|
|
|
| Registros recuperados: 192 | |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Graner,E. A.; Torres,A. P.. |
| This paper deals with the inheritance of black, blue and blue-splashed plumage in poultry. The material analysed had its origin in the State of Goias, Brazil and the genetical data seems to indicate the interaction of a single pair of genes as in the Andalusian fowls and other blue breeds. The dominant gene for blue egg is also present in the material and selection is now being directed to isolate a breed with blue plumage and blue eggs, named "Tudo Azul", what in Portuguese means all blue (plumage and eggs) and corresponds, in braziliian slang, to the expression "O. K." used in the United States. The commercial possibility of the chickens, as judging by its, laying capacity, is emphasized. |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761949000100007 |
| |
|
|
| Graner,E. A.; Bergamin,A.. |
| The authors tried to check in this experiment the minimum of yellow corn necessary for preventing avitaminosis A in chickens. It was observed, in balanced ration with 50% of corn, that: a) 20% of dent and yellow grains and 30% of flint and white grains were insuficient to prevent avitaminosis A. b) 20% of flint and orange grains and 30% of flint and white grains or 40% of either colored grains and 10% of flint, and white grains did not show evident signs of avitaminosis A during the 12 weeks of the experiment. The ration containing 20% of flint and orange grains is pratically equivalent to the ration containing 40% of dent and yellow grains, regarding the content of pro-vitamina A. However, it was not possible to conclude if these dosage are sufficient to... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761949000100008 |
| |
|
| |
|
|
| Brieger,F. G.; Kerr,Warwick E.. |
| Material: Studies were made mainly with Ascaris megalocephála Cloq. univalens and bivalens, and also with Tityus bahiensis Perty. 1) Somatic pairing of heterochromatic regions. The heterochromatic ends of the somatic chromosomes in Ascaris show a very strong tendency for unspecifical somatic pairing which may occur between parts of different chromosomes (Figs. 1, 2, 3, 7, 10, 11, 12, 13, 14, 16, 18,), between the two ends of the same chromosome either directly (Figs. 4, 5, 7, 8, 11, 12, 13, 15, 16, 17, 18) or inversely (Fig. 8, in the arrow) and also within a same chromosomal arm (Fig. 6). 2) During the early first cleavage division the chomosomes are an isodiametric cylinder (Figs. 6, 9, 11, 13, 14). But in later metaphase the ends become club shaped... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761949000100015 |
| |
|
| |
|
| |
|
|
| Carvalho,A.; Krug,C. A.. |
| The known species of Coffea can be grouped into two categories according to the color of their endosperm which is either green or yellow. The commercially cultivated varieties of Coffea arabica L. and Coffea canephora Pierre ex Froehner are well known for the green color of their seed while the less known varieties of Coffea liberica Hiern and Coffea Dewevrei De Wild, et Th. Dur. have yellow Feed. In 1935, however, a yellow seeded type of C. arabica, was found in Brazil and has been described as Coffea arabica L. var. cera K.M.C. ; it is believed to have originated by mutation from Coffea arabica L. var. typica Cramer. In this paper the authors present the results of a genetic study of the yellow seeded mutant known as "cera". It has been found that in C.... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051949000300005 |
| |
|
|
| Alencar,F. M. Aires de. |
| O autor descreve, neste trabalho, investigações realizadas sôbre as caraterísticas de cobertura e fixação do solo, de dez espécies vegetais. A técnica e o método que empregou consistiram, em síntese, em fazer cortes da parte aérea e em escavar blocos de terra com raízes a determinadas alturas e profundidades, numa área de 0,25 m², de forma a obter a densidade de cobertura do solo pela parte aérea e de travamento pela parte subterrânea, a diferentes distâncias da superfície do solo. Os resultados obtidos levaram às seguintes conclusões preliminares : a) A espécie Paspalum notatum Flügge, compreendendo duas variedades - grama Batatais de fôlha larga e grama Americana de folha estreita, apresentou a maior percentagem em pêso e volume da parte aérea e... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051949000200004 |
| |
|
|
| Mendes,A. J. T.. |
| Um cafeeiro muito rústico e altamente produtivo, encontrado em uma propriedade agrícola do Estado de São Paulo, revelou ser tetraplóide (2n=44). Neste particular êle se assemelha à espécie C. arabica ; porém, em sua auto-esterilidade, se aproxima das espécies diplóides (2n = 22) de café. Imaginou-se, a princípio, que se tratava de uma forma tetraplóide espontânea de C. liberica ou de C. Dewevrei. O estudo aqui apresentado, porém, conduz à conclusão de que se deve tratar de um híbrido entre C. arabica e C. Dewevrei. No estudo da microsporogênese verificou-se a formação de uni- e bivalentes e mais raramente de tri- e tetravalentes. Supondo que o complemento cromossômico desta planta seja constituído de 22 cromossômios arabica haplóides e 22 cromossômios... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051949000100003 |
| |
| Registros recuperados: 192 | |
|
|
|
