scholarly journals Scanning Electron Microscopy (SEM) in the surficial cover analysis of the low fluvial-marine terraces in the southern coast of São Paulo state, Brazil

2022 ◽  
Vol 23 (1) ◽  
Author(s):  
André De Oliveira Souza ◽  
Archimedes Perez Filho
2013 ◽  
Vol 13 (1) ◽  
pp. 353-355
Author(s):  
Edison Barbieri ◽  
Douglas Bete

Many Neartic seabirds migrate to South America for the non-breeding season, using several key stopover and wintering sites along the Atlantic coast. The Stercorarius pomarinus is a widely distributed seabird found in every Ocean. It is a migratory bird from northern North America that flies southwards. However, there is little information about the occurrence of Stercorarius pomarinus along the São Paulo State coast. Former publications concerning the birds of Iguape- Cananéia- Ilha Comprida estuary have made no mention of the presence of this bird in the region. Thus it is important that forthcoming appearances be recorded. Throughout the bird-sample selection stage, undertaken since 1998 in the Cananéia estuary (25° 02' 44.71" S and 47° 55' 14.58" W) - 272 km from the city of São Paulo -, the bird was seen for the first time, resting in the Cananéia estuary, in January (2012). This note reports the occurrence of Stercorarius pomarinus in the Cananéia estuary, on the southern coast of São Paulo State, Brazil.


2017 ◽  
Vol 13 (6) ◽  
pp. 693-703 ◽  
Author(s):  
João G. Barioto ◽  
Gilson Stanski ◽  
Raphael C. Grabowski ◽  
Rogerio C. Costa ◽  
Antonio L. Castilho

Palaios ◽  
2009 ◽  
Vol 24 (7) ◽  
pp. 416-424 ◽  
Author(s):  
F. Ricardi-Branco ◽  
F. C. Branco ◽  
R. J. F. Garcia ◽  
R. S. Faria ◽  
S. Y. Pereira ◽  
...  

2003 ◽  
Vol 53 ◽  
Author(s):  
Leonardo José Cordeiro Santos ◽  
Janine Berrier ◽  
Michel Grimaldi ◽  
Selma Simões De Castro

Diversos autores têm ressaltado, nos seus trabalhos de pesquisa, uma certa dificuldade na identificação de revestimentos argilosos em observações de campo e de laboratório. O presente trabalho tem por objetivo avaliar a importância da utilização do Microscópio Eletrônico de Varredura (MEV) na identificação e na caracterização destas feições pedológicas encontradas em Argissolos nas proximidades de Bauru-SP. A área de estudo situa-se no oeste do estado de São Paulo, onde o quadro geológico regional é dominado por rochas sedimentares da Formação Marília, Grupo Bauru (Cretáceo da Bacia do Paraná), associadas aos Latossolos e aos Argissolos. Os estudos foram desenvolvidos no laboratório de Ciência do Solo do INRA/ Rennes (França). Um MEV possibilitou a observação e a caracterização química pontual das amostras. Foram utilizadas lâminas delgadas de solo de pequenas dimensões (4,5 X 7 cm) e pequenos torrões de solo (1 cm 3 ) com estrutura preservada. O MEV mostrou-se uma ferramenta eficaz nos estudos de gênese dos solos. Os resultados revelaram ainda que os revestimentos argilosos encontrados no topo no horizonte Bt dos Argissolos apresentam limite nítido com o fundo matricial, forte birrefringência, microlaminação, além da orientação das argilas paralela à parede dos poros, essas características indicam um processo de iluviação mecânica das argilas. As microanálises efetuadas nos revestimentos argilosos forneceram infor-mações adicionais àquelas obtidas com o estudo micromorfológico, principalmente por mostrar a existência de forte variação dos elementos ao longo das microestratificações. THE USE SCANNING ELECTRON MICROSCOPY (SEM) TO RECOGNITION OF CLAY COATINGS Abstract Many authors have been pointing out the difficulties of identification of clay coatings in field and laboratory observations. This work aims at estimating the importance of the Scanning Electron Microscopy (SEM) at the characterization and identification of these pedologicals features found in Alfisols in Bauru (SP) region. The studied region is located in the western part of São Paulo State, where the regional geology is dominated by sedimentary rocks from Marília Formation of Bauru Group (Cretaceous period), associated with soils of Alfisol and Oxisol type (figure 1). The studies were developed at the INRA/Rennes Soil Science laboratory. A Phillips XL20 scanning electron microscopy connected to an EDS spectrometer make the observation and punctual chemistry characterization of the samples possible. Soil thin blades of small dimensions (4,5 X 7,0 cm) and small soil lumps (1,0 cm³) with preserved structure were used. The SEM showed to be an effective tool in soils genesis studies. The results showed that the clay coatings found in the chambers porosity from the superior portion of argillic horizon in Alfisols present a clear boundary with the immediately underlying soil materials, strong birrefringence, micro lamination, besides the orientation of the clays parallel to the pores wall, indicating a mechanic illuviation process of the clay (figures 2 to 6). The microanalyses done in clay coatings found in the argillic horizon, gave additional information to those acquired from the micromorphological studies, especially for showing the existence of a strong variation of the oxides elements through the micro laminations (figure 9 and table 1).


