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.
Intro to Polymers. The term polymer is commonly used today in the plastics and composites industry, and it is often used to imply the meaning of plastic or resin. In actuality, the term polymer means much more. A polymer is chemical compound where molecules are bonded together in long repeating chains.These materials, polymers, have unique properties and can be tailored depending on their intended purpose. Polymers are both man made and are naturally occurring.For example, rubber is a natural polymeric material that is extremely useful and has been used by man for thousands of years. Rubber has excellent elastic properties, and this is a result of the molecular polymer chain created by mother nature.Both man made and natural polymers can exhibit elastic properties, however, polymers can exhibit a wide range of additional useful properties.Depending on the desired use, polymers can be finely tuned to leverage the advantageous property. These properties include: 1  Reflective.ntro to Polymers. The term polymer is commonly used today in the plastics and composites industry, and it is often used to imply the meaning of plastic or resin. In actuality, the term polymer means much more. A polymer is chemical compound where molecules are bonded together in long repeating chains.