Sentence examples for delivery of sperm from inspiring English sources
Whereas copulation and the delivery of sperm into the female's reproductive tract can occur weeks or months before the eggs are ovulated, fertilization and egg deposition typically appear to occur within hours to days of ovulation.
They play a crucial role in the delivery of sperm cells through the stylar tissues of the flower and into the embryo sac, where the sperm cells are released to fuse with the egg cell and the central cell to give rise to the embryo and the endosperm.
Hybrid micromotors, such as spermbots, offer an alternative approach to tubular micromotors and at the same time open up a new field of potential impact in reproduction research and in the fight against infertility by targeted delivery of sperm cells to the fertilization site.
The absence of callose in pollen tubes did not eliminate pollen germination, polarized tube growth, pollen tube guidance to the ovules, or the delivery of sperm cells.
The pollen tube cytoplasm could be injected between the egg cell and one synergid cell, creating a channel for the delivery of sperm cells between the plasma membranes of the synergid cell and the egg cell.
Delivery of sexed sperm to the site of fertilization varies with species.
The chromatin of the VN is less condensed, compared with SC, and does not contribute DNA directly to the progeny, but functions to control delivery of the sperm (McCormick 1993).
Following pollination, the pollen grain lands on the pistil and extends a pollen tube that allows the delivery of the two sperm cells into the female gametophyte, and then gives rise to the diploid zygote to begin the sporophytic generation [ 4].
In these circumstances, a male's chances of paternity require the delivery of large volumes of sperm to flood out the competition, and infants are conceived after competition in the reproductive tract between sperm from rival males.
They have been used for the delivery of genes and sperms to target cells including ova [2 5].
The difficulties in imaging the double-fertilization process prevented the identification of the mode of sperm cell delivery.
