The human sex ratio from conception to birth Total female mortality during pregnancy exceeds total male mortality. The unbiased sex ratio at conception, the increase in the sex ratio during the first ... O Steven Hecht,S J William,VR Akmaev,... 被引量: 0发表: 2021年 Human papillomavirus ...
The same-sex sexual behaviors among unmarried male migrants appear to be at high risk of transmission of human immunodeficiency virus (HIV) and sexually transmitted infections (STIs), mainly because of a lack of knowledge of these diseases. Using data from the "Survey on Reproductive Health and...
Sex allocation theory proposes that parents should bias the sex ratio of their offspring if the reproductive value of one sex is greater than that of the other. In the monogamous blue tit (Parus caeruleus), males have a greater variance in reproductive success than females, and high-quality ...
This is believed to be the first report of a canine intersex dog showing male to female sex reversal. Further investigations should identify the autosome and the breaking points of the chromosomal rearrangement. These investigations potentially add to our knowledge of autosomal and X-linked loci ...
With values at age 20 to 39 years as the basis, the single lower limit of normal range of cFT was 0.276 nmol/L, and TT was 11.659 nmol/L. Conclusions The data displayed the changes of sex hormones with aging in Chinese healthy men, and raised the reference value of limit of lowering...
Besides relevance for evolutionary studies of sex determination in amphibians, our results have potential for addressing practical issues in conservation biology because sex reversal by anthropogenic endocrine disruptors is considered one possible cause of amphibian decline. 展开 关键词: amphibians Hyla ...
This study, the third of a multi-part series on male sexual tubes in hermit crabs, the external morphology of the tube of the western Atlantic Catapagurus sharreri A. Milne-Edwards, 1880 is documented using scanning electron microscopy. The male of this species has an unpaired right sexual ...
Gynandromorphy, or the development of organisms with a combination of male and female morphological features, is common in Hymenoptera. The underlying mechanism is likely associated with the sex-determination system, and studying this phenomenon should lead to a deeper understanding of both embryonic ...
These data represent a highly selective tissue-, species-, and sex-specific lesion in male CD-1 mice associated with a cytotoxic metabolite product, 4-OH CTA. In humans, glucuronidation of empagliflozin is the most prevalent metabolic pathway, and oxidation is a minor pathway. Thus, renal ...
Background Although increased prevalence of transfusion transmissible infections (TTI) among "men who have sex with men" (MSM) has been well documented, the exclusion of MSM as blood donors is contested. The aim of this systematic review is to find studies that describe the risk of TTI in MS...