September 2000, Amsterdam - Projects - The Netherlands

Sarah Broadbent (16)
School: European School Bergen
Hobbies: travel, photography, skiing, reading, computers, bible study, sports
Career intention: biochemist

Sofie Jacobsen (18)
School: European School Bergen
Hobbies: badminton, tennis, cross country running, travelling, history, politics
Career intention: politician

Recycling drinks cartons
Our research looks at the possible methods of recycling the 85 billion drinks cartons used annually. We started off by composting non-aseptic cartons, which are made up of layers of cardboard sandwiched between polythene. We investigated three methods of removing the polythene that happened to be successful in varying degrees. The remaining cardboard was composted on a large scale. Aseptic cartons contain aluminium, which we dissolved by refluxing shredded cartons with both acid and alkali. The alkali produced the best results.
Later we combined this method with the method for recycling non-aseptic cartons. We think we have found several useful techniques for recycling the cartons and recovering the aluminium, polythene and cardboard. Further research is being done.

Paul Bakker (18)
School: Comenius College
Hobbies: astronomy, soccer, Tolkien
Career intention: astronomer

Jean-Pierre Nelk (18)
School: Comenius College
Hobbies: chess, Tennis
Career intention: Life scientist

Annet Nijmeijer (18)
School: Comenius College
Hobbies: Rollerblading, Surfing, sitting in the sun, swimming, reading and tv
Career intention: Journalist

The non-specific human defensive system
We have done research into the effect of gastric juices and fever on bacteria as we think (and many with us..) that it is important that they work properly!
For our research we worked with two hot water basins (one with a temperature of 37 and the other of 40 degrees Celsius). Using hydrochloric acid and pepsin (an enzyme found in the stomach), we tried to imitate the conditions in the stomach. The hot water basin with a temperature of 40 degrees was used to simulate fever. The bacteria in a test tube were placed inside the basins and after 28 hours put on a culture medium. This way we could see (after another 24 hours) in which test tube the bacteria had survived. As some were killed and some survived, some conclusions could be drawn on the effects on bacteria.