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Modelling the material uptake and deposition of the mytilus edulis in the Baltic coastal ecosystem

100%

Zemlys P. , Daunys D. , Razinkovas A.

tom Vol. 32, No. 2

53-79

A model was developed to describe the material uptake and biodeposition of bivalve Mytilus edulis. The existing blue mussel organism level models are based on contradictory assumptions and no agreement has still been found regarding the processes and environmental factors to be included into the model. A reconciliation of contradictory approaches was successfully done in the present model. Using seston concentration, seston organic content and mussel size as input data, the model is able to predict the uptake of suspended material, selection of organic particles and material allocation as pseudofaeces, ingested, assimilated fractions and faeces. The results of the model application to mussels in the south-eastern Baltic conditions are discussed.

Selected properties of concrete with recycled aggregate subjected to biodeposition

100%

Grabiec A. M. , Zawal D. , Starzyk J. , Krupa-Palacz D.

tom Vol. 67, nr 6

1171--1179

In this paper, the influence of biomodification of recycled concrete aggregate (RCA) on some properties of concrete was studied. Sporosarcina pasteurii strain was chosen for biodeposition process. The RCA came from parent concretes with varying w/c ratio. Recycled aggregate concrete (RAC) with two levels of w/c ratio, made from RCA not subjected to biomodification, was treated as reference. Compressive strength, water absorption and sorption of concretes were tested. The most significant influence of the aggregate biomodification was found in the case of sorption and this effect was highest for RAC made from the aggregate yielding from better quality parent concrete.