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Torres E, López-Cerero L, Morales I, Navarro M, Rodríguez-Baño J, Pascual A. Prevalence and transmission dynamics of Escherichia coli ST131 among contacts of infected community and hospitalized patients. Clin Microbiol Infect 2018; 24:618-623. [DOI: 10.1016/j.cmi.2017.09.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 07/18/2017] [Accepted: 09/12/2017] [Indexed: 11/24/2022]
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Ballestero-Téllez M, Docobo-Pérez F, Portillo-Calderón I, Rodríguez-Martínez JM, Racero L, Ramos-Guelfo MS, Blázquez J, Rodríguez-Baño J, Pascual A. Molecular insights into fosfomycin resistance in Escherichia coli. J Antimicrob Chemother 2018; 72:1303-1309. [PMID: 28093485 DOI: 10.1093/jac/dkw573] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 12/12/2016] [Indexed: 11/12/2022] Open
Abstract
Objectives Fosfomycin activity in Escherichia coli depends on several genes of unknown importance for fosfomycin resistance. The objective was to characterize the role of uhpT , glpT , cyaA and ptsI genes in fosfomycin resistance in E. coli. Methods WT E. coli BW25113 and null mutants, Δ uhpT , Δ glpT , Δ cyaA , Δ ptsI , Δ glpT-uhpT , Δ glpT-cyaA , Δ glpT-ptsI , Δ uhpT-cyaA , Δ uhpT-ptsI and Δ ptsI-cyaA , were studied. Susceptibility to fosfomycin was tested using CLSI guidelines. Fosfomycin mutant frequencies were determined at concentrations of 64 and 256 mg/L. Fosfomycin in vitro activity was tested using time-kill assays at concentrations of 64 and 307 mg/L (human C max ). Results Fosfomycin MICs were: WT E. coli BW25113 (2 mg/L), Δ glpT (2 mg/L), Δ uhpT (64 mg/L), Δ cyaA (8 mg/L), Δ ptsI (2 mg/L), Δ glpT-uhpT (256 mg/L), Δ glpT-cyaA (8 mg/L), Δ glpT-ptsI (2 mg/L), Δ uhpT-cyaA (512 mg/L), Δ uhpT-ptsI (64 mg/L) and Δ ptsI-cyaA (32 mg/L). In the mutant frequency assays, no mutants were recovered from BW25113. Mutants appeared in Δ glpT , Δ uhpT , Δ cyaA and Δ ptsI at 64 mg/L and in Δ uhpT and Δ cyaA at 256 mg/L. Δ glpT-ptsI , but not Δ glpT-cyaA , Δ uhpT-cyaA or Δ uhpT-ptsI , increased the mutant frequency compared with the highest frequency found in each single mutant. In time-kill assays, all mutants regrew at 64 mg/L. Initial bacterial reductions of 2-4 log 10 cfu/mL were observed for all strains, except for Δ uhpT-ptsI , Δ glpT-uhpT and Δ uhpT-cyaA . Only Δ glpT and Δ ptsI mutants were cleared using 307 mg/L. Conclusions Fosfomycin MIC may not be a good efficacy predictor, as highly resistant mutants may appear, depending on other pre-existing mutations with no impact on MIC.
