Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto

About: Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto is a based out in . It is known for research contribution in the topics: Population & Catalysis. The organization has 2143 authors who have published 3674 publications receiving 71071 citations. The organization is also known as: FFCLRP & FFCLRP-USP.

Spectroscopic, morphological and electrochromic characterization of layer-by-layer hybrid films of polyaniline and hexaniobate nanoscrolls

Abstract: The combination of semiconducting oxides and polyaniline in the nanoscale range may result in hybrid materials having enhanced properties, such as electrochromism and charge capacity. This paper reports the spectroscopic, morphological and electrochromic characterization of hybrid films made up of hexaniobate one-dimensional (1D) nanoscrolls and polyaniline prepared by the layer-by-layer assembly technique (LbL). Secondary electron imaging and backscattered electron imaging techniques performed using a scanning electron microscope showed that polyaniline is adsorbed on the hexaniobate nanoscrolls, which confirms the combination of the components in the nanoscale domain. UV-VIS-NIR electronic spectra of the LbL hybrid films showed the absorption tail in the NIR region, assigned to delocalized polarons of the polyaniline. Resonance Raman spectra in the 1000–1700 cm−1 range indicated that hybrid films present a higher relative intensity of polaron bands at 1337 and 1508 cm−1 than pristine polyaniline in the emeraldine salt form. These results suggest that hexaniobate nanoscrolls induce a secondary doping of polyaniline. The cyclic voltammetry (CV) data for the hybrid film showed a specific capacity of 870 C cm−3. According to CV results, the synergistic effect on charge storage properties of the hybrid material is attributed to the enhanced electroactivity of the hexaniobate component in the LbL film. Spectroelectrochemical experiments showed that the electrochromic efficiencies at 420 nm are ca. −41 and 24 cm2 C−1 as the potential changes from 0.8 to −0.9 V and from −0.9 to −1.8 V, respectively, whereas at 800 nm the efficiencies are ca. −55 and 8 cm2 C−1 for the same potential ranges. The electrochromic efficiencies and multi-colour character of the LbL film of hexaniobate nanoscrolls and polyaniline indicate that this novel hybrid material is an interesting modified electrode for electrochromic devices.

Non-coding transcription characterization and annotation: a guide and web resource for non-coding RNA databases.

Abstract: Large-scale transcriptome projects have shown that the number of RNA transcripts not coding for proteins (non-coding RNAs) is much larger than previously recognized. High-throughput technologies, coupled with bioinformatics approaches, have produced increasing amounts of data, highlighting the role of non-coding RNAs (ncRNAs) in biological processes. Data generated by these studies include diverse non-coding RNA classes from organisms of different kingdoms, which were obtained using different experimental and computational assays. This has led to a rapid increase of specialized RNA databases. The fast growth in the number of available databases makes integration of stored information a difficult task. We present here NRDR, a Non-coding RNA Databases Resource for information retrieval on ncRNA databases (www.ncrnadatabases.org). We performed a survey of 102 public databases on ncRNAs and we have introduced four categorizations to classify these databases and to help researchers quickly search and find the information they need: RNA family, information source, information content and available search mechanisms. NRDR is a useful databases searching tool that will facilitate research on ncRNAs.

Morphometric differences in a single wing cell can discriminate Apis mellifera racial types

Abstract: La morphometrie a joue depuis longtemps un role important dans les etudes de taxonomie. Lorsqu'elle est couplee aux statistiques multivariees, c'est un outil tres puissant pour les analyses discriminantes et donc-pour l'identification des especes. Chez Apis mellifera de nombreuses differences entre sous-especes sont quantitatives et les diverses etudes menees jusqu'a present ont toujours utilise les mesures de diverses parties du corps de l'abeille. Afin de simplifier et d'accelerer les analyses, nous avons mesure 11 caracteristiques d'une seule cellule de l'aile anterieure pour savoir si les differences dans cette cellule permettaient de discriminer les trois sous-especes A. mellifera ligustica, A. m. camica et les abeilles africanisees du Bresil. Une analyse en composantes principales a ete effectuee sur les mesures afin de determiner si notre corpus de donnees formait trois groupements distincts (Fig. 3). Ceux-ci ont ete verifies par une analyse discriminante (Fig. 4). Les caracteristiques retenues forment bien trois groupes significativement differents (P < 0,00001) et la fonction discriminative lineaire a pu classer correctement 98,7 % des echantillons. Ces resultats montrent que des mesures d'une petite partie du corps de l'abeille sont suffisantes pour discriminer les sous-especes.