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Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
25/04/2003 |
Data da última atualização: |
25/04/2003 |
Autoria: |
FERREIRA, M.; RIUL JR. A.; WOHNRATH, K.; FONSECA, F. J.; OLIVEIRA JR. O. N.; MATTOSO, L. H. C. |
Afiliação: |
Instituto de Física de São Carlos, São Carlos, SP.; Embrapa Instrumentação Agropecuária, São Carlos, SP; USP-Escola Politécnica da Universidade de São Paulo, São Paulo, SP. |
Título: |
High-performance taste sensor made from Langmuir-Blodgett films of conducting polymers and a ruthernium complex. |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Analytical Chemistry, Washington, v. 75, p. 953-955, 2003. |
Idioma: |
Inglês |
Conteúdo: |
A sensor arrary made up of nanostructured Langmuir-Blodgett *LB) films is used as an electronic tongue capable of identifying sucrose, quinine, NaC1, and HC1 at the parts-per-billion (ppb) level, being in some cases 3 orders of magnitude below the human thresshold. The sensing units comprise LB films from conducting polymers and a ruthenium complex transferred onto gold Interdigitated electrodes. Impedance spectroscopy is used as the principle of detection, and the importance of using nanostructured films is confirmed by comparing results from LB films with those obtained from cast films. |
Palavras-Chave: |
Artificial taste sensors; Conducting polymers; Films; Langmuir-Blodgett; Ruthenium complex. |
Categoria do assunto: |
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Marc: |
LEADER 01312naa a2200241 a 4500 001 1024684 005 2003-04-25 008 2003 bl --- 0-- u #d 100 1 $aFERREIRA, M. 245 $aHigh-performance taste sensor made from Langmuir-Blodgett films of conducting polymers and a ruthernium complex. 260 $c2003 520 $aA sensor arrary made up of nanostructured Langmuir-Blodgett *LB) films is used as an electronic tongue capable of identifying sucrose, quinine, NaC1, and HC1 at the parts-per-billion (ppb) level, being in some cases 3 orders of magnitude below the human thresshold. The sensing units comprise LB films from conducting polymers and a ruthenium complex transferred onto gold Interdigitated electrodes. Impedance spectroscopy is used as the principle of detection, and the importance of using nanostructured films is confirmed by comparing results from LB films with those obtained from cast films. 653 $aArtificial taste sensors 653 $aConducting polymers 653 $aFilms 653 $aLangmuir-Blodgett 653 $aRuthenium complex 700 1 $aRIUL JR. A. 700 1 $aWOHNRATH, K. 700 1 $aFONSECA, F. J. 700 1 $aOLIVEIRA JR. O. N. 700 1 $aMATTOSO, L. H. C. 773 $tAnalytical Chemistry, Washington$gv. 75, p. 953-955, 2003.
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Embrapa Instrumentação (CNPDIA) |
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Registro Completo
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
21/06/2001 |
Data da última atualização: |
21/06/2001 |
Autoria: |
JAMES, E. K.; OLIVARES, F. L.; OLIVEIRA, A. L. M. de; REIS JÚNIOR, F. B. dos; SILVA, L. G. da; REIS, V. M. |
Título: |
Further observations on the interaction between sugar can and Gluconacetobacter diazotrophicus under laboratory and greenhouse conditions. |
Ano de publicação: |
2001 |
Fonte/Imprenta: |
Journal of Experimental Botany, London, v. 52, n. 357, p. 747-760, apr. 2001. |
Idioma: |
Inglês |
Conteúdo: |
Sugar cane (Saccharum spp.) variety SP 70-1143 was inoculated with Gluconacetobacter diazotrophicus strain PAL5 (ATCC 49037) in two experiments. In experiment 1 the bacteria were inoculated into a modified, low sucrose MS medium within which micropropagated plantlets were rooted. After 10 d there was extensive anatomical evidence of endophytic colonization by G. diazotrophicus, particularly in lower stems, where high numbers of bacteria were visible within some of the xylem vessels. The identity of the bacteria was confirmed by immunogold label- ling with an antibody raised against G. diazotrophicus. On the lower stems there were breaks caused by the separation of the plantlets into individuais, and at these "wounds' bacteria were seen colonizing the xylem and intercellular spaces. Bacteria were also occasionally seen entering leaves via damaged stomata, and subsequently colonizing sub-stomatal cavities and intercellular spaces. A localized host defence response in the form of fibrillar material surrounding the bacteria was associated with both the stem and leaf invasion. In experiment 2, stems of 5-week-old greenhouse-grown plants were inoculated by injection with a suspension of G. diazotrophicus containing 108 bacteria ml-1. No hypersensitive response (HR) was observed, and no symptoms were visible on the leaves and stems for the duration of the experiment (7 d). Close to the point of inoculation, G. diazotrophicus cells were observed within the protoxylem and the xylem parenchyma, where they were surrounded by fibrillar material that stained light-green with toluidine blue. In leaf samples taken up to 4 cm from the inoculation points, G. diazotrophicus