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Search Results: 1 - 10 of 368548 matches for " Gabriel L. de;Zefa "
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Recognition characters and new records of two species of Phylloscyrtini (Orthoptera, Gryllidae, Trigonidiinae) from southern Brazil
Martins, Luciano de P.;Redü, Darlan R.;Oliveira, Gabriel L. de;Zefa, Edison;
Iheringia. Série Zoologia , 2012, DOI: 10.1590/S0073-47212012000100013
Abstract: the phylloscyrtini occurs from eastern united states to argentina and includes 21 valid species. it is a highly neglected group of crickets and little is known about its biology and distribution. cranistus colliurides st?l, 1861 and phylloscyrtus amoenus (burmeister, 1880) were recorded for the state of rio grande do sul, southern brazil, and information on calling song, stridulatory file and recognition characters were provided.
Characteristics of Prostate Cancers Missed by Biopsies: Evaluation of Cumulative Tumor Volume Missed According to Cancer True Prevalence  [PDF]
Nicolas B. Delongchamps, Gustavo de la Roza, Paul Perrin, Micha?l Peyromaure, Gabriel P. Haas
Open Journal of Urology (OJU) , 2013, DOI: 10.4236/oju.2013.35039

Purpose: To characterize missed prostate tumors and their cumulative volume with various biopsy regimens to determine optimal biopsy schemes. Methods: We performed 6, 12 and 18-core needle biopsies on 165 and 36-core biopsies on 47 autopsy prostates, respectively. The 6-core biopsy included 6 cores from the mid peripheral zone (MPZ), the 12-core biopsy included 6 cores from the MPZ and lateral PZ (LPZ), and the 18-core biopsies included 6 cores from the MPZ, LPZ and central zone (CZ). The 36-core biopsies included 12 cores in each of these 3 areas. We analyzed the sensitivity of biopsies at each site and evaluated the cumulative volume of cancers and tumor foci missed. Results: Whole-mount analysis identified 59 cancers, 110 tumor foci, and a total cumulative tumor volume of 43 cm3. The percentage of tumor foci and corresponding cumulative volume missed with 6, 12, 18 and 36-core biopsies were of 79% and 58%, 64% and 48%, 57% and 26%, and 42% and 17%, respectively (p < 0.05). 12-core biopsies from the MPZ and LPZ performed best for clinically significant cancers detection. However, increasing the number of cores over the 6-core biopsy cutoff increased solely the detection of tumor foci < 0.5 cm3. Conclusion:

Cryptic species of Gryllus in the light of bioacoustic (Orthoptera: Gryllidae)
David, José A. de O.;Zefa, Edison;Fontanetti, Carmem S.;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000100010
Abstract: the gryllus genus represents one the most complex in the orthoptera systematic, characterized by a set of cosmopolite and cryptic species, many of them already described. this study compared the songs emitted by gryllus specimens collected on the unesp campus in rio claro (sp) and the pars stridens morphology and morphometry, to use the results to recognize possible cryptic species and contribute to the discussion of speciation processes. three groups of crickets were discriminated by differences in the pars stridens and calling songs, characterized by different rhythms, frequencies and note composition, that indicated the presence of three species in the location analyzed, that presented few morphological differences. it is suggested from the results that the use of the pars stridens characteristics and the calling song as diagnostic traits is essential in the gryllus taxonomy.
Complex mating behavior in Adelosgryllus rubricephalus (Orthoptera, Phalangopsidae, Grylloidea)
Zefa, Edison;Martins, Luciano de P.;Szinwelski, Neucir;
Iheringia. Série Zoologia , 2008, DOI: 10.1590/S0073-47212008000300006
Abstract: we describe the mating behavior of adelosgryllus rubricephalus mesa & zefa, 2004. in trials carried out in laboratory we verified the following mating sequence: (1) sexual recognition by antennation; (2) courtship with male turning his abdomen towards the female, performing mediolateral antennae vibration, jerking its body antero-posteriorly and stridulating intermittently, while receptive female drums on the male's abdomen tip, cerci and hind-tibia with her palpi or foretarsi; the male then stops and stays motionless for some seconds, extrudes the spermatophore and both restart the behavioral sequence described above; (3) copulation: male underneath female; with his tegmina inclined forward, and joins his genitalia to the female's to promote sperm transference ; the female steps off the male, occurring a brief end-to-end position; (4) postcopulation: without guarding behavior; male retains the spermatophore and eats it. we quantified elapsed time of each behavioral sequence and discussed its implications in the observed mating behavior.
