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Ruiz LM, Checa A, Perez JI, Torre-Marín JM, Muñoz-Ubiña A, Gómez MA. Effect of FeCl 3 concentration in chemically enhanced primary treatment on the performance of a conventional wastewater treatment plant. A case study. J Environ Sci Health A Tox Hazard Subst Environ Eng 2024; 59:33-39. [PMID: 38475980 DOI: 10.1080/10934529.2024.2328449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 02/29/2024] [Indexed: 03/14/2024]
Abstract
The effect of coagulant dosage in a chemically enhanced primary treatment (CEPT) on the performance of a conventional wastewater treatment plant (WWTP) has been investigated. Lab-scale experiments simulations were carried out in order to evaluate the effect of coagulant addition on the primary settling performance. In these experiments, FeCl3 was used as coagulant. Later, the WWTP was theoretically simulated using a commercial software (WEST®) to evaluate the effect of coagulation/flocculation on the global system, based on the results obtained at lab-scale. According to these results, the CEPT modifies the organic matter balance in the WWTP, decreasing the contribution of readily (SS) and slowly (XS) biodegradable fractions of COD to the aerobic biological process up to 27.3% and 80.8%, respectively, for a dosage of FeCl3 of 24 mg L-1. Consequently, total suspended solids in the aerobic reactor and the secondary purged sludge decreased up to 33% and 13%, respectively. However, the influence on effluent quality was negligible. On the contrary, suspended solids concentration in the sludge to be treated by anaerobic digestion increased, mainly regarding the Ss and Xs fractions, which caused an 8.1% increase in biogas production potential, with approximately 60% of CH4 concentration.
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Affiliation(s)
- L M Ruiz
- Technologies for Water Management and Treatment Research Group, University of Granada, Spain
| | - A Checa
- Technologies for Water Management and Treatment Research Group, University of Granada, Spain
| | - J I Perez
- Technologies for Water Management and Treatment Research Group, University of Granada, Spain
| | | | - A Muñoz-Ubiña
- EMASAGRA, Municipal Water Treatment Company, Granada, Spain
| | - M A Gómez
- Technologies for Water Management and Treatment Research Group, University of Granada, Spain
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Membrillo de Novales FJ, Bravo de Pablo O, Estella García Á, Morata Ruiz L, Oltra Sempere MR, Salavert Lleti M, Estébanez Muñoz M, Hidalgo-Tenorio C. The positioning of ceftobiprole in Staphylococcus aureus bacteremia. Clin Infect Dis 2024:ciae123. [PMID: 38466267 DOI: 10.1093/cid/ciae123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/10/2024] [Accepted: 03/04/2024] [Indexed: 03/12/2024] Open
Affiliation(s)
- Francisco Javier Membrillo de Novales
- CBRN and Infectious Diseases Department. Hospital Central de la Defensa "Gómez Ulla". Madrid, Spain
- Internal Medicine Department. Hospital La Moraleja. Madrid, Spain
| | | | - Ángel Estella García
- Intensive Care Department. University of Cádiz, INIBiCA.Hospital Universitario de Jerez. Jerez, Spain
| | | | | | | | - Miriam Estébanez Muñoz
- CBRN and Infectious Diseases Department. Hospital Central de la Defensa "Gómez Ulla". Madrid, Spain
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Morata Ruiz L, Ruggieri A, Falcone M, Pasquau Liaño J, Gentile I, Salavert Lletí M, Moreno Núñez L, Cascio A, Tascini C, Loeches Yagüe M, De Rosa FG, Ori A, Comandini A, Cattaneo A, Grossi PA. Dalbavancin real-life utilization among diabetic patients suffering from infections in Italy and Spain: The DALBADIA retrospective cohort study. J Glob Antimicrob Resist 2024; 36:200-209. [PMID: 38211660 DOI: 10.1016/j.jgar.2023.11.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 11/14/2023] [Accepted: 11/29/2023] [Indexed: 01/13/2024] Open
Abstract
OBJECTIVES To retrospectively describe the patterns of use of dalbavancin for treating infections in diabetic patients in Italian and Spanish standard clinical practice. METHODS DALBADIA [NCT04959799] was a multicentre, observational, retrospective cohort study, conducted in Italy and Spain. The study enrolled 97 adults with type 1 or 2 diabetes mellitus, treated with dalbavancin as per standard clinical practice for a Gram-positive bacterial infection or the Gram-positive component of a mixed infection. RESULTS Dalbavancin was used to treat cellulitis (18/92 patients, 19.6%), followed by prosthetic joint infection (14 patients, 15.2%), endocarditis (13 patients, 14.1%), and primary bacteraemia (10 patients, 10.9%); 78/92 (84.8%) patients had Gram-positive infections only, and 14 (15.2%) had mixed infections. The most frequently isolated microorganisms were Staphylococcus aureus in 43 (55.8% of the patients with microbial isolation), 25.6% of which methicillin-resistant; Staphylococcus epidermidis in 13 (16.9%), 53.8% of which methicillin-resistant; Enterococcus faecalis in 11 (14.3%). The main reason for the dalbavancin choice was the intent to simplify the antibiotic regimen (81.5% of cases). A multidisciplinary team participated in the treatment choice process for 53 (57.6%) patients. Dalbavancin was given as first-line antibiotic in 34 (37.0%) patients and administered as one infusion in 32 (34.8%), and as two infusions in 39 (42.4%). In total, 57/62 (91.9%) eligible patients with available assessment were judged clinically cured or improved at the end of observation. CONCLUSION In clinical practice, dalbavancin was used in diabetic patients to treat ABSSSIs and other difficult-to-treat infections with a favourable safety profile and a high rate of positive clinical responses.
