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Search Results: 1 - 10 of 216032 matches for " González-Guzmán "
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NORRRM: A Free Software to Calculate the CIPW Norm  [PDF]
Reneé González-Guzmán
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.61004
Abstract: This work gives an introduction to the R package NORRRM whose main purpose is to calculate the CIPW Norm. Although there are many softwares and spreadsheets available to estimate the standard mineral assemblages in igneous rocks, this package has the following advantages: a) it has the ability to be run on any operating computer systems (BSD, GNU/Linux, Mac OS X®, Windows®); b) an input argument allows choose different procedures to set the Fe-oxidation ratio; c) the options to use whole-rock major as well as minor oxides and trace elements in the computation; d) the output data yields highly consistent results achieving absolute match between the sum of the input weights of oxides recalculated on an anhydrous basis and the sum of the weights of estimated normative minerals and; e) the functions are written in R language and released under terms that guarantee users the freedom to study, adapt, modify, and distribute the software.
An Integrated PCR Colony Hybridization Approach to Screen cDNA Libraries for Full-Length Coding Sequences
Jacob Pollier, Miguel González-Guzmán, Wilson Ardiles-Diaz, Danny Geelen, Alain Goossens
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0024978
Abstract: Background cDNA-Amplified Fragment Length Polymorphism (cDNA-AFLP) is a commonly used technique for genome-wide expression analysis that does not require prior sequence knowledge. Typically, quantitative expression data and sequence information are obtained for a large number of differentially expressed gene tags. However, most of the gene tags do not correspond to full-length (FL) coding sequences, which is a prerequisite for subsequent functional analysis. Methodology A medium-throughput screening strategy, based on integration of polymerase chain reaction (PCR) and colony hybridization, was developed that allows in parallel screening of a cDNA library for FL clones corresponding to incomplete cDNAs. The method was applied to screen for the FL open reading frames of a selection of 163 cDNA-AFLP tags from three different medicinal plants, leading to the identification of 109 (67%) FL clones. Furthermore, the protocol allows for the use of multiple probes in a single hybridization event, thus significantly increasing the throughput when screening for rare transcripts. Conclusions The presented strategy offers an efficient method for the conversion of incomplete expressed sequence tags (ESTs), such as cDNA-AFLP tags, to FL-coding sequences.
La inequidad por clase, etnia y género expresada en el desmedro
González-Guzmán,Rafael; García-García,Juan José; Tinoco-Marquina,Aline;
Revista Gerencia y Políticas de Salud , 2010,
Abstract: objective: to ascertain the impact of inequality by social class, ethnicity and gender on growth in stature and the prevalence of stunting. material and methods: a retrospective cohort study was constructed with information from the national health and nutrition survey, 2006, comparing the average height and the prevalence of stunting, according to indicators of social class, gender and ethnicity. results: statistically significant differences were found in stature and stunting, according to socioeconomic status, literacy, schooling, ethnicity, the birth cohort and gender. these differences become larger in more recent birth cohorts. conclusions: data from survey show inequalities in the prevalence of stunting that has been accentuated over the years, these inequalities express of social inequalities by ethnicity, class and gender.
Estudio petrográfico y geoquímico del Complejo Plutónico El Pe?uelo (Cinturón de Intrusivos de Concepción del Oro), noreste de México
Velasco-Tapia, Fernando;González-Guzmán, Reneé;Chávez-Cabello, Gabriel;Lozano-Serna, Javier;Valencia-Moreno, Martín;
Boletín de la Sociedad Geológica Mexicana , 2011,
Abstract: this work presents the petrographic and geochemical data for the el pe?uelo plutonic complex (eppc), which is an intrusive that belongs to concepción del oro intrusive belt (coib; northeastern mexico). the eppc is a semi-circular structure, constituted by three emplacement centers, situated in the eastern part of the coib and the northern extension of the taxco-san miguel de allende fault system. however, the complex was not affected by the activity of this fault system. the eppc is constituted by intrusive rocks varying from quartz monzodiorite to quartz syenite, the latter covering most of the complex surface. the eppc was emplaced in upper cretaceous marine sedimentary rocks. the quartz syenite is cut by quartz monzodioritic and porphyritic meso-syenitic dykes. also, this unit contains irregularly distributed monzodioritic microgranular enclaves. additionally, pegmatitic dykes cut the rest of the lithologic units. the eppc mineralogical assemblage shows variable quantities of plagioclase + alkaline feldspar + quartz ± amphibole + biotite ± orthopyroxene + clinopyroxene + fe-ti oxides. intrusive rocks have a chemical composition of sio2 = 45.7-72.0 %, mg# = 39.2-60.2, and n-fe = 0.54-0.73. they show chondrite-normalized ree patterns enriched in light elements [(la/yb)n = 6-11] with no eu anomalies. primitive mantle-normalized multi-element diagrams show lile enriched patterns relative to the hfse. their trace-element geochemistry is comparable to high-ba-sr granitoids: (a) high ba concentration (= 594-2302 ppm) and sr (= 444-2192 ppm); (b) low concentrations of y (= 10-46 ppm) and nb (= 6-17 ppm); and (c) high values for sr/y (= 25-85) and (la/yb = 8.9-16.5) ratios. the origin of eppc has been related to partial melting of an enriched lithospheric mantle, in a post-orogenic setting, followed by fractional crystallization coupled to crustal assimilation.
