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| Registros recuperados: 21 | |
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| Ribeiro,D.C.S.Z.; Tavares,W.L.F.; Leite,M.O.; Cerqueira,M.O.P.; Lima,J.S.; Ferreira,L.F.; Feijó,F.A.C.; Haddad,J.P.; Fonseca,L.M.. |
| RESUMO O objetivo deste trabalho foi analisar as leituras de composição do leite cru por meio de espectrofotometria FTIR, utilizando-se curva de regressão PLS, bem como as contagens de células somáticas e bacteriana total por citometria de fluxo, após adição de amido e sacarose. O leite cru foi adulterado com três concentrações de amido e sacarose (0,1%, 0,5% e 1%), colocado em frascos contendo bronopol ou azidiol, os quais foram armazenados em duas temperaturas (7±2°C e 25±2°C ). As análises foram realizadas após zero, três, 24, 48, 72 e 168 horas de armazenamento. O modelo de regressão linear múltipla foi utilizado para análise estatística. A adição de amido e sacarose resultou em mudança significativa (P<0,05) para todas as variáveis dependentes. O... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Raw milk; FTIR; Startch; Sucrose; Composition analysis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000501649 |
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| Pacheco-Sanchez,Cristiana de Paula; Massaguer,Pilar Rodriguez de. |
| Brazilian Ultra High Temperature (UHT) milk consumption has increased during the last decade from 187 to 4,200 million liters. In the continuous UHT process, milk is submitted for 2-4 s to 130-150ºC, in a continuous flow system with immediate refrigeration and aseptical packing in hermetic packages. This research had the purpose to verify the incidence of B. cereus species from the B. cereus group, in UHT milk. In 1998 high indexes of these organisms were reported, reaching 34.14% of the analyzed samples. Beyond this fact, there was the need to establish methods and processes adjusted for correct identification of B. cereus. Thus, commercial sterility tests of 6,500 UHT milk packages were investigated in two assays, after ten days incubation at 37ºC and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: FTIR; PCR; Commercial sterility; Statistical analyses. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200008 |
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| Takizawa,Fabiano Franco; Silva,Graziela de Oliveira da; Konkel,Francisco Eneias; Demiate,Ivo Mottin. |
| In the present work some tropical starches were modified by an oxidative chemical treatment with potassium permanganate and lactic acid. The native and modified samples were evaluated by mid-infrared spectroscopy, differential dyeing, pH, expansion power, solubility and swelling power, clarity of the pastes, susceptibility to syneresis, carboxyl content and reducing power. All modified samples presented dark blue color, higher expansion power (except corn starch), carboxyl content and reducing power. The solubility of the modified starch granules was very high at 90ºC. At this temperature, it was not possible to measure their swelling power. The viscographic analysis showed decrease in peak viscosity and higher degree of cooking instability. The principal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tropical starches; Oxidized starches; FTIR. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000600012 |
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| Mohansrinivasan,V.; Devi C.,Subathra; Deori,Meenakshi; Biswas,Ananya; Naine S,Jemimah. |
| In this study, grape seeds were extracted using ethyl acetate and petroleum ether by solvent-solvent extraction method. The phytochemical tests were performed to identify different phytochemical compounds present in the grape seed extract (GSE). Antibacterial activity of the GSE was determined using agar diffusion method against Gram- positive and Gram-negative bacteria. Gas chromatography-mass spectrometry (GC-MS) and Fourier transform infrared spectroscopy (FTIR) analysis was done to identify the presence of bioactive compounds and their functional groups. The GC-MS results revealed a total of four compounds, known to have potent activity against cancer cells, viz, squalene, the most potent compound found in ethyl acetate extract and diethyl phthalate,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: GSE (Grape seed extract); Phytochemical; FTIR; GCMS; Skin cancer cell line; Anticancer agents. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000400540 |
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| Oliveira,M.C.P.P.; Silva,N.M.A.; Bastos,L.P.F.; Fonseca,L.M.; Cerqueira,M.M.O.P.; Leite,M.O.; Conrrado,R.S.. |