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Affiliation(s)
- Laura Morata Ruiz
- Hospital Clìnic, Department of Infectious Diseases, University of Barcelona, Barcelona, Spain
| | | | - Marco Falcone
- AOU Pisana PO Cisanello, UO Malattie Infettive, University of Pisa, Pisa, Italy
| | - Juan Pasquau Liaño
- Hospital Universitario Virgen de las Nieve, Unidad de Enfermedades Infecciosas, Granada, Spain
| | - Ivan Gentile
- AOU Federico II, Malattie Infettive, Patologia Clinica e Medicina Interna, Università di Napoli Federico II, Naples, Italy
| | - Miguel Salavert Lletí
- Hospital Universitario y Politécnico La Fe, Unidad de Enfermedades Infecciosas, Valencia, Spain
| | - Leonor Moreno Núñez
- Hospital Universitario Fundación Alcorcón, Enfermedades Infecciosas, Madrid, Spain
| | - Antonio Cascio
- AOU Policlinico Giaccone, UOC Malattie Infettive e Tropicali, Palermo, Italy
| | | | | | - Francesco Giuseppe De Rosa
- Ospedale Cardinal Massaia, SC Malattie Infettive, Asti, Italy, AOU Città della Salute e Scienza, Presidio Molinette, Turin, Italy
| | | | | | | | - Paolo Antonio Grossi
- ASST Sette Laghi, SC Malattie Infettive e Tropicali, University of Insubria, Varese, Italy
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Barbero Allende JM, Gómez-Junyent J, Sorlí Redó L, Rodríguez-Pardo D, Murillo Rubio Ó, Fernández Sampedro M, Escudero-Sánchez R, García Gutiérrez M, Portillo ME, Sancho I, Rico Nieto A, Guio Carrión L, Soriano A, Morata Ruiz L. Description of reinfection of joint prosthesis after 2-stage replacement (infection of the 2nd stage prosthesis): A multicenter study. Enferm Infecc Microbiol Clin (Engl Ed) 2023:S2529-993X(23)00196-X. [PMID: 37479562 DOI: 10.1016/j.eimce.2023.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 05/10/2023] [Indexed: 07/23/2023]
Abstract
INTRODUCTION Two-stage exchange is the gold standard in the surgical management of prosthetic joint infection (PJI). However, perioperative reinfections (RePJI) can occur to newly inserted prosthesis, which highlights the importance of an adequate antibiotic prophylaxis, although there is scarce evidence in this field. Our objective was to evaluate the characteristics of RePJI, its prognosis and the antibiotic prophylaxis that is commonly used in second-stage surgery. METHODS Multicentric retrospective observational study in Spanish hospitals including patients with RePJI between 2009 and 2018. RESULTS We included 92 patients with RePJI from 12 hospitals. The most frequent isolated microorganism was Staphylococcus epidermidis in 35 cases (38.5%); 61.1% of staphylococci were methiciliin-resistant. In 12 cases (13%), the same microoganism causing the primary PJI was isolated in RePJI. When comparing with the microbiology of primary PJI, there were more cases caused by Gram-negative bacteria (the most frequent was Pseudomonas spp.) and less by Gram-positive bacteria. Failure occured in 69 cases (75%). There were 43 different courses of antibiotic prophylaxis after the second-stage surgery; the most frequent was a unique preoperative cefazolin dose, but most patients received prophylaxis before and after the second-stage surgery (61 cases). CONCLUSIONS The most frequent microorganisms in RePJI are coagulase-negative staphylococci, although Gram-negative bacteria, especially Pseudomonas spp. are also common. There is a significant heterogeneity in antibiotic prophylaxis for a second-stage surgery. ReIPJI treatment has a high failure rate.
