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Resumo O conteúdo de dopamina nas estruturas cerebrais tem sido relacionado à excitabilidade neuronal e várias abordagens têm sido utilizadas para estudar este fenômeno durante o período de vulnerabilidade às crises. No presente trabalho, descrevemos os efeitos da depleção de dopamina após a administração de 6-hidroxidopamina (6-OHDA) na região pars compacta da substância negra de ratos submetidos ao modelo de epilepsia com pilocarpina. A susceptibilidade ao estado de mal epiléptico induzido pela pilocarpina, bem como a frequência de crises espontâneas e recorrentes durante o período crônico do modelo foi determinada. Sendo o hipocampo uma das principais estruturas afetadas no desenvolvimento desse modelo experimental de epilepsia, os níveis de dopamina nessa região foram determinados após a administração da droga. No primeiro experimento, 62% (15/24) dos ratos pré-tratados com 6-OHDA e 45% (11/24) daqueles que receberam ácido ascórbico como solução controle evoluíram para crises límbicas motoras e para o estado de mal epiléptico, após a administração de pilocarpina. A gravidade das crises durante o período agudo do modelo foi significativamente maior nos ratos epilépticos experimentais (56,52%) do que nos ratos controle (4,16%). No segundo experimento, não houve diferença significante entre os grupos quanto à frequência de crises na fase crônica do modelo. Nossos dados mostraram que a dopamina pode desempenhar um papel importante na gravidade das crises na fase aguda da pilo, o que parece ser exercido por sua ação inibitória da dopamina sobre a expressão motora das crises.

Abstract The dopamine content in cerebral structures has been related to neuronal excitability and several approaches have been used to study this phenomenon during seizure vulnerability period. In the present work, we describe the effects of dopamine depletion after the administration of 6-hidroxidopamine (6-OHDA) into the substantia nigra pars compacta of male rats submitted to the pilocarpine model of epilepsy. Susceptibility to pilocarpine-induced status epilepticus (SE), as well as spontaneous and recurrent seizures (SRSs) frequency during the chronic period of the model were determined. Since the hippocampus is one of main structures in the development of this experimental model of epilepsy, the dopamine levels in this region were also determined after drug administration. In the first experiment, 62% (15/24) of 6-OHDA pre-treated rats and 45% (11/24) of those receiving ascorbic acid as control solution progressed to motor limbic seizures evolving to SE, after the administration of pilocarpine. Severeness of seizures during the model´s the acute period, was significantly higher in epileptic experimental rats (56.52%), than in controls (4.16%). In the second experiment, the frequency of seizures in the model’s chronic phase did not significantly change between groups. Our data show that dopamine may play an important role on seizure severity in the pilo’s model acute period, which seems to be due to dopamine inhibitory action on motor expression of seizure.

https://doi.org/10.1590/1519-6984.248411

The identity of Syllepte incomptalis Hübner (Lepidoptera: Crambidae: Spilomelinae) with synonymies, new combinations and new species Lepidoptera (Lepidoptera Crambidae Spilomelinae synonymies
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Becker, Vitor Osmar

Revista Brasileira de Entomologia

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2023, Volume 67 Nº 1 elocation e20220093

