1,720,963 research outputs found
Gfaas Determination Of Mercury In Muscle Samples Of Fish From Amazon, Brazil
No full textIn the present study, a simple, rapid and sensitive method was developed for the determination of mercury concentrations in the muscle tissue of fish from the Brazilian Amazon using graphite furnace atomic absorption spectrometry (GFAAS) following acid mineralization of the samples in an ultrasonic cold water bath. Using copper nitrate as a chemical modifier in solution and sodium tungstate as permanent modifier, we were able to attain thermal stabilization of the mercury up to the atomisation temperature of 1600 °C in the GFAAS assay. The calculated limits of detection (LOD) and quantification (LOQ) were 0.014 and 0.047 mg kg-1, respectively. © 2013 Elsevier Ltd. All rights reserved.141326142617Bermejo-Barrera, P., Moreda-Pineiro, J., Moreda-Pineiro, A., Bermejo-Barrera, A., Palladium as a chemical modifier for the determination of mercury in marine sediment slurries by electrothermal atomization atomic absorption spectrometry (1994) Analytica Chimica Acta, 296 (2), pp. 181-193. , DOI 10.1016/0003-2670(94)80262-9Bermejo-Barrera, P., Verdura-Constenla, E.M., Moreda-Pineiro, A., Bermejo-Barrera, A., Rapid acid leaching and slurry sampling procedures for the determination of methyl-mercury and total mercury in human hair by electrothermal atomic absorption spectrometry (1999) Analytica Chimica Acta, 398 (2-3), pp. 263-272. , DOI 10.1016/S0003-2670(99)00453-5, PII S0003267099004535Bidone, E.D., Castilhos, Z.C., Santos, T.J.S., Souza, T.M.C., Lacerda, Fish contamination and human exposure to mercury in tartarugalzinho river, amapa state, northern amazon, brazil. A screening approach (1997) Water, Air, and Soil Pollution, 97 (1-2), pp. 9-15. , DOI 10.1023/A:1018383502637Currie, L.A., Nomenclature in evaluation of analytical methods including detection and quantification capabilities (IUPAC Recommendations 1995) (1999) Analytica Chimica Acta, 391 (2), pp. 105-126. , DOI 10.1016/S0003-2670(99)00104-X, PII S000326709900104XGallignani, M., Bahsas, H., Brunetto, M.R., Burguera, M., Burguera, J.L., Petit De Pena, Y., A time-based flow injection-cold vapor-atomic absorption spectrometry system with on-line microwave sample pre-treatment for the determination of inorganic and total mercury in urine (1998) Analytica Chimica Acta, 369 (1-2), pp. 57-67. , DOI 10.1016/S0003-2670(98)00217-7, PII S0003267098002177Horwitz, W., Albert, R., The concept of uncertainty as applied to chemical measurements (1997) Analyst, 122 (6), pp. 615-617. , DOI 10.1039/a703178eMcClure, F.D., Lee, J.-K., Computation of HORRAT Values (2003) Journal of AOAC International, 86, pp. 1056-1058Mondal, B.C., Das, A.K., Determination of mercury species with a resin functionalized with a 1,2-bis(o-aminophenylthio)ethane moiety (2003) Analytica Chimica Acta, 477 (1), pp. 73-80. , DOI 10.1016/S0003-2670(02)01372-7, PII S0003267002013727Moreda-Pineiro, L., Lopez-Mahia, P., Muniategui-Lorenzo, S., Fernandez-Fernandez, E., Prada-Rodriguez, D., Direct mercury determination in aqueous slurries of environmental and biological samples by cold vapour generation-electrothermal