Search results for: Manuel Valiente

Items from 1 to 20 out of 56 results

article

Toward Plasmonic Neural Probes: SERS Detection of Neurotransmitters through Gold‐Nanoislands‐Decorated Tapered Optical Fibers with Sub‐10 nm Gaps

Di Zheng, Filippo Pisano, Liam Collard, Antonio Balena, more

Advanced Materials > 35 > 11 > n/a - n/a

Integration of plasmonic nanostructures with fiber‐optics‐based neural probes enables label‐free detection of molecular fingerprints via surface‐enhanced Raman spectroscopy (SERS), and it represents a fascinating technological horizon to investigate brain function. However, developing neuroplasmonic probes that can interface with deep brain regions with minimal invasiveness while providing the sensitivity...

article

Toward Plasmonic Neural Probes: SERS Detection of Neurotransmitters through Gold‐Nanoislands‐Decorated Tapered Optical Fibers with Sub‐10 nm Gaps (Adv. Mater. 11/2023)

Di Zheng, Filippo Pisano, Liam Collard, Antonio Balena, more

Advanced Materials > 35 > 11 > n/a - n/a

Neurochemical Detection In article number 2200902, Di Zheng, Massimo De Vittorio, Ferruccio Pisanello, and co‐workers present a surface‐enhanced Raman scattering (SERS)‐active probe based on a tapered optical fiber decorated with sub‐10 nm‐gap gold nanoislands, which is designed for neurochemical detection. Through‐fiber measurements show the fabricated device can detect neurotransmitters down to...

article

Direct and indirect selenium speciation in biofortified wheat: A tale of two techniques

Maria Angels Subirana, Roberto Boada, Tingting Xiao, Mercè Llugany, more

Physiologia Plantarum > 175 > 1 > n/a - n/a

Wheat can be biofortified with different inorganic selenium (Se) forms, selenite or selenate. The choice of Se source influences the physiological response of the plant and the Se metabolites produced. We looked at selenium uptake, distribution and metabolization in wheat exposed to selenite, selenate and a 1:1 molar mixture of both to determine the impact of each treatment on the Se speciation in...

article

Calcium oxalate kidney stones, where is the organic matter?: A synchrotron based infrared microspectroscopy study

Iris H. Valido, Montserrat Resina‐Gallego, Ibraheem Yousef, Maria Pilar Luque‐Gálvez, more

Journal of Biophotonics > 13 > 12 > n/a - n/a

Kidney stones are collections of microcrystals formed inside the kidneys, which affect 6% to 12% of the population worldwide, with an increasing recurrence (50%‐72%) after the first episode. The most abundant type is calcium oxalate (66%), described as monohydrated (COM) and dihydrated (COD). An issue in their chemistry is the transformation process of the metastable specie (COD) into the stable one,...

article

Tooth whitening: From the established treatments to novel approaches to prevent side effects

Jorge Rodríguez‐Martínez, Manuel Valiente, María‐Jesús Sánchez‐Martín

Journal of Esthetic and Restorative Dentistry > 31 > 5 > 431 - 440

Objective The aim is to review the most important aspects about tooth whitening treatments, their side effects, and the new emerging approaches to overcome them. Overview This review is focused on origin of tooth stains, the whitening systems and their chemistry, their side effects, and the new approaches. The search of bibliography of the period 1965‐2018 has been analyzed. Conclusions Tooth...

article

Use of alternating current for colored water purification by anodic oxidation with SS/PbO₂ and Pb/PbO₂ electrodes

Amina Othmani, Aida Kesraoui, Hanene Akrout, Montserrat López-Mesas, more

Environmental Science and Pollution Research > 2019 > 26 > 25 > 25969- 25984

This paper suggests a new alternative for the acceleration of dye removal by adopting alternating current instead of direct current in the treatment of methylene blue solutions and industrials effluents, using anodic oxidation on Pb/PbO₂ and stainless steel (SS)/PbO₂ anodes. A comparative study of the influence of electrolyte support (NaCl, NaNO₃, and Na₂SO₄) on the anodic oxidation performance and...

article

Local Gastrointestinal Injury Exacerbates Inflammation and Dopaminergic Cell Death in Parkinsonian Mice

Ana-Luisa Gil-Martínez, Cristina Estrada, Lorena Cuenca, Juan-Antonio Cano, more

Neurotoxicity Research > 2019 > 35 > 4 > 918-930

The cause of progressive degeneration in Parkinson’s disease is not clear, although, in the last years, different studies have suggested that both brain and peripheral inflammation could play a key role in the progression of this disorder. In our study, we aimed to analyze the effect of an acute inflammation confined to the colon on dopaminergic neuronal death and glial response in mice intoxicated...

article

Thermodynamics of Hg²⁺ and Ag⁺ adsorption by 3-mercaptopropionic acid-functionalized superparamagnetic iron oxide nanoparticles

