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Arias D, Saldaña M, Botero YL, Dinamarca F, Paredes B, Salazar-Ardiles C, Andrade DC, Cisternas LA, Carrasco J, Santos C, Dorador C, Gómez-Silva B. Exploring the potential of the halotolerant bacterial strain Bacillus subtilis LN8B as an ecofriendly sulfide collector for seawater flotation. J Appl Microbiol 2024; 135:lxad313. [PMID: 38126104 DOI: 10.1093/jambio/lxad313] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/12/2023] [Accepted: 12/19/2023] [Indexed: 12/23/2023]
Abstract
AIM To assess the effectiveness of Bacillus subtilis strain LN8B as a biocollector for recovering pyrite (Py) and chalcopyrite (CPy) in both seawater (Sw) and deionized water (Dw), and to explore the underlying adhesion mechanism in these bioflotation experiments. MATERIALS AND METHODS The bioflotation test utilized B. subtilis strain LN8B as the biocollector through microflotation experiments. Additionally, frother methyl isobutyl carbinol (MIBC) and conventional collector potassium amyl xanthate (PAX) were introduced in some experiments. The zeta potential (ZP) and Fourier-transform infrared spectroscopy (FTIR) was employed to explore the adhesion mechanism of Py and CPy interacting with the biocollector in Sw and Dw. The adaptability of the B. subtilis strain to different water types and salinities was assessed through growth curves measuring optical density. Finally, antibiotic susceptibility tests were conducted to evaluate potential risks of the biocollector. RESULTS Superior outcomes were observed in Sw where Py and CPy recovery was ∼39.3% ± 7.7% and 41.1% ± 5.8%, respectively, without microorganisms' presence. However, B. subtilis LN8B potentiate Py and CPy recovery, reaching 72.8% ± 4.9% and 84.6% ± 1.5%, respectively. When MIBC was added, only the Py recovery was improved (89.4% ± 3.6%), depicting an adverse effect for CPy (81.8% ± 1.1%). ZP measurements indicated increased mineral surface hydrophobicity when Py and CPy interacted with the biocollector in both Sw and Dw. FTIR revealed the presence of protein-related amide peaks, highlighting the hydrophobic nature of the bacterium. The adaptability of this strain to diverse water types and salinities was assessed, demonstrating remarkable growth versatility. Antibiotic susceptibility tests indicated that B. subtilis LN8B was susceptible to 23 of the 25 antibiotics examined, suggesting it poses minimal environmental risks. CONCLUSIONS The study substantiates the biotechnological promise of B. subtilis strain LN8B as an efficient sulfide collector for promoting cleaner mineral production. This effectiveness is attributed to its ability to induce mineral surface hydrophobicity, a result of the distinct characteristics of proteins within its cell wall.
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Affiliation(s)
- Dayana Arias
- Laboratory of Molecular Biology and Applied Microbiology, Research Center in High Altitude Medicine and Physiology, Biomedical Department, Faculty of Health Science, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Manuel Saldaña
- Faculty of Engineering and Architecture, Arturo Prat University, Iquique 1110939, Chile
| | - Yesica L Botero
- Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Francisco Dinamarca
- Biochemistry Lab., Biomedical Dept., Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Bernardo Paredes
- Biochemistry Lab., Biomedical Dept., Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Camila Salazar-Ardiles
- Laboratory of Molecular Biology and Applied Microbiology, Research Center in High Altitude Medicine and Physiology, Biomedical Department, Faculty of Health Science, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - David C Andrade
- Exercise Applied Physiology Laboratory, Research Center in High Altitude Medicine and Physiology, Biomedical Department, Faculty of Health Science, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Luis A Cisternas
- Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Jorge Carrasco
- Departamento de Ingeniería en Minas, Facultad de Ingeniería, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Carlos Santos
- Departamento de Ingeniería en Minas, Facultad de Ingeniería, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Cristina Dorador
