In cleaving Xenopus eggs, exposure to nocodazole or cold shock prevents the addition of new plasma membrane to the cleavage plane and causes furrows to recede, suggesting a specific role for microtubules in cytokinesis. Whole-mount confocal immunocytochemistry reveals a ring of radially arranged, acetylated microtubule bundles at the base of all advancing cleavage furrows, from the first cleava...

low level of efficiency is a main problem of surface irrigation systems that is due to their poordesign and management. furrow inflow rate and cut off time are the most important design parametersthat affect the efficiency of furrow irrigation. in this study, furrow irrigation condition of amir kabiragro-industry sugarcane fields was simulated with winsrfr3.1 model. then, irrigation performance...

sugarcane is cultivated in extensive areas in khuzestan it is irrigated through hydro-flume and in furrows. for an evaluation of the effect of deficit- irrigation on sugarcane yield, this experiment was conducted. the treatments consisted of the conventional irrigation method (blank), variable, every other irrigation, (by alternative furrows) and invariable every other irrigation (by fixing the...

Nearly horizontal, quasi-periodic erosional features of 7-m average transverse wavelength and of order 100-m length occur in scattered locations from 3.5 to 9 km from the crater at Mount St. Helens under deposits of the lateral blast of May 18, 1980. We attribute the erosional features to scouring by longitudinal vortices resulting from flow instabilities induced by complex topography, namely, ...

This study was aimed to evaluate the Aqua program in calibration and validity its use simulation productive water characteristics of maize crop.. The experiment conducted two irrigation methods, sprinkler surface irrigation, cultivation methods are borders (lines) furrows (lines then furrows) for cultivars maize, a hybrid (unlocal) local variety. results that reduced consumption compared as it ...

Accumulated evidence from a variety of types of animal cells points to the involvement of a "contractile ring" in constricting cells to form cleavage furrows during cytokinesis (7, 12) . Ultrastructural studies of dividing cells showing microfilaments in close proximity to the plasma membrane in regions where furrows are present suggest that microfilaments may be the structural manifestation of...