Publicações - ciências exatas e da terra
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D?OCA, CAROLINE DA ROS MONTES;
MASS, EDUARDO BUSTOS;
ONGARATTO, RENATA FONTES;
DE ANDRADE, ARTHUR MOTTA;
Marcelo Gonçalves Montes D'Oca;
RUSSOWSKY, DENNIS
Palavra-chave:
(+/-)-Pregabalin;
ácido gama-aminobutírico (GABA);
Fatty derivatives;
lipophilic drugs
Áreas do conhecimento:
Ciências Exatas e da Terra; Química Orgânica; Síntese Orgânica;
Ciências Exatas e da Terra; Química; Química Orgânica; Síntese Orgânica;
Ciências Exatas e da Terra; Química; Quimica Medicinal
resumo ...
In this work, were synthesized for the first time a series of new lipophilic β-alkyl substituted GABA derivatives from fatty alkyl chains. The synthesis of these GABA analogues was investigated by two different bicomponent approaches as a key step. The results showed low yields in the path from aliphatic nit
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PROLA, LIZIÊ;
BACH-TOLEDO, LARISSA;
SCHULTZ, JULIANA;
Antonio Savio Mangrich;
PERALTA-ZAMORA, PATRICIO
Palavra-chave:
Heterogeneous photocatalysis;
Chitosan;
amorphous graphene-ike carbon;
carbonization;
pharmaceuticl degrdation
Áreas do conhecimento:
Ciências Exatas e da Terra; envoiromental
resumo ...
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CUPELLO, MARIO;
Cibele Stramare Ribeiro-Costa;
VAZ-DE-MELLO, FERNANDO Z.
Palavra-chave:
Scarabaeini;
Streblopus;
Systematic
Áreas do conhecimento:
Ciências Biológicas; Zoologia; Taxonomia dos Grupos Recentes;
Ciências Exatas e da Terra; Química; Química Orgânica; Evolução, Sistemática e Ecologia Química
resumo ...
(en)
Streblopus Van Lansberge, 1874 has been one of the most mysterious dung beetle groups of the Neotropical fauna, having a rather peculiar morphology, very few known specimens in collections and a difficult placement among the scarabaeine lineages. In this work, based on the examination of a recently collected series of specimens and a synthesis of some scattered, but deeply valuable, information available in the literature, we readdress many of the questions posed by past authors. It is shown that Streblopus is a relict genus composed of two currently living species of widely disjunct distribution, namely S. opatroides Van Lansberge, 1874, from patches of Atlantic Forest in the Brazilian states of Bahia and Espírito Santo, and S. punctatus (Balthasar, 1938), known from a few localities across Sub-Andean humid forests in the Peruvian and Ecuadorian Amazon Forest. We redescribe both and present in detail the evidence pointing to their validity as two independent species; a discussion of their remarkable sexual dimorphism is also given. The biogeography of Streblopus in South America is addressed, and we conclude that the present disjunct distribution of the genus is a consequence of the retreat of the tropical forest corridors that once connected the Atlantic Forest to the Amazon Basin through the South American Dry Diagonal during several periods of the Neogene, particularly until the Middle Miocene. Finally, we propose an African origin for the genus based on its close phylogenetic relationship with a group of Old World taxa ‒ particularly Circellium Latreille, 1825 and Scarabaeini. Having diverged from those groups in the late Upper Cretaceous, we argue that the ancestor of Streblopus arrived in South America crossing the Atlantic Ocean by rafting. We present a synthesis of data from a wide variety of biological groups to support our ideas and contend that long-distance dispersal hypotheses should be taken more seriously by scarab beetle specialists.
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Paula Nakayama;
Alberto Carvalho Peret;
Olímpio Rafael Cardoso;
Marcelo Renato Lamour;
Henry Louis Spach
Palavra-chave:
Fish assemblage;
Coastal area;
abiotic conditions
Áreas do conhecimento:
Ciências Exatas e da Terra; Oceanografia Biológica; Interação entre os Organismos Marinhos e os Parâmetros Ambientais
resumo ...
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DA SILVA, MAYCON R.;
Diogo Montes Vidal;
FIGUEIREDO, LEONARDO;
BANDEIRA, PAMELA T.;
BERGMANN, JAN;
Paulo Henrique Gorgatti Zarbin
Palavra-chave:
feromônios;
ecologia química
Áreas do conhecimento:
Ciências Exatas e da Terra; Química; Química Orgânica; Evolução, Sistemática e Ecologia Química
resumo ...
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Jackson Antonio do Prado Lima;
Silvia Regiina Vergilio
Palavra-chave:
Integração contínua;
Priorização de casos de teste
Áreas do conhecimento:
Ciências Exatas e da Terra; Ciência da Computação; Metodologia e Técnicas da Computação; Engenharia de Software
resumo ...
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Itamar Tomio Neckel;
NEY MATTOSO
Palavra-chave:
Eletrodeposição;
Ligas Magnéticas;
microscopia eletrônica de varredura
Áreas do conhecimento:
Ciências Exatas e da Terra; Física; Física da Matéria Condensada; Materiais Magnéticos e Propriedades Magnéticas;
Ciências Exatas e da Terra; Física; Física da Matéria Condensada; Superfícies e Interfaces; Películas e Filamentos;
Ciências Exatas e da Terra; Química; Físico-Química; Eletroquímica
resumo ...