- Department of Biotechnology, Faculty of Marine Sciences and Biological Resources and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Benito Gómez-Silva
- Biochemistry Lab., Biomedical Dept., Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
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Flores N, Hoyos S, Venegas M, Galetović A, Zúñiga LM, Fábrega F, Paredes B, Salazar-Ardiles C, Vilo C, Ascaso C, Wierzchos J, Souza-Egipsy V, Araya JE, Batista-García RA, Gómez-Silva B. Haloterrigena sp. Strain SGH1, a Bacterioruberin-Rich, Perchlorate-Tolerant Halophilic Archaeon Isolated From Halite Microbial Communities, Atacama Desert, Chile. Front Microbiol 2020; 11:324. [PMID: 32194531 PMCID: PMC7066086 DOI: 10.3389/fmicb.2020.00324] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 02/14/2020] [Indexed: 11/16/2022] Open
Abstract
An extreme halophilic archaeon, strain SGH1, is a novel microorganism isolated from endolithic microbial communities colonizing halites at Salar Grande, Atacama Desert, in northern Chile. Our study provides structural, biochemical, genomic, and physiological information on this new isolate living at the edge of the physical and chemical extremes at the Atacama Desert. SGH1 is a Gram-negative, red-pigmented, non-motile unicellular coccoid organism. Under the transmission electron microscope, strain SGH1 showed an abundant electro-dense material surrounding electron-lucent globular structures resembling gas vacuoles. Strain SGH1 showed a 16S rRNA gene sequence with a close phylogenetic relationship to the extreme halophilic archaea Haloterrigena turkmenica and Haloterrigena salina and has been denominated Haloterrigena sp. strain SGH1. Strain SGH1 grew at 20-40°C (optimum 37°C), at salinities between 15 and 30% (w/v) NaCl (optimum 25%) and growth was improved by addition of 50 mM KCl and 0.5% w/v casamino acids. Growth was severely restricted at salinities below 15% NaCl and cell lysis is avoided at a minimal 10% NaCl. Maximal concentrations of magnesium chloride and sodium or magnesium perchlorates that supported SGH1 growth were 0.5 and 0.15M, respectively. Haloterrigena sp. strain SGH1 accumulates bacterioruberin (BR), a C50 xanthophyll, as the major carotenoid. Total carotenoids in strain SGH1 amounted to nearly 400 μg BR per gram of dry biomass. Nearly 80% of total carotenoids accumulated as geometric isomers of BR: all-trans-BR (50%), 5-cis-BR (15%), 9-cis-BR (10%), 13-cis-BR (4%); other carotenoids were dehydrated derivatives of BR. Carotenogenesis in SGH1 was a reversible and salt-dependent process; transferring BR-rich cells grown in 25% (w/v) NaCl to 15% (w/v) NaCl medium resulted in depigmentation, and BR content was recovered after transference and growth of unpigmented cells to high salinity medium. Methanol extracts and purified BR isomers showed an 8-9-fold higher antioxidant activity than Trolox or β-carotene. Both, plasma membrane integrity and mitochondrial membrane potential measurements under acute 18-h assays showed that purified BR isomers were non-toxic to cultured human THP-1 cells.
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Affiliation(s)
- Nataly Flores
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Sebastián Hoyos
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Mauricio Venegas
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Alexandra Galetović
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Lidia M. Zúñiga
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Francisca Fábrega
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Bernardo Paredes
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Camila Salazar-Ardiles
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Claudia Vilo
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Carmen Ascaso
- Department Biogeochemistry and Microbial Ecology, National Museum of Natural Sciences – Spanish National Research Council, Madrid, Spain
| | - Jacek Wierzchos
- Department Biogeochemistry and Microbial Ecology, National Museum of Natural Sciences – Spanish National Research Council, Madrid, Spain
| | - Virginia Souza-Egipsy
- Department of Macromolecular Physics, Institute of Material Structure – Spanish National Research Council, Madrid, Spain
| | - Jorge E. Araya
- Laboratory of Molecular Parasitology, Department of Medical Technology and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