| The objective of this study was to evaluate the CombiScope FTIR equipment based on Fourier Transform Infrared methodology (FTIR), to assess the content of milk urea nitrogen (MUN) in Brazil. Repeatability and reproducibility of CombiScopeTM FTIR (Delta Instruments), and comparison with an enzymatic automated method (Chemspec® 150; Bentley Instruments) were tested to measure raw milk urea nitrogen (MUN). Additionally, MUN levels stability after storage of raw milk samples at 4ºC, and 20ºC for up to 15 days, and capability and precision to detect extraneous urea added as an adulterant to the milk were evaluated by FTIR equipment. There was a high correlation coefficient for the analysis of MUN by FTIR equipment, when compared with the automated enzymatic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Milk; Validation; Milk urea nitrogen; Infrared spectroscopy; FTIR. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352012000500037 |
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| Dick,Deborah Pinheiro; Martinazzo,Rosane; Dalmolin,Ricardo Simão Diniz; Jacques,Aino Victor Ávila; Mielniczuk,João; Rosa,Alessandro Samuel. |
| O objetivo deste trabalho foi avaliar o efeito residual de queimadas periódicas nos atributos químicos, teor e composição da matéria orgânica de um Latossolo Vermelho e na composição química da vegetação predominante. Os ambientes estudados foram: campo nativo pastejado, sem queima e sem roçada (PN); campo nativo queimado e pastejado (PQ); e mata nativa adjacente à pastagem (MN). As amostras de solo foram coletadas nas camadas 0-5, 0-20, 20-40 e 40-60 cm, para determinação dos atributos de fertilidade, teores de carbono e nitrogênio, e realização das análises de espectroscopia de infravermelho com transformada de Fourier (FTIR). A parte aérea da vegetação desses ambientes foi analisada por análise elementar e FTIR. A queima da pastagem reduziu os teores de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aromaticidade; Composição elementar; FTIR; Mata nativa; Pastagem. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000500011 |
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| Gabriel,Luciana Sutil; Prestes,Rosilene Aparecida; Pinheiro,Luís Antonio; Barison,Andersson; Wosiacki,Gilvan. |
| Pomace, the main by-product of apple juice processing, contains all the fruit's compounds such as minerals, sugars, fibers, enzymes and secondary metabolites after bioprocessing. Dried pomace from four apple varieties (Gala, Fuji, Catarina and Joaquina) was used to extract fructose, glucose, and sucrose, the main soluble sugars contained in apple pomace, to verify the possible use of the sugar fractions. The concentrated sugars were characterized by NMR and FTIR. The partial least squares method (PLS) applied to the NMR and FTIR spectra revealed large amounts of fructose, glucose, and sucrose, without the presence of others compounds. Principal component analysis (PCA) discriminated the studied apple varieties, with a 99% level of significance, as function... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apple pomace; NMR; FTIR; Multivariate analysis. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000300012 |
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| Canellas,Luciano Pasqualoto; Espindola,José Antonio Azevedo; Rezende,Carlos Eduardo; Camargo,Plínio Barbosa de; Zandonadi,Daniel Basílio; Rumjanek,Victor Marcos; Guerra,José Guilherme Marinho; Teixeira,Marcelo Grandi; Braz-Filho,Raimundo. |
| Using herbaceous legumes in agricultural systems yields great quantities of plant residues, allowing changes in soil organic matter quality and content over the years. This study was conducted on an Ultisol, at Seropédica, RJ, Brazil, to evaluate the effects of different perennial herbaceous legumes on soil organic matter quality. A factorial scheme with three replications was used to evaluate the species: forage groundnut cv. BR-14951 (Arachis pintoi), tropical kudzu (Pueraria phaseoloides), and siratro (Macroptilium atropurpureum). After the first cut, each plot was divided into two subplots; plants were cut and left on the soil surface or cut and removed. Soil samples of a closed area covered by spontaneous vegetation (mainly C3 plants) or by Panicum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: FTIR; Fluorescence; Humic acids; Humic substances; 13C. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100010 |
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| Gurdebeke, Pieter R.; Mertens, Kenneth; Bogus, Kara; Marret, Fabienne; Chomerat, Nicolas; Vrielinck, Henk; Louwye, Stephen. |
| The genus Spiniferites currently encompasses 142 dinoflagellate cyst species. Some Spiniferites species are difficult to identify because of an incomplete or doubtful description, and/or substandard iconography. This study re-describes and re-illustrates the Spiniferites holotypes first described by Reid in 1974 Reid PC. 1974. Gonyaulacacean dinoflagellate cysts from the British Isles. Nova Hedwigia. 25:579–637. [Google Scholar]. It also discusses topotype material from surface sediments recovered from British estuaries, and attempts to provide further constraints on the classification of species in this genus using the geochemical characterization of their cyst walls. Reid described four new Spiniferites species: Spiniferites belerius, Spiniferites... |
