Nuclei of frog oocytes were isolated, fixed in OsO(4) or KMnO(4), and washed. Nuclear envelopes were then dissected off, placed on grids, and air-dried for electron microscopy. Envelopes from immature oocytes at the stage of beginning yolk deposition were compared with those from mature oocytes. Envelopes from the immature stage had "pores" whose annuli contained more material and showed centra...

Slow envelope fluctuations in the range of 2-20 Hz provide important segmental cues for processing communication sounds. For a successful segmentation, a neural processor must capture envelope features associated with the rise and fall of signal energy, a process that is often challenged by the interference of background noise. This study investigated the neural representations of slowly varyin...

In eukaryotes, chromosomes are encased by a dynamic nuclear envelope. In contrast to metazoans, where the nuclear envelope disassembles during mitosis, many fungi including budding yeast undergo "closed mitosis," where the nuclear envelope remains intact throughout the cell cycle. Consequently, during closed mitosis the nuclear envelope must expand to accommodate chromosome segregation to the t...

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Considerable attention has been given to the computation of geometric loci in dynamic geometry, from both graphical and equational viewpoints. Recent work has established a rigourous approach to the last issue, solving the subject for the algebraic realm. Nevertheless, although the automatic computation of envelopes could be seen as an analogous problem, there are cases where unexpected difficu...

As an alternative of the Shared Backup Path Protection (SBPP) method, we develop a framework for dynamic provisioning of survivable services based on the use of p-cycles to form a Protected Working Capacity Envelope (PWCE) within which dynamic provisioning of protected services is greatly simplified. Based on p-cycles, the restoration speed of rings is obtained, but with the capacity efficiency...

In railway transportation, the clearance provided between vehicle and structure gauge is an important safe space. The general rules methods for inspecting of rolling stock are based on a static in China. Dynamic envelope calculation considers displacement much more than before. paper combines dynamics simulation with Standard Metro Gauge to calculate dynamic gauge. lateral vibration offset caus...

By extending the system theory under the (min;+)-algebra to the time varying setting, we solve the problem of constrained tra c regulation and develop a calculus for dynamic service guarantees. For a constrained tra c regulation problem with maximum tolerable delay d and maximum bu er size q, the optimal regulator that generates the output tra c conforming to a subadditive envelope f and minimi...