Abstract: Systems and methods are described for providing an electronic shopping system/service. A computer server for providing an electronic shopping service includes a purchase predictive data collector configured to collect purchase predictive data of a user, a product purchase interval predictor configured to predict a product purchase interval of a product for the user at least partially based on the purchase predictive data of the user, and a product recommender configured to recommend additional products to the user at least partially based on the purchase predictive data of the user and to provide data analytics and shopper marketing to retailers, wholesalers, or consumer packaged goods (CPG) companies.

Abstract: Collagen-based medicinal dressings are produced by freezing a collagen aqueous polydispersion obtained from cattle hide in a concentration of 0.66 to 2% by weight at a temperature of at most -65.degree.C and subjecting the frozen polydispersion to vacuum at a pressure of 10.sup.-.sup.3 to 10.sup.-.sup.5 torr for a period of 24 to 48 hours while maintaining a temperature thereof of at most +35.degree.C. The resulting spongy mass has a density of 0.03 to 0.06 gram/cm.sup.3.