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Casanova B, Coret F, Valero C, Landete L, Pascual A, Vilchez JJ. High clinical inflammatory activity prior to the development of secondary progression: a prospective 5-year follow-up study. Mult Scler 2017. [DOI: 10.1177/135245850200800111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objective: To study if there are different patterns of clinical activity - measured by the annual exacerbation rate (AER) - among relapsing-remitting multiple sclerosis (RRMS), "early" secondary multiple sclerosis (SPMS) and "late" SPMS. Methods: A prospective 5-year follow-up study in 80 MS patients has been carried out, calculating the AER and the mean expanded disability status scale (EDSS) change rate (MCR). Results: A significant difference on the AER, among RRMS, early SPMS and late SPMS, has been found. Conclusions: The SPMS has a high clinical inflammatory activity before and during its transformation from a RRMS. Multiple Sclerosis (2002) 8, 59-63
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Ballestero-Téllez M, Docobo-Pérez F, Rodríguez-Martínez J, Conejo M, Ramos-Guelfo M, Blázquez J, Rodríguez-Baño J, Pascual A. Role of inoculum and mutant frequency on fosfomycin MIC discrepancies by agar dilution and broth microdilution methods in Enterobacteriaceae. Clin Microbiol Infect 2017; 23:325-331. [DOI: 10.1016/j.cmi.2016.12.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 11/04/2016] [Accepted: 12/22/2016] [Indexed: 10/20/2022]
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Pascual A, Guerriero S, Rams N, Juez L, Ajossa S, Graupera B, Hereter L, Cappai A, Pero M, Perniciano M, Errasti T, Parra J, Solis M, Alcázar JL. Clinical and ultrasound features of benign, borderline, and malignant invasive mucinous ovarian tumors. EUR J GYNAECOL ONCOL 2017. [PMID: 29693878 DOI: 10.1002/uog.14971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
OBJECTIVE To compare clinical and sonographic features of benign, borderline, and malignant invasive mucinous ovarian tumors (MOTs). MATERIALS AND METHODS Retrospective observational multicenter study comprising 365 women (mean age: 46.1 years) with a histologically confirmed benign, borderline or malignant invasive MOT. Clinical data (patient's age, patient's complaints), tumor markers (CA-125 and CA-1 9.9), and sonographic data (tumor size, bilaterality, morphology -unilocular, multilocular, unilocular-solid, multilocular-solid and solid-, and IOTA color score) were reviewed and compared among these three groups. Women with ultrasound evidence on intra-abdominal disease spread were excluded. RESULTS Three hundred seventy-eight MOTs (14 women had bilateral lesions) were analyzed. Histologically, 287 tumors were benign, 51 were borderline, and 40 were malignant. No difference in patient's mean age was observed. Women with borderline or invasive tumors were less frequently asymptomatic. Tumors were larger in case of invasive lesions. Borderline and invasive tumors showed solid components and exhibited IOTA color score 3 or 4, more frequently than benign lesions (p < 0.001). However, the authors discovered that 16 out of 51 (31.4%) of borderline tumors and six out of 40 (15.0%) of invasive cancers had no solid components and a color score 1 or 2, and were considered as a benign lesion by the sonolo- gist. On the other hand, 96 out of 287 (33.4%) benign mucinous cystadenoma exhibited solid components and/or a color score of 3 or 4. CONCLUSIONS In spite of statistical differences, the authors observed significant overlapping in ultrasound features among benign, borderline, and invasive ovarian mucinous tumors that renders a difficult accurate preoperative discrimination among these lesions.
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Pascual A, de la Varga D, Arias CA, Van Oirschot D, Kilian R, Álvarez JA, Soto M. Hydrolytic anaerobic reactor and aerated constructed wetland systems for municipal wastewater treatment - HIGHWET project. ENVIRONMENTAL TECHNOLOGY 2017; 38:209-219. [PMID: 27241268 DOI: 10.1080/09593330.2016.1188995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The HIGHWET project combines the hydrolytic up-flow sludge bed (HUSB) anaerobic digester and constructed wetlands (CWs) with forced aeration for decreasing the footprint and improving effluent quality. The HIGHWET plant in A Coruña (NW of Spain) treating municipal wastewater consists of a HUSB and four parallel subsurface horizontal flow (HF) CWs. HF1, HF2 and HF3 units are fitted with forced aeration, while the control HF4 is not aerated. All the HF units are provided with effluent recirculation, but different heights of gravel bed (0.8 m in HF1 and HF2, and 0.5 m in HF3 and HF4) are implemented. Besides, a tobermorite-enriched material was added in the HF2 unit in order to improve phosphorus removal. The HUSB 76-89% of total suspended solids (TSS) and about 40% of chemical oxygen demand (COD) and biological oxygen demand (BOD). Aerated HF units reached above 96% of TSS, COD and BOD at a surface loading rate of 29-47 g BOD5/m2·d. An aeration regime ranging from 5 h on/3 h off to 3 h on/5 h off was found to be adequate to optimize nitrogen removal, which ranged from 53% to 81%. Average removal rates of 3.4 ± 0.4 g total nitrogen (TN)/m2·d and 12.8 ± 3.7 g TN/m3·d were found in the aerated units, being 5.5 and 4.1 times higher than those of the non-aerated system. The tobermorite-enriched HF2 unit showed a distinct higher phosphate (60-67%) and total phosphorus (54%) removal.
