منابع مشابه
Determinants of axial osmotic gradients in the differentiating countercurrent system.
The renal medullary countercurrent system differentiates into its final segmental nephron function and geometry during perinatal development. The influence of these changes on the medullary longitudinal osmotic gradient cannot be evaluated by experimental studies. Therefore, a computation analysis using a differential equation model of the renal countercurrent system was applied to quantitate t...
متن کاملInvestigation of internal pressure gradients generated in electrokinetic flows with axial conductivity gradients
Field amplified sample stacking (FASS) is used to increase sample concentrations in electrokinetic flows. The technique uses conductivity gradients to establish a non-uniform electric field that accumulates ions within a conductivity gradient, and can be readily integrated with capillary electrophoresis. Conductivity gradients also cause gradients in near-wall electroosmotic flow velocities. Th...
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Exposure of an intact vertebrate eye to light bleaches the rhodopsin in the photoreceptor outer segments in spatially nonuniform patterns. Some axial bleaching patterns produced in toad rods were determined using microspectrophotometric techniques. More rhodopsin was bleached at the base of the outer segment than at the distal tip. The shape of the bleaching gradient varied with the extent of b...
متن کاملThe histology of Nanomia bijuga (Hydrozoa: Siphonophora)
The siphonophore Nanomia bijuga is a pelagic hydrozoan (Cnidaria) with complex morphological organization. Each siphonophore is made up of many asexually produced, genetically identical zooids that are functionally specialized and morphologically distinct. These zooids predominantly arise by budding in two growth zones, and are arranged in precise patterns. This study describes the cellular ana...
متن کاملWorldwide Distribution of the Stylasteridae (Cnidaria: Hydrozoa)*
Stylasterids show a pronounced insular distribution pattern, being found primarily off small (less than 36,000 km-) oceanic islands, atolls, and archipelagos, and on seamounts and submarine ridges. Although lowered salinity and increased sedimentation may exclude stylasterids from the coasts of larger continental land masses, it is more likely that the availability of hard substrate and the low...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1919
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1536393