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Ishihara MA, Domingos FMCB, Gomides SC, Novelli IA, Colli GR, Vargas SM. Genetic structure of Enyalius capetinga (Squamata, Leiosauridae) in Central Cerrado and transitional areas between the Cerrado and the Atlantic forest, with updated geographic distribution. Genetica 2022; 150:367-377. [PMID: 36229707 DOI: 10.1007/s10709-022-00170-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 09/28/2022] [Indexed: 11/26/2022]
Abstract
The Brazilian Cerrado is considered a biodiversity hotspot highly threatened by human activities. Recently, many studies have demonstrated how underestimated is Cerrado's biodiversity considering squamate species, and the identification of divergent and cryptic lineages is essential for the formulation of effective conservation strategies. The transition areas between the Cerrado and the Atlantic Forest are even less known and, consequently, often dismissed in conservation policies. As previous studies suggested the presence of cryptic diversity within E. capetinga, we investigated patterns and processes in the geographic distribution of its genealogical lineages. We used DNA sequences from individuals collected in six localities and sequences publicly available from three mitochondrial markers (CYT-B, 16S and ND4) and one nuclear marker (C-Mos). We tested if the core and ecotone regions of the Cerrado show differences in biotic and abiotic characteristics that could promote genetic structure and divergence among lineages within E. capetinga. We found evidence for divergent lineages within the species, but not congruent with our hypothesis. Similar divergent patterns were observed in other Cerrado lizards, including interspecific divergences within the Enyalius genus. Molecular characterization of field-collected individuals (previously identified as E. bilineatus), allowed us to update the geographic distribution of the species to include the ecotone between the Cerrado and the Atlantic Forest, an area where species distribution overlap.
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Affiliation(s)
- M A Ishihara
- Departamento de Ciências Biológicas, Laboratório de Genética E Evolução Molecular, Universidade Federal Do Espírito Santo, Vitória, ES, 29075-910, Brazil.
- Universidade Federal Do Espírito Santo, Vitória, ES, 29075-910, Brazil.
| | - F M C B Domingos
- Departamento de Zoologia, Universidade Federal Do Paraná, Curitiba, PR, 81531-980, Brazil
| | - S C Gomides
- Programa de Pós-Graduação em Biodiversidade, Universidade Federal do Oeste do Pará, Campus Oriximiná, Rodovia PA-254, 257, Oriximiná, PA, 68270-000, Brazil
| | - I A Novelli
- Laboratório de Zoologia, Centro Universitário de Lavras - UNILAVRAS, Lavras, MG, 37203-593, Brazil
| | - G R Colli
- Departamento de Zoologia, Universidade de Brasília, Brasília, DF, 70910-900, Brazil
| | - S M Vargas
- Departamento de Ciências Biológicas, Laboratório de Genética E Evolução Molecular, Universidade Federal Do Espírito Santo, Vitória, ES, 29075-910, Brazil
- Universidade Federal Do Espírito Santo, Vitória, ES, 29075-910, Brazil
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Beman JM, Vargas SM, Wilson JM, Perez-Coronel E, Karolewski JS, Vazquez S, Yu A, Cairo AE, White ME, Koester I, Aluwihare LI, Wankel SD. Substantial oxygen consumption by aerobic nitrite oxidation in oceanic oxygen minimum zones. Nat Commun 2021; 12:7043. [PMID: 34857761 PMCID: PMC8639706 DOI: 10.1038/s41467-021-27381-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 11/15/2021] [Indexed: 01/04/2023] Open
Abstract
Oceanic oxygen minimum zones (OMZs) are globally significant sites of biogeochemical cycling where microorganisms deplete dissolved oxygen (DO) to concentrations <20 µM. Amid intense competition for DO in these metabolically challenging environments, aerobic nitrite oxidation may consume significant amounts of DO and help maintain low DO concentrations, but this remains unquantified. Using parallel measurements of oxygen consumption rates and 15N-nitrite oxidation rates applied to both water column profiles and oxygen manipulation experiments, we show that the contribution of nitrite oxidation to overall DO consumption systematically increases as DO declines below 2 µM. Nitrite oxidation can account for all DO consumption only under DO concentrations <393 nM found in and below the secondary chlorophyll maximum. These patterns are consistent across sampling stations and experiments, reflecting coupling between nitrate reduction and nitrite-oxidizing Nitrospina with high oxygen affinity (based on isotopic and omic data). Collectively our results demonstrate that nitrite oxidation plays a pivotal role in the maintenance and biogeochemical dynamics of OMZs.
