(DE4444893-A1)      The following are claimed: (A) peptides or peptide analogues of formula (I), and salts of (I): R-A-B-C-D-E-OH (I) A = Ala, Gly or Leu; B = Ala, Ser, Gly-Gly or Ser-Ser; C = Ala, Ala-Ala, Leu-Leu, Ala-Ala-Ala, Arg-Gly-Asp or Leu-Leu-Leu; D =Ala or Ser; E = Ala, Leu or Pro-Lys; R = H, HS-Alk-CO, HS-Alk-CO-NH-Alk'-CO, Trt-S-Alk-CO, Trt-S-Alk-CONH-Alk'OCO or 1,2-dithiocyclopentan-3-(CH2)4-CO; Alk, Alk' = 1-11C alkylene; Trt = triphenylmethyl; Provided that R can only be H when at least one of A-E is other than Ala. (B) Synthetic peptide layer comprising one or more peptides (I) which are linked via sulphur bridges to a gold surface. The C-terminal gps. are linked (via an amide bond) to a further peptide sequence with donor properties, so that bonds to corresp. acceptor molecules may be prepd. (C) Synthetic cell membranes comprising a gold carrier which is covalently linked with a peptide (I) via a sulphur bridge. The C-terminal side of the peptides is linked with lipid residues, which in turn form a membrane-analogous lipid bilayer with liposomes which are present.    USE -   The peptide layers may be used for research into acceptor molecules. They may be used, e.g., for screening of inhibitors or ion pumps, or for construction of sensors of substrates or inhibitors of pump proteins. For example, herbicides which inhibit the photochemical reaction centre may be tested. The layers/membranes may also be used as solar cells or membrane models.    (JP10510277-W)      The following are claimed: (A) peptides or peptide analogues of formula (I), and salts of (I): R-A-B-C-D-E-OH (I) A = Ala, Gly or Leu; B = Ala, Ser, Gly-Gly or Ser-Ser; C = Ala, Ala-Ala, Leu-Leu, Ala-Ala-Ala, Arg-Gly-Asp or Leu-Leu-Leu; D =Ala or Ser; E = Ala, Leu or Pro-Lys; R = H, HS-Alk-CO, HS-Alk-CO-NH-Alk'-CO, Trt-S-Alk-CO, Trt-S-Alk-CONH-Alk'OCO or 1,2-dithiocyclopentan-3-(CH2)4-CO; Alk, Alk' = 1-11C alkylene; Trt = triphenylmethyl; Provided that R can only be H when at least one of A-E is other than Ala. (B) Synthetic peptide layer comprising one or more peptides (I) which are linked via sulphur bridges to a gold surface. The C-terminal gps. are linked (via an amide bond) to a further peptide sequence with donor properties, so that bonds to corresp. acceptor molecules may be prepd. (C) Synthetic cell membranes comprising a gold carrier which is covalently linked with a peptide (I) via a sulphur bridge. The C-terminal side of the peptides is linked with lipid residues, which in turn form a membrane-analogous lipid bilayer with liposomes which are present.    USE -   The peptide layers may be used for research into acceptor molecules. They may be used, e.g., for screening of inhibitors or ion pumps, or for construction of sensors of substrates or inhibitors of pump proteins. For example, herbicides which inhibit the photochemical reaction centre may be tested. The layers/membranes may also be used as solar cells or membrane models.    (US5962638-A)      The following are claimed: (A) peptides or peptide analogues of formula (I), and salts of (I): R-A-B-C-D-E-OH (I) A = Ala, Gly or Leu; B = Ala, Ser, Gly-Gly or Ser-Ser; C = Ala, Ala-Ala, Leu-Leu, Ala-Ala-Ala, Arg-Gly-Asp or Leu-Leu-Leu; D =Ala or Ser; E = Ala, Leu or Pro-Lys; R = H, HS-Alk-CO, HS-Alk-CO-NH-Alk'-CO, Trt-S-Alk-CO, Trt-S-Alk-CONH-Alk'OCO or 1,2-dithiocyclopentan-3-(CH2)4-CO; Alk, Alk' = 1-11C alkylene; Trt = triphenylmethyl; Provided that R can only be H when at least one of A-E is other than Ala. (B) Synthetic peptide layer comprising one or more peptides (I) which are linked via sulphur bridges to a gold surface. The C-terminal gps. are linked (via an amide bond) to a further peptide sequence with donor properties, so that bonds to corresp. acceptor molecules may be prepd. (C) Synthetic cell membranes comprising a gold carrier which is covalently linked with a peptide (I) via a sulphur bridge. The C-terminal side of the peptides is linked with lipid residues, which in turn form a membrane-analogous lipid bilayer with liposomes which are present.    USE -   The peptide layers may be used for research into acceptor molecules. They may be used, e.g., for screening of inhibitors or ion pumps, or for construction of sensors of substrates or inhibitors of pump proteins. For example, herbicides which inhibit the photochemical reaction centre may be tested. The layers/membranes may also be used as solar cells or membrane models.