Concentration of dopamine in plasma, activity of dopamine beta-hydroxylase in serum and urinary excretion of free catecholamines and vanillylmandelic acid in women chronically exposed to carbon disulphide.

The authors studied 140 women, selected at random, aged 22-55, divided into two groups. Group I (control) included 50 women, mean age 40.1 +/- 1.7 years. Group II included 90 women, mean age 39.7 +/- 2.1 years, chronically exposed to 15.6 - 21.84 mg/m3 of carbon disulphide from 0.5 to over 20 years. It was found that women chronically exposed to CS2 showed significantly lower levels of dopamine and lower activities of DBH (p < 0.001), significantly lower urinary excretion of adrenaline (p < 0.001), but insignificantly lower excretion of noradrenaline and vanillylmandelic acid.

The pattern of some lipid fractions in the serum of women chronically exposed to carbon disulfide.

The present study was performed in 307 women, aged 25 to 55 years (mean 42.7 +/- 4.7). The control group included 70 women, aged 42.1 +/- 3.5 years, who had previously had no contact with CS2. The study group included 237 women, age 42.9 +/- 5.1 years, chronically exposed to 5 to 7 ppm level of CS2, monitored daily using a spectrophotometric method. It was found that quantitative abnormalities in the lipid fractions of blood in women chronically exposed to CS2 appear after the age of 39 years. They were manifested by a significant increase in the serum levels of total cholesterol and LDL-Ch, and a decrease in HDL-Ch. No differences were noted as to the concentration of free fatty acids between both groups.

Isolate of Anaplasma marginale not transmitted by ticks.

The tick-borne transmissibility of 2 isolates of Anaplasma marginale was compared. Dermacentor variabilis were exposed to A marginale as nymphs by feeding on 1 of 4 splenectomized calves during periods of ascending parasitemia (maximum 49% to 81% parasitized erythrocytes) induced by injection of a stabilate. Tick-borne transmission was attempted, using 26 to 224 adult ticks within 30 to 220 days after molting. Adult D variabilis did not transmit an Illinois isolate of A marginale in 7 tick-borne transmission experiments (P = 0.0047), including 2 experiments in which calves were inoculated IV with homogenates of adult ticks. In contrast, a Virginia isolate of A marginale was readily transmitted by the same tick colony. Thus, previously reported morphologic and immunologic differences among A marginale isolates may extend to tick-borne transmissibility. The Virginia and Illinois A marginale isolates had an inclusion appendage that was not a marker for tick transmissibility.