| Tipo: Text |
Palavras-chave: Dinoflagellate cyst; Redescription; Taxonomy; Geochemistry; Cyst wall composition; FTIR; Dinosporin. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00471/58306/60847.pdf |
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| Gurdebeke, Pieter R.; Mertens, Kenneth; Takano, Yoshihito; Yamaguchi, Aika; Bogus, Kara; Dunthorn, Micah; Matsuoka, Kazumi; Vrielinck, Henk; Louwye, Stephen. |
| Species in the genera Hexasterias and Halodinium have been recorded over the last decades as acritarchs in palynological and/or plankton studies. In paleoenvironmental studies, these resting stages are often interpreted as indicators of freshwater input. The biological affinity of these genera has never been definitely established. Here, a new species, Halodinium verrucatum sp. nov., is described and molecular evidence (single specimen SSU and LSU rDNA sequencing) reveals that both this new species and Hexasterias problematica, collected from sediment samples in the Skagerrak and Baltic Sea, are resting stages of prorodontid ciliates. Additionally, infrared spectroscopic analysis (micro-FTIR) of Hexasterias problematica and Halodinium spp. specimens... |
| Tipo: Text |
Palavras-chave: Acritarch; Ciliate cyst; FTIR; LSU-SSU rDNA; Prostomatida; Taxonomy. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00468/57970/64186.pdf |
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| El-Gamal,Rehab; Nikolaivits,Efstratios; Zervakis,Georgios I; Abdel-Maksoud,Gomaa; Topakas,Evangelos; Christakopoulos,Paul. |
| Background: Many buildings in Egypt e.g. museums, mosques and churches, do not possess controlled environments for minimizing the risks of damage of wooden artifacts due to the growth of fungi. Fungal damage usually appears as change in wood color, appearance of stains, and sometimes deformation of wooden surfaces. In this study we focused on the effect that some fungi exert on the properties of wooden artifacts and evaluated the effectiveness of different concentrations of chitosan on their protection against damage by mold fungi. Results: Samples were collected from different monuments and environments, and fungi growing on them were isolated and identified. The isolated Penicillium chrysogenum, Aspergillus flavus and /Aspergillus niger strains were used... |
| Tipo: Journal article |
Palavras-chave: Archeological wood; Chitosan protection; Crystallinity index; Damage of wooden artifacts; Filamentous fungi; FTIR; Fungal damage; Prevention of fungal growth; UV spectrophotometry; Wood deterioration; XRD. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600011 |
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| Tufail,Saiqa; Munir,Sajida; Jamil,Nazia. |
| ABSTRACT Polyhydroxyalkanoates (PHA) are efficient, renewable and environment friendly polymeric esters. These polymers are synthesized by a variety of microbes under stress conditions. This study was carried out to check the suitability of waste frying oil in comparison to other oils for economical bioplastic production. Six bacterial strains were isolated and identified as Bacillus cereus (KF270349), Klebsiella pneumoniae (KF270350), Bacillus subtilis (KF270351), Brevibacterium halotolerance (KF270352), Pseudomonas aeruginosa (KF270353), and Stenotrophomonas rhizoposid (KF270354) by ribotyping. All strains were PHA producers so were selected for PHA synthesis using four different carbon sources, i.e., waste frying oil, canola oil, diesel and glucose.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Waste frying oil; Polyhydroxyalkanoates; Fluorescence microscopy; FTIR. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000400629 |
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| Ramos,Pablo Martín; Gil,Jesús Martín; Ramos Sánchez,M. Carmen; Navas Gracia,Luis Manuel; Hernández Navarro,Salvador; Martín Gil,Francisco Javier. |
| Rosa rubiginosa L. seed oil has been studied for its application in skin care products, but the chemical nature of seeds, pulp and even leaves, apart from that of oil, is also relevant with a view to the application of this weed for biodiesel production. All these vegetal materials were studied by infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) for characterisation purposes. FTIR bands at 3005, 2924, 1740, 1654 and 1456 cm-1 were used to estimate the iodine index, suitable for biofuels, and the oxidation stability degree. From the viewpoint of the thermal stability, both the seed oil (for which pyrolysis occurs at 462ºC), the raw seeds and the rosehip pulp (with decomposition temperatures of 373ºC and 333ºC, respectively) showed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: A-linolenic acid; DSC; FTIR; Rose hip seed oil; R. rubiginosa. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722016000300003 |
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| Registros recuperados: 21 | |
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