View 3 Hour Detailed Portland Weather Forecast for Today. Portland 4 â 7 Day Weather Forecast Summary: Heavy rain (total 37mm), heaviest during Mon afternoon. Warm (max 24Â°C on Mon afternoon, min 14Â°C on Tue night). Winds decreasing (fresh winds from the SSE on Sun night, light winds from the N by Mon afternoon).
noun, plural: spindles. (1) A collection of minute fibers composed of microtubules, which are prominent during cell division, as mitotic spindle or mitotic apparatus''. (2) A specialized innervated muscle structure involved in the reflex action and in proprioception, as muscle spindle. (3) A species of a poisonous shrub or small tree of the genus Euonymus, originally used for making spindles used for spinning wool. (4) An EEG waveform that occurs during sleep, as sleep spindle.
The spindle apparatus, or simply the spindle, is a network of microtubules (also called spindle fibers) that forms within a dividing eukaryotic cell, both during mitosis and meiosis (see figure at right).ome of these microtubules attach to the cell walls, others attach to individual chromosomes at their kinetochores. It's the spindle that pulls the chromosomes from the metaphase plate to the poles. The radiating microtubules of the spindle form asters (see figure left) â aster is Greek for star.