sulfate), and carbon (organic [OC] and elemental [EC]). During the fall campaign, the monitored concentration exceeded 65 microg/m3 (i.e., Mexico's PM2.5 air quality standard for 24-hr average samples) on four different days at one or more Mexicali sites. No exceedances were reported during the spring campaign. The contribution of main chemical species to the total mass indicated that organic material was the principal component (62% in fall and 56% in spring). Average secondary OC contributions to the total observed OC for the fall data was estimated at 14% (no day exceeding 30% contribution) and 47% for the spring data (with the minimum being 33% and the maximum 68%). Ammonium sulfate contributions exceeded ammonium nitrate contributions during the spring (16% vs. 7%), whereas the reverse occurred during the fall (5% vs. 10%). Geological material contributed 6% of the mass in the fall versus 10% in the spring. Overall the results indicate that PM2.5 in Mexicali is heavily influenced by anthropogenic sources, rather than from soil resuspension. Spatial and meteorological analysis of the data gives an indication that during the fall campaign local sources were the principal contributor to high-PM events, whereas during the spring campaign regional sources from southern California could have also contributed to the observed PM2.5 levels.

Research paper thumbnail of Rapid Simulation Of Borehole Nuclear Measurements With Approximate Spatial Flux-Scattering Functions

... This technique not only provided important information for tool design and improved post-proc... more ... This technique not only provided important information for tool design and improved post-processing of measured single-detector responses, but it opened the door to fast nuclear log simulation with the use of linear sensitivity functions. In addition, Aristodemou et al. ...

Research paper thumbnail of Field Examples of the Combined Petrophysical Inversion of Gamma-ray, Density, and Resistivity Logs acquired in Thinly-bedded Clastic Rock Formations

Research paper thumbnail of Emissions of Light-Duty Vehicles with Respect to Cruising Speed under Real-World Driving Conditions

Journal of Environmental Engineering, Jan 13, 2015

ABSTRACT Mobile-source emission inventories in countries such as Mexico still require empirical d... more ABSTRACT Mobile-source emission inventories in countries such as Mexico still require empirical data to complement modeling tools because these tools are based on few local observations. In this study, emission factors (EFs) were determined for 10 light-duty gasoline-powered vehicles as a function of cruising speed under real-world driving conditions typical of the Monterrey metropolitan area, the third largest urban center in Mexico. Greater variability in the EF was found when the vehicles were operated at lower speeds, specifically at 10 km/h ; however, above 40 km/h , the changes were marginal. Engine size was the factor that most influenced the emissions of CO 2 , which were significantly greater in vehicles with an engine size above 2 L. A reduction trend in the CO-to-NO x ratio of newer model vehicles was observed. Upon comparison of the experimental results with the results obtained from the MOBILE6.2-Mexico and the MOVES 2010a models, it was determined that the latter model better described the values of the EFs, the emission profile as a function of speed, and the CO-to-NO x ratio of the tailpipe gases. Read More: http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EE.1943-7870.0000935

Research paper thumbnail of Aplicación De Un Modelo De Calidad Del Aire De Segunda Generación a La Zona Metropolitana De Guadalajara, México

Revista Internacional De Contaminacion Ambiental Vol 25 No 2 73 85, Sep 13, 2011

... Alberto MENDOZA 1 y Marisa R. GARCÍA 2. ... La ZMG se encuentra en la cuenca del Valle del Rí... more ... Alberto MENDOZA 1 y Marisa R. GARCÍA 2. ... La ZMG se encuentra en la cuenca del Valle del Río Grande de Santiago, en los valles de Atemajac y la Planicie de Tonalá, entre las zonas montañosas de la Sierra Madre Occidental y el Eje Neovolcánico. ...

Research paper thumbnail of Issues Related to Air Quality and Health in the California-Baja California Border Region

A rapidly increasing population living in a diverse and dynamic region, stark differences in air ... more A rapidly increasing population living in a diverse and dynamic region, stark differences in air quality, economic disparity, lack of harmonized data, insufficient resources or technology, and different perspectives on the quality of the environment-these are just a few of the challenges found in the California-Baja California border region. This chapter discusses a number of these challenges and proposes recommendations and solutions.

Research paper thumbnail of Monte Carlo Modeling of Nuclear Measurements in Vertical and Horizontal Wells in the Presence of Mud- Filtrate Invasion and Salt Mixing

Petrophysics, 2007

This paper describes a study undertaken to quantify the influence of mud-filtrate invasion on neu... more This paper describes a study undertaken to quantify the influence of mud-filtrate invasion on neutron compensated and density measurements acquired in vertical and horizontal wells. Our objective is to assess the influence of non-axial symmetric spatial distributions of fluid saturation on generic nuclear tools. The case of horizontal wells is of primary interest due to the complex spatial distribution of fluids around the borehole due to mud-filtrate invasion combined with fluid density contrasts, permeability anisotropy, fluid mobility, and gravity segregation, among other factors.

Research paper thumbnail of Investigation of High Particulate Matter Episodes in the Nogales Border Region

Nogales, Arizona, has one of the worst air qualities in Arizona, frequently exceeding national st... more Nogales, Arizona, has one of the worst air qualities in Arizona, frequently exceeding national standards for PM 10 (particulate matter-PM) with aerodynamic diameter smaller than 10 μm) and presenting high concentrations for PM 2.5 (PM with aerodynamic diameter smaller than 2.5 μm). The present study investigated trace metal concentrations in particulate matter during high pollution episodes in the winter [2005][2006]. Aerosol samples were collected during a complementary intensive field study funded by the Arizona Department of Environmental Quality (AQEQ) that focussed on identification of particulate matter sources using electron microscopy and organic tracer compounds.

Research paper thumbnail of Structure and genetics of the partially duplicated gene RP located immediately upstream of the complement C4A and the C4B genes in the HLA class III region. Molecular cloning, exon-intron structure, composite retroposon, and breakpoint of gene duplication

The Journal of Biological Chemistry, Mar 18, 1994

disorders (15, 16). A pair of new genes with tenascin-like sequences, XA and XB, have been discov... more disorders (15, 16). A pair of new genes with tenascin-like sequences, XA and XB, have been discovered overlapping the CYP2lA and the CYP2lB genes, respectively (17, 18).

Research paper thumbnail of Joint Inversion Of Density And Resistivity Logs For The Improved Petrophysical Assessment Of Thinly-Bedded Clastic Rock Formations

Copyright 2007, held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and ... more Copyright 2007, held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors. This paper was prepared for presentation at the SPWLA 48th Annual Logging Symposium held in Austin, Texas, United States, June 3-6, 2007.