Problem perception and problem regulation during online collaborative learning: what is important for successful collaboration?

Background: University students frequently prepare for exams or presentations in self-organized study groups. For this purpose, they often use videoconferencing software. During their collaboration, they need to regulate emerging problems to ensure effective learning.

Isolation of Equine rhinitis A virus from a horse semen sample.

Semen from an apparently healthy 4-year-old American Quarter Horse was submitted to the National Veterinary Services Laboratories for Equine arteritis virus isolation. Visual inspection of the semen sample upon arrival noted it was unusually yellow in color. The semen sample was inoculated onto cell monolayers, and cytopathic effect was observed 5 days postinoculation.

Asymmetry of basal ganglia perfusion in Tourette's syndrome shown by technetium-99m-HMPAO SPECT.

Unlabelled: Our study involved performing brain perfusion SPECT scans on Tourette's subjects to observe any common perfusion abnormalities involving the cerebral cortex or subcortical structures.

Method: Six patients with Tourette's syndrome and nine normal control subjects underwent a brain SPECT study with 99mTc-HMPAO. Regions of interest were generated over the cerebral cortex, basal ganglia, thalamus and cerebellum to evaluate any relative perfusion abnormalities or asymmetry in the Tourette's subjects.

Varicella-zoster virus DNA in CSF and arteries in delayed contralateral hemiplegia: evidence for viral invasion of cerebral arteries.

A 78-year-old woman presented with a right basal ganglia infarct 6 weeks after a left herpes zoster ophthalmicus. MR angiography showed focal segmental stenosis of the proximal segments of the anterior, middle, and posterior cerebral arteries. Varicella DNA was detected in the CSF by polymerase chain reaction (PCR).

School problems in Tourette's syndrome.

Background: A retrospective study of 138 children with Tourette's syndrome for associated school problems revealed that at the time of initial evaluation, 64 subjects (46%) experienced a school-related problem.

Objective: To survey a childhood population with Tourette's syndrome to explore the contributions of neurobehavioral concomitants to academic difficulties.

Results: A diagnosis of a specific learning disorder had previously been made in 30 (22%) of 138 children.