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Daniel Arana;
CAMARGO, PAULO O.;
ÉDER CASSOLA MOLINA;
Denizar Blitzkow;
ANA CRISTINA OLIVEIRA CANCORO DE MATOS;
Jean-Paul Boy
Palavra-chave:
Gravity;
gPhone;
barometric admittance;
atmospheric loading
Áreas do conhecimento:
Ciências Exatas e da Terra; Geodésia; Fotogrametria;
Ciências Exatas e da Terra; Geociências; Geodésia; Geodésia Física
resumo ...
Terrestrial gravity stations have been in operation for several years throughout Brazil. Minimizing geophysical effects on gravimetric observations is a major challenge in the generation of solid Earth tide models. The objective of this work was to conduct an analysis of barometric information and the impact of four barometric correction methodologies on gravimetric data for two stations located in the state of São Paulo: Presidente Prudente and Cananeia. The proposed approach involves three steps: (1) the processing of gravimetric data in order to obtain preliminary Earth tide models, (2) the application of four methodologies for atmospheric loading correction, and (3) the analysis of the impact on each wave constituent. The results show that the observed Earth tide models have a standard deviation (SD) of 0.001 and 0.01° for gravimetric factors and phases, respectively. The impact on the application of different methodologies for minimizing the air mass overload was less than 1.5 nm/s2 for the observation residuals. In addition, for both stations, the residuals in Earth tide constituents showed greater sensitivity to different atmospheric corrections for P1 and S2, which is related to the higher intensity of diurnal and semidiurnal solar constituents.
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Kátia Cristina Molgero Westrup;
Francielli Sousa Santana;
D. L. Hughes;
NUNES, GIOVANA G.;
Jaisa Fernandes Soares;
Anne-Laure Barra;
Roberta Sessoli;
Lorenzo Sorace
Palavra-chave:
star-shaped;
tetranuclear;
Magnetic anisotropy;
high-field EPR;
Magnetic susceptibility;
Vanadium(III)
Áreas do conhecimento:
Ciências Exatas e da Terra; Física; Física da Matéria Condensada; Materiais Magnéticos e Propriedades Magnéticas;
Ciências Exatas e da Terra; Química; Química Inorgânica; Química de Coordenação;
Ciências Exatas e da Terra; Química; Físico-Química; Espectroscopia
resumo ...
We report here the synthesis and a preliminary characterization of the tetranuclear complex of formula [Ga3V(LEt)2(dpm)6], Ga3VEt, in which H3LEt = 2-Ethyl-2-(hydroxymethyl)-propane-1,3-diol and Hdpm = dipivaloylmethane, containing a single paramagnetic vanadium(III) center, from a structural, magnetic, and spectroscopic point of view. Structural characterization by X-ray diffraction evidenced that this derivative is isostructural with the star-shaped Single-Molecule Magnet [Fe3V(LEt)2(dpm)6], Fe3VEt, and can, thus, be considered a model to analyze the magnetic anisotropy of the vanadium(III) ion in that system. The observed results confirm the complexity in obtaining a rationalization of the magnetic behavior of this metal ion, with magnetization data and High Field Electron Paramagnetic Resonance (HF-EPR) spectroscopy providing apparently conflicting results. Indeed, the former were rationalized assuming a rhombic distortion of the ligand field and a dominant easy-axis type anisotropy (equivalent to D ≈ −14.1 cm−1, E ≈ 1.2 cm−1), while a simple axial Spin Hamiltonian approach could explain HF-EPR data (|D| ≈ 6.98 cm−1).
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Isis Armstrong;
Leonardo Fadel Cury;
Bruno Titon;
Gustavo Barbosa Athayde;
Guilherme Fedalto;
Larissa Santos;
ANA PAULA SOARES;
Camila de Vasconcelos Müller Athayde;
Anelise Manuela Bahniuk Rumbelsperger
Palavra-chave:
alkaline lakes;
clay minerals;
EPS;
chemical precipitation
resumo ...
Mg clay minerals are usually associated with carbonates in alkaline-saline environments, precipitated from solution and/or transformation from other minerals. The aim of this research is to identify the mineralogy and geochemistry of clay minerals in different alkaline lakes in the Nhecolândia region, the southernmost region of the Pantanal wetland (Brazil). Sediment samples were analyzed by X-ray diffraction, X-ray fluorescence, scanning electron microscopy and transmission electron microscopy. Water samples were analyzed, determining their main cations and anions, in order to understand their relationship with the clays. The analyses allowed classifying the water bodies as saline, oligosaline and freshwater lakes. The sediments are composed mainly of quartz and a fine-clay fraction, dominated by illite, kaolinite and smectite. The XRD results showed illite and smectite mixed-layered in the saline lakes at Barranco Alto farm, whereas at Nhumirim farm, trioctahedral smectite was only observed in one lake. The smectite minerals were normally identified coupled with calcite at the top of the sequences, associated with exopolymeric substances (EPS) in the lakes, suggesting that these minerals are precipitating due to the physical-chemical and biological conditions of the water bodies.
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