| abstract |
PROBLEM TO BE SOLVED: To provide a method for producing a highly productive recombinant collagen-like polypeptide, and to provide a more uniform photographic AgX emulsion material using the polypeptide and the polypeptide. A tabular silver halide emulsion in which tabular grains occupy 75% or more of the total grain projected area, wherein the emulsion is nucleated in the presence of a nucleation peptizer and then grown in the presence of a growth peptizer. A silver halide emulsion having silver halide grains, wherein at least one peptizer is a substantially pure collagen-like material prepared by genetic engineering, wherein the peptizer has an amino acid sequence having more than four different amino acids. A method for preparing the AgX emulsion. A method for producing a recombinant collagen-like polypeptide, preferably having a nucleic acid sequence encoding a collagen-like polypeptide by a microorganism to a degree exceeding 0.95 gram / liter, wherein the recombinant collagen does not have a helical structure, preferably Wherein the expression occurs in microorganisms other than E. coli or Saccharomyces cerevisiae. [Selection figure] None. |