Sara Gràcia Lanas, Manuel Valiente, Marilena Tolazzi, Andrea Melchior

Journal of Thermal Analysis and Calorimetry > 2019 > 136 > 3 > 1153-1162

Superparamagnetic iron nanoparticles (SPION) have been functionalized with 3-mercaptopropionic acid (3-MPA), characterized and applied for the removal of Ag⁺, Hg²⁺ and Pb²⁺ metal ions from aqueous solutions by iron oxide (Fe₃O₄). The heavy metal adsorption has been investigated by means of ICP-OES and isothermal titration calorimetry. Experimental data ware better fitted by Langmuir rather than Freundlich...

article

From Few to Many Body Degrees of Freedom

Manuel Valiente

Few-Body Systems > 2018 > 59 > 5 > 1-16

Here, I focus on the use of microscopic, few-body techniques that are relevant in the many-body problem. These methods can be divided into indirect and direct. In particular, indirect methods are concerned with the simplification of the many-body problem by substituting the full, microscopic interactions by pseudopotentials which are designed to reproduce collisional information at specified energies,...

article

Thermodynamics of sorption of platinum on superparamagnetic nanoparticles functionalized with mercapto groups

Andrea Melchior, Sara Gràcia Lanas, Manuel Valiente, Marilena Tolazzi

Journal of Thermal Analysis and Calorimetry > 2018 > 134 > 2 > 1261-1266

The adsorption of Pt(IV) by iron oxide (Fe₃O₄) superparamagnetic nanoparticles (SPION) functionalized with 3-mercaptopropionic acid (3-MPA) is investigated by means of inductively coupled plasma optical emission spectrometry and isothermal titration calorimetry. Experimental ICP data are better fitted by Langmuir rather than Freundlich isotherms. The whole thermodynamic parameters and maximum loading...

article

87Sr/86Sr isotope ratio and multielemental signatures as indicators of origin of European cured hams: The role of salt

Ekaterina N. Epova, Sylvain Bérail, Tea Zuliani, Julien Malherbe, more

Food Chemistry > 2018 > 246 > C > 313-322

We have examined the potential of discriminant inorganic constituents (trace-, ultra-trace elements and Sr isotope ratios) to assess the origin of world famous brands of European dry-cured hams. The variation of the multielemental composition with principal component analysis allowed to discriminate the origin of Bayonne hams. Determined ratio ⁸⁷Sr/⁸⁶Sr was recognized as a strong additional distinctive...

article

T lymphocytes facilitate brain metastasis of breast cancer by inducing Guanylate-Binding Protein 1 expression

Dana A. M. Mustafa, Rute M. S. M. Pedrosa, Marcel Smid, Marcel Weiden, more

Acta Neuropathologica > 2018 > 135 > 4 > 581-599

The discovery of genes and molecular pathways involved in the formation of brain metastasis would direct the development of therapeutic strategies to prevent this deadly complication of cancer. By comparing gene expression profiles of Estrogen Receptor negative (ER-) primary breast tumors between patients who developed metastasis to brain and to organs other than brain, we found that T lymphocytes...

article

myStone: A system for automatic kidney stone classification

Joan Serrat, Felipe Lumbreras, Francisco Blanco, Manuel Valiente, more

Expert Systems with Applications > 2017 > 89 > C > 41-51

Kidney stone formation is a common disease and the incidence rate is constantly increasing worldwide. It has been shown that the classification of kidney stones can lead to an important reduction of the recurrence rate. The classification of kidney stones by human experts on the basis of certain visual color and texture features is one of the most employed techniques. However, the knowledge of how...

article

Simultaneous determination of BTEX and their metabolites using solid-phase microextraction followed by HPLC or GC/MS: An application in teeth as environmental biomarkers

Johannes L. González, Albert Pell, Montserrat López-Mesas, Manuel Valiente

Science of The Total Environment > 2017 > 603-604 > C > 109-117

Applications of benzene, toluene, ethylbenzene, and o-, m-, and p-xylenes (BTEX) release them into the environment exposing living organism. These endocrine disruptors are toxic, highly volatile and easily absorbed by the lungs and can cause adverse consequences for the human health as neurological diseases and cancer.A method for the analysis of BTEX and its metabolites (phenols and aromatic acids)...

chapter

Quantum droplets of light in the presence of synthetic magnetic fields

Kali Wilson, Niclas Westerberg, Manuel Valiente, Callum Duncan, more

2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) > 1

2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Recently, quantum droplets have been demonstrated in dipolar Bose-Einstein condensates, where the long range (nonlocal) attractive interaction is counterbalanced by a local repulsive interaction [1]. In this work, we investigate the formation of quantum droplets in a two-dimensional nonlocal fluid of light. Fluids of light allow us to control the geometry of the system, and thus introduce vorticity...

article

Fast determination of bioactive phytic acid and pyrophosphate in walnuts using microwave accelerated extraction