| | - Ramón Alberto Batista-García
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Benito Gómez-Silva
- Laboratory of Biochemistry, Biomedical Department and Centre for Biotechnology and Bioengineering, Universidad de Antofagasta, Antofagasta, Chile
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Llamas‐Velasco M, Held L, Gold R, Paredes B. Dermoscopy of primary cutaneous intravascular large B‐cell lymphoma. Clin Exp Dermatol 2019; 45:269-272. [DOI: 10.1111/ced.14073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/13/2019] [Indexed: 12/22/2022]
Affiliation(s)
- M. Llamas‐Velasco
- Department of Dermatology Hospital Universitario La Princesa Madrid Spain
| | - L. Held
- Department of Dermatopathology Friedrichshafen Dermatopathologie Friedrichshafen Germany
| | - R. Gold
- Department of Dermatology Ueberlingen Private Practice Ueberlingen Germany
| | - B. Paredes
- Department of Dermatopathology Friedrichshafen Dermatopathologie Friedrichshafen Germany
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Paredes B, De Miguel E, Bonilla G, Pieren A, Plasencia C, Monjo I, Pieren A, Moral E, Tornero C, Rosell A, Ruiz-Bravo E, Martin-Mola E, Balsa A, De Miguel E. AB0936 Usefulness of Salivary Glands Ultrasonography in The Diagnosis of Sjögren Syndrome. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Paredes B, Plasencia C, Balsa A, Monjo I, Plasencia C, Pascual-Salcedo D, Monjo I, Pieren A, Moral E, Tornero C, Bogas P, Bonilla G, Nuño L, Villalba A, Peiteado D, Ramiro S, Jurado T, Díez J, Martin-Mola E, Balsa A. AB0302 Influence of Tapering Biological Therapies in Immunogenicity in A Cohort of Rheumatoid Arthritis with Low Disease Activity. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Monjo Henry I, Plasencia C, Navarro-Compán V, Paredes B, Bonilla G, Nuño L, Peiteado D, Villalba A, Pascual-Salcedo D, Ramiro S, de Miguel E, Martín-Mola E, Balsa A. AB0660 Predictors of Flare after Tapering Anti-TNF Therapy in Patients with Axial Spondyloarthritis:. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Paredes B, Plasencia C, Pascual-Salcedo D, Monjo I, Pieren A, Moral E, Tornero C, Bonilla G, Nuño L, Villalba A, Peiteado D, Ramiro S, Jurado T, Díez J, Martin-Mola E, Balsa A. FRI0106 Influence of Optimization of Biological Therapies on Immunogenicity in a Cohort of Rheumatoid Arthritis with Low Disease Activity. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Monjo Henry I, Plasencia C, Pascual-Salcedo D, Paredes B, Pieren A, Tornero C, Moral E, Bonilla G, Nuño L, Peiteado D, Villalba A, Jurado T, Diego C, Díez J, Martin Mola E, Balsa A. THU0206 Influence of the Tapering Strategy TNF Inhibitors on the Immunogenicity in a Cohort of Spondyloarthritis Patients in Low Disease Activity. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Martínez-Pérez R, Paredes I, Munarriz PM, Paredes B, Alén JF. Chronic traumatic encephalopathy: The unknown disease. Neurologia 2014; 32:185-191. [PMID: 25534950 DOI: 10.1016/j.nrl.2014.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 02/11/2014] [Revised: 06/06/2014] [Accepted: 08/08/2014] [Indexed: 11/18/2022] Open
Abstract
Chronic traumatic encephalopathy is a neurodegenerative disease produced by accumulated minor traumatic brain injuries; no definitive premortem diagnosis and no treatments are available for chronic traumatic encephalopathy. Risk factors associated with chronic traumatic encephalopathy include playing contact sports, presence of the apolipoprotein E4, and old age. Although it shares certain histopathological findings with Alzheimer disease, chronic traumatic encephalopathy has a more specific presentation (hyperphosphorylated tau protein deposited as neurofibrillary tangles, associated with neuropil threads and sometimes with beta-amyloid plaques). Its clinical presentation is insidious; patients show mild cognitive and emotional symptoms before progressing to parkinsonian motor signs and finally dementia. Results from new experimental diagnostic tools are promising, but these tools are not yet available. The mainstay of managing this disease is prevention and early detection of its first symptoms.
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Affiliation(s)
- R Martínez-Pérez
- Servicio de Neurocirugía, Hospital 12 de Octubre, Madrid, España; Facultad de Medicina, Universidad Complutense, Madrid, España.
