Phosphite
Mostrando 25-36 de 68 artigos, teses e dissertações.
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25. Crescimento e nutriÃÃo fosfatada do feijoeiro em funÃÃo da aplicaÃÃo de fosfito via radicular e foliar / Growth and phosphated nutrition of bean plant in function of radicular and foliar application of phosphite.
O trabalho foi realizado com o objetivo de avaliar o efeito do fosfito fornecido via radicular e foliar, em comparaÃÃo ao fosfato, sobre o crescimento e nutriÃÃo fosfatada de plantas de feijoeiro. TrÃs experimentos, em delineamento inteiramente casualizado, foram conduzidos em soluÃÃo nutritiva. No primeiro experimento, os tratamentos foram arranjados
Publicado em: 2008
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26. Método titrimétrico para determinar fosfito em amostras agroindustriais
A new titrimetric method for the determination of phosphite in fertilizer samples, based on reaction of H3PO3 with standard iodine solution in neutral media, is proposed. Diluted samples containing ca. 0.4% m/v P2O5 are heated and titrated with 0.05 mol L-1 iodine standard until the solution becomes faint yellow. Back titration is also feasible: a slight exc
Química Nova. Publicado em: 2007-04
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27. Influence of the application of phosphite of potassium in the severity of the Asian rust in the soy / Influência da aplicação de fosfito de potássio na severidade da ferrugem asiática da soja
A ferrugem asiática (Phakopsora pachyrhizi) da soja é uma das doenças mais agressivas que incidem na cultura. Dependendo do clima e da cultivar de soja, perdas severas de rendimento podem ocorrer. O objetivo principal deste estudo foi avaliar o efeito de aplicações de fosfito e dos fungicidas na severidade da doença (porcentagem da área foliar afetada
Publicado em: 2006
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28. Conformational analysis of ortho and meta-acetophenones α phosphonates and their derivatives substituted: α methylthio; α methylsulphinyl: and α methylsulphonyl and reactivity study of substituted ortho and meta α haloacetophenones with triethylphosphite / Análise conformacional de orto e meta-acetofenonas α -fosfonatos e seus derivados: α-metiltio; α:metilsulfinil; e α-metilsulfonil- substituídas e estudo da reatividade de α-haloacetofenonas orto e meta-substituídas com trietilfosfito
This thesis reports the study of the reactivity of the competitive Michaelis- Arbuzov and Perkow reactions of some orto- and meta- substituted α-haloacetophenones (I) [o- and m-Y-Φ-C(O)CH2-Hal] (Hal = CI, Br e I; Y = OMe, Me, H, F, CI, Br and NO2) with triethyl phosphite, by gas chromatography, and the conformational analysis of some orto- and meta-s
Publicado em: 2003
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29. Sinteses estereoseletivas do ent-13(16), 14- espongiadien - 12a-OL e do isocopalano, a partir do 12-isocopalen - 15 - oato de metila
The stereoselective syntheses of ent-13(16),14-spongiadiene-12a-ol (22) and isocopalane (29) using methyl 12-isocopalen-15-oate (25) as a chiral template, which was obtained from the ciclization of the copalic acid. Compound (25) was treated with LiAlH4 followed by MsCl. Elimination of the mesyl group afforded 12,14-isocopaladiene (37). Compound (37) when su
Publicado em: 1981
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30. A convenient approach to the synthesis of medium size oligodeoxyribonucleotides by improved new phosphite method.
Improvement of the new phosphite method for the synthesis of oligodeoxyribonucleotides using the deoxyribonucleoside 3'-bis(1,1,1,3,3,3- hexafluoro-2-propyl) phosphite unit has been carried out via the hydrolysis and capping steps, without any side reaction products. The new phosphite unit and capping agent, bis(1,1,1,3,3,3-hexafluoro-2-propyl)-2-propyl phos
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31. Bacterial Oxidation of Orthophosphite
Malacinski, George (Indiana University, Bloomington), and Walter A. Konetzka. Bacterial oxidation of orthophosphite. J. Bacteriol. 91:578–582. 1966.—A variety of bacteria grown on a glucose and salts medium were capable of utilizing orthophosphite as a sole source of phosphorus. Two organisms, Pseudomonas fluorescens 195 and Serratia marcescens 24, were
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32. Anaerobic utilization of phosphite and hypophosphite by Bacillus sp.
A Bacillus sp. capable of utilizing phosphite and hypophosphite under anaerobic conditions was isolated from Cape Canerval soil samples. The organism was isolated on a glucose-mineral salts medium with phosphate deleted. Anaerobic cultivation of this isolate resulted in decreases in the hypophosphite or phosphite concentration, increases in turbidity, cell c
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33. Molecular Genetic Analysis of Phosphite and Hypophosphite Oxidation by Pseudomonas stutzeri WM88
The first molecular and genetic characterization of a biochemical pathway for oxidation of the reduced phosphorus (P) compounds phosphite and hypophosphite is reported. The pathway was identified in Pseudomonas stutzeri WM88, which was chosen for detailed studies from a group of organisms isolated based on their ability to oxidize hypophosphite (+1 valence)
American Society for Microbiology.
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34. Filter disc supported oligonucleotide synthesis by the phosphite method.
The phosphite approach to oligodeoxynucleotide synthesis has been applied to the filter disc support. The method is exemplified here by the preparation of eight decadeoxynucleotides.
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35. Genetic Diversity and Horizontal Transfer of Genes Involved in Oxidation of Reduced Phosphorus Compounds by Alcaligenes faecalis WM2072
Enrichment was performed to isolate organisms that could utilize reduced phosphorus compounds as their sole phosphorus sources. One isolate that grew well with either hypophosphite or phosphite was identified by 16S rRNA gene analysis as a strain of Alcaligenes faecalis. The genes required for oxidation of hypophosphite and phosphite by this organism were id
American Society for Microbiology.
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36. A combined use of triphenyl phosphite and 2,2′-dipyridyl diselenide as a coupling reagent in oligonucleotide synthesis
Oligonucleotides and nucleoside phosphoramidates can be synthesized in high yields by a combined use of triphenyl phosphite and 2,2′-dipyridyl diselenide as a coupling reagent.