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Vallée B, Larrède L, Willaume V, Pascual A, Meineri S. Effets à long terme d’une stratégie engageante : augmenter le nombre d’adhésions de l’association sportive d’un collège mahorais. PRAT PSYCHOL 2016. [DOI: 10.1016/j.prps.2016.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Rodríguez Cubillo B, Pérez Flores I, Calvo N, Pascual A, Cortés J, Moreno M, Blanco J, Sánchez Fructuoso A. Antibody-Mediated Acute Vascular Rejection of Kidney Allografts: Fifteen-Year Follow-up. Transplant Proc 2016; 48:2917-2919. [DOI: 10.1016/j.transproceed.2016.09.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 08/20/2016] [Accepted: 09/02/2016] [Indexed: 11/16/2022]
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Docobo-Pérez F, Drusano GL, Johnson A, Goodwin J, Whalley S, Ramos-Martín V, Ballestero-Tellez M, Rodriguez-Martinez JM, Conejo MC, van Guilder M, Rodríguez-Baño J, Pascual A, Hope WW. Pharmacodynamics of fosfomycin: insights into clinical use for antimicrobial resistance. Antimicrob Agents Chemother 2015; 59:5602-10. [PMID: 26124169 PMCID: PMC4538498 DOI: 10.1128/aac.00752-15] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 06/23/2015] [Indexed: 11/20/2022] Open
Abstract
The aim of this study was to improve the understanding of the pharmacokinetic-pharmacodynamic relationships of fosfomycin against extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli strains that have different fosfomycin MICs. Our methods included the use of a hollow fiber infection model with three clinical ESBL-producing E. coli strains. Human fosfomycin pharmacokinetic profiles were simulated over 4 days. Preliminary studies conducted to determine the dose ranges, including the dose ranges that suppressed the development of drug-resistant mutants, were conducted with regimens from 12 g/day to 36 g/day. The combination of fosfomycin at 4 g every 8 h (q8h) and meropenem at 1 g/q8h was selected for further assessment. The total bacterial population and the resistant subpopulations were determined. No efficacy was observed against the Ec42444 strain (fosfomycin MIC, 64 mg/liter) at doses of 12, 24, or 36 g/day. All dosages induced at least initial bacterial killing against Ec46 (fosfomycin MIC, 1 mg/liter). High-level drug-resistant mutants appeared in this strain in response to 12, 15, and 18 g/day. In the study arms that included 24 g/day, once or in a divided dose, a complete extinction of the bacterial inoculum was observed. The combination of meropenem with fosfomycin was synergistic for bacterial killing and also suppressed all fosfomycin-resistant clones of Ec2974 (fosfomycin MIC, 1 mg/liter). We conclude that fosfomycin susceptibility breakpoints (≤64 mg/liter according to CLSI [for E. coli urinary tract infections only]) should be revised for the treatment of serious systemic infections. Fosfomycin can be used to treat infections caused by organisms that demonstrate lower MICs and lower bacterial densities, although relatively high daily dosages (i.e., 24 g/day) are required to prevent the emergence of bacterial resistance. The ratio of the area under the concentration-time curve for the free, unbound fraction of fosfomycin versus the MIC (fAUC/MIC) appears to be the dynamically linked index of suppression of bacterial resistance. Fosfomycin with meropenem can act synergistically against E. coli strains in preventing the emergence of fosfomycin resistance.
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Lavore A, Pascual A, Salinas FM, Esponda-Behrens N, Martinez-Barnetche J, Rodriguez M, Rivera-Pomar R. Comparative analysis of zygotic developmental genes in Rhodnius prolixus genome shows conserved features on the tracheal developmental pathway. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2015; 64:32-43. [PMID: 26187251 DOI: 10.1016/j.ibmb.2015.06.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 06/13/2015] [Accepted: 06/21/2015] [Indexed: 06/04/2023]
Abstract
Most of the in-depth studies on insect developmental genetic have been carried out in the fruit fly Drosophila melanogaster, an holometabolous insect, so much more still remains to be studied in hemimetabolous insects. Having Rhodnius prolixus sequenced genome available, we search for orthologue genes of zygotic signaling pathways, segmentation, and tracheogenesis in the R. prolixus genome and in three species of Triatoma genus transcriptomes, concluding that there is a high level of gene conservation. We also study the function of two genes required for tracheal system development in D. melanogaster - R. prolixus orthologues: trachealess (Rp-trh) and empty spiracles (Rp-ems). From that we see that Rp-trh is required for early tracheal development since Rp-trh RNAi shows that the primary tracheal branches fail to form. On the other hand, Rp-ems is implied in the proper formation of the posterior tracheal branches, in a similar way to D. melanogaster. These results represent the initial characterization of the genes involved in the tracheal development of an hemimetabolous insect building a bridge between the current genomic era and V. Wigglesworth's classical studies on insects' respiratory system physiology.
