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Gestation in Biological News

Repeat C-section before 39 weeks raises risk of neonatal illness

... them at term but before completing 39 weeks gestation are up to two times more likely to have a baby ... small studies that infants born before 39 weeks' gestation are at increased risk for respiratory distress. ... elective cesarean of a viable infant at 37 weeks gestation or later in the absence of labor or other ...

Women's health-related scientific findings presented by University of Pittsburgh researchers

... babies were born earliest less than 34 weeks gestation had the highest concentrations, Janet M. Catov, ... on 47 women who had delivered prior to 37 weeks gestation with data on 104 women with term births, at or ... of preterm birth compared to those with normal gestation births, said Dr. Catov, adding that results were ...

September 2008 Biology of Reproduction highlights

... novel approach in which pregnant female mice were exposed before or during gestation to filtered or nonfiltered air in exposure chambers placed in the garden ... Pregnant mice exposed to urban air pollution either before or during gestation produced fetuses of smaller weights compared to those provided filtered ...

Exercise during pregnancy leads to a healthier heart in moms- and babies-to-be

... of the fetal activity or the gestational age. at each stage of gestation the differences between the fetal heart rates of the two groups were ... of short- and long-term heart variability at 28, 32 and 36 weeks of gestation in exercise-exposed vs. non-exercise-exposed fetuses were statistically ...

Bacterial infections in premature babies more common than previously realized

... fetal infection. 23% of neonates born between 23 and 32 weeks of gestation have positive umbilical blood cultures for two genital mycoplasmas ... 457 consecutive singleton deliveries of infants born at 23-32 weeks gestation from 1996 to 2001. This study focuses on a subset of 351 women/infant ...

Researchers find evidence linking stress caused by the Sept. 11 disaster with low birth weights

... the associations we are seeing with birth weight likely reflect shorter gestation and earlier births, rather than a reduction in foetal growth, explained ... the babies would have been in either their first or second trimester of gestation or being conceived. In NYC there was a 36% increased risk of babies ...

Stem cell research: From molecular physiology to therapeutic applications

... adipogenic and endothelial lineages, but also hepatocyte-like cells, and neural and erythroid cells. They remained in some tissues and organs during gestation and could give rise to different kinds of pluripotent stem cells and thus could potentially contribute to self-repair and self-renewal of tissues and ...

Brain malformations significantly associated with preterm birth, Wake Forest research shows

... defects, the mean gestational age was 36.6 weeks, whereas the data showed a mean gestational age of 39.9 weeks for infants with no defects and a gestation of 38.1 weeks for infants with defects of any kind. "Preterm" birth is defined as 20 to 36 weeks gestation, while "term" birth is defined as 37 to 41 ...

Pre-pregnancy depressed mood may heighten risk for premature birth

... health over time among black women. For this study, premature birth referred to any child born after less than 37 weeks of gestation. Normal gestation ranges from 38 to 42 weeks. Data for the study was drawn from a larger longitudinal investigation looking at the risks for cardiovascular disease ...

Report updates guidelines on how much weight women should gain during pregnancy

... pregnancy weight change. Noting that entering pregnancy with a normal body mass index (BMI) as well as gaining within the recommended levels during gestation are the best ways to minimize the risks, the report calls for increased diet and exercise counseling and programs to help women attain a normal BMI. ...

Pregnancy hormone predicts postpartum depression

... professor, and colleagues found that women whose levels of corticotrophin-releasing hormone started to increase more rapidly around 25 weeks of gestation had a higher incidence of postpartum depression. Normally secreted in very small amounts by the hypothalamus, this hormone regulates the body's ...

New technology aims to reduce maternal and neonatal deaths

... given that there are no known cures for preeclampsia, and the only treatment available to date is to deliver the baby and placenta at any stage of gestation at which the disease is diagnosed. The work has been supported by grants from the Canadian Institutes of Health Research, Western and the Children's ...

Endangered sawfish focus of national collection and recovery efforts

... reproductive potential, Burgess said. Although the sawfish has a long life span of 30 years or more, it is a live-bearer. As such, it has a prolonged gestation period and produces very few young, he said. ...

Dolphin population stunted by fishing activities, Scripps/NOAA study finds

... rates and/or birth rates. This could be caused when fishing operations separate mothers from their suckling calves, interfere with the conception or gestation of calves or a combination of the two. "The link between fishing activity and reproductive output indicates that the fishery has population-level ...

Stanford researchers: Global warming is killing frogs and salamanders in Yellowstone Park

... The frogs and salamanders lay eggs that have a gelatinous outer layerbasically "jelly eggs," McMenamin saysthat leaves them completely unsuitable for gestation on land. If the ponds dry up, so do the eggs. "If there isn't any water, then the animals simply don't breed," she said. Biology Associate ...

Depression during pregnancy can double risk of preterm delivery

... with less severe depressive symptoms had a 60 percent higher risk of preterm delivery -- defined as delivery at less than 37 completed weeks of gestation -- compared with women without significant depressive symptoms, and the women with severe depressive symptoms had more than twice the risk. ...

Racial disparities in cardiovascular health linked to birth weight, slavery

... when very severe, has been shown to have an intergenerational effect," says Jasienska. Dutch women exposed to famine as fetuses in mid- and late gestation have also been shown to have reduced birth weights, and the effect was detectable years later because birth weight of their children was also ....

Clue to genetic cause of fatal birth defect

... special "knockout" mice that were missing the gene for the enzyme called HSD17b7, UIC researchers found that such mice died on the tenth day of gestation with the severe lack of brain development that characterizes the human birth defect. The failure of the mice to develop, as well as the extreme ...

