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Bragantia, Volume: 10, Número: 10, Publicado: 1950
  • Produção de álcool de mandioca utilização de bolores na sacarificação do amido

    Teixeira, C. G.

    Resumo em Inglês:

    It has been shown that cassava starch can be converted into alcohol most efficiently when fungal enzyme preparations from submerged cultures are used to hydrolyze the starch into sugar. The use of barley malt in the process for conversion of cassava starch has resulted in alcohol yields of 70-74% of the theoretical. Cassava mashes converted by submerged fungal cultures (Aspergillus niger van Tieghem, strain NRRL-337) resulted in alcohol yields up to 90% of the theoretical. Substitutes for the distillers'dried solubles-corn medium were tried. Screened cotton seed meal and soybean meal proved to be a satisfactory substitute for distillers'dried solubles. Dehydrated cassava meal was effectively used in place of corn meal. A comparative study was carried out using several molds from the Collection of the Instituto Agronômico for the purpose of determining their enzyme activity. The mold that presented the highest enzyme potency was found to be the strain of Aspergillus oryzae (Ahlburg) Cohn strain F-27 which had been originally isolated from saké (rice wine). Studies of the dehydrated residues (7% moisture) from hydrolized and fermented mash were found to contain approximately 25% protein indicating their possible value in animal feeds. Simple substrates can be used for the propagation of the mold which is a very efficient conversion agent. It is, indeed, the best saccharifying agent for the countries where a good malt is not available at a low price.
  • Processo contínuo para fermentações industriais

    Kolachov, Paul; Smith, Le Roy A.; Willkie, H. Frederick; Seagram, Joseph E.
  • Mosaico da citronela

    Costa, A. S.; Lima, A. R.; Jacob, A.

    Resumo em Inglês:

    A type of mosaic is commonly found in experimental fields of the citronella plant (Cyrnbopogon winterianus) in the State of São Paulo. Inoculation tests carried out with the viruses of citronella and sugar cane mosaic showed that the symptoms induced by both viruses on a number of host plants were alike. The results of these tests and those obtained in a comparative study of some properties of the two viruses indicated that the citronella mosaic virus belongs to the sugar cane mosaic virus complex.
  • Análise de um experimento para combate de vira-cabeça do tomateiro

    Fraga Jr., C. G.; Costa, A. S.

    Resumo em Inglês:

    A detailed statistical analysis of a balanced, incomplete block experiment with insecticides to control tomato spotted wilt is given. The effect of the treatments was studied in relation to stand an yield. The angular transformation was used for stand, and the analysis of stand and yield was made with and without the inter-block information. The results indicated that all insecticides tested, viz. Rhodiatox, Fosfern, Hexason 2510 M, Toxaphene, and tartar emetic reduced the number of plants killed by spotted wilt. The higher the concentration of the insecticides the better was the gain in stand. Some insecticides had a detrimental effect on the plant, at, high concentrations. In relation to yield the treatments could be placed in two groups : a) a group in which ilemage caused by the treatment was greater than the benefit, resulting from a better stand with no gain in yield ; b) a group in which there was also a gain in yield.
  • Rachadura dos tubérculos de batatinha Nota

    Boock, O. J.; Costa, A. S.
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