Maximum DNA synthesis during the midproliferative phase of the cycle (i.e. cycle days 8â10) correlates with the maximum number of mitoses in both the stromal and epithelial endometrial cellular elements, as well as with the midproliferative peak of plasma estradiol and nuclear estradiol receptors.
Some defining characteristics of angiosperms include flowers, carpels, and the presence of endosperm, a nutritive substance found in seeds, produced via a second fertilization event. However, some current studies suggest that endosperm is not unique to angiosperms.
Angiospermae. (also Magnoliophyta or Anthophyta), a division of seed plants. Angiosperms are characterized by the presence of a true flower, which differs from the strobiles of gymnosperms in that the megasporophyll is converted into a carpel.The carpel concresces at the edges to form a closed cavity in which the ovules develop.Double fertilization occurs in all angiosperms.ngiosperms are characterized by the presence of a true flower, which differs from the strobiles of gymnosperms in that the megasporophyll is converted into a carpel. The carpel concresces at the edges to form a closed cavity in which the ovules develop. Double fertilization occurs in all angiosperms.