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Affiliation(s)
- J. M. Beman
- grid.266096.d0000 0001 0049 1282Life and Environmental Sciences, University of California, Merced, Merced, CA USA
| | - S. M. Vargas
- grid.266096.d0000 0001 0049 1282Life and Environmental Sciences, University of California, Merced, Merced, CA USA
| | - J. M. Wilson
- grid.266096.d0000 0001 0049 1282Life and Environmental Sciences, University of California, Merced, Merced, CA USA ,grid.266100.30000 0001 2107 4242Scripps Institution of Oceanography, University of California, San Diego, CA USA
| | - E. Perez-Coronel
- grid.266096.d0000 0001 0049 1282Life and Environmental Sciences, University of California, Merced, Merced, CA USA
| | - J. S. Karolewski
- grid.56466.370000 0004 0504 7510Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA USA
| | - S. Vazquez
- grid.266096.d0000 0001 0049 1282Life and Environmental Sciences, University of California, Merced, Merced, CA USA
| | - A. Yu
- grid.266096.d0000 0001 0049 1282Life and Environmental Sciences, University of California, Merced, Merced, CA USA
| | - A. E. Cairo
- grid.266096.d0000 0001 0049 1282Life and Environmental Sciences, University of California, Merced, Merced, CA USA
| | - M. E. White
- grid.266100.30000 0001 2107 4242Scripps Institution of Oceanography, University of California, San Diego, CA USA
| | - I. Koester
- grid.266100.30000 0001 2107 4242Scripps Institution of Oceanography, University of California, San Diego, CA USA
| | - L. I. Aluwihare
- grid.266100.30000 0001 2107 4242Scripps Institution of Oceanography, University of California, San Diego, CA USA
| | - S. D. Wankel
- grid.56466.370000 0004 0504 7510Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA USA
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Vargas SM, Rabelo TF, Ballester RY. Hipótese para Explicar a Influência do Fator Mecânico na Formação de Lesões Cervicais não Cariosas: Análise por Elementos Finitos. J Health Scie 2018. [DOI: 10.17921/2447-8938.2017v19n5p83] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
O objetivo da pesquisa foi avaliar a variação de volume dos três constituintes dentinários (Intertubular [I], Peritubular [P] e Lúmen [L]) em função da tensão de tração média por meio de elementos finitos. A variação volumétrica em L seria compatível com a ocorrência de expulsão/introdução forçada de fluído circundante que, se for ácido, pode ocasionar maior desmineralização em regiões submetidas à tração, o que explicaria a origem da lesão cervical não cariosa [LCNC]. Um modelo 2D “plane strain” representativo da célula unitária microestrutural da dentina, constituído por 1292 elementos triangulares quadráticos, composto pelas fases: I, P e L, foi submetido a aplicações de pressão que geraram tensões médias de tração que variaram entre 7,5 – 75 MPa, através do software ABAQUS 6.13. A variação de volume em função da tensão média foi aproximadamente linear em cada fase, e alcançou o valor máximo de L0,81%, P0,23% e I0,34%. Variações de tensão podem alterar significativamente o volume e, consequentemente, provocar o fluxo forçado do líquido circundante, preferencialmente através do lúmen dos túbulos submetidos a tração, iniciando através deles a desmineralização localizada que caracteriza a LCNC.Palavras-chave: Dentina. Análise. Elementos Finitos. Lesão Cervical não Cariosa. Tração.
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Burkle D, De Motte R, Taleb W, Kleppe A, Comyn T, Vargas SM, Neville A, Barker R. Development of an electrochemically integrated SR-GIXRD flow cell to study FeCO 3 formation kinetics. Rev Sci Instrum 2016; 87:105125. [PMID: 27802698 DOI: 10.1063/1.4965971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An electrochemically integrated Synchrotron Radiation-Grazing Incidence X-Ray Diffraction (SR-GIXRD) flow cell for studying corrosion product formation on carbon steel in carbon dioxide (CO2)-containing brines typical of oil and gas production has been developed. The system is capable of generating flow velocities of up to 2 m/s at temperatures in excess of 80 °C during SR-GIXRD measurements of the steel surface, enabling flow to be maintained over the course of the experiment while diffraction patterns are being collected. The design of the flow cell is presented, along with electrochemical and diffraction pattern transients collected from an initial experiment which examined the precipitation of FeCO3 onto X65 carbon steel in a CO2-saturated 3.5 wt. % NaCl brine at 80 °C and 0.1 m/s. The flow cell is used to follow the nucleation and growth kinetics of FeCO3 using SR-GIXRD linked to the simultaneous electrochemical response of the steel surface which were collected in the form of linear polarisation resistance measurements to decipher in situ corrosion rates. The results show that FeCO3 nucleation could be detected consistently and well before its inhibitive effect on the general corrosion rate of the system. In situ measurements are compared with ex situ scanning electron microscopy (SEM) observations showing the development of an FeCO3 layer on the corroding steel surface over time confirming the in situ interpretations. The results presented demonstrate that under the specific conditions evaluated, FeCO3 was the only crystalline phase to form in the system, with no crystalline precursors being apparent. The numerous capabilities of the flow cell are highlighted and presented in this paper.
