The embryos were then transferred to recipient women. They had pregnancies when the recipient's cycle was from 4 days in front of to 3 days behind the donor's uterus at ovulation. This suggests a window of implantation of up to 7 days. Navot et al, in 1991 reported on donor embryo transfers done with 2-3 day old embryos on recipient cycle days 15-20 (artificial cycles controlled with meds). Pregnancies resulted from transfers on all days. This suggests a window of at least 6 days.
Polymers. The word polymer literally means many parts.. A polymeric solid material may be considered to be one that contains many chemically bonded parts or units which themselves are bonded together to form a solid.Two industrially important polymeric materials are plastics and elastomers.he word polymer literally means many parts.. A polymeric solid material may be considered to be one that contains many chemically bonded parts or units which themselves are bonded together to form a solid.
A polymer is a large molecule, or macromolecule, composed of many repeated subunits. Because of their broad range of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function. Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as mon