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At least 325 records · Page 18Linked to original sources
PubMed1976

Habitat and reproductive behavior of Trichinella spiralis.

The normal niche of Trichinella spiralis adults was found to be in the epithelial layer of the mucosa of the small intestine of its host. Most worms were found in the epithelium at the base of the villi and in the glandular crypts. Copulation and insemination occurred between 30 and 32 hr postinfection, all although these acts were never observed, it was concluded that copulation and insemination took place in the epithelial layer of the mucosa. A majority of the adults were found to be completely embedded in the epithelium during the deposition of the motile larvae. Motile larvae were deposited in this location and from there migrated through the stroma to venules and lymphatic vessels. Male T. spiralis were found to be capable of inseminating at least 4 females.

Animals↗
PubMedDate not supplied

[Reproductive behavior and Down syndrome].

Coital rates and contraception practice were investigated in mothers of 160 newborns with Down syndrome (DS) in comparison with the same aged (+/- 1 year) mothers of 160 healthy newborns. A considerable lowering of sexual activity is typical for parents, especially young ones, of children with DS. No relationship between parental sexual behavior and maternal hormonal dysfunction was found. Study on children sex ratio (SR) in relation to parental sexual activity revealed that the prevalence of boys in the DS children was due to the excess of boys (SR = 1.85) in the small group of children from sexually active couples. These data are discussed as evidence of association of a high coital rate with chromosome malsegregation in spermatogenesis.

Coitus↗
PubMedDate not supplied

Employment and the sexual and reproductive behavior of female adolescents.

CONTEXT: Women's employment opportunities may reduce the risk of early intercourse and pregnancy, but some evidence has linked adolescent employment and problem behaviors with early intercourse. METHODS: Hazard regression analyses of data from the National Longitudinal Survey of Youth were used to examine the relationship between employment and the risk of first intercourse before age 20 among women who were aged 14-16 in 1979. The relationship between employment and the risk of a first, nonmarital pregnancy among sexually experienced young women was also assessed. RESULTS: Current employment and cumulative months of past employment are associated with increased hazards of first intercourse (hazard ratios, 1.20 and 1.01, respectively); this association is particularly strong for white young women. Adolescents who work more than 120 hours a month are significantly more likely than nonworking adolescents to experience first intercourse (1.4). Although current employment has no effect on the likelihood of a first, nonmarital pregnancy among white adolescents, it is associated with an increased risk of pregnancy among blacks and with a reduced risk of pregnancy among Hispanics. CONCLUSIONS: Program planners and policymakers should be aware of the potential association between adolescent employment, particularly intense employment, and the likelihood of initiating intercourse and experiencing pregnancy, even if causality is still unclear.

Adolescent↗
PubMed2002

[Change in reproductive behavior in Germany compared with the rest of Europe].

When the processes involved in the decline of the birth rate are analysed very often no distinction is made between voluntary and involuntary childlessness. The article presents a comparative overview of the international development of fertility and highlights the consequences of this development in Europe. In the second part of this article the development of the birth rate in Germany and its consequences are discussed.

Adult↗