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E. García-Hernández,C.G. Aguilar-Madera,E.C. Herrera-Hernández,R. Ocampo-Pérez,E. Bailón-García,Farid B. Cortés 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
In this work, a mathematical formulation based on fundamental principles of momentum and masstransport with a kinetic adsorption model at the liquid-solid interface is proposed. This formulation wasnumerically solved and used for the interpretation of adsorption rate data of phenol onto an activatedcarbon cloth in a stirred tank adsorber under different agitation rates. The mathematical model solutionwas compared with the obtained by mathematical models that neglect the local velocity andconcentration profiles in the solution; external mass transfer model (EMTM) and thefirst-order kineticmodel (FOM). The results showed that under all studied stirring speeds (30 200 rpm) the proposedmodel was able to capture the dynamics of the concentration decay curves, while EMTM and FOM modelswere only able to interpret the data at high stirring speeds, indicating that velocity profiles play animportant role during phenol adsorption. Particular “wake zones” were identified behind the mobileadsorbent, which importantly promotes the transport of solute toward the activated carbon cloth. As aresult, it was found that convective transport is much more important than diffusive transport in thesolution.
Verónica García-Villamar,Laura G. Hernández-Aragón,Jesús R. Chávez-Ríos,Arturo Ortega,Margarita Martínez-Gómez,Francisco Castelán 대한배뇨장애요실금학회 2018 International Neurourology Journal Vol.22 No.S2
Purpose: To evaluate the expression of glial cell line-derived neurotrophic factor (GDNF) and its receptor, GDNF family receptor alpha subunit 1 (GFRα-1) in the pelvic (middle third) vagina and, particularly, in the paravaginal ganglia of nulliparous and primiparous rabbits. Methods: Chinchilla-breed female rabbits were used. Primiparas were killed on postpartum day 3 and nulliparas upon reaching a similar age. The vaginal tracts were processed for histological analyses or frozen for Western blot assays. We measured the ganglionic area, the Abercrombie-corrected number of paravaginal neurons, the cross-sectional area of the neuronal somata, and the number of satellite glial cells (SGCs) per neuron. The relative expression of both GDNF and GFRα-1 were assessed by Western blotting, and the immunostaining was semiquantitated. Unpaired two-tailed Student t -test or Wilcoxon test was used to identify statistically significant differences (P≤0.05) between the groups. Results: Our findings demonstrated that the ganglionic area, neuronal soma size, Abercrombie-corrected number of neurons, and number of SGCs per neuron were similar in nulliparas and primiparas. The relative expression of both GDNF and GFRα- 1 was similar. Immunostaining for both GDNF and GFRα-1 was observed in several vaginal layers, and no differences were detected regarding GDNF and GFRα-1 immunostaining between the 2 groups. In the paravaginal ganglia, the expression of GDNF was increased in neurons, while that of GFRα-1 was augmented in the SGCs of primiparous rabbits. Conclusions: The present findings suggest an ongoing regenerative process related to the recovery of neuronal soma size in the paravaginal ganglia, in which GDNF and GFRα-1 could be involved in cross-talk between neurons and SGCs.
L. R. Jacobo,R. García‑Hernández,V. H. López‑Morelos,A. Contreras 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
The effect of acicular ferrite (AF) and bainite (B) obtained by heat treatment (HT) applied to an API X70 steel on corrosionresistance and stress corrosion cracking (SCC) susceptibility was evaluated through polarization curves and slow strain ratetests respectively, in NS4 solution and congenital water (CW). The HT was carried out at 1050 °C for 15 and 30 min followedby water quenching. Change of ferrite–perlite to AF and B was observed as result of heat treatment applied to X70steel. Effect of HT time in terms of microstructure obtained was analysed. The mechanical properties obtained by the HTare higher than X100 steel. HT-30 min improve the corrosion resistance of X70 steel exposed to both solutions, which arerelated to coarse and homogeneous microstructure of AF and B. Localized corrosion was observed in the steel exposed toboth solutions. HT-15 min improve mechanical properties and higher content of fine AF, but decreases SCC resistance. Steel with higher content of fine AF microstructure is more susceptible to SCC. SCC indexes revealed that the heat-treatedsteel could be susceptible to SCC in CW confirmed by the secondary cracks observed. The SCC mechanism was hydrogenembrittlement. Meanwhile, steel HT by 15 min exposed to NS4 solution could be susceptible to SCC. Crack growth rate washigher in steel HT by 15 min, which are related to more fine and brittle AF microstructure.
Progression of Jackhammer Esophagus to Type III Achalasia and Improvement After Extended Myotomy
( Pablo Vázquez García ),( Constanza Ciriza De Los Ríos ),( Fernando Canga Rodríguez-valcárcel ),( Diego Hernández García-gallardo ) 대한소화기 기능성질환·운동학회 2020 Journal of Neurogastroenterology and Motility (JNM Vol.26 No.1
Heriberto Granados‑Becerra,Víctor H. López‑Morelos,Alberto Ruiz,Rafael García‑Hernández,Francisco F. Curiel‑López,Martin R. Barajas‑Alvarez 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
The Ramberg–Osgood equation was applied to model the stress–strain behavior of heat-treated and welded specimens ofInconel 600 up to 0.2 and 0.175 mm/mm of strain, respectively. As-received and aged plates of Inconel 600 were gas metalarc welded to simulate repair of a component in operation. Dog bone shape specimens were tensile tested at a cross headspeed of 0.005 s−1 and the deformation was measured with an extensometer with a gage length of 20 mm. Microstructuralobservations were made in the optical and scanning electron microscope. Fitting the experimental data in the plastic regionof stress–strain curves to a novel three slopes Ramberg–Osgood model enabled estimation of the hardening coefficient, n. The value of n varied from 0.07 to 0.3 depending on the metallurgical condition of the specimen. A notorious increase wasobserved in the value of n for samples heat-treated beyond 25 h and in as-welded samples. The results of this work showeda very good correlation between the model and the experimental curves.
In Vitro Effect of Methanolic Extract of Argemone mexicana against Trichomonas vaginalis
Joel Horacio Elizondo-Luevano,Julia Verde-Star,Azucena González-Horta,Rocío Castro-Ríos,Magda Elizabeth Hernández-García,Abelardo Chávez-Montes 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.2
Infections caused by Trichomonas vaginalis in humans are one of the main public health problems caused by sexually transmitted diseases. Objective of this study was to evaluate potential biological activity of the medicinal plant Argemone mexicana (Mexican poppy) on T. vaginalis. Methanolic extracts of the stems and leaves of A. mexicana, and different fractions were prepared with solvents of different polarities. The extracts and functional groups were detected containing sterols, triterpenes, quinones, flavonoids and, alkaloids. Extracts from both the stems and leaves of A. mexicana inhibited the growth of T. vaginalis with half-maximal inhibitory concentration value of 70.6 and 67.2 μg/ml, respectively. In the active fractions, the most abundant compounds were berberine and jatrorrhizine, with presumed antiparasitic activity.