New study shows compounds from soy affect brain and reproductive development

... ovulation. "That part of the brain," Patisaul says, "is organized by hormones during development which is the neonatal stage for rats and during gestation for humans." Patisaul says the new study shows that the female brain is "critically sensitive" to genistein and equol during this crucial stage of ...

National Zoo giant panda pregnancy update

... look for evidence of a fetus. So far, they have not seen evidence of one. Because panda fetuses do not start developing until the last weeks of a gestation period, Zoo veterinarians say they do not yet expect to see a fetus. They stress, however, that it is still too early to determine if Mei Xiang is ...

Do chemicals in the environment affect fertility?

... stored mostly in fat tissue. Though these chemicals may not be directly harmful to these individuals, if they are passed on for example, through gestation in the womb or through the food chain they might have consequences for human health. One of the concerns of bioaccumulation is that when the fat ...

A new gene trigger for pregnancy disorder identified

... Next the investigators looked at genetically engineered COMT deficient mice; as predicted, the animals failed to produce 2-ME. At 14 weeks gestation the presumable equivalent of the beginning of the third trimester in human pregnancy the animals developed protein leak in the urine, high blood ...

Biology of Reproduction highlights

... Now, on p. 883 of the May 2008 issue, Su et al. report results of a study designed to establish number of maternal cells present, effects of stage of gestation and preferential homing of maternal cells to fetal organs of mice. Such basic information is of interest because maternal cells are present in ...

Breathless babies: Preemies' lung function shows prolonged impairment

... of lung function development. To determine if that was the case, Dr. Jones and colleagues recruited 26 preterm infants born between 30 and 34 weeks gestation and compared their lung development and function to that of full term infants at about 10 weeks of age, then again at an average age of 15 months. ...

Study identifies warning signs of pregnancy danger

... see if there was a trigger for this, she said. In her study, Black found that stress is higher in women with worsening or severe preeclampsia and gestation hypertension. She said nurses can help their patients reduce stress levels by identifying social supports within the family and in the community, or ...

Womb needed for proper brain development

... said that an ultrasound study of the brains of babies born around 26 weeks gestation showed that certain aspects of brain development were very compromised ... were compared to the brain ultrasounds taken in utero at about 26 weeks gestation and at birth in other studies to a matched group of 38 full-term infants. ...

Size matters: Preventing large mammal extinction

... have the additional pressure of biological disadvantages such as long gestation period and late weaning age to contend with, significantly increasing ... low population density, slow life history, late weaning age and extended gestation in mammals above a certain size means they are evolutionarily ...

Researchers Find New Technique To Identify Fetal Genetic Material From Amniotic Fluid

... of cell-free amniotic fluid from pregnant women between 20 and 32 weeks' gestation and who had certain conditions that required procedures to reduce an ... in this study was 6 pooled amniotic fluid samples from women at 17 weeks' gestation who were undergoing amniocentesis (removal of amniotic fluid to test for ...

100 percent of pregnant women have at least one kind of pesticide in their placenta

... be assimilated by our body, and are accumulated in the fatty parts of our tissues. This is especially worrying for pregnant women. During the gestation period, all the contaminants accumulated in the organism have direct access to the microenvironment where the embryo/foetus develops. The doctoral ...

Tumor-suppressor gene is critical for placenta development

... with the uterus. These embryos died about 15 days after fertilization, a time at which placenta function becomes critical for survival (the gestation period for mice is 19 days). Interestingly, the researchers also produced some mice in which the Rb gene was present in the placenta stem cells ...

Prenatal cocaine's lasting cellular effects

... Center, established such a model in rabbits. They found that exposure to low levels of intravenous cocaine during a very short window of time during gestation -- equivalent to the late first trimester and early second trimester in humans -- caused specific alterations in brain circuits that use the ...

US infant mortality rate fails to improve

... grams or 5.5 pounds) increased 9 percent between 1995 and 2003, according to an analyses by the March of Dimes. Babies born at less than 28 weeks gestation accounted for less than 1 percent (0.7 percent) all live births but nearly half (46.4 percent) of all U.S. infant deaths in 2003. Also, infants ...

Successful transplantation from pig embryos to mice

... embryos into mice lacking proper immune systems, they determined that the best time frame for pancreatic tissue was about a third of the way through gestation (from 42 to 56 days). In the new study, Reisner's team wanted to see if such tissues could function in the body. They first implanted embryonic ...

Researchers identify human DNA on the fast track

... e-mailed Salama with exciting news. He had discovered that RNA including the HAR1 region is first produced between the 7th and 9th weeks of gestation in human embryos. Furthermore, the RNA was produced by a Cajal-Retzius neuron, a particular type of cell that plays a critical role in creating the ...

How ancient whales lost their legs, got sleek and conquered the oceans

... change occurred to inactivate a gene essential for limb development. This gene - called Sonic hedgehog - functions during the first quarter of gestation in the embryonic period of the animals' development, before the fetal period. In all limbed vertebrates, Sonic hedgehog is required for normal ...

Born with a love of speech

... American Association for the Advancement of Science in St. Louis, February 17th. Neural and cochlear development is such that at about six months gestation the fetus begin to hear a range of frequencies. Thus, there's the possibility that newborns preferentially listen to speech because they're used to ...

Precise Timing Enabled Pig-to-rat Transplants To Cure Diabetes

... appears to be relatively little difference between pancreatic primordia from 28-day-old and 35-day-old pig embryos. "To put this in perspective, pig gestation is about 120 days, and it takes every bit of that time for the pancreas to fully develop," Hammerman explains. "There is no pancreas before embryonic ...

Researchers make surprise discovery that some neurons can transmit three signals at once

... be enhanced or inhibited. The first week after birth marks a critical phase in the developing rat brain, a time period comparable to three months gestation in a human, when neurons are meticulously organizing and self-selecting to assemble into specific brain structures and neuronal networks. It has long ...
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