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M A Moreno

Publications and source records attributed to M A Moreno.

80 records · Page 5Linked to original sources
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Delayed late component of visual global field power in probable Alzheimer's disease.

A substantial literature shows that late components of visual evoked potentials (VEPs) are delayed in at least some forms of dementia in the elderly. The late-component delay is selective in that earlier components are not affected. More recent work with better defined clinical groups suggests that the selective late-component delay may be characteristic of Alzheimer's disease (AD) rather than an inevitable feature of dementia in general. To overcome problems in traditional VEP component latency measurement the present study uses reference-free Global Field Power (GFP) analysis to more objectively define VEP components and finds that the GFP peak corresponding to the late P2 component of the flash VEP is delayed in a probable AD group but not in a demented unlikely AD group, relative to age-equivalent healthy controls. The late-component delay is again found to be selective in that the GFP peak corresponding to the earlier P1 component of the flash VEP does not differ between groups. These findings further strengthen the evidence for electrocortical changes in the visual system of AD patients.

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PubMedDate not supplied

Chloramphenicol extraction from milk by using the diphasic dialysis method followed by liquid chromatographic determination.

An economical, fast, and simple method for the extraction and liquid chromatographic determination of chloramphenicol (CAP) in milk is described. CAP is extracted by using a recently developed membrane-based method named "diphasic dialysis." CAP is detected and quantitated in the organic solvent used in dialysis without additional cleanup steps by reversed-phase liquid chromatography and UV detection (270 nm). The determination limit of CAP in milk was about 5 micrograms/L, although as little as 1 microgram/L could be detected under optimal working conditions.

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