Sergio Granados - Academia.edu (original) (raw)

Papers by Sergio Granados

Physical Chemistry Chemical Physics

DLVO analysis shows that the solid acid catalysts used for cellulose hydrolysis should maximize v... more DLVO analysis shows that the solid acid catalysts used for cellulose hydrolysis should maximize van der Waals attraction and minimize electrostatic repulsion. High temperature and high shear conditions can promote catalyst–cellulose interaction.

Anuario Filosófico

El artículo trata de analizar el fenómeno de la felicidad según Scheler en tres pasos. primero, c... more El artículo trata de analizar el fenómeno de la felicidad según Scheler en tres pasos. primero, como sentimiento espiritual en el marco de la clasificación de los estratos sentimentales, descubriéndose, sobre todo, como acto y no como estado. Segundo, se profundiza en ese carácter de acto, iluminándolo como fuente de sentido. Por último, la felicidad se propone como signo de la identidad esencial de la persona, y se aborda brevemente el sentimiento contrario, la desesperación.

We assess the suitability of potassium ferri-/ferrocyanide as an electroactive species for long-t... more We assess the suitability of potassium ferri-/ferrocyanide as an electroactive species for long-term utilization in aqueous organic redox flow batteries. A series of electrochemical and chemical characterization experiments was performed to distinguish between structural decomposition and apparent capacity fade of ferri-/ferrocyanide solutions used in the capacity-limiting side of a flow battery. Our results indicate that, in contrast with previous reports, no structural decomposition of ferri-/ferrocyanide occurs at tested pH values as high as 14 in the dark or in diffuse indoor light. Instead, an apparent capacity fade takes place due to an electroless reduction of ferricyanide to ferrocyanide, via electroless oxygen evolution reaction. We find that this parasitic process can be further exacerbated by carbon electrodes, with apparent capacity fade rates at pH 14 increasing with an increased ratio of carbon electrode surface area to total amount of ferricyanide in solution. Based o...

Jatropha gossypifolia L. (Euphorbiaceae) is a plant widely used in the treatment of type 2 diabet... more Jatropha gossypifolia L. (Euphorbiaceae) is a plant widely used in the treatment of type 2 diabetes mellitus (T2DM), but there are few scientific reports validating its activity in this area. In this work and through a bioguided assay, a crude extract stimulated glucose uptake in C2C12 myotubes up to 30%, thereby reducing insulin resistance induced by fatty acids compared to the basal control. A chromatographic fraction applied intraperitoneally (IP) in mice reduced glucose by 42% in a mouse model of T2DM, after administration of 10 doses during 20 days. A flavanone was purified from this active fraction and its structure was assigned by 1 Hand 13 C-NMR (1D and 2D) and MS. This compound retains the previously reported activity, stimulating in vitro the glucose uptake in a concentration-dependent manner. This study indicates that Jatropha gossypifolia L. extracts enhance glucose uptake in cultured myotubes and adipocytes and also improving glucose tolerance in an in vivo model.