Resumo: En | Texto: En | PDF: En

ABSTRACT The identity of Syllepte incomptalis Hübner, 1823 is elucidated. Pantographa Lederer, 1863, syn. n., and Micromartinia Amsel, 1957, syn. n., are junior synonyms of Syllepte Hübner, 1823, including 15 species: S. incomptalis Hübner, 1823 (=P. idmonalis Druce, 1895, syn. n.); S. acoetesalis (Walker, 1859), comb. n.; dialis Schaus, 1912 (=S. strigicincta Hampson, 1912, syn. n.); S. expansalis (Lederer, 1863), comb. n.; S. gorgonalis (Druce, 1895), comb. n.; S. limata (Grote & Robinson, 1867), comb. n.; S. scripturalis (Guenée, 1854), comb. n.; S. suffusalis (Druce, 1895), comb. n.; S. fraternalis Becker, sp. n., from Mexico; S. confusalis Becker, sp. n. from Brazil, and S. sororalis Becker, sp. n., from Brazil. Neomabra Dognin, 1905, stat. rev., is revalidated, including two species: N. nitidalis Dognin, 1905, comb. rev. and N. serratilinealis (Lederer, 1863), comb. n. Bocchoropsis Amsel, 1956, syn. n. is a junior synonym of Haritalodes Warren, 1890, including two species: H. derogata (Fabricius, 1775) and H. pharaxalis (Druce, 1895), comb. n. (=S. prorogata Hampson, 1912, syn. n.; =B. plenilinealis Dyar, 1917, syn. n.). Psara imbroglialis (Dyar, 1914), comb. n. [from Syllepte]. Illustrations of adults and genitalia are provided to enable the identification of the species treated here. Hübner 182 elucidated Lederer 1863 syn n Amsel 1957 1 S =P. P (=P Druce 1895 n.) Walker, Walker (Walker 1859, 1859 , 1859) comb Schaus 191 =S. (=S Hampson (Lederer 1863) (Druce 1895) Grote Robinson 1867, 1867 1867) Guenée, Guenée (Guenée 1854, 1854 1854) Becker sp Mexico Brazil Dognin 1905 stat rev revalidated N 1956 Warren 1890 H Fabricius, Fabricius (Fabricius 1775 B =B Dyar 1917 n.. . (Dyar 1914, 1914 1914) Syllepte. Syllepte] here 18 186 195 =P 189 185 19 =S 190 177 17

https://doi.org/10.1590/1806-9665-rbent-2022-0093

Notes and synonymy on the Neotropical moth genus Xylodonta Becker (Notodontidae, Nystaleinae), with special reference to the species occurring in Brazil
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Becker, Vitor Osmar

Revista Brasileira de Entomologia

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2021, Volume 65 Nº 2 elocation e20210006

Resumo: En | Texto: En | PDF: En

ABSTRACT The Notodontidae genus Xylodonta Becker, 2014 is represented by 20 species, five of them new, four from Brazil: X. giffordi sp. n., X. imitans sp. n., X. ochreibasis sp. n., and X. robustoides sp. n.; and one from Guatemala: X. monzoni sp. n.; one species: X. pythia (Druce, 1894) stat. rev., is removed from the synonymy with X. xylinata (Walker, 1865), three: X. placida (Schaus, 1911) syn. n. and X. riparia (Druce, 1906) syn. n. (=X. guarana (Schaus, 1892)) and X. patrickgoodwilliei Chacón, 2017 syn. n. (=X. xylinata (Walker, 1865)) are synonymized; and one: N. russula (Dognin, 1909) comb. n. is transferred to Nycterotis Felder. Diagnosis and illustrations of adults and genitalia of all species recorded from Brazil are provided to allow their identification.

https://doi.org/10.1590/1806-9665-rbent-2021-0006 301 downloads

Molecular identification of Dermatobia hominis (Diptera: Oestridae): a neglected agent causing myiasis in Mexico
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Lozano-Sardaneta, Yokomi N.

; Sánchez-Montes, Sokani

; Fernández-Figueroa, Edith

; Rangel-Escareño, Claudia

; Becker, Ingeborg

Revista do Instituto de Medicina Tropical de São Paulo

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2020, Volume 62 elocation e47

Resumo: En | Texto: En | PDF: En

ABSTRACT Myiasis represents a group of neglected tropical diseases caused by the infestation of vertebrate tissues by dipterous larvae. We herein report an imported case of foruncular myasis caused by Dermatobia hominis in Mexico City. The species was confirmed by DNA sequencing and phylogenetic reconstruction analysis.

https://doi.org/10.1590/s1678-9946202062047 346 downloads

Prevalence of the most common pathogenic variants in three genes for inborn errors of metabolism associated with sudden unexpected death in infancy: a population-based study in south Brazil
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Randon, Dévora N.

; Sperb-Ludwig, Fernanda

; Vianna, Fernanda S. L.

; Becker, Ana P. P.

; Vargas, Carmen R.

; Sitta, Angela

; Sant’Ana, Alexia N.

; Schwartz, Ida V. D.

