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Machado-Rugolo J, Balancin M, Martins V, Miranda J, Assato A, Souza N, Velosa A, Falzoni R, Ab'saber A, Teodoro W, Capelozzi V. P1.06-01 Combining Immunoprofile, Immunogenic Collagen and Mismatch Repair Proteins Predicts Risk of Death and Target Therapy in Malignant Mesothelioma. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Rodrigues K, Souza N, Cunha J, Nicolatino G, Almeida F, Daher Y, Miguel J, Vilar L. Correlation between anti-HBs antibodies and the elapsed time after the last dose of Hepatitis B vaccine in medical students. Int J Infect Dis 2018. [DOI: 10.1016/j.ijid.2018.04.4217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Reinert L, Lasserre F, Gachot C, Grützmacher P, MacLucas T, Souza N, Mücklich F, Suarez S. Long-lasting solid lubrication by CNT-coated patterned surfaces. Sci Rep 2017; 7:42873. [PMID: 28211468 PMCID: PMC5314357 DOI: 10.1038/srep42873] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 01/16/2017] [Indexed: 11/09/2022] Open
Abstract
The use of lubricants (solid or liquid) is a well-known and suitable approach to reduce friction and wear of moving machine components. Another possibility to influence the tribological behaviour is the formation of well-defined surface topographies such as dimples, bumps or lattice-like pattern geometries by laser surface texturing. However, both methods are limited in their effect: surface textures may be gradually destroyed by plastic deformation and lubricants may be removed from the contact area, therefore no longer properly protecting the contacting surfaces. The present study focuses on the combination of both methods as an integral solution, overcoming individual limitations of each method. Multiwall carbon nanotubes (MWCNT), a known solid lubricant, are deposited onto laser surface textured samples by electrophoretic deposition. The frictional behaviour is recorded by a tribometer and resulting wear tracks are analysed by scanning electron microscopy and Raman spectroscopy in order to reveal the acting tribological mechanisms. The combined approach shows an extended, minimum fivefold longevity of the lubrication and a significantly reduced degradation of the laser textures. Raman spectroscopy proves decelerated MWCNT degradation and oxide formation in the contact. Finally, a lubricant entrapping model based on surface texturing is proposed and demonstrated.
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Affiliation(s)
- L Reinert
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
| | - F Lasserre
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
| | - C Gachot
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
| | - P Grützmacher
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
| | - T MacLucas
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
| | - N Souza
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
| | - F Mücklich
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
| | - S Suarez
- Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
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Souza N, Lasserre F, Blickley A, Zeiger M, Suárez S, Duarte M, Presser V, Mücklich F. Upcycling spent petroleum cracking catalyst: pulsed laser deposition of single-wall carbon nanotubes and silica nanowires. RSC Adv 2016. [DOI: 10.1039/c6ra15479d] [Citation(s) in RCA: 3] [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] [Indexed: 11/21/2022] Open
Abstract
From waste to single-wall carbon nanotubes and silica nanowires: the first high-tech outlet for FC3R.
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Affiliation(s)
- N. Souza
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
| | - F. Lasserre
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
| | - A. Blickley
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
- Department of Materials Science and Engineering
| | - M. Zeiger
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
- INM – Leibniz Institute for New Materials
| | - S. Suárez
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
| | - M. Duarte
- Engineering and Technology School
- Catholic University of Uruguay
- 11600 Montevideo
- Uruguay
| | - V. Presser
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
- INM – Leibniz Institute for New Materials
| | - F. Mücklich
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
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Souza N, Zeiger M, Presser V, Mücklich F. In situ tracking of defect healing and purification of single-wall carbon nanotubes with laser radiation by time-resolved Raman spectroscopy. RSC Adv 2015. [DOI: 10.1039/c5ra09316c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fine-tuned localised laser heating of pristine or mechanically dispersed (for composite processing) SWCNTs resulting in precision healing and purification.
