While in R2, every two polygons of the same area are scissors congruent (i.e., they can be both decomposed into the same finite number of pair-wise congruent polygonal pieces), in R3, there are polyhedra P and P ′ of the same volume which are not scissors-congruent. It is therefore necessary, given two polyhedra, to check whether they are scissorscongruent (and if yes – to find the correspondin...

This work focuses on the segmentation of axonal structures in digital images of organotypic slice co-cultures. An image processing chain is presented, which relies on anisotropic diffusion for preprocessing of the images and the intelligent scissors method for segmentation. This method requires manual user interaction to set the starting points. To overcome this drawback, the initial parameters...

Autophagic lysosome reformation (ALR) is a cellular process in which lysosomes are reformed through scission of protolysosomes from tubular structures extruded from autolysosomes. Despite recent progress, the molecular mechanism of ALR is far from clear. A paper in this issue of The EMBO Journal has identified lysosome-localized PI(3)P, which is generated by the VPS34–UVRAG complex in an mTOR-d...

THE problem of the perfect cataract section and how it should be made is prominent in the minds of ophthalmic surgeons. We are all aware that the success of a lens extraction is substantially dependent upon the accuracy of the section, and there are few of us who cannot recall tragedies or near-tragedies resulting from the improper opening of the eye. With this in mind, and in spite of average ...

We show that a Bose-Einstein condensate with a vortex lattice in a rotating anisotropic harmonic potential exhibits a very low frequency scissors mode. The appearance of this mode is due to the SO 2 symmetry breaking introduced by the vortex lattice. The corresponding Goldstone mode in an isotropic trap becomes, in an anisotropic trap, a scissors mode, whose frequency is finite and tends to zer...

introduction: the purpose of this study was to evaluate the morphologic surface of gutta­percha cones after cutting with different methods. materials and methods: the apical 3 millimeters of forty standardized, gutta-percha cones size 40 were cut off using scissors or a scalpel against a glass slab. the samples were then examined under scanning electron microscopy (sem) for topographic deformit...

BACKGROUND The aim of the study was the evaluation of the feasibility of glossectomy using an ultrasonic-activated surgical instrument. METHODS This was a prospective study of 13 consecutive patients who underwent glossectomy (12 partial and one total) for carcinoma of tongue with the use of ultrasonic scissors. RESULTS All 13 patients had glossectomy, with median blood loss of 0 mL. The gl...

BACKGROUND The aim of this study was to compare reliability in handling and function of resterilised and single-use disposable ultrasonic scissors. METHODS In a prospective randomized study, the surgeon blindly tested new and resterilised ultrasonic scissors. The parameters were force of activation, cutting effect, coagulation effect, error messages and disturbing generator noise. RESULTS 5...

Tracking plays an important role in Augmented Reality (AR) applications. One possibility to find and track an object is to attach a fixed arrangement of balls to it and use them to determine its three-dimensional position. Medical instruments like scissors could also be tracked that way but the ball arrangement can be disturbing while working with the instrument. For medical scissors another ap...