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Menéndez M, Castellví-Bel S, Pineda M, De Cid R, Muñoz J, González S, Teulé À, Balaguer F, Ramón y Cajal T, Reñé JM, Blanco I, Castells A, Capellà G. Founder effect of a pathogenic MSH2 mutation identified in Spanish families with Lynch syndrome. Clin Genet 2010; 78:186-90. [DOI: 10.1111/j.1399-0004.2009.01346.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Lobera MP, Téllez C, Herguido J, Menéndez M. Pt−Sn/MgAl2O4 as n-Butane Dehydrogenation Catalyst in a Two-Zone Fluidized-Bed Reactor. Ind Eng Chem Res 2009. [DOI: 10.1021/ie900381p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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53
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Lozano Z, Guasch E, Claros E, Menéndez M, Gilsanz F. [Epidural anesthesia for cesarean section in a woman with a cavernous hemangioma of the temporal lobe]. REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2009; 56:332-333. [PMID: 19580143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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54
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Roldán L, Mallada R, Fraile JM, Mayoral JA, Menéndez M. Glycerol upgrading by ketalization in a zeolite membrane reactor. ASIA-PAC J CHEM ENG 2009. [DOI: 10.1002/apj.243] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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55
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Ribacoba R, Menéndez M, Salas-Puig J. [Refractory epilepsy and crossed cerebellar diaschisis]. Neurologia 2009; 24:211-213. [PMID: 19418301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
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56
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Lobera MP, Téllez C, Herguido J, Menéndez M. Propane Dehydrogenation over Pt−Sn−K/γ-Al2O3 Catalyst in a Two-Zone Fluidized Bed Reactor. Ind Eng Chem Res 2008. [DOI: 10.1021/ie800848c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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57
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Arce L, Menéndez M, Garrido-Delgado R, Valcárcel M. Sample-introduction systems coupled to ion-mobility spectrometry equipment for determining compounds present in gaseous, liquid and solid samples. Trends Analyt Chem 2008. [DOI: 10.1016/j.trac.2008.01.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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58
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Navajas A, Mallada R, Téllez C, Coronas J, Menéndez M, Santamaría J. Study on the reproducibility of mordenite tubular membranes used in the dehydration of ethanol. J Memb Sci 2007. [DOI: 10.1016/j.memsci.2007.04.038] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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59
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Viana M, Querol X, Alastuey A, Gil JI, Menéndez M. Identification of PM sources by principal component analysis (PCA) coupled with wind direction data. CHEMOSPHERE 2006; 65:2411-8. [PMID: 16766018 DOI: 10.1016/j.chemosphere.2006.04.060] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2005] [Revised: 04/18/2006] [Accepted: 04/20/2006] [Indexed: 05/10/2023]
Abstract
The effectiveness of combining principal component analysis (PCA) with multi-linear regression (MLRA) and wind direction data was demonstrated in this study. PM data from three grain-size fractions from a highly industrialised area in Northern Spain were analysed. Seven independent PM sources were identified by PCA: steel (Pb, Zn, Cd, Mn) and pigment (Cr, Mo, Ni) manufacture, road dust (Fe, Ba, Cd), traffic exhaust (P, OC + EC), regional-scale transport (, , V), crustal contributions (Al2O3, Sr, K) and sea spray (Na, Cl). The spatial distribution of the sources was obtained by coupling PCA with wind direction data, which helped identify regional drainage flows as the main source of crustal material. The same analysis showed that the contribution of motorway traffic to PM10 levels is 4-5 microg m-3 higher than that of local traffic. The coupling of PCA-MLRA with wind direction data proved thus to be useful in extracting further information on source contributions and locations. Correct identification and characterisation of PM sources is essential for the design and application of effective abatement strategies.
