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. a process associated with “degrading” functional disorders or disease; 2. whereas “normal ageing” is a process in which the reduction in function is continuous but does not involve diseases or other pathological processes 3. and in “successful ageing

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Abstract  

In the 'normal' ageing brain a decrease in the cerebral metabolic rate has been determined across many brain regions. This study determines whether age differences would affect metabolic rates in regions and different hemispheres of the brain. The regional metabolic rate of glucose (rCMRGlu) was examined in a group of 72 subjects, ages 22 to 82 years, with 36 regions of interest chosen from both hemispheres of the cortex, midbrain and cerebellum. To determine metabolic rates the in-vivo technique of positron emission tomography (PET) was employed. Three age groups were chosen to compare hemispherical differences. In both young and intermediate age groups the left hemisphere had higher rCMRGlu values than those of the right for the majority of regions with, although less pronounced in the intermediate group. Importantly, the older age group displayed little difference between hemispheres.

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Abstract  

Thirteen brain regions were dissected from both hemispheres of fifteen ‘normal’ ageing subjects (8 females, 7 males) of mean age 79±7 years. Elemental compositions were determined by simultaneous application of particle induced X-ray emissions (PIXE) and Rutherford backscattering (RBS) analyses using a 2 MeV, 4nA proton beam scaned over 4 mm2 of the sample surface. Elemental concentrations were found to be dependent upon the brain region and hemisphere studied. Hierarchical cluster analysis was applied to group the brain regions according to the sample concentrations of eight elements. The resulting dendrogram is preseted and its clusters related to the sample compositions of grey and white matter.

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ostrosky-Solis, F., Jaime, R., Ardila, A. (1998) Memory abilities during normal aging. International Journal of Neuroscience, 1-2 , 151-162. Memory abilities during normal aging

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The discursive battlefield of agricultural biotechnology

Érvelési stratégiák és narratívák a hazai kutatói vitákban

Társadalomkutatás
Author: Réka Matolay

Funtowicz, S. O. — Ravetz, J. R. (1993): Science for the post-normal age. Futures , Vol. 25, No. 7, 739–755. Ravetz J. R. Science for the post-normal age

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-related brain potentials: Effects of normal aging on the scalp distribution of N1, P2, N2 and P300 latencies and amplitudes . Electroencephalography and Clinical Neurophysiology , 99 , 458 – 472 . 3

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30 545 549 Johnson, H. A.: Is aging physiological or pathological? In: Relations between normal aging and disease, Vol. 28. Ed

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780 Simonetti, S., Chen, X., DiMauro, S., Schon, E. A. (1992) Accumulation of deletions in human mitochondrial DNA during normal aging: analysis by quantitative PCR. Biochim. Biophys. Acta

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neurofibrillary tangles in subdivisions of the hippocampal cortex in normal ageing and Alzheimer's disease. Neurosci. Lett. 200 , 57-60. Neurons, intracellular and extracellular neurofibrillary tangles in subdivisions of the hippocampal

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Peters, A. (2002) The effects of normal aging on myelin and nerve fibers: a review. J. Neurocytol. 31 , 581–593. Peters A. The effects of normal aging on myelin and nerve fibers: a

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