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The specific activity and K(m) of ovarian alkaline phosphatase increased during normal maturation. The Michaelis constant ceased to increase as sexual ... TA Bramley 被引量: 0发表: 2019年 LIFE HISTORIES AND REPRODUCTION: Maturity, oocyte dynamics and fecundity of the roundnose grenadier from the...
J Markofsky,A Perlmutter 摘要: Aging was studied in the male, annual Cyprinodont fish, from East Africa, Nothobranchius guentheri. Median life-span of the population was 14 months at 21–25°. It was observed that there was variability in the onset of sexual maturity. When the population ...
Age at sexual maturity among male polar bears ( Ursus maritimus ) and timing of the mating season were studied by microscopic and macroscopic analysis of the reproductive organs from 165 male and 92 female Greenland polar bears. Males became sexually mature in the spring following their fifth bir...
The oldest female of the troop has remained sexually active. The attainment of sexual maturity by adulthood can be viewed as a learned process leading to efficiency and prowess, followed in old age by sexual involution. 展开 关键词:sexual behavior age Macaca fuscata primates monkeys ...
Age determination, validation, growth and minimum size of sexual maturity of the Greenland smooth cockle (Serripes groenlandicus, Bruguiere, 1789) in Easte... The Greenland smoothcockle () has a circumpolar distribution in the northern hemisphere. Despite such a wide range and potential commerci...
These results were replicated in an independent cohort (N = 303). When interpreted in the context of neural maturation, we conclude that neural function becomes more variable with maturity, at least in during the passive viewing of real-world stimuli. 展开 被引量: 1 年份: 2017 ...
While males are expected to increase reproductive effort with increasing age under sexual selection theory, female reproductive effort should rather decrease after maturity, due to waning selection pressure at older ages. Sex differences in reproductive trade‐offs and in the external mortality hazards ...
Chemical and technological analysis indicated that muscular maturity in Pectoralis major was reached at 11 weeks of age, but, at this age, breast lipid content is high. Moreover, after 10 weeks of age, food costs rapidly increased. 7. Lastly, sexual dimorphism for body weight is minor. In ...
There was also a close relationship between Tanner rankings of sexual maturity and both bone age and body mass index (weight/height2). Socioeconomic status was not related to sexual development, but there were significant racial and geographic differences in the age of development of secondary ...