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| Registros recuperados: 218 | |
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| Graner,E. A.; Torres,A. P.. |
| A presente experiência foi realizada afim de se constatar a influência de dois tipos de milho comerciais, com grãos coloridos de amarelo-laranja, como precursores de vitamina A no crescimento de pintos. Um deles, denominado "Cateto", duro, de côr laranja muito forte e outro, chamado "Armour", dente, de coloração amarelo-laranja. Para testemunha foi empregado o milho "Cristal", duro e branco. Uma análise dos pigmentos dos dois tipos de milho com gráos coloridos mostrou que o milho Cateto, com grãos de coloração laranja forte, tem aproximadamente o dobro de pigmentos, tanto total como quanto a parte ativa em relação à vitamina A, quando comparado com o milho dente amarelo-laranja. Três lotes de pintos de 3 semanas foram utilizados, cada um recebendo a mesma... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100016 |
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| Brieger,F. G.. |
| The main object of the present paper consists in giving formulas and methods which enable us to determine the minimum number of repetitions or of individuals necessary to garantee some extent the success of an experiment. The theoretical basis of all processes consists essentially in the following. Knowing the frequency of the desired p and of the non desired ovents q we may calculate the frequency of all possi- ble combinations, to be expected in n repetitions, by expanding the binomium (p-+q)n. Determining which of these combinations we want to avoid we calculate their total frequency, selecting the value of the exponent n of the binomium in such a way that this total frequency is equal or smaller than the accepted limit of precision n/pª{ 1/n1 (q/p)n +... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100012 |
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| Piza Jor.,S. de Toledo. |
| A natural chromosomal race of Tityus babiensis (Scorpiones Buthidae) is described in the present paper. Five males and seven females received from St. Joaquim, State of S. Paulo, gave the following interesting results: All the spermatogonia of the five males were provided with 9 chromosomes of different sizes. All primary spermatocytes showed at metaphase one independent bivalent of normal shape and a complex group formed by 7 chromosomes which have exchanged parts. Some of the chromosomes associated in the complex group, to Judge by their behavior, were composed of fragments of three different chromosomes, being thus paired with three other members of the compound group. The manner in which all the 7 components of the group have paired with each other... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100008 |
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| Piza Jor.,S. de Toledo. |
| Having had the opportunity of studying a male of the species Isometrus maculatus De Qeer (Scorplones, Buthidae) the author was able to observe one of the most interesting anomalies hitherto met with in his investigations on Scorpions. This anomaly consisted in the formation by the primary spermatocyte metaphase chromosomes of a complex group of eight elements, and two independent pairs. As it is clear, the octovalent group resulted from tranlocations involving the members of four chromosome pairs. Since aside the compound group two independent bivalents were always present, 12 was estabilished as representing the diploid chromosome number of the individual, what was soon confirmed by the counts in the spermatogonia. This peculiar behavior of the... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100007 |
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| Castro,G. P. de. |
| The three species studied have 19 chromosomes, being one heterochromosome, one pair of microchromosomes and 8 pairs of autosomes. The microchromosomes of Hypselonotus fulvus are amongst the largest we know. During the synizesis, in Hypselonotus fulvus, we can see in several strands that scape from the chromatic knot a place in which they are widley open. As, in that phase the chromosomes have both ends converging to the same place, the openings suggest a side-to-side pairing of the chromosomal threads. The tetrads are like that studied by Piza (1945-1946). The bivalents are united side by side at their entire length. The unpaired part at the midle of the bivalents gives origin to the arms of the cross-shapede tetrads. The chromosomes have a kinetochore at... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100018 |
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| Torres,A. Di Paravicini. |
| Na Seção Técnica de Avicultura e Cunicultura desta Escola foram feitas durante três anos observações sobre o comportamento da raça Light Sussex, em contraste sobretudo com a Rhode I. Red. Verificou-se ser mais precoce no desenvolvimento, mais pesada, de carne mais tenra, de maior intensidade e menor persistência de postura, de menor fertilidade, do maior precocídade de postura, de maior predisposição ao choco e de maiores ovos. Apresenta boas qualidades de adaptação e criação que a tomam muito recomendável para as pequenas criações caseiras ou dos sitios, no mesmo sistema em que é geralmente criada na Inglaterra. Só excepcionalmente convirá a uma granja industrial preocupar-se com sua criação em larga escala. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100025 |
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| Jardim,W. R.; Trivelin,A. P.. |