Revista Española de Filosofía Medieval, 2002

Ya los discfpulos inmediatos de Aristoteles parecen no estar de acuerdo en su concepcion del voiJ... more Ya los discfpulos inmediatos de Aristoteles parecen no estar de acuerdo en su concepcion del voiJc; 1t011]'ttK6c;. Asf, Teofrasto 1 dice-de un modo que no deja lugar a dudas-que Aristoteles consideraba el vouc; 1t011]'ttK6c; como al~o perteneciente ala esencia del hombre 2 • Pero, contrariamente a ello, se hace referenda a la Etica de Eudemo, donde este filosofo, del que se dice que ha seguido con toda fidelidad el camino de su maestro 3 , parece sefialar aDios como el entendirniento agente 4 • Si esto fuera cierto, entonces los grandes discfpulos de Aristoteles, que recibieron la doctrina inmediatamente del maestro rnismo, estarfan enfrentados entre ellos en lo que constituye el mayor abismo y que hoy dfa diVide min las interpretaciones. Asf pues, deberfamos, ciertamente, renunciar tambien a la esperanza de una futura explicacion segura. Pero esa tal contradiccion no existe. Veremos luego como los pasajes de Eudemo y de Teofrasto pueden llegar a una perfecta armonfa. 2. El fragmento que Ternistio nos ha conservado dellibro V de la Ffsica de Teofrasto, en el segundo de su doctrina del alma, permite reconocer ya en una consideracion superficial tres puntos: 1) segun la concepcion de Teofrasto, Aristoteles tenfa por inmaterial no solo el entendirniento agente, sino tambien el paciente, que se hace todo lo inteligible 5 ; 2) el consideraba a ambos como capacidades de uno y el mismo sujeto 6 ; * «Uberblick der frtiheren Erkliirungsversuche>>, contenido como secci6n r• (p. 5-36) en Die Psychologie des Aristoteles, insbesondere seine Lehre von NOY~ ITOIHfiKO~ (<<La Psicologfa de Arist6teles, en especial su doc

Bulletin of the American Physical Society, 2019

Bulletin of the American Physical Society, 2017

Bulletin of the American Physical Society, 2018

Anuario Filosófico, 2008

In this article, the biological and spiritual dimensions of the human being according to Max Sche... more In this article, the biological and spiritual dimensions of the human being according to Max Scheler are described. The duality which appears is not between the physical and the animate, but rather between the vital and the spiritual. These two dimensions are, according to Scheler, essentially distinct; nevertheless, in his philosophy, they are shown to be mutually dependent in an original manner.

European Journal of Applied Physiology, 2021

PURPOSE We carried out a randomized, clinical trial in adults of both sexes with metabolic syndro... more PURPOSE We carried out a randomized, clinical trial in adults of both sexes with metabolic syndrome (MS) to assess the efficacy of high-intensity, low-volume interval training (HIIT) compared to moderate-intensity continuous training (MICT) on insulin resistance (IR), muscle mass, muscle activation, and serum musclin. METHODS Fasting glycemia, insulinemia, and glycated haemoglobin were determined by conventional methods, IR by Homeostatic model assessment (HOMA), lean mass by Dual-Energy X-ray Absorptiometry, muscle activation through carnosine by Proton Magnetic Resonance Spectroscopy, and musclin by Enzyme-Linked ImmunoSorbent Assay before and after a supervised, three-times/week, 12-week treadmill programme. HIIT (n = 29) consisted of six intervals with one-minute, high-intensity phases at 90% of peak oxygen consumption (VO2peak). MICT (n = 31) trained at 60% of VO2peak for 30 min. RESULTS Patients had a mean age of 50.8 ± 6.0 years, body mass index of 30.6 ± 4.0 kg/m2, and VO2peak of 29.0 ± 6.3 mL.kg-1.min-1. Compared to MICT, HIIT was not superior at reducing Ln HOMA-IR (adjusted mean difference: 0.083 [95%CI - 0.092 to 0.257]), carnosine or musclin or at increasing thigh lean mass. HIIT increased carnosine by 0.66 mmol/kg.ww (95% CI 0.08-1.24) after intervention. Both interventions reduced IR, body fat percentage and increased total lean mass/height2 and VO2peak. Musclin showed a non-significant reduction with a small effect size after both interventions. CONCLUSION Compared to MICT, HIIT is not superior at reducing IR, carnosine or musclin or at increasing skeletal muscle mass in adults with MS. Both training types improved IR, muscle mass and body composition. NCT03087721, March 22nd, 2017. TRIAL REGISTRATION NUMBER NCT03087721. Registered March 22nd, 2017.