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Lavín-Alconero L, Rosso-Fernández C, Barriga-Ribera A, Sojo-Dorado J, Palacios Z, López-Hernández I, Merino V, Camean M, Pascual A, Rodríguez-Baño J. Fosfomycin Versus Meropenem In Bacteremic Urinary Tract Infections Caused By Extended-Spectrum Betalactamase Producing Escherichia Coli (Esbl-Ec): Forest Study. Clin Ther 2015. [DOI: 10.1016/j.clinthera.2015.05.108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Rodríguez MJ, Moreno-Cid M, Pascual A, Rubio A, López M, Moñux A, García J, Cabra J, Saavedra P. Delivery strategy for foetuses with cervical mass: The EXIT procedure. J OBSTET GYNAECOL 2015. [DOI: 10.3109/01443615.2015.1030603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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López-Hernández I, Delgado Valverde M, Batista Díaz N, Pascual A. First report of linezolid dependence in methicillin-resistant Staphylococcus aureus. Clin Microbiol Infect 2015; 21:650.e1-4. [DOI: 10.1016/j.cmi.2015.03.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 03/01/2015] [Accepted: 03/09/2015] [Indexed: 10/23/2022]
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López-Cortés LE, Velasco C, Retamar P, del Toro MD, Gálvez-Acebal J, de Cueto M, García-Luque I, Caballero FJ, Pascual A, Rodríguez-Baño J. Is reduced vancomycin susceptibility a factor associated with poor prognosis in MSSA bacteraemia? J Antimicrob Chemother 2015; 70:2652-60. [DOI: 10.1093/jac/dkv133] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Accepted: 04/21/2015] [Indexed: 11/13/2022] Open
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Broc G, Denis B, Gana K, Gendre I, Perrin P, Pascual A. Impact of the telephone motivational interviewing on the colorectal cancer screening participation. A randomized controlled study. EUROPEAN REVIEW OF APPLIED PSYCHOLOGY-REVUE EUROPEENNE DE PSYCHOLOGIE APPLIQUEE 2015. [DOI: 10.1016/j.erap.2015.04.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Gonzalez-Padilla M, Torre-Cisneros J, Rivera-Espinar F, Pontes-Moreno A, Lopez-Cerero L, Pascual A, Natera C, Rodriguez M, Salcedo I, Rodriguez-Lopez F, Rivero A, Rodriguez-Bano J. Gentamicin therapy for sepsis due to carbapenem-resistant and colistin-resistant Klebsiella pneumoniae. J Antimicrob Chemother 2014; 70:905-13. [DOI: 10.1093/jac/dku432] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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Vergara-Lopez S, Dominguez MC, Conejo MC, Pascual A, Rodriguez-Bano J. Prolonged treatment with large doses of fosfomycin plus vancomycin and amikacin in a case of bacteraemia due to methicillin-resistant Staphylococcus epidermidis and IMP-8 metallo- -lactamase-producing Klebsiella oxytoca. J Antimicrob Chemother 2014; 70:313-5. [DOI: 10.1093/jac/dku341] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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López-Cortés LE, Cisneros JM, Fernández-Cuenca F, Bou G, Tomás M, Garnacho-Montero J, Pascual A, Martínez-Martínez L, Vila J, Pachón J, Rodríguez Baño J. Monotherapy versus combination therapy for sepsis due to multidrug-resistant Acinetobacter baumannii: analysis of a multicentre prospective cohort. J Antimicrob Chemother 2014; 69:3119-26. [PMID: 24970742 DOI: 10.1093/jac/dku233] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Treatment of multidrug-resistant Acinetobacter baumannii (MDRAB) infection presents a challenge because of the scarcity of available options. Even though combination therapy (CT) is frequently used in clinical practice, data are needed to support its use instead of monotherapy (MT). METHODS A prospective observational study was conducted in 28 Spanish hospitals. Patients with sepsis caused by MDRAB, defined according to strict criteria, and who received active antibiotic treatment (according to in vitro susceptibility testing) for at least 48 h, were included. The main outcome variable was all-cause 30 day mortality after initiation of targeted therapy. Multivariate analysis, including a propensity score (for receiving CT), was performed by Cox regression. RESULTS One hundred and one patients were included in the analysis; 68 (67.3%) received MT and 33 (32.7%) received CT. Pneumonia was the most common infection (50.5%), 68.6% of cases being associated with mechanical ventilation. Colistin (67.6%) and carbapenems (14.7%) were the most common drugs used in MT; colistin plus tigecycline (27.3%) and carbapenem plus tigecycline (12.1%) were the most frequent combinations. Crude 30 day mortality was 23.5% and 24.2% for the MT and CT groups, respectively (RR = 1.03; 95% CI 0.49-2.16; P = 0.94). Multivariate analysis of 30 day survival showed no trend towards reduced 30 day mortality with CT (HR = 1.35; 95% CI 0.53-3.44; P = 0.53). Subgroup analysis showed similar results. CONCLUSIONS Our data do not support an association of CT with reduced mortality in MDRAB infections. More data for specific types of infection and combinations are needed.