cells were mainly found within the metaxylem, where they were surrounded by a light green-staining material. The bacteria were growing in relatively low numbers adjacent to the xylem cell walls, and they were separated from the host-derived material by electron-transparent 'haloes' that contained material that reacted with the G. diazotrophicus antibody. MenosSugar cane (Saccharum spp.) variety SP 70-1143 was inoculated with Gluconacetobacter diazotrophicus strain PAL5 (ATCC 49037) in two experiments. In experiment 1 the bacteria were inoculated into a modified, low sucrose MS medium within which micropropagated plantlets were rooted. After 10 d there was extensive anatomical evidence of endophytic colonization by G. diazotrophicus, particularly in lower stems, where high numbers of bacteria were visible within some of the xylem vessels. The identity of the bacteria was confirmed by immunogold label- ling with an antibody raised against G. diazotrophicus. On the lower stems there were breaks caused by the separation of the plantlets into individuais, and at these "wounds' bacteria were seen colonizing the xylem and intercellular spaces. Bacteria were also occasionally seen entering leaves via damaged stomata, and subsequently colonizing sub-stomatal cavities and intercellular spaces. A localized host defence response in the form of fibrillar material surrounding the bacteria was associated with both the stem and leaf invasion. In experiment 2, stems of 5-week-old greenhouse-grown plants were inoculated by injection with a suspension of G. diazotrophicus containing 108 bacteria ml-1. No hypersensitive response (HR) was observed, and no symptoms were visible on the leaves and stems for the duration of the experiment (7 d). Close to the point of inoculation, G. diazotrophicus cells were observed within the protoxylem and the xylem p... Mostrar Tudo |
Palavras-Chave: |
Bactéria endofítica; Biological nitrogen fixation; BNF; Cana-de-açúcar; Casa de vegetação; Endophytic bacteria; FBN; Fixação bológica de nitrogênio; Greenhouse; Saccharum spp. |
Thesaurus NAL: |
Gluconacetobacter diazotrophicus; sugarcane. |
Categoria do assunto: |
-- |
Marc: |
LEADER 03060naa a2200325 a 4500 001 1598609 005 2001-06-21 008 2001 bl --- 0-- u #d 100 1 $aJAMES, E. K. 245 $aFurther observations on the interaction between sugar can and Gluconacetobacter diazotrophicus under laboratory and greenhouse conditions. 260 $c2001 520 $aSugar cane (Saccharum spp.) variety SP 70-1143 was inoculated with Gluconacetobacter diazotrophicus strain PAL5 (ATCC 49037) in two experiments. In experiment 1 the bacteria were inoculated into a modified, low sucrose MS medium within which micropropagated plantlets were rooted. After 10 d there was extensive anatomical evidence of endophytic colonization by G. diazotrophicus, particularly in lower stems, where high numbers of bacteria were visible within some of the xylem vessels. The identity of the bacteria was confirmed by immunogold label- ling with an antibody raised against G. diazotrophicus. On the lower stems there were breaks caused by the separation of the plantlets into individuais, and at these "wounds' bacteria were seen colonizing the xylem and intercellular spaces. Bacteria were also occasionally seen entering leaves via damaged stomata, and subsequently colonizing sub-stomatal cavities and intercellular spaces. A localized host defence response in the form of fibrillar material surrounding the bacteria was associated with both the stem and leaf invasion. In experiment 2, stems of 5-week-old greenhouse-grown plants were inoculated by injection with a suspension of G. diazotrophicus containing 108 bacteria ml-1. No hypersensitive response (HR) was observed, and no symptoms were visible on the leaves and stems for the duration of the experiment (7 d). Close to the point of inoculation, G. diazotrophicus cells were observed within the protoxylem and the xylem parenchyma, where they were surrounded by fibrillar material that stained light-green with toluidine blue. In leaf samples taken up to 4 cm from the inoculation points, G. diazotrophicus cells were mainly found within the metaxylem, where they were surrounded by a light green-staining material. The bacteria were growing in relatively low numbers adjacent to the xylem cell walls, and they were separated from the host-derived material by electron-transparent 'haloes' that contained material that reacted with the G. diazotrophicus antibody. 650 $aGluconacetobacter diazotrophicus 650 $asugarcane 653 $aBactéria endofítica 653 $aBiological nitrogen fixation 653 $aBNF 653 $aCana-de-açúcar 653 $aCasa de vegetação 653 $aEndophytic bacteria 653 $aFBN 653 $aFixação bológica de nitrogênio 653 $aGreenhouse 653 $aSaccharum spp 700 1 $aOLIVARES, F. L. 700 1 $aOLIVEIRA, A. L. M. de 700 1 $aREIS JÚNIOR, F. B. dos 700 1 $aSILVA, L. G. da 700 1 $aREIS, V. M. 773 $tJournal of Experimental Botany, London$gv. 52, n. 357, p. 747-760, apr. 2001.
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