; Bitencourt, Fernanda H. de

Genetics and Molecular Biology

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2020, Volume 43 Nº 3 elocation 20190298

Resumo: En | Texto: En | PDF: En

Abstract Citrullinemia type 1 (CTLNI), long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency (LCHADD), and mut0 methylmalonic acidemia (mut0 MMA) are inborn errors of metabolism (IEMs) associated with sudden unexpected death in infancy (SUDI). Its most common pathogenic variants are: c.1168G>A (CTLNI, ASS1 gene), c.1528G>C (LCHADD, HADHA gene), c.655A>T and c.1106G>A (mut0 MMA, MUT gene). Considering the absence of estimates regarding the incidence of these diseases in Brazil, this study sought to investigate the prevalence of its main pathogenic variants in a healthy population in the southern region of the country. A total of 1,000 healthy subjects from Rio Grande do Sul were included. Genotyping was performed by real-time PCR. Individuals found to be heterozygous for c.1528G>C underwent further acylcarnitine profile analysis by tandem mass spectrophotometry. Allele and genotype frequencies were calculated considering Hardy-Weinberg equilibrium. The c.1528G>C variant was detected in heterozygosity in two subjects (carrier frequency = 1:500; allele frequency = 0.001; minimum prevalence of LCHADD = 1: 1,000,000), whose acylcarnitine profiles were normal. Variants c.1168G>A, c.655A>T, and c.1106G>A were not identified. These results denote the rarity of these IEMs in Southern Brazil, highlighting the need to expand the investigation of IEMs in relation to infant morbidity and mortality within the country.

https://doi.org/10.1590/1678-4685-gmb-2019-0298 803 downloads

BIOSSENSOR ELETROQUÍMICO BASEADO NA ENZIMA TIROSINASE PARA A DETERMINAÇÃO DE FENOL EM EFLUENTES
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Oliveira, Dejane P. C. de

; Ribeiro, Francisco W. P.

; Becker, Helena

; Lima-Neto, Pedro

; Correia, Adriana N.

Química Nova

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Ago 2015, Volume 38 Nº 7 Páginas 924 - 931

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

AbstractThis work describes the development of a biosensor based on the tyrosinase enzyme (Tyr) for the determination of phenol (PHEN) in laboratory effluent samples derived from ammoniacal nitrogen analysis of the water samples from the Muquém dam in the city of Cariús, CE, using square-wave voltammetry (SWV). The electrode modification consisted of the immobilization of gold nanoparticles, multi-walled carbon nanotubes, cobalt phthalocyanine, and Tyr on a glassy carbon electrode. The electrolyte, pH, enzyme quantity, and voltammetric parameters were optimized to detect PHEN. The analytical curves presented a linear range from 4.97 × 10-6 mol L-1 to 6.10 × 10-5 mol L-1, and the detection limit (DL) and quantitation limit (QL) values were 4.81 × 10-6 mol L-1 and 4.97 × 10-6mol L-1, respectively. The repetition of measurements with the same biosensor and repetition for three other prepared biosensors exhibited a relative standard deviation (RSD) of 5.50 and 1.75%, respectively. The percentage recovery of PHEN in effluent samples varied from 86.40 to 105.04%. The stability of the biosensor was evaluated (at 21 days) with satisfactory results, showing 97.86% of the initial response. Moreover, the DL and recovery percentages agreed with the established values from CONAMA and ABNT, respectively. Thus, the electrode configuration developed seems a promising tool in the detection and quantification of PHEN in complex samples.

https://doi.org/10.5935/0100-4042.20150086 2177 downloads

KPC-producing Enterobacter aerogenes infection
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Tuon, Felipe F.

; Scharf, Camila

; Rocha, Jaime L.

; Cieslinsk, Juliette

; Becker, Guilherme Nardi

; Arend, Lavinia N.

Brazilian Journal of Infectious Diseases

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Jun 2015, Volume 19 Nº 3 Páginas 324 - 327

Resumo: En | Texto: En | PDF: En

Background: Enterobacteris a common nosocomial microorganism and its carbapenem's resistance has increased. The management of these cases is unclear.Objective: We evaluated 16 patients with KPC-producing Enterobacter aerogenesinfections, detailing the site of infection, therapy, clinical and epidemiological data.Methods: A retrospective and descriptive study. Clinical data were revised and KPC-2 detection was by molecular methods. Risk factors associated with mortality were compared using appropriate tests according to variable type with a significance level of 0.05.Results: The 30-day mortality rate was 37.5% with no association with inadequate treatment. Age (p= 0.004) and Charlson score of comorbidities (p= 0.048) were independent risk factors associated with death in the multivariate analysis. The odds ratio for age >43 years was 3.00 (95% CI: 1.02-9.32) and for Charlson score >3 was 2.00 (95% CI: 1.08-3.71). Five strains were pan-resistant based on automated susceptibility tests. All patients were treated with monotherapy.Conclusion: The clinician should be alert to carbapenem-resistant Enterobacteriaceaeinfection in older patients with comorbidities. The mortality is high and we believe that prompt and adequate therapy must be employed.