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Affiliation(s)
- José M Barbero Allende
- Servicio de Medicina Interna, Hospital Príncipe de Asturias, Alcalá de Henares, Madrid, Spain; Universidad de Alcalá, Alcalá de Henares, Madrid, Spain; Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC).
| | - Joan Gómez-Junyent
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); Servicio de Enfermedades Infecciosas, Hospital del Mar, Barcelona, Spain; Infectious Pathology and Antimicrobial Research Group (IPAR); Universidad Autónoma de Barcelona (UAB), Barcelona, Spain; CEXS-Universitat Pompeu Fabra, Barcelona, Spain
| | - Lluisa Sorlí Redó
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); Servicio de Enfermedades Infecciosas, Hospital del Mar, Barcelona, Spain; Infectious Pathology and Antimicrobial Research Group (IPAR); CEXS-Universitat Pompeu Fabra, Barcelona, Spain
| | - Dolors Rodríguez-Pardo
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); Servicio de Enfermedades Infecciosas, Hospital Universitario Vall d'Hebron, Barcelona, Spain; CIBERINFEC, ISCIII-CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain
| | - Óscar Murillo Rubio
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); CIBERINFEC, ISCIII-CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain; Servicio de Enfermedades Infecciosas, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain; IDIBELL, Universitat de Barcelona, Barcelona, Spain; Universidad de Barcelona, Barcelona, Spain
| | - Marta Fernández Sampedro
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); CIBERINFEC, ISCIII-CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain; Servicio de Enfermedades Infeciosas, Hospital Universitario Marqués de Valdecilla-IDIVAL, Santander, Cantabria, Spain
| | - Rosa Escudero-Sánchez
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); CIBERINFEC, ISCIII-CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain; Servicio Enfermedades Infecciosas, Hospital Universitario Ramón y Cajal, Madrid, Spain; Instituto Ramón y Cajal de Investigación Sanitaria, Madrid, Spain
| | - Manuel García Gutiérrez
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); CIBERINFEC, ISCIII-CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain; Unidad de Enfermedades Infecciosas y Microbiologia Clínica, Hospital Universitario Virgen del Rocío, Sevilla, Spain
| | - M Eugenia Portillo
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); Servicio de Microbiología Clínica, Hospital Universitario de Navarra, Pamplona, Navarra, Spain; Institute of Healthcare Research of Navarra (IdiSNA), Pamplona, Navarra, Spain
| | - Ignacio Sancho
- Servicio de Cirugía Ortopédica y Traumatología, Hospital Universitario de Navarra, Pamplona, Navarra, Spain
| | - Alicia Rico Nieto
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); CIBERINFEC, ISCIII-CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain; Unidad de Enfermedades Infecciosas y Microbiologia Clínica, Hospital Universitario La Paz, Madrid, Spain
| | - Laura Guio Carrión
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); Servicio de Enfermedades Infecciosas, Hospital Universitario Cruces, Barakaldo, Bizkaia, Spain; Biocruces Bizkaia Health Research Institute, Barakaldo, Bizkaia, Spain
| | - Alex Soriano
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); CIBERINFEC, ISCIII-CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Madrid, Spain; Universidad de Barcelona, Barcelona, Spain; Servicio de Enfermedades Infecciosas, Hospital Clínic de Barcelona «IDIBAPS», Barcelona, Spain
| | - Laura Morata Ruiz
- Grupo de Estudio de Infección Osteoarticular de la Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (GEIO-SEIMC); Universidad de Barcelona, Barcelona, Spain; Servicio de Enfermedades Infecciosas, Hospital Clínic de Barcelona «IDIBAPS», Barcelona, Spain
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Ruiz LM, Perez JI, Gómez A, Letona A, Gómez MA. Ultrasonic irradiation for ultrafiltration membrane cleaning in MBR systems: operational conditions and consequences. Water Sci Technol 2017; 75:802-812. [PMID: 28234281 DOI: 10.2166/wst.2016.566] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Ultrasonic irradiation is one of the most promising membrane cleaning techniques for membrane bioreactors (MBRs) because of several advantages such as high flux-recovery capacity and in situ application without interrupting the filtration process. However, significant contradictions may be found and, consequently, this method has not yet been widely developed. In this paper, four MBRs equipped with hollow-fibre polyvinylidene fluoride ultrafiltration membranes were operated continuously. The cleaning method applied consisted of sonication at low power (15 W) with different frequencies (20, 25, 30, and 40 kHz) for each module and aerated backwashing. The different MBRs were analysed comparatively between them and with a conventional MBR in order to check the effects of the irradiated waves on membrane integrity, effluent quality and process performance. Effluent turbidity and chemical oxygen demand, total and volatile suspended solid concentration and activated sludge viscosity were affected by biomass fragmentation or membrane cake removal, mainly at lower frequencies. The best transmembrane pressure control was achieved at the frequency of 20 kHz without a significant effect on membrane integrity. The results showed that under these operational conditions, no negative effects on effluent quality or membrane integrity were found, suggesting that this method was suitable for this type of membrane.
