The protein content of fluids isolated from the lumen of the uterus of the ferret was correlated with growth of the pre-implantation embryo. Similar observations were made with mink for comparative purposes. Tt is concluded that in the ferret: Protein content rises coincidentally with blastocyst expansion, becoming especially high when the embryo is implanting. The proteins present early in the...

During embryonic development of Artemia sinica, environmental stresses induce the embryo diapause phenomenon, required to resist apoptosis and regulate cell cycle activity. The small ubiquitin-related modifier-1 (SUMO), a reversible post-translational protein modifier, plays an important role in embryo development. SUMO regulates multiple cellular processes, including development and other biol...

Diapause is an adaptive trait that delays development or reproduction under unfavourable circumstances. The northern corn rootworm,Diabrotica barberi Smith & Lawrence, an important maize, Zea mays L., pest in the Diabroticite species complex, overwinters in diapause during the egg stage. Some NCR populations are adapted to crop rotation by expressing an extended diapause (ED) trait that delays ...

BACKGROUND When a competent blastocyst stage embryo finds itself in an unreceptive uterus, it delays development. In around one hundred species representing various orders, this delay is known to be reversible, but this phenomenon - termed embryonic diapause (ED) - is not considered a general characteristic of all mammals. PRESENTATION OF THE HYPOTHESIS Recently, however, we demonstrated that...

The marsupial tammar wallaby has the longest period of embryonic diapause of any mammal. Reproduction in the tammar is seasonal, regulated by photoperiod and also lactation. Reactivation is triggered by falling daylength after the austral summer solstice in December. Young are born late January and commence a 9-10-month lactation. Females mate immediately after birth. The resulting conceptus de...

Effects of long day and short day treatments during the embryonic and larval stages on induction of pupal diapause were studied on a diapausing race of Sarcophaga peregrina. Two long day (15L 9D) cycles during 2 days before or after the larviposition completely stopped the induction of pupal diapause on larvae which grow in short day condition before and after the long day treatment. The sensit...

The effect of temperature on the voltinism of the silkworm, Bombyx rnori, was discovered by Watanabe (1918) over 45 years ago. This followed the rinding of the important role of photoperiod during the incubation period of silkworm eggs (Kogure, 1933). In brief, whether diapause or non-diapause eggs are laid depends on temperature and light experienced by the mother during her embryonic life. In...