M and O and S

And Cubic F O R M S

O  M S-o T H

We compare classes of finite relational structures via monadic second-order transductions. More precisely, we study the preorder C ⊑ K : iff C ⊆ τ(K) for some transduction τ. If we only consider classes of incidence structures we can completely describe the resulting hierarchy. It is linear of order type ω + . Each level can be characterised in terms of a suitable variant of tree-width. Canoni...

M M  O-b D S

We propose an alternative characterisation of object-based distributed systems in terms of algebraic structures and topological spaces. Some examples are given in order to attest the adequacy of this approach to the subject. We also illustrate a method of transference of results from these mathematical theories that can further contribute to the advancement of distributed systems theory.

.m~zm~ ~o~s 221

While Amoeba proteus has long been the subject of extensive cytological and cytochemical studies, investigations with the electron microscope have been limited principally to the nuclear membrane (1-3). The observations reported herein were made in the course of studies intended to correlate cytochemistry (4) with knowledge of fine structure obtained with the electron microscope. I t is felt th...

O-33: Serum Anti-M