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Affiliation(s)
- L M Ruiz
- Technologies for Water Management and Treatment Research Group, University of Granada, Campus de Fuentenueva s/n 18071, Granada, Spain E-mail:
| | - J I Perez
- Technologies for Water Management and Treatment Research Group, University of Granada, Campus de Fuentenueva s/n 18071, Granada, Spain E-mail:
| | - A Gómez
- Department of Research and Development, Cadagua S.A., Gran Via 45, 7ª, Bilbao 48011, Spain
| | - A Letona
- Department of Research and Development, Cadagua S.A., Gran Via 45, 7ª, Bilbao 48011, Spain
| | - M A Gómez
- Technologies for Water Management and Treatment Research Group, University of Granada, Campus de Fuentenueva s/n 18071, Granada, Spain E-mail:
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Ruiz LM, Rodelas P, Pérez JI, Gómez MA. Sensitivity analyses and simulations of a full-scale experimental membrane bioreactor system using the activated sludge model No. 3 (ASM3). J Environ Sci Health A Tox Hazard Subst Environ Eng 2015; 50:317-324. [PMID: 25594125 DOI: 10.1080/10934529.2015.981122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An ASM3-based model was implemented in the numerical software MATHEMATICA where sensitivity analyses and simulations of a membrane bioreactor (MBR) system were carried out. These results were compared with those obtained using the commercial simulator WEST. Predicted values did not show significant variations between both software and simulations showed that the most influential operational conditions were influent flow rate and concentrations and bioreactor volumes. On the other hand, sensitivity analyses were carried out with both software programs for the same five outputs: COD, ammonium and nitrate concentrations in the effluent, total suspended solids concentration and oxygen uptake rate in the aerobic bioreactor. Similar results were in general obtained in both cases and according to these analyses, the most significant inputs over the model predictions were growth and storage heterotrophic biomass yields and decay coefficient. Other parameters related to the hydrolysis process or to the autotrophic biomass also significantly influenced model outputs.
