Ammonium 15n
Mostrando 37-48 de 152 artigos, teses e dissertações.
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37. Produção de sulfato de amônio duplamente marcado com os isótopos estáveis 15N e 34S
The purpose of this work was the production of ammonium sulfate double labeled with 15N and 34S ((15NH4)2(34)SO4)), employing the ion exchange technique in two different processes. The first one was carried out using Na2(34)SO4 and (15NH4)2SO4 previously enriched. It was possible to obtain about 54g of (15NH4)2(34)SO4 from 70.0g of Na2(34)SO4 and 64.2g of (1
Química Nova. Publicado em: 2005-03
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38. Corn fertilization with ammonium sulfate in a Brasília Cerrado soil under Brachiaria decumbens pasture. / Fertilização com sulfato de amônio na cultura do milho em um solo de cerrado de Brasília sob pastagem de Brachiaria decumbens.
Crop/livestock integration systems have been adopted in the cerrados, since this is a technology for pasture recovery and renovation, used in association with annual crops, such as corn. In this system, the pasture is recovered and maintained productive by crop fertilization. Nitrogen is prominent among the nutrients applied in fertilizations; it undergoes s
Publicado em: 2005
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39. Nitrogênio e enxofre na recuperação de pastagem de capim-Braquiária em degradação em Neossolo Quartzarênico com expressiva matéria orgânica / Nitrogen and sulphur for the recovery of a Signal grass under degradation in on Entisol with expressive organic matter content
Nitrogen is required for pastures establishment, maintenance and production recovery, and its effect has depended on sulphur supply, for the relationship between these nutrients in plant metabolism. The objectives were: a) to study the combinations between nitrogen and sulphur rates in soil with Signal grass (Brachiaria decumbens) under degradation; b) to ev
Publicado em: 2005
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40. PurificaÃÃo e caracterizaÃÃo da lectina da vagem de Caesalpinia ferrea (cfepl): aplicaÃÃo biolÃgica
Lectins are proteins that bind specifically and reversibly to carbohydrates. Caesalpinia ferrea is a leguminous tree widely distributed in Brazil used in popular medicine. The aim of this work was the purification and characterization of C. ferrea pod lectin (CfePL). Pod extract (E) in 0.15 M NaCl was partially purified on activated charcoal followed by ammo
Publicado em: 2004
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41. SÃntese e caracterizaÃÃo de novos derivados mesoiÃnicos para aplicaÃÃo de Ãptica nÃo-linear e atividade biolÃgica
Mesoionic compounds constitute a group of heterocyclic betaines stabilized by delocalisation of electrons and charge, the synthesis of which has proven of great interest. This stemmed from (a) their wide range of biological activity with a considerable possibility of obtaining pharmaceuticals; (b) their special physical properties for non-linear optics appli
Publicado em: 2004
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42. Preparación y caracterización de la zeolita MCM-22 y de su precursor laminar
The layered precursor of MCM-22 was prepared with different Si/Al ratios: 15, 25, 50, 100 and ¥. Upon heat treatment these precursors form MCM-22 zeolite. Both layered precursor and MCM-22 zeolite were characterized by several techniques: Chemical Analysis by Atomic Absorption Spectroscopy (AAS), X-Ray Diffraction (XRD), Thermo-gravimetric Analysis (TGA), P
Química Nova. Publicado em: 2003-12
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43. Gerenciamento de resíduos químicos e águas servidas no laboratório de isótopos estáveis do CENA/USP
A system for disposal and recovery of the main effluents and chemical waist from isotope separation plants and enriched compounds-15N and 34S production has been carried out at the Stable Isotope Laboratory (LIE) of the CENA/USP. Around four hundred thousand liters of effluents has been recovered yearly. Among the recovered chemical wastes, the more relevant
Química Nova. Publicado em: 2003-08
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44. Produção de [beta]-1,3 glucanases, proteases liticas e quitinases por microrganismos e aplicação na lise de leveduras
The aim of this work was the study of b-1,3 glucanases, proteases and chitinases production by B1, B22, B26, FXX, Oerskovia sp. nO4 and Cellulomonas cartae nº191 strains in culture media containing differents inductors as well as their application on yeast cell lysis. The strains B26 and Cellulomonas cartae nO191 showed highest protease production using the
Publicado em: 2003
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45. Isolamento, caracterizaÃÃo parcial e atividades biolÃgicas da lectina de entrecasca de aroeira (Schinus terebinthifolius Raddi.)
Bark infusions of Schinus terebinthifolius Raddi., Anacardiaceae family (aroeira), have been commonly used in popular medicine. Lectins constitute a heterogeneous protein group capable of recognizing and reversibly bind to carbohydrates. The aim of this work was to isolate a bark lectin from S. terebinthifolius and to evaluate its biological properties. Extr
Publicado em: 2002
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46. Kinetic characterization of the (Na+,K+)-ATPase from the gill microsomal tissue of the swimming crab Callinectes danae (CRUSTACEA, PORTUNIDAE). / Caracterização cinética da (Na+, K+)-ATPase da fração microsomal de tecido branquial de Callinectes danae (CRUSTACEA, PORTUNIDAE)
A caracterização bioquímica da (Na+,K+)-ATPase, uma importante enzima envolvida no controle osmo-iônico nos crustáceos osmorreguladores, foi realizada a partir de centrifugação diferencial de frações microsomais do tecido branquial do siri eurialino C. danae, coletado na Baía de Ubatuba e mantido a 33o/oo de salinidade (animais recém-capturados).
Publicado em: 2002
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47. Metodologia para determinação de corantes artificiais em alimentos por cromatografia liquida de alta eficiencia
The control of level of synthetic dyes food isn t a routine procedure, specially by the lack of adequate methodology capable of answering the demand of the number of analyses and the quantitatives determination in the most different kinds of food, besides making available to the implantation in control labs in our country. Trying to overcome this problem, it
Publicado em: 1998
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48. Desenvolvimento de uma metodologia espectrofotométrica para determinação de chumbo em sangue.
In the present work, a new analytical methodology was developed to determine Pb in blood using molecular spectrophotometry. The method uses 2-(5-bromo-2-piridylazo)-5-dietylaminophenol (5-Br-PADAP) as a chelating agent. The content of the final measuring solution is the following: 5-Br-PADAP 1.2x10-4 M; ethylic alcohol 50 % in volume; Triton X-100 0.15 %; ni
Publicado em: 1996