Abstract: A card or pass comprising at least two layers, suitably mated, of shock-resistant plastic film transparent to infrared light. Inside these layers, identification optical codes, readable in transparency by means of infrared rays, are printed. Inside these layers still, a seat, suitably shaped to receive an integrated memory circuit connected to the outside by means of four contacts, is provided. Each contact has a very precise function according to its connection with the circuit which comprises an integrated memory circuit of EEPROM technology with interfacing protocol on two wires and with voltage converter on chip so as to eliminate the necessity of several feeding voltages.

Abstract: Pharmacologically active tripeptides, with at least a retro-inverted peptidic bond, definable by means of the following general formulae: ##STR1## their pharmaceutically acceptable salts, esters or alkyl amides, whereinR.sub.1 represents a hydrogen atom, an alkyl group with a maximum of 7 carbon atoms, an aryl, hydroxyalkyl or hydroxyarylalkyl, guanidylalkyl, amino-alkyl, alkyl-oxy-alkyl, acylamino-alkyl, imidazolylalkyl, indolyl-alkyl, mercapto alkyl, alkylmercaptoalkyl, carbamoyl-alkyl, carboxyalkyl, alkyl-carbamoylalkyl or alkyloxy-carbonylalkyl group;R.sub.2 represents a ##STR2## group, Z is an OH, OR.sub.3, NH.sub.2, NHR.sub.3 group, whereinR.sub.3 represents an alkyl group with a number of carbon atoms comprised within the range of from 1 to 10.