Nauplius ◽  
2021 ◽  
Vol 29 ◽  
Author(s):  
Glauco B. O. Machado ◽  
Joao B. Gusmao ◽  
Murilo Z. Marochi ◽  
Denis M. S. Abessa ◽  
Tânia Marcia Costa

Nauplius ◽  
2016 ◽  
Vol 24 (0) ◽  
Author(s):  
Lizandra Fernandes Miazaki ◽  
Ana Paula Freitas dos Santos ◽  
Dalilla da Silva Salvati ◽  
Fernanda Antunes Alves-Costa ◽  
Rogério Caetano da Costa

2020 ◽  
Vol 42 ◽  
pp. e88 ◽  
Author(s):  
Marcia Regina Stradioto ◽  
Hung Kiang Chang

In the state of São Paulo, the Bauru Group units cover about 47% of the territory, constituting an aquifer of great interest, in particular for public watersupply. In this study, core samples were taken for petrographic and diagenetic characterization of different units, seeking to improve the knowledge of the Bauru Aquifer System. The samples were submitted to analysis by optical microscopy and scanning electron microscopy. The units of this aquifer system are mostly subarkoses (67% of the samples), except the Marilia Formation, which is composed of sublitharenite and quartzarenite. These sandstones were submitted to shallow and low-intensity diagenesis. The main diagenetic phases identified were dissolution of the detrital minerals, notably feldspar and pyroxene, neoformation of clay minerals, iron oxi-hydroxide, calcite and analcime. Locally there is precipitation of quartz, feldspar and titanium oxide.


2009 ◽  
Vol 76 (4) ◽  
pp. 1290-1293 ◽  
Author(s):  
Paulo de Souza Costa Sobrinho ◽  
Maria T. Destro ◽  
Bernadette D. G. M. Franco ◽  
Mariza Landgraf

ABSTRACT The presence of Vibrio parahaemolyticus in 123 oyster samples collected from an estuary on the southern coast of Sao Paulo state, Brazil, was investigated. Of the 123 samples, 99.2% were positive with densities ranging from <3 to 105 most probable number (MPN)/g. Densities correlated significantly with water temperature (r = 0.48; P < 0.001) but not with salinity (r = −0.09; P = 0.34). The effect of harvest site on counts was not significant (P > 0.05). These data provide information for the assessment of exposure of V. parahaemolyticus in oysters at harvest.


Plant Disease ◽  
1998 ◽  
Vol 82 (12) ◽  
pp. 1403-1403 ◽  
Author(s):  
Tatsuya Nagata ◽  
Renato de O. Resende ◽  
Elliot W. Kitajima ◽  
Helcio Costa ◽  
Alice K. Inoue-Nagata ◽  
...  

During a field survey in 1994, five cucumber (Cucumis sativus) cv. Hokushin plants showing symptom of yellowing, mottling, and vein banding on the leaves were collected from a commercial field of the Federal District. By electron microscopy, quasi-spherical particles with double membrane, typical tospovirus-like particles were found in the infected leaf material. All samples strongly reacted with antibody of zucchini lethal chlorosis tospovirus (ZLCV), but not with antibodies of other to-spoviruses reported in Brazil (1): tomato spotted wilt virus (TSWV), tomato chlorotic spot virus (TCSV), groundnut ringspot virus (GRSV), chrysanthemum stem necrosis virus (CSNV), or iris yellow spot virusonion isolate (IYSV-BR). The virus was identified as ZLCV, which was first isolated in 1994 from zucchini (Cucurbita pepo) in São Paulo State, Brazil. Tomato (Lycopersicon esculentum) plants showing stem necrosis and necrotic spots and rings on the leaves were collected in Viçosa, Minas Gerais State. By electron microscopy, molecular studies, and enzyme-linked immunosorbent assay with antibodies of the six tospoviruses occurring in Brazil, the virus was identified as CSNV. This virus was first reported in 1995 on a Chrysanthemum sp. in São Paulo State and recently reported in the Netherlands from Dendranthema indicum. This is the first report of the natural occurrence of ZLCV and CSNV on cucumber and tomato, respectively. Reference: (1) A. C. de Ávila et al. 1998. Pages 32–34 in: Int. Symp. on Tospoviruses and Thrips in Floral and Vegetable Crops, 4th.


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