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Affiliation(s)
- N. Souza
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
| | - M. Zeiger
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
- INM – Leibniz Institute for New Materials & Department of Materials Science
| | - V. Presser
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
- INM – Leibniz Institute for New Materials & Department of Materials Science
| | - F. Mücklich
- Department of Materials Science
- Saarland University
- 66123 Saarbrücken
- Germany
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Bichuetti D, Boulos F, Shinosaki J, Souza N, Oliveira E, Gabbai A. Treatment of Neuromyelitis Optica with Intravenous Immunoglobulin: Report of 8 Patients (P04.141). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p04.141] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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de Moura Ramos EH, Martinelli S, Silva I, Nazário A, Facina G, Costa A, Carvalho C, Souza N. Association between estrogen receptor gene polymorphisms and breast density in postmenopausal women. Climacteric 2009; 12:490-501. [DOI: 10.3109/13697130902952585] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Prado R, Prado I, Marques J, Rotta P, Visentainer J, Silva R, Souza N. Meat quality of the Longissimus muscle of bulls and
steers (½ Nellore vs ½ Simmental) finished in feedlot. J Anim Feed Sci 2009. [DOI: 10.22358/jafs/66386/2009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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de Moura Ramos E, Martinelli S, Silva I, Nazario A, Facina G, Costa A, Carvalho C, Souza N. Association between estrogen receptor gene polymorphisms and breast density in postmenopausal women. Climacteric 2009. [DOI: 10.1080/13697130902952585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Maingon RDC, Ward RD, Hamilton JGC, Noyes HA, Souza N, Kemp SJ, Watts PC. Genetic identification of two sibling species of Lutzomyia longipalpis (Diptera: Psychodidae) that produce distinct male sex pheromones in Sobral, Ceará State, Brazil. Mol Ecol 2003; 12:1879-94. [PMID: 12803639 DOI: 10.1046/j.1365-294x.2003.01871.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Lutzomyia longipalpis, the main sandfly vector for New World visceral leishmaniasis is a complex of an as yet undefined number of sibling species. At present, there is no consensus on the status (single species vs. species complex) of Brazilian populations. We applied five microsatellite loci to test the hypothesis that L. longipalpis occurs as two sympatric cryptic species in Sobral, Ceará State, Brazil as predicted by male sex pheromone chemotypes described previously for field specimens from this site [S-9-methyl-germacrene-B (9MGB) and a cembrene compound]. Abdominal spot morphology corresponds with pheromone type at this locality (9MGB in '1 spot' males and cembrene in '2 spot' males). Genotype data from 190 wild-caught L. longipalpis specimens collected in October 1999 and April 2001 were used to estimate genetic differentiation between the two sex pheromone populations and sampling dates. No significant (P > 0.05) genetic differences were found between the 1999 and 2001 9MGB samples (theta = 0.018; RST = -0.005), and genetic differentiation was low between the cembrene collections (theta = 0.037, P < 0.05; RST = -0.043, P > 0.05). By contrast, highly divergent allelic frequencies (largely at two microsatellite loci) corresponded to significant (P > 0.05) genetic differentiation (theta = 0.221; RST = 0.215) for all comparisons between samples with different pheromones. When pheromone samples were pooled across sample date, genetic differentiation was high (theta = 0.229; P < 0.001; Nem = 0.84). The allele frequency distribution at each of the five microsatellite loci was similar for males and females from the two collection years. Two of these loci showed highly divergent allele frequencies in the two sex pheromone populations. This was reflected in the highly significant genetic differentiation obtained from the male genotypes, between populations producing different pheromones (theta = 0.229-0.268; P < 0.0001 for the 2001 and theta = 0.254-0.558; P < 0.0001 for the 1999 collections, respectively). Similar results were obtained when the females, assigned to a pheromone type, were included in the analysis. Both a Bayesian analysis of the data set and a population assignment test provided strong evidence for two distinct populations corresponding to pheromone type. Given its genotype, the probability of assigning a 9MGB male to the original 9MGB population was 100% once the two years' collections were pooled. For cembrene-producing '2 spot' males this probability although still high, was lower than for 9MGB males, at 86%. This microsatellite data together with previously reported reproductive isolation between the two Sobral populations confirm that premating barriers are important in speciation of L. longipalpis.
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Affiliation(s)
- R D C Maingon
- Centre for Applied Entomology and Parasitology, School of Life Sciences, Keele University, ST5 5BG, UK.
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Abstract
Lutzomyia longipalpis (Lutz & Neiva, 1912) (Diptera: Psychodidae: Phlebotominae) is a vector of visceral leishmaniasis in the Americas and it might represent a complex of sibling species. Reproductive isolation between closely related species often involves differences in courtship behaviour. cacophony (cac) and period (per) are two Drosophila genes that control features of the "lovesong" males produce during courtship that has been implicated in the sexual isolation between closely related species. We are using gene fragments from L. longipalpis' homologues of these two genes to study the speciation process in this putative species complex.
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Affiliation(s)
- S Oliveira
- Departamento de Biologia Animal e Vegetal, Universidade Estadual do Rio de Janeiro, Rio de Janeiro, Brasil
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Marcondes CB, Lozovei AL, Falqueto A, Brazil RP, Galati E, Aguiar G, Souza N. Influence of altitude, latitude and season of collection (Bergmann's rule) on the dimensions of Lutzomyia intermedia (Lutz & Neiva, 1912) (Diptera, Psychodidae, Phlebotominae). Mem Inst Oswaldo Cruz 1999; 94:693-700. [PMID: 10464420 DOI: 10.1590/s0074-02761999000500026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The influence of altitude and latitude on some structure sizes of Lutzomyia intermedia was noted; several structures of insects collected in higher localities were greater, according to Bergmann's rule. This influence was more remarkable in two localities of the State of Espírito Santo, probably due to greater differences in altitude. Comparing insects from different latitudes, more differences were noted in comparisons of insects from low altitude localities than in those of material from higher altitudes. The small number of differences between insects collected in July and in December does not indicate a defined influence of season and temperature on the size of adults. The possible epidemiological implications of these variations are discussed.
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Affiliation(s)
- C B Marcondes
- Departamento de Microbiologia e Parasitologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brasil.
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