https://doi.org/10.1016/j.bjid.2015.01.003 1688 downloads

Direct electrochemical analysis of dexamethasone endocrine disruptor in raw natural waters
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Oliveira, Thiago M. B. F.

; Ribeiro, Francisco W. P.

; do Nascimento, Jefferson M.

; Soares, Janete E. S.

; Freire, Valder N.

; Becker, Helena

; Lima-Neto, Pedro de

; Correia, Adriana N.

Journal of the Brazilian Chemical Society

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Jan 2012, Volume 23 Nº 1 Páginas 110 - 119

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Este trabalho descreve uma metodologia eletroanalítica, utilizando voltametria adsortiva de onda quadrada, que foi aplicada com êxito na determinação direta de resíduos de dexametasona em águas naturais brutas utilizadas no abastecimento público do Estado do Ceará, Brasil. Os limites de detecção obtidos variaram entre 7,47 × 10-9 e 1,80 × 10-8 mol L-1 para as três matrizes de águas naturais brutas avaliadas. Os valores percentuais médios de recuperação (98,86% ± 0,72), repetibilidade (0,32% ± 0,05) e reprodutibilidade (0,91% ± 0,20) foram significativos, reafirmando a sensibilidade do procedimento. A energia dos orbitais LUMO e as cargas atômicas de Mülliken foram calculadas usando o funcional BLYP/DNP. Os resultados teóricos, aliados aos critérios de diagnóstico da voltametria de onda quadrada, indicam que o mecanismo redox da dexametasona está associado a processos de redução quase-reversível e irreversível dos grupos cetona localizados em C-20 e C-3, respectivamente.

This paper describes an electroanalytical methodology using square-wave adsorptive voltammetry, which has been successfully applied for the direct determination of dexamethasone residues in raw natural waters used for the public supply of the Ceará State, Brazil. The obtained detection limits ranged from 7.47 × 10-9 to 1.80 × 10-8 mol L-1 for the three matrices of raw natural waters evaluated. High percentages of average recovery (98.86% ± 0.72), repeatability (0.32% ± 0.05) and reproducibility (0.91% ± 0.20) were obtained in these samples, reaffirming the sensitivity of the procedure. Energy of the LUMO orbitals and Mülliken’s atomic charges were calculated using the functional BLYP/DNP. The theoretical results allied to the diagnostic criteria of the square-wave voltammetry indicate that the dexamethasone redox mechanism is associated to the quasi-reversible and irreversible reduction process of the ketone groups located at C-20 and C-3, respectively.

2422 downloads

A comparison of two cases of low-latitude thundersnow
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DOLIF NETO, G.

; MARKET, P. S.

; BECKER, A. E.

; PETTEGREW, B.

; MELICK, C.

; SCHULTZ, C.

; BUCKLEY, P. I.

; CLARK, J. V.

; LUPO, A. R.

; HOLLE, R.

; DEMETRIADES, N.

; BARBIERI, C. E.

Atmósfera

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Jul 2009, Volume 22 Nº 3 Páginas 315 - 330

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Two cases of low-latitude snow with lightning are studied to determine their characteristics. Both cases had synoptic-scale origins, but also featured smaller-scale influences (e. g. orographic lift and elevated instability). The first event occurred in the Southern Hemisphere and was a late winter case that developed under the influence of underlying orography. Lightning was plentiful in that event (94 cloud-to-ground flashes in the region), but snow accumulations were not significant. Lightning flashes of negative polarity dominated this case, with a mean peak amplitude of -43.2 kA. The second event was a Northern Hemisphere case of elevated convection, with frontogenesis beneath an extended layer of potential instability. Appreciable lightning occurred with this event as well (706 cloud-to-ground flashes in the region), and snow accumulations were significant over a broad area. Lightning flashes of negative polarity dominated this case also, with a mean peak amplitude of -23.7 kA. Each of these events is worthy of further scrutiny, as studies of such storms do not appear often in the literature. Indeed, such warm, subtropical regions are often unprepared for the effects of just a little snow or ice accumulation. Future forecasters can anticipate better such anomalous events by looking for these broad features: 1) significant and well-defined synoptic-scale weather systems at low latitudes, 2) a strong baroclinic zone with a well-defined (>60 ms-1) jet structure aloft, 3) cold air of appreciable depth and areal extent drawn much closer to the equator than is typical, and 4) a moist neutral to conditionally unstable layer above the frontal zone.