Secuencia parcial de un fragmento de ADN de patos silvestres homologo al Complejo Mayor de
González-Guzmán Sofía,Loza-Rubio, Elizabeth,León-Régagnon, Virginia,García-Espinosa, Gary
REDVET , 2009,
Abstract: ResumenLa variación individual de la respuesta inmune esta ligada a ladiversidad funcional y estructural del MHC (por sus siglas en inglesMajor Histocompatibility Complex), TcR (Receptores de células T),inmunoglobulinas (anticuerpos), citoquininas, TNF (por sus siglas eningles Tumor Necrosis Factor), entre otras proteínas. Estas proteínasestán codificadas por múltiples y polimórficos genes, la variabilidad de estos genes constituyen las principales bases, en las variaciones de la resistencia a determinada enfermedad o enfermedades. Estascaracterísticas se han documentado en la gallina doméstica, pero no enel pato. En el presente trabajo se amplifico por PCR un fragmento denucleótidos de ADN genómico de pato doméstico que compartió un100% de similitud con un fragmento del MHC clase II de pollo, quecorrespondió a una secuencia similar a DAB1 (Disabled 1).La secuencia DAB1 también fue amplificada en nueve especies de patos silvestres del género Anas que posterior a un análisis por el polimorfismo del largo de los fragmentos de restricción (PLFR) con las enzimas RsaI, BsrI y HindIII, se observó que la especie Anas americana,Anas platyrhynchos diazi y Anas platyrhynchos domesticus fueronsutilmente diferentes a la especie Anas discors, Anas crecca, Anascyanoptera, Anas acuta, Anas streptera y Anas clypeata. Hasta dondesabemos, este es el primer reporte que indica la presencia desecuencias similares a DAB1 en patos silvestres. Este estudio podríaayudar a entender porque los patos podrían ser menos susceptibles apresentar neoplasias que en las gallinas.SummaryThe individual response of the immune system is linked to the functional and structural diversity of the MHC (Major Histocompatibility Complex), TcR (T cell receptor), inmunoglobulines (antibodies), citokines, TNF (Tumor Necrosis Factor), among other proteins. These proteins are coded for multiple and polymorphic genes, the variability of these genes constitutes the main bases, in the variations of the resistance to certain diseases. These characteristics have been documented in the domestic hen, but not in the duck. In these article we have developed for PCR a fragment of nucleotides of DNA genomic of domestic duck that shared 100% of similarity with a fragment of the MHC class II of chicken that itcorresponded to a similar sequence to DAB1 (Disabled 1). The sequenceDAB1 was also amplified for nine species of waterfowl species of thegender Anas and then we analyze the polymorphic use the technique ofrestriction fragments (PLFR) with the enzymes RsaI, BsrI and HindIII.We observed that the American species
Detección de orthomyxovirus H7N3 en anátidos del Estado de México (Detection of orthomyxovirus H7N3 in waterfowl from the State of Mexico)
Cuevas-Domínguez, Edgar A,González-Guzmán, Sofía,Quintana-López, José A,Loza-Rubio, Elizabeth
REDVET , 2009,
Abstract: ResumenDurante octubre 2005 a marzo 2006 se muestrearon 231 individuos de7 especies diferentes, mediante hisopos cloacales y faríngeos. Elobjetivo fue la detección en condiciones naturales de orthomyxovirus en las ciénegas de Lerma y durante la estancia de los patos silvestres en el Estado de México. Durante el mes de Febrero se logro la detección de un orthomyxovirus H7N3 de baja patogenicidad. Siendo para México el primer reporte oficial de aislamiento viral de forma natural en un Anas Cyanoptera en los humedales de México.SummaryFrom October 2005 to March 2006 a total of 231 individuals from sevendifferent species were sampled using cloacal and pharyngeal swabs. Theobjective was to detect under natural conditions the presence oforthomyxovirus in the wetlands of Lerma and during the presence ofwild ducks in the State of Mexico. During the month of Februarydetection of low pathogenicity orthomyxovirus H7N3 was achieved,which was the first official report of viral isolation from Anas cyanoptera in wetlands in Mexico.