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Affiliation(s)
- L M Ruiz
- a Technologies for Water Management and Treatment Research Group , University of Granada , Granada , Spain
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Nepomuceno NA, Samano MS, Braga KAO, Ruiz LM, Pato EZS, Hirata BKS, Pêgo-Fernandes PM, Jatene FB. Experimental model of lung donors with hemorrhagic shock treated with hypertonic saline solution and ex-vivo evaluation with lung perfusion system. J Cardiothorac Surg 2013. [PMCID: PMC3845507 DOI: 10.1186/1749-8090-8-s1-o237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- NA Nepomuceno
- Thoracic Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - MS Samano
- Thoracic Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - KAO Braga
- Thoracic Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - LM Ruiz
- Thoracic Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - EZS Pato
- Thoracic Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - BKS Hirata
- Thoracic Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - PM Pêgo-Fernandes
- Thoracic Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - FB Jatene
- Cardiovascular Surgery Department, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
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Ruiz LM, Castro M, Barriga A, Jerez CA, Guiliani N. The extremophile Acidithiobacillus ferrooxidans possesses a c-di-GMP signalling pathway that could play a significant role during bioleaching of minerals. Lett Appl Microbiol 2011; 54:133-9. [PMID: 22098310 DOI: 10.1111/j.1472-765x.2011.03180.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS The primary goal of this study was to characterize the existence of a functional c-di-GMP pathway in the bioleaching bacterium Acidithiobacillus ferrooxidans. METHODS AND RESULTS A bioinformatic search revealed that the genome sequence of At. ferrooxidans ATCC 23270 codes for several proteins involved in the c-di-GMP pathway, including diguanylate cyclases (DGC), phosphodiesterases and PilZ effector proteins. Overexpression in Escherichia coli demonstrated that four At. ferrooxidans genes code for proteins containing GGDEF/EAL domains with functional DGC activity. MS/MS analysis allowed the identification of c-di-GMP in nucleotide preparations obtained from At. ferrooxidans cells. In addition, c-di-GMP levels in cells grown on the surface of solid energetic substrates such as sulfur prills or pyrite were higher than those measured in ferrous iron planktonic cells. CONCLUSIONS At. ferrooxidans possesses a functional c-di-GMP pathway that could play a key role in At. ferrooxidans biofilm formation during bioleaching processes. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first global study about the c-di-GMP pathway in an acidophilic bacterium of great interest for the biomining industry. It opens a new way to explore the regulation of biofilm formation by biomining micro-organisms during the bioleaching process.
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Affiliation(s)
- L M Ruiz
- Laboratorio de Comunicaciones Bacterianas, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
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Ruiz LM, Arévalo J, Parada J, González D, Moreno B, Pérez J, Gómez MA. Respirometric assays of two different MBR (microfiltration and ultrafiltration) to obtain kinetic and stoichiometric parameters. Water Sci Technol 2011; 63:2478-2485. [PMID: 22049738 DOI: 10.2166/wst.2011.578] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A comparison of two different medium scale MBRs (ultrafiltration and microfiltration) using respirometric methods has been achieved. The ultrafiltration membrane plant (0.034 microm pore size) maintained recirculation sludge flow at seven times the influent flow, and membranes were backwashed every 5 min and chemically cleaned weekly. The microfiltration membrane plant (0.4 microm pore size) maintained recirculation sludge flow at four times the influent flow, membrane-relax was applied after the production phase and membranes were chemically cleaned in the event of high trans-membrane pressure. Both technologies showed a similar performance with regard to heterotrophic kinetic and stoichiometric parameters and organic matter effluent concentrations. The influent was characterized by means of its COD fractions and the average removal percentages for COD concentrations were around 97% for both plants in spite of influent COD fluctuation, temperature variations and sludge retention time (SRT) evolution. Both SRT evolution and temperature affect the heterotrophic yield (Y(H)) and the decay coefficient (bH) in the same range for both plants. Y(H) values of over 0.8 mg COD/mg COD were obtained during the unsteady periods, while under steady state conditions these values fell to less than 0.4 mg COD/mg COD. bH by contrast reached values of less than 0.05 d(-1).
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Affiliation(s)
- L M Ruiz
- Department of Civil Engineering and Water Research Institute, University of Granada, Ramón y Cajal 4, P.C 18071, Granada, Spain.
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Sierra-Montes JM, Pereira-Simon S, Freund AV, Ruiz LM, Szmulewicz MN, Herrera RJ. A diversity of U1 small nuclear RNAs in the silk moth Bombyx mori. Insect Biochem Mol Biol 2003; 33:29-39. [PMID: 12459198 DOI: 10.1016/s0965-1748(02)00164-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Variants of U1 small nuclear RNAs (snRNAs) have been previously detected in a permanent cell line (BmN) of the silk moth Bombyx mori. In this study, the existence of U1 snRNA isoforms in the silk gland (SG) of the organism is investigated. The polyploidy (approximately 200,000X the 2N somatic value) state of the B. mori silk gland cells represents a unique system to explore the potential presence and differential expression of multiple U1 variants in a normal tissue. B. mori U1-specific RT-PCR libraries from the silk gland were generated and five U1 isoforms were isolated and characterized. Nucleotide differences, structural alterations, as well as protein and RNA interaction sites were examined in these variants and compared to the previously reported isoforms from the transformed BmN cell line. In all these SG U1 variants, variant sites and inter-species differences are located in moderately conserved regions. Substitutional or compensatory changes were found in the double stranded areas and clustered in moderately conserved regions. Some of the changes generate stronger base pairing. Calculated free energy (DeltaG) values for the entire U1 snRNA secondary structures and for the individual stem/loops (I, II, III and IV) domains of the isoforms were generated and compared to determine their structural stability. Using phylogenetic analysis, an evolutionary parallelism is observed between the polymorphic sites in B. mori and variant locations found among animal and plant species.
