Publicações - ciências exatas e da terra
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DE VINCENZI WEIRICH, YASMYM SCHUTZ;
Machado, Eunice C.;
CARLOS, LUIZ COTOVICZ;
ROCHA, ELIS BRANDÃO;
MUNIZ, MARCELO COSTA;
DOS ANJOS, ROBERTO MEIGIKOS;
MENDES, CARLOS RAFAEL BORGES;
KERR, RODRIGO
Palavra-chave:
Stable carbon isotopes;
Dissolved inorganic carbon;
Southern Ocean;
biogeochemical processes
Áreas do conhecimento:
Ciências Exatas e da Terra; BIOGEOQUÍMICA MARINHA
resumo ...
Bransfield Strait has been identified as a climate hotspot for understanding regional environmental changes with global impact. This study focuses on enhancing the understanding of carbon cycle dynamics and its interactions with hydrographic variables in Bransfield Strait, located on the northern Antarctic Peninsula. The stable carbon isotopes of dissolved inorganic carbon (δ13CDIC) were investigated in the study region during comprehensive sampling in 2023 along the major ocean basins. Bransfield Strait is influenced by two main source water masses: the Circumpolar Deep Water (CDW), which intrudes into the region from the Antarctic Circumpolar Current meander, and Dense Shelf Water (DSW), which is advected by coastal currents from the Weddell Sea continental shelf. The study reveals CDW’s dominant role in 2023, accounting for ~60% of the water mass mixture in the region and limiting the highest contribution of DSW to the deep layer of the central basin. The spatial variation of δ13CDIC signatures showed that biogeochemical processes predominantly shape the δ13CDIC distribution along the water column. Photosynthesis enriched the surface waters with the heavier carbon isotope, with signatures ranging from 2 to 1.5‰, while organic matter remineralization depleted it below the mixed layer (ranging from 0 to − 2‰). Horizontally, δ13CDIC distribution was influenced by the higher contribution of each source water mass. Thermodynamic fractionation contributed to the enrichment of δ13CDIC (~ 1 to 1.5‰) in the CDW layer in Bransfield Strait. Conversely, the predominance of younger and colder DSW exhibited a depletion of δ13CDIC (− 1 to − 2‰). Therefore, δ13CDIC is identified as an additional tracer to provide new insights into the biogeochemical and hydrodynamic processes of Bransfield Strait.
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DE FREITAS BATISTA, MARCELLE GUTH;
HERBST, GIULIA;
M. B. KOLICHESKI;
VOLL, FERNANDO A.P.;
CORAZZA, MARCOS L.
Palavra-chave:
TERPENOS;
limoneno;
extração
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Telecomunicações;
Engenharias; Engenharia Química; Engenharia de Separações e Termodinâmica;
Ciências Exatas e da Terra; Química; Química Orgânica; Química dos Produtos Naturais
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Malton Carvalho Fraga;
Cristina Silveira Vega
Palavra-chave:
taphonomy;
Echinodermata
Áreas do conhecimento:
Ciências Exatas e da Terra; Geociências; Meteorologia; Meteorologia Dinâmica
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Alexandre Kirilov;
Wagner Augusto Almeida de Moraes.;
TOKORO, PEDRO MEYER
Palavra-chave:
Vekua-type operators;
Denjoy-Carleman classes;
Global Solvability;
Global Hypoellipticity
Áreas do conhecimento:
Ciências Exatas e da Terra; Matemática; Análise; Equações Diferenciais Parciais
resumo ...
Alexandre Kirilov, Wagner Augusto Almeida de Moraes, Pedro Meyer Tokoro
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ESTEVAM, VALTER;
LAROCA, RAYSON;
Hélio Pedrini;
MENOTTI, DAVID
Áreas do conhecimento:
Ciências Exatas e da Terra; Ciência da Computação; Metodologia e Técnicas da Computação; Engenharia de Software
resumo ...
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R. BRITO, BIANCA;
G. FACHINI, LUCAS;
POSTAL, KAHOANA;
R. BOTTINI, RÚBIA CAMILA;
L. DE SÁ, EDUARDO;
F. ZAWADZKI, SÔNIA;
Giovanna G Nunes
Palavra-chave:
polyoxovanadates;
mixed-valence;
PVC;
homogeneous film;
Molecular docking
Áreas do conhecimento:
Ciências Exatas e da Terra; Química; Química Inorgânica; Química de Materiais
resumo ...