| A test was conducted at Poultry Department of "Luiz de Queiroz" School of Agriculture to prove the effect of green feed on egg production. One hundred Rhode Island Red hens at plain laying period were divided in ten pens. The lot A was constituted of pens 1 to 5 and the lot B of pens 6 to 10. During 16 days the pens 1 to 5 did not receive green feed and the pens 6 to 10 received it with abundance. After and for a period of 30 days the situation was inverted. The analysis were made considering, a) the production of all chickens and b) discarding the chickens with irregular laying. In both cases the results were statistically insignificant, proving that green feed did not improve egg production. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100028 |
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| Jardim,Walter Ramos; Bergamin,Armando. |
| The breeds Light Sussex, Rhode Island Red and the hibrid Light Sussex x Rhode Island Red, from the Poultry Department of "Luiz de Queiroz" School of Agriculture, at Piracicaba, S. Paulo, were studied in this paper, Tre authors, analysing eggs, pullets and chick growing arrived to the following conclusion: a) eggs of the Light Sussex breed were haevier; b) the Light Sussex breed was early maturing; c) the cross studied did not show hibrid vigor. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100027 |
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| Leme,Hugo de Almeida; Almeida,Jayme Rocha de. |
| O conhecimento da potência necessária para a moagem da cana de açúcar, é de relevante importância, não só para o fabricante de moendas, como para o usineiro e o tecnólogo. Os autores reportando-se ao processo usado por LEHKY no cálculo da potência dos motores destinados ao acionamento das moendas das usinas de açúcar: 1.° - esclarecem a dedução das fórmulas apresentadas por aquele notável engenheiro dos Estabelecimentos Skoda; 2.° - modificam o fator 1,305 da fórmula original usada no cálculo da potência necessária para vencer o atrito da bagaceira, para 1,2987, quando se considera a velocidade linear dos cilindros em metros por minuto; 3.° - apresentam exemplos numéricos de aplicação direta das fórmulas, para diferentes tipos de moendas, demonstrando que... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100019 |
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| Piza Jor.,S. de Toledo. |
| Lutosa brasiliensis, an Orthopteran Tettigonioidean belonging to the family Stenopelmatidae is referred to in this paper The spermatogonia are provided with 15 chromosomes, that is, 7 pairs of autosomes and a single sex chromosome. One pair of autosomes is much larger than the rest, two pairs are of median sized elements, and four pairs are of small ones. The daughter sex chromosomes show at anaphase great difficulty in reaching the poles, being left for a long while in the region of the equator where they are seen stretched one after the other on the same line or lying side by side in different positions. When the spermatogonium divides each daughter cell gets passively its sex chromosome. Though slowly, the sex chromosome finishes by beins enclosed in... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100010 |
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| Almeida,Jayme Rocha de; Valsecchi,Otávio; Novais,Roberto Fleury. |
| 1 - Colour, by itself, does not constitute a solid ground for judging of the age of a brandy because the more or less pronounced colour it acquires through aging can also be obtained by the addition of oack essence to newly distilled brandy. 2 - Urder the same conditions, colour intensity of a brandy wiU depend upon the nature of the wood and the condition of the storage. 3 - In accordance with the experimental results obtained by the present writers it rests no doubt that fermentation facility ferment resistence, produce and quality of the brendy all are factors depending upon the variety of the sugar cane. In addition, the authors presume that the variety of sugar cane has also influence upon the alteration of composition of the brandy submitted to... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100002 |
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| Piza Jor.,S. de Toledo. |
| In thee present paper the classical concept of the corpuscular gene is dissected out in order to show the inconsistency of some genetical and cytological explanations based on it. The author begins by asking how do the genes perform their specific functions. Genetists say that colour in plants is sometimes due to the presence in the cytoplam of epidermal cells of an organic complex belonging to the anthocyanins and that this complex is produced by genes. The author then asks how can a gene produce an anthocyanin ? In accordance to Haldane's view the first product of a gene may be a free copy of the gene itself which is abandoned to the nucleus and then to the cytoplasm where it enters into reaction with other gene products. If, thus, the different... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100005 |
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| Ranzani,Guido. |
| Studying the application of those methods of microanalysis which avoid costly instalations and atempting to combine high precision with low cost, the author recomends a new method consisting of the following : a) exposure of a surface of 530.66 mm2 of Zn to the action of the acid. b) instalation of 3 series of HgBr2 paper in test tubes with an internal diameter of respectively 3,5 and 9 mm. c - mouting between two slides, covering the margins (with parafin etc.) with parafin in order to conserve the results of the determination without change due to the action of light or moisture. d) the results can be compared at a level of 0.00001 mgr. A203 or 0.000007575 mgr. As. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1947 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761947000100020 |
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| Registros recuperados: 218 | |
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