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At least 109 records · Page 6Linked to original sources
PubMed1992

[Changes in the contraceptive method mix during fertility decline: Latin America and the Caribbean].

"This paper reviews survey-based data regarding contraceptive prevalence and methods employed in Latin America and the Caribbean, with an emphasis on changes in the mix of methods over time. The most striking recent trend is the rise in use of female sterilization.... By contrast, use of male sterilization remains negligible in most countries. The oral contraceptive pill is by far the most popular of the temporary methods, though its prevalence has more often declined than increased in recent years. Together female sterilization and the pill make up around [two-thirds] of contraceptive practice in Latin America and the Caribbean." (SUMMARY IN ENG)

Americas↗
PubMed2004

Use of 2n gametes for the production of sexual polyploids from sterile Oriental x Asiatic hybrids of lilies (Lilium).

Sixteen Oriental and 12 Asiatic cultivars were crossed in 158 different combinations. A total of 708 F1 hybrids were obtained from 86 of the different combinations of 15 Oriental and 11 Asiatic cultivars. Because the Lilium cultivars (2n=2x=24) used for the production of these hybrids belong to two different taxonomic sections-Archelirion (0) and Sinomartagon (A), respectively-the F1 hybrids (OA) could be obtained only through embryo, embryo sac rescue, ovary slice or ovule culture. Most of the F, hybrids were highly sterile (did not produce viable n gametes) due to the failure of chromosome pairing. However, in a few cases F1 plants were found that produced viable 2n pollen at variable frequencies. These 2n pollen grains were successfully used for the production of backcross progenies. Using genomic in situ hybridization we found intergenomic recombinant chromosomes in the sexual polyploid progenies. These results indicate that there are effective prospects for combining important horticultural traits from the two main groups of cultivars of lilies through sexual polyploidization.

Chromosome Mapping↗
PubMed1981

Sex-hormones in Neurospora crassa. Differences in the biological property of the hormonal extracts of fertile and sterile strains.

Sexual hormones, isolated from the wild strains and sterile mutants of Neurospora crassa, were used for the improvement of fertility of sterile crosses, i. e., St. L. a X7232-A, St. L. a X 9312-A and St. L. A X 8455-a. Improvement of fertility was observed in case of the cross St. L. a X 9312-A. Of the different extracts, hormonal substances present in the extract of 7232-A (sterile mutant) and also of the wild types (Em A, Em a, St. L. A, St. L. a) exerted the most prominent effects. For the extracts of other mutants such a conclusion was difficult to draw. The implications of these findings are being discussed.

Cell Division↗
PubMed1996

[Contraceptive choices and experience of sexuality: a comparison between sterilized and non-sterilized women in a metropolitan area of southeastern Brazil].

A cross sectional study involving 357 women, 174 of them sterilized and 183 non-sterilized, with a view to comparing their sexual and reproductive behaviour, was undertaken. The questionnaire was based on previous focus group discussions with both women and men, to find out the best way to approach related questions. The results show that sterilized women-who are older and more often have steady partnerships than non-sterilized women-fulfil traditional gender roles more closely than the others. Furthermore, no sterilized woman had used the condom in the month prior to the interview. It is suggested that public messages for the prevention of the spread of the HIV, sexually-transmissible disease and cervical cancer should target women who have been sterilized for the purpose of increasing the use of the condom in accordance with specific strategies.

Adult↗