Endocrinology and Metabolism, 2021

Background: We studied whether musclin function in humans is related to glycemic control, body co... more Background: We studied whether musclin function in humans is related to glycemic control, body composition, and cardiorespiratory capacity.Methods: A cross-sectional study was performed in sedentary adults with or without metabolic syndrome (MS). Serum musclin was measured by enzyme-linked immunosorbent assay. Insulin resistance (IR) was evaluated by the homeostatic model assessment (HOMA-IR). Body composition was determined by dual-energy X-ray absorptiometry and muscle composition by measuring carnosine in the thigh, a surrogate of fiber types, through proton magnetic resonance spectroscopy. Cardiorespiratory capacity was assessed through direct ergospirometry.Results: The control (n=29) and MS (n=61) groups were comparable in age (51.5±6.5 years old vs. 50.7±6.1 years old), sex (72.4% vs. 70.5% women), total lean mass (58.5%±7.4% vs. 57.3%±6.8%), and peak oxygen consumption (VOpeak) (31.0±5.8 mL O2./kg.min vs. 29.2±6.3 mL O2/kg.min). Individuals with MS had higher body mass index...

Sustainable Energy & Fuels, 2021

Nickel (Ni)-impregnated metal oxide catalysts, Ni/CeZrOx, Ni/ZrO2, and Ni/CeO2, were investigated... more Nickel (Ni)-impregnated metal oxide catalysts, Ni/CeZrOx, Ni/ZrO2, and Ni/CeO2, were investigated to maximize energy recovery and reduce char yield during catalytic hydrothermal liquefaction (CHTL) of food waste.

Energy and Buildings, 2021

Abstract Building energy consumption constitutes approximately 40% of total energy usage in the U... more Abstract Building energy consumption constitutes approximately 40% of total energy usage in the US. zero energy buildings (ZEBs) have received much attention in the last decade as they can alleviate some of the negative impacts that buildings have on the environment. New materials and systems are emerging that can help regulate building enclosure heat losses and gains in a passive manner, possibly leading to more cost effective ZEBs. A novel thermo-optically responsive solid-solid phase change material (SS-PCM) coating has been developed to help offset heat gains or losses in building enclosures. The study investigates the optical and thermal processes of the SS-PCM, as well as the synergies among different layers within the enclosure system, through a series of numerical simulations. The impacts of the solar incoming angle and phase transition temperature on the absorptivity of the SS-PCM, which have a significant influence on the optical and thermal transfer processes, are explored. The feasibility and benefits of using the SS-PCM system in building enclosures under both warm and cold climates are investigated. Simulation results: (1) confirm the potential of the SS-PCM coatings to reduce undesirable heat exchange through building enclosure in all orientations and identify the roof as the preferred location of installing the SS-PCM system; (2) substantiate the thermal benefits of the system throughout the year and determine the optimal phase transition temperature of the SS-PCM with maximal energy saving; and (3) demonstrate more thermal benefits and energy saving of the SS-PCM coatings in warm climates compared to cold climates, which has been a challenge for most of existing passive solar facades.

Medicine & Science in Sports & Exercise, 2020

Emerging research demonstrates the link between physical activity and academic outcomes, however,... more Emerging research demonstrates the link between physical activity and academic outcomes, however, Limited evidence exists on whether different modes of physical activity (PA) result in differences in cognitive and academic outcomes in real world settings. PURPOSE: The purpose of this study was to evaluate the effects of embedding a high intensity interval training (HITT) and muscular strength program in physical education (PE) classes on academic and behavioral outcomes. METHODS: Seventy children (40 boys & 30 girls; age 8-10 yrs. old) enrolled in Accelerations Academy were assigned into one of three conditions during a one-week period: control (n = 23), High Intensity Interval Training (HITT) (n = 25), and muscular strength (MS) (n = 22). The HIIT condition consisted of 4 days of HITT sessions (9 min/session; 30 sec on:30 sec off) followed by X min of standard PE activities; the MS condition consisted of 4 days of strength sessions (3 sets/10-12 reps for 3 exercises/session) followed by ~30 min of standard PE activities; the control condition consisted of ~50 min of standard PE only. PA intensity and duration was measured using actigraph accelerometers (Actigraph, Pensacola, FL). Math Assessment scores and Connor Abbreviated Ratings were conducted at baseline and post-intervention to identify academic and behavioral changes respectively. Intervention effects for outcomes were examined using regression analysis. RESULTS: Participation in HITT predicted higher vigorous (β=2.21, p=0.005) and very vigorous minutes (β=0.80, p < 0.001), but not moderate minutes compared to control. Participation in strength was not statistically different. HIIT participation was also associated with greater improvement on math test scores (β=1.52, p=0.04). No condition was associated with significant changes to behavioral ratings. CONCLUSION: Preliminary evidence from this study highlights the potential for embedding an acute HITT program within PE for improving physical activity levels and academic outcomes in elementary school children. This is consistent with prior studies which show how short bouts of intense exercise can improve cognitive and mental health outcomes in adolescent populations.

