One of the ways you can tell if you have one of the rare PEZ dispensers is to look and see if there are feet. At the bottom of your dispenser, is there a part that helps it stand up right? If not, it was probably made before 1987. Rare dispensers that are older like that are worth more.ne of the ways you can tell if you have one of the rare PEZ dispensers is to look and see if there are feet. At the bottom of your dispenser, is there a part that helps it stand up right? If not, it was probably made before 1987. Rare dispensers that are older like that are worth more.
A tween is a child between the ages of 9 and 12. A tween is no longer a little child, but not quite a teenager. They are in between the two age groups and their behavior and emotions reflect that. The word 'tween' has become very popular in recent years.
TWEEN 20 is a nonionic detergent widely used in biochemical applications. It has been used as an emulsifying agent for the preparation of stable oil-in-water emulsions. TWEEN 20 has been used in pre-extraction of membranes to remove peripheral proteins (used at 2% for extraction of membrane-bound proteins). TWEEN 20 has been used as a blocking agent for membrane based immunoassays at a typical concentration of 0.05%. TWEEN 20 can be used for lysing mammalian cells at a concentration of 0.005 to 0.5%.