| | - I Paredes
- Servicio de Neurocirugía, Hospital Virgen de la Salud, Toledo, España
| | - P M Munarriz
- Servicio de Neurocirugía, Hospital 12 de Octubre, Madrid, España; Facultad de Medicina, Universidad Complutense, Madrid, España
| | - B Paredes
- Departamento de Psicología, Universidad Nacional de Educación a Distancia (UNED), España
| | - J F Alén
- Servicio de Neurocirugía, Hospital 12 de Octubre, Madrid, España; Facultad de Medicina, Universidad Complutense, Madrid, España
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Aidelsburger M, Atala M, Lohse M, Barreiro JT, Paredes B, Bloch I. Realization of the Hofstadter Hamiltonian with ultracold atoms in optical lattices. Phys Rev Lett 2013; 111:185301. [PMID: 24237530 DOI: 10.1103/physrevlett.111.185301] [Citation(s) in RCA: 231] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Indexed: 05/02/2023]
Abstract
We demonstrate the experimental implementation of an optical lattice that allows for the generation of large homogeneous and tunable artificial magnetic fields with ultracold atoms. Using laser-assisted tunneling in a tilted optical potential, we engineer spatially dependent complex tunneling amplitudes. Thereby, atoms hopping in the lattice accumulate a phase shift equivalent to the Aharonov-Bohm phase of charged particles in a magnetic field. We determine the local distribution of fluxes through the observation of cyclotron orbits of the atoms on lattice plaquettes, showing that the system is described by the Hofstadter model. Furthermore, we show that for two atomic spin states with opposite magnetic moments, our system naturally realizes the time-reversal-symmetric Hamiltonian underlying the quantum spin Hall effect; i.e., two different spin components experience opposite directions of the magnetic field.
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Affiliation(s)
- M Aidelsburger
- Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, Germany and Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany
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Casas E, Paredes B, Van Grieken R, Escola JM. (nBuCp)2ZrCl2 supported over mesoporous propyl sulfonic silica–alumina: a highly active heterogeneous catalyst for ethylene polymerization. Catal Sci Technol 2013. [DOI: 10.1039/c3cy00461a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Moya EL, Van Grieken R, Carrero A, Paredes B. Bimodal Poly(propylene) through Binary Metallocene Catalytic Systems as an Alternative to Melt Blending. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/masy.201251107] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Nascimbène S, Chen YA, Atala M, Aidelsburger M, Trotzky S, Paredes B, Bloch I. Experimental realization of plaquette resonating valence-bond states with ultracold atoms in optical superlattices. Phys Rev Lett 2012; 108:205301. [PMID: 23003151 DOI: 10.1103/physrevlett.108.205301] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Indexed: 06/01/2023]
Abstract
The concept of valence-bond resonance plays a fundamental role in the theory of the chemical bond and is believed to lie at the heart of many-body quantum physical phenomena. Here we show direct experimental evidence of a time-resolved valence-bond quantum resonance with ultracold bosonic atoms in an optical lattice. By means of a superlattice structure we create a three-dimensional array of independent four-site plaquettes, which we can fully control and manipulate in parallel. Moreover, we show how small-scale plaquette resonating valence-bond (RVB) states with s- and d-wave symmetry can be created and characterized. We anticipate our findings to open the path towards the creation and analysis of many-body RVB states in ultracold atomic gases.
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Affiliation(s)
- S Nascimbène
- Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, Germany
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Pin M, Laca A, Paredes B, Díaz M. Blue whiting surimi paste as affected by moisture content; temperature and pH processing conditions. Rheological evaluation. Acta Alimentaria 2010. [DOI: 10.1556/aalim.39.2010.4.6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Carrero A, van Grieken R, Paredes B. Ethylene polymerization with methylaluminoxane/(nBuCp)2ZrCl2 catalyst supported on silica and silica-alumina at different AlMAO/Zr molar ratios. J Appl Polym Sci 2010. [DOI: 10.1002/app.33189] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Carrero A, Van Grieken R, Suarez I, Paredes B. Ethylene polymerization over (nBuCp)2ZrCl2/MAO catalytic system supported on aluminosilicate SBA-15 mesostructured materials. POLYM ENG SCI 2008. [DOI: 10.1002/pen.20964] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Van Grieken R, Carrero A, Suarez I, Paredes B. Ethylene polymerization over supported MAO/(nBuCp)2ZrCl2 catalysts: Influence of support properties. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.01.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rom T, Best T, van Oosten D, Schneider U, Fölling S, Paredes B, Bloch I. Free fermion antibunching in a degenerate atomic Fermi gas released from an optical lattice. Nature 2006; 444:733-6. [PMID: 17151662 DOI: 10.1038/nature05319] [Citation(s) in RCA: 211] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Accepted: 10/06/2006] [Indexed: 11/09/2022]
Abstract
Noise in a quantum system is fundamentally governed by the statistics and the many-body state of the underlying particles. The correlated noise observed for bosonic particles (for example, photons or bosonic neutral atoms) can be explained within a classical field description with fluctuating phases; however, the anticorrelations ('antibunching') observed in the detection of fermionic particles have no classical analogue. Observations of such fermionic antibunching are scarce and have been confined to electrons and neutrons. Here we report the direct observation of antibunching of neutral fermionic atoms. By analysing the atomic shot noise in a set of standard absorption images of a gas of fermionic (40)K atoms released from an optical lattice, we find reduced correlations for distances related to the original spacing of the trapped atoms. The detection of such quantum statistical correlations has allowed us to characterize the ordering and temperature of the Fermi gas in the lattice. Moreover, our findings are an important step towards revealing fundamental fermionic many-body quantum phases in periodic potentials, which are at the focus of current research.
