Molecular sensing and discrimination by a luminescent terbium–phosphine oxide coordination material

Ibarra, Ilich A.,Hesterberg, Travis W.,Chang, Jong-San,Yoon, Ji Woong,Holliday, Bradley J.,Humphrey, Simon M. The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.64

<P>PCM-15 is a robust and recyclable sensor for the effective discrimination of a wide range of small molecules. Sensing is achieved by direct attenuation of the luminescence intensity of Tb(<SMALL>III</SMALL>) ions within the material. A competition study involving trace amounts of NH<SUB>3</SUB> in H<SUB>2</SUB> gas shows that PCM-15 can be used to quantitatively detect trace analytes.</P> <P>Graphic Abstract</P><P>PCM-15 is a robust and recyclable sensor for the effective discrimination of a wide range of small molecules. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc44575e'> </P>

Clockwork for neutrino masses and lepton flavor violation

Ibarra, Alejandro,Kushwaha, Ashwani,Vempati, Sudhir K. North-Holland Pub. Co 2018 Physics letters. Section B Vol.780 No.-

<P><B>Abstract</B></P> <P>We investigate the generation of small neutrino masses in a clockwork framework which includes Dirac mass terms as well as Majorana mass terms for the new fermions. We derive analytic formulas for the masses of the new particles and for their Yukawa couplings to the lepton doublets, in the scenario where the clockwork parameters are universal. When the universal Majorana mass vanishes, the zero mode of the clockwork sector forms a Dirac pair with the active neutrino, with a mass which is in agreement with oscillations experiments for a sufficiently large number of clockwork gears. On the other hand, when it does not vanish, neutrino masses are generated via the seesaw mechanism. In this case, and due to the fact that the effective Yukawa couplings of the higher modes can be sizable, neutrino masses can only be suppressed by postulating a large Majorana mass scale. Finally, we discuss the constraints on the mass scale of the clockwork fermions from the non-observation of the rare leptonic decay μ → e γ .</P>

Adsorption Properties of MFM-400 and MFM-401 with CO₂ and Hydrocarbons: Selectivity Derived from Directed Supramolecular Interactions

Ibarra, Ilich A.,Mace, Amber,Yang, Sihai,Sun, Junliang,Lee, Sukyung,Chang, Jong-San,Laaksonen, Aatto,Schrö,der, Martin,Zou, Xiaodong American Chemical Society 2016 Inorganic Chemistry Vol.55 No.15

<P>([Sc-2(OH)(2)(BPTC)]) (H4BPTC = biphenyl-3,3',5,5'-tetracarboxylit acid), MFM-400 (MFM = Manchester Framework Material; previously designated NOTT), and ([Sc(OH)-(TDA)]) (H(2)TDA = thiophene-2,5-dicarboxylic acid), MFM-401, both show xelective and, reversible capture of CO2. In particular, MFM-400 exhibits a reasonably high CO2 uptake at low pressures and competitive CO2/N-2 selectivity coupled to a moderate isosteric heat of adsorption (Q(st)) for CO2 (29.5 kJ mol(-1)) at zero coverage, thus affording a facile uptake release process. Grand canonical Monte Carlo (GCMC) and density functional theory (DFT) computational analyses of CO2 uptake in both materials confirmed preferential adsorption sites consistent with the higher CO2 uptake observed experimentally for MFM-400 over MFM-401 at low pressures. For MFM-400, the Sc-OH group participates in moderate interactions with CO2 (Q(st) = 33.5 kJ mol(-1)), and these are complemented by weak hydrogen-bonding interactions (O center dot center dot center dot H-C = 3.10-3.22 angstrom) from four surrounding aromatic -CH groups. In the case of MFM-401, adsorption is provided by cooperative interactions of CO2 with the Sc-OH group and one C-H group. The binding energies obtained by DFT analysis for the adsorption sites for both materials correlate well with the observed moderate isosteric heats of adsorption for CO2. GCMC simulations for both materials confirmed higher uptake of EtOH compared with nonpolar vapors of toluene and. cydohexane. This is in good Correlation with the experimental data, and DFT analysis confirmed the formation of a strong hydrogen bond between EtOH and the hydrogen atom of the hydroxyl group of the MFM-400 and MFM-401 framework (FIAT) with H-O-EtOH center dot center dot center dot H-O-FW distances of 1.77 arid 1.75 angstrom, respectively. In addition, the accessible regeneration of MFM-400 and MFM-401 and release of CO2 potentially provide minimal economic and environmental penalties.</P>

Potential for probing three-body decays of Long-Lived Particles with MATHUSLA

Ibarra, Alejandro,Molinaro, Emiliano,Vogl, Stefan Elsevier 2019 Physics letters: B Vol.789 No.-

