How to test for partially predictable chaos.

For a chaotic system pairs of initially close-by trajectories become eventually fully uncorrelated on the attracting set. This process of decorrelation can split into an initial exponential decrease and a subsequent diffusive process on the chaotic attractor causing the final loss of predictability. Both processes can be either of the same or of very different time scales.

Cell type specificity and developmental expression of the L2/HNK-1 epitopes in mouse cerebellum.

The developmental expression of carbohydrate epitopes recognized by monoclonal antibodies HNK-1 and L2 was studied in tissue sections and cultures of mouse cerebellum. At all ages studied the 2 antibodies had identical staining patterns. In cultures of embryonic and early postnatal mice some, but not all cells of all 3 major neural cell types, neurons, astrocytes and oligodendrocytes, but not fibronectin-positive fibroblast-like cells were labeled by the antibodies.

Neural cell adhesion molecules and myelin-associated glycoprotein share a common carbohydrate moiety recognized by monoclonal antibodies L2 and HNK-1.

Cell surface molecules have been implicated in cell interactions which underlie formation of the nervous system. The analysis of the functional properties of such molecules has profited from the combined use of antibodies and cell culture systems. It has been suggested that the interplay between these molecules modulates cell-to-cell interaction at critical developmental stages.