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Affiliation(s)
- T Rom
- Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, 55128 Mainz, Germany
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Karamitopoulou-Diamantis E, Paredes B, Vajtai I. Cutaneous neurocristic hamartoma with blue naevus-like features and plexiform dermal hyperneury. Histopathology 2006; 49:326-8. [PMID: 16918988 DOI: 10.1111/j.1365-2559.2006.02459.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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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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Affiliation(s)
- M Menéndez
- Chemical Engineering and Environmental Technology Department, University of Oviedo, 33006 Oviedo, Spain
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Paredes B, Verstraete F, Cirac JI. Exploiting quantum parallelism to simulate quantum random many-body systems. Phys Rev Lett 2005; 95:140501. [PMID: 16241634 DOI: 10.1103/physrevlett.95.140501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2005] [Indexed: 05/05/2023]
Abstract
We present an algorithm that exploits quantum parallelism to simulate randomness in a quantum system. In our scheme, all possible realizations of the random parameters are encoded quantum mechanically in a superposition state of an auxiliary system. We show how our algorithm allows for the efficient simulation of dynamics of quantum random spin chains with known numerical methods. We propose an experimental realization based on atoms in optical lattices in which disorder could be simulated in parallel and in a controlled way through the interaction with another atomic species.
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Affiliation(s)
- B Paredes
- Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, Garching, D-85748 Germany
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Paredes B, González S, Rendueles M, Villa-García MA, Díaz JM. Egg-White Protein Fractionation Using New Weak Anion-Exchange Resins Based on Poly(Glycidyl Methacrylate-co-Ethylendimethacrylate). Preparation and Characterization. J Chromatogr Sci 2005; 43:241-8. [PMID: 15975242 DOI: 10.1093/chromsci/43.5.241] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
A new formulation for a poly(glycidyl methacrylate-co-ethylendimethacrylate)-based resin with a 11:9 proportion of monomer to crosslinker is developed and amino-functionalized in order to obtain new particulate materials suitable for egg-white protein fractionation. Functionalization is carried out using three different chemical reagents: diethylamine (DEA), DEA-tetrahydrofuran (THF) (1:1), and concentrated ammonia. The ammonia- and DEA-THF-treated polymers are used to fractionate egg-white proteins, in particular lysozyme and ovalbumin, by anion-exchange chromatography in packed column experiments, the latter resin showing better performances. Finally, both supports, working at semipreparative scale and step-gradient elution, separate pure ovalbumin with a yield of 83%.
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Affiliation(s)
- B Paredes
- Department of Chemical Engineering and Environmental Technology, Oviedo University, Oviedo, Spain
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Abstract
AIM To describe the prevalence of cocaine and other drug use in secondary school students in Oviedo (Asturias, Northern Spain) and determine the personality features and levels of sensation seeking in cocaine users. METHODS 2,862 secondary school students (mean age +/- SD = 15.87+/-1.48 years; 50.6% males) were interviewed during the 1998-1999 academic year. For evaluation, the World Health Organization questionnaire for drug consumption, the Eysenck Personality Questionnaire (EPQ) for adults and the Zuckerman Sensation Seeking Scale were used. RESULTS The prevalence of lifetime, previous year and previous month cocaine use among secondary school students was 6.1, 4.9 and 2.7%, respectively. Cocaine ranked sixth among illicit drugs ever used by this population. Once individuals had used cocaine for the first time, they were likely to use it again (44.8% of those who had ever used cocaine reported that they had done so in the previous month). Compared to students who had never used cocaine (but who may have used other substances), cocaine users had a more extensive drug abuse history. Students who had used cocaine at some point during their lifetime scored significantly higher on the EPQ psychoticism subscale and reported higher levels of sensation seeking. CONCLUSIONS There is a significant rate of cocaine consumption amongst secondary school students of both sexes. Cocaine users are polyconsumers of other substances, both legal and illicit. Those who consume cocaine have a different psychological profile, characterized by high sensation seeking and high levels of psychoticism.
