Tag: "embryo" at biology news

Scientists prove that disputed Korean stem cell line comes from an unfertilized egg and not cloning

...ic analysis can help distinguish the type of human embryo that stem cells come from. The research, to be published online August 2nd by the journal Cell Stem Cell, published by Cell Press, also provides an intriguing new insight into the largest scandal in the history of human stem cell research. Differen...

Discredited Korean embryonic stem cells' true origins revealed

...ived by parthenogenesis, a process that creates an embryo containing genetic material only from the donor egg. "We know now that the Koreans' first supposed nuclear transfer-derived stem cell line was actually derived from the woman's egg alone," Daley says. The Koreans' 2004 paper, published in Scienc...

Rare example of Darwinism seen in action

...a placenta. Because of the placenta, a developing embryo remains longer inside the mother (in marsupials, early development of the newborn occurs in the mothers external pouch). Evidence to support the conflict over nutrients theory has been found in placental mammals. But the new study is the first to l...

Fruit fly research may 'clean up' conventional impressions of biology

... the first steps of blueprint formation in the fly embryo literally live and in color. The first of two pape...s studying embryos: How precisely can cells in the embryo read the blueprint" So precisely, the paper suggests, that a precious few molecules signaling a c...

Study provides new data about the laws governing embryo development in organisms

...h aimed at understanding the mechanisms underlying embryo development has taken a step forward thanks to collaborative work between biologists specialized in the study of the fruit fly (Drosophila melanogaster) and scientists specialized in the design of mathematical models that simulate the functioning of ...

Complex ART procedures more likely to lead to umbilical cord abnormality

... an egg, it was 10.4%. The scientists think that embryo implantation may be different after assisted reproduction. When an embryo is transferred to an area with poorer nourishment conditions, the placenta may migrate to more favou...

Germany's embryo protection law is 'killing embryos rather than protecting them'

Lyon, France: Instead of preserving life, Germanys embryo protection law has had the unintended consequence ...hat this situation does not continue. The German embryo protection law, passed in 1991, stipulates that no more than three embryos can be created per cycle ...

Pre-implantation genetic screening reduces both ongoing pregnancy and live birth rates in over 35s

...s possible that the biopsy of a cell from an early embryo on day 3 after conception hampers the potential of an embryo to successfully implant, said Mr. Mastenbroek, though the effect of biopsy alone on pregnancy rates ...

Risk-taking in infertility treatment correlates with women's negative moods

...ng relationship between negative mood and multiple embryo transfer, a scientist told the 23rd annual confere...uires the transfer of fewer, and ideally only one, embryo (single embryo transfer, or SET). However, many women resist SET because they either favour a mult...

Cloning the male genome may help infertile men

...ility to fertilise and to participate in full-term embryo development, we would be able to enhance the numbe...owed to develop into blastocysts, where each early embryo contains between 70 and 100 cells. 64 blastocysts were transferred to 6 foster-mother mice, and so...

First baby is born after oocytes were matured in the lab and frozen

...uccessfully and result in a viable pregnancy after embryo transfer. We have demonstrated for the first tim...bryos were transferred to the women. More than one embryo was transferred to each patient because IVM is known to have lower rates of implantation. The result...

Personalized approach to ovarian stimulation achieves high ART pregnancy rates

...men, and 80.9% of the women subsequently underwent embryo transfer. Pregnancies per cycle were 31.3%, 31.1%, 35.3%, 50% and 20% per starting dose of 75IU, 112.5IU, 150IU, 187.5IU and 225IU respectively, with an average pregnancy rate of 34.2%. There were two cases of severe OHSS associated with pregnancy. O...

Time-lapse recordings reveal why IVF embryos are more likely to develop into twins

... many more were born after IVF, even when only one embryo had been transferred to the mother (approximately ...t and is formed on about day four or five when the embryo forms tight junctions between the cells around its periphery. These outer cells (the trophectoderm) ...

Marine worm opens new window on early cell development

... to specify cell fate throughout development in an embryo that, given the invariance of the embryonic cell lineage and the prevalence of asymmetric cell divisions, has been viewed as a classic example of mosaic development, Schneider and Bowerman wrote in their conclusion. There are some 10,000 species of...

Loss of cell's 'antenna' linked to cancer's development

...ight, smell and motion detection and in helping an embryo develop into a normal baby. Defects in cilia can produce a range of disorders, including kidney cysts, infertility, respiratory problems, reversal of organs (for example, heart on the right) and a predisposition to obesity, diabetes and high blood p...

Researchers find gene that spurs development of the epididymis

...ture called the Wolffian duct. When the male mouse embryo is about 13 days old, the Wolffian duct begins to grow and differentiate into the plumbing system connecting testes and vas deferens. This normally occurs in males shortly after testosterone levels begin their increase. But in the embryos Tomaszewski...

A faster way to recover from chemotherapy and marrow transplant

...to a well, 48 wells to a plate then checking each embryo 24 hours later to monitor its development and count its blood stem cells. The screen identified 82 chemicals that markedly increased or decreased gene activity. Of these, 10 turned out to affect the prostaglandin pathway: five increased the formati...

Changes in chromosomal constitution of preimplantation embryos suggest caution in genetic screening

...ept that the entire chromosomal constitution of an embryo can be represented by a single cell, which is remo...normal, there is a 90% chance that the rest of the embryo is also abnormal or mosaic, where two or more cells with different chromosomal constitution exist in...

Children born after PGD as healthy as those born after conventional IVF treatment

Nice, France: Children born after embryo biopsy for preimplantation genetic diagnosis (PGD)...iving questionnaires to patients on the day of the embryo transfer. Additional questionnaires were sent during pregnancy, at delivery, and later on to the p...

JCI table of contents: June 14, 2007

... from Vanderbilt University first established that embryo implantation in the uterus in female Fkbp52-/- mic...led progesterone receptor signaling sufficient for embryo implantation in the uterus in female CD1 Fkbp52-/- mice, these levels were not sufficient to maintai...

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(Date:7/27/2014)... vitro study has revealed that nicotine and cotinine, a ... by a certain carcinogen in smoke. , The carcinogen ... tobacco leaves and ultimately ends up in the tobacco ... and liver, where it is activated by a variety ... mice has revealed that nicotine can partially interfere with ...
(Date:7/27/2014)... asteroid strike that wiped them out if it had ... say. , A fresh study using up-to-date fossil records ... a new narrative of the prehistoric creatures, demise, some ... the few million years before a 10km-wide asteroid struck ... This included extensive volcanic activity, changing sea levels and ...
(Date:7/27/2014)... to date, researchers from the U.K. provide national, regional, ... virus (HCV). Findings published in Hepatology, a journal of ... indicate that genotype 1 is the most prevalent worldwide, ... reside in East Asia. Genotype 3, at just over ... by genotypes 2, 4, 6, and 5. , ...
Breaking Biology News(10 mins):Nicotine found to inhibit DNA-strand break caused by a certain carcinogen in smoke 2Dinosaurs fell victim to perfect storm of events, study shows 2Hepatitis C virus genotype 1 is most prevalent worldwide 2
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