Article
SBA-15 pore-width decrease via a one- or a two-step covalent bonding of a Fischer tungsten carbene as measured by N2 sorption
Fecha
2014Autor
Ortiz, G.G.
Pacheco-Moises, F.P.
Macias-Islas, M.T.
Flores-Alvarado, L.J.
Mireles-Ramirez, M.A.
Gonzalez-Renovato, E.D.
Hernandez-Navarro, V.E.
Sanchez-Lopez, A.L.
Alatorre-Jimenez, M.A.
Institución
Resumen
Multiple sclerosis (MS) is an autoimmune disease of the central nervous system associated with demyelination and axonal loss eventually leading to neurodegeneration. MS exhibits many of the hallmarks of an inflammatory autoimmune disorder including breakdown of the blood-brain barrier (BBB). The BBB is a complex organization of cerebral endothelial cells, pericytes and their basal lamina, which are surrounded and supported by astrocytes and perivascular macrophages. In pathological conditions, lymphocytes activated in the periphery infiltrate the central nervous system to trigger a local immune response that ultimately damages myelin and axons. Cytotoxic factors including pro-inflammatory cytokines, proteases, and reactive oxygen and nitrogen species accumulate and may contribute to myelin destruction. Dysregulation of the BBB and transendothelial migration of activated leukocytes are among the earliest cerebrovascular abnormalities seen in MS brains and parallel the release of inflammatory cytokines. In this review we establish the importance of the role of the BBB in MS. Improvements in our understanding of molecular mechanism of BBB functioning in physiological and pathological conditions could lead to improvement in the quality of life of MS patients. " 2015 IMSS.",,,,,,"10.1016/j.arcmed.2014.11.013",,,"http://hdl.handle.net/20.500.12104/44332","http://www.scopus.com/inward/record.url?eid=2-s2.0-84924813906&partnerID=40&md5=66fa0e94db6736385def9edc370a26b4 http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=prem&AN=25431839",,,,,,"8",,"Archives of Medical Research",,"687 697",,"45",,"Scopus MEDLINE WOS",,,,,,"Blood-brain barrier; Central nervous system; Multiple sclerosis; Oxidative stress",,,,,,"Role of the Blood-Brain Barrier in Multiple Sclerosis",,"Review"
"46091","123456789/35008",,"Méndez-Acosta, H.O., Depto. Ciencias Tecnológicas, CUCI, Universidad de Guadalajara, Ocotlán-Jalisco, Mexico, Depto. Ingeniería Química, CUCEI, Universidad de Guadalajara, Guadalajara-Jalisco, Mexico; Palacios-Ruiz, B., Depto. Ingeniería Química, CUCEI, Universidad de Guadalajara, Guadalajara-Jalisco, Mexico; Alcaraz-González, V., Depto. Ingeniería Química, CUCEI, Universidad de Guadalajara, Guadalajara-Jalisco, Mexico",,"Mendez-Acosta, H.O. Palacios-Ruiz, B. Alcaraz-Gonzalez, V.",,"2006",,"This paper deals with the robust regulation of volatile fatty acids (VFA) in an anaerobic digester. The digester is used for the treatment of industrial wine distillery wastewater. The robust approach is composed by an input-output linearizing feedback control and a Luenberger observer used to achieve the VFA regulation in spite of modelling errors (uncertain kinetics), actuator restrictions and load perturbations due to uncertain changes in the influent composition. The robust stability of the control approach is evaluated via numerical simulations under different operation conditions.",,,,,,,,,"http://hdl.handle.net/20.500.12104/44312","http://www.scopus.com/inward/record.url?eid=2-s2.0-80051592678&partnerID=40&md5=8130c6ce141c93d3aafafeaa3bdbf826",,,,,,"PART 1",,"IFAC Proceedings Volumes (IFAC-PapersOnline)",,"256 261",,"5",,"Scopus",,,,,,"Anaerobic digestion; Robust nonlinear control; Volatile fatty acids",,,,,,"Robust regulation of volatile fatty acids in an anaerobic digester",,"Conference Paper"
"46083","123456789/35008",,,,,,"2002",,,,,,,,"10.1021/es022254l",,"0013-936X","http://hdl.handle.net/20.500.12104/44304","http://dx.doi.org/10.1021/es022254l",,,,"American Chemical Society",,"7",,"Environmental science & technology",,"125A 127A",,"36",,"ChemAbsS",,,,,,,,,,,,"Government Watch: Low-level perchlorate exposures",,"Journal Article"
"46132","123456789/35008",,"Castillo, A., Laboratorio de Microbiología Sanitaria, Departamento de Farmacobiología, Universidad de Guadalajara, Guadalajara, Jalisco 44430, Mexico, Department of Animal Science, Texas A and M University, College Station, TX 77843, United States; Villarruel-López, A., Laboratorio de Microbiología Sanitaria, Departamento de Farmacobiología, Universidad de Guadalajara, Guadalajara, Jalisco 44430, Mexico; Navarro-Hidalgo, V., Laboratorio de Microbiología Sanitaria, Departamento de Farmacobiología, Universidad de Guadalajara, Guadalajara, Jalisco 44430, Mexico; Martínez-González, N.E., Laboratorio de Microbiología Sanitaria, Departamento de Farmacobiología, Universidad de Guadalajara, Guadalajara, Jalisco 44430, Mexico; Torres-Vitela, M.R., Laboratorio de Microbiología Sanitaria, Departamento de Farmacobiología, Universidad de Guadalajara, Guadalajara, Jalisco 44430, Mexico",,"Castillo, A. Villarruel-Lopez, A. Navarro-Hidalgo, V. Martinez-Gonzalez, N.E. Torres-Vitela, M.R.",,"2006",,"A survey of the presence of Salmonella and Shigella in freshly squeezed orange juice and related samples was conducted in Guadalajara, Mexico. One hundred samples of