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SciELO - Scientific Electronic Library Online (52.285 recursos)
SciELO (Scientific Electronic Library Online) is an electronic library covering a selected collection of Brazilian scientific journals. The objective of the site is to implement an electronic virtual library, providing full access to a collection of serial titles, a collection of issues from individual serial titles, as well as to the full text of articles. The project envisages the development of a common methodology for the preparation, storage, dissemination and evaluation of scientific literature in electronic format.

Mostrando recursos 1 - 20 de 112

1. Chromosome polymorphism in Ctenomys minutus (Rodentia-Octodontidae) - Freitas,Thales Renato O. de
Eight karyotypes (2n = 42, 45, 46a, 46b, 47, 48, 49 and 50) were found.

2. A new allele of peptidase-B in cattle - Lara,Maria Aparecida Cassiano; Contel,Eucleia Primo B.
Electrophoretic analyses of peptidase-B were carried out on red cell hemolysates from Holstein, Mantiqueira and Gyr cattle, using cornstarch, known in Brazil as Penetrose-30.

3. A comparative study of eleven protein systems in tamarins, genus Saguinus (Platyrrhini, Callitrichinae) - Meireles,Carla; Sampaio,Iracilda; Schneider,Horacio; Ferrari,Stephen F.; Coimbra-Filho,Adelmar F.; Pissinatti,Alcides; Schneider,Maria P.C.
The genetic variability of six tamarin taxa, genus Saguinus, was analyzed comparatively using protein data from eleven systems coded by 15 loci.

4. Recuperation and improvement of chromosome preparations stained with silver nitrate - Sanchez,S.; Cano,J.; Fenocchio,A.S.
We used potassium ferricyanide to remove AgNO3 salts in cases of excessive chromosome impregnation.

5. Preparation of mitotic chromosomes of leaf-cutting ants from the genera Atta and Acromyrmex - Santos-Colares,M.C.; Viégas,J.; Roth,M.G. Martino; Loeck,A.E.
The brain ganglia of prepupae were dissected in a 0.0025% hypotonic solution of colchicine, placed on a glass slide on a cold plate (4 ± 1oC) for 20 min.

6. Chromosome number in germplasm accessions of Paspalum notatum (Gramineae) - Pozzobon,Marisa T.; Valls,José Francisco M.
Chromosome numbers are reported for 127 germplasm accessions of Paspalum notatum maintained by EMBRAPA (Empresa Brasileira de Pesquisa Agropecuária) in two research centers in Brazil.

7. Predicting the range of inbreeding depression of inbred lines in cross-pollinated populations - Souza Jr.,C.L.; Fernandes,J.S.C.
The objectives of this paper were to derive the genetic variance of inbreeding depression ( ) and to predict the range of inbreeding depression (RID) in cross-pollinated populations.

8. Callus induction and plant regeneration by Brazilian triticale and wheat genotypes - Dornelles,A.L.C.; Carvalho,F.I.F.; Federizzi,L.C.; Handel,C.L.; Bered,F.; Sordi,M.E.B.; Schneider,F.
In order to determine the in vitro behavior of Brazilian triticale, 16 triticale genotypes, and three wheat genotypes used as checks, were sown in June 1994.

9. Induction of mutations for earliness in the soybean cultivar Paraná - Tulmann Neto,A.; Alves,M.C.
Plants flowering earlier than Paraná were selected at the M3 generation.

10. Genetic control of characters associated with bean golden mosaic geminivirus resistance in Phaseolus vulgaris L. - Pessoni,Luis Alberto; Zimmermann,Maria José de O.; Faria,Josias Corrêa de
Seedlings of the four parents, six F1 hybrids, 12 backcrosses, and F2 generations for each combination were inoculated on the eighth day after sowing by exposure to a viruliferous whitefly (Bemisia tabaci Genn.) population for 24 h, in a glasshouse, prior to transplantation to field conditions.

