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Eight patients with agoraphobia and panic attacks as defined by DSMIII and 11 controls were included in this study which measured the circulating biogenic amine levels. The method of assay used a high performance liquid chromatograph with electrochemical detection. Measurement of dopamine, noradrenaline and adrenaline showed no differences between the groups. Levels of serotonin (5-HT) were significantly lower in the agoraphobic group. The authors discuss the implication of this finding.

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Absfrael-This paper reviews the environmental factors that affect optical cable designs. The main environmental factors of cuncern are fiber bending loss, hydrogen loss degradation, and stress corrosion. Each of these factors is examined with respect to the impact on optical cable design. Due ti) the limited field data available on environmental effects, it is necessary for cable designers to rely on theoretical analysis and laboratory test data; this has resulted in a conservative optical cable design philosophy. This situation should improve as mure field data becomes available.