Sentences with phrase «earliest placental»

The earliest placental mammal fossils appear only a few hundred thousand years after the mass extinction, suggesting the event played a key role in diversification of the mammal group to which we belong.»

From measuring the number of character changes over time for each branch, they found the average rate of evolution for early placental mammals both before and after the dinosaur extinction event.

We plan on using it to study other large - scale evolutionary patterns such as how early placental mammals dispersed across the continents via land bridges that no longer exist today.»

Moreover, such large trees are very useful for future studies of large - scale evolutionary patterns, such as how early placental mammals dispersed across the continents via land bridges that no longer exist today.»

Not exact matches

Supports women experiencing symptoms of depression or anxiety after a traumatic birth experience, including early and late miscarriages, still birth, newborn illness, NICU, hospital transfer during planned homebirth, inadequate pain relief, unplanned medical intervention, birth plan not being honored, c - section, infant resuscitation, placental abruption, or general anesthesia during birth.

As early as the first trimester, doctors can take a sample of placental tissue (chorionic villus sampling, or CVS) to detect whether a baby has the genes that would lead to sickle cell anemia or sickle cell trait.

Again, a light flow may indicate the implantation bleeding and a heavier flow may indicate a placental problem with an early pregnancy or a problem like an early miscarriage or blighted ovum.

There is a theoretical risk that the jerking motions could lead to placental abruption later in pregnancy, and although riding a roller coaster in very early pregnancy is most likely not going to cause problems, no one really knows where the cut - off point lies for safe versus risky.

Early cord clamping carries the further disadvantage of depriving the baby of the oxygen - rich placental blood that Mother Nature provides to tide the baby over until breathing is well established.

It underscores the importance of folate not only in reducing the incidence of early embryonic defects, but also in the prevention of developmental delays and placental abnormalities that may increase susceptibility to other defects and to reproductive complications.

Evidence of placental abruption as a chronic process: Associations with vaginal bleeding early in pregnancy and placental lesions.

«If a woman is told to stay in bed due to vaginal bleeding, preterm labor, early cervical changes (incompetent cervix, effacement), high blood pressure or preeclampsia or placental abruption, masturbation would likely be unwise,» Blumenfeld says.

Placental abruption occurs when the placenta detaches from the uterine wall too early.

To figure out how chromosomes of placental mammals have changed over time, researchers need to know what those early eutherians started with.

The research team writes that the findings demonstrate that placental dysfunction due to CHD can be apparent as early as the second trimester of pregnancy using this imaging technology.

In pregnancies complicated by fetal congenital heart disease (CHD), global placental perfusion was significantly decreased and regional variation of placental perfusion significantly increased as pregnancies progressed, findings that point to non-invasive imaging providing an early warning of placental dysfunction.

If there were placental mammals in the Early Cretaceous of Australia, Krause says, it would «push back the record of placentals farther than we expected on any southern land mass and in many ways revolutionize our concept of early mammalian biogeography.&rEarly Cretaceous of Australia, Krause says, it would «push back the record of placentals farther than we expected on any southern land mass and in many ways revolutionize our concept of early mammalian biogeography.&rearly mammalian biogeography.»

Because so little is known about Gondwanan mammals, Krause is wary of dismissing Rich's interpretation «just because we don't expect, based on current knowledge of early mammalian evolution on Gondwana, to see a placental mammal in the Early Cretaceous of Australia.&rearly mammalian evolution on Gondwana, to see a placental mammal in the Early Cretaceous of Australia.&rEarly Cretaceous of Australia.»

Perhaps placentals arose earlier that expected — say, while the continents were still lumped together into the single supercontinent, Pangaea.

The researchers» conclusion that terrestrial placental mammals may have lived down under 110 million years earlier than expected, as reported in the November 21, 1997 issue of Science, could all but uproot the mammalian family tree.

«The case that terrestrial placentals had not reached Australia until 5 million years ago was so strong,» Rich recalls, «that the thought of them being in Australia this early never crossed my mind.»

«The earliest branches are in the Southern Hemisphere,» he says, «so that's where you'd start looking for the origin of placentals.

Still, she cautions that in allowing patients to start the drug as late as 20 weeks into pregnancy the protocol may not have been ideal for exploring whether the drug helps prevent preeclampsia; experts in placental development often suggest starting with a blood thinner as early as eight weeks, she says.

Through recent work by the same team at UCL, this issue was resolved by creating a new tree of life for placental mammals, including these early forms, which was described in a study published in Biological Reviews yesterday.

The new study controverts the early origin model, concluding that the placentals originated after the mass extinction event, with the first modern groups evolving two million to three million years later — after the breakup of the supercontinent Gondwana.

Some suggest that rabbit - or ungulate - like placental mammals existed early in the Cretaceous period, whereas other researchers push for a more recent origin, circa 65 million years ago — around the time when dinosaurs disappeared.

Conventional wisdom holds that the precursors of modern placental and marsupial mammals arose toward the end of the Jurassic in the Northern Hemisphere, based on the ages and locations of the earliest remains of these shrewlike creatures, which are characterized by so - called tribosphenic molars.

They included cloning (somatic cell nuclear transfer, accomplished in many placental mammals), stem cell gametogenesis (has been done in mice), direct engineering of early stage embryos (has been done in several mammals), embryonic stem cell editing, and primordial germ cell (PGC) editing.

She has been involved in the identification of early biomarkers of placental damage in cohorts of patients at high risk of pregnancy complications, with specific focus on the role of autoimmunity and of vascular inflammation.

Women who had a positive thyroid test were more than twice as likely to experience placental abruption, a complication in which the placenta separates from the uterus too early during birth.

A mare's conditions can help early identification and intervention: illness during gestation, early lactation, placentitis, premature placental separation, dystocia