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Affiliation(s)
- D Burkle
- Institue of Functional Surfaces, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - R De Motte
- Institue of Functional Surfaces, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - W Taleb
- Institue of Functional Surfaces, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - A Kleppe
- Diamond Light Source Ltd., Diamond House, Didcot, Oxfordshire OX11 ODE, United Kingdom
| | - T Comyn
- Ionix Advanced Technologies, 3M Buckley Innovation Centre, Firth Street, Huddersfield HD1 3BD, United Kingdom
| | - S M Vargas
- BP America, Inc., Houston, Texas 77079, USA
| | - A Neville
- Institue of Functional Surfaces, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - R Barker
- Institue of Functional Surfaces, University of Leeds, Leeds LS2 9JT, United Kingdom
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Bouzon JL, Vargas SM, Oliveira Neto JF, Stoco PH, Brandini FP. Cryptic species and genetic structure in Didemnum granulatum Tokioka, 1954 (Tunicata: Ascidiacea) from the southern Brazilian coast. BRAZ J BIOL 2014; 74:923-32. [PMID: 25627604 DOI: 10.1590/1519-6984.00213] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 02/11/2014] [Indexed: 11/22/2022] Open
Abstract
Didemnum granulatum is a colonial fouling ascidian that lives in subtidal substrates, worldwide. It exhibits two morphotypes, orange and beige. In this study, we verified if the color morphotypes and/or the spatial distribution of specimens in different islands might be associated to patterns of genetic structure of a single species, or if they represent distinct cryptic species. Specimens were collected in four islands, along the coast of the Santa Catarina state. A segment of 490 bp from the mitochondrial gene cytochrome c oxidase subunit 1 (COI) was amplified from 45 samples. Twenty-one haplotypes were identified. The total haplotype diversity (0.912) and the total nucleotide diversity (0.044) were high. The global Fst of the populations analyzed was 0.97, with most of the variation occurring between orange and beige groups (82.19%). The variation found between populations within groups was 15.37%, and 2.45% within populations. Haplotype networks and the neighbor-joining tree showed clear genetic divergence between individuals of distinct colors, and between the islands. These evidences strongly support the presence of a complex of two cryptic species for D. granulatum occupying the studied area. Both species were also highly genetically structured between islands, suggesting that the conservation process of these populations is complex.
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Affiliation(s)
- J L Bouzon
- Programa de Pós-Graduação em Zoologia, Universidade Federal do Paraná - UFPR, Curitiba, PR, Brazil
| | - S M Vargas
- Universidade Federal do Espírito Santo - UFES, Vitória, ES, Brazil
| | - J F Oliveira Neto
- Faculdade Estadual de Filosofia, Ciências e Letras de Paranaguá, Universidade Estadual do Paraná - UNESPAR, Paranaguá, PR, Brazil
| | - P H Stoco
- Laboratório de Protozoologia, Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Catarina - UFSC, Campus João David Ferreira Lima, Florianópolis, SC, Brazil
| | - F P Brandini
- Instituto Oceanográfico da Universidade de São Paulo, Universidade de São Paulo - USP, São Paulo, SP, Brazil
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Reis EC, Soares LS, Vargas SM, Santos FR, Young RJ, Bjorndal KA, Bolten AB, Lôbo-Hajdu G. Genetic composition, population structure and phylogeography of the loggerhead sea turtle: colonization hypothesis for the Brazilian rookeries. CONSERV GENET 2009. [DOI: 10.1007/s10592-009-9975-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Vargas SM, Torres GA, Sobrinho FS, Pereira AV, Davide LC. Karyotypic studies of Cratylia argentea (Desv.) O. Kuntze and C. mollis Mart. ex Benth. (Fabaceae - Papilionoideae). Genet Mol Res 2007; 6:707-712. [PMID: 18050091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Cratylia argentea and C. mollis (Fabaceae-Papilionoideae) are legume shrubs native to the Cerrado and Caatinga, respectively. Both species show great resistance to drought and high nutritive value, which makes them a valuable forage resource in tropical regions. Cytogenetic studies were carried out on accessions of C. argentea and C. mollis from Germplasm Banks of Embrapa Gado de Leite (Juiz de Fora, MG) and Embrapa Semi-Arido (Petrolina, PE), respectively. Root tips were treated with 3 mM 8-hydroxyquinoline and slides were made using the air-dry technique. Karyotype description for each accession took into account the following features: chromosome number; total length, relative length and arm ratio of each chromosome; haploid set length, and degree of asymmetry. Mitotic metaphases in both species showed 2n = 22 chromosomes, where this is the first report of diploid number for C. mollis. Chromosome length was also quite similar for the two species, ranging from 5.08 to 2.50 microm in C. argentea and 5.12 to 2.51 microm in C. mollis, with haploid sets of equal size, measuring 38.10 and 37.85 microm, respectively. However, they did not show the same karyotypic formula, which was 5 m + 4 sm + 2 st for C. argentea and 7 m + 2 sm + 2 st for C. mollis. This indicates the occurrence of rearrangements within chromosomes I and VI. Both karyotypes showed a tendency for asymmetry.
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Affiliation(s)
- S M Vargas
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
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Arrufat JM, Vera-Román JM, Casas V, Vargas SM, Andrés C, Albella F. [Inverted papilloma of the ureter]. Actas Urol Esp 1983; 7:225-8. [PMID: 6624567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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