<P><B>Abstract</B></P> <P>Several extensions of the Standard Model predict the existence of Long-Lived Neutral Particles (LLNPs) with masses in the multi-GeV range and decay lengths of O ( 100 m ) or longer. These particles could be copiously produced at the LHC, but the decay products cannot be detected with the ATLAS or CMS detectors. MATHUSLA is a proposed large-volume surface detector installed near ATLAS or CMS aimed to probe scenarios with LLNPs which offers good prospects for disentangling the physics underlying two-body decays into visible particles. In this work we focus on LLNP decays into three particles with one of them being invisible, which are relevant for scenarios with low scale supersymmetry breaking, feebly interacting dark matter or sterile neutrinos, among others. We analyze the MATHUSLA prospects to discriminate between two- and three-body LLNP decays, as well as the prospects for reconstructing the underlying model parameters.</P>

Catalytic cracking of raw bio-oil under FCC unit conditions over different zeolite-based catalysts

Alvaro Ibarra,Idoia Hita,Miren J. Azkoiti,Jose M. Arandes,Javier Bilbao 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-

The performance of different zeolite-based catalysts (HY, HZSM-5 and HBeta) on the catalytic cracking ofbio-oil has been explored, using a simulated riser reactor and resembling industrial FCC conditions. Theeffect of the C/O (catalyst/bio-oil) ratio and the zeolite types have been assessed. The level ofdeoxygenation is >61% (increasing with C/O ratio). Total hydrocarbon yield was higher for the HBetacatalyst (56 wt%), while the liquid hydrocarbons yields were relatively similar for all catalysts, obtaininghigher gasoline yields with the HY catalyst (46–55 wt%), and higher LPG yields with the HZSM-5 catalyst(12–14 wt%) due to its higher acidity. The HY zeolite produced more coke (4–7 wt%) given its capacity forretaining coke precursors within its micropores.

Importance of Extract Standardization and In Vitro/Ex Vivo Assay Selection for the Evaluation of Antioxidant Activity of Botanicals: A Case Study on Three Rosmarinus officinalis L. Extracts

Alvin Ibarra,Julien Cases,Antoine Bily,Kan He,Naisheng Bai,Marc Roller,Aure´lie Coussaert,Christophe Ripoll 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.5

The overproduction of free radicals and oxygen reactive species is suspected to be implicated in a wide range of metabolic reactions that can have pernicious consequences in the development of a variety of human diseases. Botanical extracts are sources of antioxidants that counteract both free radicals and oxygen reactive species. The processing conditions used in the botanical extraction may influence the antioxidant composition; therefore, different extracts from the same plant may have different antioxidant properties. To illustrate this fact, we conducted a study using three commercial rosemary (Rosmarinus officinalis L.) leaf extracts. The three extracts were standardized to contain, respectively, 20% carnosic acid, 40% ursolic acid, or 20% rosmarinic acid. They were evaluated for their total (hydrophilic+lipophilic) antioxidant effects on oxygen radical absorbance capacity (ORAC), their ferric reducing/antioxidant power (FRAP), and their capacity to inhibit Cu2+-induced low-density lipoprotein (LDL) oxidation ex vivo. The ursolic acid extract showed the lowest antioxidant capacity on all models. The rosmarinic acid extract had an antioxidant capacity 1.5 times higher on ORAC and four times higher on FRAP than the carnosic acid extract. However, the carnosic acid extract was better than the rosmarinic acid extract in inhibiting the oxidation of LDL ex vivo. These results encourage conducting further studies to evaluate the carnosic acid and rosmarinic acid extracts in vivo. Our study offers an example of the importance of the extraction procedures, on which depends the nature of the antioxidant composition, and highlights interest to proceed with in vitro/ex vivo assay selection for the evaluation of the antioxidant properties of botanical extracts.

Slide Session : OS-GAS-15 ; Gastroenterology : Blatchford Score and Blood Transfusion Correlation in Patients with Non Variceal Upper Gastrointestinal Bleeding (nVUGIB). A Teaching Hospital Experience

( Hector Raul Ibarra Sifuentes ),( Carlos Javier Rodriguez Alvarez ),( Erick Joel Rendon Ramirez ),( Perla Rocio Colunga Pedraza ),( Iris Jazmin Colunga Pedraza ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

Background: The Glasgow-Blatchford scale has been used to classify patients into low or high risk and the need for medical or endoscopic treatment Methods: A cross-sectional study, which retrospectively Blatchford scale is calculated for patients with nVUGIB, requiring blood transfusion, to determine the likelihood of blood transfusion, using Pearson correlation applying SPSS Statistics 18; in a period beginning from January 1, 2009 to December 31, 2013 Results: 42 patients with diagnosis of nVUGIB were studied, of which 26 patients (61.9%) required blood transfusion. By sex the highest percentage was 65% for men (17 men and 9 women). 95.3% of the patients had a Blatchford scored greater than 0 and 61.9% required blood transfusion. A Pearson correlation index of 0.815 was found. Conclusions: The Pearson correlation showed a positive relationship between the variables, finding that the Blatchford scale was useful in determining which patients required blood transfusion when a cutoff 3 was used.