atomic absorption spectrometry (2002) Analytica Chimica Acta, 460, pp. 111-122Neves, R.C.F., Moraes, P.M., Saleh, M.A.D., Loureiro, V.R., Silva, F.A., Barros, M.M., FAAS determination of metal nutrients in fish feed after ultrasound extraction (2009) Food Chemistry, 113, pp. 679-683Pfeiffer, W.C., Lacerda, L.D., Salomons, W., Malm, O., Environment fate of mercury from gold mining in the Brazilian Amazon (1993) Environmental Reviews, 1, pp. 26-37Silva, F.A., Neves, R.C.F., Quintero-Pinto, L.G., Padilha, C.C.F., Jorge, S.M.A., Barros, M.M., Pezzato, L.E., Padilha, P.M., Determination of selenium by GFAAS in slurries of fish feces to estimate the bioavailability of this micronutrient in feed used in pisciculture (2007) Chemosphere, 68 (8), pp. 1542-1547. , DOI 10.1016/j.chemosphere.2007.03.003, PII S0045653507003414Silva, F.A., Padilha, C.C.F., Pezzato, L.E., Barros, M.M., Padilha, P.M., Determination of chromium by GFAAS in slurries of fish feces to estimate the apparent digestibility of nutrients in feed used in pisciculture (2006) Talanta, 69 (4), pp. 1025-1030. , DOI 10.1016/j.talanta.2005.12.008, PII S0039914005007915Torres, D.P., Vieira, M.A., Ribeiro, A.S., Curtius, A.J., Determination of inorganic and total mercury in biological samples treated with tetramethylammonium hydroxide by cold vapor atomic absorption spectrometry using different temperatures in the quartz cell (2005) Journal of Analytical Atomic Spectrometry, 20 (4), pp. 289-294. , DOI 10.1039/b416167jZhang, Y., Adeloju, S.B., Speciation of mercury in fish samples by flow injection catalytic cold vapour atomic absorption spectrometry (2012) Analytica Chimica Acta, 721, pp. 22-2
Copper Fractionation In Proteins From Plasma, Muscle And Liver Of Nile Tilapia [fracionamento De Cobre Em Proteínas Do Plasma, Músculo E Fígado De Tilápia Do Nilo]
No full textCopper fractionation in plasma, muscle and liver of Nile tilapia was performed after protein separation by 2D-PAGE. SR XRF analysis indicated the presence of copper in three protein spots of plasma, and in two protein spots of muscle and liver, respectively. Copper ions were found to be distributed mostly in proteins that had a molar mass of less than 54 kDa and greater than 13 kDa and a pI in the 5.3-9.3 range. The copper concentration bound to these proteins was determined by GFAAS which showed concentrations in the 1.20-4.82 mg g -1 range.353493498Knox, D., Cowey, C.B., Adron, J.W., (1982) Aquaculture, 27, p. 111Gatlin, D.M., Wilson, P.W., (1986) Aquaculture, 52, p. 191Neves, R.C.F., Moraes, P.M., Silva, F.A., Loureiro, V.R., Saleh, M.A.D., Padilha, C.C.F., Barros, M.M., Padilha, P.M., (2008) Sens. Instrumen. Food Qual., 2, p. 274Neves, R.C.F., Moraes, P.M., Saleh, M.A.D., Loureiro, V.R., Silva, F.A., Barros, M.M., Padilha, C.C.F., Padilha, P.M., (2009) Food Chem., 113, p. 679Sá, M.V.C., Pezzato, L.E., Barros, M.M., Padilha, P.M., (2004) Aquaculture, 238, p. 385Sá, M.V.C., Pezzato, L.E., Barros, M.M., Padilha, P.M., (2005) Aquac. Nutr., 11, p. 273Silva, F.A., Neves, R.C.F., Quintero-Pinto, L.G., Padilha, C.C.F., Jorge, S.M.A., Barros, M.M., Pezzato, L.E., Padilha, P.M., (2007) Chemosphere, 68, p. 