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Gascón J, Valenciano R, Téllez C, Herguido J, Menéndez M. A generalized kinetic model for the partial oxidation of n-butane to maleic anhydride under aerobic and anaerobic conditions. Chem Eng Sci 2006. [DOI: 10.1016/j.ces.2006.05.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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61
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Coto E, Menéndez M, Navarro R, García-Castro M, Alvarez V. A new de novo Notch3 mutation causing CADASIL. Eur J Neurol 2006; 13:628-31. [PMID: 16796587 DOI: 10.1111/j.1468-1331.2006.01337.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cerebral autosomal dominant arteriopathy with subcortical infarcts and leucoencephalopathy (CADASIL) is one of the most common hereditary forms of stroke, and migraine with aura, mood disorders, or dementia, are also frequently found in these patients. Missense mutations in the Notch3 gene that create or destroy cysteine residues, have been found in most cases with a family history of the disease, although a few sporadic cases harbouring Notch3 mutations have also been described. Here, we describe a 44-year-old patient with clinical features of CADASIL who was a carrier of a new Notch3 mutation: cys128-->gly. Both parents were alive and healthy, and negative for the mutation. This case illustrates the interest of analysing the Notch3 gene in cases with clinical features of CADASIL, even in the absence of a family history of the disease.
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Menéndez M, Paredes B, Iglesias O, Rendueles M, Díaz M. Rheological Behavior and Organoleptic Effects of Ovalbumin Addition in Yogurt Mousse Production. J Dairy Sci 2006; 89:951-62. [PMID: 16507689 DOI: 10.3168/jds.s0022-0302(06)72160-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Yogurt mousse is a novel, high added-value dairy product that has been well received by the market. This paper presents a study of the effect of the addition of ovalbumin to the product on its rheological and organoleptic qualities. The ovalbumin was previously separated from egg white with a high grade of purity using an ion exchange resin synthesized by the authors. Diverse rheological tests at different temperatures and corresponding sensorial assessments were conducted to compare samples without and with added ovalbumin. The obtained results confirm that the product is viscoelastic and combines the properties of foams and emulsions; the elastic component is greater than the viscous component. Moreover, at temperatures ranging from 5 to 15 degrees C, a usual interval of consumption, the product behaves rheologically in a similar way. Conversely, the addition of ovalbumin under the assayed conditions also makes the elastic character of the product increase at a given temperature. Finally, the sensorial assessment tests and determinations of stability and volume yield enabled us to verify that the addition of ovalbumin at an amount of 1.3% hardly alters the stability, resistance to shear stress, or the texture and improves the degree of foaming. Therefore, the product with additive is of good commercial quality.
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63
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Navajas A, Mallada R, Téllez C, Coronas J, Menéndez M, Santamaría J. The use of post-synthetic treatments to improve the pervaporation performance of mordenite membranes. J Memb Sci 2006. [DOI: 10.1016/j.memsci.2005.06.038] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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64
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Gascón J, Téllez C, Herguido J, Jakobsen HA, Menéndez M. Modeling of fluidized bed reactors with two reaction zones. AIChE J 2006. [DOI: 10.1002/aic.11002] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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65
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Gascón J, Téllez C, Herguido J, Menéndez M. Fluidized Bed Reactors with Two-Zones for Maleic Anhydride Production: Different Configurations and Effect of Scale. Ind Eng Chem Res 2005. [DOI: 10.1021/ie050638p] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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66
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Amaral GA, Aoiz FJ, Bañares L, Barr J, Herrero VJ, Martínez-Haya B, Menéndez M, Pino GA, Tanarro I, Torres I, Verdasco JE. Low-Temperature Rotational Relaxation of CO in Self-Collisions and in Collisions with Ne and He. J Phys Chem A 2005; 109:9402-13. [PMID: 16866388 DOI: 10.1021/jp051766u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The low-temperature rotational relaxation of CO in self-collisions and in collisions with the rare-gas atoms Ne and He has been investigated in supersonic expansions with a combination of resonance-enhanced multiphoton ionization (REMPI) spectroscopy and time-of-flight techniques. For the REMPI detection of CO, a novel 2 + 1' scheme has been employed through the A(1)Pi state of CO. From the measured data, average cross sections for rotational relaxation have been derived as a function of temperature in the range 5-100 K. For CO-Ne and CO-He, the relaxation cross sections grow, respectively, from values of approximately 20 and 7 A(2) at 100 K to values of approximately 65-70 and approximately 20 A(2) in the 5-20 K temperature range. The cross section for the relaxation of CO-CO grows from a value close to 40 A(2) at 100 K to a maximum of 60 A(2) at 20 K and then decreases again to 40 A(2) at 5 K. These results are qualitatively similar to those obtained previously with the same technique for N(2)-N(2), N(2)-Ne, and N(2)-He collisions, although in the low-temperature range (T < 20 K) the CO relaxation cross sections are significantly larger than those for N(2). Some discrepancies have been found between the present relaxation cross sections for CO-CO and CO-He and the values derived from electron-induced fluorescence experiments.
