Publicações - ciências biológicas
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CARDOSO-GUSTAVSON, POLIANA;
DAVIS, ARTHUR R;
Cleusa Bona;
CAMPBELL, LISA M;
DE BARROS, FÁBIO
Palavra-chave:
anatomia floral;
Orchidaceae
Áreas do conhecimento:
Ciências Biológicas; Botânica; Morfologia Vegetal; Anatomia Vegetal
resumo ...
Abstract. Here we present a detailed description of the secretory tissues found in the gynostemium and ovary of species representing both early and late divergi
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MAROCHI, MZ;
Salise Brandt Martins;
Setuko masunari
Palavra-chave:
Experimentos;
estuário;
Baía de Guaratuba;
larvas de caranguejos
Áreas do conhecimento:
Ciências Biológicas; Ecologia de populações; Populações de caranguejos
resumo ...
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SACOMBOIO, EUCLIDES NENGA MANUEL;
KIM, EDSON YU SIN;
CORREA, HENRIQUE LEONARDO RUCHAUD;
BONATO, PALOMA;
PEDROSA, FABIO DE OLIVEIRA;
Emanuel Maltempi de Souza;
Leda Satie Chubatsu;
MÜLLER-SANTOS, MARCELO
Áreas do conhecimento:
Ciências Biológicas; Bioquímica dos Microorganismos; Enzimologia
resumo ...
The NTR system is the major regulator of nitrogen metabolism in Bacteria. Despite its broad and well-known role in the assimilation, biosynthesis and recycling of nitrogenous molecules, little is known about its role in carbon metabolism. In this work, we present a new facet of the NTR system in the control of NADPH concentration and the biosynthesis of molecules dependent on reduced coenzyme in Herbaspirillum seropedicae SmR1. We demonstrated that a ntrC mutant strain accumulated high levels of polyhydroxybutyrate (PHB), reaching levels up to 2-fold higher than the parental strain. In the absence of NtrC, the activity of glucose-6-phosphate dehydrogenase (encoded by zwf) increased by 2.8-fold, consequently leading to a 2.1-fold increase in the NADPH/NADP+ ratio. A GFP fusion showed that expression of zwf is likewise controlled by NtrC. The increase in NADPH availability stimulated the production of polyhydroxybutyrate regardless the C/N ratio in the medium. The mutant ntrC was more resistant to H2O2 exposure and controlled the propagation of ROS when facing the oxidative condition, a phenotype associated with the increase in PHB content.
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Gilsane Raquel Czlusniak;
Daniel Bonoto;
Eli Luis Namba;
Michele Santos Vianna Lara;
Maria Ângela Naval Machado;
Edvaldo Antonio Ribeiro Rosa;
TREVILATTO, Paula Cristina;
Luciana Reis de Azevedo Alanis
Palavra-chave:
Facial injuries;
Martial arts;
Injury prevention
Áreas do conhecimento:
Ciências Biológicas; Morfologia; Anatomia; Anatomia Humana
resumo ...
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FERREIRA, ANDRÉ DA SILVA;
Almeida, LM.;
BRAVO, FREDDY
Palavra-chave:
Neotropical region;
Rutelini;
Scarabaeoidea;
Taxonomy
Áreas do conhecimento:
Ciências Biológicas; Zoologia; Taxonomia dos Grupos Recentes
resumo ...
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PIECHNIK, CLÁUDIO ADRIANO;
HÖCKNER, MARTINA;
DE SOUZA, MARIA ROSA DMENGEON PEDREIRO;
Donatti, Lucélia;
TOMANEK, LARS
Palavra-chave:
Antarctica;
Nacella concinna
Áreas do conhecimento:
Ciências Biológicas; Bioquímica dos Microorganismos; Enzimologia;
Ciências Biológicas; Ecologia; Ecologia de Ecossistemas
resumo ...
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DISNER, GEONILDO RODRIGO;
CALADO, SABRINA LOUISE MORAES;
SILVA ASSIS, HELENA CRISTINA;
Cestari, M.M.
