3,3′-Dibutanoyl-1,1′-(o-phenylene)dithiourea

3,3′-Dibutanoyl-1,1′-(o-phenyl­ene)dithio­urea

The mol-ecular conformation of the title compound, C(16)H(22)N(4)O(2)S(2), is stabilized by two intramolecular N-H⋯O hydrogen bonds. The crystal packing shows N-H⋯O and N-H⋯S hydrogen bonds.

O-33: Serum Anti-M

1 6 O ct 2 00 7 Pion - nucleon P 33 and P 11 scatterings in the Lippmann - Schwinger approach

We study the pion-nucleon P33 and P11 scattering, where the Delta and the Roper resonances are seen, respectively. We use the Lippmann-Schwinger equation extended to couple to a one-body state, and investigate nature of these resonances by taking and omitting a one-baryon state into account. We see validity and puzzle of the standard quark model interpretation, for the Delta and the Roper reson...

O 11: Diagnosis and Management of Neuromyelitis Optica

Typical NMO is characterized by simultaneous or sequential acute transverse myelitis and optic neuritis. Spinal cord lesions extending over 3 or more vertebral segments and normal brain imaging are the typical MRI findings in NMO. In typical cases with positive NMO antibody the diagnosis is easy but in seronegative and atypical cases with different clinical manifestations and MRI features the d...

Π 11 relations and paths through O ∗

When bounds on complexity of some aspect of a structure are preserved under isomorphism, we refer to them as intrinsic. Here, building on work of Soskov [33], [34], we give syntactical conditions necessary and sufficient for a relation to be intrinsically Π1 on a structure. We consider some examples of computable structures A and intrinsically Π1 relations R. We also consider a general family o...