Se examinan dos eventos de nevada con relámpagos en latitudes bajas a fin de identificar sus características. Ambos eventos se originaron a escala sinóptica y tuvieron impactos de pequeña escala (por ejemplo, ascenso orográfico e inestabilidad elevada). El primer evento ocurrió en el hemisferio sur y se desarrolló a finales del invierno influenciado por la orografía subyacente. Este evento presentó abundancia de relámpagos (94 destellos nube-suelo en la región); sin embargo, la acumulación de nieve fue insignificante. Este evento fue dominado por relámpagos con polaridad negativa, con una amplitud máxima promedio de -43.2 kA. El segundo evento fue un caso de convección elevada en el hemisferio norte con frontogénesis debajo de una capa extensa de inestabilidad potencial. Este evento también presentó abundantes relámpagos (706 destellos nube-suelo en la región), así como considerable acumulación de nieve sobre un área extensa. Este evento también fue dominado por relámpagos con polaridad negativa, con una amplitud máxima promedio de -23.7 kA. Ambos eventos ameritan mayor investigación dado que estudios sobre tormentas similares no son abordados frecuentemente en la literatura. Más aún, teniendo en consideración que las regiones cálidas sub-tropicales usualmente no están preparadas para enfrentar ni siquiera los efectos de pequeñas acumulaciones de nieve o hielo. En el futuro, los pronosticadores pueden anticipar mejor estos eventos anómalos observando las siguientes características generales: 1) sistemas climáticos sinópticos significativos y bien definidos enbajas latitudes; 2) una zona baroclínica fuerte con estructura de chorro superpuesta bien definida (>60 ms-1); 3) una extensión considerable y profunda de aire frío más próximo al ecuador de lo típico; y 4) una capa con humedad neutral a inestabilidad condicional sobre la zona frontal.

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10.

A review of the New World Atteva Walker moths (Yponomeutidae, Attevinae)
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Becker, Vitor O.

Revista Brasileira de Entomologia

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2009, Volume 53 Nº 3 Páginas 349 - 355

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

As species de Atteva Walker são revistas e ilustradas em cores. Um nome: A. pustulella (Fabricius), nom. rev. e três espécies: A. aurea (Fitch), sp. rev., A. floridana (Neumoegen), sp. rev. and A. gemmata (Grote), sp. rev. são restabelecidos; cinco nomes são considerados sinônimos recentes de A.aurea: Poeciloptera compta Clemens, syn. n., A. edithella Busck, syn. n., A. exquisita Busck, syn. n., A. ergatica Walsingham, syn. n. e A. microsticta Walsingham, syn. n.; quatro espécies novas são descritas: A. rawlinsi sp. n., da República Dominica, A. sidereoides sp. n., da Jamaica, A. entermedia sp. n., de Antigua, e A. zebrina sp. n., do Brazil; são designados lectótipos para A. floridana e A. glaucopidella (Guenée) (=fulviguttata).

The New World species of Atteva Walker are reviewed and illustrated in colour. One name: A. pustulella (Fabricius), nom. rev. and three species: A. aurea (Fitch), sp. rev., A. floridana (Neumoegen), sp. rev. and A. gemmata (Grote), sp. rev. are reinstated; five names are synonymised under A. aurea: Poeciloptera compta Clemens, syn. n., A. edithella Busck, syn. n., A. exquisita Busck, syn. n., A. ergatica Walsingham, syn. n. and A. microsticta Walsingham, syn. n.; four new species are described: A. rawlinsi sp. n., from the Dominican Republic, A. sidereoides sp. n., from Jamaica, A. entermedia sp. n., from Antigua, and A. zebrina sp. n., from Brazil; lectotypes for A. floridana and A. glaucopidella (Guenée) (=fulviguttata) are also designated.

