English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The transition from morula to blastocyst is accompanied by an increase in metabolic activity (see Brinster, 1973). In lactating rats and mice or under certain experimental conditions, i.e. after ovariectomy in early pregnancy, blastocysts do not implant and exhibit a state of dormancy during which mitotic activity is absent (Baevsky, 1963), the ability to synthesize DNA, RNA and protein is almost non-existent (Weitlauf & Greenwald, 1965; Prasad, Dass & Mohla, 1968; Gulyas & Daniel, 1969) and energy metabolism is markedly lower (Menke & McLaren, 1970). For activation and implantation of such 'dormant' blastocysts to occur in utero, it is obligatory for the uterus to be under the influence of both ovarian hormones (Psychoyos, 1973). However, 'dormant' blastocysts transferred to extrauterine sites recover their mitotic activity, whereas those left in the uterus remain depressed (Kirby, 1967; Psychoyos, 1967), and after culture for some hours uridine uptake (Psychoyos & Bitton-Casimiri, 1969) and amino acid incorporation (Weitlauf, 1974), initially low, increase. In order to study the synthetic processes of blastocysts removed from the uterine environment,

Uptake and incorporation of [3H]uridine by normal or diapausing rat blastocysts after various periods of culture