freshly squeezed orange juice were collected from 49 street booths and 51 small food service establishments. In addition, 75 fresh orange samples, each consisting of five orange units, and 75 wiping cloths were collected from the same establishments from which juice had been collected. Salmonella was isolated from 14, 20, and 23% of samples of orange juice, orange surfaces, and wiping cloths collected from street vendors, while Shigella was isolated from 6, 17, and 5% of these samples. In general, the frequency of isolation of these pathogens in samples from juice serving establishments at public markets was significantly lower than that found among street vendors (P < 0.05). Salmonella enterica serotypes Agona, Typhimurium, and Anatum were found in orange juice, fresh oranges, and wiping cloth samples, while serotype Mexico was found on fresh oranges and in wiping cloths and serotypes Muenchen and Panama were found only in wiping cloth samples. Regarding Shigella species, Shigella sonnei was found in all three types of sample tested; Shigella dysenteriae was found in juice and orange samples, Shigella boydii in orange and wiping cloth samples, and Shigella flexneri on oranges only. Thirty-one percent and 39% of the juice samples showed aerobic plate counts of ?5.0 log CFU/ml and Escherichia coli counts of >3.0 log CFU/ml, respectively. These high counts may indicate poor sanitation and potential exposure to fecal contamination either in the raw materials or during the orange-crushing and juice-serving process. These data may be useful for a further risk assessment of Salmonella or Shigella in unpasteurized, freshly squeezed juice. Copyright , International Association for Food Protection.",,,,,,,,,"http://hdl.handle.net/20.500.12104/44353","http://www.scopus.com/inward/record.url?eid=2-s2.0-33751242493&partnerID=40&md5=ff443661063b1f6f4057b129fb341a79 http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=med5&AN=17133801",,,,,,"11",,"Journal of Food Protection",,"2595 2599",,"69",,"Scopus MEDLINE WOS",,,,"Index Medicus;Beverages/mi [Microbiology];Citrus sinensis/mi [Microbiology];Colony Count, Microbial;Consumer Product Safety;Equipment Contamination;Feces/mi [Microbiology];Food Contamination/an [Analysis];Food Microbiology;Humans;Hygiene;Incidence;Mexico;Salmonella/ip [Isolation & Purification];Shigella/ip [Isolation & Purification]",,,,,,,,"Salmonella and Shigella in freshly squeezed orange juice, fresh oranges, and wiping cloths collected from public markets and street booths in Guadalajara, Mexico: Incidence and comparison of analytical routes",,"Review"
"46140","123456789/35008",,"Ojeda, M.L., Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, México D.F. 09340, Mexico, Instituto de Investigaciones en Materiales, UNAM, Circuito Exterior, Ciudad Universitaria, C.P. 04510, México, D.F., Mexico; Velásquez, C., Departamento de Ciencias Naturales y Exactas, Universidad de Guadalajara, Centro Universitario de los Voiles, C.P. 46600, Ameca, Jalisco, Mexico; Campero, A., Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, México D.F. 09340, Mexico; López-Cortés, J.G., Instituto de Química UNAM, Circuito Exterior, Ciudad Universitaria, C.P. 04510, Mexico, D.F., Mexico; Álvarez, C., Instituto de Química UNAM, Circuito Exterior, Ciudad Universitaria, C.P. 04510, Mexico, D.F., Mexico; Esparza, J.M., Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, México D.F. 09340, Mexico; Rojas, F., Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, México D.F. 09340, Mexico",,"Ojeda, M.L. Velasquez, C. Campero, A. Lopez-Cortes, J.G. Alvarez, C. Esparza, J.M. Rojas, F.",,"2008",,"The chemical attachment of Fischer tungsten carbene molecules around the cylindrical walls of SBA-15 causes a pore-width diminution with respect to the diameters of the voids existing in the pristine substrate. The attachment is made via a bridging unit of aminopropyltriethoxysilane (APTES) that, at its ethoxysilane end, anchors on the SBA-15 surface while, at its amino end, reacts with the tungsten carbene. The attachment can either be made in a single stage by adding the whole molecule, i.e. bridging + carbene units, or stepwise, i.e. the bridging unit is firstly attached to the silica surface and afterward the carbene group is linked to the amine end of the previous species. A remarkable result is that a uniform pore-width decrease of 0.30 nm is achieved when the ethoxysilane bridging units are anchored on the SiO2 surface; this decrease being independent of the pore size. An additional decrease of 0.37 nm is observed when the tungsten carbene is fixed to the amine end of the bridging molecule; the total pore-width decrease is thus 0.67 nm. In turn, the one-stage insertion of the whole carbene molecules causes a uniform pore-width decrease of 0.78 nm. The central cores of the functionalized pore entities remain free for the molecular transport of species that are taking place in catalytic, separation, and controlled release processes. The chemical anchoring of molecules on the surface of SBA-15 pores can be tailor sized and occlude the existing micropores, thus representing important and fundamental industrial applications. Copyright " 2008 John Wiley & Sons, Ltd.