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11.

Three new cecidogenous Palaeomystella Fletcher (Lepidoptera, Coleophoridae, Momphinae) associated with Melastomataceae in Brazil
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Becker, Vitor O.

; Adamski, David

Revista Brasileira de Entomologia

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2008, Volume 52 Nº 4 Páginas 647 - 657

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

As espécies de Palaeomystella aqui descritas induzem cecídeas nos ramos e folhas de espécies de Melastomataceae: Palaeomystella tibouchinae sp. n. em Tibouchina barbigera (Naudin) Baillon, P. oligophaga sp. n. em Macairea radula (Bonpland) de Candolle, e M. thyrsiflora de Candolle, P. henriettiphila sp. n. em Henriettea succosa (Aublet) de Candolle. Os adultos, incluindo venação das asas, e genitálias dos machos e fêmeas, larvas, pupas e cecídeas, são descritos e ilustrados em detalhes.

Three new cecidogenous Palaeomystella Fletcher (Lepidoptera, Coleophoridae, Momphinae), described herein, induce galls on stems and leaves of Melastomataceae species. They include: Palaeomystella tibouchinae sp. n., on Tibouchina barbigera (Naudin) Baillon, P. oligophaga sp. n., on Macairea radula (Bonpland) de Candolle and M. thyrsiflora de Candolle, and P. henriettiphila sp. n., on Henriettea succosa (Aublet) de Candolle. Adults, including male and female genitalia, larva, pupa, and galls are illustrated and described in detail.

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12.

Estrutura de comunidades de pequenos mamíferos e densidade de Necromys lasiurus (Rodentia, Sigmodontinae) em áreas abertas de cerrado no Brasil Central
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Becker, Rafael G.

; Paise, Gabriela

; Baumgarten, Leandro C.

; Vieira, Emerson M.

Mastozoología neotropical

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Dez 2007, Volume 14 Nº 2 Páginas 157 - 168

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Investigamos comunidades de pequenos mamíferos de Cerrado em formações vegetais abertas do Parque Nacional de Emas (PNE), no Brasil Central. Amostramos 10 áreas que representavam as principais variações fisionômicas das áreas abertas do PNE. Avaliamos variações entre áreas na abundância, riqueza de espécies e densidade da espécie de pequeno mamífero mais comum na região (Necromys lasiurus). Amostramos no total 10 áreas usando armadilhas dispostas em linhas de captura. Em uma das áreas utilizamos o método de Linhas de Verificação para estimar a densidade de N. lasiurus. Com um esforço de 1440 armadilhas-noite, capturamos 180 indivíduos, cinco roedores e dois marsupiais. Necromys lasiurus representou 86.7 % do total de indivíduos e foi a única espécie presente em oito das dez áreas amostradas, estando ausente apenas nas áreas úmidas. Clyomys laticeps foi a segunda espécie mais freqüente, ocorrendo em quatro áreas e representando 3.9% do total de indivíduos capturados. Uma Análise de Correspondência não indicou uma separação clara entre as áreas amostradas nas duas épocas e agrupou os campos úmidos, influenciados pela captura do roedor Oxymycterus delator e do marsupial Lutreolina crassicaudata. Não houve diferença significativa entre os sucessos de captura das duas épocas. No entanto, capturamos significativamente mais jovens de N. lasiurus no auge da estação chuvosa do que na época de transição. A densidade estimada dessa espécie no período de transição entre estações, de 19.02 ind/ha, foi alta em comparação com outras áreas de Cerrado. O presente estudo indicou que as áreas abertas do PNE possuem comunidades de pequenos mamíferos semelhantes a formações similares em outras regiões de Cerrado