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Affiliation(s)
- J M Sierra-Montes
- Department of Biological Sciences, OE 304, Florida International University, Miami, FL 33199, USA
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Sierra-Montes JM, Freund AV, Ruiz LM, Szmulewicz MN, Rowold DJ, Herrera RJ. Multiple forms of U2 snRNA coexist in the silk moth Bombyx mori. Insect Mol Biol 2002; 11:105-114. [PMID: 11841508 DOI: 10.1046/j.0962-1075.2001.00313.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Eight U2 snRNA variants were isolated from several Bombyx mori U2-specific RT-PCR libraries. U2 sequences and secondary structures were generated and examined in terms of potential RNA and protein interactions. Analysis indicated that nucleotide changes occurred in both stem/loop and single-stranded areas. Changes in the double stranded areas were either compensatory, single substitutions (e.g. C <--> U) or prevented the double-stranded formation of one or two base pairs. The polymorphisms were clustered in moderately conserved regions. Some of the changes observed generated stronger base pairing. Inter-species conserved protein or RNA-binding sites were relatively unaffected. No polymorphic sites were found in known functional sequences. Bombyx mori and Drosophila melanogaster U2 sequences are 95% and 70% similar at the 5'- and the 3'-ends of the molecule, respectively. Phylogenetic analysis of the U2 sequences demonstrates remarkable conservation across species.
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Affiliation(s)
- J M Sierra-Montes
- Department of Biological Sciences, Florida International University, Miami, FL 33199, USA
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Sosa-Estani S, Segura EL, Gomez A, Salomón OD, Peralta M, Coutada V, Ruiz LM. [Cutaneous leishmaniasis in Northern Argentina: identification of risk factors in a case-cohort study of three municipalities in Salta]. Rev Soc Bras Med Trop 2001; 34:511-7. [PMID: 11813056 DOI: 10.1590/s0037-86822001000600003] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The objective of this work was evaluate risk factors for acquiring cutaneous leishmaniasis in Salta, the region with the greatest indices of transmission in Argentina. A Case-cohort study was realized from June 1989 to December 1992. The procedures performed on cases and controls included: a) socio-demographic questionnaire; b) domestic and peridomestic environment description; c) physical exam of skin and nasal and oral mucosal; d) Montenegro Skin Test. Multivariate analysis showed a significant risk for factors outside the home (cattle management, hunting, sleeping at the work place) and while at home (sleeping outside of the bedroom, presence of three or more pigs in the yard and windows that cannot be locked in the closed position). This association allowed the identification of risk factors linked to the transmission of leishmaniasis in the home for the first time in Salta (Argentina).
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Affiliation(s)
- S Sosa-Estani
- Centro Nacional de Diagnóstico e Investigación de Endemo-Epidemias, Buenos Aires, Argentina.
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Sosa-Estani S, Segura EL, Salomón OD, Gómez A, Peralta M, Coutada V, Ruiz LM. Tegumentary leishmaniasis in Northern Argentina: distribution of infection and disease, in three municipalities of Salta, 1990-1992. Rev Soc Bras Med Trop 2000; 33:573-82. [PMID: 11175588 DOI: 10.1590/s0037-86822000000600009] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This work describes the epidemiological pattern of tegumentary leishmaniasis in an area north of Salta, Argentina. The prevalence and incidence were estimated by means of a cross-sectional study and two follow-up studies during two consecutive years. The Montenegro Skin Test (MST) was administered to 7336 subjects at baseline. The prevalence and incidence between 1990 and 1992 of infection (MST reactive) was 38 per mil persons and 4.5 per mil persons/year respectively. The prevalence and incidence of tegumentary leishmaniasis (presence of clinical signs) was 1.8 per mil and 0.8 per mil persons/year, respectively. A physical examination performed on 264 patients with MST reactive during three years revealed that 130 cases (49.2%) had some evident sign of infection (scar and/or lesion), with a clinical presentation compatible with leishmaniasis. Our study demonstrated that after the epidemic outbreak of 1985 the transmission in the study area returned to endemic levels in 1992, and also demonstrated the presence of the asymptomatic infection in the area.
