agricultural products are affected by static and dynamic forces at different stages of harvesting, handling and processing. in most cases, the damages are inflicted upon raw products. in the present study the mechanical properties of tomato fruits were found out for two cultivars (super bta and petoerly ch), during 4 periods of time (1, 5, 10 and 15 days past harvest), and at two levels of frui...

Mechanical force is needed to mediate endocytosis. Whether actin, the most abundant force-generating molecule, is essential for endocytosis is highly controversial in mammalian cells, particularly synapses, likely due to the use of actin blockers, the efficiency and specificity of which are often unclear in the studied cell. Here we addressed this issue using a knockout approach combined with m...

It is well established that chaperones modulate the protein folding free-energy landscape. However, the molecular determinants underlying chaperone-mediated mechanical folding remain largely elusive, primarily because the force-extended unfolded conformation fundamentally differs from that characterized in biochemistry experiments. We use single-molecule force-clamp spectroscopy, combined with ...

1. Abstract In this report, design, operation principles and finite elements analysis of a novel MEMS based mechanical testing platform for highly deformable nanofibers and nanowires is presented. Mechanical actuation is accomplished through a group of five thermal actuators by sequencing electrical inputs to a coordinated grip-release and pulling mechanism. This new actuation device is capable...

To produce a torque about a joint in the human body there must be sufficient drive to excite motor neurones in the spinal cord to discharge action potentials. The number of motor neurones that are recruited, and the rate at which those motor neurones discharge action potentials, is directly linked to the summation of twitch forces in the muscle. However, the potential to generate a torque also ...

in this research using the theory of induction motor (um), a um with liquid as secondary part is planned and manufactured. the main objective for planning of this motor is to investigate the possibility of chemical liquids pumping such as liquid poison and acids. results of many laboratory tests are shown to conclude that pumping force in the manufactured pump is dependent on many factors su...

The depression of isometric force after active shortening is a well-accepted characteristic of skeletal muscle, yet its mechanisms remain unknown. Although traditionally analyzed at steady state, transient phenomena caused, at least in part, by cross-bridge kinetics may provide novel insight into the mechanisms associated with force depression (FD). To identify the transient aspects of FD and i...

A fast design variation technique for mechanical systems is presented. It is used to interactively optimize mechanical characteristics while “self-assembling” or satisfying large systems of mechanical constraints. The high speed method is central to providing inverse dynamics force feedback in haptics and control applications. Performance advantages with the use of augmented coordinates for inv...