It is well known that a tip-focused intracellular Ca2+ gradient and the meshwork of short actin filaments at the tip region are necessary for pollen tube growth. However, little is known about the connections between the two factors. Here, a novel Ca2+-dependent actin-binding protein with molecular mass of 41 kD from lily (Lilium davidii) pollen (LdABP41) was isolated and purified with DNase I ...

background: the technique of vertical dome division or tip defining, involves incising the lateral crura and vestibular skin at or lateral to the dome or tip defining point. the incision di-vides the lower lateral cartilage into a lateral segment and a medial segment, which are advanced anteriorly and sutured together to increase tip projection. the present study aimed at assessing a new vertic...

This report describes the design and control of a two-joint, two-link flexible arm. Our purpose has been to build an efficient arm in the sense that most of the energy provided by the motors is spent in doing the task (moving the tip mass) instead of moving the arm structure. In order to achieve that, we designed a flexible arm that has most of its mass concentrated on the tip. We wanted also t...

This paper presents a method for widening bandwidth by using non-uniform mass which use the concept of center gravity. Piezoelectric acts as tool to convert vibration energy electrical energy. The displacement from liquid movement plays role enhance beam bends. is widened 2 times higher compared without tip and 1.6 increased than that solid tip-mass. High viscosity density will give greater eff...

The design of a combined scanning electrochemical microscope-quartz crystal microbalance (SECM-QCM) with separate potential control of the tip and substrate is described. Both lateral and vertical tip movements near the substrate affect the QCM resonant frequency because of perturbations of the longitudinal and shear waves of the quartz crystal (QC) acoustic wave sensor. The SECM-QCM was used t...

In the framework of this master thesis, a numerical study has been carried out in order to investigate the effect of tip geometry on the tip leakage flow and heat transfer features in a unshrouded high pressure axial flow turbine stage designed by Erhard [10]. Four different tip profiles were considered, namely a default flat tip, a modified flat tip, a modified double squealer tip and a modifi...

Oxygen evolution electrocatalysts in acidic media were studied by scanning electrochemical microscopy (SECM) in the substrate generation-tip collection (SG-TC) imaging mode with a 100 microm diam tip. Pure IrO2 and Sn(1-x)Ir(x)O2 combinatorial mixtures were prepared by a sol-gel route to form arrays of electrocatalyst spots. The experimental setup has been developed to optimize screening of ele...