For tumors affecting the bottom half of the bile duct, the cancer is removed with a Whipple operation. For tumors in the top half of the bile duct, surgical treatment often requires removal of the tumor together with a liver resection (removal) in an attempt to provide a surgical cure.
How long for plastic water bottle to decompose? An average time for a plastic bottle to biodegrade fully is approximately 450-1000 years. However, there are many different kinds of plastic in the world, most commonly the haâ¦rd and reusable ones, which take a longer time, and the soft and non-reusable ones, which take a shorter time.
Now that you know the factors involved in the photo degradation process, you might be wondering how long does it take plastic to decompose under the optimal condition. In 2008, a young scientist named Daniel Burd, then a junior at Waterloo, Ontario High School degraded a common polyethylene grocery bag in three months.