Reply to ‘Influences of maternal weight on the secondary sex ratio of human offspring’
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چکیده
منابع مشابه
Influences of maternal weight on the secondary sex ratio of human offspring.
BACKGROUND Less than optimal reproductive conditions may be associated with a secondary sex ratio biased towards females. Body weight represents a critical determinant of reproduction. Accordingly, we evaluated whether preconception body weight and weight gain during pregnancy influence the sex ratio of human offspring. METHODS A retrospective study was performed on 10 239 births in 1997-2001...
متن کاملP-53: Maternal Diet, Vaginal pH and Time of Ovulation Effects on Offspring`s Sex Ratio
Background Although there are different ways to achieve the desired sex of the fetus, most of those are not completely effective. This paper reports a study on human to check the theories which hypothesize that high potassium maternal diet, douching with alkaline substance to change vaginal PH and intercourse around ovulation affects the sex ratio of the progeny MaterialsAndMethods A quasi-expe...
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cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
The sex ratio of human births related to maternal age.
Data from the Annual Reports of the Registrar-General for England an d Wales (1939-1947) and for Scotland (1939-1947) were examined to determine the relationship of sex ratio to maternal age. Sex ratios of total births and live births decrease with maternal age; sex ratios of stillbirths increase. The increase in the sex ratio of stillbirths with maternal age accounts for the difference betwe...
متن کاملthe evaluation and comparison of two esp textbooks available on the iranian market for teaching english to the students of medicine
abstract this study evaluated and compared medical terminology and english for the students of medicine (ii) as two representatives of the textbooks available on the iranian market for teaching english to the students of medicine. this research was performed on the basis of a teacher’s and a number of students’ attitudes and the students’ needs analysis for two reasons: first, to investigate...
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ژورنال
عنوان ژورنال: Human Reproduction
سال: 2004
ISSN: 1460-2350,0268-1161
DOI: 10.1093/humrep/deh364