Assessment and Management of HIV-Associated Cognitive Impairment: Experience from a Multidisciplinary Memory Service for People Living with HIV.

As the HIV population ages, the prevalence of cognitive impairment (CI) is increasing, yet few services exist for the assessment and management of these individuals. Here we provide an initial description of a memory assessment service for people living with HIV and present data from a service evaluation undertaken in the clinic. We conducted an evaluation of the first 52 patients seen by the clinic.

Vocal fold paralysis: role of bilateral transverse cordotomy.

Objective: Although modern endoscopic laser techniques aim to avoid a permanent tracheostomy by augmenting the glottic aperture in cases of bilateral vocal fold palsy, loss of tissue from the posterior glottis risks compromising voice quality and swallowing function. The objective of this study was to describe our experience with bilateral transverse posterior cordotomy.

Methods: This was a retrospective analysis of functional outcomes in a series of consecutive patients undergoing a simple modification of the classical laser cordectomy procedure, which avoids tissue loss.

Effect of tube size on performance of a fixed-film tubular bioreactor for conversion of hydrogen sulfide to elemental sulfur.

A fixed-film continuous-flow photobioreactor was used for the removal of hydrogen sulfide from synthetic industrial wastewater and conversion of it to elemental sulfur using sixteen 150 mm length Tygon tubes as the active part of the reactor. Three different tube sizes (internal diameters (ID) 6.4, 3.

Biological conversion of hydrogen sulphide to elemental sulphur in a fixed-film continuous flow photo-reactor.

The green sulphur bacterium Chlorobium thiosulfutophilum was used to remove hydrogen sulphide from synthetic industrial wastewater and convert it to elemental sulphur in a fixed-film continuous-flow photosynthetic bioreactor. Twenty 150 mm x 3 mm ID Tygon tubes formed the active part of the reactor resulting in a total volume of 21.2 mL.

Extraction of elemental sulfur from an aqueous suspension for analysis by high-performance liquid chromatography.

A bioreactor is being developed that produces elemental sulfur suspended in aqueous bioreactor contents. The concentration of elemental sulfur must be measured explicitly in order to study the efficiency of the conversion of sulfide to elemental sulfur. Extracting the sample with ethanol gave erroneous results when sulfide was present in solution.

Laser beamsteering using the photorefractive effect.

A new configuration for laser beamsteering based on the photorefractive effect is presented. This method has the potential to produce several thousand beam positions, with a random access time of <1 msec. The method has a theoretical efficiency approaching 100%.

Multiple-order radial-grating shearing interferometer.

A shearing interferometer suitable for coherent phasing of multiple-aperture optical systems is described. The interferometer uses the properties of a rotating radial square wave grating to simplify interaperture phase measurements. A theoretical development and the results of experiments conducted at a wavelength of 10.

Digital beam switch for agile beam laser radar.

Experimental results achieved with a multiple-position random access switch for 10.6-microm radiation are described. The device uses cascaded Fabry-Perot interferometers to produce a 2-D array of beam positions with a wide field of view.