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To map presynaptic cholinergic terminal densities in normal aging (n = 36), Alzheimer's disease (AD) (n = 22), and Parkinson's disease (PD) (n = 15), we performed single-photon emission computed tomography using [123I]iodobenzovesamicol (IBVM), an in vivo marker of the vesicular acetylcholine transporter. We used coregistered positron emission tomography(More)
UNLABELLED In the search for an in vivo marker of cholinergic neuronal integrity, we extended to human use the tracer (-)-5-[123I]iodobenzovesamicol (IBVM). METHODS IBVM, an analog of vesamicol that binds to the acetylcholine transporter on presynaptic vesicles, was prepared with specific activity greater than 1.11 x 10(9) MBq mmole-1. After intravenous(More)
This paper describes the use of Artificial Neural Networks (ANNs) for the short term prediction of maximum ozone concentrations in the East Austrian region. Various Multilayer Perceptron topologies (MLPs), Elman Networks (EN) and Modified Elman Networks (MEN) were tested. The individual models used ozone, temperature, cloud cover and wind data taken from(More)
Cerebral muscarinic cholinergic receptors were imaged and regionally quantified in vivo in humans with the use of [11C]scopolamine and positron emission tomography. Previous studies in experimental animals have suggested the utility of radiolabeled scopolamine for in vivo measurements, on the bases of its maintained pharmacologic specificity following(More)
The regional mouse brain distribution of a new carbon-11 labeled derivative of vesamicol, [11C]-5-(N-methylamino)benzovesamicol [( 11C]MABV) is reported. Radiotracer concentrations in vivo are in the rank order of striatum greater than cortex greater than hippocampus greater than hypothalamus greater than cerebellum, consistent with reported distributions(More)
Loss of cholinergic transmission in the cortex and hippocampus is a characteristic feature of Alzheimer's disease, and visualization of functional cholinergic synapses in the brain with PET could be a useful method for studying this degenerative condition in living humans. We investigated [18F]fluoroethoxybenzovesamicol, (-)-[18F](More)
Nerve growth factor is a peptide that supports the survival and differentiation of discrete neuronal populations in the peripheral and central nervous systems. NGF binds to both trkA, a tyrosine kinase receptor, and to the p75 nerve growth factor receptor, a protein lacking a consensus signalling sequence. We have identified a substituted(More)
Human gliomas were imaged in vivo using ligands for the peripheral-type benzodiazepine binding site (or omega 3 binding site) and positron emission tomography (PET). Although gliomas have a high density of the peripheral-type benzodiazepine binding site, PET scans with a selective ligand for this site, [11C] Ro5-4864, failed to demonstrate higher(More)