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Affiliation(s)
- S Sosa-Estani
- National Center of Diagnosis and Endemic and Epidemic Research, Av. Paseo Colón 568, 1063, Buenos Aires, Argentina.
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Calderón-Garcidueñas L, Delgado R, Calderón-Garcidueñas A, Meneses A, Ruiz LM, De La Garza J, Acuna H, Villarreal-Calderón A, Raab-Traub N, Devlin R. Malignant neoplasms of the nasal cavity and paranasal sinuses: a series of 256 patients in Mexico City and Monterrey. Is air pollution the missing link? Otolaryngol Head Neck Surg 2000; 122:499-508. [PMID: 10740168 DOI: 10.1067/mhn.2000.103080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Air pollution is a serious health problem in major cities in Mexico. The concentrations of monitored criteria pollutants have been above the US National Ambient Air Quality Standards for the last decade. To determine whether the number of primary malignant nasal and paranasal neoplasms has increased, we surveyed 256 such cases admitted to a major adult oncology hospital located in metropolitan Mexico City (MMC) for the period from 1976-1997 and to a tertiary hospital in Monterrey, an industrial city, for the period from 1993-1998. The clinical histories and histopathologic material were reviewed, and a brief clinical summary was written for each case. In the MMC hospital the number of newly diagnosed nasal and paranasal neoplasms per year for the period from 1976-1986 averaged 5.1, whereas for the next 11 years it increased to 12.5. The maximal increase was observed in 1995-1997, with an average of 20.3 new cases per year (P = 0.0006). The predominant neoplasms in these series were non-Hodgkin's lymphoma, squamous cell carcinoma, melanoma, adenocarcinoma, Schneiderian carcinoma, and nasopharyngeal carcinoma. In the Monterrey hospital a 2-fold increase in the numbers of newly diagnosed nasal and paranasal neoplasms was recorded between 1993 and 1998. The predominant MMC neoplasm in this series, namely nasal T-cell/natural killer cell non-Hodgkin's lymphoma, is potentially Epstein-Barr virus related. Nasal and paranasal malignant neoplasms are generally rare. Environmental causative factors include exposure in industries such as nickel refining, leather, and wood furniture manufacturing. Although epidemiologic studies have not addressed the relationship between outdoor air pollution and sinonasal malignant neoplasms, there is strong evidence for the nasal and paranasal carcinogenic effect of occupational aerosol complex chemical mixtures. General practitioners and ear, nose, and throat physicians working in highly polluted cities should be aware of the clinical presentations of these patients. Identification of this apparent increase in sinonasal malignant neoplasms in two urban Mexican polluted cities warrants further mechanistic and epidemiologic studies.
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Affiliation(s)
- L Calderón-Garcidueñas
- Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Ruiz LM, Montejo M, Benito JR, Aguirrebengoa K, Amenabar JJ, Barron J, Lampreabe I. Simultaneous pulmonary infection by Nocardia asteroides and Pneumocystis carinii in a renal transplant patient. Nephrol Dial Transplant 1996; 11:711-4. [PMID: 8671868 DOI: 10.1093/oxfordjournals.ndt.a027369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- L M Ruiz
- Nephrology Service, Hospital de Cruces, Bilbao (Vizcaya), Spain
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Gainza FJ, Minguela I, Lopez-Vidaur I, Ruiz LM, Lampreabe I. Evaluation of complications due to percutaneous renal biopsy in allografts and native kidneys with color-coded Doppler sonography. Clin Nephrol 1995; 43:303-8. [PMID: 7634544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We studied 142 consecutive percutaneous renal biopsies (puncturing on 73 allografts and 69 native kidneys) which were performed under continuous ultrasonic guidance, on 133 adult patients. The patients were monitored, at least, during the next 24 hours. We compared the complication rate for biopsies recording clinical and biochemical data and, the day after the biopsy, the kidney was examined with a color-coded Doppler sonography (CCDS): in real-time survey of the kidney and with spectral wave form analysis. The diagnosis of arteriovenous (AV) fistula was achieved detecting increased color saturation toward white, high peak systolic flow velocity and low resistive index in the supplying artery. Three procedures were excluded of the analyses because of incomplete data recorded, although none of them showed any remarkable complication. There was a 94.3% rate of