11. Inheritance of anthracnose resistance in common bean genotypes P.I. 207262 and AB 136 - Gonçalves-Vidigal,M.C.; Cardoso,Antônio A.; Vieira,Clibas; Saraiva,Luiz S.
207262 carries duplicate dominant genes for resistance to the delta race; AB 136 carries a dominant gene.

12. Multivariate genetic divergence and hybrid performance of cacao (Theobroma cacao L.) - Dias,Luiz Antônio dos Santos; Kageyama,Paulo Yoshio
Over a five-year period (1986-1990), five cultivars of the S1 generation, pertaining to the Lower Amazon Forastero and Trinitario racial groups and 20 crosses between the corresponding S0 parents were analyzed, based upon five yield components - number of healthy and collected fruits per plant (NHFP and NCFP), wet seed weight per plant and per fruit (WSWP and WSWF), and percentage of diseased fruits per plant (PDFP).

13. Mapping of a novel viviparous unstable mutant of maize (vp 12) - Araujo,Paula G.; Silva,William J. da; Maluf,Mirian P.; Prioli,Laudenir M.
A new viviparous mutant of maize (Zea mays L.), associated with genetic instability and designated viviparous-12 (vp12), was identified in a synthetic Tuxpeño adapted to tropical regions.

14. Intra and interspecific variability of in vitro culture response in Lycopersicon (tomatoes) - Pratta,Guillermo; Zorzoli,Roxana; Picardi,Liliana Amelia
Intra and interspecific variability was measured in the genus Lycopersicon for the traits: productivity rate (PR, total number of regenerated shoots/total number of cultures), regeneration percentage (%R, number of cultures regenerating shoots or primordia/total number of cultures) and callus percentage (%C, number of cultures only producing callus/total number of cultures).

15. Chromosome sensitivity to bleomycin in G2 lymphocytes from Down syndrome patients - Bartholomei-Santos,Marlise Ladvocat; Lucca,Edmundo José de
Several studies have demonstrated that lymphocytes from patients with Down syndrome (DS) exhibit an increased frequency of chromosome aberrations when they are exposed to ionizing radiation or to chemicals at the G0 or G1 phases of the cell cycle, but not at G2, when compared to normal subjects.

16. Cytogenetic study of 50 Brazilian patients with primary myelodysplastic syndrome - Fernandez,Teresa de Souza; Silva,Maria Luiza M.; Souza,Jamison M. de; Tabak,Daniel; Abdelhay,Eliana
Patients with refractory anemia, or refractory anemia with ringed sideroblasts, presented normal karyotypes or single abnormalities such as del(5q) or -Y, while patients with refractory anemia with an excess of blasts, refractory anemia with an excess of blasts in transformation or chronic myelomonocytic leukemia showed complex karyotypes and single abnormalities involving chromosomes 7 or 8, which are related to a bad prognosis and an elevated risk of evolution to acute myeloid leukemia.

17. Family names and the length of the Y chromosome in Brazilian blacks - Barbosa,Ana A.L.; Cavalli,Iglenir J.; Abé,Kiyoko; Santos,Maria G.; Azevêdo,Eliane S.
The variability of the lengths of the heterochromatic and euchromatic segments of the human Y chromosome was studied by a quantitative method of densitometric measurement in 60 normal and unrelated black individuals (30 with and 30 without devotional surnames), living in Salvador, Bahia, northeastern Brazil.

18. Interphase cytogenetics using fluorescence in situ hybridization: an overview of its application to diffuse and solid tissue - Hackel,Christine; Varella-Garcia,Marileila
Interphase cytogenetics, utilizing fluorescence in situ hybridization (FISH) techniques, has been successfully applied to diffuse and solid tissue specimens.

19. Looking ahead: some genetic issues of the future - Neel,James V.

20. The genomic organization and complete sequencing of the human T-cell receptor b locus - Passos Jr.,Geraldo A.S.

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