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67
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Finol C, Menéndez M, Santamaría J. Regeneration of Coked Catalysts in a Polytropic Reactor. Ind Eng Chem Res 2005. [DOI: 10.1021/ie0491443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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68
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Herguido J, Menéndez M, Santamaría J. On the use of fluidized bed catalytic reactors where reduction and oxidation zones are present simultaneously. Catal Today 2005. [DOI: 10.1016/j.cattod.2004.11.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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69
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Gállego I, Mallada R, Urriolabeitia EP, Navarro R, Menéndez M, Santamaría J. Selective separation of homogeneous catalysts using silicalite membranes. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.06.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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70
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Querol X, Alastuey A, Rodríguez S, Viana MM, Artíñano B, Salvador P, Mantilla E, García do Santos S, Fernandez Patier R, de La Rosa J, Sanchez de la Campa A, Menéndez M, Gil JJ. Levels of particulate matter in rural, urban and industrial sites in Spain. THE SCIENCE OF THE TOTAL ENVIRONMENT 2004; 334-335:359-376. [PMID: 15504522 DOI: 10.1016/j.scitotenv.2004.04.036] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/01/2004] [Indexed: 05/24/2023]
Abstract
This paper summarises the results of a series of studies on the interpretation of time series of levels of total suspended particles (TSP) and particulate matter (PM, <10 microm) in six regions of Spain in the period 1996-2000. In addition to the local pollution events, high PM10 episodes are recorded during African dust outbreaks, regional atmospheric recirculation events (mainly in spring to autumn), and to a lesser extent, under the influence of European and Mediterranean long range transported air masses. The lowest PM10 levels are usually recorded under Atlantic air mass advective conditions. All these regional and large-scale processes account for the relatively high PM10 levels recorded in regional background stations in Spain. Thus, the PM10 levels recorded at EMEP (Cooperative Program for Monitoring and Evaluation of the Long Range Transmission of Air Pollutants in Europe) regional background stations between March 2001 and March 2002 are very close to the annual limit value proposed for 2010 by the EU Air Quality Directive 1999/30/CE. Chemical data obtained for the different monitoring stations during 2001 show a high mineral load in PM10 for most of the study sites in Spain. Furthermore, a high marine aerosol load is evidenced in the Canary Islands. These mineral and marine loads are lower when considering PM2.5, but a relatively high proportion (8-21%) of mineral dust is still present.
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Abstract
This paper describes a procedure for the detection and quantification of ethyl-glucuronide (EtG) in hair samples. During method development the efficacy of extraction of EtG from hair was compared in four extraction methods: (a) methanol; (b) methanol:water (1:1); (c) water; and (d) water:trifluoroacetic acid (9:1). In addition, three derivatizing agents were compared as well: N,O-bistrimethylsilyl-trifluoroacetamide (BSTFA): trimethylchlorosilane (TMCS) (99:1), pentafluoropropionic anhydride (PFPA) and heptafluorobutyric anhydride (HFBA). Water was found to be the best extracting solvent and PFPA the best derivatizing agent. Both provided the highest recoveries, with cleaner extracts and more stable derivatives. The final method is as follows: about 100mg of hair are sequentially washed with water and acetone. The decontaminated sample is finely cut with scissors, then the deuterated internal standard (EtG-d5) and 2 mL of water are added. After sonication for 2 h, the sample is maintained at room temperature overnight. Derivatization is performed with PFPA. Derivatives are injected into a GC-MS system in the electronic impact mode. The method shows linearity over the range of concentrations from 0.050 to 5 ng/mg. Detection and quantification limits are 0.025 and 0.050 ng/mg, respectively. Mean recoveries for the three studied concentrations (low, medium and high) are higher than 87%. The coefficients of variation in intra- and inter-assay precision are always lower than 7%. The method is being routinely applied in our lab for the diagnosis of chronic alcohol consumption.