successful biopsies. The mean +/- SEM number of glomeruli under light microscopic examination was 8.5 +/- 0.6. Complications occurred 64 times in relation to 55 patients with a higher incidence in allografts (61%) than in native kidneys (31%). Renal transplant patients showed higher serum creatinine values (5.8 +/- 0.8 vs. 3.2 +/- 0.4; p > 0.0001) and lower hematocrit (31.3 +/- 1.1 vs. 34.4 +/- 0.9; p = 0.025) than the native-kidney patients at the time of biopsy. De novo hematuria occurred in 30% of the procedures. In transplant patients, the gross hematuria incidence (9.9%) more than doubled that showed by native-kidney patients. The incidence of serious complications (hematoma, hemoperitoneum and AV fistula) was 16.5% and these were more frequent in transplant than in native kidneys.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- F J Gainza
- Department of Nephrology, Hospital de Cruces, Baracaldo/Vizcaya, Spain
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López MC, Ruiz LM, Craciunescu D, Doadrio A, Osuna A, Alonso C. Studies on the interaction between antitrypanosome cis-DDP analogs with DNA. Chem Biol Interact 1986; 59:99-111. [PMID: 3757148 DOI: 10.1016/s0009-2797(86)80057-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The nature of the conformational changes produced in DNA by cis-DDP analogs has been studied by physiochemical techniques. The UV spectra showed that the DNA undergoes bathochromic shifts accompanied by hyperchromic effects in reaction with specific analogs (cis-Pt(DDH) (mucobromic)2, cis-Pt(tranilcypromine)2Cl2 and cis-Pt(DDH) Cl2), while a different series of analogs (cis-Pt(DDH) (metafluorobenzoic)2 and cis-Pt(pentamidine)Cl2) induce a significative decrease in the absorbance at 258 nm. Moreover one of these analogs (cis-Pt(pentamidine)Cl2) causes strong stabilization of the double helix to heat denaturation. The CD spectra indicate moreover that cis-Pt(pentamidine)Cl2 modifies the secondary structure of the DNA in a significant way with an increase of the positive band and a decrease of the ellipticity of the negative band. The antitrypanosome activity of cis-Pt(pentamidine)Cl2 is probably due to inhibition of the intracellular parasites division in parasitized cells.
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Camilo-Alves A, de Sousa MDF, Ruiz LM, da Silva LN, Toscano M, Mendonça N, Galvão-Teles A. [Trial study on the growth of male individuals (9-17 years). II. Pubertal development]. ACTA MEDICA PORT 1981; 3:99-112. [PMID: 6976069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Alves AC, de Sousa MF, Ruiz LM, da Silva LN, Toscano M, Belo NM. [Pilot studies on the growth of individuals of the male sex (9-17 years old). II. Skinfold thickness]. ACTA MEDICA PORT 1980; 2:359-67. [PMID: 7293812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Alves AC, de Sousa MD, Ruiz LM, da Silva LN, Toscano M, Belo NM. [A pilot study on the growth of a male population (9-17 years old, I]. ACTA MEDICA PORT 1980; 2:89-105. [PMID: 7435235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Kutscher AH, Zegarelli EV, Ruiz LM, Miller B, Bonfield C. Long-lasting lozenge: dissolution duration time in the clinic in patients with oral mucosal lesions. J Conn State Dent Assoc 1969; 43:113. [PMID: 4976518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Kutscher AH, Zegarelli EV, Ruiz LM, Mija C, Bonfield C, Robinson G, Seidman M. Long-lasting lozenges: effect of cold fluids on dissolution time in the mouth. Ann Dent 1969; 28:8-9. [PMID: 5251362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Kutscher AH, Zegarelli EV, Ruiz LM, Schoenfeld M, Goldstein J. Long-lasting lozenge: effect of dissolution site on dissolution time. J Conn State Dent Assoc 1969; 43:52-3. [PMID: 4975085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Kutscher AH, Zegarelli EV, Ruiz LM, McAdams W, Baker N, Robinson G. Long-lasting lozenges CU 701-1: dissolution duration times in patients with oral mucosal lesions. Ann Dent 1968; 27:149-50. [PMID: 4886473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Kutscher AH, Zegarelli EV, Ruiz LM, Betaque N, Henry T. Action of benzocaine long-lasting lozenge. J Oral Med 1968; 23:132-3. [PMID: 4886137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Ruiz LM. [Role of colpocytology in the prenatal diagnosis of placenal senescence]. Rev Clin Inst Matern Lisb 1967; 18:13-9. [PMID: 5632464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Ruiz LM. Vaginal cytology during delivery. Acta Cytol 1965; 9:337-9. [PMID: 5214049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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