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.
I am a software engineer, but also have many years of study in fields of neuroscience, molecular biology, and theoretical physics. A gel is a substance this is mostly a liquid, but behaves as a solid due to cross-linking bonds (usually due to polymerization) that exists in the overall structure. To show the contrast, a solid is usually a substance held in some sort of crystalline form (be it due to ionic, covalent, or hydrogen bonds), which makes the overall structure rigid, so that it does not flow.