The present invention relates to microspheres comprising hyaluronan derivatized with a bifunctional crosslinker to form microspheres. Community eligibility profiles of the Communities in a collective set of Communities are applied towards prospective member’s profile information. The dust core can be produced by pressure-molding a ferromagnetic powder, a lubricant and a trifunctional alkyl-phenyl silicone resin binder and heat treating the molded core at a temperature in the range of about 300 to about 800 C. The valve element and the corresponding structure on the receptacle cooperate so that the container can only be received in and removed from the receptacle when the valve is closed. Digital image data can be transferred between a memory attached to the memory card slot part and a small disk inserted into the disk drive part. A pulling eye is slidably disposed on the main body.