The pathogenesis of ectopic gastric mucosa is a matter of debate between a congenital-embryological-and an acquired origin-consecutive to a gastroesophageal reflux (GER) like Barrett's esophagus -, the most commonly accepted theory being that these areas are embryological remnants.
Standard size latex filled helium balloons stay afloat for approx 8 - 12 hours, metallic helium filled balloons float for 2-5 days. I have found that a 36 latex helium filled balloon can stay afloat for a number of days due to the thickness of the balloon and the massive quantity of helium.
Experts caution that many of the earth's helium reserves could be depleted within the next 40 to 100 years. Congress ultimately voted to renew a 1996 law authorizing helium sales that would have expired this month. The medical field is one of the biggest users of liquid helium, for sure, Dr. Wicklund said. And thanks to the actions of Congress, the MRI machines can keep scanning. President Obama signed the Helium Stewardship Act of 2013 into law Oct. 2.