Search results for "Polyp"

Memory effects in functionalized conducting polymer films: titanocene derivatized polypyrrole in contact with THF solutions

2003

Abstract Films with a polypyrrole matrix and pendant titanocene dichloride centers, p(Tc3Py), have been obtained by potentiostatic electropolymerization of the titanocene-pyrrolyl derivative, Tc3Py=Tc(CH 2 ) 3 NC 4 H 4 (Tc=Cl 2 TiCpCp′, Cp=C 5 H 5 , Cp′=C 5 H 4 ), in acetonitrile (AN) solutions on a Pt surface. The redox activity has been studied after the transfer of the film-coated electrode into the monomer-free solution of the same electrolyte, TBAPF 6 , in THF. Contrary to the case of AN or dichloromethane solutions, one can achieve a stable redox activity of the immobilized Tc centers in THF solutions during a series of cycles. A parallel between the redox properties of the Tc complex…

Mass/charge balance as a tool to estimate dimensional change in polypyrrole-based actuators

2006

The deconvolution of the voltammograms of polypyrrole electrochemistry has proved to be possible through the electrochemical quartz crystal microbalance data using the F(dm/dQ) function. This deconvolution allows the evolution of the thickness of the polypyrrole films during their redox processes to be estimated and therefore, the mechanical contraction/decontraction of this polymer as a function of the ionic exchange processes can be evaluated. Keywords: Polypyrrole, EQCM, Thickness change

In Vivo Imaging of Enteric Neuronal Networks in Humans Using Confocal Laser Endomicroscopy

2012

Impact of Pulsed Electric Fields on Enzymes

2017

International audience; Pulsed electric field (PEF) processing has emerged as a promising technology in the development of tailor-made processes to effectively control the enzyme activity. It has been proven as an effective technique for the preservation of food products as it can result in substantial inactivation of most undesirable enzymes. When compared to microbial inactivation, however, large specific energy inputs are required to inactivate enzymes. The existing evidence suggests that PEF can also stimulate the activity of beneficial enzymes at low intense treatments. The PEF affects enzyme activity by changing mainly the secondary (α-helix, β-sheets, etc.), tertiary (spatial conform…

Prediction of the chemiluminescent behaviour of phenols and polyphenols.

2002

Abstract A paper from this laboratory ‘J. Anal. Chem. 73 (2001) 4301’ was recently published and dealing with the first attempt to apply molecular connectivity calculations to predict a chemical property with analytical usefulness; namely, the chemiluminescent behaviour of substances when react with common strong oxidants in liquid phase. In the present work, the usefulness of molecular topology on the search for new chemiluminescent compounds is clearly demonstrated. The proposed discriminant equation, represented a success of 92.7% in the prediction. The present paper is the further step from the cited paper; it is dealing on the application of molecular connectivity calculations (former …

Coordination polymers based on bridging cyanocarbanions and bis-tridentate p-phenylenediamine ligands

2017

Two new Cu(II) coordination polymeric neutral chains of formula [Cu 2 (1,4-tpbd)(μ-A) 2 (H 2 O) 2 ](A) 2 with A = tcnoet − ( 1 ) and tcnopr − ( 2 ) (1,4-tpbd =  N,N,N′N′ -tetrakis(2-pyridylmethyl)benzene-1,4-diamine, tcnoet −  = 1,1,3,3-tetracyano-2-ethoxypropenide and tcnopr −  = 1,1,3,3-tetracyano-2-propoxypropenide) have been synthesized and characterized by infrared spectroscopy, X-ray diffraction and magnetic measurements. 1  and  2 show alternating chains where the 1,4-tpbd and the cyanocarbanion units (tcnoet − for 1 and tcnopr − for 2 ) alternate as bridging ligands. The molecular structure can be viewed as [Cu 2 (μ-tpbd)] 4+ dinuclear units (with Cu⋯Cu distances of 8.2233(3) for 1 …

Polyphenols from halophytes and modified atmosphere packaging improve sensorial and biochemical markers of quality of common dolphinfish (Coryphaena …

2016

Quality and shelf-life of whole and filleted Coryphaena hippurus, stored with modified atmosphere packaging (MAP) and natural antioxidants from halophytes (HAL), were investigated. Fillets were divided into control, simply sealed in trays; MAP, preserved by modified atmosphere (45% CO2, 50% N-2, 5% O-2); and MAP-HAL, pretreated with antioxidants and preserved by MAP. Whole and filleted fish were stored at -1 +/- 0.5 degrees C for 18days. The quality of the samples was analyzed at the time of packaging and after 3, 6, 9, 12, 15, and 18days. The MAP and MAP-HAL groups maintained the best sensorial profile, pH, and drip loss with respect to the untreated fillets. Higher levels of total volatil…

Transgresión de un silencio obligado: la polifonía discursiva de Leonardo Padura

2014

Resumen : En este articulo intentamos demostrar la riqueza polifonica de la prosa de Leonardo Padura destacando las multiples voces que dialogan en las paginas de sus novelas y los distintos generos y formas que estas adoptan. Ademas pretendemos destacar esta combinacion polifonica como una medida de oposicion al discurso oficial cubano de los anos setenta. Palabras Clave : Polifonia discursiva, neopolicial, Padura, Cuba. Abstract: In this paper we try to demonstrate the polyphonic wealth of Leonardo Padura's prose.  To achieve this, we emphasize the multiple voices talking from the pages of his novels and the different genres and forms that these voices are able to adopt. Besides, we seek …

Sobre una ?poesía que se piensa en el lenguaje?. ¿Hacia una nueva vanguardia en la poesía española?

2018

En la última década puede observarse una renovación de las poéticas en España, tras un largo periodo de hegemonía de la lírica realista o figurativa. Aunque aún lejos de cuestionar el predominio a nivel editorial de la conocida como “poesía de la experiencia”, sí es evidente que el descrédito de la vanguardia va siendo superado y que, en formas múltiples y personales, alejadas de ningún movimiento grupal, muchos de los poetas jóvenes vuelven a poner en cuestión el lenguaje, cuestionamiento que suele relacionarse con un intenso tratamiento de lo corporal. Todo ello relacionado con una mayor lectura de la poesía latinoamericana y de otras tradiciones. En este artículo se pretende acercar al l…

Functional bread supplemented with Pleurotus eryngii powder: A potential new food for human health

2022

The purpose of this study was to develop functional breads with powdered Pleurotus eryngii. The breads were produced applying the traditional Italian style sourdough technology. P. eryngii powder was added to flour of tender wheat varieties (Grano Dei Miracoli, Inalettabile, Mentana, Gentilrosso, Ardito and a mix of Rieti, Verna, and Mentana) or semolina of durum wheat landrace (Saragolla) and subjected to sourdough fermentation. Sourdough inoculum was produced with selected strains of lactic acid bacteria (LAB) belonging to the species Levilactobacillus brevis, Weissella cibaria and Leuconostoc citreum. The addition of Pleurotus powdered (PP) (10% w/w) did not influence the fermentation pr…