Two types of laminar flows of non-Newtonian fluids in annuli with stationary outer cylinder are analysed from the viewpoint of existence of an exact analytical or almost exact analytical (quasisimilarity) solution relating volumetric flow rate and axial pressure gradient. The exact analytical solution is derived for the Vocadlo (RobertsonStiff) fluids when flow is caused simultaneously by the i...

Morphogenesis of influenza virus is a poorly understood process that produces two types of enveloped virion: approximately 100-nm spheres and similar diameter filaments that reach 20 microm in length. Spherical particles assemble at plasma membrane lipid rafts in a process independent of microfilaments. The budding site of filamentous virions is hitherto uncharacterised but their formation invo...

The unicellular organism, Noctiluca, has been examined with the electron microscope. The nucleus is small compared to the very large size of the cell, but the nuclear border has an organization which indicates an active nucleocytoplasmic exchange. Whereas annuli are missing over most parts of the nuclear membrane proper, there are "annulated vesicles" in a layer inside the nuclear membrane. The...

Three-quarters of a century ago Gestalt psychologist Kurt Koffka described a remarkable effect: when a contiguous gray ring is placed on a background half one shade of gray, half another, the ring appears homogeneous. However, if the ring is divided, the two halves of the ring appear different shades of gray, the half of the ring on the darker background appearing lighter than the half of the r...

A new species of Discocriconemella and the male of Discocriconemella degrissei are described from Minas Gerais state of Brazil. Discocriconemella mineira n. sp. differs from D. discolabia by having a longer stylet (61-71 vs. 35-47 mum) and fewer body annuli (78-88 vs. 155-174), and from D. inarata by the longer stylet (61-71 vs. 51-61 'm) and shorter body length (253-342 vs. 354-486 mum). It di...

EKHOLM et al. (1962) and HERMAN et al. (1964) observed occasional circular formations which have an inner structure composed of one central and seven marginal annuli in glandular lumina and ductal lumina of rat pancreas. WINBORN (1963) also found the same structures in the glandular and in the intercalary ductal lumina of the Saimili monkey pancreas, and they thought these circular formations r...

Deduce the velocity distribution of steady flow of an incompressible fluid of density ρ and viscosity η between two parallel, coaxial annular plates of inner radii r1, outer radii r2 and separation h when pressure difference ∆P is applied between the inner and outer radii. As an exact solution of the Navier-Stokes equation appears to be difficult, it suffices to give an approximate solution ass...

The Campanian of Alberta and Saskatchewan produce the oldest hiodontid fossils from North America, which are represented only by isolated centra. As such, very little is known about the taxonomic affinities, morphology, life history characteristics, and paleoecology of the taxon or taxa represented by the Cretaceous centra. To study the age and growth characteristics of Hiodontidae from the Cre...