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72
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Varela S, Mendez J, González de la Cuesta C, Iglesias I, González C, Menéndez M. Characteristics of pollinosis caused by Betula in patients from Ourense (Galicia, Spain). J Investig Allergol Clin Immunol 2004; 13:124-30. [PMID: 12968397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023] Open
Abstract
UNLABELLED A retrospective study was performed to describe the features of the pollinosis caused by Betula in the area of Ourense, Spain. The pollen count was carried out with a Lanzoni volumetric Hirts spore trap (1993-2000). The Betula pollen represented 5% over the annual total (annual mean quantity: 965 grains). It was present in the air from March to mid-May. The highest peaks took place in April (maximum values mean: 131 grains/m3). The medical records of 222 patients (mean age 25.66 years) diagnosed with pollinosis (1998-2000), who lived at less than 30 km. from the spore trap, were reviewed. In all of them, the skin-prick test (SPT) was carried out with pollen allergens. The percentages of positive SPT were: Lolium perenne, 91.89% (16.6% monosensitized); Plantago lanceolata, 71.17% (1.26% monosensitized); Betula alba, 41.89% (10.75% monosensitized); Platanus hybrida, 34.95%; Olea europea, 10.36%; and Parietaria judaica, 6.3%. The mean age of Betula monosensitized patients was 44.7 years. The majority of them had symptoms in March-April, 40% had asthma symptoms, 80% had lived in Central Europe, and 30% of them presented an oral allergy syndrome to fruits. There were 41.93% of the patients with positive SPT to Betula pollen who had asthma symptoms, in comparison with 23.25% of the patients with negative SPT to Betula (p = 0.0034). There were 20.28% of the patients with positive SPT to Betula pollen, who had lived in Central Europe, in comparison with 4.27% of the patients with negative SPT to Betula, p: 0.00049. The relative risk of sensitization was 2.05. CONCLUSIONS Betula pollen was the second cause of clinical pollinosis in our patients, after grass, being responsible of the symptoms in the early spring, in a small number of the patients in their forties. The presence of asthma was higher in Betula sensitized patients, and the residence in Central Europe was a sensitization risk factor.
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Cortés I, Rubio O, Herguido J, Menéndez M. Kinetics under dynamic conditions of the oxidative dehydrogenation of butane with doped V/MgO. Catal Today 2004. [DOI: 10.1016/j.cattod.2004.03.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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74
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Rubio O, Herguido J, Menéndez M, Grasa G, Abanades JC. Oxidative dehydrogenation of butane in an interconnected fluidized-bed reactor. AIChE J 2004. [DOI: 10.1002/aic.10134] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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75
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Bernal MP, Coronas J, Menéndez M, Santamaría J. Separation of CO2/N2mixtures using MFI-type zeolite membranes. AIChE J 2004. [DOI: 10.1002/aic.10012] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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76
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Rubio O, Herguido J, Menéndez M. Oxidative dehydrogenation of n-butane on V/MgO catalysts—kinetic study in anaerobic conditions. Chem Eng Sci 2003. [DOI: 10.1016/j.ces.2003.07.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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77
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García-Repetto R, Moreno E, Soriano T, Jurado C, Giménez MP, Menéndez M. Tissue concentrations of MDMA and its metabolite MDA in three fatal cases of overdose. Forensic Sci Int 2003; 135:110-4. [PMID: 12927411 DOI: 10.1016/s0379-0738(03)00179-8] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The recreational use of amphetamine derivatives has become increasingly popular in our country in past recent years. Their use is especially common among young people participating in dance parties known as "raves." As a direct consequence of their increased use, the number of fatal cases in which these compounds have been involved have increased dramatically since the second half of the last decade. In our laboratory, we have registered 25 cases related to amphetamine derivatives use since 1996. Three of them were deeply studied and the results obtained are presented in this paper. This information may be useful for the interpretation of the results obtained in toxicological analysis in the cases in which death may be attributed to MDMA use.