Tong Liu, Liu He, Manuel Valiente, Montserrat López-Mesas

Food Chemistry > 2017 > 221 > C > 771-775

Bioactive compounds phytic acid (IP6) and pyrophosphate (PPi) are minor components of walnuts with the ability of being inhibitors of urolithiasis, among others. Since simultaneous analysis of IP6 and PPi have known drawbacks, a new method to determine their content in walnuts has been developed with emphasis on their extraction from walnuts by microwave-assisted extraction (MAE). Acid content of...

article

Neuregulin 3 Mediates Cortical Plate Invasion and Laminar Allocation of GABAergic Interneurons

Giorgia Bartolini, Juan Antonio Sánchez-Alcañiz, Catarina Osório, Manuel Valiente, more

Cell Reports > 2017 > 18 > 5 > 1157-1170

Neural circuits in the cerebral cortex consist of excitatory pyramidal cells and inhibitory interneurons. These two main classes of cortical neurons follow largely different genetic programs, yet they assemble into highly specialized circuits during development following a very precise choreography. Previous studies have shown that signals produced by pyramidal cells influence the migration of cortical...

article

Unitary fermions and Lüscher’s formula on a crystal

Manuel Valiente, Nikolaj T. Zinner

Science China Physics, Mechanics & Astronomy > 2016 > 59 > 11 > 1-8

We consider the low-energy particle-particle scattering properties in a periodic simple cubic crystal. In particular, we investigate the relation between the two-body scattering length and the energy shift experienced by the lowest-lying unbound state when this is placed in a periodic finite box. We introduce a continuum model for s-wave contact interactions that respects the symmetry of the Brillouin...

article

Hollow fibre liquid phase micro‐extraction by facilitated anionic exchange for the determination of flavonoids in faba beans (Vicia faba L.)

Nadia Chaieb, Montserrat López‐Mesas, Johannes Luis González, Messaoud Mars, more

Phytochemical Analysis > 26 > 5 > 346 - 352

IntroductionFlavonoids are polyphenolic compounds found ubiquitously in foods of plant origin. They are commonly extracted from plant materials with ethanol, methanol, water, their combination or even with acidified extracting solutions. The disadvantages of these methods are the use of high quantity of organic solvent, the possible loss of analytes in the different steps and the laborious process...

article

Effective Field Theory of Interactions on the Lattice

Manuel Valiente, Nikolaj Thomas Zinner

Few-Body Systems > 2015 > 56 > 11-12 > 845-851

We consider renormalization of effective field theory interactions by discretizing the continuum on a tight-binding lattice. After studying the one-dimensional problem, we address s-wave collisions in three dimensions and relate the bare lattice coupling constants to the continuum coupling constants. Our method constitutes a very simple avenue for the systematic renormalization in effective field...

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INFONA - science communication portal

Search results for: Manuel Valiente

Toward Plasmonic Neural Probes: SERS Detection of Neurotransmitters through Gold‐Nanoislands‐Decorated Tapered Optical Fibers with Sub‐10 nm Gaps

Toward Plasmonic Neural Probes: SERS Detection of Neurotransmitters through Gold‐Nanoislands‐Decorated Tapered Optical Fibers with Sub‐10 nm Gaps (Adv. Mater. 11/2023)

Direct and indirect selenium speciation in biofortified wheat: A tale of two techniques

Calcium oxalate kidney stones, where is the organic matter?: A synchrotron based infrared microspectroscopy study

Tooth whitening: From the established treatments to novel approaches to prevent side effects

Use of alternating current for colored water purification by anodic oxidation with SS/PbO₂ and Pb/PbO₂ electrodes

Local Gastrointestinal Injury Exacerbates Inflammation and Dopaminergic Cell Death in Parkinsonian Mice

Thermodynamics of Hg²⁺ and Ag⁺ adsorption by 3-mercaptopropionic acid-functionalized superparamagnetic iron oxide nanoparticles

From Few to Many Body Degrees of Freedom

Thermodynamics of sorption of platinum on superparamagnetic nanoparticles functionalized with mercapto groups

87Sr/86Sr isotope ratio and multielemental signatures as indicators of origin of European cured hams: The role of salt

T lymphocytes facilitate brain metastasis of breast cancer by inducing Guanylate-Binding Protein 1 expression

myStone: A system for automatic kidney stone classification

Simultaneous determination of BTEX and their metabolites using solid-phase microextraction followed by HPLC or GC/MS: An application in teeth as environmental biomarkers

Quantum droplets of light in the presence of synthetic magnetic fields

Fast determination of bioactive phytic acid and pyrophosphate in walnuts using microwave accelerated extraction

Neuregulin 3 Mediates Cortical Plate Invasion and Laminar Allocation of GABAergic Interneurons

Unitary fermions and Lüscher’s formula on a crystal

Hollow fibre liquid phase micro‐extraction by facilitated anionic exchange for the determination of flavonoids in faba beans (Vicia faba L.)

Effective Field Theory of Interactions on the Lattice

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