Jo?o Gabriel L. C. Teixeira,Edson Silva de Farias
Sociedade e Estado , 2008, DOI: 10.1590/s0102-69922008000300001
Jo?o Gabriel L. C. Teixeira,Edson Silva de Farias
Sociedade e Estado , 2008, DOI: 10.1590/s0102-69922008000200001
Nativiza o e manuten o de acento oxítono em Português Nativization and final stres maintenance in Portuguese
Gabriel Antunes de Araujo ; Ana Lívia dos Santos Agostinho
Signótica , 2009, DOI: 10.5216/sig.v21i2.9159
Abstract: O objetivo deste artigo é investigar se houve manuten o de acento oxítono na nativiza o de palavras de origem estrangeira, baseando-se em um corpus formado por 10.494 palavras com acento final (ou oxítonas) no português. Mostraremos que há uma tendência em manter o acento da língua-fonte. As línguas-fontes investigadas nesta pesquisa s o o latim, o ‘tupi’, o francês, o árabe, o iorubá, o inglês, o espanhol, o grego e o cancani. Também discutiremos a qualidade do elemento final da oxítona (se vogal, glide ou consoante) e o século de entrada no português. The aim of this paper is to investigate stress maintenance in a corpus of final stress words (also known as oxytone) in Portuguese. The corpus contains 10.494 noun words with final stress and their respective phonetic transcriptions from the Houaiss Dictionary. We argue that there is a tendency to keep the final stress as in their source language, especially Latin, ‘Tupi’, French, Arabic, Ioruba, English, Spanish, Greek and Concani. We also discuss the quality of the final element (if vowel, glide or consonant) and the connexion with the documented century of the lexical borrowing.
What does anisotropy measure? Insights from increased and decreased anisotropy in selective fiber tracts in schizophrenia
L. M. Alba-Ferrara,Gabriel A. de Erausquin
Frontiers in Integrative Neuroscience , 2013, DOI: 10.3389/fnint.2013.00009
Abstract: Schizophrenia is a common, severe, and chronically disabling mental illness of unknown cause. Recent MRI studies have focused attention on white matter abnormalities in schizophrenia using diffusion tensor imaging (DTI). Indices commonly derived from DTI include (1) mean diffusivity, independent of direction, (2) fractional anisotropy (FA) or relative anisotropy (RA), (3) axial diffusivity, and (4) radial diffusivity. In cerebral white matter, contributions to these indices come from fiber arrangements, degree of myelination, and axonal integrity. Relatively pure deficits in myelin result in a modest increase in radial diffusivity, without affecting axial diffusivity and with preservation of anisotropy. Although schizophrenia is not characterized by gross abnormalities of white matter, it does involve a profound dysregulation of myelin-associated gene expression, reductions in oligodendrocyte numbers, and marked abnormalities in the ultrastructure of myelin sheaths. Since each oligodendrocyte myelinates as many as 40 axon segments, changes in the number of oligodendrocytes (OLG), and/or in the integrity of myelin sheaths, and/or axoglial contacts can have a profound impact on signal propagation and the integrity of neuronal circuits. Whereas a number of studies have revealed inconsistent decreases in anisotropy in schizophrenia, we and others have found increased FA in key subcortical tracts associated with the circuits underlying symptom generation in schizophrenia. We review data revealing increased anisotropy in dopaminergic tracts in the mesencephalon of schizophrenics and their unaffected relatives, and discuss the possible biological underpinnings and physiological significance of this finding.
Autosomal rearrangement in Gryllus assimilis Fabricius, 1775 (Orthoptera, Gryllidae)
Zefa, Edison;
Genetics and Molecular Biology , 1999, DOI: 10.1590/S1415-47571999000300008
Abstract: gryllus assimilis l. has a karyotype of 2n = 29 (x0, male) and 30 (xx, female). the above karyotype was encountered along with another in which 2n = 28 (x0, male) and 2n = 29 (xx, female) in a population from the outskirts of rio claro city (s?o paulo state, brazil). of eight specimens studied, five had the heterozygous karyotype involving a translocation and three had the basic karyotype. there were no individuals homozygous for the rearrangement. the heterozygous karyotype was the result of a chromosomal rearrangement between chromosome pairs 6 and 10, both of which were initially submetacentric. the members of the sixth pair normally have two constrictions in the small arm, with a satellite at the chromosome tip. the chromosome of the tenth pair involved in the translocation was generally submetacentric and probably underwent a pericentric inversion which transported the centromere to a subterminal position before being translocated. in this case, the long arm of the inverted chromosome of the tenth pair was translocated with the satellite of a member of the sixth pair.
Comparison of calling songs in three allopatric populations of Endecous itatibensis (Orthoptera, Phalangopsinae)
Zefa, Edison;
Iheringia. Série Zoologia , 2006, DOI: 10.1590/S0073-47212006000100002
Abstract: three isolated populations of the cricket endecous itatibensis rehn, 1918 had been analyzed to test the hypothesis of divergence in the calling song estridulation and to discuss its implications in the speciation process. the song registers were obtained from specimens in corumbataí, piraciacaba and itatiba cities, state of s?o paulo, brazil. in the three analyzed populations, calling songs are composed by pairs of notes. specimens from corumbataí emit composed phrases with 3 to 18 pairs of notes, while those of piracicaba and itatiba have 1 to 3 pairs of notes. inter- and intrapopulational variability in the frequencies of acoustic signals were detected. while recording the calling songs, other stridulations were registered, possibly from species of orthoptera or hemiptera. when the tapes were analyzed in the laboratory, it was verified that there was no overlap among the species' calling songs, in such a way that each species had their particular band of frequencies, avoiding interespecific acoustic competition.
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