We investigated small-mammal communities of open Cerrado areas at the National Park of Emas (NPE), Central Brazil. Ten areas were sampled representing the full range of physiognomic forms of open areas at the NPE. Variation among areas in abundance, species richness, and also density of the most common small-mammal species in the region, were evaluated. The sampled areas were 4 in the dry-wet season and 6 in the rainy season, using traps forming lines. In one area we used the method of Assessment Lines to estimate N. lasiurus density. With an effort of 1440 trapping-nights we captured 180 individuals, five rodents and two marsupials. Necromys lasiurus represented 86.7% of total of captured individuals and was the only species captured in eight of 10 areas. Clyomys laticeps was the second most frequent species, occurring in four areas. A Correspondence Analysis did not show clear differences among areas but grouped the wet-grassland areas, which were dominated by the rodent Oxymycterus delator and the marsupial Lutreolina crassicaudata. We also did not detect significance difference in capture rates between seasons. However, we captured young N. lasiurus individuals significantly more in the rainy season than in the dry-wet season. The estimated density of this species by the beginning of wet season was 19.02 ind/ha, which was high in comparison with other Cerrado areas. The present study indicated that open areas of the NPE harbor small-mammal communities similar to open areas of other Cerrado regions.

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13.

A C-type lectin from Bothrops jararacussu venom can adhere to extracellular matrix proteins and induce the rolling of leukocytes
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Elífio-Esposito, S. L.

; Hess, P. L.

; Moreno, A. N.

; Lopes-Ferreira, M.

; Ricart, C. A. O.

; Souza, M. V.

; Hasselman-Zielinski, F.

; Becker, J. A.

; Pereira, L. F.

Journal of Venomous Animals and Toxins including Tropical Diseases

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2007, Volume 13 Nº 4 Páginas 782 - 799

Resumo: En | Texto: En | PDF: En

Purification of a lectin from Bothrops jararacussu venom (BjcuL) was carried out using agarose-D-galactose affinity gel. MALDI-TOF gave a major signal at m/z 32028, suggesting the presence of a dimmer composed of two identical subunits. Divalent cations were required for the lectin activity, as complete absence of such ions reduced hemagglutination. BjcuL was more effective at neutral pH and showed total loss of activity at pH values below 4.0 and above 9.0. Its agglutinating activity remained stable at 25°C until 60min, but increased when at 35°C for at least 15min. Adhesion assays to extracellular matrix (ECM) glycoproteins showed that the biotinylated lectin (0.039-5.0µg/100µl) was capable of binding to fibronectin and vitronectin in a dose-dependent manner. The binding was partially inhibited in the presence of D-galactose. BjcuL (1.25-10µg/30µl) potential was investigated for leukocyte rolling and adhesion to endothelial cells in living microvessels using intravital microscopy, which showed that it induced a dose-dependent increase in rolling and adherence of leukocytes, acting directly on endothelial cells of postcapillary venules. The specific association between lectins and their ligands, either on the cell surface or on the ECM, is related to a variety of biological processes. The complementary characterization of BjcuL, shown here, is useful to further understand the venom effects and as a background for future investigation for therapeutic strategies.

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14.

Recent results from PHOBOS at RHIC
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Back, B.B.

; Baker, M.D.

; Ballintijn, M.

; Barton, D.S.

; Becker, B.

; Betts, R.R.

; Bickley, A.A.

; Bindel, R.

; Budzanowski, A.

; Busza, W.

; Carroll, A.

; Decowski, M.P.

; García, E.

; Gburek, T.

; George, N.

; Gulbrandsen, K.

; Gushue, S.

; Halliwell, C.

; Hamblen, J.

; Harrington, A.S.

; Heintzelman, G.A.

; Henderson, C.

; Hofman, D.J.

; Hollis, R.S.

; Hoynski, R.

; Holzman, B.

; Iordanova, A.

; Johnson, E.

; Kane, J.L.

; Katzy, J.

; Khan, N.

; Kucewicz, W.

; Kulinich, P.

; Kuo, C.M.

; Lee, J.W.

; Lin, W.T.

; Manly, S.

; McLeod, D.

; Mignerey, A.C.

; Nouicer, R.

; Olszewski, A.

; Pak, R.

; Park, I.C.

; Pernegger, H.

; Reed, C.

; Remsberg, L.P.

; Reuter, M.

; Roland, C.

; Roland, G.

; Rosenberg, L.

; Sagerer, J.

; Sarin, P.

; Sawicki, P.

; Sedykh, I.

; Skulski, W.

; Smith, C.E.

; Steinberg, P.

; Stephans, G.S.F.

; Sukhanov, A.

; Tang, J.- L.

; Tonjes, M.B.

; Trzupek, A.

; Vale, C.

; Nieuwenhuizen, G.J.van

; Verdier, R.

; Veres, G.I.

; Wolfs, F.L.H.