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R. BRITO, BIANCA;
G. FACHINI, LUCAS;
POSTAL, KAHOANA;
R. BOTTINI, RÚBIA CAMILA;
Eduardo Lemos de Sá;
F. ZAWADZKI, SÔNIA;
G. NUNES, GIOVANA
Palavra-chave:
spectroscopy;
polioxovanadate
Áreas do conhecimento:
Ciências Exatas e da Terra; Química; Físico-Química; Eletroquímica;
Ciências Exatas e da Terra; Química; Química Inorgânica; Físico Química Inorgânica;
Ciências Exatas e da Terra; Química; Físico-Química; Química Teórica
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SILVA, PAULO L. DATTORI DA;
Alexandre Kirilov;
PALEARI, RICARDO
Palavra-chave:
Global Hypoellipticity;
Global Solvability;
compact Lie group;
Diophantine conditions
Áreas do conhecimento:
Ciências Exatas e da Terra; Matemática; Análise; Equações Diferenciais Parciais;
Ciências Exatas e da Terra; Matemática; Análise; Equações Diferenciais Parciais
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We investigate the global hypoellipticity and global solvability of systems of left-invariant differential operators on compact Lie groups. Focusing on diagonal systems, we establish necessary and sufficient conditions for these global properties. Specifically, we show that global solvability is characterized by a Diophantine condition on the symbol of the system, while global hypoellipticity further requires a set depending on the symbol to be finite. As an application, we provide a complete characterization of these properties for systems of vector fields defined on products of tori and spheres. Additionally, we present illustrative examples, including systems involving higher-order differential operators. Finally, we extend our analysis to triangular systems on compact Lie groups, introducing an additional condition related to the boundedness of the dimensions of the representations of these Lie groups.
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Eduardo Luis Cupertino Ballester;
BALDISSEROTTO, BERNARDO;
DE SOUZA VALENTE, CECÍLIA;
COSTA, WILSON GILBERTO DA SILVA;
DO NASCIMENTO FERREIRA, CAIO HENRIQUE;
RETCHESKI, MILENA CIA;
CAZAROLLI, LUISA HELENA;
SCHWENGBER, GABRIEL HENRIQUE;
MAUERWERK, MARLISE TERESINHA;
PINHEIRO, CARLOS GARRIDO;
HEINZMANN, BERTA MARIA
Palavra-chave:
Estresse Oxidativo;
Sistema Imune;
óleos essenciais
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Pesqueiros e Engenharia de Pesca; Aqüicultura; Piscicultura;
Ciências Exatas e da Terra; Geociências; Geologia; Cartografia Geológica
resumo ...
This study analyzed the performance, antioxidant status, hepatopancreatic lipoperoxidation, and proximate composition of Macrobrachium rosenbergii juveniles fed diets supplemented with clove basil (Ocimum gratissimum) essential oil (EO-OG). A total of 360 M. rosenbergii (initial weight 0.028 g ± 0.004) were randomly divided into four experimental groups with six replications each (n = 6). The prawns were fed diets with different EO-OG inclusion levels: 0.0, 1.0, 2.0, and 3.0 g kg−1 EO-OG. After a 42-day feeding trial, dietary EO-OG showed no significant effect on prawn performance or carcass proximate composition, except on final antenna length. Prawns fed 3.0 g kg−1 EO-OG displayed a 1.2- to 1.3-fold longer final antenna length than prawns from all other experimental groups. Likewise, prawns fed 3.0 g kg−1 EO-OG presented a 2.6- to 3.2-fold higher catalase activity than prawns from all other experimental groups. Prawns fed EO-OG, regardless of the inclusion level, showed a 1.6- to 1.7-fold decreased hepatopancreatic lipoperoxidation compared to the control group. Therefore, EO-OG has been demonstrated to be a potential management tool as a non-nutritional dietary immunostimulant and animal welfare promoter for freshwater prawn farming, without affecting animal performance. This study recommends the dietary inclusion level of 3.0 g kg−1 EO-OG for M. rosenbergii juveniles.
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ROCHA, ELIS BRANDÃO;
KERR, RODRIGO;
Machado, Eunice C.;
Maurício Garcia Camargo;
DE REZENDE, CARLOS EDUARDO;
GATTS, PEDRO VIANNA;
MENDES, CARLOS RAFAEL BORGES;
COSTA, RAUL RODRIGO;
WALLNER-KERSANACH, MÔNICA;
MATA, MAURICIO M.
Palavra-chave:
particulate organic carbon;
Total particulate nitrogen;
Stable carbon isotopes;
Seasonal Sea Ice Zone;
Southern Ocean
Áreas do conhecimento:
Ciências Exatas e da Terra; BIOGEOQUÍMICA MARINHA
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