Blocking Juvenile Hormone (JH) production, as occurs in most cases of adult diapause, results not only in the arrest of egg maturation but also induces physiological adaptations to prepare for over-wintering [ 6].
Scientists have long been amazed by the egg maturation process.
In these species, subjective RV effects operate via egg maturation state, whereas egg load effects have only been found in Goniozus when other asymmetries were absent [ 7].
Three-day-old female E. nassaui have reached their maximum egg complement so are not limited by egg maturation (Murray 2010).
Bob's initial work in this field focused on the possibility that birth defects might arise through errors in chromosomal segregation during egg maturation or fertilisation, and he worked with Ruth Fowler, whom he married in 1954, to demonstrate that eggs could be induced to mature chromosomally according to a predictable schedule by hormone treatment.
More specifically, estrogens induce an increase in hepatic cholesterol synthesis and uptake by activating HMGCoA reductase and LDLR gene transcription, allowing the lipidation of vitellogenin, which is involved in egg maturation [ 19].
"Oestrogen," explains Whitehead, "is a byproduct of egg maturation".
The ability of some eggs to develop a polyspermy-preventing reaction depends on a molecular rearrangement of the egg surface that occurs during egg maturation (oogenesis).
Questions of human egg maturation and its anomalies, and achieving human fertilisation in vitro, came to dominate his interests during his early days in Cambridge.
In some species egg maturation is delayed several months after the final molt, and the females do not lay the eggs until they have matured.
One is interfering with the final steps of egg maturation, so that any eggs released are either immature or past their prime.
