RESUMO
We present a dual chamber atom chip apparatus for generating ultracold (87)Rb and (39)K atomic gases. The apparatus produces quasi-pure Bose-Einstein condensates of 10(4) (87)Rb atoms in an atom chip trap that features a dimple and good optical access. We have also demonstrated production of ultracold (39)K and subsequent loading into the chip trap. We describe the details of the dual chamber vacuum system, the cooling lasers, the magnetic trap, the multicoil magnetic transport system, the atom chip, and two optical dipole traps. Due in part to the use of light-induced atom desorption, the laser cooling chamber features a sufficiently good vacuum to also support optical dipole trap-based experiments. The apparatus is well suited for studies of atom-surface forces, quantum pumping and transport experiments, atom interferometry, novel chip-based traps, and studies of one-dimensional many-body systems.
RESUMO
Neuroglia in the teleost (Channa striatus) central nervous system are of two categories: (1) Ependymal gliocytes with long processes having vascular and/or superficial terminal thickenings beneath the pia and (2) Non-ependymal gliocytes which are either primitive (unipolar and bipolar) or of classical macroglial type (astrocytes and oligodendrocytes). Interfascicular oligodendrocytes have been found amidst non-myelinated nerve fibre bundles, suggesting that they have not reached the phylogenetic maturation towards myelinogenic activity.
