Social information behaviour in Bookshops: implications for digital libraries

We discuss here our observations of the interaction of bookshop customers with the books and with each other. Contrary to our initial expectations, customers do not necessarily engage in focused, joint information search, as observed in libraries, but rather the bookshop is treated as a social space similar to a cafe. Our results extend the known repertoire of collaborative behaviours, supporting further development of models of user tasks and goals. We compare our findings with previous work and discuss possible implications of our observations for the design of digital libraries as places of both information access and social interaction

Präparative gewinnung hochgereinigter lysosomenenzyme aus rattenlebern

RésuméBy means of a relatively simple procedure lysosomal enzymes from rat livers with 20% yield and a 50-fold enrichment were prepared. Density gradient centrifugation or tissue-preloading with triton VR 1339 is not necessary. Up to several liters of 50% liver homogenate may be used. Intact lysosomes are not obtained, because the crucial step in the tissue fractionation scheme is the selective release of lysosomal enzymes from a crude lysosome pellet by water extraction. The presence of neutral endopeptidases with high specific activities in lysosomes (estimated using azocasein and other proteins as substrates) is demonstrated