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Affiliation(s)
- P A Sáiz
- Department of Psychiatry, Faculty of Medicine, University of Oviedo, Spain
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Abstract
We propose a scheme to observe strongly correlated fermionic phenomena with bosonic atoms in optical lattices. For different values of the sign and strength of the scattering lengths, it is possible to reach either a "superconducting" regime, where the system exhibits atomic pairing, or a Luttinger liquid behavior. We identify the range of parameters where these phenomena appear, illustrate our predictions with numerical calculations, and show how to detect the presence of pairing.
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Affiliation(s)
- B Paredes
- Max-Planck Institute for Quantum Optics, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
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Suárez E, Paredes B, Rubiera F, Rendueles M, Villa-Garcı́a M, Dı́az J. Functionalized glycidyl methacrylate based polymers as stationary phases for protein retention. Sep Purif Technol 2002. [DOI: 10.1016/s1383-5866(01)00163-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
We discuss a way of creating, manipulating, and detecting anyons in rotating Bose-Einstein condensates consisting of a small number of atoms. By achieving a quasidegeneracy in the atomic motional states we drive the system into a 1/2-Laughlin state for fractional quantum Hall bosons. Localized 1/2-quasiholes can be created by focusing lasers at the desired positions. We show how to manipulate these quasiholes in order to probe directly their 1/2-statistics.
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Affiliation(s)
- B Paredes
- Institute for Theoretical Physics, University of Innsbruck, Innsbruck, Austria.
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González Bandrés C, Carrilero Ferrer MJ, Buznego Suárez L, García Claramunt MA, Méndez Llata M, Paredes B, Moriche Carretero M. [Efficacy of topical povidone-iodine applied the day before cataract surgery to reduce conjunctival flora]. Arch Soc Esp Oftalmol 2001; 76:229-34. [PMID: 11340513] [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] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
OBJECTIVE To evaluate the efficacy of the topical use of periocular and conjunctival povidone-iodine solution applied the day before cataract surgery to reduce conjunctival flora. PATIENTS AND METHODS Randomized and prospective clinical trial with 82 patients. The treatment group (41 patients) received an application of topical 10% povidone-iodine solution on the periocular skin and instillation of topical 5% povidone-iodine solution on the forniceal conjunctiva the day before and one hour before surgery. The control group (41 patients) only received the usual perioperative disinfectant. Conjunctival smears were obtained from in all patients at the end of the surgery and these were sent to the Microbiology Laboratory for culture. RESULTS In the treatment group 1 positive culture was found in the 41 eyes (2.4%). In the control group, there were positive cultures in 6 out of 41 eyes (14.6%). The difference is statistically significant (p<0.05). CONCLUSIONS The disinfecting of the periocular skin with 10% povidone-iodine solution and of the conjunctiva with 5% povidone-iodine solution the day before and one hour before cataract surgery is effective in reducing conjunctival bacterial colonization compared with perioperative disinfection alone.
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Affiliation(s)
- C González Bandrés
- Servicio de Oftalmología, Hospital General del INSALUD de Albacete, España
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Abstract
One hundred and three cases of Spitz nevi were reviewed, 36% of these patients were adults. The lesions in children occurred primarily on the face and secondarily on the trunk followed by the extremities. In adults, they affect the legs in women, and the trunk in men as does malignant melanoma. Clinically they were diagnosed more frequently as Spitz nevi in children and adolescents than in adults. Spitz nevi were most commonly mistaken clinically for "common" melanocytic nevus, hemangioma, verruca, fibrous histiocytoma, molluscum contagiosum, granuloma pyogenicum, keloid, and melanoma. Histologically, there are various expressions of Spitz nevi, but they are usually compound melanocytic nevi with little pigmentation and typically large spindle- and/or epithelioid melanocytes. There are only small histopathological differences between Spitz nevi in childhood and adulthood: one important feature rarely seen in Spitz nevi of adults is multiple mitotic figures at the dermo-epidermal junction but rarely at the base of the melanocytic nevus. Nevus Reed is considered to possibly be a distinctly pigmented variant of Spitz nevus.
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Affiliation(s)
- B Paredes
- Institut für Pathologie, Münsterlingen, Schweiz
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Paredes B, Quiñones E, Rebolledo D. [Program of neurosurgical nursing for national and foreign nurses]. ANEC 1969; 4:37-45. [PMID: 4101089] [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: 01/08/2023]
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