Evaluation of materials for louse control

A simple procedure for evaluation of the effectiveness of different louse-killing substances is described. Factors likely to influence the results are discussed, and it is shown to what extent differences in age, mode of application and interaction of carriers are able to influence the insecticidal effect. A number of substances was tested by the methods described and their potency against lice determined by comparison of the minimum time of exposure necessary to give 100% kill.     

Rheological properties of cross-linked hyaluronan-gelatin hydrogels for tissue engineering

Hydrogels that mimic the natural extracellular matrix (ECM) are used in three-dimensional cell culture, cell therapy, and tissue engineering. A semi-synthetic ECM based on cross-linked hyaluronana offers experimental control of both composition and gel stiffness. The mechanical properties of the ECM in part determine the ultimate cell phenotype. We now describe a rheological study of synthetic ECM hydrogels with storage shear moduli that span three orders of magnitude, from 11 to 3 500 Pa, a range important for engineering of soft tissues. The concentration of the chemically modified HA and the cross-linking density were the main determinants of gel stiffness. Increase in the ratio of thiol-modified gelatin reduced gel stiffness by diluting the effective concentration of the HA component.     

Das verhalten der kleiderlaus bei ausschaltung ihrer symbionten

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