Webcasting videoconferences over IP: a synchronous communication experiment.

A multipoint videoconference was webcast live to an audience who could communicate with conference panelists and each other via chat. The videoconference, webcast, and chat were done entirely over the Internet. Seven panelists at four conference sites that had Internet2 connectivity and were located in different time zones within the continental United States discussed the topic of "Evaluating Health Professions Education and Information Resources on the Web.

The cerebral ventricles: a computer-based interactive tutorial.

The computer-based tutorial, "The Cerebral Ventricles," enables the user to review the anatomy, imaging, and common pathologic conditions of the human cerebral ventricular system. The program runs on a workstation that includes a laser videodisk player and a videodisk with 21,000 still images plus motion sequences. By using a mouse to select specific portions of the anatomic diagram depicting the ventricles, the user can review different planes of normal gross anatomy, corresponding computed tomographic and magnetic resonance images of normal anatomy, images of gross specimens of different pathologic entities, and corresponding radiologic images.

Animating the curriculum: integrating multimedia into teaching.

At many medical schools, the medical library assists faculty in finding and integrating new technology into the classroom, student laboratories, and lecture or small group sessions. Libraries also provide faculty with a place to do development. This paper recounts the author's experience creating software-based educational materials.

A chronic intracortical electrode array: preliminary results.

Two sets of electrode arrays made of either 25- or 50-microns-diameter Teflon-insulated platinum-iridium wire and Teflon have been developed for chronic intracortical electrical stimulation. Cortical histological studies were performed following acute and chronic implantation in cats. While some neural damage resulted from the implantations of either array configuration, a unique set of problems was associated with each diameter wire.

Brain abscess of odontogenic origin: report of case.

Advanced dental infection rarely causes brain abscess resulting in death. Good dental hygiene and removing abscessed teeth are advised for prevention of any such occurrence. An intercranial infection is described in a 29-year-old male who also had a dental phobia.

Autoradiographic evidence of [3H]SCH 23390 binding sites in human prefrontal cortex (Brodmann's area 9).

The distribution of dopamine D-1 receptors has been determined in human prefrontal cortex (Brodmann's area 9) by an in vitro light microscopic autoradiographic method. Dopamine D-1 receptors were localized by using [3H]SCH 23390 as a ligand. Our results indicated that [3H]SCH 23390 binding to slide-mounted tissue sections of human brain is specific, saturable, and of high affinity.

Intermittent exposure of rats to 2450 MHz microwaves at 2.5 mW cm2: behavioral and physiological effects.

Long-Evans male adult rats were intermittently exposed for 14 weeks to continuous wave (CW) 2450-MHz microwaves at an average power density of 2.5 mW/cm2. The mean specific absorption rate was 0.

Behavioral and physiological effects of chronic 2,450-MHz microwave irradiation of the rat at 0.5 mW/cm2.

Adult male Long-Evans rats were intermittently exposed to 2450 MHz CW microwaves at an average power density of 0.5 mW/cm2 for 90 days. The resulting SAR was 0.

Histopathological evaluation of materials implanted in the cerebral cortex.

Histopathological changes of the cerebral cortex in response to small, penetrating metal and non-metal implants were analyzed by means of light and electron microscopy. The needle-shaped implants were left in place during all stages of histological preparation and embedded in plastic together with the cortex. Changes of the brain-implant boundary were classified as non-reactive, reactive, or toxic, according to the reactive cellular constituents.

The reaction of the cerebral cortex to chronically implanted plastic needles.

Plastic (araldite) needles were implanted in the cerebral cortex in order to evaluate changes produced by an indwelling and relatively inert foreign body. The implants were removed together with surrounding cortex after 4-723 days and the implant-CNS boundary analyzed by light and electron microscopy. Three border conditions were observed at the surface of the implant and were related to the degree of implantation trauma.