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78
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Aoiz F, Bañares L, Herrero V, Martı́nez-Haya B, Menéndez M, Quintana P, Tanarro I, Verdasco E. Low temperature rotational relaxation of N2 in collisions with He. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(02)01761-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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79
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Alba E, Ribelles N, Antón A, Pérez-Carrión R, López-Vega JM, Llanos M, Pelegri A, Florián J, Menéndez M, Godes MJ. Sequential doxorubicin and docetaxel as first-line treatment in metastatic breast cancer: a GEICAM-9801 phase II study. Breast Cancer Res Treat 2003; 77:1-8. [PMID: 12602899 DOI: 10.1023/a:1021158711030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
PURPOSE To evaluate the efficacy and the toxicity profile of the sequential administration of doxorubicin and docetaxel as first-line chemotherapy in metastatic breast cancer (MBC). PATIENTS AND METHODS Eighty-one patients received a total of 436 cycles of chemotherapy: 236 of doxorubicin (75 mg/m2) and 200 of docetaxel (100 mg/m2 every 21 days). The first 35 patients received doxorubicin every 14 days with G-CSF support, and in the other 46 cases doxorubicin was administered every 21 days without G-CSF. RESULTS After entire treatment the overall response rate was 65% (18 complete responses). With a median follow-up of 19 months (range, 1-48 months), the median time to progression was 11.3 months and the median survival time was 31 months. As expected, febrile neutropenia was the most important toxicity and it appeared in 26 cycles (6%) and 19 patients (23%). In the patients that received doxorubicin every 14 days, the febrile neutropenia incidence was higher during docetaxel treatment, especially after its first administration. CONCLUSIONS The dose and schedule of doxorubicin and docetaxel used in this trial seems to be active in first-line treatment of patients with MBC. The toxicity profile appears to be better than observed with concomitant schedules.
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Rubio O, Mallada R, Herguido J, Menéndez M. Experimental Study on the Oxidation of Butane to Maleic Anhydride in a Two-Zone Fluidized Bed Reactor. Ind Eng Chem Res 2002. [DOI: 10.1021/ie020097t] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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81
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Bernal MP, Coronas J, Menéndez M, Santamaría J. Characterization of Zeolite Membranes by Measurement of Permeation Fluxes in the Presence of Adsorbable Species. Ind Eng Chem Res 2002. [DOI: 10.1021/ie0200914] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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82
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Pedernera M, Alfonso M, Menéndez M, Santamarı́a J. Simulation of a catalytic membrane reactor for the oxidative dehydrogenation of butane. Chem Eng Sci 2002. [DOI: 10.1016/s0009-2509(02)00120-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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83
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Hou K, Hughes R, Ramos R, Menéndez M, Santamarı́a J. Corrigendum to: “Simulation of a membrane reactor for oxidative dehydrogenation of propane, incorporating radial concentration and temperature profiles”. Chem Eng Sci 2002. [DOI: 10.1016/s0009-2509(02)00151-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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84
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Varela S, Díez MS, Gonzalez C, Gonzalez de la Cuesta C, Arenas L, Feijoó R, Menéndez M. Oral desensitization to 5-ASA. Allergy 2002; 57:371-2. [PMID: 11906377 DOI: 10.1034/j.1398-9995.2001.1n3420.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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85
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Bernal M, Coronas J, Menéndez M, Santamarı́a J. Characterization of zeolite membranes by temperature programmed permeation and step desorption. J Memb Sci 2002. [DOI: 10.1016/s0376-7388(01)00557-9] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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86
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Turlan D, Urriolabeitia EP, Navarro R, Royo C, Menéndez M, Santamaría J. Separation of Pd complexes from a homogeneous solution using zeolite membranes. Chem Commun (Camb) 2001. [DOI: 10.1039/b109030p] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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87
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Soler J, Téllez C, Herguido J, Menéndez M, Santamarı́a J. Modelling of a two-zone fluidised bed reactor for the oxidative dehydrogenation of n-butane. POWDER TECHNOL 2001. [DOI: 10.1016/s0032-5910(01)00352-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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88
