The evolution of the ejected liquid sheet, or lamella, created after impact of a liquid drop onto a solid surface is studied using high-speed video in order to observe the detailed time evolution of the thickness of the rim of the lamella. Since it has been suggested that splashing behavior is set at very early times after impact, we study early times up to D0 /U0, where D0 and U0 are the diame...

PURPOSE To report the predictability of a nomogram for ultrathin donor lamella creation for Descemet-stripping automated endothelial keratoplasty (DSAEK) with an automated microkeratome. SETTING Instituto de Oftalmología La Arruzafa, Córdoba, Spain. DESIGN Prospective nonrandomized consecutive case series. METHODS This study enrolled eyes of consecutive patients in which DSAEK was perform...

The X(2) holder enables the effective production of thin, electron transparent samples for high-resolution transmission electron microscopy (HRTEM). Improvements to the X(2) holder for high-quality transmission electron microscopy (TEM) sample preparation are presented in this paper. We discuss the influence of backscattered electrons (BSE) from the sample holder in determining the lamella thic...

The embryological development of the connective tissue sheath around the nervous system has been investigated in Schistocerca gregaria. The sheath cells appear to be derived from outlying ganglion cells. The neural lamella is first visible when the embryo is 9 days old and it increases in thickness until hatching occurs on the twelfth day. It is produced entirely by the sheath cells. The sheath...

In this article, we present a strategy to decouple the relative influences of colony, domain and lamella boundary strengthening in fully lamellar titanium aluminide alloys, using a physics-based crystal plasticity modeling strategy. While lamella and domain boundary strengthening can be isolated in experiments using polysynthetically twinned crystals or mircomechanical testing, colony boundary ...

The most common tumor of the eyelids is basal cell carcinoma. At this site, excision can be performed using Mohs micrographic surgery. Reconstruction of the upper or lower eyelids is a challenge due to their structural complexity and their important function. The eyelid has classically been divided into the anterior lamella, comprising skin, subcutaneous cellular tissue, and the orbicularis ocu...

AIMS To compare two different techniques for preparation of pre-cut lamellar corneal tissue for Descemet stripping automated keratoplasty. BACKGROUND/METHODS Eight donor lenticules were created with a full pass of the microkeratome blade, which resulted in a posterior lamella and a free cap (anterior lamella off group (AL-off)). Contralateral donor lenticules were created with an incomplete p...

Thin and ultrathin films of polyethylene of variable thickness are obtained from aqueous dispersions of prefabricated nanoscale crystals by spin-coating. Continuous films with a thickness of only 15 nm, up to 220 rim, homogeneous over hundreds of pm, or assembled discontinuous monolayers of flat-on lamella particles were prepared, depending on the solids content of the dispersion employed, as r...

To improve visual and refractive outcomes, microkeratome-assisted lamellar keratoplasty for the treatment of keratoconus (exchange of a 9.0-mm anterior recipient lamella with a 9.0-mm donor lamella, using a 200-μm head for the former and a 300-μm head for the latter) was modified by adding a 6.5-mm incomplete full-thickness incision in the recipient bed before suturing the donor graft in place....