An alternative approach to carbon nanotube sample preparation for TEM investigation.

A two-stage replication technique (positive replica) is shown to be suitable for transmission electron microscopy (TEM) examination of carbon nanotubes (CNTs) and other one-dimensional nanostructures in their longitudinal direction. This method enables handling the fragile nanostructures, is fast and simple and allows to study the growth mechanism of nanofeatures, including the early stages of their growth. CNTs may also be examined when the growth layers are very thin, and even when only a few nanotubes are on a substrate.

[Treatment of conjunctival epithelial tumors: brachytherapy with ruthenium-106].

Introduction: Treatment of conjunctival epithelial tumors is not standardized because it is difficult to compare large series in this rare disease. Surgical excision is usual, but the recurrence rate has led several authors to propose alternative therapies.

Patients And Methods: During the past 20 years, brachytherapy using ophthalmic applicators has been developed and the results of different studies have confirmed the usefulness of this therapy.

[A case of primary non-Hodgkin lymphoma of the lacrimal sac].

Malignant tumors of the lacrimal sac are uncommon, and primary non-Hodgkin lymphomas are rare. We report the case of an 80-year-old woman presenting with epiphora and swelling of the left lacrimal area. A dacryocystorhinostomy was programmed, but within few weeks a painful tumor appeared with cervical nodes.

[Treatment of fractures of the orbital floor: reconstruction using Teflon sheets. Analysis of the results after 5 years].

We report our experience with fractures of the orbital floor over the past five years, reporting 80 cases. Different anatomic and clinical forms were defined, particularly trap-door fractures. After a clinical and computed tomography study, we recommend treatment with Teflon implants.