1542Loureiro, V.R., Saleh, M.A.D., Moraes, P.M., Neves, R.C.F., Padilha, C.C.F., Padilha, P.M., (2007) J. Braz. Chem. Soc., 18, p. 1235Silva, F.A., Padilha, C.C.F., Pezzato, L.E., Barros, M.M., Padilha, P.M., (2006) Talanta, 69, p. 1025Haraguchi, H., (2004) J. Anal. At. Spectrom., 19, p. 5Szpunar, P., (2004) Anal. Bioanal. Chem., 378, p. 54Gòmez-Ariza, J.L., Garcia-Barrera, T., Lorenzo, F., Bernal, V., Villegas, M.J., Oliveira, V., (2004) Anal. Chim. Acta, 524, p. 15Garcia, J.S., Magalhães, C.S., Arruda, M.A.Z., (2006) Talanta, 69, p. 1Lima, P.M., Neves, R.C.F., Santos, F.A., Pérez, C.A., Silva, M.A.O., Arruda, M.A.Z., Castro, G.R., Padilha, P.M., (2010) Talanta, 82, p. 1056Santos, F.A., Lima, P.M., Neves, R.C.F., Moraes, P.M., Pérez, C.A., Silva, M.A.O., Arruda, M.A.Z., Padilha, P.M., (2011) Microchim. Acta, 173, p. 49Hames, B.D., Rickwood, D., (1990) Gel Electrophoresis of Proteins: A Practical Approach, p. 383. , 2nd ed., IRL Press: New YorkBerkelman, T., Stenstedt, T., (1998) 2-D Electrophoresis: Principles and Methods, p. 101. , Amersham Biosciences: UppsalaLanças, F.M., Silva, J.C.R., Bicudo, R.C., Neto, M.B., (2003) Analytica, 6, p. 60Bradford, M.M., (1976) Anal. Biochem., 72, p. 248Candiano, G., Bruschi, M., Musante, L., Santucci, L., Ghiggeri, G.M., Carnemolla, B., Orecchia, P., Righetti, P.G., (2004) Electrophoresis, 25, p. 1327Weseloh, G., Kuhbacher, M., Bertelsmann, H., Ozaslan, M., Kyriakopoulos, A., Knochel, A., Behne, D., (2004) J. Radioanal. Nuclear Chem., 259, p. 473Saleh, M.A.D., Neves, R.C.F., Silva, F.A., Moraes, P.M., Loureiro, V.R., Roldan, P.S., Padilha, P.M., (2009) Food Anal. Meth., 2, p. 162Garcia, J.S., Sousa, G.H.M.F., Eberlin, M.N., Arruda, M.A.Z., (2009) Metallomics, 1, p. 107Verbi, F.M., Arruda, S.C.C., Rodríguez, A.P.M., Pérez, C.A., Arruda, M.A.Z., (2005) J. Biochem. Biophys. Meth., 62, p. 97Sussulini, A., Garcia, J.S., Mesko, M.F., Moraes, D.P., Flores, E.M., Pérez, C.A., Arruda, M.A.Z., (2007) Microchim. Acta, 158, p. 173Wind, M., Lehamann, W.D., (2004) J. Anal. At. Spectrom., 19, p. 20Padilha, C.C.F., Moraes, P.M., Garcia, L.A., Pozzi, C.M.C., Lima, G.P.P., Valente, J.P.S., Jorge, S.M.A., Padilha, P.M., (2011) Food Anal. Meth., 4, p. 32
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Selenium Fractionation From Plasma, Muscle And Liver Of Nile Tilapia (oreochromis Niloticus)
No full textThis paper presents the results obtained from selenium fractionation in plasma, muscle and liver samples of Nile tilapia's (Oreochromis niloticus) after protein separation. The plasma, muscle and liver proteome was obtained by 2D-PAGE, and selenium in protein spots was qualitatively and quantitatively determined by synchrotron radiation X-ray fluorescence and graphite furnace atomic absorption spectrometry (GFAAS). The fluorescence spectra indicated the presence of selenium in three protein spots of plasma, two of muscle and one of liver. Selenium was found to be distributed mainly in proteins with a molar mass smaller than 57.0 kDa and with pI in the range of 5.9-9.6, with one exception in the plasma sample, which presented protein with a molar mass of 60.0 kDa. After acid mineralization of the protein spots, a GFAAS