The theridiid genus Dipoena Thorell, 1869 is distributed worldwide. Dipoena are recognized by male with carapace often high, cylindrical, with grooves or depression on dorsum; carapace of female rarely modified, sometimes high. In this paper six new species of Dipoena are described from Brazil, one from the state of Mato Grosso do Sul: Dipoena bonitensis new species, three from São Paulo: Dipoe...

A novel approach to “direct-write” negative nano-lithography, based on biological specificity, where a proteolytic enzyme is used to etch grooves in a hardened protein layer. We are using trypsin to engrave features in a BSA layer, while flowing the trypsin solution via a nano-pipette (controlled by a SPM) to the surface. Trypsin is a proteolytic enzyme that cleaves very specifically on the car...

Let G be a linear algebraic group over a field k of characteristic p > 0, and suppose that the unipotent radical R of G is defined and split over k. By a Levi factor of G, one means a closed subgroup M which is a complement to R in G. In this paper, we give two results related to the descent of Levi factors. First, suppose ` is a finite Galois extension of k for which the extension degree [` : ...

We study singular real-analytic Levi-flat hypersurfaces in complex projective space. We give necessary and sufficient conditions for such a hypersurface to be a pullback of a real-analytic curve in C via a meromorphic function. We define the rank of a real hypersurface and study the connections between rank, degree, and the type and size of the singularity for Levi-flat hypersurfaces. Finally, ...

We give a characterization of hyperbolic Kato surfaces in terms of the existence of an automorphic Green function on a cyclic covering. This is achieved by analysing a naturally defined Levi-flat foliation, and by perturbing certain Levi-flat leaves to strictly pseudoconvex hypersurfaces. 2010 Mathematics Subject Classification: Kato surfaces, Levi-flat foliations, plurisubharmonic functions.

In this paper we discuss some structure problems regarding the foliation of Levi flat manifolds, i.e. those CR manifolds which are foliated by complex leaves or, equivalently, whose Levi form vanishes. Levi flat manifolds have a particular significance among CR manifolds, since due to their degenerate nature they often behave as “limit case”, or they are an obstruction in extension problems of ...

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The pivotal topic of this paper is the study of Levi-flat real hypersurfaces S with circular fibers in a rank 1 affine bundle A over a Riemann surface X. (To say that S is Levi-flat is to say that S admits a foliation by Riemann surfaces; equivalently, in the language of [SuTh], S may be said to prescribe a holomorphic motion of circles through A.) After setting notation and terminology in §2 w...

Debugging of Logic Programs Marco Comini Giorgio Levi Dipartimento di Informatica, Università di Pisa, Corso Italia 40, 56125 Pisa, Italy {comini, levi}@di.unipi.it