Showing posts with label embryos. Show all posts
Showing posts with label embryos. Show all posts

Baby Turtles Communicate So They Hatch Together

Baby turtles hatch all at the same time. This is no accident: they communicate with each other while they are still buried under the ground. Some eggs are deep down where it is cooler. Others are near the surface where the sun heats the eggs up. As hatching gets closer those further down speed up their development while those higher up slow down.

University of Western Sydney researcher Ricky-John Spencer randomly collected turtle eggs then put them into two groups. One group was incubated at 25 degree Centigrade, the other group are 30 degrees. They were then all brought together and kept at the same temperature: they all hatched at the same time.

Jessica McGlashan took a closer look. She brought a female turtle into the lab and collected the eggs the turtle laid. One half of the eggs were put into the incubator at 30 degrees, While the other half received 26 degree incubation. Some eggs from both temperatures were then put into one group in the incubator at the higher temperature and those who had been initially incubated at 26 degrees were tested. They did indeed develop faster.

A group eggs was kept at 26 degrees throughout. As the days went by the faster developing embryos who were now at 30 degrees exhaled more carbon dioxide and their heart rates were faster than the embryos kept at 26 degrees.

Baby turtle don't actually communicate verbally, but they can "hear" each others heart beat, or rather feel the vibration of heart beats because the eggs are touching. They could even be measuring the carbon dioxide level.
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Biology

Weird Findings About IVF Babies

There has been a weird finding in research done on IVF children - they are taller than average. Work done in New Zealand has found that by six years of age children conceived by IVF are taller. This occurred when fresh embryos were used, but not with frozen embryos. The higher quality of fresh embryos was the apparent reason for this.

No benefits nor disadvantages were seen in children born using frozen embryos than children conceived normally. The real issue is - Are fresh embryos really of higher quality? Donors giving frozen embryos are just as selective.

About one in thirty children are now conceived with IVF. It is girls who are notably taller. Another "weird" outcome is that mainly boys will be conceived if the embryos are left out in a dish for five days before implantation into the uterus.
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