Palavra-chave:
peixe;
Acará;
Lambari;
micronúcleo;
ensaio cometa;
Enzimas
Áreas do conhecimento:
Ciências Biológicas; Mutagenese; Mutagênese Em Peixes;
Ciências Biológicas; Genética; Genotoxicidade em Peixes;
Ciências Biológicas; Farmacologia; toxicidade em peixes
resumo ...
(en)
Polycyclic aromatic hydrocarbons are one of the most important organic pollutants in environmental studies. The aim of this study was to assess the naphthalene acute toxicity in two fish species, Astyanax lacustris (LLcust, 1875) and Geophagus brasiliensis (Quoy & Gaimard, 1824). The fish were exposed to naphthalene (0.005, 0.03, 0.3, and 3 mgL-1) in water and after that the piscine micronucleus test in erythrocytes, comet assay in blood, liver and gill cells, glutathione S–transferase (GST) activity in the liver, and accumulation of naphthalene in the bile were performed. The susceptibility of the two species was similar and naphthalene was not genotoxic in all tested tissues. The liver GST activity may have been responsible for less damage observed in the liver while the highest DNA damage occurred in blood cells. However, low concentrations of naphthalene in water can stimulate apparent benefits, such as less DNA damage, which would be a compensatory response to an imbalance of homeostasis. The naphthalene is absorbed and can accumulate in the gall bladder, a greater accumulation of PAH was observed in A. lacustris, while G. brasiliensis did not differ from the control. The naphthalene concentrations are not genotoxic to the tested species, although they can potentially accumulate into the body.Keywords: Comet assay. Ecotoxicology. Fish. Genotoxicity. Hormesis.
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MIRANDA, RENATA RANK;
BEZERRA JR, ARANDI GINANE;
OLIVEIRA RIBEIRO, CIRO ALBERTO;
M. A. F. Randi;
VOIGT, CARMEN LÚCIA;
SKYTTE, LILIAN;
RASMUSSEN, KAARE LUND;
KJELDSEN, FRANK;
Filipak Neto, Francisco
Palavra-chave:
HepG2 cells;
silver nanoparticles;
mercury;
cadmiun;
co-exposure;
Interaction
Áreas do conhecimento:
Ciências Biológicas; Morfologia; Citologia e Biologia Celular
resumo ...
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Alexandre Cruz Domahovski;
Rodney Ramiro Cavichioli
Palavra-chave:
Aucehnorrhyncha;
Hecalapona complex;
Iassinae;
leafhoppers;
Neotropical region
Áreas do conhecimento:
Ciências Biológicas; Zoologia; Taxonomia dos Grupos Recentes
resumo ...
(en)
Kalopona is a small genus with five species distributed in Brazil, Colombia and Mexico. Two new Brazilian species of Kalopona Freytag, 2015 are described and illustrated: K. insigna sp. nov., from Amazonas and K. sagytta sp. nov., from Mato Grosso. A key to the seven known species of Kalopona is presented.
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Renato Goldenberg;
HINOSHITA, LUCAS KATSUMI ROCHA
Áreas do conhecimento:
Ciências Biológicas; Taxonomia Vegetal; Taxonomia de Fanerógamos
resumo ...
Two new species of Miconia from northern Amazonia area described. Miconia amapaënsis has been collected in the Brazilian state of Amapá and in nearby locations in northern Pará and southern French Guiana. It has remarkable seeds, with both the appendix and seed coat covered with long papillae. Miconia forzzae has been collected on the Brazilian side of the Neblina Massif, in the Brazilian state of Amazonas, close to the border with Venezuela. It has 4-merous flowers, with a terete hypanthium, yellow stamens, the ovary apex with unbranched trichomes, and a punctiform stigma. This species may be endangered, considering its narrow distribution, and the fact that it was collected between 2000 and 2100 m elevation in an isolated mountain range with no neighboring mountains with similar height, but we assess its conservation status as “data deficient”, due to a lack of knowledge on the situation of the populations and the number of individuals.
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