determination of the concentration of selenium bound to these proteins indicated a range of 1.35-6.82 mg per g of protein. © 2013 Springer Science+Business Media New York.74158165Voet, D., Voet, J.G., Pratt, C.W., (2002) Fundamentals of Biochemistry, Upgrade Edition (Wiley, New YorkFenton, D.E., (1995) Biocoordination Chemistry, , New York: Oxford Chemistry PrimersGarcia, J.S., Magalhães, C.S., Arruda, M.A.Z., (2006) Talanta, 69, p. 15Gao, Y., Chen, C., Zhang, P., Chai, Z., He, W., Huang, Y., (2003) Anal. Chim. Acta, 485, p. 137Arnesano, F., Banci, L., Bertini, I., Capozzi, F., Ciofi-Baffoni, S., Ciurli, S., Luchinat, C., Viezzoli, M.S., (2006) Coord. Chem. Rev., 250, p. 1450Behne, D., Kyriakopoulos, A., Mammalian selenium-containing proteins (2001) Annu. Rev. Nutr., 21, p. 453Kyriakopoulos, A., Bertelsmann, H., Graebert, A., Hoppe, B., Kuhbacher, M., Behne, D., (2002) J. Trace Elem. Med. Biol., 16, p. 62Watanabe, T., Kiron, V., Satoh, S., (1997) Aquaculture, 151, p. 207Lovell, R.T., (1998) Nutrition and Feeding of Fish, , 2nd edn., Cambridge: KluwerAmweg, E.L., Stuart, D.L., Weston, D.P., (2003) Aquat. Toxicol., 63, p. 25Haraguchi, H., (2004) J. Anal. At. Spectrom., 19, p. 5Szpunar, P., (2004) Anal. Bioanal. Chem., 378, p. 54Mounicou, S., Szpunar, J., Lobinski, R., (2009) Chem. Soc. Rev., 38, p. 1138Silva, F.A., Padilha, C.C.C., de Castro, G.R., Roldan, P.S., Nogueira, A.R.A., Moraes, P.M., Padilha, P.M., (2011) Cent. Eur. J. Chem., 9 (1), p. 119Lima, P.M., Neves, R.C.F., Santos, F.A., Pérez, C.A., Silva, M.O.A., Arruda, M.A.Z., Castro, G.R., Padilha, P.M., (2010) Talanta, 82, p. 1052Santos, F.A., Lima, P.M., Neves, R.C.F., Moraes, P.M., Pérez, C.A., Silva, M.A.O., Arruda, M.A.Z., Padilha, P.M., (2011) Microchim. Acta, 173, p. 43Sá, M.V.C., Pezzato, L.E., Barros, M.M., Padilha, P.M., (2005) Aquac. Nutr., 11 (4), p. 273Hames, B.D., Rickwood, D., (1990) Gel Electrophoresis of Proteins: A Practical Approach, , 2nd edn., New York: IRL PressBradford, M.M., (1976) Anal. Biochem., 72, p. 254Doumas, B.T., Bayse, D.B., Borner, K., Carter, R.J., (1981) Clin. Chem., 2, p. 1654Berkelman, T., Stenstedt, T., (1998) 2-D Electrophoresis: Principles and Methods, , 1st edn., Uppsala: Amersham BiosciencesCandiano, G., Bruschi, M., Musante, L., Santucci, L., Ghiggeri, G.M., Carnemolla, B., Orecchia, P., Righetti, P.G., (2004) Electrophoresis, 25, p. 1333Garcia, J.S., Sousa, G.H.F., Eberlin, M.N., Arruda, M.A.Z., (2009) Metallomics, 1, p. 113Verbi, F.M., Arruda, S.C.C., Rodríguez, A.P.M., Pérez, C.A., Arruda, M.A.Z., (2005) J. Biochem. Biophys. Methods, 62, p. 109Silva, F.A., Neves, R.C.F., Quintero-Pinto, L.G., Padilha, C.C.F., Jorge, S.M.A., Barros, M.M., Pezzato, L.E., Padilha, P.M., (2007) Chemosphere, 68, p. 1547Weseloh, G., Kuhbacher, M., Bertelsmann, H., Ozaslan, M., Kyriakopoulos, A., Knochel, A., Behne, D., (2004) J. Radioanal. Nucl. Chem., 259, p. 478Sussulini, A., Garcia, J.S., Mesko, M.F., Moraes, D.P., Flores, E.M., Perez, C.A., Arruda, M.A.Z., (2007) Microchim. Acta, 158, p. 180Pearson, R.G., (1963) J. Am. Chem. Soc., 85, p. 353
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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