Embryo abortion

After getting pregnant by in vitro fertilization (IVF), pregnancy loss is one factor that prevents the baby from being born. An estimated 80% of pregnancy loss occurs in the first trimester, which is higher than in the natural pregnancy. The reason is said to be that the age of women receiving fertility treatment is often higher, leading to ovarian reserve, and decreased oocyte quantity and quality.

7p vimclaren 20-10-2022 6 2   Download

Peanut embryo development is a complex process involving a series of gene regulatory pathways and is easily affected by various elements in the soil. Calcium deficiency in the soil induces early embryo abortion in peanut, which provides an opportunity to determine the mechanism underlying this important event. MicroRNA (miRNA)-guided target gene regulation is vital to a wide variety of biological processes.

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Embryo rescue is an in vitro technique that has been used to save the hybrid products of fertilization when they might otherwise degenerate. Embryo culture applied to practical problems is a tissue culture technique that has proven to be of greatest value to breeders. One of the main uses of this technique is to produce interspecific and intergeneric hybrids. Post-zygotic barriers such as endosperm abortion and embryo degeneration leading to low fertility have been overcome through the use of embryo culture and several hybrids have been developed in horticultural crops.

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Ectopic pregnancy is defined as a pregnancy in which the implantation of the embryo occurs out- side the uterine cavity, most frequently in one of the two fallopian tubes or, more rarely, in the abdo-minal cavity or the cervix .

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This leaves nearly 60% of birth defects for which the etiology is unknown but in which environmental exposure might play a role. For every 3,000,000 U.S. births annually, at least 600,000 embryos or fetuses are aborted spontaneously before the 20th week, and some 24,000 fetuses die before birth. Of live births, nearly 8% are premature, and approximately 7% have low birthweight. Another 3–7% possess some type of malformation. Although the overall incidence of infertility remained stable between 1965 and 1982, infertility among...

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Reproductive rights advocates have been put in a particularly challenging position because public debate about ART has been dominated by abortion politics. The Religious Right has succeeded in centralizing the discussion on the moral status of the embryo, obscuring a broader set of issues. Put in a defensive position, the reproductive rights movement has, until recently, not had the opportunity to grapple internally with the complexities of ART use, and has tended to fall back on traditional models of individual autonomy and choice. With increasing numbers of U.S.

17p le_minh_nha 25-12-2012 59 8   Download