Langmuir, 2020

To bridge the gap between the cleanliness of a freshly cleaved surface of 2D BiOI and that availa... more To bridge the gap between the cleanliness of a freshly cleaved surface of 2D BiOI and that available from a purely chemical-etching means, we subjected single-crystal BiOI to a series of surface treatments and quantified the resulting chemical states and electronic properties. Vapor transport syntheses included both physical vapor transport from singlesource BiOI, as well as chemical vapor transport from Bi 2 O 3 + BiI 3 and from Bi + I 2 + Bi 2 O 3. Surface treatments included tape cleaving, rinsing in water, sonication in acetone, an aqueous HF etch, and a sequential HF etch with subsequent sonication in acetone. X-ray diffraction, XRD, and X-ray photoelectron spectroscopy, XPS, probed the resulting bulk crystalline species and interfacial chemical states, respectively. In comparison with overlayer models of idealized oxide-terminated or iodide-terminated BiOI, angle-resolved XPS elucidated surface terminations as a function of each treatment. Ultraviolet photoelectron spectroscopy, UPS, established work-function, and Fermi-level energies for each treatment. Data reveal that HF etching yields interfacial BiI 3 at BiOI steps that is subsequently removed with acetone sonication. UPS establishes n-type behavior for the vapor-transport-synthesized BiOI, and surface work function and Fermi level shifts for each chemical treatment under study. We discuss the implications for processing BiOI nanofilms for energy-conversion applications.

Solar Energy, 2020

Many phase change materials (PCMs) experience a change in transparency when undergoing a phase tr... more Many phase change materials (PCMs) experience a change in transparency when undergoing a phase transition. These thermo-optically responsive materials can be used to generate passive temperature control systems for building enclosures. The integration of optical and thermal switches into smart temperature-controlling elements requires rationally designed PCMs featuring tunable optical and thermal properties. Two polymers, poly (Octadecyl methacrylate) (PSMA) and poly(2-(2-(octadecyloxy) ethoxy) ethyl methacrylate) (PE2SMA) were synthesized and evaluated for their potential use in passive thermal energy storage systems. UV-Visible Spectroscopy, Near Infra-Red Spectroscopy, and Differential Scanning Calorimetry were used to evaluate the effect that changes in the polymer chemical structure had on the optical and thermal properties of the resulting materials. Insertion of a 6-atom flexible spacer (diethylene glycol) between the pendant crystalline motif and the polymer backbone of PSMA resulted in increases of latent heat storage capacity from 62 J/g to 94 J/g and thermal conductivity from 0.218 W/mK to 0.318 W/mK. Notably, insertion of a flexible spacer also resulted in a melting transition temperature increase from 37.7°C for PSMA to 48°C for PE2SMA. The visible transmittance of the polymers increased from 0% to 90% upon transition from crystalline to amorphous state. This study presents a synthetic strategy to control thermal and optical properties of polymeric PCMs materials. The material properties and structure-property relationships derived from this study will enable the refinement of the models used to predict the performance of passive temperature-regulating systems. More accurate models will guide the development of the thermo-responsive polymeric materials required for better perfoming temperature-regulating building enclosures.