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Search Results: 1 - 10 of 466979 matches for " Fanny A. Cabrera-Rivera "
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Synthesis, Resolution and Absolute Configuration of 2,3-Dihydro-2-Tert-Butyl-3-N-Benzylquinazolin-4-One: A Possible Chiral Auxiliary for Synthesis of β-Amino Cyclohexancarboxylic Acid  [PDF]
Fanny A. Cabrera-Rivera, Jaime Escalante
International Journal of Organic Chemistry (IJOC) , 2014, DOI: 10.4236/ijoc.2014.41007
Abstract: 3-Benzyl-2-(tert-butyl)-2,3-dihydroquinazolin-4(1H)-one rac-11 was resolved via the preparation of diastereomers with N-phthalyl-L-alanine chloride and its absolute configuration was determined by X-ray crystallographic analysis. This heterocycle has potential as a substrate chiral in asymmetric induction due to the steric effects of its tert-butyl group.
Efficient Solvent-Free Preparation of Imines, and Their Subsequent Oxidation with m-CPBA to Afford Oxaziridines  [PDF]
Luis álvarez-Santamaría, Eusebio Juaristi, Alexa Berenice Arroyo-Colín, Jorge Palma-Flores, Fanny Araceli Cabrera-Rivera, Jaime Escalante
Green and Sustainable Chemistry (GSC) , 2019, DOI: 10.4236/gsc.2019.94011
Abstract: A simple one-pot procedure for the preparation of imines from the corresponding aldehydes and amines, and their subsequent oxidation reaction with m-CPBA to produce synthetically useful oxaziridines is reported. The method is applicable to imines derived from both aliphatic and aromatic aldehydes and diverse alkyl amines. Short reaction times, essentially quantitative yields, very mild reaction conditions, and easy purification are the main features of the procedure reported herein.
Solvent- and Catalyst-Free Microwave-Assisted Decarboxylation of Malonic Acid Derivatives  [PDF]
Fanny Araceli Cabrera-Rivera, Luis Gabriel Hernández-Vázquez, Patricia Flores-Sánchez, Maria Durán-Galván, Jaime Escalante
Green and Sustainable Chemistry (GSC) , 2017, DOI: 10.4236/gsc.2017.74021
Abstract: It has been found that microwave assisted decarboxylation of malonic acid derivatives can be achieved under solvent-free and catalyst free conditions. This new method produces the corresponding carboxylic acid in a pure manner and with a high yield in a very short reaction time: 3 - 10 min. In general terms, the condition under which this reaction is carried out accelerates the decarboxylation significantly of a series of disubstituted malonic acid derivatives, and makes this new process efficient, easy and environmentally friendly.
Dynamic Modeling and Current Mode Control of a Continuous Input Current Buck-Boost DC-DC Converter
J. C. Mayo-Maldonado,R. Salas-Cabrera,A. Barrios-Rivera,C. Turrubiates-Rivera
Lecture Notes in Engineering and Computer Science , 2011,
Colgajo de trapecio extendido en reconstrucción de defectos causados por resección de tumores de cabeza y cuello Extended trapezius fasciomyocutaneous flap for reconstruction after head and neck tumoral resection
A.A. Leal Salazar,E. Cabrera Sánchez,P. Rivera Díaz,J. Galache Collell
Cirugía Plástica Ibero-Latinoamericana , 2011,
Abstract: Los defectos originados por la resección de tumores en cabeza y cuello pueden ser de difícil resolución. Presentamos un caso clínico en el que se practicó reconstrucción usando el colgajo fasciomusculocutáneo de trapecio extendido basado en la arteria dorsal escapular. Este colgajo puede alcanzar el cuello, la órbita y el vértex del cráneo; por lo tanto, puede ser de utilidad para el tratamiento de grandes defectos en estas áreas. Head and neck defects caused by tumoral resection could be a difficult task for a plastic surgeon. We present a clinical case of reconstruction using an extended trapezius myocutaneous flap based on dorsal scapular artery, in the occipital region. This flap can reach the neck, the orbit and the vertex of the head so it may be useful for treating large defects in these areas.
Performance Comparison among Trained Judges and Panels for the Evaluation of “Cuajada” Type Fresh Cheese in Two Regions from Oaxaca in México  [PDF]
Lorena Guadalupe Ramón Canul, Emmanuel de Jesús Ramírez Rivera, Rodrigo Santiago Cabrera, Fátima Karina Delgado Vidal, José Manuel Juárez Barrientos, María Hernández Cervantes, Juliana López Velázquez, Tania Gómez Alvarado
Food and Nutrition Sciences (FNS) , 2011, DOI: 10.4236/fns.2011.210156
Abstract: Four “cuajada” type fresh cheeses were evaluated by two trained panels in different regions from Oaxaca in Mexico (Instituto Tecnológico de Comitancillo (ITC) and Universidad del Mar (UMAR)). Each panel was integrated by six judges. Analysis of variance (ANOVA) in conjunction with principal component analysis (PCA) and the Rv coefficient were used to identify similarities and consensus among trained judges and panels. The ANOVA results revealed that the judges from ITC performed significantly better (P < 0.05) in discrimination and repetitivity, while both panels showed a similar effect in discrimination. The PCA determined some similarities in the position of cheeses in the sensory space, while Rv revealed that judges and panels were consensual. In conclusion, statistical resources determined that both panels were discriminating and that similarities in the positioning of cheeses in the sensory space were found.
