All known mechanisms of mitotic spindle orientation rely on astral microtubules. We report that even in the absence of astral microtubules, metaphase spindles in MDCK and HeLa cells are not randomly positioned along their x-z dimension, but preferentially adopt shallow β angles between spindle pole axis and substratum. The nonrandom spindle positioning is due to constraints imposed by the cell ...

AT THE END OF THIS MONTH, THE ANTARCTIC TREATY SUMMIT IN WASHINGTON, DC, WILL CELEBRATE the 50th anniversary of an international agreement that has been centered around science, promoting cooperation to manage nearly 10% of Earth for peaceful purposes since 1 December 1959 (see www.atsummit50.aq). As the world moves toward negotiating effective policies related to climate change, lessons from t...

The DivIVA protein helps to organize cell growth and polarity in Gram-positive bacteria by localizing specifically to the cytoplasmic membrane at the cell poles and division septum, independent of other proteins. In this issue, Lenarcic et al suggest that DivIVA localization depends on the concave geometry of the membrane at those sites. This recognition of membrane curvature is reminiscent of ...

Decay resistance of out-of-service poles was investigated to evaluate their effectiveness against biodegradation for possible recycling of these poles for composite products. Decay resistance was related to creosote content and creosote distribution in poles with service durations of 5 and 25 years and also freshly treated poles. Weathering of the poles had caused reduction in creosote content ...

introduction: the use of panoramic radiography has shown a remarkable expansion over the past 20 years. accurate positioning and preparation of patients is needed to avoid image distortion. the aim of this study was to evaluate the common errors on panoramic radiographs taken in the radiology department of rasht dental school. materials and methods: the study sample included 390 digital panoram...

In this paper, first a new algorithm for pole assignment of closed-loop multi-variable controllable systems in a prescribed region of the z-plane is presented. Then, robust state feedback controllers are designed by implementing a neural fuzzy system for the placement of closed-loop poles of a controllable system in a prescribed region in the left-hand side of z-plane. A new method based on the...

This paper proposes a method to specify straightforwardly poles of controllers of strongly stable generalized predictive control(GPC) systems using symbolic computation software. Strongly stable control system is defined as a system having both of stable poles of closed loop systems and stable poles of controllers. That is, the system is stable even when feedback loop is cut by an accident. The...

Prony 's method is employed in spectral domain estimation to model epilepsy seizure from human's electroencephalograph (EEG).This method assumes that the original signal is a sum of damped complex exponential sinusoids. The method has the best frequency resolution compared to Auto Regression (AR) parametric methods. Modeling of the EEG Epilepsy signal is based on the poles of the signal. Comput...