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Arruebo M, Coronas J, Menéndez M, Santamarı́a J. Separation of hydrocarbons from natural gas using silicalite membranes. Sep Purif Technol 2001. [DOI: 10.1016/s1383-5866(01)00054-5] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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89
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Aoiz FJ, Bañares L, Castillo JF, Menéndez M, Skouteris D, Werner HJ. A quantum mechanical and quasi-classical trajectory study of the Cl+H2 reaction and its isotopic variants: Dependence of the integral cross section on the collision energy and reagent rotation. J Chem Phys 2001. [DOI: 10.1063/1.1385155] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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90
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Aoiz FJ, Bañares L, Herrero VJ, Martínez-Haya B, Menéndez M, Quintana P, Tanarro I, Verdasco E. Low-Temperature Rotational Relaxation of N2 in Collisions with Ne. J Phys Chem A 2001. [DOI: 10.1021/jp010845c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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91
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Piera E, Téllez C, Coronas J, Menéndez M, SaIntamarı́a J. Use of zeolite membrane reactors for selectivity enhancement: application to the liquid-phase oligomerization of i-butene. Catal Today 2001. [DOI: 10.1016/s0920-5861(01)00304-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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92
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Soriano T, Jurado C, Menéndez M, Repetto M. Improved solid-phase extraction method for systematic toxicological analysis in biological fluids. J Anal Toxicol 2001; 25:137-43. [PMID: 11300506 DOI: 10.1093/jat/25.2.137] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A method for the simultaneous qualitative and quantitative determination of drugs of abuse (opiates, cocaine, or amphetamines) and prescribed drugs (tricyclic antidepressants, phenotiazines, benzodiazepines, etc.) in biological fluids--blood, urine, bile, and gastric contents--was developed. This procedure involves solid-phase extraction with Bond-Elut Certify columns followed by analysis by gas chromatography-nitrogen-phosphorus detection (GC-NPD) and confirmation by gas chromatography-mass spectrometry (GC-MS), after derivatization, when necessary. Pretreatment was performed on all samples: sonication for 15 min plus enzymatic hydrolysis with beta-glucuronidase in urine. With respect to the internal standards, nalorphine and trihexylamine were used for basic substances, allobarbital for acidic drugs, and prazepam for benzodiazepines. Acidic and basic compounds were extracted from different aliquots of samples at different pH levels: 6-6.5 for the acidic and neutral and 8-8.5 for the basic and the benzodiazepines. Several areas of experimental design were considered in the process of method optimization. These included internal standards, pH, sonication, flow rate and washing solvents. It was found that systematic analysis could be reliably performed using optimized extraction conditions. The recovery rates for the compounds tested were always higher than 61.02%.
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93
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Menéndez M, Morales D, Pardo L, Vajda I. APPROXIMATIONS TO POWERS OF φ-DISPARITY GOODNESS-OF-FIT TESTS *. COMMUN STAT-THEOR M 2001. [DOI: 10.1081/sta-100001562] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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94
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M.J. Alfonso,, Menéndez M, Santamaría J. Coupling of Consecutive Reactions in a Two-Layer, Flow-Through Catalytic Membrane. Ind Eng Chem Res 2001. [DOI: 10.1021/ie000643n] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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95
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Hou K, Hughes R, Ramos R, Menéndez M, Santamarı́a J. Simulation of a membrane reactor for oxidative dehydrogenation of propane, incorporating radial concentration and temperature profiles. Chem Eng Sci 2001. [DOI: 10.1016/s0009-2509(00)00422-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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96
