Here we investigate whether certain face-centered cubic metals display a superior behavior of nanotwinned structures compared to others. We also address the question of an optimal lamella thickness that yields maximum strength and stability. Our analysis of the intrinsic stacking fault energies, csf , and the unstable stacking fault energies, cus, of Al, Pd, Cu and Ag, as well as our atomistic ...

Focused Ion beam (FIB) based tools have become the preferred method to prepare TEM lamellas, largely due to their high resolution imaging capabilities used to identify the site of interest. The quality and thickness of samples has become paramount in order to take full advantage of the ever increasing resolution in aberration corrected TEMs and accurately controlling the lamella thickness at th...

The direct contact of ultrathin polymer films with a solid substrate may result in thin film rupture caused by dewetting. With crystallisable polymers such as polyethyleneoxide (PEO), molecular self-assembly into partial ordered lamella structures is studied as an additional source of pattern formation. Morphological features in ultrathin PEO films (thickness < 10 nm) result from an interplay b...

In this study, the electromagnetic (EM) performance of talc/NiTiO3 composite was evaluated. The morphology of talc displayed a lamella structure; there were many nanoparticles of NiTiO3 coated on the talc lamella. Thermal destruction occurred, which increased the surface area from 2.51 m2 g-1 to 79.09 m2 g-1 at the calcined stage at 650°C. The presence of NiTiO3 increased dielectric loss and ma...

THE cutting of corneal lamellae for keratoplasty of a given thickness is laborious and by no means easy in the absence of abundant experience. Some devices for such procedures, such as Bock"s corneal knife, do not permit of sufficient accuracy, and the electric keratotome of Castroviejo is a very costly instrument. The simple and inexpensive device described below enables one to obtain a cornea...

The fine structure of the rod-bipolar synapse is described and illustrated. Each rod spherule possesses a large, single, oval or elongate mitochondrion approximately 0.5 x 2.0 microns. Surrounding the mitochondrion are elements of agranular endoplasmic reticulum. The bipolar dendrite projects into the lower pole of the spherule and usually terminates in two lobes separated by a cleft. The plasm...

Full-thickness palpebral reconstruction is a challenge for most surgeons. The complex structures composing the eyelid must be reconstructed with care both for functional and cosmetic reasons. It is possible to find in literature different methods to reconstruct either the anterior or posterior lamella, based on graft or flaps. Most patients involved in this kind of surgery are elderly. It is im...

BACKGROUND Various techniques have been proposed for reconstruction of the eyelid anterior lamella after carcinoma excision: among these are the transposition of skin flaps, and full-thickness skin grafts or combination of these two. AIM To present our experience in eyelid reconstruction with full-thickness skin grafts and to assess the aesthetic and functional outcomes. PATIENTS AND METHOD...

The organs and tissues of insects are mostly composed of single layers of cells separated from the circulating blood by thin connective tissue membranes (Wigglesworth, 1956a; Pipa & Cook, 1958). The supply of nutrients to such organs presents no problem. But the central nervous system is an exception. The ganglia are the only solid organs in the insect body. They consist of densely packed perip...

PURPOSE To introduce a new modification of transposition flap technique for reconstruction of the medial canthal region. METHODS This prospective study included 58 patients with the full thickness involvement of both upper and lower lid in the medial canthal area. Reconstruction of posterior lamella was performed by utilizing periosteal flaps and tarsoconjunctival grafts, and anterior lamella...