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Lopez-Rodriguez E, Boden C, Knippenberg S, Pascual A, Perez-Gil J, Kolb M, Gauldie J, Maus U, Ochs M, Knudsen L. In vivo effects of TGF-β1 in lung surfactant regulation, lung meachanics amd structure. Pneumologie 2014. [DOI: 10.1055/s-0034-1376812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Nuñez E, Isla P, Olivé M, Pascual A, Saulό A, Sastre S, Lozano L, Segur J, Nuñez M. AB1079 Total Knee Replacement from the Patient's Perspective. A Qualitative Study. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Velazquez J, Pascual A, Vidal N, Rodriguez P. Surgical Experience of Emergent Cricothyrodotomies and Timeframe for Tracheostomy Conversion in the Puerto Rico Trauma Center. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pomba C, López-Cerero L, Bellido M, Serrano L, Belas A, Couto N, Cavaco-Silva P, Rodríguez-Baño J, Pascual A. Within-lineage variability of ST131 Escherichia coli isolates from humans and companion animals in the south of Europe. J Antimicrob Chemother 2013; 69:271-3. [PMID: 24022069 DOI: 10.1093/jac/dkt343] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Orlandini A, Castellana N, Pascual A, Botto F, Bahit C, Chacon C, Diaz R. Usefulness of myocardial viability tests in the decision making process to indicate revascularization in patients with left ventricular dysfunction and coronary artery disease. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Tourkmani W, Tisaire J, Rozas M, Tadeo G, Pascual A, Pastor C, Moreno C. Intraoperative electronic brachytherapy with Intrabeam® in breast cancer. A feasibility study. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Campos I, Alvarez JA, Villar P, Pascual A, Herrero L. Foundry sands as low-cost adsorbent material for Cr (VI) removal. ENVIRONMENTAL TECHNOLOGY 2013; 34:1267-1281. [PMID: 24191460 DOI: 10.1080/09593330.2012.745620] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The potential of foundry sands, industrial waste from the iron foundry industry, was evaluated for the removal of Cr (VI) using discontinuous assays. Chemical foundry sands are composed of fine silica sand, furanic resins as binder, chemical catalyst and residual iron particles. The influence ofpH, agitation rate and metal concentration on the removal process was investigated. Kinetic and equilibrium tests were conducted to determine Cr (VI) removal from aqueous solutions at a temperature range of 25-55 degrees C. Cr (VI) removal of 40-100% for a range of pH 6-1.6 was obtained. This removal was attributed to the presence of a large number of protonated silanol and aluminol groups. Cr (VI) adsorption in foundry sands follows a pseudo-second-order kinetic reaction (Ho model, r2 > 0.999) reaching kinetic constants of 0.341, 0.551, 0.775 and 0.920 g/mg h at 25, 35, 45 and 55 degrees C, respectively. The adsorption data were fitted to the Langmuir adsorption isotherm model (r > 0.99) obtaining adsorption capacities (q(max)) of 1.99, 2.40, 2.50, and 3.14 mg Cr (VI)/g sand at 25, 35, 45 and 55 degrees C, respectively. Calculated Gibbs free energy change (deltaG0), adsorption energy (E) and activation energy (E(a)) values indicate that a physisorption mechanism governs Cr (VI) adsorption process in foundry sands.
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