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Biomedical subjects

V Schwartz

Publications and source records attributed to V Schwartz.

12 recordsLinked to original sources
PubMed2005

Preparation and comparison of supported gold nanocatalysts on anatase, brookite, rutile, and P25 polymorphs of TiO2 for catalytic oxidation of CO.

Nanosized anatase (< or = 10 nm), rutile (< or = 10 nm), and brookite (approximately 70 nm) titania particles have been successfully synthesized via sonication and hydrothermal methods. Gold was deposited with high dispersion onto the surfaces of anatase, rutile, brookite, and commercial titania (P25) supports through a deposition-precipitation (D-P) process. All catalysts were exposed to an identical sequence of treatment and measurements of catalytic CO oxidation activity. The as-synthesized catalysts have high activity with concomitant Au reduction upon exposure to the reactant stream. Mild reduction at 423 K produces comparably high activity catalysts for every support. Deactivation of the four catalysts was observed following a sequence of treatments at temperatures up to 573 K. The brookite-supported gold catalyst sustains the highest catalytic activity after all treatments. XRD and TEM results indicate that the gold particles supported on brookite are smaller than those on the other supports following the reaction and pretreatment sequences.

Journal Article↗
PubMed1993

Analysis of neuropsychological functioning in patients with chronic fatigue syndrome.

Memory impairment dominates the cognitive complaints of patients with chronic fatigue syndrome (CFS). Twenty CFS patients were available for studies with a clinical and experimental battery composed of memory and cognitive tests. The results on objective testing indicated that the CFS patients had some mild memory impairment, but only on tasks requiring conceptually driven encoding and retrieval processes. There were no associations between the nature of the precipitating illness, self ratings of fatigue, physical findings, or laboratory determination and objective memory performance or self report of memory functioning. These generally negative results indicate that memory impairment in CFS patients is typically mild and involves memory processes that participate in conceptualising information.

Adult↗
PubMed1993

Memory in patients with cerebellar degeneration.

Eleven patients with relatively selective cerebellar degeneration and 11 normal control subjects underwent a comprehensive neurologic and neuropsychological examination. The neuropsychological tests assessed general intellectual ability, different aspects of memory (effortful, automatic, and implicit memory processes), speed of information processing, and verbal fluency (using both category and letter fluency tasks). The results indicated that cerebellar patients were significantly impaired only on tasks requiring the use of executive functions, such as the initiation/perseveration subtest of the Mattis Dementia Rating Scale or the fluency tests, and on memory measures requiring greater processing effort. They performed normally on automatic and implicit measures of memory. Performance on the effortful memory and executive measures was not associated with neurologic variables or mood state. After controlling for the initiation/perseveration deficit, the effortful memory scores of the cerebellar patients were no longer different from those of controls. The present study suggests that memory in patients with relatively pure cerebellar dysfunction is only partially compromised and that the impairment is secondary to a deficit in executive functions.

Adult↗
PubMed1993

Respite care in a geriatric rehabilitation hospital: a support system for caregivers of disabled elderly.

Respite care is one of a wide range of services designed to help maintain the infirm elderly at home by reducing the burden on the caregiver. The availability and results of respite care may alter decisions to institutionalize an elderly relative. Fliman Hospital, a geriatric rehabilitation hospital in Haifa, provides short-term, inpatient care for bedridden frail or disabled elderly persons living in the community with the support of an informal network.

Aged↗
PubMed1979

Structure of the malB region in Escherichia coli K12. II. Genetic map of the malE,F,G operon.

Starting with a strain containing a malK-lacZ fusion, a series of lambda plaque-forming phages which carry varying amounts of the malE,F operon have been isolated. We have used these phages to construct a deletion map of the malE,F operon. The construction of this deletion map has led to the identification of a new gene, malG. The malG gene is located distal to malF. The malG gene product is a protein required for the active transport of maltose and maltodextrins.

Biological Transport↗
PubMed1977

Applications of nuclear medicine in ophthalmology.

Diagnostic techniques using radioactive isotopes can be used for the investigation of cerebral, orbital and intraocular tumours and for the dynamic study of tear flow. The value of such techniques in the study of obstruction of the nasolacrymal system (particularly partial and functional obstructions) has been established and the possibility of using Tc99m clearance for the investigation of dry eyes is being investigated.

Brain↗