@article {1694, title = {Properties of a collagenolytic enzyme from Bipalium kewense}, volume = {661}, year = {1981}, month = {1981/10/13}, pages = {213 - 220}, abstract = {

A collagenolytic enzyme from the land planarian Bipalium kewense has been purified by preparative isoelectric focusing. The enzyme has a molecular weight of 47 000 \± 2 000 and appears to be dimeric. It has an isoelectric point of 4.6 \± 0.1 and a high content of acidic amino acids. The amino acid composition of the Bipalium collagenase is similar to that of human skin fibroblast collagenases but clearly different from previously reported collagenolytic proteases from other invertebrates, Uca pugilator and Hypoderma lineatum. In its action on guinea-pig collagen, the enzyme produces distinct products, at low incubation temperatures, different from those produced by vertebrate and other invertebrate collagenolytic enzymes. These products have glycine as their N-terminal amino acids. As determined by viscosity measurements, the Bipalium collagenase is more active on invertebrate, earthworm, collagen than it is on the vertebrate, Type I guinea-pig skin, collagen. The Bipalium collagenase differs from both bacterial and vertebrate collagenases as well as from invertebrate, collagenolytic serine proteases.

}, keywords = {(Bipalium kewense), Amino acid composition, Collagen, Collagenase}, isbn = {0005-2744}, url = {http://www.sciencedirect.com/science/article/pii/0005274481900061}, author = {Landsperger, William J. and Peters, Erwin H. and Dresden, Marc H.} } @book {582, title = {British Planarians}, year = {1981}, publisher = {Cambridge University Press}, organization = {Cambridge University Press}, address = {Cambridge}, author = {Ian R. Ball and T. B. Reynoldson} } @article {781, title = {Dugesia hepta, nuova specie di Planaria di acqua dolce di Sardegna appartenente alla superspecie Dugesia gonocephala (Dug{\`e}s) (Turbellaria, Tricladida)}, journal = {Bollettino della Societa Sarda Scienze Naturali}, volume = {20}, year = {1981}, pages = {97-107}, abstract = {

A planarian belonging to the group D. gonocephala s.l. was found in 13 sites in Sardinia (11 in the catchment area of the Rio Mannu of Porto Torres and 2 in that of the Coghinas). It is morphologically related to D. benazzii Lepori of Sardinia and Corsica but presents a different karyotype: 2n = 14; n = 7 chromosomes instead of 2n = 16; n = 8 chromosomes. The latter is the most common in the superspecies D. gonocephala of central European and Mediterranean distrubution areas. The planarian in question was considered a distinct species with the group D. gonocephala s.l. and the denomination D. hepta sp. nov. is proposed.

}, issn = {0392-6710}, author = {Maria Pala and Salvatore Casu and Rosa Alba Vacca} }