The bioactivity of plant extracts against representative bacterial pathogens of the lower respiratory tract
Virgilio Bocanegra-García, María del Rayo Camacho-Corona, Mónica Ramírez-Cabrera, Gildardo Rivera, Elvira Garza-González
BMC Research Notes , 2009, DOI: 10.1186/1756-0500-2-95
Abstract: thirty-five extracts prepared from nine plants used in Mexican traditional medicine for the treatment of respiratory infections were evaluated against 15 control bacterial species and clinical isolates.Both chloroformic (CLO) and methanolic (MET) extracts of Larrea tridentata were active against Methicillin-resistant S. aureus, B. subtilis and L. monocytogenes. A MET extract of L. tridentata was also active against S. aureus, S. pneumoniae, S. maltophilia, E. faecalis and H. influenzae and the CLO extract was active against A. baumannii. An Aqueous extract of M. acumitata and a MET extract of N. officinale were active against S. pneumoniae. CLO and MET extracts of L. tridentata were active against clinical isolates of S. aureus, S. pneumoniae and E. faecalis.Overall, our results support the potential use of L. tridentata as a source of antibacterial compounds.Lower respiratory tract infections are a major cause of illness and death and are common in intensive care units (ICU) [1,2]. The most frequent causal agents of these infections are Streptococcus pneumoniae, Klebsiella pneumoniae, Staphylococcus aureus, Haemophilus influenzae, Pseudomonas aeruginosa, Acinetobacter baumannii and Stenotrophomonas maltophilia. Some additional and less frequent causative agents are Escherichia coli, Enterobacter cloacae, Bacillus subtilis [3], Bacillus cereus [4], Listeria monocytogenes [5], and Enterococcus faecalis [6].Infections with these bacteria are associated with high morbidity and mortality, especially in immunocompromised patients [7-10]. Methicillin-resistant S. aureus (MRSA) is of particular concern in the United States since approximately 60% of all staphylococcal infections in the ICU are caused by MRSA [11,12]. Penicillin-resistant S. pneumoniae and vancomycin-resistant enterococci are an additional cause for concern in the clinical setting [13].In Mexico, some plants are used in traditional medicine to treat respiratory diseases or ailments such as cough, bronchitis
Colgajo de trapecio extendido en reconstrucción de defectos causados por resección de tumores de cabeza y cuello
Leal Salazar,A.A.; Cabrera Sánchez,E.; Rivera Díaz,P.; Galache Collell,J.; Rioja Torrejón,L.F.;
Cirugía Plástica Ibero-Latinoamericana , 2011, DOI: 10.4321/S0376-78922011000400010
Abstract: head and neck defects caused by tumoral resection could be a difficult task for a plastic surgeon. we present a clinical case of reconstruction using an extended trapezius myocutaneous flap based on dorsal scapular artery, in the occipital region. this flap can reach the neck, the orbit and the vertex of the head so it may be useful for treating large defects in these areas.
Excitations in the quantum paramagnetic phase of the quasi-one-dimensional Ising magnet CoNb$_2$O$_6$ in a transverse field: Geometric frustration and quantum renormalization effects
I. Cabrera,J. D. Thompson,R. Coldea,D. Prabhakaran,R. I. Bewley,T. Guidi,J. A. Rodriguez-Rivera,C. Stock
Physics , 2014, DOI: 10.1103/PhysRevB.90.014418
Abstract: The quasi-one-dimensional (1D) Ising ferromagnet CoNb$_2$O$_6$ has recently been driven via applied transverse magnetic fields through a continuous quantum phase transition from spontaneous magnetic order to a quantum paramagnet, and dramatic changes were observed in the spin dynamics, characteristic of weakly perturbed 1D Ising quantum criticality. We report here extensive single-crystal inelastic neutron scattering measurements of the magnetic excitations throughout the three-dimensional (3D) Brillouin zone in the quantum paramagnetic phase just above the critical field to characterize the effects of the finite interchain couplings. In this phase, we observe that excitations have a sharp, resolution-limited line shape at low energies and over most of the dispersion bandwidth, as expected for spin-flip quasiparticles. We map the full bandwidth along the strongly dispersive chain direction and resolve clear modulations of the dispersions in the plane normal to the chains, characteristic of frustrated interchain couplings in an antiferromagnetic isosceles triangular lattice. The dispersions can be well parametrized using a linear spin-wave model that includes interchain couplings and further neighbor exchanges. The observed dispersion bandwidth along the chain direction is smaller than that predicted by a linear spin-wave model using exchange values determined at zero field, and this effect is attributed to quantum renormalization of the dispersion beyond the spin-wave approximation in fields slightly above the critical field, where quantum fluctuations are still significant.
Violencias y exclusiones en el medio penitenciario. Enfoque socio-educativo y de la paz
Fanny T. Aa?os
Convergencia , 2012,
Abstract: Las violencias y las exclusiones son situaciones que van más allá de la agresión, el conflicto y la pobreza, donde se evidencian el estigma social y el distanciamiento de la norma y del grupo social mayoritario, en este caso la población reclusa espa ola. El artículo aborda los fundamentos básicos de la violencia, la exclusión, la pedagogía-educación social y la educación para la paz, estas dos últimas como referentes y/o respuestas a la problemática del medio penitenciario. Asimismo, se profundiza y estudia los rasgos, factores y contextos en torno a las mujeres y hombres internados/as, además de proponer métodos y pautas teóricas-prácticas de intervención en el colectivo.
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