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| Registros recuperados: 406 | |
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| Catani,R. A.; Gloria,N. A. da; Bergamin Filho,H.. |
| O presente trabalho relata os dados obtidos na determinaçao do zinco em plantas segundo uma nova técnica. Esta nova técnica consistiu em se aliar a separação do zinco de outros interferentes, através do emprego de uma coluna de resina trocadora de anions, ao método polarografico da dosagem do citado elemento. A amostra de planta (1, 000g) foi incinerada em copo de Pyrex a 450-5009C durante 90 minutos e o zinco foi extraido da cinza com solução de HC1 2N. A separação do zinco de outros elementos interferentes foi feita pela passagem da solução através da resina trocadora de anions, Amberlite, IRA-401. Após a eluiçao do zinco da coluna, a solução obtida foi levada ao polarografo registrador. (Sargent, modelo XXI) para a determinação, Trabalhando-se com um... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100008 |
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| Pellegrino,D.; Catani,R.A.; Bergamin Filho,H.; Glória,N.A.. |
| The status of zinc in sugar cane, variety Co 419, troughout its life cyle, was studid in samples cut monthly, from the 6th to 15th month, from an experiment carried on under the conditions of soil and climate prevailing in Piracicaba, State of São Paulo, Brazil. The experiment consisted of 6plots, 3 fertilized and 3 unfertilized. The fertilized ones received 40 kg of N (ammonium sulfate), 100 kg P2O5 (superphosphate) and 40 kg K2O (potassium cloride) per hectare, just before planting. The zinc content was determined by the Zincon method, after separation of zinc from other ions by means of the ion Exchange Resin III, Merck. The results obtained show that there was a tendency to decrease the zinc level in the stalks, whereas it kept more or less constant in... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100019 |
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| Barros,Myrtes A. Adâmoli de. |
| In this paper domatia of 53 species of the families Caprifoliaceae, Valerianaceae, Dispsaceae and Adoxaceae, all of the Order Rubiales, were studied. In fifteen species belonging to five genera the author found domatia. They were of two types, in the "touffe de poils" and "em pochette", in accordance with the CHEVALIER e CHESNAIS Domatia Classification (1941). Only two species had domatia of the type "em pochette" and the other thirteen had domatia in "touffe de poils" or variations of this type. The author found in this paper, by the first time, domatia in the insertion of the pinna with the rachis in Valeriana scandens L. var. genuina e Valerianopsis sp., and in the place between leaf lets and petiole in Valeriana acutifolia and Valeriana sp. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100009 |
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| Pellegrino,D.. |
| Este trabalho teve por objetivo o estudo do método de separação do zinco dos outros elementos por meio de resina trocadora de ânions (III, Merck), e a sua determinação colorimétrica por meio do Zincon, em vegetais. Estudou-se particularmente: 1 - estabilidade do complexo; 2 - formação do complexo em diversos pH; 3 - a influencia da concentração de ácido clorídrico na adsorção do zinco pela resina; 4 - efeito do volume de KC1 e NaNO3 na eluição do zinco ; 5 - influência de outros íons; 6 - exatidão e precisão do método; 7 - estudo comparativo de três métodos de preparo do extrato de vegetais. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100017 |
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| Santos,Clóvis Ferraz de O.; Nogueira,Izaias O.. |
| This paper deals with the macroscopic and microscopic observation of the growth ringe in two disks from the crossing section of wood stem of Tecoma chrysothrica and also deals with statistical analysis of the size of fiber and vessel member in different grow rings of secondary xilem. By statistical analyses of variance the authors verified the following: first, the fiber reaches its utmost length at the 11 th and 12 th grow rings; second, the vessel member reaches its utmost width in the same region as the fiber length. This point out there is certain correlation between the width of vesses member with the fiber length at the same growth rings. There was no statistical signification in the variation of the vessel length and the fiber width. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100004 |
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| Catani,R. A.; Perez,J. T.; Bergamin Filho,H.. |
| O presente trabalho relata os dados relativos a análise qualitativa e quantitativa do precipitado, que se forma quando se adiciona a uma solução contendo estrôncio, dicromato de potássio, em meio amoniacal e hidroalcoólico. Em lugar de se formar cromato de estrôncio simples, SrCrO4, forma-se um cromato que além do estrôncio, contém os ions amônio e potássio. Soluções padrões contendo desde 1, 8 até 50,5 mg de estrôncio, foram tratadas com solução de dicromato de potássio 2 normal, amoníaco e solução hidroalcoólica com 95% de álcool absoluto. O precipitado foi pesado e a equação de regressão que relaciona o peso do estrôncio colocado e o peso do precipitado obtido, e a seguinte: Y = 4,58 X + 0, 84, onde: X é o pêso em miligramas, do estrôncio colocado Y é o... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100016 |
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| Menard,L. Neptune; Malavolta,E.. |
| The present work was carried out in order to study: 1 - The effect of several levels of P and Fe on the chemical composition of young coffee plants (Coffea arabica L., var. Caturra, KMC); 2 - The influence of P and Fe in the up take of N, K, Ca, and Mg as revealed by the chemical analyses of coffee tissues. Five treatments with two replicates were used, namely: 1 - Control - plants grown in the solution 2 of HOAGLAND & ARNON (1950); 2 - Omission of P; 3 - 310 p. p.m. of P; 4 - Omission of Fe; 5-28 p. p.m. of Fe. The experiment was carried out in the grenhouse, the pH of the different solutions being kept between 5. 0 and 5. 5; aeration was provided to the solutions. The following conclusions wen drawn: 1 - When P was omitted from the nutrient... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100002 |
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| Pellegrino,D.; Catani,R.A.; Bergamin Filho,H.; Glória,N.A. da. |
| In this paper the authors have studied the manganese absorption by the sugar cane plant, variety Co 419, in samples cut monthly, from the 6th to 15th month of life in the climate prevailing at Piracicaba, State of Sao Paulo, Brazil. From October to February (6 th to 10 th month of the plant life), which coincided with the rainy season, the manganese content was higher in the stalk than in the leaves, for both treatments, fertilized and unfertilized. There was a sharp decrease in manganese content in the stalks, after February, in both reatments. In the leaves there was little variation in manganese content throughout the plant tissue. The stalks from the unfertilized plots had a larger variation in manganese content, specially from the 6 th to the 10 th... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1962 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761962000100018 |
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| Registros recuperados: 406 | |
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