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| Registros recuperados: 189 | |
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| Piza,S. de Toledo. |
| A short, report on the chromosomes of three species of Brasilian Orthoptera is given in the present paper. Meroncidius intermedins Brunner, belonging to the Pseu-dophyllidae, differs from the species already studied in the Family in having 30 instead of 34 autosomes and a metacentric sex chromosome. "Of the autosomes, 4 showed to be metacentric. The author believes that the present species may be originated from one having 34 acrocentric autosomes by means of centric fusions. The origin of ths metacentricity of the X is not discussed. Oxyprora flavicornis Redtb.,belonging to the Copiphori-dae, has spermatogonia with 29 chromosomes. Of the autosomes, 4 seemed to be metacentric. The X has the form of a V of subae-qual arms. Neoconocephálus injuscatus... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1950 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761950000100017 |
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| Graner,E. A.; Torres,A. P.. |
| Four years of inbreeding and its effects on fertility, hatchability, viability and egg production in the new bred "PPPP" (Pescoço Pelado Preta Piracicaba) (naked neck and black plumage, Piracicaba) were reported in this paper. It was observed a decrease in fertility, hatchability, viability and egg production as the inbreeding increases. The black plumage naked neck homozygozous chickens are now submitted to a system of uncontrolled mating in the hope that the natural selection will reduce some of the undesirable factors providing abundant material for pedigree control. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1950 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761950000100007 |
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| Nogueira,Izaias Rangel. |
| The author proves that equation, Σy n ΣZx | ΣxyZx ΣxZx ΣxZ2x | = 0, Σy ΣZx Σy2x | where Z = 10-cq and q is a numerical constant, used by Pimentel Gomes and Malavolta in several articles for the interpolation of Mitscherlih's equation y = A [ 1 - 10 - c (x + b) ] by the least squares method, always has a zero of order three for Z = 1. Therefore, equation A Zm + A1Zm -1 + ........... + Am = 0 obtained from that determinant can be divided by (Z-1)³. This property provides a good test for the correctness of the computations and facilitates the solution of the equation. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1950 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761950000100014 |
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| Leme Junior,Jorge; Malavolta,E.. |
| The photometric determination of ascorbic acid with the "E. E. L. portable colorimeter" can be carried" out rapid and conveniently using either 3% HPO3 or 0,4% (COOH) 2 as protective agent. The standards would contain from 2 to 20 micrograms of ascorbic acid per ml of metaphosphoric or oxalic acid solutions. We mix 10 ml of these solutions with 3 ml of the adequate citrate buffer solutions, and we pipet 5 ml of the resulting mixture to a matched test tube containing 5 ml of sodium - 2,6 - dichlorobenzenoneindophenol (80 mg per liter); then we shake well and after 15 seconds the extintion is read using green filter. The readings are subtracted from the blank one. Designating the differences by x and the concentrations of ascorbic acid/ml in the standards by... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1950 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761950000100016 |
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| Registros recuperados: 189 | |
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