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Menéndez M, Martínez M, Comín FA. A comparative study of the effect of pH and inorganic carbon resources on the photosynthesis of three floating macroalgae species of a Mediterranean coastal lagoon. JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY 2001; 256:123-136. [PMID: 11137509 DOI: 10.1016/s0022-0981(00)00313-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study examines the effect of pH changes on photosynthetic characteristics and the role of dissolved inorganic carbon (DIC) in determining the dominance of three species of macroalgae Chaetomorpha linum (O.F. Müller) Kützing, Gracilaria verrucosa (Hudson) Papenfuss and Ulva sp. in a Mediterranean coastal lagoon. Fluctuations of pH were measured in the lagoon in summer. Water column CO(2) and HCO(3)(-) concentrations inside the algal mat showed significant diurnal fluctuations, from a morning peak to an afternoon low, decreasing 96 and 40%, respectively. The response of photosynthesis to increased pH was examined in laboratory conditions in spring (May) and summer (July). The photosynthetic rate declined rapidly at pH above 8.5 and below 6.5. G. verrucosa responded differently in spring and summer showing acclimation to higher pH in summer than in spring. In Ulva sp. incubations, we observed optimum photosynthesis between pH 6 and 7.5. The decrease in photosynthetic rate below pH 6 was lower (12.30%) than above pH 8 (81.03%). This difference may be related to the origin of the macroalgae, suggesting acclimation to the original pH of the environment. Results from instantaneous photosynthesis measurements indicate that low DIC-availability limits the photosynthetic capacity of G. verrucosa, C. linum and Ulva sp. in spring and of C. linum at high irradiances in summer. Our results also show that G. verrucosa has a higher efficiency at low CO(2) concentrations than C. linum and Ulva sp. It is suggested that G. verrucosa may be better adapted to maintain higher photosynthetic rates than other macroalgae in conditions of tissue N sufficiency and low water DIC concentrations which are typical of shallow coastal environments in summer.
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97
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98
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Varea J, Saiz JL, López-Zumel C, Monterroso B, Medrano FJ, Arrondo JL, Iloro I, Laynez J, Garcia JL, Menéndez M. Do sequence repeats play an equivalent role in the choline-binding module of pneumococcal LytA amidase? J Biol Chem 2000; 275:26842-55. [PMID: 10849429 DOI: 10.1074/jbc.m004379200] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
LytA amidase breaks down the N-acetylmuramoyl-l-alanine bonds in the peptidoglycan backbone of Streptococcus pneumoniae. Its polypeptide chain has two modules: the NH(2)-terminal module, responsible for the catalytic activity, and the COOH-terminal module, constructed by six tandem repeats of 20 or 21 amino acids (p1-p6) and a short COOH-terminal tail. The polypeptide chain must contain at least four repeats to efficiently anchor the autolysin to the choline residues of the cell wall. Nevertheless, the catalytic efficiency decreases by 90% upon deletion of the final tail. The structural implications of deleting step by step the two last (p5 and p6) repeats and the final COOH-tail and their effects on choline-amidase interactions have been examined by comparing four truncated mutants with LytA amidase by means of different techniques. Removal of this region has minor effects on secondary structure content but significantly affects the stability of native conformations. The last 11 amino acids and the p5 repeat stabilize the COOH-terminal module; each increases the module transition temperature by about 6 degrees C. Moreover, the p5 motif also seems to participate, in a choline-dependent way, in the stabilization of the NH(2)-terminal module. The effects of choline binding on the thermal stability profile of the mutant lacking the p5 repeat might reflect a cooperative pathway providing molecular communication between the choline-binding module and the NH(2)-terminal region. The three sequence motives favor the choline-amidase interaction, but the tail is an essential factor in the monomer <--> dimer self-association equilibrium of LytA and its regulation by choline. The final tail is required for preferential interaction of choline with LytA dimers and for the existence of different sets of choline-binding sites. The p6 repeat scarcely affects the amidase stability but could provide the proper three-dimensional orientation of the final tail.
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99
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Aoiz FJ, Bañares L, Bohm T, Hanf A, Herrero VJ, Jung KH, Läuter A, Lee KW, Menéndez M, Sáez Rábanos V, Tanarro I, Volpp HR, Wolfrum J. Experimental and Theoretical Reaction Cross Sections for the H + HCl System. J Phys Chem A 2000. [DOI: 10.1021/jp001555j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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100
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Pacheco M, Soler J, Dejoz A, López Nieto J, Herguido J, Menéndez M, Santamarı́a J. MoO3/MgO as a catalyst in the oxidative dehydrogenation of n-butane in a two-zone fluidized bed reactor. Catal Today 2000. [DOI: 10.1016/s0920-5861(00)00367-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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