ORCID Profile
0000-0001-7994-954X
Current Organisation
Queensland University of Technology
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Publisher: Magnolia Press
Date: 05-2017
DOI: 10.11646/ZOOTAXA.4258.4.2
Abstract: Brachycephalus is a frog genus endemic to the Brazilian Atlantic Forest and characterized by the bright yellow-orange aposematic colors and the high degree of miniaturization. Herein, we describe a new species of Brachycephalus from Serra do Brigadeiro, Municipality of Ervália, Minas Gerais State, southeastern Brazil. Specimens were collected at high altitudes (i.e., 1266–1498 m above sea level) amidst the leaf litter. The new species is characterized by the presence of black connective tissue covering all dorsal muscles, body completely yellow-orange in life, presence of skull and post-cranial plates, large size (SVL of adults: 14.8–18.5 mm), bufoniform body, absence of metacarpal and metatarsal tubercles, and presence of harmonics in its advertisement call.
Publisher: Acta Herpetologica
Date: 2017
Publisher: MDPI AG
Date: 03-10-2022
Abstract: This article reports on the structure and electronic properties of carbon-rich polysilazane polymer-derived silicon carbonitride (C/SiCN) corresponding to pyrolysis temperatures between 1100 and 1600 °C in an argon atmosphere. Raman spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Hall measurements were used to support the structural and electronic properties characterization of the prepared C/SiCN nanocomposites. A structural analysis using Raman spectroscopy showed the evolution of sp2 hybridized carbon phase that resulted from the growth in the lateral crystallite size (La), average continuous graphene length including tortuosity (Leq) and inter-defects distance (LD) with an increase in pyrolysis temperature. The prepared C/SiCN monoliths showed a record high room temperature (RT) electrical conductivity of 9.6 S/cm for the s le prepared at 1600 °C. The electronic properties of the nanocomposites determined using Hall measurement revealed an anomalous change in the predominant charge carriers from n-type in the s les pyrolyzed at 1100 °C to predominantly p-type in the s les prepared at 1400 and 1600 °C. According to this outcome, tailor-made carbon-rich SiCN polymer-derived ceramics could be developed to produce n-type and p-type semiconductors for development of the next generation of electronic systems for applications in extreme temperature environments.
Publisher: Magnolia Press
Date: 25-01-2019
DOI: 10.11646/ZOOTAXA.4550.3.10
Abstract: The Neotropical genus Aparasphenodon Miranda-Ribeiro is composed of five recognized species commonly referred as “casque-headed frogs” (Frost 2018). Aparasphenodon brunoi Miranda-Ribeiro occurs in Atlantic Forest lowlands from the states of São Paulo to Bahia, Brazil (Feio et al. 1998 Mollo Neto & Teixeira Jr. 2012 Ruas et al. 2013). The biology of most Aparasphenodon species is poorly known. Within the genus, until now only Aparasphenodon arapapa Pimenta, Napoli & Haddad has its call formally described (Lourenço-de-Moraes et al., 2013, Forti et al., 2018, Guerra et al., 2018). Herein, we describe the advertisement call of Aparasphenodon brunoi Miranda-Ribeiro.
Publisher: Wiley
Date: 04-03-2021
Abstract: The field of Bioacoustics has flourished in the past few decades, with numerous initiatives towards its application as a tool for bio ersity conservation. Despite the development of new methods involving computational programming and machine learning algorithms, higher accuracy is still needed for species identification, which is why we present herein the new SoundShape package for R platform. The new package focuses on implementing the eigensound method, a promising, and yet little explored protocol for bioacoustical analysis. The eigensound function is the main feature of SoundShape , allowing its user to convert sound waves into a dataset that can be analysed similar to coordinate sets from Geometric Morphometrics Methods, thus enabling the direct comparison between stereotyped calls from different species. Besides, SoundShape also features complementary functions for basic analysis of quantitative variation and illustration of hypothetical sound shapes representing the s le of sounds. Implementation of SoundShape is summarized through a workflow guide, using data from the new package. The s le study resulted in nearly 90% variation expressed in an ordination plot, therefore successfully summarizing complex sound waves previously described by large datasets of litude values. Moreover, we also introduce two addendums to eigensound: (a) three steps to prevent errors and biased results—aimed at securing a meaningful comparison between acoustic units from different species and (b) the option of applying a logarithmic grid on the x ‐axis (time)—which emphasizes short duration calls while also encompassing long ones. SoundShape package now provide the tools required for anyone to replicate and implement the eigensound method on the r platform. This will enable future studies to focus on further exploring the applications of sound shape analysis on various scientific areas, including (but not limited to) taxonomy, systematics, evolution, acoustic niche partitioning, soundscape ecology and machine learning algorithms focused on species identification for conservation biology.
Publisher: Oecologia Australis
Date: 06-2019
Publisher: Elsevier BV
Date: 09-2018
Publisher: SAGE Publications
Date: 06-04-2017
Abstract: Several natural history studies on primary progressive multiple sclerosis (PPMS) patients detected a consistent heterogeneity in the rate of disability accumulation. To identify subgroups of PPMS patients with similar longitudinal trajectories of Expanded Disability Status Scale (EDSS) over time. All PPMS patients collected within the MSBase registry, who had their first EDSS assessment within 5 years from onset, were included in the analysis. Longitudinal EDSS scores were modeled by a latent class mixed model (LCMM), using a nonlinear function of time from onset. LCMM is an advanced statistical approach that models heterogeneity between patients by classifying them into unobserved groups showing similar characteristics. A total of 853 PPMS (51.7% females) from 24 countries with a mean age at onset of 42.4 years (standard deviation (SD): 10.8 years), a median baseline EDSS of 4 (interquartile range (IQR): 2.5–5.5), and 2.4 years of disease duration (SD: 1.5 years) were included. LCMM detected three different subgroups of patients with a mild ( n = 143 16.8%), moderate ( n = 378 44.3%), or severe ( n = 332 38.9%) disability trajectory. The probability of reaching EDSS 6 at 10 years was 0%, 46.4%, and 81.9% respectively. Applying an LCMM modeling approach to long-term EDSS data, it is possible to identify groups of PPMS patients with different prognosis.
Publisher: Magnolia Press
Date: 07-01-2016
DOI: 10.11646/ZOOTAXA.4061.3.6
Abstract: Bokermannohyla Faivovich, Haddad, Garcia, Frost, C bell & Wheeler (2005) is a Brazilian treefrog genus currently composed of 32 species (Brandão et al. 2012 Leite et al. 2012 Frost 2015). The genus comprehends four, putatively monophyletic, species groups: B. circumdata, B. claresignata, B. martinsi, and B. pseudopseudis (sensu Faivovich et al. 2005). The B. pseudopseudis group includes nine species: B. alvarengai (Bokermann 1956), B. flavopicta Leite et al. 2012, B. ibitiguara (Cardoso 1983), B. itapoty Lugli & Haddad 2006a, B. oxente Lugli & Haddad 2006b, B. pseudopseudis (Miranda-Ribeiro 1937), B. sagarana Leite et al. 2011, B. sapiranga Brandão et al. 2012, and B. saxicola (Bokermann 1964).
Publisher: Acta Herpetologica
Date: 2016
No related grants have been discovered for Pedro Rocha.