; Wosiek, B.

; Wozniak, K.

; Wuosmaa, A.H.

; Wysouch, B.

; Zhang, J.

Brazilian Journal of Physics

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Set 2004, Volume 34 Nº 3a Páginas 829 - 832

Resumo: En | Texto: En | PDF: En

PHOBOS is one of the four heavy ion experiments currently running at the Relativistic Heavy Ion Collider (RHIC). In this paper we will present some of the current results from PHOBOS: the study of charged multiplicity distribution as function of pseudorapidity and centrality at <IMG SRC="/img/revistas/bjp/v34n3a/a32img01.gif" > or = 19.6, 130 and 200 GeV, a discussion of multiplicity scaling, and a measurement of transverse momentum spectra (pT) of charged hadrons produced in d+Au and Au+Au interactions at <IMG SRC="/img/revistas/bjp/v34n3a/a32img01.gif" > or = 200 GeV. The dependence of the Au+Au yields as function of centrality is found to be independent of pT. A strong suppression in the Au+Au hadron spectra relative to p<IMG SRC="/img/revistas/bjp/v34n3a/a32img05.gif"> at high pT is observed. The spectral shape for d+Au collisions is significantly different from the observations in Au+Au, the yield suppression is not observed in d+Au.

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15.

Land cover and conservation state of a region in the Southern limit of the Atlantic Forest (river Maquiné basin, Rio Grande do Sul, Brazil)
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Becker, F. G.

; Irgang, G. V.

; Hasenack, H.

; Vilella, F. S.

; Verani, N. F.

Brazilian Journal of Biology

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- Sobre o periódico
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Ago 2004, Volume 64 Nº 3b Páginas 569 - 582

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

O estado de conservação da Mata Atlântica na bacia do rio Maquiné foi avaliado com base em dados de uso do solo. As categorias de uso do solo foram identificadas a partir de uma imagem do satélite Landsat TM 5, de outubro de 1995. Inicialmente, a análise considerou a distribuição espacial das áreas relativas de cada tipo de uso do solo em relação às classes de declividade do terreno e às zonas de vegetação potencial em uma faixa ripária de 90 m. Posteriormente, os tipos de uso do solo foram reagrupados em categorias conforme o grau de antropização que representam: alto, intermediário e baixo. Os resultados indicam que cerca de 70% da área da bacia do rio Maquiné está, ou já foi, altamente alterada pela substituição da cobertura florestal por agricultura. Atualmente, parece haver um processo de recuperação da vegetação, uma vez que amplas áreas estão ocupadas por vegetação secundária em estádios sucessionais intermediários (34,8%) ou avançados (20,2%), particularmente na região da Floresta Montana e das florestas situadas acima de 800 m de altitude (Floresta Ombrófila Mista e Formação Alto Montana da Floresta Ombrófila Densa). A localização geográfica no extremo meridional da Mata Atlântica stricto sensu e a comparação com dados sobre o estado de conservação da Mata Atlântica no Rio Grande do Sul indicam que a bacia do rio Maquiné é uma importante área do ponto de vista de conservação. Alguns aspectos referentes à pesquisa científica e ao manejo também são discutidos.

The state of conservation of Atlantic Forest in the Maquiné river basin was assessed using land cover data obtained from Landsat TM 5 satellite imagery (October 1995). The initial analysis examined the distribution of the relative areas of each land-cover type according to landscape slope classes, potential vegetation zones, and a 90 m riparian buffer. Land-cover classes were then regrouped into categories representing "low", "intermediate", and "high" degree of anthropogenic alteration. Results indicate that about 70% of the land cover of the Maquiné river basin has been highly altered as a consequence of replacement of natural forests by agriculture. Presently, a recovery process seems to be underway, contrasting with the historical trend towards deforestation. There are large areas of secondary vegetation in intermediate (34.8%) and advanced successional stages (20.2%), particularly across the range of the montane forest and of forest formations that occur at elevations higher than 800 m (high-montane dense ombrophilous forest and mixed ombrophilous forest). The geographical location at the southern limit of the Atlantic Forest stricto sensu and comparison of the results with data on the state of conservation of the Atlantic Forest in Rio Grande do Sul indicate that the Maquiné river basin is an important area for conservation. Some points regarding future research and conservation management are also discussed.

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