Reversible Immobilization of Chelating Affinity Surfactants on Reversed Phase Adsorbents for Protein and Peptide Separations under Metal Affinity Chromatography  [PDF]
Omar González-Ortega, Roberto Guzmán
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.514101
Abstract: Alkyl-bound silica was modified using chelating surfactants and the resulting adsorbent was used in immobilized metal affinity chromatography of proteins and peptides. Brij-76, a non-ionic amphiphilic surfactant with an alkyl moiety and an ethylene oxide chain, was reversible adsorbed to alkyl silica (C18). The hydroxyl group at the end of the ethylene oxide chain was chemically modified previously with an iminodiacetate functionality as chelating agent of transitional metal ions. Cu(II) was studied as immobilized ion for the adsorption of peptides and proteins. Three chromatographic supports were prepared having different Cu(II) capacities. For a low Cu(II) capacity case, the generated adsorbent behaved as a controlled access media preventing the adsorption of large molecular weight proteins, such as BSA, while small peptides, such as Angiotensin III, or amino acids could be retained. For a medium and high Cu(II) capacity, the synthesized adsorbent no longer behaved as a controlling access media and all molecules in this study, either large or small, were retained by the immobilized ion. Nonetheless, most of the BSA was strongly retained by the system and a pH change did not remove any of the adsorbed BSA while the small molecules were removed by the same pH change.
Rock, identidad e interculturalidad
González Guzmán, Daniel
Iconos : Revista de Ciencias Sociales , 2004,
Anaerobic Biotransformation of Nitro-Compounds to Amines by Bovine Rumen Fluid  [PDF]
Alfonso Rodríguez, Ignacio Irazoqui, Guzmán álvarez, Cecilia Cajarville, José Luis Repetto, Mercedes González, Hugo Cerecetto
Green and Sustainable Chemistry (GSC) , 2011, DOI: 10.4236/gsc.2011.13009
Abstract: Microorganims of the bovine rumen fluid biocatalyzed the reduction of nitro-compound substrates to yield the respective amines. This enzymatic process, using ruminal contents, has rarely been reported in associa- tion with the bioreduction of nitro groups. The biotransformation reactions catalyzed by this system were de- pendent of both the electronic characteristics and the area/volume of the nitro-substrates confirming the processes are enzymatic. The semi-preparative scale biotransformation went by in good yield showing the rumen fluid may be employed in the synthesis of amines under very mild conditions and, moreover, it may have application in the bioremediation of nitro-compounds.
Environmental Deterioration of the Tecomate Coastal Lagoon, in the Guerrero State, Mexico  [PDF]
Salvador Villerías-Salinas, Juan Violante-González, Neftalí García-Castro, Lorena Alonzo-Guzmán
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.71001
Abstract: An exhaustive field study was undertaken between November 2011 and August 2012, with the aim to know the causes of the environmental deterioration of the Tecomate Lagoon, in the Guerrero state, Mexico. Data of temperature, dissolved oxygen, salinity parameters and depth of the lagoon were interpolated using the Kriging geostatistical method to generate a prediction surface. The lagoon registered a great variation in its saline concentration, which ranged from 8.0 to 65.0 ppt, with the lowest values in November 2011 and the highest at May 2012. The great variability in the salinity throughout the year contributed in significant form to the lagoon’s instability. An average water temperature of 32?C and dissolved oxygen levels of 4.49 to 7.44 mg/L were recorded. The low depth registered in the lagoon (mean = 1 m), is related to fluvial and marine processes, both of which modify depth through the transport of sediment to its interior. Currently, fishing is scarce, with the mangrove forest in some areas in a process of deterioration due to a lack of moisture. The lagoon system is undergoing a process of environmental deterioration, with an advanced ecological succession and non-aquatic vegetable species colonizing the area surrounding the lagoon.
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