Monetary Policy and Real Currency Appreciation: A BEER Model for the Mexican Peso

Carlos A. Ibarra 한국국제경제학회 2011 International Economic Journal Vol.25 No.1

notable feature of the Mexican economy since the late 1980s was the persistent real appreciation of the peso. The appreciation - a key development that helps to explain Mexico's slow rate of economic growth - took place despite changes in the exchange-rate regime, yet with an unchanging focus of monetary policy on gradually reducing the inflation rate. Thus, the frequent assumption that only real-side variables (as opposed to monetary ones) have a lasting or 'long-run' effect on the real exchange may not suit the recent Mexican case. The paper presents the results of an econometric study of exchange rate determination in Mexico for the period 1990Q1-2006Q4. The study is based on the so-called BEER (Behavioral Equilibrium Exchange Rate) model, which relies on Johansen's cointegration methodology and jointly considers real-side and monetary determinants. The estimation results - in the form of two- and three-equation cointegration models - show that, controlling for the influence of real-side determinants, the peso-dollar interest differential had a statistically and economically significant long-run effect on the peso's real exchange rate.

Graphene exfoliation with supercritical fluids

Rodolfo Morales Ibarra,Motonobu Goto,Juan Garc?a‑Serna,Saida Mayela Garc?a Montes 한국탄소학회 2021 Carbon Letters Vol.31 No.1

Graphene is an unconventional material with a two-dimensional hexagonal crystalline array of elemental carbon atoms and outstanding properties; accordingly, a desirable objective in the line of research of graphene is the development of novel and more productive methods of synthesis, validating its properties and applications. In our exploratory research, we have effectively exfoliated graphene from graphite using supercritical fluids (water, ethanol and carbon dioxide). The exfoliated graphene was properly characterized; via scanning electron microscopy, the morphology of graphene was observed; Raman spectra confirmed the exfoliation of graphene depicting the characteristic shift towards smaller Raman number in the 2D band (2676 cm?1) compared to that of graphite (? 2700 cm?1); COMMIT; transmission electron microscopy analysis exhibited the crystalline structure of graphene attesting also the expected transparency of exfoliated layers. Graphene exfoliation from graphite by supercritical fluids promises to be a simple large-scale method for graphene production.

The Role of Psychological Factors in Noncardiac Chest Pain of Esophageal Origin

Fernando Gonzalez-Ibarra,Mauricio Cruz-Ruiz,Joel Murillo Llanes,Sami R Achem,Ronnie Fass 대한소화기 기능성질환∙운동학회 2024 Journal of Neurogastroenterology and Motility (JNM Vol.30 No.3

ackground/AimsNoncardiac chest pain (NCCP) of esophageal origin is a challenging clinical problem of diverse etiology that affects more than 80 million Americans yearly. We assess the prevalence and impact of psychological disorders on NCCP of esophageal origin, describe possible mechanisms associated with this condition, and review psychological therapy options. MethodsOnline search using PubMed and Medline from January 1, 1966, to April 30, 2023. ResultsPsychological disorders have been reported in up to 79% of patients with NCCP of esophageal origin. Several psychological disturbances have been identified with this condition, including depression, anxiety, panic disorder, phobias, and obsessive-compulsive and somatoform disorders. It is unclear whether the psychological disorders trigger the chest pain or vice versa. Multiple psychological mechanisms have been linked to chest pain and may contribute to its pathogenesis and severity. These mechanisms include cardiophobia, poor coping strategies, negative social problem solving, stress and perceived control, hypervigilance to cardiopulmonary sensations, altered pain perception, and alexithymia. Psychological therapies for NCCP of esophageal origin include cognitive behavioral therapy, hypnotherapy, physical and relaxation training, breathing retraining, and alternative medicine. Among the therapeutic options, cognitive behavioral therapy has been shown to be an effective treatment for NCCP of esophageal origin. ConclusionThis review raises awareness about the high prevalence of psychological disorders in NCCP of esophageal origin and highlights the need for clinical trials and trained therapists to address the management of this taxing clinical problem.